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Abstract

Main energy conversion machinery used and to be used in cogeneration systems are schematically described. Some assets of the distributed generation are pointed out and small-scale cogeneration systems designed for energy units of distributed cogeneration are described.

In the small scale, turbines and bearings are a source of specific problems connected with securing stable rotor operation. Accepted has been two kinds of high speed micro-turbines of electric power about 3 KW with multistage axial and radial rotors supported on foil bearings. A concept which becomes more and more attractive takes into account a low-boiling agent, which is normally used in the thermal cycle of the micro-turbine, as the lubricating liquid in the bearings (so-called ORC based systems). Of some importance is the operation of these machines at a low noise emission level, sine being parts of the household equipment they could disturb the calm of the residents. The scope of the present article is limited to the discussion of dynamic characteristics of the selected design. The properties of the rotor combined with slide bearings (foil bearings in this particular case) were taken under investigation. A combination of this type is a certain novelty since a typical modal analysis of such objects refers to a rotor itself. Analysing the dynamic state of the "home" power plants requires qualitatively novel research tools.

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Authors and Affiliations

Jan Kiciński
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Abstract

The article attempts to identify environmental conditions for the development of cogeneration companies in Poland. The article systematizes knowledge about environmental regulations which concern this issue. Within the framework of identified environmental conditions, the authors characterize issues related to national legislation that regulates the operation of cogeneration companies, as well as the requirements resulting from European Union and national regulations in this matter. These regulations, directly and indirectly, affect the long-term future of cogeneration companies and the energy sector as a whole. Undoubtedly, in the current state of environmental regulations in force, the key change for a power company such as a cogeneration company is to meet the requirements for the emission of harmful substances. The change was introduced in 2016 as a result of more stringent emission limits and the adoption of the IED (Industrial Emissions Directive). The implementation of recommendations of the BAT (Best Available Techniques) Conclusions in 2017 additionally tightened the required limits. Undeniably, the key period for cogeneration companies will be 2021 as per the implementation of imposed harmful substances emission’s limits. The article comprehensively discusses the conditions that substantially affect the long-term growth of a cogeneration company and are crucial when making assumptions intended to address strategic development issues in the domestic fuel and power sector.

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Authors and Affiliations

Karol Stós
Jacek Kamiński
Marcin Malec
ORCID: ORCID
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Abstract

The paper presents the results of a simulative thermodynamic analysis of a multifuel CHP plant basing on the technological diagram of Avedøre 2. Calculations have been carried out for the operation of Avedøre 2 plant in the district heating mode. Several variants of simulation have been considered, determined by the choice of operation of the respective plants, viz. main boiler fired with natural gas, main and biomass boiler, main boiler and GT plant, joint operation of the main and biomass boiler and GT plant, main boiler (fired with heavy fuel oil or/and wood chips) and biomass boiler and GT plant. For each variants a diagram of iso-fuel curves has been developed, illustrating the variability of useful effects (power output and district heat) at various loads of the CHP steam part. In case of the variant in which the main boiler and GT are in operation with natural gas as fuel the exemplary energy indices were determined.

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Authors and Affiliations

Andrzej Ziębik
Damian Szegda
Bjørn Qvale
Brian Elmegaard
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Abstract

The paper presents results of a parametric analysis of a hightemperature nuclear-reactor cogeneration system. The aim was to investigate the power efficiency of the system generating heat for a high-temperature technological process and electricity in a Brayton cycle and additionally in organic Rankine cycles using R236ea and R1234ze as working fluids. The results of the analyses indicate that it is possible to combine a 100 MW high-temperature gas-cooled nuclear reactor with a technological process with the demand for heat ranging from 5 to 25 MW, where the required temperature of the process heat carrier is at the level of 650°C. Calculations were performed for various pressures of R236ea at the turbine inlet. The cogeneration system maximum power efficiency in the analysed cases ranges from ~35.5% to ~45.7% and the maximum share of the organic Rankine cycle systems in electric power totals from ~26.9% to ~30.8%. If such a system is used to produce electricity instead of conventional plants, carbon dioxide emissions can be reduced by about 216.03–147.42 kt/year depending on the demand for process heat, including the reduction achieved in the organic Rankine cycle systems by about 58.01–45.39 kt/year (in Poland).
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Authors and Affiliations

Julian Jędrzejewski
1
Małgorzata Hanuszkiewicz-Drapała
2

  1. Antea Polska S.A., Duleby 5, 40-833 Katowice, Poland
  2. Silesian University of Technology, Faculty of Energy and Environmental Engineering, Konarskiego 18, 44-100 Gliwice, Poland
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Abstract

This paper shall present and explain the key aspects related to the issue of combined heat and power generation (CHP – Combined Heat and Power or Cogeneration). The cooperation with the water treatment plant launched allowed a closer look at the described technology as well as allowed the analyses and survey. The survey on the efficacy of the selected components of the cogeneration system was based on two cogeneration units fuelled with biogas produced in the sewage fermentation.
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Authors and Affiliations

Karol Tucki
Michał Sikora
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Abstract

The paper is devoted to explication of one of the advantages of heat and electricity cogeneration, rarely considered in technical literature. Usually attention is paid to the fact that heat losses of the heat distribution network are less severe in the case of cogeneration of heat in comparison with its separate production. But this conclusion is also true in other cases when the internal consumption of heat is significant. In this paper it has been proved in the case of two examples concerning trigeneration technology with an absorption chiller cooperating with a combined heat and power (CHP) plant and CHP plant integrated with amine post-combustion CO2processing unit. In both considered cases it might be said that thanks to cogeneration we have to do with less severe consequences of significant demand of heat for internal purposes.

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Authors and Affiliations

Andrzej Ziębik
Paweł Gładysz
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Abstract

Straw-fired batch boilers, due to their relatively simple structure and low operating costs, are an excellent source of heat for a wide range of applications. A concept prototype of a cogeneration system with a straw-fired batch boiler was developed. The basic assumptions were based on the principles of the Rankine Cycle and the Organic Rankine Cycle systems with certain design modifications. Using the prototype design of a system that collects high-temperature heat from the boiler, studies were performed. The studies involved an analysis of the flue gas temperature distribution in the area of the oil exchanger, a comparison of the instantaneous power of the boiler’s water and oil circuits for different modes of operation, as well as an analysis of the flue gas. In the proposed system configuration where the electricity production supplements heat generation, the power in the oil circuit may be maintained at a constant level of approx. 20-30 kW. This is possible provided that an automatic fuel supply system is applied. Assuming that the efficiency of the electricity generation system is not less than 10%, it will be possible to generate 2-3 kW of electricity. This value will be sufficient, for an on-site operation of the boiler.

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Authors and Affiliations

Krzysztof Sornek
Mariusz Filipowicz
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Abstract

The paper presents the results of optimizing the coefficient of the share of cogeneration expressed by an empirical formula dedicated to designers, which will allow to determine the optimal value of the share of cogeneration in contemporary cogeneration systems with the thermal storages feeding the district heating systems. This formula bases on the algorithm of the choice of the optimal coefficient of the share of cogeneration in district heating systems with the thermal storage, taking into account additional benefits concerning the promotion of high-efficiency cogeneration and the decrease of the cost of CO2 emission thanks to cogeneration. The approach presented in this paper may be applicable both in combined heat and power (CHP) plants with back-pressure turbines and extraction-condensing turbines.
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Authors and Affiliations

Andrzej Ziębik
Paweł Gładysz
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Abstract

The implementation of micro scale combined heat and power systems is one of the ways to improve the energy security of consumers. In fact, there are many available large and medium scale cogeneration units, which operate according to the Rankine Cycle. Due to European Union demands in the field of using renewable energy sources and increasing energy efficiency result in the importance of additionally developing systems dedicated for use in residential buildings, farms, schools and other facilities. This paper shows the concept of introducing thermoelectric generators into typical wood stoves: steel plate wood stoves and accumulative wood stoves. Electricity generated in thermoelectric generators (there were studies on both three market available units and a prototypical unit developed by the authors) may be firstly consumed by the system (to power controller, actuators, fans, pumps, etc.). Additional power (if available) may be stored in batteries and then used to power home appliances (light, small electronics and others). It should be noted that commercially available thermoelectric generators are not matched for domestic heating devices – the main problems are connected with an insufficient heat flux transmitted from the stove to the hot side of the generator (caused e.g. by the non -homogeneous temperature distribution of the surface and bad contact between the stove and the generator) and inefficient cooling. To ensure the high efficiency of micro cogeneration systems, developing a dedicated construction both of the generator and the heat source is necessary.

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Authors and Affiliations

Krzysztof Sornek
Mariusz Filipowicz
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Abstract

The changes in the domestic solid fuel market (including forecasted increases in the fuel prices) and the growing requirements related to actual environmental standards, result in increased interest in renewable energy sources, such as biomass, wind and solar energy. These sources will allow to achieve reduction in the CO2 emission, and consequently – avoid environmental costs after 2020. Therefore, the development of distributed energy systems, based on the use of biomass boilers, gas boilers and high efficiency combined heat and power units, will enable the fulfillment of current standards in the field of energy efficiency and emission of pollutants to the atmosphere. It should be emphasized that the actions taken to reduce emissions (e.g. anti-smog act) will contribute to reducing coal consumption in the municipal and housing sector (households, agriculture and other customers) in favor of biomass and other renewable energy sources. The article reviews selected biomass technologies:

- fluidized, dust and grate boilers,

- straw-fired boilers,

- cogeneration systems powered by biomass,

- torrefaction and biomass carbonisation.

The mentioned technologies are characterized by a high potential of in the field of dynamic development and practical application in the coming years. Thus, they can improve difficult situation in the distributed energy sector with a capacity up to 50 MW.

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Authors and Affiliations

Tomasz Mirowski
Eugeniusz Mokrzycki
Mariusz Filipowicz
Krzysztof Sornek
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Abstract

The paper presents an analysis of energy and economic effectiveness of the combined heat and power (cogeneration) technologies fired with natural gas that may be deemed prospective for the Polish electric power system. The current state of the cogeneration technologies fired with natural gas in Poland is presented. Five cogeneration technologies fired with natural gas, prospective from the point of view of the Polish electric power system, were selected for the analysis. Namely, the paper discusses: gas-steam combined heat and power (CHP) unit with 3-pressure heat recovery generator (HRSG) and steam interstage reheat, gas-steam CHP unit with 2-pressure HRSG, gas-steam CHP unit with 1-pressure HRSG, gas CHP unit with small scale gas turbine, operating in a simple cycle and gas CHP unit with gas engine. The following quantities characterizing the energy effectiveness of the cogeneration technologies were selected for the analysis: electricity generation efficiency, heat generation efficiency, primary energy savings (PES) and CO2 unit emission. The economic effectiveness of particular technologies was determined based on unit electricity generation costs, discounted for 2019, including the costs of purchasing CO2 emission allowances. The results of calculations and analyses are presented in a table and on a figures.

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Authors and Affiliations

Bolesław Zaporowski
ORCID: ORCID
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Abstract

In this study the current legal and market conditions of waste management in Poland are analyzed. The main legal basis for changes in the national municipal waste management system and their impact on the market situation in the last few years have been determined. Additionally, the important function of the selective collection and the key role of the separation of raw material fractions in waste sorting plants constituting the basis for the operation of Regional Municipal Waste Processing (RMWP) plants was underlined. Furthermore, the possibilities of developing electricity production technology in low and medium power modules using waste gasification techniques were emphasized. The stream of plastic mixture from municipal waste sorting was identified as problematic in the context of effective material recovery. Tests were conducted on the morphology of this waste stream from two sorting plants. In line with the literature data and as part of the analytical work, the properties of the plastic waste stream designated for recycling and the energy properties of the post-recycling plastic mixture were estimated. Tests results showed that the calorific value of this mixture reached 31.8 MJ/kg, whereas, ash and chlorine content equaled 2.7% and 1.1% of dry mass, respectively. These parameters indicate that the mixture as a high-calorific fuel component may be a valuable addition to refuse-derived fuel (RDF) produced from the over-sieve fraction of municipal waste. Concurrently, as a result of the development of waste gasification technologies with a high share of electricity production in low-medium power range plants, it is possible to integrate them with plastic recycling and RMWP plants in the Polish national waste management system.

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Authors and Affiliations

Arkadiusz Primus
Czesława Rosik-Dulewska
ORCID: ORCID
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Abstract

In this article, a comparison of economic effectiveness of various heating systems dedicated to residential applications is presented: a natural gas-fueled micro-cogeneration (micro-combined heat and power – μCHP) unit based on a free-piston Stirling engine that generates additional electric energy; and three so-called classical heating systems based on: gas boiler, coal boiler, and a heat pump. Calculation includes covering the demand for electricity, which is purchased from the grid or produced in residential system. The presented analyses are partially based on an experimental investigation. The measurements of the heat pump system as well as those of the energy (electricity and heat) demand profiles in the analyzed building were conducted for a single-family house. The measurements of the μCHP unit were made using a laboratory stand prepared for simulating a variable heat demand. The overall efficiency of the μCHP was in the range of 88.6– 92.4%. The amounts of the produced/consumed energy (electricity, heat, and chemical energy of fuel) were determined. The consumption and the generation of electricity were settled on a daily basis. Operational costs of the heat pump system or coal boiler based heating system are lower comparing to the micro-cogeneration, however no support system for natural gas-based μCHP system is included.

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Authors and Affiliations

Wojciech Uchman
Leszek Remiorz
Janusz Kotowicz
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Abstract

The introduction highlights the technologies of converting the chemical energy of biomass and municipal waste into various forms of final energy (electricity, heat, cooling, new fuels) as important in the pursuit of a low-carbon economy, especially for energy and transport sector. The work continues to focus mainly on gasification as a process of energy valorization of the initial form of biomass or waste, which does not imply that other methods of biomass energy use are not considered or used. Furthermore, the article presents a general technological flowchart of gasification with a gas purification process developed by Investeko S.A. in the framework of Lifecogeneration.pl. In addition, selected properties of the municipal waste residual fraction are described, which are of key importance when selecting the technology for its energy recovery. Significant quality parameters were identified, which have a significant impact on the production and quality of syngas, hydrogen production and electricity generation capacity in SOFC cells. On the basis of the research on the waste stream, a preliminary qualitative assessment was made in the context of the possibility of using the waste gasification technology, syngas production with a significant share of hydrogen and in combination with the technology of energy production in oxide-ceramic SOFC cells. The article presents configurations of energy systems with a fuel cell, with particular emphasis on oxide fuel cells and their integration with waste gasification process. An important part of the content of the article is also the environmental protection requirements for the proposed solution.
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Bibliography

  1. Al-attab, K.A. & Zainal, Z.A. (2015). Externally fired gas turbine technology: A review. Applied Energy, 138, pp. 474–487, DOI: 10.1016/j.apenergy.2014.10.049
  2. Andersson, M., Yuan, J. & Sunden, B. (2010). Review on modeling development for multiscale chemical reactions coupled transport phenomena in solid oxide fuel cells. Applied Energy 87, pp. 1461–1476, DOI: 10.1016/j.apenergy.2009.11.013
  3. Regise, A., Muller, C., Schmid, M, Colomar, D., Ortloff, F., Sporl, R., Brisse, A. & Graf, F. (2019). Innovative power-to-gas plant concepts for upgrading of gasification bio-syngas through steam electrolysis and catalytic methanation. Energy Conversion and Management, 183, pp. 462–473. DOI: 10.1016/j.enconman.2018.12.101
  4. Bartela, Ł., Kotowicz, J. & Dubiel-Jurga, K. (2018). Investment risk for biomass integrated gasification combined heat and power unit with an internal combustion engine and a Stirling engine. Energy, 150, pp. 601 – 616. DOI: 10.1016/j.energy.2018.02.152
  5. Chmielniak, T. (2020). Energetyka wodorowa, s.378. PWN, Warszawa.
  6. Colpan, C. O., Hamdullahpur, F., Dincer, I. & Yoo, Y. (2010). Effect of gasification agent on the performance of solid oxide fuel cell and biomass gasification systems. I. J. of Hydrogen Energy, 35, pp. 5001 – 5009. DOI: 10.1016/j.ijhydene.2009.08.083
  7. Colpan , C.O. (2009). Thermal Modeling of Solid Oxide Fuel Cell Based Biomass Gasification Systems, Department of Mechanical and Aerospace Engineering Carleton University Ottawa, Ontario, Canada, (Thesis).
  8. Di Carlo, A., Borello, A. & Bocci, E. (2013). Process simulation of a hybrid SOFC/mGT and enriched air/steam fluidized bed gasifier power plant, I.J.of Hydrogen Energy, 38, pp. 5857-5874. DOI: 10.1016/j.ijhydene.2013.03.005
  9. Dong, L., Liu, H. & Riffat, S. (2009). Development of small-scale and micro-scale biomass fuelled CHP systems—a literature review. Appl Therm Eng, 29, pp.2119–26. DOI: 10.1016/j.applthermaleng.2008.12.004
  10. Integrated Emission Directive no. 2010/75/UE 24.11.2010.
  11. Fortunato B., Camporeale, S.M., Torresi, M. & Fornarelli, F. (2016). A Combined Power Plant Fueled by Syngas Produced in a Downdraft Gasifier, Proceedings of ASME Turbo Expo, GT2016-58159, V003T06A023. DOI: 10.1115/GT2016-58159
  12. Fryda, L., Panopoulos, K.D. & Kakaras, E. (2008). Integrated CHP with autothermal biomass gasification and SOFC–MGT. Energy Conversion and Management, 49, pp. 281–290. DOI: 10.1016/j.enconman.2007.06.013
  13. Götz, M., Lefebvre, J., Mörs, F., McDaniel Koch, A., Graf , F., Bajohr, S., Reimert,R. & Kolb, T., (2016). Renewable Power-to-Gas: A technological and economic review. Renewable Energy, 85, pp. 1371 – 1390. DOI: 10.1016/j.renene.2015.07.066
  14. Huang, Y., Wang, Y.D., Rezvani, S., McIlveen-Wright, D.R., Anderson, M., Mondol, J., Zacharopolous, A. & Hewitt, N. J. (2013). A techno-economic assessment of biomass fuelled trigeneration system integrated with organic Rankine cycle. Applied Thermal Engineering, 53, pp. 325 – 331. DOI: 10.1016/j.applthermaleng.2012.03.041
  15. Kupecki, J. (2018). Modelling, Design, Construction, and Operation of Power Generators with Solid Oxide Fuel Cells, s. 261. Springer.
  16. Kupecki, J. (2018). Selected problems of mathematical modeling of solid oxide fuel cell stacks during transient operation, p. 133. Wyd. Instytutu Technologii Eksploatacji, (in Polish)
  17. Kupecki, J., Skrzypkiewicz, M., Wierzbicki, M. & Stepien M. (2017). Experimental and numerical analysis of a serial connection of two SOFC stacks in a micro-CHP system fed by biogas. I.J. of Hydrogen Energy, 4, 2, pp. 3487 – 3497. DOI: 10.1016/j.ijhydene.2016.07.222
  18. Lian, Z.T., Chua, K.J. & Chou, S.K. (2010) A thermoeconomic analysis of biomass energy for trigeneration. Applied Energy, 87, pp. 84–95. DOI: 10.1016/j.apenergy.2009.07.003
  19. Maraver, D., Sin, A., Royo, J. & Sebastián, F. (2013). Assessment of CCHP systems based on biomass combustion for small-scale applications through a review of the technology and analysis of energy efficiency parameters. Applied Energy, 102, pp. 1303–1313. DOI: 10.1016/j.apenergy.2012.07.012
  20. Mathiesen, B.V., Lund, H., Connolly, D., Wenzel, H., Ostergaard, P.A., Moller, B., Nielsen, S., Ridjan, I., Karnoe, P., Sperling, K. & Hvelplund, F.K. (2015). Smart Energy Systems for coherent 100% renewable energy and transport solutions. Applied Energy, 145, pp. 139–154. DOI: 10.1016/j.apenergy.2015.01.075
  21. Mauro, A., Arpina, F., Massarotti, N. (2011). Three – dimensional simulation of heat and mass transport phenomena in planar SOFCs. I. J. of Hydrogen Energy, 36, pp. 10288 – 10301. DOI: 10.1016/j.ijhydene.2010.10.023
  22. Menon, V., Janardhanan, V.M., Tisher, S. & Deutschmann, O. (2012). A novel approach to model the transient behaviour of solid - oxide fuel cell stacks. J. of Power Sources, 214 pp. 227 – 238. DOI: 10.1016/j.jpowsour.2012.03.114
  23. Primus, A. & Rosik-Dulewska, C. (2018). Fuel potential of the over-sieve fraction of municipal waste and its role in the national model of waste management. Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN, 105, pp.121-134. DOI:10.24425/124382 (in Polish)
  24. Primus, A. & Rosik-Dulewska, C. (2019). Integration of energy and material recovery processes of municipal plastic waste into the national waste management system. Polityka Energetyczna Energy Policy Journal, 22, 4, pp. 129–140. DOI: 10.33223/epj/114741
  25. Puig-Arnavat, M, Bruno, J.C. & Coronas, A. (2014). Modeling of trigeneration configurations based on biomass gasification and comparison of performance. Applied Energ,y 114 pp. 845–856. DOI:10.1016/j.apenergy.2013.09.013
  26. Kempegowda, R.S., Assabumrungrat, S. & Laosiripojana, N. (2009). Integrated CHP System Efficiency Analysis of Air, Mixed Air- Steam And Steam Blown Biomass Gasification Fuelled SOFC, Proc.of the IASIED International Conf. Modelling, Simulation, and Indentification. October 12 -14, 2009, Beijing, China
  27. Nikdalila, R., Azad, |A.T., Saghir, M., Taweekun, J., Bakar, M.S.A., Reza, M.S. & Azad, A.K. (2020). A review on biomass derived syngas for SOFC based combined heat and power application. Renewable and Sustainable Energy Reviews, 119, 109560. DOI: 10.1016/j.rser.2019.109560
  28. Rasmussen, J.F.B. & Hagen, A. (2011). The effect of H2S on the performance of SOFCs using methane containing fuel. Fuel Cell, 10, pp. 1135 – 1142. HAL Id: hal-00576976
  29. Salehi A., Mousavi, S.M., Fasihfar, A. & Ravanbakhsh, M. (2019). Energy, exergy, and environmental (3E) assessments of an integrated molten carbonate fuel cell (MCFC), Stirling engine and organic Rankine cycle (ORC) cogeneration system fed by a biomass-fueled gasifier. I. J. of Hydrogen Energy, 44, pp. 31488-31505. DOI: 10.1016/j.ijhydene.2019.10.038
  30. Skorek J. & Kalina J. (2005). Gas cogeneration systems; Wydawnictwo Naukowo-Techniczne; Warszawa, 2005 r. (in Polish)
  31. Sipilä, K., Pursiheimo, E., Savola, T., Fogelholm, C.J., Keppo, I. & Pekka A. (2005). Small Scale Biomass CHP Plant and District Heating. Vtt Tiedotteita . Research Notes 2301, Valopaino Oy, Helsinki, 2005. http://www.vtt.fi/inf/pdf/tiedotteet/2005/T2301.pdf
  32. Ściążko, M. & Nowak, W. (2017). Municipal waste gasification technologies. Nowa Energia 1. technologie_zgazowania_odpadow_komunalnych_1.pdf (cire.pl)
  33. Thilak, N., Iniyan, R.S. & Goic, R. (2011). A review of renewable energy based cogeneration technologies. Renewable and Sustainable Energy Reviews, 15, pp. 3640–3648. DOI: 10.1016/j.rser.2011.06.003
  34. Uebbinga, M., Liisa, M., Rihko-Struckmanna, K. & Sundmachera, K. (2019). Exergetic assessment of CO2 methanation processes for the chemical storage of renewable energies. Applied Energy, 233–234, pp. 271–282. DOI: 10.1016/j.apenergy.2018.10.014
  35. Wielgosiński, G. (2020). Thermal waste conversion, Nowa Energia; Racibórz 2020 r. (in Polish)
  36. Wongchanapai, S., Iwai, H., Saito, M. & Yoshida, H. (2012). Performance evaluation of an integrated small-scale SOFC-biomass gasification power generation system. Journal of Power Sources, 216, pp. 314 – 322. DOI: 10.1016/j.jpowsour.2012.05.098
  37. Zhang W., Croiset, E., Douglas, P.L., Fowler, M.W & Entchev, E. (2005). Simulation of a tubular solid oxide fuel cells stack using Aspen PlusTM unit operation models. Energy Conversion and Management, 46, pp. 181 – 196. DOI: 10.1016/j.enconman.2004.03.002
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Authors and Affiliations

Arkadiusz Primus
1
Tadeusz Chmielniak
2
Czesława Rosik-Dulewska
3
ORCID: ORCID

  1. INVESTEKO S.A.
  2. Silesian University of Technology, Faculty of Energy and Environmental Engineering, Institute of Power Engineering and Turbomachinery, Poland
  3. Institute of Environmental Engineering, Polish Academy of Sciences, Poland
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Abstract

Thermal analysis of a heat and power plant with a high temperature gas cooled nuclear reactor is presented. The main aim of the considered system is to supply a technological process with the heat at suitably high temperature level. The considered unit is also used to produce electricity. The high temperature helium cooled nuclear reactor is the primary heat source in the system, which consists of: the reactor cooling cycle, the steam cycle and the gas heat pump cycle. Helium used as a carrier in the first cycle (classic Brayton cycle), which includes the reactor, delivers heat in a steam generator to produce superheated steam with required parameters of the intermediate cycle. The intermediate cycle is provided to transport energy from the reactor installation to the process installation requiring a high temperature heat. The distance between reactor and the process installation is assumed short and negligable, or alternatively equal to 1 km in the analysis. The system is also equipped with a high temperature argon heat pump to obtain the temperature level of a heat carrier required by a high temperature process. Thus, the steam of the intermediate cycle supplies a lower heat exchanger of the heat pump, a process heat exchanger at the medium temperature level and a classical steam turbine system (Rankine cycle). The main purpose of the research was to evaluate the effectiveness of the system considered and to assess whether such a three cycle cogeneration system is reasonable. Multivariant calculations have been carried out employing the developed mathematical model. The results have been presented in a form of the energy efficiency and exergy efficiency of the system as a function of the temperature drop in the high temperature process heat exchanger and the reactor pressure.
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Authors and Affiliations

Adam Fic
Jan Składzień
Michał Gabriel
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Abstract

The paper presents a modified algorithm for choosing the optimal coefficient of the share of cogeneration in district heating systems taking into account additional benefits concerning the promotion of highefficiency cogeneration and biomass cofiring. The optimal coefficient of the share of cogeneration depends first of all on the share of the heat required for preparing the hot tap water. The final result of investigations is an empirical equation describing the influence of the ratio of the heat flux for the production of hot tap water to the maximum flux for space heating and ventilation, as well as the share of chemical energy of biomass in the fuel mixture on the optimal value of the share of cogeneration in district heating systems. The approach presented in the paper may be applied both in back-pressure combined heat and power (CHP) plants and in extraction-condensing CHP plants.

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Authors and Affiliations

Andrzej Ziębik
Paweł Gładysz
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Abstract

Basing on the first and second law of thermodynamics the fundamental trends in the Polish energy policy are analysed, including the aspects of environmental protection. The thermodynamical improvement of real processes (reduction of exergy losses) is the main way leading to an improvement of the effectivity of energy consumption. If the exergy loss is economically not justified, we have to do with an error from the viewpoint of the second law analysis. The paper contains a thermodynamical analysis of the ratio of final and primary energy, as well as the analysis of the thermo-ecological cost and index of sustainable development concerning primary energy. Analyses of thermo-ecological costs concerning electricity and centralized heat production have been also carried out. The effect of increasing the share of high-efficiency cogeneration has been analyzed, too. Attention has been paid to an improved efficiency of the transmission and distribution of electricity, which is of special importance from the viewpoint of the second law analysis. The improvement of the energy effectivity in industry was analyzed on the example of physical recuperation, being of special importance from the point of view of exergy analysis.
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Authors and Affiliations

Andrzej Ziębik
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Abstract

The paper presents the results of energy and environmental evaluation of geothermal CHP plant. The variant of CHP plant based on Organic Rankine Cycle (ORC) has been taken into consideration as the most favorable for the geothermal conditions prevailing in Poland. The existing geothermal well located in the city of Konin in Greater Poland (Wielkopolska) voivodship has been chosen as the case study. The conceptual design of CHP plant has been proposed and evaluated from energy and environmental point of view. The non-renewable primary energy consumption has been chosen as energy performance criterion. In the case of environmental performance carbon dioxide emission has been taken as evaluation criterion. The analysis has been performed for different operating conditions and three working fluids. The best energy performance can be spotted for working fluid R123, for which the reduction varies between 15200 and 11900 MWh/a. The working fluid R134a has a worse energy performance, which allows for the reduction of fossil fuels energy consumption in the range of 15000 and 11700 MWh/a. The total reduction of CO2 emission is the highest for working fluid R123: 5300 to 4150 MgCO2/a, the medium one for working fluid R134a: 5200 to 4100 MgCO2/a and the lowest for working fluid R227: 5000 to 4050 MgCO2/a. It has been shown that the construction of geothermal CHP plants based on Organic Rankine Cycle can be reasonable solution in Polish conditions. It is important concerning the need of reduction of fossil fuels primary energy consumption and carbon dioxide emission.
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Bibliography

  1. Bao, J. & Zhao, L. (2013). A review of working fluid and expander selection for organic Rankine cycle. Renewable and Sustainable Energy Reviews, 24, pp. 325-342.
  2. Barbacki, A. & Pająk, L. (2017). Assessment of Possibilities of Electricity Production in Flash Geothermal System in Poland. Geomatics and Environmental Engineering. 11 (3), pp.17-29.
  3. Borsukiewicz-Gozdur, A. & Nowak, W. (2007). Comparative analysis of natural and synthetic refrigerants in application to low temperature Clausius-Rankine cycle. Energy, 32 (4), pp. 344-352.
  4. Dai, X. , Shi, L. & Qian, W. (2019). Thermal stability of hexamethyldisiloxane (MM) as a working fluid for organic Rankine cycle. International Journal of Energy Research, 43 (2), pp. 896– 899.
  5. Energy from renewable sources 2017, Statistics Poland 2019, Warsaw 2019.
  6. Energy Reports. Statistics Poland 2019, Warsaw 2018.
  7. Górecki W. (red). (2006). Atlas of geothermal resources of Mesozoic formations in the Polish Lowlands. AGH University of Science and Technology S. Staszica in Cracow, Cracow.
  8. Grabowska, W. (2019). Utilization of geothermal energy in co-generated heat and power production, Eng. Thesis, Poznan University of Technology, Poznań (in Polish).
  9. Guo, T., Wang, H. & Zhang, S. (2011). Comparative analysis of natural and conventional working fluids for use in transcritical Rankine cycle using low-temperature geothermal source. International Journal of Energy Research, 35 (6), pp. 530-544.
  10. Heberle, F. & Bruggemann, D. (2010). Exergy based fluid selection for a geothermal organic Rankine cycle for combined heat and power generation. Applied Thermal Engineering, 30 (11-12), pp. 1326-1332.www.geotermiakonin.pl/odwiert-geotermalny.html
  11. http://www.exergy-orc.com
  12. Jankowski, M., Borsukiewicz, A., Szopik-Depczyńska, K. & Ioppolo, G. (2019) Determination of an optimal pinch point temperature difference interval in ORC power plant using multi-objective approach. Journal of Cleaner Production, 217, pp. 798-807.
  13. Kępińska, B. (2019). Geothermal Energy Use – country Update for Poland, 2016-2018; European Geothermal Congress 2019, Den Haag, The Netherlands, 11-14 June 2019.
  14. Legal Act of the Republic of Poland issued by Minister of Infrastructure and Development, on the methodology of evaluation of energy performance of buildings and building parts, Pos. 376/2015.
  15. Liu, L., Zhu, T., Wang, T. & Gao, N. (2019). Experimental investigation on the effect of working fluid charge in a small-scale Organic Rankine Cycle under off-design conditions. Energy, 174, pp. 664-677.
  16. Madhawa, H.D., Golubovic, M., Worek, W.M. & Ikegami, Y. (2007). Optimum design criteria for an organic Rankine cycle using low-temperature geothermal heat sources. Energy, 32 (9), pp. 1698-1706.
  17. Mahmoudi, A., Fazli, M. & Morad, M.R. (2018). A recent review of waste heat recovery by Organic Rankine Cycle. Applied Thermal Engineering. 143, pp. 660-675.
  18. Michałowski, M. (2011). Environmentally-friendly use of geothermal energy in Poland. Journal of the Polish Mineral Engineering Society, July-December 2011, pp. 1-9.
  19. Nowak, W. & Borsukiewicz-Gozdur, A. (2011). ORC power stations as the solution of low temperature heat source utilization. Clean Energy, 2, pp.32-35.
  20. Quoilin, S., Van Den Broek, M., Declaye, S., Dewallef, P. & Lemort, V. (2013). Techno-economic survey of Organic Rankine Cycle (ORC) systems. Renewable and Sustainable Energy Reviews, 22, pp. 168-186.
  21. Rettig, A., Lagler, M., Lamare, T., Li, S., Mahadea, V., McCallion, S. & Chernushevich, J. (2011). Application of Organic Rankine Cycles (ORC). World Engineers' Convention 2011, Geneva 4-9 September.
  22. Saleh, B., Koglbauer, G., Wendland M. & Fischer, J. (2007). Working fluids for low-temperature organic Rankine cycles, Energy, 32, pp. 1210-1221.
  23. Sauret, E. & Rowlands, A. S. (2011). Candidate radial-inflow turbines and high-density working fluids for geothermal power systems. Energy, 36, pp. 4460– 4467.
  24. Wang, D., Ling, X., Peng, H., Liu, L. & Tao L. (2013). Efficiency and optimal performance evaluation of organic Rankine cycle for low grade west heat power generation., Energy, 50, pp. 342-355.
  25. Wang, S., Liu, C., Liu, L., Xu, X. & Zhang, C. (2019). Ecological cumulative exergy consumption analysis of organic Rankine cycle for waste heat power generation. Journal of Cleaner Production, 218, pp. 543-554.
  26. World Energy Outlook 2019, IEA Annual report, iea.org/countries.
  27. Zanellato, L., Astolfi, M., Serafino, A., Rizzi, D. & Macchi, E. (2017). Field performance evaluation of geothermal ORC power plants with a focus on radial outflow turbines. IV International Seminar on ORC Power Systems, ORC2017 13-15 September 2017, Milano, Italy, pp.1-8.
  28. Zhang, H., Guan, X., Ding, Y. & Liu, C. (2018). Emergy analysis of Organic Rankine Cycle (ORC) for waste heat power generation. Journal of Cleaner Production, 183, pp. 1207-1215
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Authors and Affiliations

Tomasz Maciej Mróz
1
ORCID: ORCID
Weronika Grabowska
1

  1. Poznań University of Technology, Poland
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Abstract

There were done simulations of fuels consumption in the system of electrical energy and heat production based on modernised GTD-350 turbine engine with the use of OGLST programme. In intention the system based on GTD-350 engine could be multifuel system which utilise post-fying vegetable oil, micronised biomass, sludge, RDF and fossil fuels as backup fuels. These fuels have broad spectrum of LHV fuel value from 6 (106 J·kg-1) (e.g. for sludge) to 46 (106 J·kg-1) (for a fuel equivalent with similar LHV as propan) and were simulations scope. Simulation results showed non linear dependence in the form of power function between unitary fuel mass consumption of simulated engine GTD-350 needed to production of 1 kWh electrical energy and LHV fuel value (106 J·kg-1). In this dependence a constant 14.648 found in simulations was multiplied by LHV raised to power –0.875. The R2 determination coefficient between data and determined function was 0.9985. Unitary fuel mass consumption varied from 2.911 (kg·10–3·W–1·h–1) for 6 (106 J·kg-1) LHV to 0.502 (kg·10–3·W–1·h–1) for 46 (106 J·kg-1) LHV. There was assumed 7,000 (h) work time per year and calculated fuels consumption for this time. Results varied from 4,311.19 (103 kg) for a fuel with 6 (106 J·kg-1) LHV to 743.46 (103 kg) for a fuel with 46 (106 J·kg-1) LHV. The system could use fuels mix and could be placed in containers and moved between biomass wastes storages placed in many different places located on rural areas or local communities.
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Authors and Affiliations

Marek Hryniewicz
1
ORCID: ORCID
Kamil Roman
1
ORCID: ORCID

  1. Institute of Technology and Life Sciences – National Research Institute, Falenty, Hrabska Av. 3, 09-090 Raszyn, Poland

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