湿法烟气脱硫喷淋塔的实验与反应模型研究

建立了石灰石/石膏湿法烟气脱硫喷淋塔实验台,实验研究了重要的操作参数对喷淋塔脱硫效率的影响规律。实验结果表明,提高液气比和浆液pH值、降低烟气温度和烟气速度、降低入口烟气的SO2浓度以及强制氧化均可以提高脱硫效率。将喷淋浆液分成喷淋液滴和塔壁液膜两种存在形式,并分别建模,喷淋液滴的脱硫过程采用Gerbec液滴脱硫模型计算,将塔壁液膜的流动分为层流和波动层流两种状态,发展出了新的喷淋塔脱硫反应模型。模型计算结果表明,相对于Gerbec液滴模型,本文的模型计算结果与实验数据吻合得更好。

A Study of Experimental and Reaction Models for the Spray Towers of Wet-method Flue-gas Desulfuration

Established was a spray-tower test stand for limestone/gypsum wet-method flue-gas desulfuration.An experimental study was performed of the mechanism governing the impact of important operating parameters on the desulfuration efficiency of a spray tower.The test results show that it is possible to raise the desulfuration efficiency by employing the following measures: raising liquid-gas ratio and slurry pH value,lowering the flue gas temperature and its flow speed,reducing SO2 concentration of the inlet flue gas and performing a forced oxidation.The spray slurry was divided into two existing forms: namely,spray liquid droplets and tower-wall liquid film.Models for them were respectively set up.The desulfuration process of the spray liquid droplets was calculated by using a Gerbec liquid-droplet desulfuration model.The flow of tower-wall liquid film was divided into two states,namely,laminar flow and undulatory laminar flow.A new reaction model for calculating desulfuration in the spray tower has been developed.The calculation results obtained by using the model show that relative to the Gerbec liquid-droplet model,the calculation results of the reaction model under discussion are in better agreement with the experimental data.