太阳能-燃煤机组热力系统耦合方式优化和碳减排分析

为了全面的评价耦合系统的生产性能，以某600 MW燃煤机组为研究对象，研究了太阳能-燃煤机组耦合系统。利用热力学和热经济学理论，建立了耦合系统的物理模型和热经济学模型，提出了耦合系统CO2减排量、投资节煤比、热经济学发电成本、〖HT5，5.SS〗火〖KG-*6〗用效率、〖HT5，5.SS〗火〖KG-*6〗用经济系数、煤耗等评价指标，确定了可行性耦合方案。结果表明，投资回收期最短的耦合方式为太阳能集热系统产生的蒸汽取代机组第1段抽汽，此时投资节煤比最高，为0.049 9 g/(kW·h·元)；热经济学发电成本最低、煤耗最少、污染物减排量最大的耦合方案为取代机组的第2段抽汽，该方案下热经济学发电成本为0.344 5 元/(kW·h)，煤耗相对于原机组降低了13.49 g/(kW·h)，CO2减排量为17.80 t/h。综合考虑，取代第2段抽汽为超临界600 MW机组耦合太阳能集热系统的可行性方案。

Optimization of a 600 MW supercritical solar-coal hybrid power plant and CO2 reduction analysis

In order to comprehensively evaluate the performance of the coupled system，a 600 MW coal fired power plant was investigated to study the performance of a solar-coal hybrid power plant.In conventional thermodynamic method，the production cost was neglected，however，a new method was developed to apply thermodynamics and thermoeconomics for comprehensively evaluating the performance of the hybrid system.The physical and thermoeconomic model of the hybrid system were established.The evaluation indexes of the hybrid system such as coal consumption，CO2 emission reduction，coal to cost ratio，energy efficiency，thermoeconomic generation cost and thermoeconomic coefficient were proposed，then the feasible coupling method of the solar-coal hybrid power plant was determined.The study results show that when the steam from the first extraction point is replaced by the steam from solar collector，the coal to cost ratio is the highest and it is 0.049 9 g/(kW·h·￥).The payback period of this coupling method is the shortest.The coupling method with the lowest thermoeconomic generation cost，coal consumption and the highest CO2 reduction is to replace the steam from the second extraction point with the steam from solar collector.The thermoeconomic generation cost，coal consumption reduction and CO2 emission reduction of the coupling method are 0.344 5 ￥/(kW·h)，13.49 g/(kW·h) and 17.80 t/h respectively.Therefore，the feasible coupling method of the solar-coal hybrid power plant is to replace the steam from the second extraction point with the steam from solar collector.