生物质成型燃料燃烧特性实验研究.pdfVIP

2009 年中国电机工程学会年会 生物质成型燃料燃烧特性的实验研究 张思佳 蔡丽红 湖北省电力勘测设计院 湖北武汉 430024 华北电力大学 河北保定 071003 Zhang Sijia Cai Lihong Dept.of Environmental Engineering, North China Electric Power University, Baoding 071003 摘要：以生物质成型燃料和煤粉作为实验燃料，在不同的燃烧时间和燃烧温度下 进行生物质纯烧和混烧的燃烧特性的研究。结果表明：生物质成型燃料在纯烧时 ，燃尽率较相同条件下的煤粉为低，这是由于生物质成型燃料由表面着火后，逐 步向内部燃烧，随着挥发分的析出和氧分内部扩散阻力的增大，剩余焦炭并没有 完全燃尽；而煤粉粒径较小，在同样的燃烧条件下却达到了相对较高的燃尽率。 生物质的加入很好的改善了煤的燃烧特性，且当煤和生物质按热量比为80%∶20 %时燃尽率最大，此混合比为最佳燃料混合比。延长燃烧时间，混合物的燃尽情 况也有所改善。生物质粒度对燃烧状况也有影响，生物质粒度越小，燃料与氧气 的接触面积就较大，燃烧越充分。 关键词：生物质燃料；燃烧特性；纯烧；混烧；成灰特性. [中图分类号]：X24 Experimental Study On Combustion Characteristics Of Biomass Briquettes Abstract Using biomass fuel and coal as experiment fuels, in different combustion time and combustion temperature, the combustion characteristics for pure burning of biomass and mixed burning will be studied. The results show that in pure burning cases, the burnout rate of the biomass is lower than coal under the same conditions. According to the analyzing result, it is due to the biomass burning starting from the surface after it is fired, and gradually to the internal combustion. With evaporating of the volatile matter and increasing of the internal diffusion resistance of oxygen, the residual coke is not completely burned up; while the particle size of coal is smaller, in the same combustion conditions, the coal has reached a relatively high burnout rate. The accession of the biomass is good to the improvement of the coal combustion characteristics, and when coal and biomass is mixed by thermal ratio 80% to 20%, the 2009.11.25-27 中国·天津 burn-off rate is the largest, proving that this mixture