生物质焦与煤混合燃烧特性实验及动力学研究

Experimental Investigation and Kinetic Analysis of the Co-Combustion Characteristics of Biomass Char and Coal Blends

摘要: 目的：探究不同掺量下生物质焦与煤混合燃料的燃烧特性，分析混合燃料的动力学特性，为筛选最优配比的混合燃料奠定基础。方法：选取玉米秸秆、锯末、花生秸秆作为主要生物质原料，以烟煤为主要煤炭原料，对实验原料开展元素分析与工业分析，并配备多种分析仪器与实验设备，随后开展实验测试。设定生物质焦与煤混合燃料的配比方案，利用高温管式炉进行混合燃料的制备。制备过程中，先对生物质原料进行热解反应，再将其与煤粉混合，得到混合燃料，随后进行成型处理，最终获得混合燃料样品。分别对样品进行燃料特性分析和动力学分析，记录其分析过程的相关数据。结果：在对生物质焦与煤混合燃料的燃烧特性分析时，H004实验组总热量析出为127.92 kW/kg；在对生物质焦与煤混合燃料进行动力学分析时，H004实验组在转化率为0.6时，活化能数值达到最大，为249.29 kJ/mol。结论：生物质焦含量为60%、烟煤含量为40%时，得到的混合燃料在实际应用中的燃烧性能最好，能够析出最多的热量。

Abstract: Objective: To investigate the combustion characteristics and kinetic properties of biomass char-coal blended fuels across different mixing ratios, providing a basis for identifying the optimal fuel blend formulation. Methods: Corn straw, sawdust, and peanut straw were selected as primary biomass feedstocks and bituminous coal as the primary coal feedstock. The experimental materials underwent elemental and industrial analysis. Utilizing various analytical instruments and experimental setups, a series of tests was conducted. Blending schemes for biomass char and coal mixtures were designed, and the blended fuels were prepared using a high-temperature tubular furnace. The preparation process involved pyrolysis of the biomass feedstock, followed by mixing with pulverized coal to form the blended fuel, which was then molded to obtain test samples. Fuel characteristic analysis and kinetic analysis were performed on the samples, with relevant data recorded throughout the procedures. Results: During the analysis of combustion characteristics of biomass char-coal blended fuels, the H004 experimental group exhibited a total heat release of 127.92 kW/kg. In the kinetic analysis of biomass char-coal blended fuels, the H004 group reached a maximum activation energy of 249.29 kJ/mol at a conversion rate of 0.6. Conclusion: The blended fuel comprising 60% biomass char and 40% bituminous coal demonstrated the best combustion performance in practical applications, yielding the highest heat release.