燃气轮机并网吹管的可行性分析

Feasibility Analysis of Paralleling in the Grid to Steam Blowpipe for Gas Turbine Units

当前燃气轮机机组吹管过程中,燃气轮机转速维持3000 r/min,蒸汽温度只有300℃左右,吹管效果差,且燃气成本高。蒸汽温度超过350℃时,氧化皮脱落剧烈,吹管效果好。在吹管期间,并网后发现燃气轮机排气温度明显提高,高压过热器出口蒸汽温度和再热器出口蒸汽温度也随之明显提高。在对比不同负荷下的燃气使用量,可以发现负荷越高其相应的成本反而越低。因此,新建燃气轮机机组在吹管期间,可以选择低负荷并网吹管,增强吹管效果的同时降低了成本,也缩短了工期。

In the current gas turbine unit pipe blowing process,the gas turbine maintains 3000 r/min,the steam temperature is only about 300℃,the blowing effect is poor and the cost is high.Oxide skin falls away when the steam temperature exceeds 350℃.Temperature of high-pressure superheater outlet steam and reheater outlet steam as exhaust gas temperature increase obviously after the paralleling in.In contrast to the amount of gas used under various loads,the higher the load but the lower costs.Therefore,the new gas turbine units during the blowpipe parallel in the grid with low loads can enhance effect while reducing costs,and shortening the construction period.