Performance Analysis Of Direct-fired Heat-increasing Absorption Heat Pump Heating System

Heat-increasing absorption heat pumps that use high-temperature hot water as the driving heat source are currently used in central heating systems in some cities.However,there are few related researches on the economy of this kind of heating system,the influencing factors of the heating system,and the optimization of the operation plan.This paper takes Jinan's central heating system as an example to study the use of urban central heating pipe network plus heat-increasing absorption heat pump system.The main research contents are as follows:Taking a thermal power station in Jinan that uses a heat-increasing absorption heat pump as the research object,firstly,the winter heating heat load change of the thermal power station is calculated and analyzed,and the heat load continuation diagram and the heat load dynamic distribution law throughout the heating season are given.According to the local outdoor weather parameters and the ratio of the actual heating load to the design load,the heating system operation is divided into intervals,and the operation period is divided into three intervals,namely,the initial stage,the middle stage and the final stage.Through tests and investigations,the operating data of the heating season of the thermal station is obtained,and the changes of the heating network parameters during the winter heating period of the thermal station and the change of the energy efficiency ratio of the heat pump unit are analyzed.The energy supply coefficient is introduced to characterize the overall energy efficiency of the system using heat-increasing absorption heat pumps in thermal power stations.In the first,middle and last three operating periods,the application of conventional plate heat exchangers and absorption heat pumps is compared with the energy supply coefficient of heat supply,which proves that the application of heat-increasing absorption heat pumps in thermal power stations can increase heat exchange efficiency.And heat supply to improve the overall energy efficiency of the heating system.Use Aspen plus simulation software to model the heating system of the absorption heat pump.Through simulation calculation,the coefficient of performance change curve of the heat-increasing absorption heat pump unit is obtained,and the influence of different influencing factors on the performance of the unit is analyzed.Provide theoretical guidance for the actual operation and deployment plan of the thermal power station.According to the three different operating periods of the beginning,middle and end,different operating modes of this type of thermal power station are given respectively,that is,according to the change of heating heat load,multiple switching controls can be realized between the plate heat exchanger and the absorption heat pump.Mode,that is,in the initial and final stages of heating,only the plate heat exchange equipment is activated,and the primary pipe network provides heat;in the middle of heating,when the actual heat load reaches the set value of the design heat load,it switches to the mixed mode,that is,the primary pipe The grid and the absorption heat pump share the heating load.In the middle of heating operation,when the outdoor temperature is the lowest and the heat load is the highest,the direct combustion drive can be started for peak regulation.The thermal power station is compared with the conventional thermal power station that all use the primary pipe network for heating.The results show that the thermal power station that uses the absorption heat pump unit and the heat exchange unit to operate together has significant economic and environmental benefits,and has promotion in economic and environmental protection significance.