Abstract The erosion process of the low temperature economizer (LTE) caused by the impact of the solid dust particles is numerically investigated using coupled computational fluid dynamics-discrete particle method. The coupled model is first validated via the experimental data of gas-solid flows in a square bend made from steel, liquid-solid flows in three sharp elbows made from 13% chrome steel, 25% chrome steel and Inconel 718 and gas-solid flows in a round bend made from aluminium, respectively. Then, numerical simulations are conducted on the LTE and the effects of the key parameters on the erosion process are discussed. The results show that the flue gas corridor plays a key role in affecting the erosion on the LTE. The erosion on the pipe system along the flow direction can mainly be divided into three regions containing a valley, a peak and a constant value with fluctuations, respectively. The division of the three regions is not influenced by the gas velocity or mass fraction, however, it can be very sensitive to particle size. Meanwhile, the exact degree of erosion increases with gas velocity, mass fraction and particle size. Finally, methods are proposed to reduce the erosion on the LTE by optimizing the pipe structure as well as the flue gas corridor.

中文翻译：

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计算流体动力学-离散粒子法对低温省煤器冲蚀过程的数值研究

摘要 采用计算流体动力学-离散粒子耦合法，数值研究了固体尘埃粒子冲击对低温省煤器(LTE)的侵蚀过程。该耦合模型首先通过钢制方形弯管中的气固流动、13%铬钢、25%铬钢和Inconel 718制成的三个尖头弯头中的液固流动和气固流动的实验数据进行验证。分别在一个由铝制成的圆形弯曲处。然后，对LTE进行了数值模拟，讨论了关键参数对侵蚀过程的影响。结果表明，烟气廊道在影响对LTE的侵蚀方面起着关键作用。沿流动方向对管道系统的侵蚀主要可分为三个区域，其中一个是山谷，一个是 一个峰值和一个恒定值，分别有波动。这三个区域的划分不受气体速度或质量分数的影响，但是，它可能对粒度非常敏感。同时，侵蚀的确切程度随着气体速度、质量分数和颗粒尺寸而增加。最后，提出了通过优化管道结构和烟气走廊来减少对LTE的侵蚀的方法。