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 compressor 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 considerable potential for the improvement of part-load performance 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 IGV openings. 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.

提出了一种在部分负荷条件下提高燃气轮机（GT）效率和喘振裕度（SM）的新调整方法。该方法采用进气加热技术，利用低品位热源的余热和进气导叶（IGV）开度调节。此外，综合研究压气机进气温度和IGV开度的调节规律以优化GT性能。基于压气机和涡轮的特性曲线，采用了平衡运行线的模型和计算方法。通过计算方法计算出的平衡运行线涉及三个部分负荷工况和三个不同进气温度的IGV开口。结果表明，IGV开度与进气温度之间存在最优匹配关系。对于给定负载的最佳 GT 性能，可以根据入口空气温度调整 IGV。此外，当进气温度低于最佳值时，进气加热可提高压气机效率、燃烧效率和涡轮效率以及涡轮进气温度，因此在改善燃气轮机部分负荷性能方面具有相当大的潜力。不同 IGV 开口的价值。此外，当IGV处于全开状态，通过进气加热技术达到最佳进气温度时，GT效率和SM明显高于其他IGV开度。即使负载低至 50%，也可以不调整 IGV。