Sakuragi Kiyoshi, Otaka Maromu
Energy Engineering Research Laboratory, Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa-ken 240-0196, Japan.
ACS Omega. 2020 Aug 21;5(34):21722-21727. doi: 10.1021/acsomega.0c02629. eCollection 2020 Sep 1.
To increase the co-firing ratio of biomass in existing pulverized coal-fired power plants, biomass should be pulverized to obtain a particle size suitable for combustion. However, evaluation of the particle size distribution of each coal and biomass mixture via traditional fuel analysis is difficult. Because coal does not contain neutral sugars, the particle size distribution of biomass in the mixture can be estimated based on its neutral sugar content. The current study was conducted to evaluate the effect of biomass carbonization on the grinding process via neutral sugar analysis. Mixtures of coal and carbonized pine chips with three different degrees of carbonization were prepared and ground using a Hardgrove grindability index mill. In the pulverized mixtures of low carbonized biomass and coal, the biomass content at all particle size ranges was nearly the same as that of the input feedstock. As the degree of biomass carbonization increased, the biomass content in the mixture of large particle sizes was decreased, whereas it was increased in the mixture of small particle sizes. The current study indicated that particle size distribution of coal and biomass in the pulverized mixture depends on the degree of carbonization of biomass.
为提高现有煤粉发电厂中生物质的混烧比例，需将生物质磨碎以获得适合燃烧的粒径。然而，通过传统燃料分析评估每种煤与生物质混合物的粒径分布较为困难。由于煤不含中性糖，混合物中生物质的粒径分布可基于其中性糖含量来估算。本研究旨在通过中性糖分析评估生物质碳化对研磨过程的影响。制备了具有三种不同碳化程度的煤与碳化松木屑的混合物，并使用哈德格罗夫可磨性指数磨进行研磨。在低碳化生物质与煤的粉碎混合物中，所有粒径范围内的生物质含量与进料原料的含量几乎相同。随着生物质碳化程度的增加，大粒径混合物中的生物质含量降低，而小粒径混合物中的生物质含量增加。本研究表明，粉碎混合物中煤和生物质的粒径分布取决于生物质的碳化程度。
