Research On The Flow And Heat Transfer Characteristics Of An Indirect Air Cooling System With Three Towers

As a new application technology,the three incorporate towers is based on the Heller indirect air-cooled technology.The desulfurization tower and the chimney are arranged inside the indirect air-cooled tower to simplify the flue gas system,reduce the equipment such as GGH and heat exchanger,save water and land,reduce investment advantage.In the form of energy conservation and emissions reduction,the three incorporate towers in the thermal power industry will have a broad application prospects.In this paper,as the research object,its internal flow heat transfer characteristics and tower optimization design are studied,and the main research contents are as follows:Taking a 600 MW indirect air-cooled tower unit of a thermal power plant as the research object,the arrangement and structure dimensions of air-cooled tower,desulfurization tower and chimney are determined in.Fluent is used to establish a three incorporate numerical model.The numerical simulation of the air-cooled tower is carried out.The temperature deviation of the tower water is controlled within 5%.The correctness of the numerical model is verified and the optimum meshing mode is obtained.The distribution and heat transfer characteristics of the internal flow field of an indirect air-cooled tower with three towers are studied.According to the different ambient wind speed conditions,the influence of the vortexes on the flow field and the heat load of the radiator are analyzed.The numerical result shows that the flow field in the air-cooled tower is symmetrical in the center under the no-wind condition,with the maximum ventilation rate and the best heat exchange effect.Under windy conditions,the flow field of the air-cooled tower exhibits significant spatial characteristics.As the wind speed increasing,Air-conditioning tower to reduce ventilation,heat deterioration,under the conditions of ambient wind speed 12m/s ventilation reached the minimum value,and then begin to increase,the ventilation has risen;symmetrical vortex distribution in the desulfurization tower on both sides of the tower with the With the increase of ambient wind speed,the eddy position also gradually moves to the lee side.Compared with the eddy area,the eddy area under the middle speed wind is larger and the vortex drives a part of the mixed fume,so that the leeward side Acid gas concentration around the tower wall increases,resulting in air-cooled tower leeward side wall corrosion more serious.Three kinds of optimization schemes are proposed to optimize the tower structure by adding baffles inside the air-cooled tower.The three schemes are compared according to the change of the ventilation volume,and the optimal structure of scheme 3 is obtained,and the air in the air-cooled tower The reorganization and optimization of the flow field will increase the ventilation capacity of the tower and further optimize the heat exchange effect,providing a reference scheme for optimizing the baffle inside the three towers.