湿式石灰石烟气脱硫循环系统减阻剂配方研究

Research on Drag Reducing Agents Formula Applied to the Wet Limestone FGD System

高聚物聚氧化乙烯(polyethyleneoxide,PEO)、聚丙烯酰胺(polyacrylamide,PAM)能够减少管道中流体阻力。目前,电厂脱硫主要以湿式石灰石石膏法为主,脱硫系统中循环泵传输浆液产生巨大的阻力耗能。因此,文中针对电厂脱硫系统进行减阻实验研究。模拟实际环境中的生产情况,在湿式石灰石脱硫浆液中,添加不同浓度的减阻剂,研究浆液流体特性以及高聚物的减阻性能。基于影响高聚物PEO、PAM减阻效果的因素实验分析,探索最佳的减阻剂配方。研究表明,高聚物PEO、PAM均存在自最佳减阻浓度;减阻剂配方由PEO、PAM、硫脲3种组分按质量浓度配比3:1:2组成,600 mg/L减阻剂的减阻效果最佳,最佳减阻率在40%左右。

The polymer compounds, such as polyethyleneoxide （PEO）, polyacrylamide （PAM） are able to reduce the pipe fluid resistance. Nowadays, flue gas desulfurization in power plants mainly adopts the method of wet limestone/gypsum method; Circulation pump transporting circulation slurry causes large resistance, consuming a lot of energy in the desulfurization system. Therefore, the experimental research on resistance reduction for desulfurization system in power plants was carried out. To simulate actual environment in wet limestone desulfurization slurry, different concentrations of drag reducing agent （DRA） were added into the slurry, and flow properties of desulfurization slurry and resistance reduction performance of polymer were investigated at the same time. The best formula of DRA was obtained through the experimental analysis of influence factors upon drag-reduction performance of polymer PEO PAM. The study shows that DRA has the best resistance reduction effect at the optimum mass concentration ratio of PEO, PAM and thiourea of 3：1：2 and DRA concentration of 600 mg/L, and the best resistance reduction rate is about 40%.