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针对600MW裤衩腿循环流化床锅炉水冷壁壁面上设置与不设置多阶式防磨梁情况,采用数值模拟方法研究了防磨梁对炉内颗粒平均质量浓度和颗粒轴向速度、壁面区域颗粒浓度和轴向速度分布的影响,并综合分析了颗粒流对壁面磨损的影响.结果表明:防磨梁的存在削弱了炉膛颗粒轴向速度呈“M”型分布的趋势;水冷壁壁面设置防磨梁后,稀相区下部区域颗粒平均质量浓度略有减小,上部区域略有增大;防磨梁破坏了高质量浓度贴壁颗粒下降流,使得回流区厚度和颗粒下降速度减小,且越靠近壁面,这种影响越明显;2层防磨梁之间特别是防磨梁向炉内凸起的高度范围内,贴壁回流颗粒的质量浓度和下降速度增加速度均比无防磨梁时大;加装防磨梁后,贴壁颗粒流对壁面的磨损量总体上有所减小,但防磨梁附近壁面区域的磨损量相对较大.
Aiming at the condition of multi-stage anti-friction beam installed on the wall of water-cooled wall of 600MW short leg legged circulating fluidized bed boiler, numerical simulation method was used to study the effect of anti-wear beam on the average particle concentration and particle axial velocity in the furnace. Concentration and axial velocity distribution on the surface of the wall were analyzed.The influence of particle flow on the wall surface wear was analyzed.The results show that the presence of the anti-wear beam weakens the distribution of axial velocity of the furnace in the form of “” M After setting the anti-wear beam, the average mass concentration of the particles in the lower region of the dilute phase slightly decreases and the upper region slightly increases. The anti-friction beam destroys the descending flow of the high-quality concentration adherent particles, Small, and the closer to the wall, the more obvious this effect; between the two layers of anti-wear beams, especially the height of the anti-wear beam raised to the furnace, the concentration of adherent particles refluxed and the rate of decline in speed increase than non-wear Liang Shida; After the anti-wear beam is installed, the wear amount of the adherent particle flow to the wall surface generally decreases, but the wear amount of the wall area near the anti-wear beam is relatively large.