含固体颗粒流体用安全阀的自动冲洗装置及冲洗过程数值模拟  

Automatically Flushing Device of Relief Valve for Fluid with Solid Particles and Numerical Simulation of Flushing Process

作　　者：齐亚茹[1] 董俊华[1] 高炳军[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《机械工程学报》2011年第24期158-164,共7页Journal of Mechanical Engineering

摘　　要：针对煤液化工业油煤浆输送管路中安全阀不能可靠关闭问题,提出一种安全阀自动冲洗装置。在安全阀与输送主管路连接管路上增设气液直接接触式蓄势器冲洗装置,蓄势器内充入一定量冲洗油,并通过冲洗油支路与安全阀入口管路相连。冲洗油管路上设置自控阀门,以安全阀阀瓣动作为控制信号。当阀瓣有回座动作时,自控阀门自动打开,冲洗油对安全阀进行自动冲洗。为分析方案的可行性,以油煤浆为输送流体、溶剂油为冲洗介质,运用FLUENT软件的双欧拉模型对安全阀内煤颗粒的冲洗过程进行三维数值模拟。计算结果表明,冲洗装置可有效地清除安全阀内的固相颗粒,保证安全阀可靠关闭。分析表明,冲洗过程瞬间完成,相对于主流体而言,仅有少量与主流体相容的冲洗油进入流体输送管路,不会影响液化工艺过程的稳定性。A type of automatically flushing device is suggested to avoid the unreliable closing of the relief valve used in fluid with solid particles,which encounters in coal liquefaction industry.A flushing device of gas-liquid directly contacting accumulator is set up in the pipeline between relief valve and the slurry feeding pipeline.The accumulator is filled with certain amount flushing oil and is connected with inlet pipe of relief valve through flushing oil branch pipe.A control valve is installed in the flushing oil branch pipe and is controlled by signals of the valve clack movement.The valve should be opened automatically when the valve clack is detected to move back to the valve seat.To verify the feasibility of the suggested device,flushing process of coal particles in relief valve is numerically simulated with Eulerian-Eulerian model in FLUENT,in which coal-oil mixture（COM） is the transporting fluid and solvent oil is the flushing oil.The results show that the flushing device can flush away the particles effectively,which promise reliable close of relief valve.Further analysis shows that flushing process is completed instantly,and only a little amount of the flushing oil enters the mainstream.Moreover,the flushing oil is compatible with the COM,so it will not impact the stability of liquefaction process.

关 键 词：安全阀 油煤浆 防泄漏 自动冲洗 数值模拟 

分 类 号：TQ86[化学工程]