Study On Optimization Of Flow Field Of Sintering Flue Gas Limestone-gypsum Wet Desulfurization Tower

The SO₂ emissions of the iron and steel industry account for a large proportion of the overall industrial emissions,and sintering SO₂ is the main source of its emissions.Therefore,the development of my country's sintering flue gas desulfurization technology,reduction of SO₂ emissions in the sintering process,and promotion of energy conservation and emission reduction in the iron and steel industry are major issues that need to be solved urgently.The limestone-gypsum wet wet desulfurization technology has the characteristics of stable system operation,large amount of flue gas treatment and high removal efficiency,and there is still a good room for development in the purification of sintering flue gas.At present,researchers mainly prefer power plant boiler flue gas when optimizing the desulfurization tower of this technology,and the predecessors have done less research on the simulation and optimization of the flow field of the sinter flue gas desulfurization tower with a large amount of flue gas,and the reliability verification of some tests is not full.Numerical simulation of a limestone-gypsum wet desulfurization tower in a steel company was carried out through CFD technology.The results obtained from the study were compared with the experimental and recorded data,and there was a high degree of fit,which explained the research method of CFD in the desulfurization tower There is a high degree of credibility in it.In the optimization design of the flow field in the large-scale spray absorption tower,the simulation results of the influence of the operating parameters of the desulfurization tower on the flow field show that the increase in the liquid-to-gas ratio can significantly improve the desulfurization effect,but the degree of improvement does not increase linearly with the liquid-to-gas ratio From the perspective of comprehensive cost performance,it is more appropriate for the liquid-to-gas ratio(L/G)of the desulfurization absorption tower to be controlled at about 7-9 L/m3;the increase in the flue gas flow rate within the range can effectively improve the stability of the gas phase in the tower.The flow rate will affect the density distribution in the cross section of the slurry and the residence time in the tower,increase power consumption and reduce the desulfurization effect.The simulation results of the effect of the spray layer layout of the desulfurization tower on the flow field show that a too low spray layer spacing will increase the spray slurry density,affect the uniformity of the air flow and reduce the mass transfer surface,and the height of the spray zone should not be too high.High,increasing the height is not economical for the improvement of efficiency,the layer spacing should be a moderate value;appropriately increasing the nozzle spacing can effectively improve the uniformity of the air flow.The simulation results of the influence of the structure change of the desulfurization tower on the flow field show that the addition of a tower ring under the lowest spray layer can significantly improve the desulfurization effect in the central area of the tower,and at the same time,it can also increase the utilization rate of the slurry.The best installation position of this model is The distance from the lowest spray layer is 1.5m;in terms of flow field uniformity and operating energy consumption,straight out of the tower top is the best outlet method.When side out,the flow field in the tower on the same side is better than that on the opposite side,but The total tower pressure loss is greater;adding an inclined plate at the outlet to the side wall can improve the uniformity of airflow distribution in the tower without increasing energy consumption,and promote gas-liquid heat and mass transfer.