Tail gas recovery system of kiln

Abstract

The invention discloses a tail gas recovery system of a kiln. The tail gas recovery system comprises a tail gas collection system, a dust treatment system, a first purification system, a fractionation system and a gas mixing system which are sequentially connected through pipelines; and a gas inlet of the tail gas absorption system is communicated with an exhaust port of the kiln, and a gas outlet of the gas mixing system is communicated with a gas inlet of the kiln. The system can meet the requirement of part of materials for the high oxygen content in the kiln, the problem that in the prior art, the product quality is unqualified due to the fact that the oxygen concentration required by the process cannot be met after tail gas is recycled is solved, good overall sealing performance is achieved, the problem that the oxygen concentration is reduced due to air entering is solved, use is flexible, adjustment can be carried out according to different situations, the cost of recycling and oxygen using is minimized, waste heat of all positions is fully utilized, and the production cost when the system is started is further reduced.

Description

technical field [0001] The invention relates to the technical field of gas separation, in particular to a tail gas recovery system of a kiln. Background technique [0002] In many processes, kilns are used for aerobic or even high-oxygen sintering operations, such as the battery field, especially the positive electrode material for high-nickel ternary lithium-ion batteries. [0003] High nickel ternary lithium ion battery cathode material LiNi 1-x-y co x mn y o 2 (NCM) has been widely used in the field of lithium-ion power batteries due to its advantages of high specific capacity, low cost and excellent safety. A large amount of oxygen is continuously introduced into the kiln to ensure the atmosphere in the furnace. The tail gas produced by these processes generally contains oxygen with a high proportion of components. Among the traditional treatment methods, it is generally discharged directly as waste gas after environmental protection treatment, but this treatment me...

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Problems solved by technology

[0005] (1) In the existing technology, the kiln exhaust gas is generally directly reused in the pre-sintering process after simple treatment. For some sintering processes that require high oxygen content, the oxygen concentration cannot meet the process requirements, and it is easy to sinter to obtain products. The quality does not meet the requirements;

[0006] (2) The existing technology does not utilize the waste heat of the exhaust gas, and often requires additional facilities to cool the exhaust gas and heat up the recovered gas, resulting in high production costs

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