A gas turbine heat-and-power cogeneration system in a heat supply plant was studied and compared comprehensively with a coal-fired and gas-fired cogeneration system. The performance evaluation played an important role in rationally utilizing cooling-heating-and-power (CHP) energy. Regarding the energy-saving property of the heating and power cogeneration system,when the gas-steam combined cycle power plant and the gas-fired boiler serve as a reference for comparison,the annually averaged energy-saving rate hits 8.9%. In a comparison of the operation economy,when the gas turbine system is compared with the coal-fired boiler system,a lump sum of RMB 460,000 yuan can be saved each year,and an amount of RMB 1.82 million yuan,saved annually in comparison with the gas-fired boiler system. In the meantime,the cost saving will increase with an increase of the kilowatt-hour price and decrease with an increase of the gas price. In addition,when the gas turbine system is compared with the coal-fired boiler one,the cost saving will increase with an increase of the coal price. As regards emissions,when the gas turbine-based cogeneration system is compared with the coal-fired and gas-fired boiler system,NOx emissions are not reduced remarkably,but other emissions are lowered conspicuously. The gas turbine system features a definite edge in comparison with the coal-fired and gas-fired boiler system and will enjoy bright prospects in case a rational design is ensured.
Journal of Engineering for Thermal Energy and Power
gas turbine,heat and power cogeneration,boiler,performance comparison