水煤浆气化黑灰水系统降硬研究

摘要

In order to solve the problem of scaling and clogging of coal water slurry gasification black ash water system,the present status and processing mechanism of system were analyzed,and studies were carried out by simulating and a lab-scale device experiment.The treatment effects of two schemes of NaOH+CO2 and Ca(OH) 2 +Na2 CO3 were verified,and the dosage of reagent was checked.The technical guidance was provided for a field pilot test,and effective and feasible modification methods were found.The experimental results show that the two treatment schemes of NaOH+CO2 and Ca(OH)2 +Na2CO3 have good treatment effect.Two schemes both could reduce the hardness to less than 300 mg/L.This can meet the requirements of ash water reuse.The costs of NaOH+CO2 and Ca (OH)2+Na2CO3 schemes are 2.38 and 1.62 Yuan/t respectively.%为了解决水煤浆气化黑灰水系统结垢、堵塞问题,对系统现状、机理进行分析,通过模拟计算、搭建小试装置进行试验研究,验证了NaOH+CO2和Ca(OH)2 +Na2CO3两种方案处理效果,核算药剂用量,为现场中试试验提供技术指导,寻找有效可行的改造措施.试验得出NaOH+ CO2、Ca(OH)2+Na2CO3两种药剂方案处理效果良好,均可将硬度降低到300 mg/L以下,均能满足灰水回用要求.NaOH+CO2和Ca(OH)2 +Na2CO3方案药剂费用分别为2.38、1.62元/t.