Based On Electrolytic Aluminium Flue Gas Purification With Bag Filter Dust Gas Coordination Control Related Technical Research

With the improvement of the state environmental protection standards and atmosphericpollution problem is increasingly highlighted,dust removal technology of electrolytic aluminiumindustry is also put forward higher requirements. Bag filter is an important part of dry flue gaspurification system used in electrolytic aluminum industry. It is different the conventional bagfilter, but has the function of cooperative contro, on the one hand,the bag filter prompts alumina toadsorb fluorine gas, on the other hand it also filters fluoride aluminadust. So the bag filter is bothone part of the adsorption reaction vessel of thedry purification system and a gas-solid separationdevice. The bag filter has a very important role in the dry process purification system, and thefiltration characteristics directly affect the performance of the dry process purification system.Research on flow field characteristics of bag filter used in electrolytic aluminum, and getdistribution of the internal flow field, and to further analyze the factors affecting the filtercharacteristic of filter bagused in electrolytic aluminum, and it has certain reference significanceto improve the efficiency of thebag filter purificating electrolytic aluminium flue gas. This topic isbased on the filter bag which has the function of cooperative control used in electrolyticaluminium to research the internal flow field structure characteristic and the filter bag filtercharacteristics.The topic from the collaborative control on the inner flow field in bag filter、filter bagboundary condition test、the bag and the matching of filter bag and filter bag cage suturetechnology’s influence on the particle filtering characteristics to research the flow field、concentration field and the technology of filter bag through theoretical analysis, experimentalresearch and numerical simulation analysis.This article also has a comparative study on the difference between the bag filter whichhas the function of cooperative control used in electrolytic aluminium and conventional bag filter.This subject starts from the demand of electrolytic aluminium flue gas coordination controlfunction,to analyze the differences in the device structure and technical conditions of the twotypes of filter bag, and combines with the results of numerical simulation, and further analyzes theeffect of the secondary dust adsorbing the fluoride flue gas caused by the bag filter using ashhopper into the wind as the fixed form.For filter bag stitching process on the influence of particle filtering characteristics, thistopic researches the influence of ordinary polyester,and polyester coated in three differentstitching process to the filtration efficiency of particulate matter. The test analyzes theclassification filtration efficiency of the same filter material under different stitching process thedifferent diameter particles, and the resistance of the filter material under different wind speed.The results show that the filtration efficiency of same filter material under different process wasfollowed by hot melt suture, bold lines, coarse fine needle thread,and the filtration efficiency offilter material in hot melt under the stitching process is higher to1%~2%than in fine needleunder the thick thread stitching process, and is higher to3%~4%than under thick needle thread stitching process. Under different wind speed, the filtration resistance of the the same filtermaterial under different process was followed by hot melt suture, bold lines, coarse fine needlethread, and the filtration resistance is higher to1~2pa of the filter material for hot melt processthan in fine needle under the thick thread stitching process, and is higher to3~4pa than underthick needle thread stitching process.