Absorption Heat Pump Application In The Feasibility Study Of A Thermal Power Plant Of Zhengzhou

With the development of modern science and technology, energy conservation and recycling are of great importance. Over 50% of heat is not used effectively during the normal operation of the thermal power plant, most of which is taken away by the circulating water and released into the atmosphere. However, the absorption heat pump is a kind of technology which can recycle the heat. Using this technology to renovate power plant,which can allow the low-temperature heat to be recycled in the circulating water,thus improving energy efficiency and obtaining both economic and environmental benefit.With cogeneration units in a thermal power plant in the Eastern District of Zhengzhou City as the object of study, the original heating system in the power plant is designed and modified in this paper by analyzing the principle of the absorption heat pump. On the basis of the original heating system, the absorption heat pump is added to directly heat the backwater in the municipal heating system, and the water is discharged from the heat pump unit and entered into the heater of the original heating system for reheating so that the parameter requirements for water supply of the municipal heating system can be met.Firstly, the physical model for modifying the original heating system with the absorption heat pump technology is established. By knowing the general background information about the project, the feasibility of modifying the absorption heat pump is analyzed from realistic conditions, natural conditions, heat economy and technologysecurity to build the flow chart of the modified heating system, establish the physical model and describe the operating mode for each season.Secondly, the heat calculation is conducted on the heating system before and after the modification respectively. The heat flow diagram is designed for the model of the modified heating system. The steam consumption for heating after the modification is obtained through the heat calculation by assuming operating parameters. Then, the conclusion on the steam saved due to the modification of the heating system in the absorption heat pump unit is drawn by comparing it with the steam extraction capacity for heating calculated before the modification. The steam can be converted to the coal saved or power generation increased, i.e. the economic and environmental benefit created.Finally, optimization analysis is made to the data after the modification. On one hand, the effect of changes in the driving steam pressure, circulating water temperature and temperature of heating system water flowing in and out of the heat pump unit on the performance index of the heat pump is analyzed. On the other hand, on the supposition that the heating load and partial heating parameters remain unchanged, operating parameters of the heat pump unit and different COP are selected randomly to calculate the heating steam with the trial method. Near-optimal operating parameters of the heat pump unit are obtained by comparing these data.