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O_2/CO_2气氛下煤/生物质混燃特性实验研究 被引量:9

Experimental study on co-firing characteristics of coal/biomass blends in O_2/CO_2 atmosphere
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摘要 采用热重分析仪分别研究了不同煤种(烟煤、贫煤、无烟煤)与生物质(稻壳)的混燃特性,分析了燃烧气氛(O_2/CO_2、O_2/N_2)、生物质掺混比例、氧体积分数对煤与生物质混燃的着火温度、燃尽温度和综合燃烧特性以及动力学特性的影响。结果表明:1)在O_2/CO_2与O_2/N_2气氛下,煤与生物质混燃的失重变化趋势相似;但在O_2/CO_2气氛下,煤与生物质混燃的失重速率和固定碳燃烧反应活化能均低于O_2/N_2气氛,综合燃烧特性较O_2/N_2气氛差;2)掺混生物质可以改善单煤的燃烧特性,相比于单煤,煤与生物质混燃的着火温度和燃尽温度降低,煤粉的燃烧特性有所改善;3)随着生物质掺混比例的增加,煤与生物质混燃特性进一步得到改善;4)氧体积分数提高,煤与生物质的混燃速率增大,其着火和燃尽温度降低,综合燃烧特性改善,但在煤的固定碳燃烧阶段,燃烧反应活化能和指前因子增大;5)在煤的固定碳最大燃烧速率对应温度附近,混合燃料反应活化能小于单煤燃烧反应活化能,随着生物质掺混比例的增加,混合燃料反应活化能进一步减小。 Co-firing characteristics of different types of coal (bitumite, lean coal, anthracite) and biomass (rice husks) blends were studied using thermogravimetric analyzer. The influence of the combustion atmosphere (O2/CO2 O2/N2), bio-blending ratio and oxygen concentration on ignition temperature, burnout temperature, comprehensive combustion characteristics and kinetic property of the blends were investigated. The results show that, the mass loss rate trend of the blends in O2/N2 atmosphere was similar to that in O2/CO2 atmosphere, but in O2/CO2 atmosphere, the weight loss rate of the blends was faster, the activation energy of the fixed carbon was higher, and the comprehensive combustion characteristic index was lower. Co-firing with biomass could improve the combustion characteristics of pure coal. Compared with burning coal only, the ignition and burnout temperature of the coal- biomass blends decreased, indicating the combustion characteristics of the coal were enhanced. With the increasing bio-blending ratio, the co-combustion performance was improved further. By increasing the oxygen concentration, the co-combustion rate speeded up, the ignition and burnout temperature declined, and the comprehensive combustion characteristics became better. However, in the fixed carbon combustion stage, the activation energy and pre-exponential factor of the combustion reaction increased. Near the temperature corresponding to the maximum burning rate of fixed carbon, the activation energy of the co-combustion was lower than that of the only-coal combustion, and with the increasing proportion of biomass, the activation energy of the blended fuel reduced.
出处 《热力发电》 CAS 北大核心 2017年第4期16-21,38,共7页 Thermal Power Generation
基金 国家自然科学基金项目(51676076)~~
关键词 生物质 混燃 O2/CO2 热重分析 燃烧特性 coal, biomass, co-firing, O2/CO2, thermogravimetric analysis, combustion characteristics
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