Device and method for removing particulate matters in hydrochloric acid regeneration roasting flue gas

Abstract

The invention relates to the technical field of hydrochloric acid waste liquid regeneration treatment, in particular to a device and method for removing particulate matter in hydrochloric acid regeneration roasting flue gas. The device comprises a Venturi preconcentrator and an absorption tower which are sequentially arranged in the flowing direction of roasting flue gas, the gas output end of the absorption tower is connected with a flue gas pipeline, the roasting flue gas enters the next process through the flue gas pipeline, and at least one dust removal device is arranged on the flue gas pipeline. The dust removal device comprises at least one coagulator which extends into the flue gas pipeline and is used for spraying, the bottom of the flue gas pipeline is connected with a collecting tank, a solution in the collecting tank can be circulated into the absorption tower for spraying, and the dust removal device further comprises a liquid pipeline and a compressed air pipeline which are connected with the coagulator. The device can solve the problems that particulate matters in tail gas of a traditional hydrochloric acid regeneration process, an existing acid regeneration station and the like cannot reach the standard and even exceed the standard for emission and the like, is particularly suitable for old acid regeneration systems which are limited by sites and are difficult to transform, solves the problem that emission does not reach the standard, and saves the cost.

Description

technical field [0001] The invention relates to the technical field of regeneration and treatment of hydrochloric acid waste liquid, in particular to a device and method for removing particulate matter in flue gas of hydrochloric acid regeneration and roasting. Background technique [0002] At present, the regeneration treatment method of industrial hydrochloric acid waste liquid is generally spray roasting method or fluidized bed method. After cooling, it enters the absorption tower for HCl absorption. The flue gas after passing through the absorption tower adopts different process routes according to the environmental protection emission requirements; the conventional hydrochloric acid regeneration process can no longer meet the current national and upcoming ultra-low emission standards, especially some In the earlier generation of units, some hydrochloric acid regeneration units even have the problem of serious pollutant discharge exceeding the standard. In addition, bec...

AI Technical Summary

Problems solved by technology

After being treated by the above equipment, the concentration of particulate matter emitted from the acid regeneration chimney is generally 30mg / Nm 3 , it is difficult to meet the ultra-low emission particulate matter concentration of less than 10mg / Nm 3 requirements, especially for a period of time before and after cleaning the acid gun, due to large fluctuations in the negative pressure of the system, the emission concentration of particulate matter will fluctuate greatly

Dust removal by means of adding other dust collectors will increase equipment and operating costs. In addition, for many hydrochloric acid regeneration stations that have been put into operation, due to site and space constraints, there is no way to add new dust removal equipment, resulting in cannot be retrofitted

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