Study On Waste Heat Recovery System With Absorption Heat Pump In An Industrial Park

The current industrial energy consumption contains a large amount of industrial waste heat.If it is not used,the waste heat will be directly discharged into the atmosphere,which will not only cause a large amount of waste heat resources to be wasted,but also cause thermal pollution to the local environment.If high-efficiency waste heat recovery technology can be used to recycle and reuse this part of industrial waste heat,it can be converted into usable grade heat energy to realize industrial waste heat reuse,which will produce significant energy saving effect and good economic benefits,and meet the requirements of national energy conservation and emission reduction.The absorption heat pump plays an irreplaceable role in recycling industrial waste heat,improving energy utilization and reducing pollutant emissions.In the heating period,the absorption heat pump can improve the waste heat grade and play a role in district heating.In view of this research background,this paper studies the absorption heat pump waste heat recovery heating system.Firstly,according to the thermodynamic principle,the thermal analysis of the five main heat exchange components of the heat-increasing absorption heat pump was carried out,and the mathematical model of the absorption heat pump unit was established.At the same time,an absorption heat pump model was built by Ebsilon software,and the model was compared with the theoretical model to verify the accuracy of the model.The influence of the variation of four external parameters on the heating performance of the absorption heat pump is analyzed.The theoretical results are consistent with the simulation results.The results show that: The COP value of the heat pump increases with the temperature of the driving heat source and the inlet temperature of the low temperature heat source;it decreases with the increase of the supply water temperature and return water temperature of the heating network.Secondly,the exergy analysis of the absorption heat pump waste heat recovery system is carried out,and the exergy model is established.The exergy efficiency of the absorption heat pump system is 56.8%,which is 19.5% higher than that of the traditional heating system.The thermodynamic process of the heat pump system was simulated by Ebsilon software,and the influence of different external parameters on the exergy efficiency of the heat pump was analyzed.The result shows: The exergy efficiency of the heat pump decreases with the increase of the steam inlet temperature,and it increases with the increase of the inlet and outlet temperatures of the heat network and the inlet temperature of the circulating cooling water.Then,taking an industrial park in Baoding as an example,the available waste heat sources in the park were analyzed.Aiming at different types of waste heat in the park,an absorption heat pump waste heat recovery heating system was established.The analysis showed that the heat supply in the heating season system was86146.8MWh.Finally,the investment benefits and environmental benefits obtained from the operation of the heat pump waste heat recovery heating system during the whole heating period are analyzed.The economy of the heat pump waste heat recovery system was analyzed by the dynamic investment payback period method.The system compares the economics and environmental protection property with the distributed energy system of the park.The result shows:(1)in the heating period,the use of absorption heat pump to recover the waste heat of the park can save 13659.3t of standard coal per year.According to the 650 RMB per ton,the annual savings can be about 8,891,700 RMB.The pollutant emission can be reduced to 102.44 t carbon dust,35787.37 t carbon dioxide,218.55 t sulfur dioxide,103.81 t nitrogen oxide.(2)the dynamic investment recovery period of the renovation project using the absorption heat pump to recover the waste heat is less than the rated service life of the equipment,indicating that the transformation project is feasible.(3)by comparing the waste heat recovery heating system with the distributed energy system,it is found that the initial investment and freight cost of the distributed energy system is far greater than the waste heat recovery heating system,and at the same time,in terms of environmental protection,The total emissions of distributed energy systems have far more than waste heat recovery heating system.