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    炼油与合成气领域中合成氨厂弛放气中回收氢气

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    从合成氨净化气中回收 氢气/HYDROGEN RECOVERY FROM AMMONIA PLANT PURGE GAS

    1. 详细信息

    问题

    在合成氨生产过程中,氢气和氮气在高压下反应形成氨。由于单程转化率达不到100%,所以反应器是在循环模式下运行的。氨不停地冷凝流出循环,新鲜合成气不停地加入到反应器。由于合成气含有少量的甲烷和氩气,这些杂质会在循环过程中积聚,必须不断排放以防止这些杂质超过一定浓度影响反应。虽然这些弛放气可以作为转化炉燃料的补充气,但它含有的宝贵氢气会从氨气合成回路中损失掉。

    VaporSep-H2™ 解决方案

    VaporSep-H2系统包含一个单级膜系统,能回收弛放气中大部分的氢气。渗透穿过膜的氢气几乎不含甲烷和氩气,这部分氢气被循环回到合成气压缩机入口,增压后返回到合成气回路中。含有被排放甲烷和氩气的贫氢气渗余相,被送往转化炉作为燃料。VaporSep-H2系统能回收弛放气中80%的氢气。安装一套这种装置后,可以在不增加转化炉气体进料的情况下使氨的产量增加4%~5%

    优点

    从合成氨厂弛放气中回收有价值的氢气

    ■ 能增加4%~5%的氨产率

    ■ 减少单位氨产量的气体消耗量

    ■ 不需要增加额外的动设备

    ■ 操作简单,无源系统

    ■ 室温下操作

    撬装结构安装简单

    Problem
    In ammonia production, hydrogen and nitrogen are reacted at high pressure to form ammonia. Since the conversion per pass is not 100%, the reactor is operated in loop mode. Ammonia is continuously condensed out of the loop and fresh synthesis gas is added. Because the synthesis gas contains small quantities of methane and argon, these impurities build up in the loop and must  be continuously purged to prevent them from exceeding a certain concentration. Although this purge stream can be used to supplement reformer fuel gas, it contains valuable hydrogen which is lost from the ammonia synthesis loop.

    VaporSep-H2™ Solution

    The VaporSep-H2™ unit consists of a single-stage membrane system that recovers most of the hydrogen from the purge gas stream. The hydrogen permeating the membrane, almost free of methane and argon, is recycled to the synthesis gas compressor suction, pressurized and returned to the synthesis loop. The hydrogen depleted residue, containing the purged methane and argon, is sent to reformer fuel.
    VaporSep-H2™ systems recover more than 80% of purge gas hydrogen. Installation of such a unit will increase ammonia production by 4-5%, without increasing gas feed to the reformer.

    Benefits

    ■ Recovers valuable hydrogen  in ammonia plant purge gas

    ■ Increases ammonia production  by 4-5%

    ■ Less gas consumed per kg ammonia produced

    ■ Requires no additional rotating equipment

    ■ Easy to operate, passive system

    ■ Ambient temperature operation

    ■ Simple installation with skid-mounted construction