A parametric study of particle size influence on sewage sludge-derived hydrochar and coal char co-gasification: Reactivity and carbon conversion analysis

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING Biomass & Bioenergy Pub Date : 2025-05-01 Epub Date: 2025-02-22 DOI:10.1016/j.biombioe.2025.107715

Azhar Ali Laghari , Asma Leghari , Akash Kumar , Lata Kumari , Muhammad Rizwan , Qurat-ul-ain Abro , Memon Kashif Ali , Yongheng Shen , Qingxia Guo

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Abstract

Sewage sludge (SS) poses significant environmental and socio-economic challenges due to its high moisture content and limited disposal options. Hydrothermal carbonization (HTC) has been identified as an effective pretreatment method to enhance the stability and reactivity of hydrochar (HC) for energy applications. This study investigates the co-gasification behavior of pyrolyzed HC derived from SS and coal char in CO2 environments, with a focus on the influence of temperature (850 °C, 900 °C, and 950 °C) and particle size (35 μm, 110 μm, 250 μm, and 430 μm) on gasification reactivity and carbon conversion. Experimental results show that smaller particles (35 μm) exhibited the highest reactivity due to their larger surface area-to-volume ratio, achieving a gasification rate of 0.010945 s⁻¹ at 950 °C. Increasing the temperature significantly enhanced carbon conversion, with conversion rates accelerating particularly at 950 °C during the initial phases. Coal char demonstrated rapid thermal degradation, while HC displayed superior thermal stability and reduced reactivity at higher temperatures due to its more condensed carbon structure. Notably, HC concentrations (15 %) improved overall reactivity compared to lower concentrations (5 %), emphasizing the synergistic effects of co-gasification. This study highlights the critical role of temperature and particle size in optimizing waste-to-energy conversion processes, offering actionable insights for enhancing efficiency and sustainability in waste management systems.

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粒度对污水污泥衍生的水炭和煤炭联合气化影响的参数研究：反应性与碳转化分析

污水污泥（SS）由于其高水分含量和有限的处理方案，对环境和社会经济构成了重大挑战。水热碳化（HTC）已被确定为一种有效的预处理方法，以提高稳定性和反应性的碳氢化合物（HC）的能源应用。本研究研究了SS和煤焦热解HC在CO2环境下的共气化行为，重点研究了温度（850℃、900℃和950℃）和粒径（35 μm、110 μm、250 μm和430 μm）对气化反应性和碳转化率的影响。实验结果表明，较小的颗粒（35 μm）由于其更大的表面积体积比而表现出最高的反应活性，在950°C时达到0.010945 s的气化速度。升高温度显著提高了碳的转化率，特别是在初始阶段的950℃时，转化率加快。煤焦表现出快速的热降解，而HC表现出优异的热稳定性，由于其碳结构更凝聚，在高温下反应性降低。值得注意的是，与较低浓度（5%）相比，HC浓度（15%）提高了总体反应性，强调了共气化的协同效应。这项研究强调了温度和颗粒大小在优化废物转化为能源过程中的关键作用，为提高废物管理系统的效率和可持续性提供了可行的见解。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.