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新安装的机组由于汽水系统的清洁度不能满足机组启动需要,有必要设置凝结水启动排污管。凝结水排污管布置有2种方式,即布置在除氧器水位调节阀之前的方案1或布置在该阀之后的方案2。从凝结水的排污效果、操作安全性及对机组回热系统热效率的影响3方面情况看,方案1与方案2相比,在炉前系统进行过酸洗的情况下,其排污效果基本一样;方案1的支管局部处会发生水锤,方案2的母管会发生水锤;方案1排出的凝结水没有加热,方案2排出的凝结水已进行过加热,方案2的热效率较差。
The newly installed unit due to the cleanliness of the steam system can not meet the start-up needs of the unit, it is necessary to set the condensate to start the sewage pipe. There are two ways in which the condensate blowdown pipes are arranged, that is, the first scheme disposed in front of the deaerator water level adjusting valve or the second scheme disposed behind the valve. From the viewpoints of the pollutant discharge of condensate, the safety of operation and the influence on the thermal efficiency of the heat recovery system of the unit, compared with Option 2, when the system of pickling is pickled, the sewage effect is basically the same; The water hammer occurs in the branch pipe of Scheme 1, and the water hammer occurs in the manifold of Scheme 2. The condensate discharged from Scheme 1 is not heated. The condensate discharged from Scheme 2 is already heated. The thermal efficiency of Scheme 2 is poor.