Simulation and Experimental Research on Working Process of Steam Twin-screw Expander
As a kind of equipment that can adapt to gas-liquid two-phase waste heat recovery,twin-screw expander has a very large application market.In order to solve the problem of lack of theoretical research and error-prone engineering design of twin screw expander under partial load,a mathematical model of working process of the twin-screw expander under variable working condition was established in this pa-per.The rotor profiles were designed,the rotor meshing clearance and other geometric variables were cal-culated,the leakage and heat transfer models were established,the suction pressure correction model of the suction process under partial load was proposed,and the correction parameters that could be used to simplify the calculation were collated.Experiments were carried out by using the practical application.Verification results show that the twin-screw expander can operate stably under the working conditions with large fluctuations,and has excellent working performance of variable load;when the load is re-duced,the pressure difference of the expander is reduced because of the suction pressure loss,the leak-age is reduced,and the efficiency is increased;under the load condition from 100%to 65%,the volu-metric efficiency increases from 78.87%to 84.76%,and the adiabatic efficiency increases from 66.81%to 74.25%;compared with the experimental data,the error of flow calculation in the suction pressure correction model proposed in this paper can be controlled within 3%;the model solves the per-formance calculation problem under partial load,so that the theoretical model can better fit the practical application under partial load condition,ensuring the accuracy of the selecting type calculation of the twin-screw expander.
twin-screw expandersteam energy savingworking process simulationexperimental verifi-cationpartial load
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