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基于多孔介质非热平衡的方法,考虑了床层高度的下降和颗粒内部非等温的影响,建立了一维非稳态燃烧模型来模拟炉排上生物质床层的燃烧。模拟计算结果同实验值对比分析表明,模拟结果与实验结果吻合较好。通过对不同一次风参数下床层燃烧的模拟结果分析得到,随着一次风风量的增加,挥发分的析出速率不断降低,床层剩余质量先减小后增大;在燃烧前期,床层表面气体温度上升速度减慢,焦炭燃烧速率增大;在燃烧中期,床层表面气体温度先上升后下降,焦炭燃烧速率下降。一次风风温相比于一次风风量对床层燃烧的影响较小,增大一次风风温可以提高挥发分析出速率,减少床层剩余质量并且降低床层表面气体温度。
Based on the non-thermal equilibrium of porous media, a one-dimensional unsteady combustion model was established to simulate the combustion of the biomass bed in the grate, considering the decrease of the bed height and the non-isothermal effect inside the particle. The comparative analysis of simulation results with experimental values shows that the simulation results are in good agreement with the experimental ones. Through the analysis of simulation results of bed combustion under different primary wind parameters, with the increase of primary air volume, the precipitation rate of volatile matter continuously decreases and the residual mass first decreases and then increases. In the early stage of combustion, the bed surface Gas temperature rise slowed down, coke combustion rate increased; in the middle of combustion, the bed surface gas temperature rose first and then decreased, coke combustion rate decreased. The primary air temperature has a smaller effect on the combustion of the bed than the primary air volume. Increasing the air temperature can increase the rate of volatile analysis, reduce the residual mass of the bed and lower the surface gas temperature.