中国电机工程学报2018，Vol.38Issue(9)：2657-2664,8.DOI:10.13334/j.0258-8013.pcsee.171008
燃煤烟气脱氯实现脱硫废水零排放技术及其影响
The Technology of Coal-fired Flue Gas Dechlorination for Realizing Zero-discharge of Desulfurization Wastewater and Its Influences on Boiler
摘要
Abstract
The zero-discharge of desulfurization wastewater has become a hot environmental issue. Coal-fired flue gas dechlorination is a new technology to achieve zero-discharge of desulfurization wastewater. The atomized alkaline solution is sprayed into the flue before the precipitator to absorb strong acid gases such as HCl. Then the reaction products will be removed with fly ash by precipitator synergistically. By reducing the mass concentration of Cl-in the flue gas at the inlet of the desulfurization tower, the amount of desulfurization wastewater can be reduced effectively. While the desulfurization wastewater after reduction being used as the solvent of alkaline, zero-discharge of desulfurization wastewater will be realized finally. When NaOH is used as the alkaline substance, and the Na/Cl(in mole) is about 5, the efficiency of dechlorination could reach more than 70％. The amount of desulfurization waste water of a 300MW unit can be reduced from 3. 1m3/h to 0. 88m3/h. In addition, the technology will not only remove HCl, but also can remove SO2and SO3in the flue gas. It has great significance for the prevention of low temperature corrosion, especially under the case of ultra-low emission. It also has certain positive significance for the operation of ESP and WFGD. Compared to other technologies of processing desulfurization wastewater, coal-fired flue gas dechlorination technology has the advantages of simple system, low cost, good security, strong adaptability, no secondary pollution and so on. It has a good application prospect.关键词
脱硫废水零排放/烟气脱氯/HCl/SO3/经济性/安全性Key words
zero-discharge of desulfurization wastewater/coal-fired flue gas dechlorination/HCl/SO3/economy/safety分类
资源环境引用本文复制引用
杨建国,耿梓文,袁伟中,陈锡炯,滕卫明,刘畅,赵虹..燃煤烟气脱氯实现脱硫废水零排放技术及其影响[J].中国电机工程学报,2018,38(9):2657-2664,8.基金项目
浙江省自然科学基金项目(LY15E060002).Project Supported by the Zhejiang Provincial Natural Science Foundation of China( LY15E060002). （LY15E060002）
