Analysis And Optimization Of Tube Heat Exchanger For Heat Recovery Purpose

This paper describes the emissions of factory boilers’ waste smoke and therecovery of the waste smoke’s energy.Many factories boiler’s waste smoke carries heat and the temperature in the two orthree hundred degrees Celsius, these flue gas directly emitted into the air will definitelylead to a waste of resources, then we solve this problem and tube heat exchanger toabsorb waste heat from the smoke, the energy used for other purposes, which cangreatly save energy. Heat exchanger uses spiral finned tube; manufacturers give thebasis size of the heat exchanger by the drawing of it and then to determine the size ofthe heat exchanger optimization according to the basis size and calculating results. Thepresent heat exchanger length, width and high are known, the diameter of the pipe andthe flow rate of the flue gas is also known, identified by calculating the speed of thewater under these conditions known data, the number of roots of the tube, and fin size,the distance between the tube and how to place the best solution to achieve the besteffect of heat transfer and flue gas dropped from between165℃and180℃to120℃, the temperature of the water in the spiral finned tubes increased from20℃to90℃, the hot water is used for other purposes, such as heating.To achieve the optimization of the heat exchanger, people mainly use Fluentsoftware to calculate with the Gambit software creating a physical model and then usingFluent calculated, and finally using Tecplot to observate and treat the results. However,due to the large number of tube heat exchanger structure, coupled with fins, eventuallyleading to the computer cannot be calculated, the simulation is only on the heatexchanger local three-dimensional simulation, the method of calculation of the localthree-dimensional simulation results and engineering binding, and ultimately release thegeneral scheme of the heat exchanger.On local simulation of spiral finned tube heat exchanger, the tilt angle of the tubesof the heat exchanger affect the effect of heat transfer and when the angel of the tubesare about58degrees, the effect of heat transfer is the best. Fins on the heat transfereffect also impact, ultimately obtained by adjusting the size of the fin thickness andpitch, the net fin distance to achieve the best effect of the heat exchanger within acertain range then. The height of the fins should be controlled within a certain range; theexcessive increase of the fin height of the heat exchanger will not achieve a great role,and there will be a waste of resources. By adjusting the distance between the tubes,eventually drawn, the greater the tube spacing, the better the effect of heat transfer.Andin constant space, the tube spacing is as far as possible, this could make the fully heatexchanger of the fluid and the heat transfer tube.