华中科技大学学报（自然科学版）2024，Vol.52Issue(10)：123-129,7.DOI:10.13245/j.hust.240091
模拟烟气碳化绿液脱硅固碳及对白泥品质的影响
Simulated flue gas carbonization green liquid desilication and carbon fixation and its impact on white mud quality
摘要
Abstract
To solve the problem of high silica content and poor quality of bagasse pulp white mud,which could affect the downstream utilization,and at the same time to reduce the release of CO2 from the boiler flue gas,the acidification desilication and carbon fixation of bagasse pulp green liquor was carried out by using a mixture of CO2 and air to simulate the boiler flue gas,and the causticizing reaction was carried out on the desiliconized green liquor.Results show that the desilication efficiency of green liquor is 75.34%±2.74%under the conditions of reaction temperature of 80℃,time of 6 h,aeration rate of 500 L∙L-1∙h-1(CO2 volume fraction of 10%)and bentonite addition of 0.15 g∙L-1.After desilication,the causticizing rate of green liquor increases by more than 4.5%,but the consumption of calcium oxide increases by about 20%.The mass fraction of calcium carbonate in the white sludge produced by causticizing increases from 89.49%to 98.80%,the mass fraction of SiO2 decreases from 2.63%to 0.63%,and meanwhile the contents of magnesium,silica,chlorine,water-soluble salts and other impurities all decrease,improving the quality of white sludge.The theoretical carbon sequestration potential of bagasse pulp green liquor is 25.69 kg/m3,and the carbon sequestration of green liquor produced by tons of pulp accounts for 4.46%of carbon release from boiler flue gas;the actual carbon sequestration is 15.47 kg/m3,accounting for 2.68%of carbon release from boiler flue gas.关键词
锅炉烟气/脱硅/苛化/白泥品质/绿液固碳Key words
boiler flue gas/desilicication/causticization/white mud quality/green liquor carbon sequestration分类
资源环境引用本文复制引用
赵博超,吕金容,陈绍波,潘涔轩..模拟烟气碳化绿液脱硅固碳及对白泥品质的影响[J].华中科技大学学报（自然科学版）,2024,52(10):123-129,7.基金项目
广西重点研发计划资助项目(2019AB18024). （2019AB18024）
