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Thermodynamic evaluation of CHP (combined heat and power) plants integrated with installations of coal gasification
 Author:
 Ziębik, Andrzej, Malik, Tomasz, Liszka, Marcin
 Source:
 Energy 2015 v.92 pp. 179188
 ISSN:
 03605442
 Subject:
 algorithms, carbon dioxide, coal, electricity, energy, fluidized beds, gasification, heat, heat pumps, mathematical models, natural gas, steam, wastes
 Abstract:
 Integration of a CHP steam plant with an installation of coal gasification and gas turbine leads to an IGCCCHP (integrated gasification combined cyclecombined heat and power). Two installations of coal gasification have been analyzed, i.e. pressurized entrained flow gasifier – case 1 and pressurized fluidized bed gasifier with CO2 recirculation – case 2. Basing on the results of mathematical modelling of an IGCCCHP plant, the algorithms of calculating typical energy indices have been derived. The following energy indices are considered, i.e. coefficient of heat performance and relative savings of chemical energy of fuels. The results of coefficients of heat performance are contained between 1.87 and 2.37. Values exceeding 1 are thermodynamically justified because the idea of cogeneration of heat and electricity based on combining cycles of the heat engine and heat pump the efficiency of which exceeds 1. Higher values concerning waste heat replace more thermodynamically effective sources of heat in CHP plants. Relative savings of the chemical energy of fuels are similar in both cases of IGCCCHP plants and are contained between the lower value of the CHP (combined heat and power) plants fuelled with coal and higher value of CHP plants fired with natural gas.
 Agid:
 6036627

http://dx.doi.org/10.1016/j.energy.2015.06.003