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Correlation between air flow rate and pollutant concentrations during two-stage oak log combustion in a 25 KW residential boiler

Marek Juszczak

Chemical and Process Engineering | 2016 | vol. 37 | No 3 September | 419-428 | DOI: 10.1515/cpe-2016-0034

Keywords wood combustion pollutant emission heating boiler heat station

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Abstract

It can be expected that there is a considerable correlation between combustion air flow rate and the concentrations of carbon monoxide, hydrocarbons and nitrogen oxide in the flue gas. The influence of temperature and oxygen concentration in the combustion zone on the concentrations of carbon monoxide, hydrocarbons and nitrogen oxide in the flue gas, for high and low combustion air flow, was analysed. Oxygen concentration for which the concentration of carbon monoxide is the lowest was determined, as well as the mutual relation between carbon monoxide and nitrogen oxide concentration.

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Authors and Affiliations

Marek Juszczak

Mathematical model of the intensification of convective heat transfer in a bundle of smooth pipes using petal tubulators

Jiyenbeck Sugirov Bibigul Atshybayeva Marzhan Suimenova Kulanda Shaikhiyeva Gulbanu Yesbolay

Polityka Energetyczna - Energy Policy Journal | 2023 | vol. 26 | No 1 | 93-110

Keywords turbulence heat boilers increased heat transfer flow friction swirling flow

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Abstract

The relevance of this study is explained by the growing interest in increasing heat transfer by the development of high-performance thermal systems. Increasing the thermal characteristics of heat-exchanger systems is necessary for the efficient use of an energy source. The purpose of this study is to review the existing methods of heat-transfer intensification and examine the mathematical model of such an increase in efficiency when using petal turbulators. This study is based on a high-quality, reliable combination of proven theoretical methods (analysis, synthesis, concretization, generalization, modelling), and empirical methods. It is the introduction of turbulators into the flow channel that is one of the best methods of increasing passive heat exchange through such advantages as ease of manufacture and operation in combination with low operating and production costs. This study contains both passive and active methods of heat-exchange intensification that have been extensively investigated over the past decade. For this purpose, the newest studies of mainly authors from other countries were used, their detailed analysis was conducted and the results were summed up. In addition, a mathematical model of increasing the thermal efficiency of convective heating surfaces in a bundle of smooth pipes using petal turbulators was investigated, the results of which were tested on an experimental installation. The paper may interest a circle of readers interested in the problem of improving the thermal characteristics of heat exchangers, including researchers, teachers and students of higher educational institutions in the field of heat-power engineering.

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Authors and Affiliations

Jiyenbeck Sugirov

Bibigul Atshybayeva

Marzhan Suimenova

Kulanda Shaikhiyeva

Gulbanu Yesbolay

Department of Construction Engineering, Caspian University of Technology and Engineering named after Sh. Yessenov, Republic of Kazakhstan
Department of Energy and Transport, Caspian University of Technology and Engineering named after Sh. Yessenov, Republic of Kazakhstan

Combustion of wood pellets in a low-power multi-fuel automatically stoked heating boiler

Wiesław Zima Grzegorz Ojczyk

Archives of Thermodynamics | 2022 | vol. 43 | No 1 | 169-184 | DOI: 10.24425/ather.2022.140930

Keywords Multi-fuel heating boiler wood pellets Substitute fuel Thermal tests Boiler optimal operating points

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Abstract

This paper presents a test stand equipped, among others, with two boilers intended for the combustion of solid fuels. The first is a single-fuel boiler designed to burn wood pellets only. The second is a multi-fuel boiler intended for the combustion of mainly hard coal (basic fuel) with the grain size of 0.005–0.025 m. Wood pellets can also be fired in this boiler, which in such a case are treated as a substitute fuel. There is a developed and verified algorithm for the control of the multi-fuel boiler operation in a wide range of loads for the basic fuel. However, for the substitute fuel (wood pellets) there are no documented and confirmed results of such testing. The paper presents selected results of testing performed during the combustion of wood pellets in a multi-fuel automatically stoked boiler. Several measuring series were carried out, for which optimal operating conditions were indicated. These conditions may serve as the basis for the development of the boiler operation control algorithm. A detailed analysis was carried out of the flue gas temperatures obtained at the outlet of the boiler combustion chamber and of the contents of carbon monoxide and oxygen in the boiler flue gases.

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Bibliography

[1] Announcement of the Sejm Speaker of the Republic of Poland on the promulgation of a consolidated text of the Act on renewable energy sources. Journal of Laws – Republic of Poland (Dziennik Ustaw Rzeczypospolitej Polskiej) 2021, Item 610 (in Polish).
[2] Regulation of the Minister of Development and Finance on the requirements for solid-fuel boilers. Journal of Laws – Republic of Poland (Dziennik Ustaw Rzeczypospolitej Polskiej) 2017, Item 1690 (in Polish).
[3] EN 303-5:2021: Heating boilers – Part 5: Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW – Terminology, requirements, testing and marking.
[4] Poland’s Energy Policy until 2040. Ministry of Climate and the Environment, Appendix to Resolution 22/2021 of the Council of Ministers, 2021 (in Polish).
[5] Commission Regulation (EU) 2019/2146 amending Regulation (EC) 1099/2008 of the European Parliament and of the Council on energy statistics, as regards the implementation of updates for the annual, monthly and short-term monthly energy statistics. OJ L 325, 16.12.2019.
[6] Directive (EU) 2018/2001 of the European Parliament and of the Council on the promotion of the use of energy from renewable sources. OJ L 328, 21.12.2018.
[7] Zima W., Ojczyk G.: Current status and prospects for solid multi-fuel boilers of low power. Rynek Energii 5(2013), 108, 50–56 (in Polish).
[8] Juszczak M., Pałaszynska K., Rolirad K., Janicki M., Szczechowiak E.: Attempt to use additives increasing ash melting point while firing agricultural biomass pellets in order to avoid slag production in the furnace. Ciepłownictwo, Ogrzewnictwo, Wentylacja 48(2017), 8, 320–326 (in Polish).
[9] Ciupek B., Urbaniak R., Judt W.: Experimental research of changes in co, nox and pm concentrations in flue gases during combustion of wood pellets with wheat seeds. Ciepłownictwo, Ogrzewnictwo, Wentylacja 50(2019), 2, 56–61.
[10] Orłowska A., Sroka K.: Changes in legal regulations concerning supplying households with heat. Rynek Energii 140(2019), 1, 38–47.
[11] Zima W., Ojczyk G.: Analysis of combustion of wood pellets as a substitute fuel in a low-power boiler. Arch. Combust. 35(2015), 2, 117–130.
[12] Ziebik A., Stanek W.: Energy effciency – selected thermo-ecological problems. Arch. Thermodyn. 41(2020), 2, 277–299.
[13] https://www.herz-energie.at/pl/ (accessed 6 Sept. 2021).
[14] http://www.ogniwobiecz.com.pl/ (accessed 12 Sept. 2021).
[15] Ecological Safety Mark: Certificate 1035. Inst. Chem. Process. Coal, Zabrze 2009 (in Polish).
[16] https://www.keison.co.uk/ (accessed 17 Aug. 2021).
[17] Kuznetsov N.V., Mitor V.V., Dubovsky I.E., Karasina E.S. (Eds.): Thermal Calculation of Steam Boilers. Normative Method (2nd Edn.). Energia, Moscow 1973 (in Russian).
[18] Rutkowski Ł., Szczygieł I.: Calculation of the furnace exit gas temperature of stoker fired boilers. Arch. Thermodyn. 42(2021), 3, 3–24.

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Authors and Affiliations

Wiesław Zima

Grzegorz Ojczyk

Cracow University of Technology, Department of Energy, al. Jana Pawła II 37, 31-864 Kraków, Poland
MTHE Modern Technologies in Heating Engineering, Młynska-Boczna 7/2, 31-470 Kraków, Poland

The diversification of energy sources in Kazakhstan as a way to dampen the consequences of a predicted crisis

Aiganym Seidaliyeva Sherniyaz Kabdushev Saltanat Baipakbayeva Eldar Kopishev Ibragim Suleimenov

Polityka Energetyczna - Energy Policy Journal | 2024 | vol. 27 | No 1 | 173-188

Keywords energy crisis small-scale energy downshifting heating boiler renewable energy sources

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Abstract

It is shown that the predicted energy crisis in Kazakhstan makes the issue of small-scale energy and complementary civil society institutions more than relevant. This crisis, caused by the deterioration of heating networks built during the former USSR, can be more than large-scale, as evidenced by the events in the city of Ekibastuz, where a significant proportion of the population was left without heating in the winter of 2022/2023. It is proven that the development of small-scale power generation should be complex, i.e. in the foreseeable future, one should focus attention on a combination of renewable and traditional energy sources, which implies a gradual increase in the share of renewable energy. The expediency of using the concept of “energy freedom”, at least in relation to the Republic of Kazakhstan, is substantiated. It is shown that the goal of the development of small green energy should be precisely the achievement of energy freedom for households, oriented towards the institutions of civil society. This implies, inter alia, the development of a wide range of non-trivial technical solutions that provide, for example, direct heat generation without an intermediate stage of conversion into electrical current. A specific example is considered, demonstrating the adequacy of the proposed approach. It is also shown that the primary measures to ensure the energy freedom of households can be implemented even when using equipment available on the market. Specific calculations are presented which prove that the transition to decentralized heat supply is economically feasible using available equipment.

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Authors and Affiliations

Aiganym Seidaliyeva

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Sherniyaz Kabdushev

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Saltanat Baipakbayeva

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Eldar Kopishev

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Ibragim Suleimenov

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NJSC “Almaty University of Power Engineering and Telecommunications named after Gumarbek Daukeev”, Kazakhstan
International IT University, Kazakhstan
L.N. Gumilyov Eurasian National University, Kazakhstan
Academician of National Engineering Academy of RK, Kazakhstan

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Correlation between air flow rate and pollutant concentrations during two-stage oak log combustion in a 25 KW residential boiler

Abstract

Authors and Affiliations

Mathematical model of the intensification of convective heat transfer in a bundle of smooth pipes using petal tubulators

Abstract

Authors and Affiliations

Combustion of wood pellets in a low-power multi-fuel automatically stoked heating boiler

Abstract

Bibliography

Authors and Affiliations

The diversification of energy sources in Kazakhstan as a way to dampen the consequences of a predicted crisis

Abstract

Authors and Affiliations