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A Simplified Model Accounting for the Combustion of Pulverized Coal Char Particles in a Drop Tube Furnace
Energy & Fuels ( IF 5.2 ) Pub Date : 2017-09-18 00:00:00 , DOI: 10.1021/acs.energyfuels.7b01756
Patrick Gilot 1 , Alain Brillard 1 , Jean-François Brilhac 1 , Cornelius Schönnenbeck 1
Affiliation  

A simple model is proposed, which predicts the evolutions versus time of the temperature and of the carbonaceous material conversion of a coal char particle during its combustion in a drop tube furnace under a very high heating rate of 1500 K/s. The values of the intrinsic reactivity parameters are obtained performing thermogravimetric analyses of the coal char particles in a thermobalance under a low heating rate of 10 K/min. In this simple model, the local evolutions of the particle porosity and density are not accounted for as only their mean values are considered at any time of the combustion process. The oxygen concentration gradient within the particle is accounted for, once a particle effectiveness factor related to the Thiele modulus is estimated. Comparisons between the experimental and simulated temperatures of the particle are performed for three regulation temperatures of the drop tube furnace, and the combustion regimes are analyzed in terms of the effectiveness factor of the particle.

中文翻译:

下落管式炉中煤粉燃烧的简化模型

提出了一个简单的模型,该模型预测了煤焦颗粒在滴管炉中在非常高的1500 K / s加热速率下燃烧过程中温度随时间的变化以及碳质材料转化的趋势。通过在10 K / min的低加热速率下以热天平对煤焦颗粒进行热重分析,获得了固有反应性参数的值。在这个简单的模型中,没有考虑颗粒孔隙率和密度的局部变化,因为在燃烧过程中的任何时间都仅考虑其平均值。一旦估计了与Thiele模量有关的颗粒效率因子,就说明了颗粒中的氧浓度梯度。
更新日期:2017-09-18
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