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Dynamic Analysis of Flow Field Inside Centrifugal Semi-lean Pumps

Author: LiYue
Tutor: MaRuJian
School: Jinan University
Course: Mechanical and Electronic Engineering
Keywords: centrifugal pump semi-lean solution fluid dynamics numerical simulation CFD
CLC: TH311
Type: Master's thesis
Year: 2013
Downloads: 2
Quote: 0
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Abstract


The decarburization technology plays an important role in natural gas treatment process.The decarburization system of the2nd stage of East Terminal in Zhanjiang Division ofCNOOC adopts activated MDEA technology for removing CO2, and this process is dividedinto two-stage absorption and two-stage regeneration. MDEA solution absorbs CO2becomesMDEA-rich solution and after partial parsing becomes semi-lean solution. Furthermore,semi-lean solution is pressurized up to the middle of absorption tower by the semi-lean pumphere.In order to make the continuous production, the pump plays a very important role.However, the Phase ii decarburization system has a problem is the pump often damaged. Thisis harmful to the pump and the production. In view of the above problems, this subject tocentrifugal semi-lean pump as the research object, considering the operation status ofsemi-lean solution properties and centrifugal pump, basing on computational fluid dynamicsCFD technology, starting from the mechanism of the internal fluid flow of a centrifugal pump,using numerical simulation analysis of flow pattern of MDEA semi-lean solutioncharacteristics and the pump flow the pump flow field, and to predict the pump performancecurves.First of all, The East terminal Phase ii decarburization system using decarburizationprocess, technology of activation MDEA and its principle is described in detail. Andaccording to the two-stage absorption and two-stage regeneration decarburization process,points out that the semi-lean solution is not saturated solution. I got composition of semi-leansolution and characteristics of CO2volume fraction features according to the flash pressureand flash temperature.Secondly, the flow of semi-lean centrifugal pump is three-dimensional, not compressible,viscous and with complex rules. These are closely related to impeller and volute shapecomplex structure, semi-lean solution-characteristics and coupling effects between rotatingimpeller and stationary volute. The topic selected centrifugal pump from the inlet to the outlet of the volute flow channel as the flow calculation region, including the import section, therotation of the impeller and volute collection area. The fluid model was established usingSolidworks software, and meshed model by Gambit software. I selected standard k-εtwo-equation turbulence model as a closed model numerical modeling of flow in centrifugalpump. I selected velocity inlet, outflow boundary condition according to the operationconditions of the centrifugal pump and semi-lean solution not compressible flow. Betweencentrifugal pump rotation area (within the impeller fluid) and stationary area (inside volutefluid) coupled model used the Multiple Reference Frame. The calculation model was selectedsegregated Solver, momentum equation and continuity equation was solved by the SIMPLEalgorithm, and last got the distribution of flow field in centrifugal pump.Finally, according to the CFD numerical simulation results of the centrifugal pump haveanalyzed the distribution of pressure field and velocity field, and have proved that the resultsof simulation consisted with the working principle of the impeller and volute.The centrifugalpump impeller’s role is to convert mechanical energy into kinetic energy of the fluid, and thefunction of the volute is to collect the high speed fluid from the impeller and to convertkinetic energy into pressure energy. And according to characteristics of semi-lean solutionhave written UDF program and have analyzed characteristics of semi-lean solution insidepump. In order to better understand the performance of the pump, according to the results ofthe simulation have predicted pump performance curves.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Pump > Vane pump > Centrifugal pump
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