Performance Optimization Of Thermal Power Plant Cooling Tower With Smoke Injection Based On Three-dimensional Numerical Simulation

As an important auxiliary equipment of the thermal power plant using rankian cycle,the performance of the cooling tower directly affects the economy and environmental protection of the whole generating set.As an energy saving and emission reduction technology based on the cooling tower,the smoke tower integration technology,with its excellent environmental protection and economy,is gradually widely used in thermal power plants at home and abroad.As the name implies,the combination of smoke tower and "cooling tower" is to combine the "chimney" and "cooling tower" together,eliminate the traditional chimney and its affiliated equipment,and directly discharge the desulfurized net flue gas into the cooling tower.This kind of smoke exhaust method can increase the height of the smoke,reduce part of the investment maintenance cost,and slightly improve the efficiency of the cooling tower.Two-phase circulating heat and mass transfer theory this paper combined with the packing area of heat and mass transfer model is established,and connecting with the built-in model of commercial simulation software Fluent,complete natural rheumatism type cooling tower numerical simulation model,and then through the field test data of the model is verified,the verification results conform to the engineering thermodynamic calculation accuracy,for subsequent smoke tower on the research content of the unity of laid a good foundation;Finally,the additional resistance of dispersed smoke exhaust device is verified and calculated,and the reasonable research range is determined.Next,this paper proposes a distributed arrangement flue gas emission method,and studies its radial distance and inlet quantity.It is found that the efficiency of natural wind dry and wet cooling tower discharging flue gas in this way will increase with the increase of radial distance and quantity of flue gas outlet.And on this basis,this paper also puts forward a kind of flue gas in the Angle of incidence of flue gas,this way can make cooling tower flue gas and wet air rise by swirling,ascending the draught cooling tower,thus to further increase cooling efficiency,when the incident Angle and hyperboloid cooling tower bus parallel,cooling tower efficiency is the largest.Under the condition that the radial distance,quantity and incidence Angle of the flue gas outlet reach the optimal value,the influence of the flue gas flow rate on the water temperature of the outlet tower is investigated.Compared with the conventional integrated cooling tower,when the flue gas flow rate is 200%of the rated flue gas flow rate,the water temperature of the outlet tower decreases by 1.12 k.Finally,on the basis of the no-wind model,the numerical simulation model of the dispersed smoke exhaust cooling tower under the condition of crosstalk wind is established,and the parameter sensitivity i5 verified.Through simulation,it i5 found that the eooling effect of the dispersed smoke exhaust cooling tower is poor when the wind speed is less than 9 m/s,and good when the wind speed is more than 9m/s.The plume elevation is lower than that before the optimization,because the crosstalk wind destroys the spiral flow generated by the dispersed smoke exhaust,and the energy in the flue gas is lower,but the environmental performance is better than before the optimization,because the flue gas and air mix more fully during the dispersed smoke exhaust.