背压对U阀排料特性的影响  

Influence of Back Pressure on Discharge Property of U-valve

作　　者：焦方冉 李洪钟[1] 朱庆山[1] 

机构地区：[1]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [2]中国科学院大学化学与化工学院,北京100049

出　　处：《过程工程学报》2016年第4期571-576,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51404228)

摘　　要：实验研究了背压对U阀排料特性的影响,建立了可调节背压的立管-U阀实验平台,发现随背压增大,U阀排料速率明显减小,进气速率对排料速率的调控能力变弱,且背压波动时,孔口的高度越小,U阀的运行越稳定.针对本实验装置,背压小于7 k Pa时,U阀孔口高度小于0.11 m,背压大于13 k Pa时,孔口高度大于0.15 m,使U阀获得良好的排料特性.根据实验数据和理论分析建立了U阀排料速率与背压、进气速率和孔口高度之间的经验方程,计算值与实验值的平均相对误差为20.9%.In order to investigate the influence of the back pressure on the solid discharge rate of the U-valve, a setup with adjustable back pressure was established. Experimental results revealed that the solid discharge rate, as well as the effective aeration rate on the solid discharge rate decreased with increasing the back pressure. Both the back pressure and the orifice height had significant influence on the discharge behavior of the U-valve. When the back pressure fluctuation was significant, the operation of the U-valve was more stable with a smaller orifice height. The orifice height had a suitable range to obtain a stable discharge rate, i.e., the orifice height was less than 0.11 m, the back pressure was less than 7 k Pa, the back pressure was greater than 13 k Pa, and the orifice height was more than 0.15 m. In addition, the solid discharge rate was correlated with the back pressure, the aeration rate, and the orifice height. The average relative error was 20.9% between the calculated and the experimental data. Based on this correlation, the reasonable range of orifice height was calculated to provide the guidance for the design of U-valves.

关 键 词：U阀 背压 排料特性 孔口高度 

分 类 号：TQ051.2[化学工程]