Tail gas recovery system and process in naphthalene flaking and packaging process

Abstract

The invention relates to a tail gas recovery system and process in naphthalene flaking and packaging processes. The system comprises a bag-type dust collector, a tail gas fan, a sublimated naphthalene catcher and a naphthalene melting tank; a set of cloth bag dust removal equipment is shared in the naphthalene flaking and packaging processes; tail gas of a rotary drum crystallizer firstly enters the sublimation naphthalene catcher to be fully cooled before entering the bag-type dust collector, so that the naphthalene steam amount in the tail gas is greatly reduced, and the tail gas is finally cooled and dedusted through the bag-type dust collector to realize up-to-standard emission; and naphthalene dust collected by the bag-type dust collector is fed into the naphthalene melting tank, is heated and melted by liquid refined naphthalene and then is fed back to the rotary drum crystallizer for flaking.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment of high-naphthalene-containing dust from a tar distillation device in the coking industry, in particular to an industrial naphthalene or refined naphthalene flake and packaging process tail gas recovery system and process. Background technique [0002] Naphthalene is the main product of coal tar processing, accounting for about 10% to 12% of coal tar. It is an important basic raw material for organic chemicals and is widely used in the production of dyes, drugs and other products. The naphthalene produced from coal tar includes industrial naphthalene and refined naphthalene. The crystallization point of industrial naphthalene is not less than 78°C, and the naphthalene content is ≥95%. The separation and refining of naphthalene is an important link in coal tar processing and an important way to obtain naphthalene. In current production, fractional crystallization is an important method ...

AI Technical Summary

Problems solved by technology

[0005] At present, the tail gas treatment of the drum crystallizer basically adopts a bag filter, and the sublimated naphthalene recovered by the bag filter is collected manually, and then manually put into the naphthalene fraction tank, which is labor intensive and not environmentally friendly; in addition, the tail gas of the drum crystallizer It not only contains naphthalene dust, but also a certain amount of naphthalene vapor. The bag filter is not enough to cool and recover all the naphthalene vapor. The tail gas discharged into the atmosphere through the bag filter still has naphthalene vapor remaining, thus causing environmental pollution.

[0006] However, naphthalene dust is generated during the operation of the packaging machine. For manual packaging machines and semi-automatic packaging machines, the operating environment is relatively difficult, and operators need to wear protective equipment; for automatic packaging machines, although they are equipped with dust removal equipment, However, it is still necessary to manually collect the recovered naphthalene dust, and then manually put it into the naphthalene fraction tank

[0007] At present, the flaking process of naphthalene and the tail gas treatment of the packaging process are independent, which increases the cost of equipment, takes up valuable space, and cannot realize fully automated operation, so there is a need for improvement

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