城市中水对湿法烟气脱硫工艺的影响

摘要

以湛江电力有限公司工业原水由地下水改为城市中水为例,分析和讨论了中水对湿法烟气脱硫工艺三方面的影响:①抑制吸收塔内CaCO3的转化及CaSO3·1/2H2O的氧化过程;②导致脱硫石膏Cl-含量和含水率升高,石膏品级降低.真空过滤不同Cl-含量的石膏浆液,发现随着石膏浆液Cl-含量的升高,过滤得到的石膏滤饼含水率升高,即Cl-的存在不利于石膏浆液的脱水;③Cl-含量升高加剧了脱硫系统中碳钢及不锈钢的腐蚀,特别是碳钢在高浓度Cl-溶液中会发生剧烈全面腐蚀.%Taking Zhanjiang Electric Power Co.,Ltd.whose industrial raw water switches from groundwater to recycled water as an example,analysis and discusses the influence of recycled water on wet flue gas desulfurization process:①inhibit the transformation of CaCO3 and the oxidation of CaSO3·1/2H2O in the absorption tower;②lead to the increasement of Cl-and water content of desulfurization gypsum.By filtrating different Cl-content of gypsum slurry,we found that with the increasement of Cl-content in gypsum slurry,the obtained gypsum filter cake has a higher water content,the presence of Cl-is not conducive to the dehydration of gypsum slurry;③Cl-aggravated the corrosion of carbon steel and stainless steel in the desulfurization system,especially,severe and comprehensive corrosion will occur to carbon steel in high Cl-concentration solution.