A novel adjusting method for improving gas turbine(GT)efficiency and surge margin(SM)under part-load conditions is proposed.This method adopts the inlet air heating technology,which uses the waste heat of low-grade heat source and the inlet guide vane(IGV)opening adjustment.Moreover,the regulation rules of the com-pressor inlet air temperature and the IGV opening are studied comprehensively to optimize GT performance.A model and calculation method for an equilibrium running line is adopted based on the characteristic curves of the compressor and turbine.The equilibrium running lines calculated through the calculation method involve three part-load conditions and three IGV openings with different inlet air temperatures.The results show that there is an optimal matching relationship between IGV opening and inlet air temperature.For the best GT performance of a given load,the IGV could be adjusted according to inlet air temperature.In addition,inlet air heating has a consider-able potential for the improvement of part-load perfor-mance of GT due to the increase in compressor efficiency,combustion efficiency,and turbine efficiency as well as turbine inlet temperature,when inlet air temperature is lower than the optimal value with different IGV openings.Further,when the IGV is in a full opening state and an optimal inlet air temperature is achieved by using the inlet air heating technology,GT efficiency and SM can be obviously higher than other IGVopenings.The IGV can be left unadjusted,even when the load is as low as 50％.These findings indicate that inlet air heating has a great potential to replace the IGV to regulate load because GT efficiency and SM can be remarkably improved,which is different from the traditional viewpoints.

Wei ZHU;Xiaodong REN;Xuesong LI;Chunwei GU;Zhitan LIU;Zhiyuan YAN;Hongfei ZHU;Tao ZHANG

Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Guodian Science and Technology Research Institute,Nanjing 210023,China

能源前沿

[1]Wei ZHU;Xiaodong REN;Xuesong LI;Chunwei GU;Zhitan LIU;Zhiyuan YAN;Hongfei ZHU;Tao ZHANG-.Improvement of part-load performance of gas turbine by adjusting compressor inlet air temperature and IGV opening)[J].能源前沿,2022(06):1000-1016

IGVopenings

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