镇江发电厂600 MW超临界锅炉稳压冲管参数分析  

An Analysis of the Parameters of Stable-pressure Steam Purging for a 600 MW Supercritical Boiler at Zhen Jiang Power Plant

作　　者：陈志兵[1] 张海潮[1] 花茂来[1] 

机构地区：[1]江苏省电力试验研究院,江苏南京210036

出　　处：《热能动力工程》2005年第6期639-642,共4页Journal of Engineering for Thermal Energy and Power

摘　　要：镇江发电厂5号600 MW超临界直流锅炉稳压冲管分离器压力选择在5.0～5.5MPa.点火升压冲管时,在大气扩容式启动系统中,给水量从600 t/h上升到800 t/h,回收水量随分离器压力升高而很快下降.汽水膨胀期分离器水位可升至6 000 mm左右.过热器、再热器冲管系数分别为1.3和2.0以上,可达较好冲管效果.增加燃烧率和缓开临冲门可防止分离器水位大起大落.持续稳压冲管时分离器蒸汽过热度控制在20 ℃左右,利用减温水控制过热器和再热器出口温度,防止超过材料温限.The separator pressure of stable-pressure steam purging for a No.5 600 MW supercritical once-through boiler at Zhenjiang Power Plant has been selected at 5.0 MPa to 5.5 MPa.During the steam purging when pressure is boosted for ignition the feedwater flow rate in a startup system of the atmospheric flash-off type was raised from 600 t/h to 800 t/h.The recovered water flow rapidly diminished with a rise in the separator pressure.The water level of the separator at the time of vapor-water swelling might rise to about 6000 mm.The steam-purging factor of the superheater and reheater is respectively greater than 1.3 and 2.0,thus contributing to a relatively high steam-purging effectiveness.By increasing the combustion rate and slowly opening a temporary purging valve it is possible to prevent the drastic rise and lowering of the separator water level.During a sustained stable-pressure steam purging the steam superheating of the separator has been controlled at about 20℃.Desuperheating water was used to control the superheater and reheater outlet temperature,thereby preventing the materials from being subjected to an excessively high temperature.

关 键 词：大气扩容式启动系统 超临界直流锅炉 稳压冲管 

分 类 号：TK229.5[动力工程及工程热物理—动力机械及工程]