Exhaust gas purification system and method of lithium iron phosphate sintering furnace

Abstract

The invention discloses an exhaust gas purification system of a lithium iron phosphate sintering furnace. The system comprises two groups of purification units; each group of purification units comprises a first purification device and a second purification device; a first inorganic ceramic membrane support column is arranged in the first purification device; a second inorganic ceramic membrane support column is arranged in the second purification device; the inner wall of a second filter through cavity of the second inorganic ceramic membrane support column is covered with an inorganic ceramic membrane layer; exhaust gas of each group of purification units is fed in through an air supply device and an air introducing device; and a backflushing device is used for backflushing each purification unit. Through the optimization design of the waste gas purification system of the lithium iron phosphate sintering furnace; two purification devices are arranged in the purification units; the inorganic ceramic membrane material is utilized to adsorb dust, tar and acid gases such as phosphides, sulfides and the like in the exhaust gas to be filtered; and the treatment effect is ensured. At the same time, with the arrangement of the two groups of purification units, the two groups are used for adsorption, filtration and backflushing circularly and alternately, so that the exhaust gas can be continuously treated, and the service life of the purification units is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium battery raw material preparation, in particular to a waste gas purification system and method of a lithium iron phosphate sintering furnace. Background technique [0002] Petroleum resources are increasingly scarce and environmental pollution is serious. In order to solve the above problems, the development of electric vehicles and hybrid vehicles is one of the main methods. The development of electric vehicles has driven the rapid development of lithium iron phosphate, the cathode material for power batteries. In the process of preparing lithium iron phosphate materials, although the waste gas generated by the sintering process has been processed by high-temperature combustion, it still contains a large amount of harmful fumes such as dust and tar. If it is directly discharged without treatment, it will pollute the environment. Flue gas treatment has attracted much attention. [0003] At present...

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Problems solved by technology

The pre-coating bag filter method has simple equipment, easy operation, and good dust collection effect, but it cannot filter harmful phosphide and sulfide gases, and as the temperature of the exhaust gas decreases, tar is easy to produce scarring on the surface of the bag , block the pores of the bag, and make the dust removal effect of the bag useless; dry adsorption method, no sewage is produced, and the purification efficiency is high. The adsorbent is mostly coke or alumina. The former has good tar adsorption performance, but the ability to absorb acid gas is not high, so there is First, coke is used to adsorb tar, and then alumina is used to adsorb acid gas, etc. This method has two adsorptions, the process is complicated, there are many auxiliary equipment, the consumption of coke and alumina is large, and the treatment cost is high; The absorption capacity of acidic gaseous pollutants such as phosphides and sulfides in the exhaust gas is very poor, and the disposal of the collected sticky matter is very difficult

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