| Economic development has caused continuing growth of energy demand andpollutant emissions in the world. Unlike many other industrialized countries, the primaryenergy of China is coal. The total installed capacity of pulverized coal-fired power plantsis over700GW, which providing nearly80%of the gross electricity in China. Thesepower plants constitute almost half of the total CO2emission volume in the country.Therefore, pollutant reductions in pulverized coal-fired power plants will contributesignificantly to the worldwide effort in reducing pollutants.The investigation on an integrated renewable energy combined cycle system(IRECSS) has attracted many researches so far. The researches show that an IRECSSprovides a meaningful reference for energy conservation and emission reduction. It is anefficient way to promote the utilization of energy, adjust energy structure and reliefenergy conservation and emission reduction pressure.Firstly,300MW and600MW units were selected for instance in the present paper, amathematical model for thermal economic analysis was established when auxiliarysystem acting on the location of steam extraction in heaters. Energy-saving andemission-reduction potentials of CO2and coal cost-savings were investigated. Secondly,taking a300MW unit with a greater potential of energy conservation and emissionreduction for instance, based on exergy analysis of the Second Law of Thermodynamics,a matrix model of exergy loss was established. Energy conservation potentials of heaterswere analyzed to seek the most suitable acting position of auxiliary system, and thethermal performance of hybrid power generation system was investigated. Finally, basedon entropy analysis, two general matrix models were established when auxiliary systemacting on the location of water side in heaters. Emission-reduction potentials, such asCO2, SO2, NOx emission reductions were investigated. |
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