合成氨含硫化氢废气的深度脱硫及资源化利用技术

Technology on Deep Desulfurization of Hydrogen Sulfide Waste Gas from Synthetic Ammonia Plant and Its Resource Utilization

随着环保要求的逐步提升,含硫工业废气的脱除力度正日益加强。本文针对来自合成氨工艺5.0×10^5 t/a含硫化氢废气源,提出利用New Sulfinol法与赤泥-氧化锌法的干湿法组合工艺进行硫化氢深度脱除、并将提浓硫化氢用作高附加值甲硫醇产品的深度脱硫及资源化利用技术。同时采用模拟软件Aspen Plus对提出的新工艺进行了全流程模拟,采用了硫化氢循环及双效精馏降低操作能耗,对反应与分离设备进行了条件优化。模拟结果表明脱硫率极高,且具有一定的工业可行性。

With the improvement of environmental protection requirements,the removal of sulfur-containing industrial waste gas has been strengthened.In order to treat H2S tail gas of 5.0×10^5 t/a from synthetic ammonia plant,a hybrid processing scheme,which consists of a wet process adopting New Sulfinol method and a dry process using red mud and zinc oxide as desulfurizers,was proposed to make sure the deeply removed of hydrogen sulfide.The concentrated hydrogen sulfide was used to synthesize methyl mercaptan,a kind of high value-added product.The presented process was modeled and simulated by Aspen Plus software.The modified hydrogen sulfide circulation process and methanol-water double-effect distillation were used to reduce energy consumption,while the technological parameters of reaction and separation units were optimized by sensitivity analysis.The simulation results showed that the desulfurization ratio was extremely high.It is a novel technology with potential industrial application prospect to treat sulfur-containing waste gas.