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首页> 外文期刊>International journal of hydrogen energy >Enhanced hydrogen-rich gas production from steam gasification of coal in a pressurized fluidized bed with CaO as a CO_2 sorbent
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Enhanced hydrogen-rich gas production from steam gasification of coal in a pressurized fluidized bed with CaO as a CO_2 sorbent

机译：在CaO作为CO_2吸附剂的加压流化床中，通过煤的蒸汽气化来提高煤的富氢气体产量

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摘要

Steam gasification of a typical Chinese bituminous coal for hydrogen production in a lab-scale pressurized bubbling fluidized bed with CaO as CO_2 sorbent was performed over a pressure range of ambient pressure to 4 bar. The compositions of the product gases were analyzed and correlated to the gasification operating variables that affecting H_2 production, such as pressure (P), mole ratio of steam to carbon ([H_2O]/[C]), mole ratio of CaO to carbon ([CaO]/[C]) and temperature (T). The experimental results indicated that the H_2 concentration was enhanced by raising the temperature, pressure and [H_2O]/[C] under the circumstances we observed. With the presence of CaO sorbent, CO_2 in the production gas was absorbed and converted to solid CaCO_3, thus shifting the steam reforming of hydrocarbons and water gas shift reaction beyond the equilibrium restrictions and enhancing the H_2 concentration. H_2 concentration was up to 78 vol% (dry basis) under a condition of 750 ℃, 4 bar, @@[Ca]/[C] = 1 and [H_2O]/[C] = 2, while CO_2 (2.7 vol%) was almost in-situ captured by the CaO sorbent. This study demonstrated that CaO could be used as a substantially excellent CO_2 sorbent for the pressurized steam gasification of bituminous coal. For the gasification process with the presence of CaO, H_2-rich syngas was yielded at far lower temperatures and pressures in comparison to the commercialized coal gasification technologies. SEM/ EDX and gas sorption analyses of solid residues sampled after the gasification showed that the pore structure of the sorbent was recovered after the steam gasification process, which was attributed to the formation of Ca(OH)_2. Additionally, a coal-CaO-H_2O system was simulated with using Aspen Plus software. Calculation results showed that higher temperatures and pressures favor the H_2 production within a certain range.
机译：在环境压力至4 bar的压力范围内，在CaO作为CO_2吸附剂的实验室规模加压鼓泡流化床中，对典型的中国烟煤进行蒸汽气化以制氢。分析了产物气的组成并将其与影响H_2产生的气化操作变量相关联，例如压力（P），蒸汽与碳的摩尔比（[H_2O] / [C]），CaO与碳的摩尔比（ [CaO] / [C]）和温度（T）。实验结果表明，在我们观察到的情况下，通过提高温度，压力和[H_2O] / [C]可以提高H_2的浓度。在存在CaO吸附剂的情况下，生产气中的CO_2被吸收并转化为固体CaCO_3，从而使烃类的蒸汽重整和水煤气变换反应超出了平衡限制，并提高了H_2的浓度。在750℃，4 bar，@@ [Ca] / [C] = 1和[H_2O] / [C] = 2的条件下，H_2的浓度最高可达78 vol％（干基）。 ）几乎被CaO吸附剂原位捕获。这项研究表明，CaO可用作烟煤加压蒸汽气化的基本优异的CO_2吸附剂。对于具有CaO的气化过程，与商业化的煤气化技术相比，在低得多的温度和压力下可产生富H_2的合成气。气化后采样的固体残留物的SEM / EDX和气体吸附分析表明，蒸汽气化过程后吸附剂的孔结构得以恢复，这归因于Ca（OH）_2的形成。此外，使用Aspen Plus软件模拟了煤-CaO-H_2O系统。计算结果表明，较高的温度和压力在一定范围内有利于H_2的产生。

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  • 来源
    《International journal of hydrogen energy》 |2014年第11期|5781-5792|共12页
  • 作者

    Qinhui Wang; Nai Rong; Hongtao Fan; Yongjie Meng; Mengxiang Fang; Leming Cheng; Kefa Cen;

  • 作者单位

    State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China;

    State Key Laboratory of Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Coal; Gasification; Hydrogen; Calcium looping; In-situ CO_2 capture; Pressurized fluidized bed;

    机译：煤;气化;氢;钙循环;原位CO_2捕获;加压流化床;

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