Sorption-catalysis-enhanced effects of crab shell derived CaO-based biochar addition on the pyrolysis of waste cooking oil fried sludge

IF 1.6 4区工程技术 Q3 Chemical Engineering

International Journal of Chemical Reactor Engineering Pub Date : 2024-02-08 DOI:10.1515/ijcre-2023-0107

Yanhua Li, Long Wu, Qing Xu, Zhanyong Li

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Abstract

In order to promote the yield and calorific value of combustible gas products in the pyrolysis, a CaO-based biochar (CSC) derived from waste crab shell was used as a low-cost sorption-enhanced catalyst to enhance oil-fried sludge (OS) pyrolysis. The effects of CSC addition and pyrolysis temperature on OS pyrolysis characteristics were analyzed in detail. The results indicated that adding CSC significantly enhanced OS pyrolysis and produced more combustible gas products with CO2 removal. At 700 °C, adding CSC promoted the combustible gas yields and greatly reduced CO2 by 96.9 %. And the corresponding LHV of pyrolysis gas products increased by 26.8 % and reached up to 33.7 MJ/N m3. Additionally, TG-FTIR analysis revealed that adding CSC reduced the formation temperature of CH4. Importantly, although there was only 35.5 wt% of Ca in CSC, CSC exhibited almost the same sorption-catalysis-enhanced effects compared to pure CaO. These findings suggest that biochar derived from crab shell has the potential to replace CaO for enhancing sludge pyrolysis into value-added fuel products.

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添加蟹壳衍生氧化钙生物炭对热解废弃食用油油炸污泥的吸附催化增强效应

为了提高热解过程中可燃气体产物的产量和热值，研究人员利用从废弃蟹壳中提取的氧化钙基生物炭（CSC）作为一种低成本的吸附增强催化剂，来促进油炸污泥（OS）的热解。详细分析了 CSC 添加量和热解温度对油炸污泥热解特性的影响。结果表明，添加 CSC 能明显促进油炸污泥热解，并产生更多的可燃气体产品，同时还能去除 CO2。在 700 °C 温度下，添加 CSC 能提高可燃气体的产量，并大大减少 CO2 的产生，降幅达 96.9%。热解气体产品的相应 LHV 增加了 26.8%，达到 33.7 MJ/N m3。此外，TG-FTIR 分析表明，添加 CSC 降低了 CH4 的形成温度。重要的是，虽然 CSC 中的钙含量仅为 35.5 wt%，但与纯 CaO 相比，CSC 表现出几乎相同的吸附催化增强效果。这些研究结果表明，从蟹壳中提取的生物炭有潜力取代 CaO，将污泥热解为高附加值的燃料产品。

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来源期刊

International Journal of Chemical Reactor Engineering 工程技术-工程：化工

CiteScore

2.80

自引率

12.50%

发文量

107

审稿时长

3 months

期刊介绍： The International Journal of Chemical Reactor Engineering covers the broad fields of theoretical and applied reactor engineering. The IJCRE covers topics drawn from the substantial areas of overlap between catalysis, reaction and reactor engineering. The journal is presently edited by Hugo de Lasa and Charles Xu, counting with an impressive list of Editorial Board leading specialists in chemical reactor engineering. Authors include notable international professors and R&D industry leaders.