Numerical Simulation Radial Force In The Chilling Water Circulating Pump With Guide Vane

Chilling water circulation pump is main equipment used in Texaco pressure water coal slurry gasification technology to increase humidity and decrease temperature and maintain the internal liquid level. Its reliable operation directly affects the stability and safety of process system. The causes of instability varies, and one of them is radial force due to unevenness of circumferential pressure distribution of the impeller. Therefore, aim at the problem that the chilling water circulation pump with guide vane balanced radial force, the research of radial force in the chilling water circulation pump and optimization of guide vane parameter is very important in decrease the risk of failure of the pump. This article adopts the method between the numerical simulation and experimental validation to explore the influence of the radial force with different blades, import width and radial clearance of the guide vane in the chilling water circulation pump. In this paper, the main research contents and conclusions are as follows:(1) Analyze the changing law of radial force on impeller through steady and unsteady simulation of fluid area of chamber with and without guide vane. The results are:The flow rate influences the chamber without guide vane most, and the joint force and fluctuation range of radial force is big when the flow rate varies from design point. The radial force change of chamber with guide vane in whole flow rates is smooth, whose fluctuation is low. The results show a better effect of the balance of radial force in chamber with guide vane.(2) Carry out steady and unsteady simulation of chamber with guide vane with blade 5,6,7,8,9 to analyze the changing law of radial force when flow rate and time changes. The results are:the radial force decreases first, then increases when the number of blade increases over the whole flow range, and the radial force of 8 blades remains a low level. In design flow rate point, radial force of chamber of 8 blades is 50% less than that of 5 blades, and 30% less than 9 blades. The joint force of radial force and fluctuation of chamber with 5 blades vane is biggest and that of 8 blades is smallest. The result shows that there exists a best number of vane blades which can improve the impeller radial force.(3) Change the vane import width and radial clearance to carry out unsteady simulation to analyze the influence of these parameter to radial force when time changes, while the number of vane blades remains 8. The results are:decreasing the import width improves the radial force of impeller under low flow rate condition, but the radial force vector changes a lot when time changes. When the flow rate increases, the import width is bigger, the joint force and fluctuation of radial force is smaller. Increase the import width properly may improve the radial force under big flow rate condition. When radial clearance increases under low flow rate, the radial force increases first, then decreases, and the distribution range of radial force vector is wide. The radial force increases when radial clearance increases under design condition and high flow rate condition. It shows that the ability of chamber with guide vane to balance the radial force becomes worse when increasing the radial clearance.