国内典型光煤混合发电集成系统的变工况性能研究

Off-design performance study of typical solar hybrid coal-fired power generation system in China

以哈尔滨、呼和浩特、拉萨三个地区和四种容量分别为125MW、200MW、300MW、600MW燃煤机组为例,应用热力系统变工况计算方法,研究分析了集成模型、取代份额、辐射强度、机组容量和地域对光煤混合发电系统性能的影响规律。结果表明:在机组容量和地区一定的情况下,全部取代1级抽汽且辐射强度最大时的系统节能效果最优;同机组不同地区开展混合发电时,太阳能资源丰富地区的集热场面积最小,集热场换热效率和太阳能热电转换效率最大,年累计节能减排量大,静态投资回收期最短;同地区不同容量机组开展混合发电时,大容量机组年平均太阳能热电转换效率和年累计节能减排量最大,静态投资回收期最短。研究结果为光煤混合发电系统初设与改造提供了技术支持和科研参考。

Harbin,Hohhot,Lhasa and 125 MW,200 MW,300 MW,600 MW four-capacity coal-fired units are takenas an example,and based on the calculation method of thermal system variable working condition,the influences of integrated model,substitution share,radiation intensity,different areas of the same capacity and different capacities in the same area on the performance of solar hybrid coal-fired generation system are studied and analyzed.The results show that:Under certain circumstances of the unit and the region,the performance of the solar hybrid coalfired power generation system with 100%replacement of the first-stage extraction and the highest radiation intensity is optimal.When the same unit is used to carry out solar hybrid coal-fired power generation in different regions,the solar energy collection area is the smallest,the collector thermal efficiency and solar thermal power conversion efficiency is the largest.And the annual cumulative energy conservation and emission reduction is large,and the static investment recovery period is the shortest.When different capacity units in the same region carry out solar hybrid coal-fired power generation,the annual average solar to power conversion efficiency and annual cumulative energy conservation and emission reduction of the large capacity units are the largest,and the static investment recovery period is the shortest.The evaluation calculation and results provide technical support and scientific research reference for the preliminary design and transformation of the solar hybrid coal-fired power generation system.