1000 MW机组汽轮机缸效率热耗敏感性分析

Analysis of heat sensitivity of turbine cylinder efficiency in a 1000 MW unit

以某1000 MW汽轮机组为研究对象,根据给定设计参数,对机组建立变工况计算模型。以各工况输出功率不变为前提,对100%THA、90%THA、75%THA、60%THA、50%THA、40%THA和30%THA工况下汽轮机各缸效率的热耗敏感性进行分析,得到各缸效率对热耗影响的规律曲线。结果表明,随着负荷降低,高压缸的热耗敏感性增大,中、低压缸效率热耗敏感性变化较小;低压缸效率热耗敏感性较大,中压缸次之,高压缸最小。缸效率降低、主蒸汽流量增加,使总热耗增大的同时增加另外两缸的输出功率以保持输出功率。

With a certain 1000 MW unit as the object,according to the given design parameters,a variable operating condition calculation model is established for the unit.On the premise of constant output power under various working conditions,the heat consumption sensitivity of turbine cylinder efficiency under 100%THA,90%THA,75%THA,60%THA,50%THA,40%THA and 30%THA working conditions is analyzed.The effect regular curve of the cylinder efficiency on the heat consumption is obtained.The results show that the heat consumption sensitivity of high pressure cylinder increases with the decrease of load while the change of the medium and low pressure cylinder change little.The heat consumption sensitivity of low pressure cylinder efficiency is the largest,followed by the medium and high pressure cylinder.The cylinder efficiency decreases and the main steam flow increases,which increases the total heat consumption and the output power of the other two cylinders to maintain the output power.