θ环填料塔中灰颗粒对K_2CO_3溶液吸收CO_2性能的影响

Influence of ash particle on CO_2 absorption performance using potassium carbonate in a θ-ring packed tower

为了解燃煤烟气中灰颗粒对化学吸收法脱除CO2性能的影响,选用典型的K2CO3溶液作为吸收剂,利用乱堆θ环小型填料塔,采用液相加入灰的方式,进行了实验研究.考察了吸收液温度、填料塔高度、液气比、灰颗粒浓度等工艺条件对灰作用的影响规律.结果表明,灰的存在使脱除CO2的效率降低,灰对脱除效率降低的影响与其化学成分关系不大,但与操作参数有关;随着吸收液温度或填料高度的增加,灰对CO2脱除效率的影响减弱;随着液气比的增加,灰对CO2脱除效率的影响有上升的趋势;随着灰颗粒浓度的增大,灰对CO2脱除效率的影响逐渐增大,最后趋于稳定.分析表明,对灰的影响主要是通过改变吸收液初始分布而实现的.

To understand the influence of the ash particles in the flue gas generated from coal combustion on the absorption performance of CO2 by the chemical absorption method,the typical K2CO3 solution was employed as the absorbent,and experiments were carried out by using a small packed absorber filled with θ-ring packing and introducing the ash from the liquid phase. The effects laws of the process conditions,including the absorption liquid temperature,the packing height,the liquidgas ratio and the concentration of the ash particles,on the ash action were studied. The results showthat the existence of the ash can reduce CO2 removal efficiency. The effect of the ash on the removal efficiency is not related to its chemical composition but to the operation parameters. With the increase of the absorption liquid temperature or the packing height,this effect is weakened. With the increase of the liquid-gas ratio,this effect has a tendency to rise. With the increase of the concentration of the ash particles,this effect increases gradually and finally tends to be stable. Therefore,the influence of the ash can be achieved by changing the initial distribution of the absorption liquid.