大型燃煤循环流化床锅炉掺烧含盐废水的可行性研究  

Feasibility Analysis of Blending Saline Waste Water in a Large Coal Fired CFB Boiler

作　　者：史航[1] 吴玉新[1] 于广欣 熊亮[2] 宓林[1] 吕俊复[1] SHI Hang WU Yuxin YU Guangxin XIONG Liang MI Lin LYU Junfu(Department of Thermal Engineering, Tsinghua University, Beijing 100084, China China National Offshore Oil Corporation, Beijing 100028, China)

机构地区：[1]清华大学热能工程系,北京100084 [2]中海油研究总院,北京100028

出　　处：《锅炉技术》2017年第1期23-28,共6页Boiler Technology

基　　金：国家重点基础研究规划(973)项目(2012CB214900)

摘　　要：煤化工产业在中国能源的可持续利用中扮演着重要角色,但其会产生大量的含盐废水,其中包含难以降解且有毒的苯酚类物质,将浓缩的含盐污水喷入自备电站锅炉炉膛,能在高温燃烧环境中有效处理掉各类有机物,同时煤灰有效吸收碱金属,是含盐废水规模化处理的一种经济方式。对含盐废水中的结晶盐样品进行XRD及离子色谱检测,发现其NaCl含量超过结晶盐样品总质量的99%。为了防止含盐废水锅炉掺烧过程中碱金属带来的风险,针对含盐废水中钠盐等碱金属盐含量高的特点,对锅炉掺烧碱金属盐引起的沾污结渣及腐蚀风险进行机理分析,并在900℃条件下对煤灰吸收碱金属盐的特性进行研究,综合考虑沾污结渣及腐蚀风险,提出了一种计算不同浓度含盐污水最大处理量的计算方法。Coal chemical industry plays an important role in the sustainable utilization of energy in China, but a large amount of saline waste water, which contains hardly decomposed and toxic phenol compounds, will be generated. Spraying the concentrated waste water into coal-fired power plant boiler furnace can effectively get rid of all kinds of organic matter in the high temperature combustion environment, besides, the alkali salt in the waste water can be absorbed by coal ash, which makes it an economic way to process salt wastewater. In this paper, XRD and ion chromatography detection were conducted for the crystallized salt from sa- line waste water. The measurement shows that the 99% of the crystallized salt samples are NaCl. In order to reduce the risks caused by alkali metal when blending saline waste water to coal fired boiler and considering high content of alkali metal in saline waste water, the mechanism of fouling, slagging and corrosion risk caused by introduction of saline water were analyzed, and the absorption characteristics of the alkali by coal ash under 900 ℃ was experimentally investigated. Based on the fouling, slagging and corrosion risk, a method to calculate the maximum saline waste water treatment capacity was proposed.

关 键 词：含盐污水 碱金属盐 锅炉掺烧 沾污 腐蚀 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]