在热解和燃烧过程中生物碳排放和风险评估
Bénit Bouesso1, Ronan Pelé1, María González Martínez1
1Université de Toulouse, IMT Mines Albi, RAPSODEE CNRS UMR 5302, Campus Jarlard, F.81013 Albi Cedex 09, France.
ACS omega
|October 13, 2025
概括
生物碳 (Biochar) 为化石燃料提供了一个可再生的替代品,但其排放,包括多环芳 (PAH),需要仔细评估. 这项研究分析了生物碳排放,发现虽然一些生物碳释放更多的PAH,但优化燃烧显著减少了有毒气体排放及其相关的健康风险.
科学领域:
- 环境科学与工程环境科学与工程
- 化学工程是化学工程的重要组成部分.
- 燃烧科学 燃烧科学
背景情况:
- 工业脱碳需要减少有毒气体排放,例如多环芳 (PAH).
- 生物碳 (Biochar) 是化石燃料的可再生替代能源,由于其特性和生物排放.
- 了解热解和燃烧过程中生物碳的气体排放的命运和毒性对于其工业应用至关重要.
研究的目的:
- 为了确定燃烧和燃烧过程中生物碳的气体排放量 (CO,CO2,H2,CH4,PAH).
- 为了将排放因子 (EF) 与生物碳的物理化学特征相关联,例如挥发物质 (VM) 含量.
- 使用毒性等效系数 (TEQ) 将生物碳排放的毒性与化石燃料的毒性进行比较.
主要方法:
- 热解和燃烧实验对来自固体废物燃料的生物碳 (BC1) 和两种具有不同VM含量的木制生物碳 (WBC1,WBC2) 进行.
- 永久气体和PAH的排放因子 (EF) 根据燃料特性计算.
- 毒性等效因子 (TEQ) 通过评估释放的PAH的致癌潜力和产量来确定.
主要成果:
- 生物碳排放因子与VM含量和无机成分直接相关.
- 高VM生物碳 (WBC1) 的二氧化碳排放因子较高,但符合CH4+H2.2的标准.
- 虽然高VM生物碳释放的PAH毒性较低,但其总体PAH排放因子和TEQ比化石燃料高;然而,优化燃烧大大减少了排放和PAH形成.
结论:
- 生物碳的物理化学特性在热化学转化过程中显著影响其气体排放.
- 优化生物碳的燃烧可以大幅减少可冷凝物种,永久性气体排放,并消除PAH,从而降低毒性.
- 生物碳是化石燃料的可行可再生替代品,前提是有效实施排放控制战略.
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