Abstract:

The hydrogen products pressure of conventional hydrogen recovery methods is low and can only be used by the high-pressure hydrogenation units after multistage pressurization, which has high hydrogen pressurization cost. The hydrate method for recovery of hydrogenation tail gas has the advantages of slight pressure drop loss and high product hydrogen pressures, which can effectively reduce the hydrogen pressurization cost for high-pressure hydrogenation units. To reduce the utilized cost of hydrogen for high-pressure hydrogenation units, we developed the hydrate hydrogen recovery technology. We established a hydrate industrial side-stream trial unit in a Maoming refinery factory to recover hydrogen from a diesel hydrogenation unit tail gas. The separation effect of hydrogen recovered from diesel hydrogenation tail gas using the continuous stirred tank method under different conditions was investigated. The trial results show that most CH₄ and almost 100% H₂S can be effectively removed by the hydrate method. In the continuous trials, the hydrogen volume fraction increases from 83.76% to 91.65%, and H₂S volume fraction from 0.73% to 0.07%.

Key words: hydrates, hydrogenation tail gas recovery, sideline trial, continuously stirred tank reactor, hydrogen recovery

摘要：

常规氢气回收方法的产品氢气压力偏低，需多级增压后才可被高压加氢装置利用，具有较高的氢气增压成本。水合物法回收加氢尾气具有压降损失小、产品氢气压力高的优点，可降低高压加氢装置的氢气增压成本。为降低高压加氢装置的用氢成本，本文开发了高压尾气的水合物法氢气回收技术。针对高压柴油加氢尾气，在茂名炼油厂建立了一套柴油加氢尾气中氢气水合物法回收的工业侧线试验装置，考察了不同条件下连续搅拌釜法回收柴油加氢尾气中氢气的分离效果。试验结果表明，水合物法可高效脱除CH₄和大部分的H₂S。连续进气工况下，处理脱硫后尾气时可将氢气体积分数从83.76%提高至91.65%，处理含硫尾气时可将H₂S体积分数从0.73%降至0.07%。

关键词: 水合物, 加氢尾气回收, 侧线试验, 连续搅拌反应器, 氢气回收