IGCC电厂水分级利用与零排放方案研究

针对国内首家IGCC电厂运行过程中存在的用排水流程不尽合理、煤气化与含硫废水处理难度大等问题，开展了水分级利用与零排放方案研究。通过系统分析诊断IGCC电厂用排水现状，尤其是废水处理系统的运行状况，提出了具体改造方案，主要内容有：（1）做好废水分类收集、分级使用工作，分别回收低盐和高盐废水；（2）根据不同废水水质特点，分别提出了生活污水、煤气化与含硫废水、化学制水系统反渗透浓水、末端废水处理工程改造方案，尤其是针对IGCC电厂特有的煤气化与含硫废水，提出了全新的处理工艺路线。按上述水分级利用与零排放方案改造，可使IGCC电厂实现废水零排放，单位发电量取水量由原来的1.51 m³/（MW·h）降低到1.01 m³/（MW·h）。

Study on Water Gradient Utilization and Zero Emission Technology in IGCC Power Plant

In the first IGCC power plant in China, there are some problems in the operation process such as the water drainage process is not reasonable and the coal gasification and sulfur containing wastewater is difficult to deal with. In view of these problems, this study proposes the water gradient utilization and zero emission scheme. Through the systematic analysis and diagnosis of the current situation of IGCC power plant's water utilization and drainage, especially the operation of the wastewater treatment system, a detailed update plan is proposed. The main contents are as follows:(1) Low-salt waste-water and high-salt wastewater should be collected and reused separately; (2) The update schemes of domestic sewage, coal gasification wastewater, chemical desalted water, and terminal waste water treatment are proposed separately. Especially for the special gasification and sulfur containing wastewater of the IGCC power plant, a new treatment process is proposed. Through the upgrade of the above water gradient utilization and zero emission scheme, the zero emission of the whole plant wastewater can be realized, and the water intake for unit power generation is reduced from 1.51m³/(MW h) to 1.01m³/(MW h).