Research On Heat Transfer Efficiency Of Low Temperate Waste-heat Power Generation System Based On Vector Control

Energy is an indispensable material in the industrial production and human life, itplays an essential role in social development, and is protection to promote progress ofsociety. In recent years, energy issues highlight the growing, how to effectively use andsave energy becomes a topic. Low temperature waste heat, as a new of electric energyrecovery technology, plays an important role for the renewable energy and environmentalproduction.Low temperature waste heat power generation technology based on Organic RankineCycle, it is an organic Rankine cycle power generation system through the heat exchangeorganic working medium and low-grade heat to drive turbines rotating to generateelectricity. And the heat energy is from industrial waste smoke, waste gas, waste liquid,flammable materials, and so on. In this paper, high efficiency and stability of heat transferas a precondition, studied low temperature waste heat power generation system.First, through the theoretical analysis of low temperature waste heat system, andcombining with the working medium selection standards, studies physical nature of thecommonly organic substance, and analyzes the heat transfer principle with plate evaporator,establishes mathematical model of the plate evaporator; According to the mathematicalmodel, analyzes several important factors for heat transfer performance of plate typeevaporator, and proposed tracking control methods for the plate evaporator heat transferefficiency.Second, superheat control theory and control strategy; combining vector control andspace voltage vector designed the asynchronous motor vector control system based onSVPWM, and analyzed in Simulink; using fuzzy PID compound control designed asuperheating temperature controller, and conducted a modeling analysis and experimentalverification.Finally, based on the experimental platform of industrial low temperature waste heatpower generation system, The working medium pump control system circuit including IGBT driving circuit, over current protection and under-voltage protection circuit wasdesigned; thought experiment of the platform, we can conclude three group afflictions:relationship curve between evaporator outlet pressure, working medium pump frequencyand system thermal efficiency was obtained, relationship curve between evaporator outlettemperature and thermal efficiency of the system, relationship curve working mediumpump frequency, temperature of heat source and output power, verify the feasibility of thesuperheat control system. The results would offer theoretical basis for control system oflow temperature waste heat power generation.