西藏三种木材生物质的燃烧特性及动力学分析
Combustion Characteristics and Kinetic Analysis of Three Types of Wood Biomass in Tibet
为了探讨西藏地区丰富的藏川杨、高山松和川滇高山栎3种木材生物质在燃烧过程中的反应机理,采用热重分析了三种木材的燃烧特性,通过Coats-Redfern积分法研究了其动力学特性。结果表明:3种木材生物质燃烧过程总体趋势一致,可分为失水干燥、生物质燃烧、焦炭燃烧和生物质燃尽共4个阶段,其中挥发分燃烧阶段失重占比最大。根据综合燃烧特性指数,川滇高山栎的燃烧特性最好,其次是藏川杨、高山松;随着升温速率增大,木材生物质的综合燃烧特性指数增大,燃烧速率增大,DTG曲线峰值增大,峰形变宽;藏川杨、高山松和川滇高山栎的最佳反应级数分别为1、2、2,相关系数均大于0.95。燃烧反应活化能从低到高分别为:藏川杨46.10 kJ/mol、高山松70.05 kJ/mol、川滇高山栎85.59 kJ/mol;频率因子从低到高依次为:藏川杨2.25×104 min-1、高山松3.99×106 min-1、川滇高山栎2.14×107 min-1,该研究为优化燃烧过程和提高能源利用效率提供了理论依据。
In order to examine the combustion characteristics of three types of wood biomass, namely Populus szechuanica var. tibetica Schneid, Pinus densata Mast, and Pinus densata Mast in the Tibetan region, thermogravimetric analysis is employed to investigate their combustion behavior, while their kinetic properties are studied using the Coats-Redfern non-isothermal integration method. The findings reveal a consistent overall trend in the combustion process of these three wood biomasses, which can be divided into four stages: water loss and drying, biomass combustion, coke combustion, and complete biomass combustion. The stage involving the combustion of volatile components exhibits the highest weight loss proportion. Based on the integrated combustion characteristic index, Pinus densata Mast demonstrates superior combustion characteristics, followed by Populus szechuanica var. tibetica Schneid and Pinus densata Mast. As the heating rate increases, the integrated combustion characteristic index of the wood biomass rises, resulting in increased combustion rates and larger peaks in the DTG curve with broader peak shapes. The optimal reaction orders for Populus szechuanica var. tibetica Schneid, Pinus densata Mast, and Pinus densata Mast are found to be 1, 2, and 2, respectively, with correlation coefficients exceeding 0.95. The activation energies for combustion reactions range from lowest to highest as follows: 46.10 kJ/mol for Populus szechuanica var. tibetica Schneid, 70.05 kJ/mol for Pinus densata Mast, and 85.59 kJ/mol for Pinus densata Mast. Similarly, the frequency factors exhibit an increasing order from lowest to highest, namely 2.25×104 min-1 for Populus szechuanica var. tibetica Schneid, 3.99×106 min-1 for Pinus densata Mast, and 2.14×107 min-1 for Pinus densata Mast. This research provides a theoretical foundation for optimizing the combustion process and enhancing energy utilization efficiency.
biomass / thermogravimetric analysis / combustion characteristics / kinetics parameters
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