太阳能辅助燃煤发电系统单耗模型及参数敏感性分析

SPECIFIC CONSUMPTION MODEL AND PARAMETRIC SENSITIVITY ANALYSIS OF SOLAR AIDED COAL-FIRED POWER GENERATION SYSTEM

为研究太阳能引入对燃煤发电系统热力性能的影响,从单耗分析理论出发,建立太阳能辅助燃煤发电系统的单耗模型,对单纯燃煤机组和不同集成方式下的太阳能辅助燃煤发电系统的燃料单耗及成本单耗进行对比分析。结果表明:太阳能替代1段抽汽的辅助发电系统的燃料单耗及成本单耗均最低,分别为284.27 g/k Wh和0.38$/k Wh。在此基础上,以单耗性能最优的集成方案为例,对太阳直射辐射强度(DNI)、集热面积、油水换热温差、煤炭价格、集热器价格等关键因素对辅助发电系统燃料单耗及成本单耗的影响进行分析。

In order to investigate the effect of introducing solar energy into coal-fired power unit on the thermal performance, the specific consumption model of solar aided coal-fired power generation system was built based on the Specific Consumption Theory （SCT）. The fuel and cost specific consumption of coal-fired power unit and solar aided coal- fired power generation system with different integration were comparatively analyzed. The results show that both fuel and cost specific consumption of solar aided coal-fired power generation system are the minimum when the solar energy replaces the first extraction steam among all the replacements, the values are 284.27 g/kWh and 0.38 yuan RMB/kWh, respectively. On this basis, the effect of uncertain factors such as direct normal irradiance （DNI）, solar collection area, temperate difference of thermal exchange between oil and water, coal price, solar collector price etc. on the fuel and cost specific consumption of solar aided coal-fired power generation system were discussed according to an integration scheme with the smallest specific consumptions.