Study On New-style Fluid Bed For Pot Fume Dry-scrubbing

During the process of Aluminum smelting, a large amount of poisonous gas HF will be released, which will do great harm to the health of people and the growth of plants. So to scrubbing the pot room fume,to reclaim fluoride in the fume and to control the exhaust of pollutant is very important.Currently dry-scrubbing methods are mostly used all over the world. Because 90 to 95 percents of the absorption is achieved in the reactor, dry-scrubbing reactors become most important equipments in the dry-scrubbing process.In this paper, new-style charging equipment for purifying will be researched to help the alumina (Al2O3) in the fume adsorbed by the alumina, which was mixed with fume in the pot equably and sufficiently.Difference between new-style fluid bed and traditional one is that three-dimensional wire reticulation board is used for gas distribution plate. Experiment indicated that pressure loss of it is only 1/77 of pressure loss of level jet board.In new-style fluid bed, alumina is used as streaming material. Flow state and pressure loss are selected as assessment indicators. Wind speed, height of the static alumina, tiers of the wire reticulation and quantity of the feeding alumina are selected as affecting factors. Then orthogonal test tabulation is designed. Through experiments, the best operating parameters of the fluid bed are got.To 0°level gas distribution plate, air flux affects experimental results most,followed by three other factors——alumina flux, tiers of the wire reticulation and height of static alumina. Four factors compose optimal condition in this way——tiers of the wire reticulation are 4, air flux is 70m3/h, height of static alumina is 30mm, alumina flux is 2.5kg/h.To 2.5°oblique gas distribution plate, air flux affects experimental results most,followed by three other factors——height of static alumina, alumina flux and tiers of the wire reticulation. Four factors compose optimal condition in this way——tiers of wire reticulation are 4, air flux is 70m3/h, height of static alumina is 30mm, alumina flux is 5kg/h.To 5°oblique gas distribution plate, height of static alumina affects experimental results most,followed by three other factors——air flux, tiers of wire reticulation and alumina flux. Four factors compose optimal condition in this way——tiers of wire reticulation are 3, air flux is 70m3/h, height of static alumina is 30mm, alumina flux is 5kg/h.