Thermodynamic evaluation on the chemical looping co-gasification performances of Cr-containing tannery sludge and waste surgical mask

IF 3.5 4区工程技术 Q3 ENERGY & FUELS

Biomass Conversion and Biorefinery Pub Date : 2024-09-19 DOI:10.1007/s13399-024-06132-w

Congxi Tao, Hao Wang, Jiazhi Yin, Qian Liang, Ming Wang, Qingmei Li, Xudong Wang

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Abstract

Clean disposal of Cr-containing tannery sludge (CTS) is a serious environmental issue because the high-content Cr is easily oxidized to toxically hexavalent. To realize the waste to energy, the CTS is used for syngas production via chemical looping co-gasification (CLCG) co-feeding with the waste surgical mask (WSM). The thermodynamic analysis is adopted to analyze the syngas’ quality, the chromium’s fate, and the N-, Cl-, and S-containing gaseous products under different gasification temperatures. Then, the effects of the mass flowrates of the steam, OC, and blending ratio of CTS in the feedstock are investigated. It is found that Cr in CTS can maintain trivalent chromium in the CLCG which is beneficial to the environment. Increasing gasification temperature can increase the Q_m from 11.44 to 13.43 MJ/kg. More steam in the gasification agent enhances the H₂ production and H₂/CO ratio in CLCG while increasing OC circulation rate leads to the gasification towards combustion.

Graphical abstract

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含铬制革污泥和废外科口罩化学循环共气化性能的热力学评估

含铬制革污泥（CTS）的清洁处置是一个严重的环境问题，因为高含量的铬很容易被氧化成有毒的六价铬。为实现变废为宝，制革污泥通过化学循环共气化（CLCG）与废弃手术面罩（WSM）共进料，用于生产合成气。采用热力学分析方法分析了不同气化温度下合成气的质量、铬的去向以及含 N、Cl 和 S 的气态产物。然后，研究了蒸汽质量流量、OC 和原料中 CTS 混合比例的影响。研究发现，CTS 中的铬能保持 CLCG 中的三价铬，这对环境有益。提高气化温度可将 Qm 从 11.44 MJ/kg 提高到 13.43 MJ/kg。气化剂中的蒸汽越多，CLCG 中的 H2 产量和 H2/CO 比率就越高，而 OC 循环速率越大，气化就越趋向于燃烧。

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来源期刊

Biomass Conversion and Biorefinery Energy-Renewable Energy, Sustainability and the Environment

CiteScore

7.00

自引率

15.00%

发文量

1358

期刊介绍： Biomass Conversion and Biorefinery presents articles and information on research, development and applications in thermo-chemical conversion; physico-chemical conversion and bio-chemical conversion, including all necessary steps for the provision and preparation of the biomass as well as all possible downstream processing steps for the environmentally sound and economically viable provision of energy and chemical products.