The Study On Hydrodynamics And Desulfurization Characteristics In Duble Nozzles Rectangular Draft Tube Spouted Bed

In order to increase sorbent utilization and efficiency of SO₂ removal and resolve industrial application problem of spouted bed technique in FGD.A new equipment of semi-dry desulfurization for the double nozzles rectangular draft tube spouted bed was proposed in this paper. The hydrodynamics characteristics for the double nozzles rectangular draft tube spouted bed was studied. Some effects were tested for particle diameter,flow rate,bed height, draft tube diameter and height of entrainment zone on minimum spouted velocity , spouted pressure drop and spouting height at different operation condition. The formulas of minimal spouted velocity,maximal spouted pressure drop and the spouting height were put forward. Some effects on SO₂ removal were studied, such as Ca/S molar ratio,inlet concentration of SO₂,static bed height,gas inlet temperature,approach to saturation temperature,spouted velocity. SO₂ removal efficiency was enhanced by increasing Ca/S molar ratio,inlet concentration of SO₂,static bed height and decreasing gas inlet temperature,approach to saturation temperature,spouted velocity. Hydrodynamics and desulfurization characteristic were compared for rectangular draft tube spouted bed and rectangular spouted bed and conical-cylindric spouted bed. The experimental results indicated that rectangular draft tube spouted bed had better hydrodynamics and dryness characteristic than rectangular spouted bed,and can slower dope of wall,but desulfurization characteristic was worse;Rectangular spouted bed had better hydrodynamics and desulfurization characteristic than conical-cylindric spouted bed.In the end,the mathematic correlative formula was proposed and experimental result was agreed with calculational result.