Discussion on evaluation of dechlorination effect for alkali liquor spray scrubber after BF dry dust-catch
CHEN Hui1，2， WANG Chang-shui3， WU Jian-long1，2， SUN Jian1，2，
LIANG Hai-long1，2， HUANG Jun-jie3
（1. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology， Beijing 100043， China； 2. Shougang Research Institute of Technology， Shougang Group Co.， Ltd.， Beijing 100043， China； 3. Ironmaking Department， Shougang Jingtang United Iron and Steel Co.， Ltd.， Tangshan 063200， Hebei， China）
Abstract：In recent years， dry de-dusting technology has been widely used. Alkali liquor spray scrubber was added after dry dust-catch process to removal such the corrosive medium as chlorine. However， the problem of corrosion cracking often occurred in the gas and hot blast pipes. The evaluating method was present through directly measuring the chlorine content in gas before and after alkali liquor spray scrubber. Compared to control PH value in alkali lye， the method above mentioned is more direct and reliable. The results show that the removal rate of chlorine in gas is between 10%-70%， and there is still the risk of corrosion of the equipment in the downstream process.
2019, Vol. 54 
