M701F机组检修停机后快速冷却策略分析

M701F机组是单轴联合循环燃气轮机组,在机组停机后冷却方面燃机主要采取了高盘冷却,汽机则是在停机过程中采用在低负荷条件下保持主汽调节阀一定开度用相对低温的蒸汽冷却汽轮机.尽管三菱采取了这样的冷却策略,每次检修停机后的结果是,燃机高盘冷却后燃机的温度已经降下来了,而汽机的温度仍然很高,燃机同汽机温度下降不匹配.提出了一种用加热的压缩空气进行汽机冷却的方法,从而缩短整个机组在停机后到停盘车的时间.

Quick cooling trategies for M701F units after maintenance outages

The M701F unit is a uniaxial combined cycle gas turbine unit.As for the cooling after unit maintenance outages,the combustion engine mainly adopts high speed barring gear cooling while the turbine keeps the main steam control valve with a certain opening under the condition of low loads and realizes cooling with relatively low temperature stream.Although Mitsubishi Heavy Industry used this cooling strategy,the results of maintenance outages were that the temperature of the combustion engine declined while the temperature of the turbine was still very high,which leaded to the mismatch of the temperature drop of the combustion engine and the turbine.A new cooling mehtod with heated compressed air is proposed for turbine cooling,by which the time from the outage of the whole unit to parking the barring gear will be shorten.