CN101516766A - 生产氢气的方法 - Google Patents
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Abstract
本发明公开了一种用于生产含烃原料的方法。在所述方法中,在添加含氧气体和水蒸气的条件下,在1200至1500℃的温度下和15至100巴abs的压力下,通过非催化性部分氧化,将原材料自热性地转变成原煤气,该原煤气含有作为主要成分的H2和CO,以及成分CO2、H2O、CH4及痕量的H2S、COS、CnHm、N2和Ar,然后通过添加水蒸气使所述原煤气中含有的CO转化成CO2和另外的H2。为了改进所述方法,在变压吸收方法中将所述转化的原合成煤气直接地,即不经除去CO2和H2S的洗涤过程,分离成高纯H2和含有H2S、CO2、H2、CO、CH4、Ar和N2的气体混合物,将所述气体混合物进料到硫回收工艺的尾气洗液中,将分离的H2S进料到所述硫回收工艺的工艺气体中,并使所述尾气洗液的废气燃烧,其中所述废气和所述硫回收工艺的尾气混合。
Description
技术领域
本发明涉及由烃质离析物,例如炼油厂残余物、石油、天然气、石油气、石油焦和煤,生产H2的方法,其中在第一反应阶段,通过在1200至1500℃的温度下和15至100巴abs的压力下添加含氧气体和水蒸气,通过非催化性部分氧化,将原材料自热性地气化,得到原煤气,该原煤气含有作为主要成分的H2和CO以及成分CO2、H2O、CH4及痕量的H2S、COS、CnHm、N2和Ar,并且借助于淬火将所述原煤气中含有的金属灰作为熔渣和烟灰一起除去,以及在第二反应阶段,通过添加水蒸气将所述原煤气中含有的CO转化成CO2和另外的H2。
背景技术
利用Lurgi AG,Frankfurt am Main的公司手册1700e/4.04/15所述的多用途气化法(MPG法),可以根据下列反应方程式,将很多种烃质液体、气体和固体原材料,例如炼油厂残余物、石油、天然气、石油气、化学废物、煤和石油焦,通过非催化性部分氧化而自热性地转化,得到基本上由H2和CO组成的原煤气:
2CHn+O2→2CO+nH2。
根据原材料的组成和氧气载体例如空气、富氧空气或者纯氧,气化温度是1200至1450℃,气化压力是1至100巴abs并且对于主要生产氢气的情况是30至70巴abs。除了期望的成分H2和CO之外,所得到的原煤气还含有成分CO2、H2O、CH4及痕量的H2S、COS、CnHm、N2和Ar。通过用水淬火,将所述原煤气中含有的金属灰作为熔渣和烟灰一起从该工艺中除去。将与水蒸气混合的氧气载体供应到所述气化装置的燃烧器。在第二反应阶段,根据下列反应方程式用水蒸气使所述原煤气中含有的CO转化,得到CO2和另外的H2:
以该方式产生的原合成煤气含有作为期望的成分的50至80体积%的H2和10至40体积%的CO2及作为不期望的成分的H2S、CO、COS、CH4和CnHm,其在两个阶段中借助于作为物理溶剂的负载有CO2的冷甲醇而被吸收。各种成分在甲醇中的溶解度相差很远,由此在20至80巴abs的压力下选择性分离所述成分例如H2S和CO2是可能的。输入的冷却的原合成煤气最初被供应到H2S吸收剂,并且H2S和其它含硫化合物被吸收,以致在所述合成煤气中硫的残余含量低于0.1ppm。为了再生,负载了H2S的甲醇膨胀到中等压力并随后加热到沸沸腾温度,从而使吸收的所有气体被释放。通过克劳斯法从富含H2S的气体中回收纯硫。在第二阶段中,从这种气体中分离CO2,从而使所述气体中的CO2浓度减少到10ppm至3体积%。根据方法,使负载了CO2的溶剂膨胀到低压,并且将释放的无硫CO2排放到大气中或者用于例如生产尿素。相关的方法包括其中采用N-甲基-2-吡咯烷酮(NMP)作为物理溶剂的所谓方法,以及其中利用聚乙二醇醚的混合物作为物理溶剂的方法。采用这两种方法,可以从所述原合成煤气中除去不期望的成分,残余含量低至<1ppm H2S和0.1至3体积%CO2。还可以借助于胺的水溶液利用胺洗方法例如方法,实现从所述原合成煤气中除去H2S和CO2。
通过采用变压吸收方法(Druckwechsel-Absorptions-Verfahrens),将除去CO2和H2S剩下的合成煤气分离为由高纯H2组成的部分和可以例如用作燃料气的含有残余成分的小部分。
取决于所述原料,在CO转化成CO2和另外的H2时形成的原合成煤气以高达40体积%含量的CO2的形式含有进料气体的几乎全部碳以及另外≤1体积%的H2S。从所述原合成煤气中选择性分离H2S而不同时分离主要量的CO2,需要相对大的技术努力。对于通过克劳斯法进一步处理富含H2S的相,选择性分离是必须的。通过变压吸收方法来实现剩余H2的最终净化。
发明内容
本发明的目的是,在通过上述方法由烃质离析物生产H2过程中,省略洗涤由转化产生的原合成煤气,其借助用于除去CO2和H2S的物理或者化学溶剂,离开第二反应阶段。
该目的的解决方案在于,在第三阶段通过变压吸收方法,将离开第二反应阶段的转化的原合成煤气分离成高纯H2和含有0.5至10体积%的H2S、50至95体积%的CO2、5至20体积%的H2、0.1至10体积%的CO和0.1至10体积%的CH4、Ar、N2的气体混合物,将该气体混合物供应到克劳斯法的尾气洗液中,将从所述气体混合物中选择性分离的H2S引入克劳斯法的进料气体中,并且将与克劳斯法的尾气混合的尾气洗液的脱硫废气燃烧。
本发明的一个方面在于将在克劳斯法尾气洗液的洗涤剂的再生过程中回收的H2S再循环到所述克劳斯法中,由此增加硫的收率。
对于在所述尾气洗液的脱硫废气的燃烧过程中得到的废气仍然含有痕量的H2S的情况,使所述废气经过二次燃烧。
便利地,为了产生水蒸气、加热等,将在所述克劳斯法尾气洗液的脱硫废气的燃烧过程中获得的热能转移给在热交换器中流动的低温流体。
具体实施方式
实施例
借助于实施方式连同简化的方块流程图,将详细解释本发明的方法。
残余油经导管(2)经布置在反应器顶部的燃烧器供应到连接淬火槽的内衬一层耐火材料的化学反应器(1)中,经导管(3)供应氧气和经导管(4)供应水蒸气。产生的原煤气通过位于反应器(1)底部的出口孔流入淬火槽,并通过侧面布置的排气口离开。刚一离开反应器(1),热的原煤气就通过将水注入淬火喷嘴直接冷却到饱和水蒸气温度。形成的液体炉渣经反应器壁流出并且在淬火槽中淬火。在玻璃状炉渣小球中,并入了重金属和不溶性化合物,它们经导管(5)排出。在50巴abs的气化压力和1350℃的气化温度下通过非催化性部分氧化产生的原煤气由45体积%的H2、45体积%的CO、5体积%的CO2和<1体积%的H2S组成,并且从淬火槽经导管(6)流入转化器(7),在该转化器中,CO和经导管(8)供应的水蒸气反应得到CO2和另外的H2。经导管(9)排出的含有62体积%的H2、35体积%的CO2、2体积%的CO和1体积%的H2S的原合成煤气被进料到变压吸收装置(10)中,在该装置中,原合成煤气在48巴abs的压力下被选择性分离成H2,该H2经导管(11)从变压吸收装置(10)中排出;及吸附在多孔材料上的剩余成分。一旦所述多孔材料完全负载,降低压力,并且回收由2体积%的H2S、78体积%的CO2、13体积%的H2、2体积%的CO、其余的CH4、N2、Ar组成的气体混合物。经导管(12),将所述气体混合物和克劳斯装置的尾气混合,并一起供应到克劳斯装置的尾气净化阶段(13),并且借助于经导管(14)流入的洗涤剂从气体混合物中选择性洗脱H2S。作为洗涤剂,典型地采用选择性活性化学洗涤剂,尤其是胺例如甲基二乙醇胺(MDEA)或立体位阻胺(Flexsorb)。在再生器中,洗涤剂从吸收的H2S以及其它气体成分中释放出来,并且所形成的具有相对高的H2S浓度的气体经导管(15)进料到来自其它工艺单元经导管(17)流入刀克劳斯装置(16)中的酸性气流中。剩余气体混合物与从克劳斯装置(16)流出经导管(18)进入到尾气净化阶段(13)的气体成分结合,并且经导管(19)流入燃烧装置(20)。
必定发现用本发明的方法特别取得的优点在于,通过转化产生的第二反应阶段的原合成煤气被直接进料到变压吸收工艺,以分离为高纯H2和含有CO2、H2、H2S、CO、CH4、N2和Ar的气体混合物,并在克劳斯法的尾气洗液中进行H2S从气体混合物中的分离。借助这种方法,可以省略转化的原合成煤气的物理和化学气体洗涤,并且因此用于由烃质离析物回收氢气的全套装置的投资成本可以减少大约20%。此外,通过采用本发明的方法避免了CO2排放。
Claims (4)
1.用于由烃质离析物生产氢气的方法,该烃质离析物例如炼油厂残余物、石油、天然气、石油气、石油焦和煤,其中在第一反应阶段,通过在1200至1500℃的温度下和15至100巴abs的压力下添加含氧气体和水蒸气,通过非催化性部分氧化,使原材料自热性地气化,得到原煤气,该原煤气含有作为主要成分的H2和CO以及成分CO2、H2O、CH4和痕量的H2S、COS、CnHm、N2和Ar,并且借助于淬火将在所述原煤气中含有的金属灰作为熔渣和烟灰一起除去,和在第二反应阶段,通过添加水蒸气将所述原煤气中含有的CO转化成CO2和另外的H2,其特征在于,在第三阶段,通过变压吸收方法将离开所述第二反应阶段的转化的原合成煤气分离成高纯H2和含有0.5至10体积%的H2S、50至95体积%的CO2、5至20体积%的H2、0.1至10体积%的CO和0.1至10体积%的CH4、Ar、N2的气体混合物,将该气体混合物供应到克劳斯法的尾气洗液中,将从所述气体混合物中选择性分离的H2S引入到克劳斯法的进料气体中,并且将与所述克劳斯法的尾气混合的尾气洗液的脱硫废气燃烧。
2.根据权利要求1所述的方法,其特征在于,将在所述克劳斯法的尾气洗液的洗涤剂的再生过程中回收的H2S再循环到所述克劳斯法中。
3.根据权利要求1和2中任一项所述的方法,其特征在于,将在所述尾气洗液的脱硫废气的燃烧过程中获得的热能转移给在热交换器中流动的低温流体。
4.根据权利要求1至3中任一项所述的方法,其特征在于,使在所述尾气洗液的脱硫废气的燃烧过程中获得的废气进行二次燃烧。
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CN102656112A (zh) * | 2009-12-16 | 2012-09-05 | 鲁奇有限责任公司 | 用于操作重整炉的方法和重整设备 |
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US11472924B2 (en) * | 2018-12-20 | 2022-10-18 | Gas Technology Institute | Methods and systems to decarbonize natural gas using sulfur to produce hydrogen and polymers |
EP3960728A1 (de) | 2020-08-24 | 2022-03-02 | Covestro Deutschland AG | Verfahren zur isocyanat-herstellung mit rezyklierender, thermisch oxidativer verwertung |
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CN102656112A (zh) * | 2009-12-16 | 2012-09-05 | 鲁奇有限责任公司 | 用于操作重整炉的方法和重整设备 |
CN102656112B (zh) * | 2009-12-16 | 2014-08-27 | 鲁奇有限责任公司 | 用于操作重整炉的方法和重整设备 |
CN102431971A (zh) * | 2010-07-27 | 2012-05-02 | 气体产品与化学公司 | 可调节地处理酸性气体的方法和装置 |
CN102431971B (zh) * | 2010-07-27 | 2014-10-29 | 气体产品与化学公司 | 可调节地处理酸性气体的方法和装置 |
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WO2008037315A2 (de) | 2008-04-03 |
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CA2663238A1 (en) | 2008-04-03 |
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