不同容量和地区下光煤混合发电变工况性能研究

OFF-DESIGN PERFORMANCE OF SOLAR HYBRID COAL-FIRED POWER GENERRATION IN DIFFERENT CAPACITIES AND REGIONS

在构建系统集成模型的基础上,阐述光煤混合发电系统变工况性能计算方法。以3个地区和4种容量燃煤机组为例,研究集成模型、取代份额、辐射强度、地区和容量对光煤混合发电系统性能的影响规律。结果表明: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。

Based on the construction of the integrated model,the calculation method of the variable working condition performance of the solar hybrid coal-fired power generation system is expounded.Taking three regions and four capacity coal-fired units as examples,the effects of integration model,substitution share,radiation intensity,region and capacity on the performance of the solar hybrid coal-fired power generation system are studied.The results show that under certain circumstances of the unit and the region,the performance of the solar hybrid coal-fired 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 are the largest,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.