燃烧中低热值燃料时燃气轮机系统的应对方案及其性能分析

Adjustment Strategy and Performance Analysis of Gas Turbine System When Burning Medium and Low Heat Value Fuel

证明了燃料热值的降低,必将使燃料量增加;提出燃用中低热值燃料时燃气轮机系统工况点调整的理论依据,并给出5种调整方案,即:增加压气机的压比(方案1)、关小进口可调导叶(IGV)角度(方案2)、降低燃气轮机进口温度(方案3)、从压气机末级抽气(方案4)、增加燃气轮机的通流面积(方案5);计算了各调整方案对燃气轮机简单循环系统热经济性和安全性的影响。结果表明:对于焦炉煤气,方案1的热经济性最高,方案4的热经济性最低,各方案对燃气轮机的安全运行几乎没有影响;对于煤基合成气,方案5的热经济性最高,方案4的热经济性最低,方案1的安全性最差;综合考虑热经济性、安全性和可操作性,对于焦炉煤气,方案1是最佳方案,对于煤基合成气,方案2是最佳方案。

The conclusion that fuel flow would be increased as heat value of fuel was decreased was proved. Five strategies of adjusting gas turbine working condition when burning medium or low heat value fuel were brought forward, namely, increasing compressor pressure ratio, closing inlet guide vane （IGV）, decreasing extracting air from compressor turbine. The influence of each gas turbine inlet temperature, and increasing flow area of gas strategy on heat economy and safety operation of gas turbine simple cycle was discussed. The results show that, for coke oven gas, the heat economy of the first strategy is highest and the fourth is lowest, and each strategy has few influence on safety operation. For synthesis gas, the heat economy of the fifth strategy is highest and the fourth is lowest, and the safety of the first strategy is worst. Considering heat economy, safety and maneuverability, the first strategy is optimum for coke oven gas and the second strategy is optimum for synthesis gas.