藏东南典型生物质及其掺混样品燃烧特性及动力学分析
Combustion characteristics and kinetic analysis of typical biomass and its mixed samples in southeastern Xizang
为给西藏农村经济建设和生态文明建设提供能源支持,采用热重分析方法研究了藏东南地区牛粪、玉米秸秆及其掺混样品的燃烧特性,采用Coats-Redfern积分法研究其动力学特性。结果表明,牛粪和玉米秸秆生物质燃烧过程总体趋势一致,共分为4个阶段,生物质挥发分析出与燃烧是主要燃烧阶段,失重占比最大;提高升温速率会使生物质燃烧速度增大,失重峰值增大;采用TG-DTG联合定义法对牛粪、玉米秸秆及其掺混生物质燃烧特性进行分析,根据综合燃烧特性指数,玉米秸秆的燃烧特性好于所有掺混样品且大于牛粪;各样品燃烧反应活化能从低到高分别为:牛粪52.19 kJ/mol、牛粪占比75%样品为47.70 kJ/mol、牛粪占比50%样品38.70 kJ/mol、牛粪占比25%样品35.23 kJ/mol、玉米秸秆33.09 kJ/mol。该研究为西藏地区多类型生物质能源燃烧利用效率提供了理论依据和技术支持。
In order to provide energy support for rural economic construction and ecological civilization construction in Xizang, the combustion characteristics of cow dung, corn straw and their blended samples in southeast Xizang were studied by thermogravimetric analysis (TGA), and their dynamic characteristics were studied by Coats-Redfern integral method.The results showed that the overall trend of biomass combustion in cow manure and corn stover was consistent, divided into four stages. Biomass volatilization analysis and combustion were the main combustion stages, with the highest proportion of weight loss; Increasing the heating rate will increase the biomass combustion rate and the peak weight loss; The TG-DTG joint definition method was used to analyze the combustion characteristics of cow manure, corn stover, and their blended biomass. According to the comprehensive combustion characteristic index, the combustion characteristics of corn stover were better than all blended samples and greater than cow manure; The activation energies of the combustion reaction of each sample, from low to high, are 52.19 kJ/mol for cow manure, 47.70 kJ/mol for cow manure with a proportion of 75%, 38.70 kJ/mol for cow manure with a proportion of 50%, 35.23 kJ/mol for cow manure with a proportion of 25%, and 33.09 kJ/mol for corn straw. This study provides a theoretical basis and technical support for the combustion and utilization efficiency of multi type biomass energy in Xizang.
biomass / mixing / thermogravimetric analysis / combustion characteristics / kinetics parameters
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