| Ordinary vertical spray tower has high desulfurization efficiency,large investment and operation cost,large equipment area,and long desulfurizer circulation process.Horizontal wet desulfurization tower has the characteristics of low investment,less pressure loss,non-stop maintenance,full spray coverage,high desulfurization efficiency and wide adaptability.At present,the emphasis of horizontal wet desulfurization tower is to establish the mathematical model of computer simulation calculation based on the experimental results of gas-liquid two-phase flow in the desulfurization tower,which will provide some reference value for further design and popularization of the engineering application of horizontal wet desulfurization tower.According to the engineering site conditions,the structure of horizontal wet spray tower flue gas desulfurization reactor with 6.0×105 Nm3/h flue gas treatment capacity was designed and optimized by using simulation software Fluent 17.0.According to the working characteristics and requirements of the structure of spray tower,the selection of spray system,the setting of absorption zone of desulfurization tower,the design of inlet,the design of diversion plate and the layout of spray were designed and optimized respectively.The results show that the sprinkler system chooses spiral hollow nozzle system.The tower is designed to be 26(m)×5.7(m)×9.8(m),and the inlet mode of the gradually expanding square tube.The angle of the X axis downward to the downward direction reaches 75.Setting up 7 diversion plates,the spray height is 6.3m,the spray angle of the nozzle is between 90°?120°,the smoke flow in the absorption area is the most homogeneous and the flow velocity is between 3?5m/s.The average measured value is 4.5m/s,the double spray layer is arranged,the spray cone angle is 100 °,the installation height of the upper spray layer is 0.9 m from the top,and the spray height of the lower layer is 2.4 m,so the operation plan is optimal.The numerical simulation results are basically in agreement with the pilot test results,which verifies that the mathematical model established by the simulation can better reflect the actual situation of gas-liquid two-phase flow in the horizontal wet spray tower.The velocity field,pressure field and temperature field of the optimized horizontal wet desulfurization tower are analyzed and verified.When the flue gas flow rate reaches 5.5 ×105Nm3/h,the velocity difference between upper and lower flue gas is small,and the velocity variation of upper and lower flue gas tends to be stable and small.The difference of flue gas velocity between upper and lower layers is small,and the flue gas velocity is between 3m/s-5 m/s,which is beneficial to the contact and mixing of flue gas and desulfurization slurry.The pressure loss in the tower changes steadily.The temperature of flue gas in the tower is between 320 K-350 K,which satisfies the temperature conditions of flue gas desulfurization reaction and is conducive to flue gas desulfurization.Because of the complexity of the field desulfurization system,the flue gas inlet flow rate should be6.0×105Nm3/h.The experimental verification of the optimized horizontal spray tower shows that when the flue gas inlet flow rate is 600,000 Nm3/h,the liquid-gas ratio(L/G)is 22,the PH value of desulfurization slurry is 6.5,the inlet flue gas temperature is 80?,the SO2 concentration in the inlet flue gas reaches 1200 mg/Nm3,and the inlet flue gas velocity is 3.5m/s,the desulfurization efficiency of the optimized horizontal spray tower reaches more than 93%.After optimization,the flue gas desulfurization efficiency of horizontal spray tower is over 93%.After optimization,the flue gas desulfurization efficiency of horizontal spray tower is increased by about 5%. |
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