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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical simulation of ash particles deposition in rectangular heat exchange channel
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Numerical simulation of ash particles deposition in rectangular heat exchange channel

机译：矩形热交换通道内灰粒沉积的数值模拟

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摘要

The flue gas of the coal-fired boiler is composed of a great number of fly ash particles. Such particles may easily form ash deposition on the heating surface of the heat exchanger when recovering the wasted heat energy from the flue gas. Here, we study the deposition of gas-side fly ash particles on the heating surface in a three-dimensional rectangular heat transfer channel by a numerical simulation method. First, the critical deposition velocity is calculated using the user-defined function (UDF) and the deposition process of the ash particles are simulated using the discrete phase model (DPM). Then, the rationality of the proposed method is verified by comparing the simulation results with the experimental data. In addition, we investigate the effects of the inlet velocities and particle diameters on the deposition efficiency of each wall of the rectangular channel. The results show that the particle deposition efficiency of different locations of the channel, i.e., the floor, the two sidewalls, and the ceiling, may be varied by the changing the particle diameter and the flow velocity. Moreover, we show that for a large particle, the ceiling and sidewalls, respectively, the first and second lowest particles deposition efficiency, while the floor exhibits the largest particles deposition efficiency. (C) 2019 Elsevier Ltd. All rights reserved.
机译：燃煤锅炉的烟道气由大量的飞灰颗粒组成。当从烟道气中回收浪费的热能时，这样的颗粒可能容易在热交换器的加热表面上形成灰烬沉积。在此，我们通过数值模拟方法研究了气态粉煤灰颗粒在三维矩形传热通道中在加热面上的沉积。首先，使用用户定义函数（UDF）计算临界沉积速度，并使用离散相模型（DPM）模拟灰分颗粒的沉积过程。然后，通过将仿真结果与实验数据进行比较，验证了该方法的合理性。此外，我们研究了入口速度和粒径对矩形通道各壁沉积效率的影响。结果表明，通道的不同位置，即地板，两个侧壁和顶板的颗粒沉积效率可通过改变粒径和流速而变化。此外，我们表明，对于大颗粒，顶棚和侧壁分别是第一和第二最低的颗粒沉积效率，而地板则表现出最大的颗粒沉积效率。 （C）2019 Elsevier Ltd.保留所有权利。

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