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Numerical and experimental studies on effects of moisture content on combustion characteristics of simulated municipal solid wastes in a fixed bed

机译：含水量对固定床模拟城市固体废物燃烧特性影响的数值和实验研究

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摘要

In order to reveal the features of the combustion process in the porous bed of a waste incinerator, a two-dimensional unsteady state model and experimental study were employed to investigate the combustion process in a fixed bed of municipal solid waste (MSW) on the combustion process in a fixed bed reactor. Conservation equations of the waste bed were implemented to describe the incineration process. The gas phase turbulence was modeled using the κ-ε. turbulent model and the particle phase was modeled using the kinetic theory of granular flow. The rate of moisture evaporation, devolatilization rate, and char burnout was calculated according to the waste property characters. The simulation results were then compared with experimental data for different moisture content of MSW, which shows that the incineration process of waste in the fixed bed is reasonably simulated. The simulation results of solid temperature, gas species and process rate in the bed are accordant with experimental data. Due to the high moisture content of fuel, moisture evaporation consumes a vast amount of heat, and the evaporation takes up most of the combustion time (about 2/3 of the whole combustion process). The whole bed combustion process reduces greatly as MSW moisture content increases. The experimental and simulation results provide direction for design and optimization of the fixed bed of MSW.
机译：为了揭示垃圾焚烧炉多孔床燃烧过程的特点，采用二维非稳态模型和实验研究方法，研究了城市固体垃圾固定床燃烧过程中的燃烧过程。在固定床反应器中进行处理。利用废物床的养护方程式来描述焚烧过程。气相湍流使用κ-ε建模。湍流模型和粒子相使用颗粒流动力学理论建模。根据废物的特性，计算出水分蒸发率，脱挥发分率和焦炭烧尽率。然后将模拟结果与不同城市固体废物含水量的实验数据进行比较，表明合理地模拟了固定床废物的焚烧过程。床内固体温度，气体种类和处理速率的模拟结果与实验数据吻合。由于燃料中水分含量高，水分蒸发会消耗大量热量，并且蒸发会占用大部分燃烧时间（大约占整个燃烧过程的2/3）。随着城市固体垃圾含水量的增加，整个床层燃烧过程大大减少。实验和仿真结果为城市固体垃圾固定床的设计和优化提供了方向。

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