TY - JOUR N2 - The purpose of this work is to find a correlation for heat transfer to walls in a 1296 t/h supercritical circulating fluidised bed (CFB) boiler. The effect of bed-to-wall heat transfer coefficient in a long active heat transfer surface was discussed, excluding the radiation component. Experiments for four different unit loads (i.e. 100% MCR, 80% MCR, 60% MCR and 40% MCR) were conducted at a constant excess air ratio and high level of bed pressure (ca. 6 kPa) in each test run. The empirical correlation of the heat transfer coefficient in a large-scale CFB boiler was mainly determined by two key operating parameters, suspension density and bed temperature. Furthermore, data processing was used in order to develop empirical correlation ranges between 3.05 to 5.35 m·s-1 for gas superficial velocity, 0.25 to 0.51 for the ratio of the secondary to the primary air, 1028 to 1137K for bed temperature inside the furnace chamber of a commercial CFB boiler, and 1.20 to 553 kg·m-3 for suspension density. The suspension density was specified on the base of pressure measurements inside the boiler’s combustion chamber using pressure sensors. Pressure measurements were collected at the measuring ports situated on the front wall of the combustion chamber. The obtained correlation of the heat transfer coefficient is in agreement with the data obtained from typical industrial CFB boilers. L1 - http://journals.pan.pl/Content/84951/PDF/04-paper.pdf L2 - http://journals.pan.pl/Content/84951 PY - 2014 IS - No 2 June EP - 204 DO - 10.2478/cpe-2014-0015 KW - heat transfer coefficient KW - suspension density KW - furnace temperature KW - circulating fluidised bed KW - supercritical CFB boiler KW - cluster renewal approach A1 - Nowak, Wojciech A1 - Błaszczuk, Artur A1 - Jagodzik, Szymon PB - Polish Academy of Sciences Committee of Chemical and Process Engineering DA - 2014 T1 - Bed-To-Wall Heat Transfer in a Supercritical Circulating Fluidised Bed Boiler SP - 191 UR - http://journals.pan.pl/dlibra/publication/edition/84951 T2 - Chemical and Process Engineering ER -