9F级燃气-蒸汽联合循环机组余热锅炉入口烟道优化

Optimization of Inlet Flue of Waste Heat Boiler in 9F Gas Steam Combined Cycle Unit

采用低位布置的燃气轮机,由于燃气轮机排气温度高,烟气流速快,流场局部十分紊乱,导致配套余热锅炉的入口烟道结构设计和炉膛内受热面结构设计面临更多的技术难点。对余热锅炉入口烟道采用标准k-ε双方程湍流模型建模,通过对入口烟道不同结构的对比分析得出最优的入口烟道结构形状。余热锅炉的入口烟道结构优化技术是首次应用于9FB燃机电厂中,并通过了性能试验检验,极大地提高了锅炉热效率。

For the gas turbine with low position layout,due to the high exhaust temperature,fast flue gas flow rate and local turbulence of flow field,the inlet flue structure design and furnace heating surface structure design of the supporting waste heat boiler are faced with more technical difficulties.In this paper,the standard k-εtwo equation turbulence model is used to model the inlet flue of waste heat boiler.Through the comparative analysis of different structures of the inlet flue,the optimal structure shape of the inlet flue is obtained.The inlet flue structure optimization technology of waste heat boiler is applied in 9fb gas turbine power plant for the first time,and has passed the performance test,which greatly improves the thermal efficiency of the boiler.