CN110054154A - 一种兰炭气的净化方法及其净化系统 - Google Patents

一种兰炭气的净化方法及其净化系统 Download PDF

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CN110054154A
CN110054154A CN201910041223.5A CN201910041223A CN110054154A CN 110054154 A CN110054154 A CN 110054154A CN 201910041223 A CN201910041223 A CN 201910041223A CN 110054154 A CN110054154 A CN 110054154A
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张艺馨
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Wuhan Grains Environmental Protection Co Ltd
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Abstract

本发明公开了一种兰炭气的净化方法及其净化系统，所述兰炭气的净化方法包括以下步骤：S1、水洗；S2、降温；S3、除油；S4、升温；S5、脱毒；S6、加湿；S7、耐硫变换；S8、热量回收；S9、冷却操作，冷却完成后即完成了兰炭气的净化操作；所述兰炭气净化系统包括洗涤塔、煤气水冷器、除油炉、预热交换器、主热交换器、脱毒炉、增湿器、变换炉、变换气水冷器；洗涤塔的进气口与兰炭生产装置的排气口连接，洗涤塔、煤气水冷器、除油炉、预热交换器、主热交换器、脱毒炉、增湿器、变换炉、变换气水冷器依次通过通气管道连接。

Description

一种兰炭气的净化方法及其净化系统
技术领域
本发明涉及环保领域，尤其涉及一种兰炭气的净化方法及其净化系统。
背景技术
兰炭生产过程中，每生产1吨兰炭将产生约700m3兰炭气。目前，大量兰炭气多放空或直接燃烧排放，不仅严重污染环境，也造成大量的能源浪费。典型的兰炭气主要组分为H220-28%、Co9-18%、Co28-12%、O20.5-2.0%、N237-43%、CH47-10%、CmHn1-3%，除此外，兰炭气中还含有焦油、苯、奈、酚、粉尘、硫化物、氨、氟、氯、重金属等杂质。由于气体中氮含量高、氢含量低、热值低、杂质多，不宜直接作为燃气。但其中的H2、Co和CH4都是十分宝贵的化工原料。如果将其进行有效地利用,不仅可以减少直接排放所造成的环境污染,还可以化废为宝为企业创造一定的经济效益，但是对兰炭气直接进行变换操作会导致除氧剂和变换催化剂在较短时间中毒失活，从而影响了兰炭气变换操作的稳定运行。
发明内容
本发明目的是针对上述需求，提供一种可以稳定运行的兰炭气的净化方法及其净化系统。
为了实现上述目的，本发明的技术方案是：
一种兰炭气的净化方法，包括以下步骤：
S1、将兰炭生产中排出的兰炭气进行水洗操作除去兰炭气中的氨气；
S2、对除去氨气的兰炭气进行降温并分离出兰炭气中的油、水；
S3、将降温后的兰炭气通过除油器进一步脱除焦油；
S4、将脱除焦油后的兰炭气通过热交换装置进行升温；
S5、将升温后的兰炭气通过脱毒炉脱除兰炭气中的毒物和兰炭气中的氧；
S6、将脱毒脱氧后的兰炭气进行喷水降温后对其补充蒸汽；
S7、对补充蒸汽后的兰炭气进行一级或两级CO耐硫变换，得到含有H2和少量CO的变换气；
S8、将得到的变换气经过热量回收装置回收热量；
S9、将回收热量后的变换气进行冷却操作，冷却完成后即完成了兰炭气的净化操作。
进一步的，所述步骤S1中，采用冷凝液并补充新鲜水进行循环水洗操作。
进一步的，所述步骤S3中的除油器中装填除油剂。
进一步的，所述步骤S5中的脱毒炉中装填有保护剂和耐硫脱氧脱毒剂。
进一步的，所述步骤S8中的热量回收装置为热交换器、废热锅炉、锅炉水加热器热器、脱盐水加热器热器中的一种或几种的组合。
进一步的，所述步骤S9中，采用风冷、水冷中的一种或两者的组合进行冷却操作。
一种兰炭气净化系统，所述兰炭气净化系统包括洗涤塔、煤气水冷器、除油炉、预热交换器、主热交换器、脱毒炉、增湿器、变换炉、变换气水冷器；洗涤塔的进气口与兰炭生产装置的排气口连接，洗涤塔、煤气水冷器、除油炉、预热交换器、主热交换器、脱毒炉、增湿器、变换炉、变换气水冷器依次通过通气管道连接。
进一步的，所述变换炉上设置有变换气出口，变换气出口通过通气管道与主热交换器的热气进口连接，主热交换器的热气出口连接废热锅炉的热气进口连接，废热锅炉的热气出口连接变换炉的变换气进口。
进一步的，所述变换炉与变换气水冷器之间的通气管道分别连接预热交换器、锅炉水加热器、脱盐水加热器；变换炉的排气口分别与预热交换器的热气进口、锅炉水加热器的进气口连接，预热交换器的热气出口、锅炉水加热器的出气口均与脱盐水加热器的进气口连接，脱盐水加热器的出气口连接变换气水冷器的进气口。
进一步的，所述洗涤塔、脱盐水加热器均与外界的脱盐水管连接；所述锅炉水加热器、增湿器、废热锅炉均与外界的除氧水管连接；所述废热锅炉的蒸汽排出管道、外界的蒸汽管道均和增湿器出气口与变换炉进气口之间的通气管道连接。
与现有技术相比，本发明具有的优点和积极效果是：
本发明提供了兰炭气的净化方法以及净化系统，其使用合适的工艺及除油剂、保护剂、催化剂，通过水洗、脱水、除油、升温、脱毒、除氧、补水、变换、热量回收、冷却等步骤，使兰炭气净化以及变换操作能够长期稳定的运行，解决了除氧剂和变换催化剂变换气过程中毒失活的问题，为下游工序提取氢气或者生产合成氨提供了稳定、合格的气体，并且对于变换过程中产生的热量进行了回收利用，使得资源利用最大化，减少了兰炭气净化的消耗的同时避免了造成能源浪费的状况发生。
附图说明
图1为兰炭气的净化换气系统结构图。

Claims (10)

1.一种兰炭气的净化方法，其特征在于：包括以下步骤：
S1、将兰炭生产中排出的兰炭气进行水洗操作除去兰炭气中的氨气；
S2、对除去氨气的兰炭气进行降温并分离出兰炭气中的油、水；
S3、将降温后的兰炭气通过除油器进一步脱除焦油；
S4、将脱除焦油后的兰炭气通过热交换装置进行升温；
S5、将升温后的兰炭气通过脱毒炉脱除兰炭气中的毒物和兰炭气中的氧；
S6、将脱毒后的兰炭气进行喷水降温后对其补充蒸汽；
S7、对补充蒸汽后的兰炭气进行一级或两级CO耐硫变换，得到含有H2和CO的变换气；
S8、将得到的变换气经过热量回收装置回收热量；
S9、将回收热量后的变换气进行冷却操作，冷却完成后即完成了兰炭气的净化操作。
2.如权利要求1所述的兰炭气的净化方法，其特征在于：所述步骤S1中，采用冷凝液并补充新鲜水进行循环水洗操作。
3.如权利要求1所述的兰炭气的净化方法，其特征在于：所述步骤S3中的除油器中装填除油剂。
4.如权利要求1所述的兰炭气的净化方法，其特征在于：所述步骤S5中的脱毒炉中装填有保护剂和耐硫脱氧脱毒剂。
5.如权利要求1所述的兰炭气的净化方法，其特征在于：所述步骤S8中的热量回收装置为热交换器、废热锅炉、锅炉水加热器热器、脱盐水加热器热器中的一种或几种的组合。
6.如权利要求1所述的兰炭气的净化方法，其特征在于：所述步骤S9中，采用风冷、水冷中的一种或两者的组合进行冷却操作。
7.一种根据权利要求1所述的兰炭气的净化方法构建的兰炭气净化系统，其特征在于：所述兰炭气净化系统包括洗涤塔、煤气水冷器、除油炉、预热交换器、主热交换器、脱毒炉、增湿器、变换炉、变换气水冷器；洗涤塔的进气口与兰炭生产装置的排气口连接，洗涤塔、煤气水冷器、除油炉、预热交换器、主热交换器、脱毒炉、增湿器、变换炉、变换气水冷器依次通过通气管道连接。
8.如权利要求7所述的兰炭气净化系统，其特征在于：所述变换炉上设置有变换气出口，变换气出口通过通气管道与主热交换器的热气进口连接，主热交换器的热气出口连接废热锅炉的热气进口连接，废热锅炉的热气出口连接变换炉的变换气进口。
9.如权利要求7所述的兰炭气净化系统，其特征在于：所述变换炉与变换气水冷器之间的通气管道分别连接预热交换器、锅炉水加热器、脱盐水加热器；变换炉的排气口分别与预热交换器的热气进口、锅炉水加热器的进气口连接，预热交换器的热气出口、锅炉水加热器的出气口均与脱盐水加热器的进气口连接，脱盐水加热器的出气口连接变换气水冷器的进气口。
10.如权利要求9所述的兰炭气净化系统，其特征在于：所述洗涤塔、脱盐水加热器、变换气水冷器均与外界的脱盐水管连接；变换气水冷器与循环水水管连接；所述锅炉水加热器、增湿器、废热锅炉均与外界的除氧水管连接；所述废热锅炉的蒸汽排出管道、外界的蒸汽管道均和增湿器出气口与变换炉进气口之间的通气管道连接。
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CN114367182B (zh) * 2022-01-17 2022-10-04 湖北禾谷环保有限公司 一种矿热炉尾气低氢低压耐硫脱氧工艺

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