燃煤锅炉烟气循环脱硫技术

FLUE GAS CIRCULATION DESUL-FURIZATION TECHNOLOGY FOR COAL-FIRED BOILERS

目前我国以煤炭作为主要能源,主要应用于供热与发电等领域,煤炭使用过程中,烟气中的SO_(2)势必给环境造成一定的污染,迫使烟气脱硫技术迅速发展。常采用的烟气脱硫工艺主要为湿法脱硫、干法脱硫和半干法脱硫3类,各有一定的弊端,基于此开发了烟气循环脱硫及回收技术。与传统脱硫工艺相比,该工艺产生的副产品具有一定的价值,且脱硫剂可以循环使用,能够大幅度降低其用量。通过对循环脱硫技术的原理以及难点分析,确定了该技术的关键参数,即温度与CO_(2)的浓度对循环脱硫技术中脱硫剂的吸附和解析具有较大影响。通过计算机技术,采用咪唑基离子液作为脱硫剂,对SO_(2)循环脱硫及回收技术进行了模拟及验证,在23℃下,咪唑基离子液脱硫剂对混合气体中CO_(2)和SO_(2)的吸收摩尔比平均为1∶18.3,在108℃的解析条件下,混合气体中CO_(2)和SO_(2)的吸收摩尔比平均为1∶17.8。通过模拟数据分析,证明了咪唑基离子液作为脱硫剂具有很高的可行性与应用价值。

Currently,coal is the main energy source in China,mainly used in heating and power generation fields.During the use of coal,SO_(2)in flue gas will inevitably cause certain pollution to the environment,forcing the rapid development of flue gas desulfurization technology.The commonly used flue gas desulfurization processes mainly include wet flue gas desulfurization,dry flue gas desulfurization,and semi dry flue gas desulfurization,each with certain drawbacks.Based on this,flue gas circulation desulfurization and recovery technology has been developed.Compared with traditional desulfurization processes,the by-products generated by this process have certain value,and the desulfurizer can be recycled,which can significantly reduce its dosage.By analyzing the principles and difficulties of cyclic desulfurization technology,the key parameters of this technology,namely temperature and CO_(2)concentration,have been determined to have a significant impact on the adsorption and desorption of desulfurizers in cyclic desulfurization technology.Through computer technology,imidazole based ionic liquid was used as a desulfurizer to simulate and verify the SO_(2)cycle desulfurization and recovery technology.At 23℃,the average absorption molar ratio of CO_(2)and SO_(2)in the mixed gas by imidazole based ionic liquid desulfurizer was 1∶18.3,and at 108℃,the average absorption molar ratio of CO_(2)and SO_(2)in the mixed gas was 1∶17.8.Through simulation data analysis,it has been proven that imidazole based ionic liquids have high feasibility and application value as desulfurizers.