Energy conservation and emission reduction potentials of renewable energy integrated with coal-fired power generation system

An integrated renewable energy combined cycle system provides an efficient way to adjust energy structure and relief energy conservation and emission reduction pressure. Taking a 300 MW unit for example, based on exergy analysis of the Second Law of Thermodynamics, a general matrix model was established when auxiliary system acting on the location of steam extraction in heaters. Energy conservation and emission reduction potentials, such as specific coal consumption, CO2, SO2, and NOx emission reductions were investigated. Results showed that the exergy losses of heaters are decreased after introducingauxiliary system. The hybrid power generation system achieves optimal economy when auxiliary system acts on the high pressure heaters. Thermal economic indexes reach maximum values under the condition of turbine extraction totally supplanted. The reduced specific coal consumption reaches 20.43 g/(kWh), emission reduction of CO2, carbon dust, SO2 and NOx reaches 82800 t/a, 22900 t/a, 2527.79 t/a and 1263.89 t/a, respectively. ©, 2015, Science Press. All right reserved.