燃煤脱硫塔除雾器出口烟气浆液滴含量测定方法优化

Optimization of determination method for slurry droplets carried by coal-fired flue gas after demister

为准确测量燃煤脱硫系统除雾器出口的浆液滴含量,分析现有除雾器出口浆液滴含量测定方法的优劣,对国标测定方法进行优化,提出了一种新的可实现等速采样的浆液滴取样方法和简化的浆液滴浓度测定计算方法,并进行了对比试验。试验结果表明,本文提出的测量浆液滴浓度的取样方法,无需对捕集器进行干燥和称重即可计算得到浆液滴浓度,可简化操作步骤,减少测量误差;采用国标的浆液滴捕集法存在较大的逃逸率,1号机组国标浆液滴捕集法的浆液滴逃逸率为39. 84%,2号机组的浆液滴逃逸率为41. 41%,平均逃逸率40. 60%,本文提出的浆液滴取样分析方法可更精确地测量除雾器出口的净烟气携带的浆液滴含量。

In order to measure the slurry droplet content at the outlet of demister in desulfurization system more accurately,the advantages and disadvantages of determination method for slurry droplets at the outlet of demister were analyzed,and the national standard slurry droplet sampling method was optimized.An improved slurry droplets sampling method was proposed,which can realize equal-speed velocity sampling and is a simplified method for measuring and calculating the concentration of slurry droplets.Furthermore,comparative experiments were carried out.The experimental results show that there is a large escape rate in the national standard slurry droplet trapping method.Compared with the improved slurry droplet sampling method,the escape rates of the national standard slurry droplet sampling method are 39.84% and 41.41% in Unit 1 and 2 respectively,and the average escape rate is 40.6%.The improved slurry droplet sampling analysis method can measure the slurry droplets entrained by purified flue gas after the demister more accurately,and it can provide the basis for the performance evaluation of desulfurization system.