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本文通过搭建McKenna型燃烧系统研究生物质颗粒的燃烧特性。基于数字图像处理技术分别研究氧浓度、流量和颗粒尺寸对生物质颗粒燃烧特征和挥发分火焰特征的影响。研究表明,随着氧浓度的增加,生物质颗粒的着火延迟时间、挥发分燃烧时间和碳燃烧时间均呈现下降趋势。挥发分火焰时均面积随着氧浓度的增加而减小,挥发分火焰时均平均亮度随着氧浓度的增加而增加。流量对生物质颗粒燃烧特性的影响与氧浓度的影响相似,而颗粒长度对生物质颗粒燃烧特性的影响与氧浓度和流量的影响相反。
In this paper, McKenna-type combustion system is built to study the combustion characteristics of biomass particles. Based on digital image processing techniques, the effects of oxygen concentration, flux and particle size on the combustion characteristics and volatile flame characteristics of biomass particles were studied. The results showed that with the increase of oxygen concentration, the ignition delay time, volatile combustion time and carbon burning time of biomass particles showed a downward trend. The average area of volatile flames decreased with the increase of oxygen concentration. The mean average brightness of volatile flames increased with the increase of oxygen concentration. The effect of flow on the combustion characteristics of biomass particles is similar to that of oxygen concentration, and the effect of particle length on the combustion characteristics of biomass particles is opposite to that of oxygen concentration and flux.