湿法烟气脱硫系统的脱汞性能及其副产品的汞释放特性

发布时间：2018-04-29 21:28

  本文选题：湿法烟气脱硫 + 石膏　； 参考：《华北电力大学》2014年硕士论文

【摘要】：随着湿法烟气脱硫系统（WFGD）在燃煤电厂中的普及，其副产品脱硫石膏也成为燃煤电厂的主要废弃物之一。利用湿法烟气脱硫系统协同脱除燃煤电厂烟气中的汞，同时避免其副产品中汞的二次释放具有很大意义。目前国内外对实际电厂的湿法烟气脱硫系统的脱汞性能有一定研究，但对其副产品的汞释放特性尚未有系统性的研究。 针对上述情况，本文对三个实际电厂的湿法烟气脱硫系统的进出口烟气汞进行了采样，使用了安大略水法（OHM）和吸附管法，分析了该系统对烟气总汞、气态单质汞、气态氧化汞的脱除效果，三个WFGD系统对烟气汞均有一定的脱除效果，其中对气态氧化汞有较好的脱除效果，由于脱硫浆液的还原作用，出口的气态单质汞可能会大于入口；采集了实际湿法烟气脱硫系统中浆液流程各处的样品并分析其中的汞含量，浆液中的汞主要富集在脱硫石膏中，而脱硫废水中汞含量较低；对从现场采集到的脱硫石膏进行不同方式的加热处理，脱硫石膏汞在升温过程中的主要受热释放范围是100℃~400℃，，且升温过程中石膏失重与石膏汞释放没有同步性，未经去离子水处理的石膏相比石膏滤渣在升高到同一温度时的汞释放率更大，通过特定温度下的汞释放率确定了各石膏样品中不同化学形态汞的比例；最后计算了脱硫石膏升温过程中汞释放的反应动力学参数。
[Abstract]:With the popularity of wet flue gas desulfurization system (WFGD) in coal-fired power plants, its by-product desulphurization gypsum has become one of the main wastes of coal-fired power plants. It is of great significance to use the wet flue gas desulfurization system to remove mercury from the flue gas of coal-fired power plants and to avoid the secondary release of mercury from its by-products. At present, there is some research on the mercury removal performance of the wet flue gas desulfurization system in power plants at home and abroad, but the mercury release characteristics of its by-products have not been systematically studied. In view of the above situation, the import and export mercury of the wet flue gas desulphurization system in three actual power plants was sampled. The Ontario water method OHM) and the adsorption tube method were used to analyze the effect of the system on the total mercury in the flue gas and the gaseous elemental mercury. The removal effect of gaseous mercury oxide, three WFGD systems have certain removal effect on flue gas mercury, among them, gas mercury oxide has a better removal effect, because of the reduction of desulfurization slurry, the gas state elemental mercury may be larger than the inlet. Samples and mercury contents in the slurry process of the actual wet flue gas desulfurization system are collected and analyzed. The mercury in the slurry is mainly concentrated in the desulfurized gypsum, but the mercury content in the desulfurization wastewater is relatively low. The heat treatment of desulphurized gypsum collected from site shows that the main heat release range of desulphurized gypsum mercury in the process of heating up is 100 鈩

本文编号：1821621