The elbow erosion seriously jeopardizes the safe and stable operation of water–slag discharge pipeline of the coal gasification system. This work simulated water–slag elbow characteristics with various slag injection positions by simulating five simplified and representative erosion categories, including A-type horizontal-vertical elbow with an upstream flow, B-type horizontal-vertical elbow with a downstream flow, C-type vertical-horizontal elbow with an upstream flow, D-type vertical-horizontal elbow with a downstream flow and E-type horizontal-horizontal elbow. Compared with the C/D-type elbow, where particles were injected uniformly, the A-type elbow and E-type elbow were found to increase erosion rate, while the B-type elbow decreases erosion rate. An interesting discovery is that the elbow erosion rate is relatively low for small particles when particles are injected from the middle and bottom positions of the inlet section of the elbow. Based on the observation, a novel preceding rotating sheet structure was developed to regulate the particle injection position. It shows an excellent anti-erosion performance by reducing the maximum erosion rate of particles with diameters of 50, 100, and 200 μm by 23%, 35%, and 43%, respectively.

中文翻译：

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新型前置旋转片结构调节喷渣位置抑制水渣弯头侵蚀的数值模拟

弯头冲蚀严重危害煤气化系统水排渣管道的安全稳定运行。本文通过模拟 5 种简化且有代表性的侵蚀类别，模拟了不同喷渣位置的水渣弯头特性，包括 A 型上流水平-垂直弯头、B 型水平-垂直下游弯头、C 型上流直卧弯头、下流D型直卧弯头、E型横卧弯头。与颗粒均匀注入的C/D型弯头相比，A型弯头和E型弯头的侵蚀率增加，而B型弯头的侵蚀率降低。一个有趣的发现是，当颗粒从弯管入口段的中部和底部位置注入时，对于小颗粒，弯管侵蚀率相对较低。根据观察，开发了一种新颖的前置旋转片结构来调节粒子喷射位置。表现出优异的抗侵蚀性能，直径50、100、200μm颗粒的最大侵蚀率分别降低23%、35%、43%。