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根据挟带流动反应器的特性,本文开发了新的描述其动量、质量和热量的传递模型.在温度范围为1200-2000K、氧气分压为0.21atm 条件下试验研究了三种粒度莱阳煤炭粒(42.5μm,67μm 和92.5μm)燃烧的化学反应动力学特性.同时,根据阿累尼乌斯理论和简单碰撞理论整理了试验数据.得到的阿累尼乌斯形式的莱阳煤燃烧速率为Q=4.232exp(-19.979×10~3/RTp)p_((0.5)g/cm~2·s最后还将模型的计算结果与传统的Field 模型和Smith 模型的计算结果进行了■比较.经分析比较可知.本文开发的新模型很好地表征了粉煤炭粒在挟带流动反应器中燃烧的化学反应动力学特性.其计算结果较之传统的Smith 模型的计算结果小得多;而与传统的Ficdl 模型的计算结果相比,高温时偏小,低温时偏大.
According to the characteristics of entrained flow reactor, a new transfer model describing its momentum, mass and heat was developed in this paper.At the temperature range of 1200-2000K and oxygen partial pressure of 0.21atm, three particle sizes of Laiyang coal pellets (42.5μm, 67μm and 92.5μm) .At the same time, according to the Arrhenius theory and the simple collision theory, the experimental data are arranged.The burning rate of the Aryangius-type Laiyang coal is Q = 4.232exp (-19.979 × 10 ~ 3 / RTp) p _ ((0.5) g / cm ~ 2 · s Finally, the calculation results of the model are compared with those of the traditional Field model and the Smith model. It is clear that the new model developed in this paper can well characterize the chemical reaction kinetics of pulverized coal particles burning in the entrained flow reactor.The calculation results are much smaller than those of the traditional Smith model, Compared with the calculated results of the Ficdl model, the temperature is lower at high temperature and larger at low temperature.