汽包式锅炉炉水含硅量变化的影响因素及暂态过程分析

Investigation of the Temporary Characteristics of the Silica Concentration of Boiler-water in Drum-boiler

对炉水含硅量随各种影响因素变化的规律进行分析 ,指出影响炉水含硅量的主要因素是给水的含硅量和锅炉的排污率 ,在不同压力等级的锅炉中 ,两者对炉水含硅量的影响程度有很大差别 ;若某一时刻锅炉的给水硅、给水量、排污量之中的任一指标或全部发生了变化 ,炉水硅将按照指数规律向新的平衡值过渡 ,过渡时间长达3～ 5h .

The effects of varions factors on the silica concentration of boiler water are analyzed. It is indicated that the silica concentration of boiler water mainly is determined by the silica concentration of feed water and the blow down ratio of boiler. At different pressure grade, the influence extent of the silica concentration of feed water and the blow down ration could be very different. If one or all of the factors, including the silica concentration of feed water, the feed water rate, the blow down rate is changed at a time, the silica concentration of boiler water will transit to a new value exponentially. The transition time could vary from 3 to 5 hours.