Modeling And Control Method On Evaporator-Pump-Motor Of The Industrial Waste Heat Power Generation System

With the rapid development of our economy, energy relatively shortage has become an important factors which restricts the economic and social development. In order to sustainable development for the social environment, the waste heat recovery and recycling become a hot research problem in the developing countries and developed countries. Use of low temperature waste heat power generation is one of the effective methods which solve this problem. In order to improve the thermal conversion efficiency of the plate evaporator in the waste heat power generation systems, the paper researches the low temperature waste heat power generation systems.With the full investigation on the related field of the international and domestic, this paper bases on the low temperature waste heat power generation system which mainly aimed at the 100~200℃low-temperature waste heat. Combining with the actual engineering situation, this paper chooses the organic medium R600a as the circulation medium of waste heat power generation system. And the experiment system model includes the board type evaporator, working medium pump, condenser and the turbine generator sets components.Based on the foundation of thermodynamics and Organic Lang Ken cycle theory, the paper considering the changing of outside heat source affect the thermal efficiency of the system, and will therefore defined as a system of interference. The paper combines with low temperature waste heat power generation technology to establish the control strategy of the superheat of low temperature waste heat power generation system, and according to the control strategy to establish the control principle block diagram of system. At the same time this paper based on organic R600a to theoretically analyze the board type evaporator, then gets the association plans and distribution parameter of the steady-state mathematical model of the board type evaporator. And then the steady-state model on the numerical simulation calculation and simulation, this paper gets the simulation result of plate evaporator export temperature and heat transfer; through the simulation results verify the established mathematical model is correct. Then based on the MATLAB/Simulink software, this paper builds the heat control simulation model and the simulation results show the feasibility of the control strategy of superheat. At the same time, the paper builds the induction motor vector control system which bases on the SVPWM, through the simulation verify the superiority of the SVPWM and the vector control system. With reference to the standards at home and abroad and connecting with the practice, the paper builds the low temperature waste heat power generation experimental system and designs the overall scheme of the experiment and the processing method of the experimental data, and simultaneously the heat experiment and the overheat control experiment of the plate evaporator. According to the comparison of the experimental results and the simulation results, through the experimental results and contrast further demonstrate the control strategy, and according to the experimental results obtained with the first-order transfer function between the flow and the overheat; At the same time the paper use the experimental results to optimize the control strategy.