热力发电2025，Vol.54Issue(10)：157-167,11.DOI:10.19666/j.rlfd.202501018
高效低成本复配吸收剂在燃煤烟气SO3脱除中的性能实验研究
Removal of SO3 from coal-fired flue gas by efficient and low-cost blended alkaline absorbent:performance study and experimental analysis
单传家 1于航 1陈恒 2李津津 3孙佳兴 4杭文林 4杨林军1
作者信息
- 1. 东南大学能源与环境学院,江苏 南京 210096
- 2. 浙大宁波理工学院机电与能源工程学院,浙江 宁波 315100
- 3. 南京林业大学材料科学与工程学院,江苏 南京 210037
- 4. 江苏国信扬州发电有限责任公司,江苏 扬州 225131
- 折叠
摘要
Abstract
The formation and emission of SO3 in coal-fired flue gas not only pose significant threats to atmospheric environments and human health but also negatively affect power plant operations.Injecting alkaline sorbents into flue gas has proven to be an effective method for SO₃ removal.The removal efficiency of SO3 by injecting Na2CO3 and Ca(OH)2 absorbents was investigated under different flue gas conditions,and the removal performance was compared with that of the blended absorbents.Moreover,the physicochemical properties of the alkaline absorbents before and after the reaction were characterized using SEM,XRD,FT-IR,and XPS techniques.Based on experimental data and characterization results,the gas-solid reaction model were proposed to elucidate the mechanisms of SO3 removal by Na2CO3 and Ca(OH)2.Furthermore,the adsorption process of Na2CO3 on SO3 was simulated,and the adsorption energy was calculated and compared with that of Ca(OH)2.The results showed that,Na2CO3 demonstrated superior SO3 removal efficiency compared with Ca(OH)2,and the removal efficiency was enhanced by increasing the reaction temperature,SO3 mass concentration,absorbent stoichiometric ratio and residence time.The blended absorbent with a molar ratio of Ca:2Na:S=5.00:1.25:1.00 achieved an SO3 removal efficiency of 86.07%under practical operating conditions at a low cost.The findings indicated that the gas-solid reaction between Na2CO3 and SO3 followed the shrinking core model,while the reaction between Ca(OH)2 and SO3 adhered to the grain model.The adsorption energy of SO3 on Na2CO3 was higher than that on Ca(OH)2.This study can provide theoretical insights and technical support for efficient and cost-effective removal of SO3 from coal-fired flue gas.关键词
燃煤烟气/SO3脱除/碱性吸收剂/复配碱性吸收剂Key words
coal-fired flue gas/SO3 removal/alkaline absorbent/blended alkaline absorbent引用本文复制引用
单传家,于航,陈恒,李津津,孙佳兴,杭文林,杨林军..高效低成本复配吸收剂在燃煤烟气SO3脱除中的性能实验研究[J].热力发电,2025,54(10):157-167,11.
