锅炉单独滑参数停运快速冷却理论基础及应用

Quick cooling theory in sliding parameter outage of boiler and its application

为解决锅炉停炉后的快速冷却问题,根据多年的现场实践和理论研究,介绍一种"锅炉单独滑参数停运快速冷却技术",可大大缩短锅炉停运后的冷却时间。该技术依据水分子在一定压力下对应一定饱和温度的基础理论,在汽轮机停运后利用一、二级旁路系统对锅炉进行单独滑参数停运,利用较低参数的汽、水循环达到对锅炉进行均匀冷却的目的。该技术经过在不同容量机组的试验,在保证汽包上下壁温差不超标的前提下,从发电机组停运到锅炉降压放水完毕具备检修条件仅需4h;根据锅炉容量不同可缩短锅炉冷却时间26h以上,其经济效益十分显著。

To solve the quick cooling problem after the shutdown of boiler, the quick cooling technology in sliding parameter outage was introduced, and it can reduce the cooling time of boiler greatly. This technology was deduced from the corresponding relationship between water pressure and saturated temperature. After the steam turbine stops, the first and second bypass system can be used for the sliding parameter shut-down of boiler and cooling boiler with low-parameter steam and water circulation evenly. This technology has been evaluated and tested on certain units with different capacity, and it took boiler only 4 hours from the stopping of generator to preparing for maintenance, keep the temperature difference between the upper and lower side of drum within ＇allowable range. It shows significant economic benefits by reducing boiler＇s cooling time by more than 26 hours depending on the capacity.