CN1121475C - 焦炉煤气终冷碱洗精脱硫工艺 - Google Patents

焦炉煤气终冷碱洗精脱硫工艺 Download PDF

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CN1121475C
CN1121475C CN00110168A CN00110168A CN1121475C CN 1121475 C CN1121475 C CN 1121475C CN 00110168 A CN00110168 A CN 00110168A CN 00110168 A CN00110168 A CN 00110168A CN 1121475 C CN1121475 C CN 1121475C
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alkali
final cooling
gas
coal gas
ammonia
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CN1263932A (zh
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于义林
张兴柱
武占先
张素利
董天和
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Anshan General Design Inst Of Coking Refractory Materials Chinese Metallurgica
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Abstract

本发明涉及含有一氧化碳可燃气体的提纯的焦炉煤气净化工艺,焦炉煤气采用氨法脱硫后煤气中硫化氢含量在50-100mg/m3,仍不能达到城市煤气标准(≤20mg/m3),煤气经脱氨后在终冷碱洗装置利用分解剩余氨水中固定铵的碱进行冷却碱洗,吸收煤气中的硫化氢,可达到煤气中硫化氢含量≤20mg/m3。从终冷碱洗装置排出的多余冷凝碱液送蒸氨装置继续利用。此工艺流程短,投资少,成本低,资源利用合理,且无废液,脱硫效率高。

Description

焦炉煤气终冷碱洗精脱硫工艺
本发明涉及含有一氧化碳可燃气体的提纯的焦炉煤气净化工艺,特别是一种利用分解剩余氨水中固定铵的碱脱除煤气中残留的硫化氢工艺。
目前,国内外在焦炉煤气精脱硫方面仅有干法脱硫工艺,但其投资高、劳动强度大,且有二次污染。我国自己开发出的H.P.F氨法脱硫工艺,(已申报专利,专利申请号96119502.9,名称:以对苯二酚酞菁钴磺酸盐硫酸亚铁为复合催化剂的氨法焦炉煤气脱硫脱氰工艺),虽然经济合理,效率高,但脱硫后仍达不到城市煤气标准(≤20mg/m3),因此,煤气还需进一步采用干法脱硫工艺处理。
根据国家《污水综合外排标准》规定,焦化厂外排污水中氨氮含量不大于15mg/l,煤气净化生产中产生的剩余氨水(总氨含量约5g/l,其中一半为固定铵),在蒸氨处理时必须加碱分解其中的固定铵,使蒸铵废水总氨含量不大于150mg/l后,才能送生化装置进一步处理。
鉴于存在的上述问题,本发明的目的是设计一种焦炉煤气氨法脱硫后在终冷装置利用分解剩余氨水中固定铵的碱脱除残留的硫化氢的工艺方法。
为实现本发明的目的,采取如下技术措施:
一种焦炉煤气终冷碱洗精脱硫工艺,焦炉煤气经预冷塔预冷后进入脱硫塔与再生后的脱硫液逆向接触脱除硫化氢;其特征在于脱硫后的煤气经脱氨装置后进入终冷碱洗装置,煤气在终冷减洗装置的流速为1-1.5m/s,塔喷淋密度为10-20m3/m2h,利用分解剩余氨水中固定铵的碱进行冷却碱洗,吸收煤气中的硫化氢,用来分解剩余氨水中固定铵的碱的碱度保持为0.5N-1N,在终冷出口煤气温度24-30℃条件下,脱除煤气中的硫化氢。
终冷碱洗装置设计成带外冷器的两段填料塔,下段为终冷段,上段为碱洗段,从终冷碱洗装置排出的多余冷凝碱液送蒸氨装置用来分解固定铵。
本发明焦炉煤气终冷碱洗精脱硫工艺,具有工艺流程短,资源合理利用,且无废液,投资少,成本低,经脱硫后的焦炉煤气可达到城市煤气使用标准(硫化氢含量≤20mg/m3)。
图1为焦炉煤气终冷碱洗精脱硫工艺流程图。
下面结合附图和实施例详细介绍本发明的技术内容。
从冷凝鼓风装置来的焦炉煤气经预冷塔1预冷后进入脱硫塔2与再生后的脱硫液逆向接触脱除硫化氢,此时煤气含硫化氢虽然小于100mg/m3,但不能达到城市煤气标准(≤20mg/m3),再经脱氨装置3进入终冷碱洗装置4,为了降低投资终冷碱洗装置4可以分成上下两段,设计成带外冷器的两段填料塔,其下段为终冷段,上段为碱洗段,焦炉煤气在终冷段冷却后进入碱洗段,在此利用分解剩余氨水中固定铵的碱进行冷却碱洗,吸收煤气中的硫化氢。利用分解剩余氨水中固定铵的碱度保持为0.5-1N,终冷出口煤气温度24-30℃,特别在25-27℃条件下更经济合理,在此条件下脱除煤气中残留的硫化氢。焦炉煤气在终冷碱洗装置4的流速为1-1.5m/s,塔喷淋密度为10-20m3/m2h,精脱硫后煤气中硫化氢含量≤20mg/m3,然后煤气送洗苯。终冷含碱冷凝液送蒸氨装置5,从蒸氨装置5顶出来的氨汽进入预冷塔1,塔底废水(总氨含量≤150mg/l)送生化装置处理。(实施例1数据见表1)
表1:
    工艺参数   实施例1   实施例2   实施例3
煤气流速m/s     1.21     1.32     1.40
煤气入塔温度t℃     55     54.5     53.5
煤气出塔温度t℃     26.5     26.1     25
终冷循环液碱度N     0.65     0.68     0.75
终冷碱洗装置塔喷淋密度m3/m2h     12     12.5     12.7
终冷碱洗装置入口H2S含量mg/m3     60     70     80
终冷碱洗装置出口H2S含量mg/m3     18.5     19     19.5

Claims (4)

1.一种焦炉煤气终冷碱洗精脱硫工艺,焦炉煤气经预冷塔预冷后进入脱硫塔与再生后的脱硫液逆向接触脱除硫化氢;其特征在于脱硫后的煤气经脱氨装置后进入终冷碱洗装置,煤气的流速为1-1.5m/s,塔喷淋密度为10-20m3/m2h,在此利用分解剩余氨水中固定铵的碱进行冷却碱洗,吸收煤气中的硫化氢。
2.根据权利要求1所述的焦炉煤气终冷碱洗精脱硫工艺,其特征在于;用来分解剩余氨水中固定铵的碱的碱度保持为0.5N-1N,在终冷出口煤气温度24-30℃条件下,脱除煤气中的硫化氢。
3.根据权利要求1或2所述的焦炉煤气终冷碱洗精脱硫工艺,其特征在于:终冷碱洗装置设计成带外冷器的两段填料塔,下段为终冷段,上段为碱洗段,从终冷碱洗装置排出的多余冷凝碱液送蒸氨装置用来分解固定铵。
4.根据权利要求3所述的焦炉煤气终冷碱洗精脱硫工艺,其特征在于:终冷出口处的煤气温度是25-27℃。
CN00110168A 2000-02-29 2000-02-29 焦炉煤气终冷碱洗精脱硫工艺 Expired - Lifetime CN1121475C (zh)

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CN101412931B (zh) * 2008-04-17 2011-12-07 首钢总公司 脱除高炉煤气中酸性气体的方法
CN101993699A (zh) * 2009-08-31 2011-03-30 吉林东圣焦化有限公司 一种焦化间接终冷塔循环洗涤工艺
CN101760251B (zh) * 2009-12-29 2013-05-29 中冶焦耐(大连)工程技术有限公司 一种节水、节能并减少设备腐蚀的焦炉煤气净化新工艺及装置
CN104479762A (zh) * 2014-11-26 2015-04-01 北京首钢国际工程技术有限公司 一种焦炉煤气脱硫碱洗工艺
CN108998106B (zh) * 2018-08-27 2022-01-28 太原理工大学 一种焦化厂脱硫脱氨方法

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CN1227253A (zh) * 1998-12-30 1999-09-01 宝山钢铁(集团)公司 一种焦炉煤气脱硫脱氰方法

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CN1227253A (zh) * 1998-12-30 1999-09-01 宝山钢铁(集团)公司 一种焦炉煤气脱硫脱氰方法

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