使用铁/铝氧载体对城市污泥进行化学循环气化过程中合成气生成的研究与优化

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-09-27 DOI:10.1016/j.joei.2024.101844
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引用次数: 0

摘要

为了减少碳排放,必须将市政污泥作为一种资源加以利用,而不是随意丢弃,尤其是目前的污泥处置方法存在脱水能耗高和二次污染等问题。本研究以 Al2O3 颗粒为载体,Fe(NO3)3-9H2O 为前驱体,制备了铁/铝复合氧载体(FOCs)。在装有 FOC 的固定床反应器中对湿市政污泥进行了化学循环气化(CLG),并采用多种方法分析了反应参数和条件对 FOCs 和合成气生成特性的影响。结果表明,水蒸气参与气化反应显著提高了污泥气化的产氢率,避免了 FOC 的过度还原。污泥释放出的水蒸气大大提高了污泥的热转化效率。在第一阶段,较高的温度有利于气化反应的进行,但当反应温度达到 900 ℃ 时,FOC 轻微烧结,反应气氛受到影响,合成气中的氢比例开始下降。控制 FOC 与污泥的混合比(O/H)是制备高质量合成气的重要影响因素。当 O/H 大于 0.25 时,合成气的质量明显下降。本研究得出的结论可指导利用 FOCs 制备富氢合成气的湿污泥 CLG 反应条件的选择。
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Investigation and optimization of syngas generation during chemical looping gasification of municipal sludge using Fe/Al oxygen carrier
To contribute to the reduction of carbon emissions, municipal sludge has to be utilized as a resource instead of being disposed of, especially since current sludge disposal methods encounter problems such as high dehydration energy consumption and secondary pollution. In this study, Fe/Al composite oxygen carriers (FOCs) were prepared using Al2O3 particles as carriers and Fe(NO3)3·9H2O as a precursor. Chemical looping gasification (CLG) of wet municipal sludge was conducted in a FOC-loaded fixed bed reactor, and the effect of reaction parameters and conditions on FOCs and syngas generation characteristics were analyzed by various methods. The results showed that the participation of water vapor in the gasification reaction significantly improved the hydrogen production rate of sludge gasification and avoided the over-reduction of the FOC. The vapor released from sludge significantly improved the thermal conversion efficiency of the sludge. Higher temperatures were conducive to the gasification reaction in the first stage, but when the reaction temperature reached 900 °C, the FOC slightly sintered, the reaction atmosphere was affected, and the hydrogen ratio in syngas started decreasing. Controlling the mixing ratio of FOC to sludge (O/H) was an important influencing factor for preparing high-quality syngas. When O/H was higher than 0.25, the quality of syngas decreased significantly. The conclusions obtained in this study can guide the selection of reaction conditions for the CLG of wet sludge using FOCs to prepare hydrogen-rich syngas.
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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