热力发电2017，Vol.46Issue(5)：108-114,7.DOI:10.3969/j.issn.1002-3364.2017.05.108
超超临界1000MW机组脱硫废水零排放技术
Discussions on zero-discharge technology of desulfurization wastewater for ultra supercritical units
摘要
Abstract
Two types of existing zero-discharge technologies (pretreatment-conventional evaporation crystallization and pretreatment-membrane concentration-conventional evaporation crystallization) applied domestically were examined in the applications of wastewater of desulfurization processes.Combining with the characteristics of the actual waste water and flow patterns of a coal-fired power plant,the technical and economic pros and cons of these two processes were analyzed to explore a suitable zero-discharge technology for the desulfurization wastewater.The results showed that both of these two technologies have disadvantages,like high investment and operation cost,crystallization of mixed salts,and others.Improvement ideas and suggestions on the technical development of zero-discharge of desulfurization wastewater were provided.It suggests the suspended solids and calcium magnesium ions should be removed in the pretreatment process as the very first step,and then the sodium chlorides and sodium sulfates should be separated via nanofiltration-low temperature crystallization.The sodium chloride solution should be further concentrated through reverse osmosis combined with electrodialysis and finally the crystalline salts be recycled by crystallization and drying processes.关键词
超超临界机组/脱硫废水/零排放/工艺优化/预处理/深度浓缩/分盐/纳滤膜Key words
ultra supercritical unit/desulfurization wastewater/zero-discharge/process optimization/pretreatment/deep concentration/salt separation/nanofiltration membrane分类
资源环境引用本文复制引用
吴优福,刘捷,海玉琰,李小端,钟振成,熊日华,霍卫东,韩宝军,李永龙..超超临界1000MW机组脱硫废水零排放技术[J].热力发电,2017,46(5):108-114,7.基金项目
神华集团科技项目(ST930015SH05)Science and Technology Project of Shenhua Group (ST930015SH05) （ST930015SH05）
