柱状生物质颗粒在回转干馏炉中的运动及导热特性

发布时间：2018-05-05 11:55

本文选题：柱状生物质颗粒 + 离散单元法　；参考：《化工进展》2017年11期

【摘要】：为探究柱状生物质颗粒在固体热载体(钢球颗粒)回转干馏炉(回转炉)内的运动及导热特性,采用离散单元法模拟了柱状生物质颗粒和钢球颗粒在回转炉中的运动和导热;分析了转速和生物质颗粒数量(钢球颗粒数量固定)对颗粒运动和导热的影响;探讨了颗粒在回转炉中的分布规律;用生物质颗粒的平均温度和温度标准差来评价钢球颗粒对生物质颗粒的加热速率和生物质颗粒温度分布的均匀程度。结果表明:在本文设定的工况下,颗粒在回转炉中可以分成3个区域,即左侧的单层钢球颗粒区、中间的颗粒混合区和右侧的生物质颗粒堆积区;单层钢球颗粒区的不稳定因素(不稳定区、不稳定线、不稳定空穴)诱发了此区的周期性塌落;颗粒的运动模式为阶梯模式;随着转速的升高,钢球颗粒的加热速率升高。在前20s,相较5r/min和25r/min,转速为15r/min时的生物质颗粒温度分布均匀性最差。
[Abstract]:In order to investigate the motion and thermal conductivity of columnar biomass particles in solid heat carrier (steel ball particles) rotary distillation furnace (rotary converter), the motion and heat conduction of columnar biomass particles and steel ball particles in rotary furnace were simulated by discrete element method. The effects of rotational speed and biomass particle number (fixed number of steel ball particles) on particle movement and heat conduction were analyzed, and the distribution of particles in rotary furnace was discussed. The average temperature and temperature standard deviation of biomass particles were used to evaluate the heating rate of steel ball particles to biomass particles and the uniformity of temperature distribution of biomass particles. The results show that the particles can be divided into three regions in the rotary furnace under the conditions set in this paper, that is, the single layer steel ball particle area on the left, the particle mixing zone in the middle and the biomass particle accumulation area on the right side. The unstable factors (unstable zone, unstable line, unstable hole) in the single layer steel ball region induce the periodic collapse of the zone, the moving mode of the particle is ladder mode, and the heating rate of the steel ball particle increases with the increase of rotational speed. In the first 20 s, compared with 5r/min and 25 r / min, the temperature distribution of biomass particles at 15r/min speed was the worst.
【作者单位】：东北电力大学油页岩综合利用教育部工程研究中心;
【基金】：教育部长江学者和创新团队发展计划(IRT13052) 吉林省自然科学基金(20150101033JC) 吉林市科技计划(201464044) 吉教科合字(2015-237)项目
【分类号】：TQ021

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