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Hydrogen-rich syngas production via sorption-enhanced steam gasification of sewage sludge

机译：富含氢合成气的污水污泥的吸附增强蒸汽气化

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摘要

Thermal conversion is an effective non-traditional method for sewage sludge disposal. Herein, the application of sorption-enhanced steam gasification to sewage sludge treatment is experimentally investigated to generate hydrogen-rich syngas in a fixed bed setup. The main aim was to determine the optimal conditions and suitable sorbents for this process. CaO was selected as the sorbent, and different CaO sorbents were prepared via the sol-gel method. Al_2O_3, La_2O_3, and ZrO_2 were used as support materials for CaO to enhance the sorbent activity and stability. The CO_2 capture capacities and stabilities of the sorbents over multiple cycles were examined. Additionally, different metal additives including CoO, MgO, and CeO_2 were combined with the sorbent to increase the hydrogen mole fraction and gas yield. The integration of the support material increased the stability of the sorbents over multiple cycles. High temperature increased the syngas yield and cold gas efficiency but decreased the hydrogen mole fraction. In comparison to CaO-La and CaO-Zr, CaO-Al afforded a higher hydrogen mole fraction and yield. Moreover, as Al_2O_3 is cheaper than La_2O_3 and ZrO_2, it was selected as the most suitable support material for CaO, considering both its performance and cost. Transition metal Co was also investigated as a catalyst for gasification. A high Co loading ratio improved the hydrogen yield and cold gas efficiency but decreased the hydrogen mole fraction. These findings suggest that the CaO sorption-enhanced gasification to produce hydrogen-rich syngas is an appropriate method for sewage sludge disposal.
机译：热转换是一种有效的污水污泥处理方法。这里，通过实验研究了吸附增强蒸汽气化对污泥处理的污泥处理，以在固定床设置中产生富含氢的合成气。主要目的是确定该过程的最佳条件和合适的吸附剂。选择CaO作为吸附剂，通过溶胶 - 凝胶法制备不同的CaO吸附剂。 AL_2O_3，LA_2O_3和ZRO_2用作CAO的支撑材料，以增强吸附剂活性和稳定性。检查了CO_2在多个循环中吸附剂的捕获能力和稳定性。另外，与吸附剂相结合了不同的金属添加剂，包括COO，MgO和CeO_2，以增加氢摩尔分数和气体产率。载体材料的整合增加了多个循环的吸附剂的稳定性。高温提高了合成气产量和冷气效率，但降低了氢摩尔级分。与CaO-La和CaO-Zr相比，CaO-A1得到了更高的氢摩尔分数和产率。此外，由于AL_2O_3比LA_2O_3和ZRO_2便宜，所以选择作为CAO最合适的支持材料，考虑到其性能和成本。还研究过渡金属CO作为气化催化剂。高Co负载比改善了氢屈服和冷气效率，但氢气效率降低。这些研究结果表明，曹吸附增强的气化生产富含氢的合成气是污水污泥处理的适当方法。

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  • 来源
    《Biomass & bioenergy》 |2020年第7期|105607.1-105607.11|共11页
  • 作者

    Shiyi Chen; Zhenghao Zhao; Ahsanullah Soomro; Shiwei Ma; Mudi Wu; Zhao Sun; Wenguo Xiang;

  • 作者单位

    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China;

    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China;

    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China;

    School of Energy and Mechanical Engineering Nanjing Normal University Nanjing 210046 China;

    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China;

    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China;

    Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China;

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

    Sewage sludge; CaO sorbent; Hydrogen-rich syngas; Steam gasification; Sorption;

    机译：污水污泥;Cao sorbent;富含氢的合成气;蒸汽气化;吸附;

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