130t/h Coal-fired Boiler Renovation Project Study On The Recovery Scheme Of Smoke Waete Heat

The world's energy problems are becoming increasingly prominent,and research on energy conservation has attracted more and more attention and attention from more and more countries.In China,the energy consumption of industrial boilers is huge and inefficient.Therefore,improving the thermal efficiency of industrial boilers plays an important role in solving the energy problems in China.Based on the study of the residual heat recovery system designed by a practical engineering case(a 130t/h coal-fired boiler),this paper gives a method for calculating the amount of smoke and the amount of residual heat recovery,and calculates the amount of smoke recovered and the amount of residual heat recovery.To interpret the energy conservation measures and methods of industrial boilers.In view of the problems that may arise during the operation of this waste heat recovery system,such as the low temperature corrosion problem,the ash problem of heat transfer area,and the problem of condensed acid slurry,this paper analyzes the causes of the problems and seeks solutions from the perspective of practical engineering.Finally came to a reasonable conclusion.There are two very important devices in the whole waste heat recovery system,namely,direct contact heat exchanger and heat pump system.First,the direct contact heat exchanger is introduced.It is through this device that the flue gas and water are reversed to heat transfer the residual heat of the flue gas to the circulating water so that it can be used to heat the heat network back water.In this paper,the heat transfer theory of flue gas and water in direct contact heat exchanger is introduced.Based on this theory,the thermal calculation of the whole device is carried out,and the dimensions of heat exchanger and water temperature are obtained.In order to ensure the normal operation of the direct contact heat exchanger,it is necessary to design the structure,the point of addition and the type of nozzle reasonably.In this paper,the design of the device is explored and improved to meet its function.In order to maximize the utilization of the residual heat from the exhaust heat recovery device,this paper introduces the two forms of heat pump system(steam compression heat pump and absorption heat pump)and analyzes the scheme to obtain the applicable heat pump form of the system.Afterwards,the heat pump system itself was studied,the mathematical model was established,the evaluation index was introduced,and the thermal calculation was performed in combination with the literature.The thermal calculation results were given.Finally,this paper analyzes the cost and operating cost of two different forms of heat pump,introduces the theory of HVAC engineering,that is,the annual cost,life cycle cost and dynamic investment recovery period,and calculates and analyzes the entire heat recovery system.Finally,the evaluation histogram of two schemes is given.