Erosion Wear Analysis On Valve Cage of Cage-Typed Sleeve Control Valve for Coal Liquefaction

Abstract

Cage-typed sleeve control valve (CSCV) is the key basic equipment in direct coal liquefaction project. The working condition of CSCV has the characteristics of high pressure difference, high velocity and high solid content. There is a general problem of liquid-solid two-phase erosion wear in CSCV, which is easy to lead to the failure of internal structure in the valve cage. Therefore, it is necessary to study erosion wear characteristics of internal structure in the valve cage. Based on the actual situation of erosion wear in the valve cage, the simplified T-shaped flow path is designed, and the accuracy of the liquid-solid two-phase flow model and the erosion prediction model are verified; The flow characteristics and erosion wear characteristics of T-shaped flow path under different working conditions are studied; Based on the simulation results of different structural parameters and boundary conditions, the erosion wear of T-shaped flow path is predicted and calculated by response surface method, and the prediction formula of maximum erosion rate is obtained. The formula allows for the rapid determination of optimized flow path structural parameters to reduce damage to the valve from erosion and wear. This work can quickly predict the erosion wear rate of the key areas in the valve cage, which can provide a certain reference value for the life prediction and structural optimization of CSCV, and it can also benefit safety and maintenance of coal liquefaction system.