Study On The Internal Structure Design And Dynamic Simulation Of The Desuperheater

Desuperheater is widely used in industrial boiler,thermal power plant and petrochemical industry5 Its main function is to convert high temperature steam generated in industry into saturated steam,which is particularly important for the safety and emission of steam system5 However,with the continuous increase of industrial output,the desuperheating effect of the desuperheater cannot be improved5 Therefore,this paper further improves the temperature reduction effect of the temperature reducer by conducting the following research and discussion:This article mainly focuses on the study of Venturi type desuperheaters,and designs a new type of spiral throttling structure to improve the desuperheating effect,which is installed in the inlet section of the desuperheater5 In order to verify the effect of this structure on improving the desuperheating effect,the new structure desuperheater and the original structure desuperheater were numerically simulated by using the ANSYS-Fluent software,and the flow lines,temperature,velocity,water vapor content and particle distribution nephogram of the internal flow field of the two different structures of desuperheaters were obtained by using the control variable method,The research results indicate that the internal flow field of the attemperator with a spiral structure has changed from a linear inlet to a spiral flow5 After atomization of the attemperating water at the nozzle,the water vapor content has been increased,absorbing more heat,and the temperature has decreased more significantly5 The trend of the water vapor content curve is just inversely proportional to the temperature curve,and the particle diameter and mass in the pipeline also correspondingly decrease,resulting in a more uniform overall distribution5 At the same time,the internal temperature and water vapor content of the two types of structure desuperheaters were analyzed under different working conditions5 The simulation results showed that when the inlet steam flow rate was 25 kg/s,the desuperheaters with the two structures had the best temperature reduction effect5 The temperature difference between the inlet and outlet of the original structure desuperheater was 1574 K,and the temperature difference between the inlet and outlet of the spiral structure was 359 K5In order to further verify the impact of the spiral flow field caused by the new spiral structure on the temperature reduction effect of the desuperheater,a spiral fan structure is installed in the inlet section of the original structure desuperheater,and the size and installation position of the structure are consistent with the new spiral structure5 By numerically simulating the helical flow field at different rotational speeds,the temperature,water vapor content,and particle distribution were compared and analyzed5 The simulation results show that compared with the original structure of the desuperheater,the spiral flow field at three different speeds improves the desuperheating effect of the desuperheater,and the desuperheating effect is best when the fan speed is 1000 rpm5 Therefore,it indicates that the spiral flow field can promote more uniform gas-liquid mixing in the internal flow field,improve the degree of desuperheating water atomization,and improve the desuperheating effect.