水煤浆参数对输送弯管冲蚀磨损影响分析

The effect of Coal-water Slurry Parameters on the Erosion of Transport Bends

针对水煤浆气化炉进料弯管面临的固液两相流冲蚀磨损导致的穿孔失效问题,以进料输送弯管为研究对象,水煤浆主要参数(流速v、煤粉直径d_(p)、煤粉质量流量q_(m))为变量,采用CFD-DPM耦合方法开展主要参数对冲蚀磨损速率影响的单变量数值模拟,使用响应曲面法进行多因素交互作用下对弯管冲蚀磨损速率影响显著程度分析并对水煤浆主要参数做出优化。研究表明,弯管的冲蚀磨损现象集中在弯管轴向80°~90°,且一般不随影响因素改变而移动。从单变量模拟结果来看,煤粉直径对冲蚀磨损速率的影响远远小于其他因素的影响;经响应曲面法分析,介质流速对冲蚀磨损速率影响最为显著;在介质流速v为20 m/s,煤粉质量流量q_(m)为0.5 kg/s,煤粉直径dp为0.8 mm条件下,输送弯管冲蚀磨损速率最小。

Aiming at the perforation failure caused by erosion wear caused by solid-liquid two-phase flow in the feed pipe of coal water slurry vaporization furnace,taking the feed conveying pipe as the research object and taking the main parameters of coal water slurry(flow rate v,pulverized coal diameter dp,pulverized coal mass flow rate qm)as variables,the univariate numerical simulation of the influence of main parameters on erosion and wear rate was carried out by CFD-DPM coupling method.The response surface method was used to analyze the significant degree of influence on the erosion wear rate of bending pipe under the interaction of multiple factors,and the main parameters of coal water slurry were optimized.The research shows that the erosion wear phenomenon of bending pipe is concentrated in the bending axis of 80°-90°,and generally does not move with the change of influencing factors.From the univariate simulation results,the effect of pulverized coal diameter on the erosion rate is much smaller than that of other factors.According to the response surface method,the effect of medium velocity on the erosion rate is the most significant.When the medium flow rate v is 20 m/s,the pulverized coal mass flow rate qm is 0.5 kg/s,and the pulverized coal diameter dp is 0.8 mm,the erosion wear rate of the conveying bend pipe is the smallest.