Simulating municipal solid waste incineration with a DEM/CFD method – Influences of waste properties, grate and furnace design
Simulating municipal solid waste incineration with a DEM/CFD method – Influences of waste properties, grate and furnace design
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DOI：
10.1016/j.fuel.2017.06.037
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发表时间：
2017-10
期刊：
影响因子：
7.4
通讯作者：
F. Wissing;S. Wirtz;V. Scherer
中科院分区：
文献类型：
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作者：
F. Wissing;S. Wirtz;V. Scherer
本文提出了一种基于颗粒的方法（离散元法，DEM）模拟城市固体废物（MSW）在炉排上焚烧的初步方法。因此，一个内部的DEM代码已经耦合到FLUENT。模型已经制定了干燥，挥发物释放和焦炭转化。释放的挥发物在炉内废物床上方转化，这是用FLUENT计算的。在现有的城市生活垃圾焚烧厂的CO2，O2，H2O和床以上的温度的模拟与测量的比较。考虑到计量的不确定性和过程的复杂性，协议是公平的。在一项关于废物成分（热值，废物部分的数量），废物颗粒大小分布和辐射通量到废物床上的转换的影响的敏感性研究已经进行。最后，最常见的炉排系统，向后加煤，向前加煤和辊式炉排已被简要比较，包括不同类型的炉床上方的几何形状。结果表明，开发的方法提供了新的见解废物运动，废物转化和气相燃烧的复杂的相互作用的床上，不能得到与其他方法，如连续模型的废物床。
The current work presents an initial approach of using a particle based method (Discrete Element Method, DEM) to simulate municipal solid waste (MSW) incineration on grates. Therefore, an in-house DEM code has been coupled with FLUENT. Models have been formulated for drying, volatile release and char conversion. The volatiles released are converted in the furnace above the waste bed which has been calculated with FLUENT. A comparison of simulations with measurements in an existing MSW incineration plant of CO2, O2, H2O and temperatures above the bed is presented. Agreement is fair considering the measurement uncertainties and the complexity of the process. In a sensitivity study concerning the influence of waste composition (heating value, number of waste fractions), waste particle size distribution and radiative flux onto the waste bed on conversion has been carried out. Finally, the most common grate systems, backward stoking, forward stoking and roller grates have been compared briefly, including different types of furnace geometries above the bed. The results demonstrate that the approach developed gives new insight into the complex interaction of waste movement, waste conversion and gas phase combustion above the bed which can’t be obtained with other approaches, like continuum models for the waste bed.