广州增城H级燃气-蒸汽联合循环机组供热抽汽点选择研究

  目的  针对大容量联合循环机组的中压供热蒸汽参数，找出最佳的抽汽供热方式。  方法  结合增城项目热负荷特点，对应用在燃气-蒸汽联合循环机组上的各种供热抽汽方案，在系统配置、初投资、负荷适应性、机组效率和发电出力等方面进行较详细的论述和分析。  结果  分析结果表明，相比热段抽汽方式和中压缸抽汽方式，冷段抽汽方式均具有更高的机组发电出力、发电效率和综合能源利用率，初投资也最低。  结论  冷段抽汽方式是一种参数匹配适应性更好、适应机组变工况运行能力更强、热经济性和初投资更优、更适合大容量联合循环机组的中压抽汽供热方式，该方案可供同类工程设计借鉴参考。

Research on Selection of Heating Extraction Point for H Class Gas-Steam Combined Cycle Unit in Zengcheng， Guangzhou

  Introduction  To find out the best extraction heating scheme according to the medium pressure heating steam parameters of large capacity combined cycle unit.  Method  Combined with the heat load characteristics of Zengcheng project， this paper discussed and analyzed in detail the system configuration， initial investment， load adaptability， unit efficiency and power output of various extraction heating schemes applied to gas steam combined cycle units.  Result  The analysis results showed that， compared with hot section extraction and IP cylinder extraction， cold section extraction has higher unit power generation output， power generation efficiency and comprehensive energy utilization， and the initial investment was the lowest.  Conclusion  Cold section steam extraction is a kind of medium pressure steam extraction heating scheme with better parameter matching adaptability， stronger ability to adapt to variable operating conditions of units， better thermal economy and initial investment， and more suitable for large capacity combined cycle units. This scheme can be used for reference for similar engineering designs.