CN1321723C - 氨法脱除回收烟气中二氧化硫的方法 - Google Patents

氨法脱除回收烟气中二氧化硫的方法 Download PDF

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CN1321723C
CN1321723C CNB031582575A CN03158257A CN1321723C CN 1321723 C CN1321723 C CN 1321723C CN B031582575 A CNB031582575 A CN B031582575A CN 03158257 A CN03158257 A CN 03158257A CN 1321723 C CN1321723 C CN 1321723C
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ammonia
absorption
flue gas
liquid
absorption liquid
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CNB031582575A
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CN1597060A (zh
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徐长香
罗静
傅国光
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镇江市江南环保设备研究所
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Abstract

本发明属于环保技术领域,涉及烟气中二氧化硫的脱除和回收方法,具体是一种氨法脱除回收烟气中二氧化硫的方法。烟气的脱硫过程在一个具有多级功能段的吸收塔中进行,在除尘降温工序,按照1∶2000~1∶1200的液气比,用碱度为10-18滴度、铵盐含量为350g/l~700g/l的吸收液进行喷淋,使烟气温度降至85-75℃;在主吸收工序,按照1∶2500~1∶1500的液气比,用碱度为10-18滴度、铵盐含量为200g/l~450g/l的吸收液进行喷淋;在除雾除氨工序,用水或低碱度吸收液进行喷淋吸收,最后排放。本发明的方法操作简便、净化后烟气中的气溶胶少、可副产多种产品,同时节约能耗和吸收液。

Description

氨法脱除回收烟气中二氧化硫的方法
技术领域
本发明属于环保技术领域,涉及烟气中二氧化硫的脱除和回收方法,具体是一种氨法脱除回收烟气中二氧化硫的方法。
背景技术
烟气尤其是燃煤锅炉烟气是大气污染最主要的根源之一,已成为环境治理的重要对象。目前,中国每年由烟气排入大气的SO2总量在2000万吨左右,这本应是一项具有巨大价值的硫资源,却成为环境危害巨大的污染源。在现有的烟气脱硫净化技术中,氨法脱硫可在脱硫的同时副产硫酸、二氧化硫、硫酸铵、亚硫酸铵等产品,实现了硫资源的回收利用,不产生任何的二次污染,属于绿色清洁的脱硫技术。然而,在大烟气量,特别是烟煤电站锅炉烟气的治理中,现有的氨法技术暴露了氨耗高、气溶胶难以消除、吸收液处理成本高、操作难度大等问题。这些技术难题使氨法脱硫技术的推广遇到较大障碍。
发明内容
本发明所要解决的技术问题是,提供一种用氨(液氨、氨水、碳铵等)作吸收剂,可供副产二氧化硫、硫酸、硫酸铵等多种产品,净化后烟气中的气溶胶少、操作简便的氨法脱除回收烟气中二氧化硫的方法。
本发明的方法是:烟气的脱硫过程在一个具有多级功能段的吸收塔中进行,吸收塔的下部为除尘降温段,中部为主吸收段,上部为除雾除氨段,各功能段设置有喷淋装置,其脱硫工艺流程及参数如下:
a.除尘降温工序,烟气由塔底进入除尘降温段,按照1∶2000~1∶1200的液气比,用碱度为10-18滴度、铵盐含量为350g/l~700g/l的吸收液进行喷淋,使烟气温度降至85-75℃;b.主吸收工序,烟气经除尘降温后进入主吸收段,按照1∶2500~1∶1500的液气比,用碱度为10-18滴度、铵盐含量为200g/l~450g/l的吸收液进行喷淋;c.除雾除氨工序,烟气由主吸收段进入除雾除氨段,用水或碱度不大于10滴度的低碱度吸收液进行喷淋吸收,以减少净化后烟气中的气溶胶,并降低氨耗,最后排放。
为了降低吸收塔的烟气压降,以节省运行电耗,吸收塔以空塔结构为主,可根据需要在除雾除氨段和主吸收段使用比表面积大于300m2/m3的波纹填料,保证脱硫塔总压降在1000Pa以下。
当吸收塔直径较大时,为保证大烟气量分布均匀,使脱硫过程稳定高效,在塔内可设置一到两层开孔率在40%以上的气体分布板,使气体重新均布。
本发明的方法操作简便、净化后烟气中的气溶胶少、可副产二氧化硫、硫酸、硫酸铵等多种产品、同时节约能耗和吸收液。
附图说明
图1是本发明方法实施例使用设备及工艺的原理图。
图中的序号说明如下:1为吸收塔降温除尘段;2为吸收塔主吸收段;3为吸收塔除雾除氨段;4为喷淋装置;5、8为循环泵;6、7为循环槽。
具体实施方式
本发明的具体实施例如下:75t/h燃煤工业锅炉一座,烟气量110000Nm3/h,锅炉耗煤量18.48t/h,燃煤的全硫3%,排烟温度170℃,原始含尘6500mg/Nm3,电除尘效率98.5%。脱硫塔φ4500×H24000、采用空塔结构分为两段三级喷淋、无填料(如图1示)。
操作参数:降温除尘段——吸收液浓度432g/l、碱度16滴度,喷淋量120m3/h,烟气出降温除尘段的温度为46℃。
主吸收段——吸收液浓度246g/l、碱度21滴度,喷淋量120m3/h。。
除雾除氨段——喷水量12m3/h,洗涤液为锅炉废水和补充水。
结果:副产铵盐成份为亚硫酸铵143g/l、亚硫酸氢铵295g/l、硫酸铵78g/l。尾气中二氧化硫含量97mg/Nm3,尾气中氨的含量17mg/Nm3。脱硫装置总压力降1270Pa。

Claims (3)

1.一种氨法脱除回收烟气中二氧化硫的方法,其特征是:烟气的脱硫过程在一个具有多级功能段的吸收塔中进行,吸收塔的下部为除尘降温段,中部为主吸收段,上部为除雾除氨段,各功能段设置有喷淋装置,其脱硫工艺流程及参数如下:a.除尘降温工序,烟气由塔底进入除尘降温段,按照1∶2000~1∶1200的液气比,用碱度为10-18滴度、铵盐含量为350g/l~700g/l的吸收液进行喷淋,使烟气温度降至85-75℃;b.主吸收工序,烟气经除尘降温后进入主吸收段,按照1∶2500~1∶1500的液气比,用碱度为10-18滴度、铵盐含量为200g/l~450g/l的吸收液进行喷淋;c.除雾除氨工序,烟气由主吸收段进入除雾除氨段,用水或碱度不大于10滴度的低碱度吸收液进行喷淋吸收,以减少净化后烟气中的气溶胶,并降低氨耗,最后排放。
2.根据权利要求1所述的氨法脱除回收烟气中二氧化硫的方法,其特征是:所述吸收塔以空塔结构为主,仅在除雾除氨段和主吸收段使用比表面积大于300m2/m3的波纹填料,保证脱硫塔总压降在1000Pa以下。
3.根据权利要求1或2所述的氨法脱除回收烟气中二氧化硫的方法,其特征是:在吸收塔内设置一到两层开孔率在40%以上的气体分布板,使烟气分布均匀。
CNB031582575A 2003-09-17 2003-09-17 氨法脱除回收烟气中二氧化硫的方法 CN1321723C (zh)

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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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