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CFD Simulation and of the Lithium Electrolyzer

Author: LiSuZhen
Tutor: YuJianGuo
School: East China University of Science and Technology
Course: Chemical Engineering
Keywords: Lithium electrolyzer Computational fluid dynamics Impeller PIV Fluent
CLC: TQ150.5
Type: Master's thesis
Year: 2012
Downloads: 42
Quote: 0
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Abstract


Lithium electrolyzer is the most important equipment in the lithium production process. The flow field in the electrolyzer has great effect on the current efficiency. In this paper, flow field in the lithium elctroylyzer is studied to reduce the energy consumption. The electrolyzer is separated into two parts, electrolytic room and lithium collect room. An impeller was set in the lithium collect room to collect lithium. Lithium and the molten salt went into the collect room through a siphon pipe, and were separated because of buoyancy. Through optimizing the stir tank in the lithium collect room, the lithium can flow faster from the electrolytic room to lithium collect room, reduce the contact time between lithium and chlorine, and improve current efficiency.Multiple reference frame (MRF) method of CFD was used with k-εtwo equations models and Reynolds stress equation model. Calculated results with Reynolds stress equation model and k-εtwo-equation model agree well with PIV experiments. This is because we did average steady-state process in the PIV results, which is similar with the k-εtwo-equation model and Reynolds stress equation model. Results indicate that the simplest standard k-εmodel has practical guidance to meet our industrial needs.Multiple reference frame method (MRF) and standard k-εmodel was used to simulate flow field of the aqueous solution in the lithium collect room. The velocity in the pipe below the stir tank on the conditions of different impeller, impeller mounting height, speed, and height of the stir tank were compared. Simulation results show that three blade axial impeller is best. The lower stir tank wall will lead the higher velocity in the pipe. The impeller mounting height is the same. The impeller rotation speed should be as high as possible.The flow field in the lithium collect room cold model was mearsured with Partical Image Velocimetry (PIV). The experimental results agree well with caculated results.In order to understand the flow field of 2000A industrial lithium electrolyzer,1:1 cold model was built based on the optimized structure of the mixing tank. And the cold model was studied by numerical calculation and experiments to get the highest current efficiency.

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