碱式硫酸铝脱硫富液压力与温度对解吸性能的影响  

Effect of Pressure and Temperature on Desorption Performance of Basic Aluminum Sulfate Desulfurization Rich Solution

作　　者：张子敬[1] 杨淼 刘运巍 云峰[1] 李中义 王聪宇 张颖 ZHANG Zijing;YANG Miao;LIU Yunwei;YUN Feng;LI Zhongyi;WANG Congyu;ZHANG Ying(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China;Hohhot Ecological Environment Technology Promotion Center,Hohhot Inner Mongolia 010010,China)

机构地区：[1]内蒙古工业大学能源与动力工程学院,内蒙古呼和浩特010051 [2]呼和浩特市生态环境科技推广中心,内蒙古呼和浩特010010

出　　处：《当代化工》2025年第1期16-20,26,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金项目(项目编号:51966011、51566013);自治区直属高校基本科研业务费项目(项目编号:JY20220309);内蒙古自然科学基金项目(项目编号:2019MS05074、2023MS05017);内蒙古工业大学科学研究项目(项目编号:BS201923)。

摘　　要：如何在较低的温度下获得较高的解吸性能是解决碱式硫酸铝解吸法脱硫的重要环节。对比常压热解吸研究了负压和解吸温度匹配关系对解吸性能的影响规律。结果表明:虽然提高温度和降低压力均能提高解吸率,但压力越低温度对解吸率提高的影响程度越高。相比80℃常压解吸的最优工况,降低压力至70 kPa和80 kPa,60℃仍具有等价的解吸能力,解吸率提高量分别为-0.52%~2.01%和-2.63%~-0.44%。进一步提高解吸温度至70℃和80℃,解吸率提高量随时间呈先增加后减少的变化规律,40 min达到最大值,且70 kPa相比80 kPa分别提高4.42%和1.63%。较高的解吸温度和较低的解吸压力对解吸速率的提高同样有利,但降低压力至80 kPa需要提高解吸温度或延长解吸时间才能发挥出更高的解吸潜能,过高的温度由于SO32-浓度较低导致解吸性能的提高能力变弱。相比90 kPa降低至80 kPa,压力从80 kPa降低至70 kPa的解吸速率提高幅度大幅降低至50%左右。实验工况最佳的压力与温度匹配关系为70 kPa、70℃。How to achieve high desorption performance at lower temperatures is an important link in solving the desulfurization problem of alkaline aluminum sulfate desorption method.In this paper,the influence of the matching relationship between negative pressure and desorption temperature on desorption performance was compared through atmospheric pressure thermal desorption.The results showed that increasing temperature and decreasing pressure could improve desorption performance,the lower the pressure,the higher the degree of influence of temperature on the improvement of desorption ratio.Compared to the optimal conditions for atmospheric desorption at 80℃,reducing the pressure to 70 kPa and 80 kPa still hadequivalent desorption capacity at 60℃,with an increase in desorption ratio of -0.52% to 2.01% and -2.63% to -0.44%,respectively.Further increasingthe desorption temperature to 70℃and 80℃,the increase in desorption ratio followeda pattern of first increasing and then decreasing with time.It reached its maximum value in 40 min,and the increase in desorption ratioat 70 kPa was 4.42% and 1.63% higher than thatat 80 kPa,respectively.Higher desorption temperature and lower desorption pressure were equally beneficial for improving desorption rate,but reducing the pressure to 80 kPa required increasing the desorption temperature or extending desorption time to unleash higher desorption potential.Excessive temperature weakened the ability to improve desorption performance due to lower SO32-concentration.Compared to the decreasing from 90 kPa to 80 kPa,the increase in desorption rate when the pressure decreased from 80 kPa to 70 kPa wassignificantly reduced to about 50%.The optimal pressure temperature matching relationship for experimental conditions was70 kPa and 70℃.

关 键 词：碱式硫酸铝 脱硫富液 负压解吸 温度 

分 类 号：X511[环境科学与工程—环境工程] TQ028.17[化学工程]