高炉渣颗粒绕流异形管磨损过程的数值模拟  

A numerical study on wear process of particle flow around shaped tubes

作　　者：郭燕 于庆波 秦勤 Guo Yan;Yu Qingbo;Qin Qin(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,沈阳110819

出　　处：《材料与冶金学报》2020年第3期156-161,共6页Journal of Materials and Metallurgy

基　　金：国家重点研发计划(2017YFB0603603);辽宁省‘兴辽英才计划’项目资助(XLYC1802003).

摘　　要：采用离散单元法模拟了颗粒绕流圆形、椭圆形、六边形、菱形和三角形五种换热管的磨损情况,追踪了颗粒在换热管近壁区的运动,计算了换热管的累积能量与磨损量.结果表明:颗粒绕流时在换热管底部均会形成空隙区,其中颗粒与圆形管接触最充分,空隙区面积占总面积的比例最小,为5.8%,三角形管空隙区面积占总面积的比例最大,为57.7%;每种管形的切向累积能量均大于法向累积能量,切向累积能量从小到大依次为:圆管,椭圆管,六边形管,菱形管,三角形管,且三角形管的切向累积能量为圆管的13倍;20 s内圆形管累积磨损量最大,椭圆形管、菱形管、六边形管的累积磨损量依次增大,三角形管累积磨损量最小,每种管形的最大磨损区域位于管侧壁面中心轴附近.The discrete element method was used to simulate the wear of five shaped heat exchange tubes with circular,elliptical,hexagonal,rhomboid and triangular cross-sections,respectively.The movement of the particles in the near wall region of each heat exchange tube was traced.The cumulative energy and wear amount of each heat exchange tube were calculated.The results showed that voids can be formed in the bottom of the tube surrounded by flowing particles.Among different tubes,the circle tube has the best contact between particles since the void volume is the smallest(i.e.,only 5.8%).In contrast,the void volume corresponding to the triangular tube is the largest,i.e.,57.7%.The tangential cumulative energy of each tube is greater than the normal cumulative energy.Regarding the tangential cumulative energy,the value increases as the shape of tube changes as follows:circular,elliptical,hexagonal,rhomboid and triangular.In addition,the tangential cumulative energy of the triangular tube is 13 times that of the circular tube.In 20 s,wear amount of the tube surface decreases as the shape of the tube changes as follows:circular,elliptical,rhomboid and triangular.The most severely worn area of each tube is located near the central axis of the sidewall surface of the tube.

关 键 词：离散单元法 颗粒流 换热管 磨损 

分 类 号：TF09[冶金工程—冶金物理化学]