| As an industrial water-cooling technology,wet cooling towers are widely used in electric power,petrochemical and other industries.Reducing the evaporation loss in wet cooling towers is an urgent problem to be solved.The use of thermosiphon technology to reduce the evaporation loss of wet cooling towers has good engineering application prospects.However,there are few research literatures on this technology,and the research does not consider the effects of thermosiphon on the heat transfer performance of the cooling tower.Therefore,in order to promote the use of simple solutions to ensure better cooling efficiency while ensuring the heat transfer effect of the cooling tower,this paper takes the mechanical ventilation counterflow wet cooling tower of a gas-fired thermal power plant in Beijing as an example,and adds a thermosiphon to carry out water-saving reform.The research on heat transfer and water saving performance of the addition of thermosiphon countercurrent wet cooling tower is carried out in order to provide some reference and guidance for the research of water saving of wet type tower.Firstly,this paper uses ANSYS software to establish a three-dimensional model of the mechanical ventilation counterflow wet cooling tower of a gas-fired thermal power plant in Beijing.The simulation results are compared with the measured data to verify the correctness of the established numerical model and the air in the cooling tower is wet.The quantity analysis is carried out,and the verified model and the parameter analysis of the air moisture content in the tower provide a reliable basis for subsequent research and comparative analysis.Secondly,based on the tower,a thermosiphon was added to carry out water-saving reform.The ANSYS software was used to simulate the counter-flow wet cooling tower with thermosiphon.The thermosiphon pair was analyzed by comparison with the wet cooling tower without thermosiphon.The influence of heat transfer and water-saving performance in the tower.It is found that under the typical working conditions in summer,the maximum temperature rise of the tower cooling water tower is 0.51 K after the addition of the thermosiphon.Under the typical conditions of winter,the addition of the thermosiphon is followed by the wet cooling tower.The maximum temperature rise of the tower water temperature is 0.36 K.It can be seen that the thermosiphon has little effect on the heat transfer performance of the cooling tower.Under the typical working conditions in summer,the evaporation loss of the cooling tower after the addition of the thermosiphon is reduced by about 23.30t/h,accounting for 46.23 of the original evaporation loss.%,under typical working conditions in winter,the evaporation loss after adding thermosiphon decreased by 24.56t/h,accounting for 57.29% of the original evaporation loss.It can be seen that the addition of thermosiphon countercurrent wet cooling tower has good water-saving performance.Finally,based on the analysis of heat transfer and water-saving performance of the addition of thermosiphon counterflow wet cooling tower,the study of environmental dry bulb temperature,ambient wind speed,thermosiphon tube spacing and thermosiphon inclination on cooling tower performance.The impact provides theoretical guidance and methods for optimizing the structural design and operation of the system,and provides a reference for its optimal operation mode.The research shows that the heat transfer performance and water-saving performance decrease with the increase of ambient dry bulb temperature;the heat transfer performance decreases with the increase of ambient wind speed,and the water-saving performance increases first and then decreases with the increase of wind speed.When the ambient wind speed is 1-4m/s,the heat transfer performance and water-saving performance are better;the heat transfer performance increases with the increase of the pipe spacing,and decreases with the increase of the pipe inclination;The increase of the pipe spacing first increases and then decreases due to the decrease of the heat exchange area,and increases first and then decreases as the pipe inclination increases. |
