Numerical Simulation and Structural Optimization of High Temperature Flue Gas Water-cooled Heat Exchange Pipe
The high temperature on the flue gas side of the flue gas water-cooled heat exchanger can raise temperature of the heat exchange tube quickly and the insufficient heat absorbed by cooling water will overheat the heat exchange tube and burst.In this paper,having FLUENT software adopted to simulate new flue gas quenching cooler's heat exchange tube and optimize its structure was implemented.The re-sults show that,high temperature at the inlet side of the flue gas and the fast flow rate,as well as high wall temperature of the heat exchange tube can incur cooling water's film boiling outside the heat exchange tube.The numerical simulation results show that,compared with the circular heat exchanger,the distribu-tion of water vapor generated on the cooling water side becomes more uniform and the local water vapor is not excessive at the wall.At the same time,the wall's maximum temperature of the heat exchanger tube can be reduced by about 265 K and the wall's average temperature there reduced by 4.8%to 8.3%.Inves-tigating the effect of flue gas treatment on heat exchange pipe indicates that,with the increase of flue gas treatment,both outlet temperature of flue gas and wall temperature of heat exchange pipe rises.Under the same amount of flue gas treatment,the heat absorbed by the cooling water outside the profiled tube is more than that absorbed by the cooling water outside the circular tube.
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