Analysis Of Variable Condition Of Absorption Heat Pump Based On The Heating Load Characteristic Of The Heating Unit

Energy conservation has been advocated by the state theme,and Combined heat and power is an effective way to save energy and reduce consumption.With the increasing demand for domestic heating,heating technology has also been diversified,but conventional extraction steam heating unit exhaust contains a lot of waste heat.Because this part of the heat temperature is low directly discharged into the environment,and can't be directly used to the actual production process,resulting in a large waste of heat.The use of absorption heat pump heating system can not only recovery the waste heat of circulating cooling water,but also reduce the steam extracted from the communicating pipe between intermediate pressure(IP)and low pressure(LP)cylinders,increase power generation and improve power plant energy utilization rate,without expanding the size of the unit and heat load.In this paper,Jiamusi is chosen as the cold area.First,the temperature of the net supply and return water in the heating period is determined by the method of centralizing the heating network.Secondly,a 2 × 350 MW condensing pumping unit is selected as an example of the absorption heat pump heating system transformation.According to the ambient temperature of Jiamusi,the heat pump water temperature is calculated and the basic parameters of absorption heat pump,heat transfer area of each device,heat transfer coefficient,heat transfer load and other parameters determine are determined.Ebsilon software is used to simulate the absorption heat pump system and heat pump coupled 2 × 350 MW unit heating system and verify the results of design condition through actual data.At the same time,the operation of the absorption heat pump heating system during the heating period is simulated to reveal the change of the performance coefficient,the outlet water temperature and the heat load of the heat pump under different return water temperature and circulating water outlet temperature.Based on the analyze of absorption heat pump coupled 2 × 350 MW unit heating system and traditional extraction heating system,this paper reveals that the absorption heat pump heating system can reduce steam extraction by 1.8%,increase the power generation by 2.9% and decrease the power generation standard coal consumption rate by 2.8% compared with the traditional extraction heating mode under the condition of same heat load.For the 2 × 350 MW units,the maximum heating potential of the two heating schemes was found,the maximum heating area of the traditional extraction heating program is 1220 million square meters,while the heat pump transformation scheme expands the heating area to 1411.83 million square meters,expanding by 15.72%.Finally,a dynamic investment payback period method is used to analyze the technical economics of the absorption heat pump heating system.The results show that the first nine years after the completion of the transformation program profit,and find that net income is the first sensitive factor to the net effect,followed by the initial investment,the most insensitive factors for the annual operating costs.The results provide a reference for the economy of the absorption heat pump retrofit.