针对C5 0型汽轮机组冷态全压启动时 ,临近并机转速或并机后 ,经常出现下缸温升快于上缸 ,造成上下缸温差大的问题 ,经过综合分析 ,并多方面查找原因 ,认为低压加热器随机启动 ,各个抽汽口的导流作用加强了下汽缸的传热 ,使下汽缸温升加快是造成缸温差异常的主要原因。在机组启动的实践中采用了改变圆周进汽、适当延长高速暖机时间、推迟低加的投入等办法 ,通过这些优化运行操作措施达到了有效控制温差的目的 ,实际表明效果非常理想 For C5 0 turbine cold total pressure start, adjacent to the parallel speed or machine, often appear lower cylinder temperature rise faster than the upper cylinder, resulting in a large temperature difference between the upper and lower cylinder, after a comprehensive analysis and find out the reasons in many ways , That low-pressure heater random start, the diversion of each steam outlet enhances the heat transfer of the lower cylinder, so that the next cylinder temperature rise is the main reason for the abnormal cylinder temperature difference. The practice of starting the unit used to change the circumference of the steam, the appropriate extension of high-speed warm-up time, postponed the addition of low-cost approach, through these optimized operation measures to achieve the purpose of effectively controlling the temperature difference, the actual results show that the effect is ideal