Optimization of combined washing and torrefaction pretreatment for improving fuel properties and combustion performance of rice straw

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2025-05-02 DOI:10.1016/j.biombioe.2025.107937

Chamini Lakshika Wickramarathna Dissanayake, Dilantha Thushara, Duleeka Sandamali Gunarathne

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Abstract

Combined washing and torrefaction of biomass have proven to be effective in addressing limitations such as low energy density, low bulk density, high moisture content, poor grindability, hygroscopic nature, and high ash content for the application of rice straw as an energy source. The objective of this research was to analyze and optimize the combined washing (water and acetic acid) and torrefaction of rice straw to upgrade the combustion properties. The findings showed that as the temperature increased, the solid yield decreased, with the highest percentage of mass loss (48 %) occurring at 300 °C. In contrast to oxygen content and energy yield, carbon content and higher heating value increased with the torrefaction temperature. Optimum conditions obtained from the combined washing and torrefaction are 30 min residence time, 246 °C, and 256 °C torrefaction temperature for acid-washed and water-washed rice straw samples respectively. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed the structural changes and reduction in intensity in chemical bonds after the washing and torrefaction pretreatment which implied good fuel properties of pretreated rice straw. Acid-washed torrefied rice straw showed the best ignition index (D_i - 2.19 × 10⁻² wt%/min³), burnout index (D_b - 7.86 × 10⁻³ wt%/min³), and comprehensive combustion index (S - 5.5 × 10⁻⁷ min⁻² °C⁻³) compared to both raw rice straw and coal.

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改善稻草燃料性能和燃烧性能的水洗-焙烧联合预处理优化

生物质的联合洗涤和焙烧已被证明是有效的解决限制，如低能量密度，低堆积密度，高水分含量，较差的可磨性，吸湿性和高灰分稻秸秆作为能源的应用。本研究的目的是分析和优化稻秆水洗（水和醋酸）和焙烧的组合工艺，以提高稻秆的燃烧性能。结果表明，随着温度的升高，固体产率下降，300℃时质量损失率最高（48%）。与氧含量和产能相反，碳含量和更高的热值随着焙烧温度的升高而增加。对酸洗稻秆和水洗稻秆样品的最佳焙烧条件为停留时间30 min，焙烧温度246℃，焙烧温度256℃。傅里叶变换红外光谱（FTIR）分析表明，经过洗涤和焙烧预处理后，稻草的结构发生了变化，化学键强度降低，表明预处理后的稻草具有良好的燃料性能。与原稻秆和煤相比，酸洗稻秆的着火指数（Di - 2.19 × 10−2 wt%/min3）、燃尽指数（Db - 7.86 × 10−3 wt%/min3）和综合燃烧指数（S - 5.5 × 10−7 min−2°C−3）最好。

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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.