Application Of Absorption Heat Pump In Cogeneration System

Currently,CHP has become a main heating method of urban central heating,it can make rational use of heat generated in the process of power generation,and it also can meet winter heating demands with the city power supply.Firstly,this paper describes the traditional direct exhaust heat programme,using compression heat pump programme and the use of absorption heat pump programme in cogeneration.And compared these kinds of heating schemes respectively,the advantages of using the absorption heat pump in cogeneration system were obtained.At the same time,this paper wants to use Trnsys as a platform to build a simulation model of absorption heat pump heating system.Because of the lack of lithium bromide absorption heat pump module in the basic module of Trnsys16,the author establishes the corresponding mathematical model of thermophysical subroutine and the related parts of heat pump.Based on the absorption heat pump design flow,the absorption heat pump design calculation program is programmed in Matlab.At last,the simulation model of absorption heat pump heating system was established in Trnsys software by calling the program of absorption heat pump.Taking the primary energy efficiency as the optimization goal,the system is simulated and the optimum parameters of the system are obtained.The results show that the driving steam pressure can be increased,the water supply and return water temperature of the heat supply network can be reduced,and the circulating cooling water temperature of the evaporator outlet can be raised to enhance the heat pump system.Meanwhile,the parameter adjustment of the unit should be appropriate,otherwise it would easily lead to a large deflation range and affect the normal operation of the unit.And the range of parameters for this simulation parameters,the use of absorption heat pump heating system to achieve the maximum energy efficiency when the combination of parameters are as follows:the temperature of water supply network is 60?,the temperature of condenser is 25?,the flow rate of steam turbine is 150,000Kg/H,and the turbine exhaust pressure is 680 Kpa.At this point,the system's primary energy efficiency is up to 64.66%,thermal ratio is up to 228.70% and the power plant revenue is up to 26,500 yuan/h.