| As a thermal power mechanical apparatus, plate heat exchangers have been widely used in thefields of energy transport processes for its perfect performance. The deeper researches on plate heatexchanger are necessary for enlarging its range of application. On the base of analyzing physicalmechanism of convection heat transfer, heat transfer and flow resistance characteristics of which wereinvestigated through numerical and experimental methods in this thesis. The conclusions ofinvestigations can be as governing principles for plate heat exchanger`s optimum design and theorybasis of thermal and hydraulic calculating.According to the plate heat exchanger liquid-solid two-phase flow of the complexity of thethree-dimensional flow, changes of Research board distance and solid phase volume fraction on thewide channel plate heat exchanger influence the performance of the heat transfer for using doublefluid continuum model, and getting the wide channel of plate heat exchanger liquid-solid two-phaseflow field of the flow and heat transfer characteristics which experiments results contrast test. Basedon the results of the simulation, build the mechanical steam on compression system test platform forthe experimental research of16mm wide channel for plate heat exchanger heat transfer and flowresistance performance. Analysis of solid phase volume fraction, circulation system of heat exchangerin the influence of thermal performance, the simulation results and experimental results contrast testand verify.The increase of the concentration of sodium solution with wide channel of plate heat exchangerflow and heat transfer effect performance insufficient; Changing of Sodium pulp solid phase crystalvolume fraction on wide channel plate heat exchanger flow and total heat transfer performance effectinsufficient; Board spacing can reduce the increase of plate heat exchanger loss of pressure drop andimproving the bearing capacity of the solid particles phase, but the heat exchange performancereduced.In system of MVR, liquid-solid two phase flow7m3·h-1, solid volume fraction10%, blockingappeared at the angle holes with solid phase bonding together, as liquid-solid two phase flow from7m3·h-1to19m3·h-1, blocking didn`t appear in the angle holes with solid phase bonding together, Thepressure drop of new model wide channel plate heat exchanger was higher50%than that oftraditional tube heat exchanger which was the important part of MVR, but the pressure drop of widegap plate heat exchanger was23times lower than ordinary plate heat exchanger in the same systemcondition. The consumption of metal in wide gap plate heat exchanger was lower than consumption in tube heat exchanger when the system condition was same, and the economy efficiency of wide gapplate heat exchanger was higher30%than tube heat exchanger. |
PDF Full Text Request