CN101422693A - 硫酸尾气深度脱硫方法 - Google Patents

硫酸尾气深度脱硫方法 Download PDF

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CN101422693A
CN101422693A CNA2008100690088A CN200810069008A CN101422693A CN 101422693 A CN101422693 A CN 101422693A CN A2008100690088 A CNA2008100690088 A CN A2008100690088A CN 200810069008 A CN200810069008 A CN 200810069008A CN 101422693 A CN101422693 A CN 101422693A
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tower
gas
tail gas
absorption liquid
ammonium sulfate
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喻爱民
李龙
张�诚
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Guizhou Kailin Group Co Ltd
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Guizhou Kailin Group Co Ltd
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Abstract

本发明公开了一种硫酸尾气深度脱硫方法,该方法是在硫酸装置的第二吸收塔后增设脱硫塔,从第二吸收塔排出的废气进入该脱硫塔后,用氨化吸收液循环吸收废气中的SO2生成亚硫酸铵;脱硫后的尾气经过塔内的除雾层除去酸雾,净化后尾气通过烟囱高空排放;吸收液中的亚硫酸铵在塔底经曝气氧化成硫酸铵溶液,当循环液硫酸铵浓度达到要求后送后续工序加工使用。本发明的硫酸尾气深度脱硫方法,可使硫酸装置排放尾气中SO2浓度在标准状况下低于100mg/m3,大大减少了尾气中SO2排放量,有利于大气环境质量的改善,符合节能减排、可持续发展的建设方针,有很好的社会效益,而且可增加回收硫酸铵的量,也有一定经济效益。

Description

硫酸尾气深度脱硫方法
技术领域
本发明与硫酸生产有关,具体而言,与硫酸尾气处理有关,尤其与脱除尾气中二氧化硫的方法有关。
背景技术
现有硫酸生产的两转两吸工艺尾气排放SO2浓度较高,标准状况下的浓度达到700~960mg/m3,对环境污染较严重,这是硫酸生产厂家一个急待解决的环境问题。
利用氨气脱除气体中SO2的技术,已在烟气脱硫的综合治理中得到了应用,例如中国专利申请件200410098788.0号“烟气脱硫副产物的综合利用装置及方法”、200510017797.7号“一种氨-硫酸铵干式烟气脱硫脱氮的设备及工艺方法”等。这些申请件虽然有其脱硫的效果,但这些技术方案主要适用于火力发电的锅炉或大型工业锅炉的烟气治理。有的采用一转一吸流程的硫酸生产企业,也曾采用氨气脱除吸收塔排放的废气中的SO2。为了提高转化率和吸收率,现在的硫酸生产厂家普遍采用两转两吸的流程。然而,目前尚无采用两转两吸流程的硫酸企业用氨气脱硫脱除尾气中SO2的报道,也没有相关技术申请的专利。
发明内容
本发明的目的就在于提供一种硫酸尾气深度脱硫方法,在两转两吸硫酸工艺的基础上引入氨法脱硫技术,使尾气排放SO2浓度低于排放标准,降低大气污染,改善环境状况。
发明人提供的硫酸尾气深度脱硫方法,是在硫酸装置的第二吸收塔后增设脱硫塔,从第二吸收塔排出的废气进入该脱硫塔后,用氨化吸收液循环吸收废气中的SO2生成亚硫酸铵;脱硫后的尾气经过塔内的除雾层除去酸雾,使尾气在标准状况下含水雾量小于75mg/m3,净化后尾气通过尾气烟囱高空排放;吸收液中的亚硫酸铵在塔底经由曝气风机鼓入的空气曝气氧化成硫酸铵溶液,当循环液硫酸铵浓度达到要求后送后续工序加工使用。
上述脱硫方法中,所循环使用的氨化吸收液为含有硫酸铵的溶液,由液氨与循环液混合生成。
上述脱硫方法中,所述脱硫塔的结构是:顶部有尾气烟囱;上部有除雾层,除雾层的下方有吸收液进口和吸收液喷洒头;中下部有尾气进口,下部有吸收液储段和吸收液出口;在塔内尾气由下而上、氨化吸收液由上而下进行逆流洗涤,在气液接触中进行传质。
本发明的硫酸尾气深度脱硫方法,可使硫酸装置排放尾气中SO2浓度在标准状况下低于100mg/m3。虽然增设脱硫塔会增加投资,增加系统阻力,但大大减少了尾气中SO2排放量,有利于大气环境质量的改善,符合节能减排、可持续发展的建设方针,有很好的社会效益,而且可增加回收硫酸铵的量,也有一定经济效益。
附图说明
附图为本发明的硫酸尾气深度脱硫方法流程示意图。图中1为脱硫塔,2为除雾器,3为尾气烟囱,4为氨化吸收液循环泵,5为硫酸铵溶液储槽,6为硫酸铵溶液泵,7为工艺水槽,8为工艺水泵,9为曝气风机,10为篮式过滤器。
具体实施方式
实施例贵州开磷集团公司硫酸生产为年产2×800kt/a的硫磺制酸装置,采用两转两吸的流程。
该公司在第二吸收塔后增设脱硫塔1,从第二吸收塔排出的废气进入脱硫塔1后由下而上、用氨化吸收液由上而下逆流循环吸收废气中的SO2生成亚硫酸铵;脱硫后的尾气经过塔内的除雾层2除去酸雾,使其在标准状况下含水雾量小于75mg/m3,净化后尾气通过尾气烟囱3高空排放,排放尾气中SO2浓度在标准状况下低于100mg/m3
液氨与工艺水不断加入脱硫塔1内,在脱硫塔1中反应并与循环液混合,以补充循环吸收液。吸收液中的亚硫酸铵在塔底经由曝气风机9鼓入的空气曝气氧化成硫酸铵溶液,当循环液硫酸铵浓度达到要求后送后续工序加工使用。

Claims (3)

1 硫酸尾气深度脱硫方法,利用氨法脱硫技术,其特征在于该方法是在硫酸装置的第二吸收塔后增设脱硫塔,从第二吸收塔排出的废气进入该脱硫塔后,用氨化吸收液循环吸收废气中的SO2生成亚硫酸铵;脱硫后的尾气经过塔内的除雾层除去酸雾,净化后尾气通过烟囱高空排放;吸收液中的亚硫酸铵在塔底经曝气氧化成硫酸铵溶液,当循环液硫酸铵浓度达到要求后送后续工序加工使用。
2 按照权利要求1所述的硫酸尾气深度脱硫方法,其特征在于所使用的氨化吸收液为含有硫酸铵的氨水。
3 按照权利要求1或2所述的硫酸尾气深度脱硫方法,其特征在于所述脱硫塔的结构是:顶部有尾气烟囱;上部有除雾层,除雾层的下方有吸收液进口和吸收液喷洒头;中下部有尾气进口,下部有吸收液储段和吸收液出口;尾气在塔内由下而上、氨化吸收液由上而下进行逆流洗涤,通过气液接触进行传质。
CNA2008100690088A 2008-11-24 2008-11-24 硫酸尾气深度脱硫方法 Pending CN101422693A (zh)

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CN102029105A (zh) * 2011-01-06 2011-04-27 上海克硫环保科技股份有限公司 一种双塔氨法脱硫装置及脱硫工艺方法
CN103721553A (zh) * 2014-01-07 2014-04-16 江苏新世纪江南环保股份有限公司 一种利用氨法脱硫技术高效去除酸性气硫化物的方法
CN104826510A (zh) * 2015-01-22 2015-08-12 成都国化环保科技有限公司 一种用于含二氧化硫气体增湿的增湿器
US10016721B1 (en) 2017-05-25 2018-07-10 Jiangnan Environmental Protection Group Inc. Ammonia-based desufurization process and apparatus
US10092877B1 (en) 2017-05-25 2018-10-09 Jiangnan Environmental Protection Group Inc. Dust removal and desulfurization of FCC exhaust gas
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US11027234B2 (en) 2018-04-13 2021-06-08 Jiangnan Environmental Protection Group Inc. Oxidization of ammonia desulfurization solution
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CN102029105A (zh) * 2011-01-06 2011-04-27 上海克硫环保科技股份有限公司 一种双塔氨法脱硫装置及脱硫工艺方法
CN103721553A (zh) * 2014-01-07 2014-04-16 江苏新世纪江南环保股份有限公司 一种利用氨法脱硫技术高效去除酸性气硫化物的方法
CN104826510A (zh) * 2015-01-22 2015-08-12 成都国化环保科技有限公司 一种用于含二氧化硫气体增湿的增湿器
CN104826510B (zh) * 2015-01-22 2017-09-29 成都国化环保科技有限公司 一种用于含二氧化硫气体增湿的增湿器
US10406477B2 (en) 2017-03-15 2019-09-10 Jiangnan Environmental Protection Group Inc. Method and apparatus for removing sulfur oxides from gas
US10413864B2 (en) 2017-03-15 2019-09-17 Jiangnan Environmental Protection Group Inc. Method and apparatus for removing sulfur oxides from gas
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US10471383B2 (en) 2017-05-25 2019-11-12 Jiangnan Environmental Protection Group Inc. Dust removal and desulfurization of FCC exhaust gas
US10092877B1 (en) 2017-05-25 2018-10-09 Jiangnan Environmental Protection Group Inc. Dust removal and desulfurization of FCC exhaust gas
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