Acid mist pumping, discharging and washing device and acid mist washing method

Abstract

The invention discloses an acid mist pumping, discharging and washing device and an acid mist washing method, belonging to the technical field of acid mist washing during cold-rolling pickling. The acid mist pumping, discharging and washing device comprises a separator, a washing tower, a pumping and exhausting fan and an acid mist pumping and exhausting pipeline, wherein a pre-washing system is connected with and arranged between the separator and the washing tower; the pumping and exhausting fan is connected with and arranged on the acid mist pumping and exhausting pipeline located between the pre-washing system and the washing tower; the pre-washing system comprises a spraying assembly arranged in the acid mist pumping and discharging pipeline, and a pressure stabilizing assembly and awater supply assembly which are connected with the spraying assembly; and the spraying direction of the spraying assembly is opposite to the flowing direction of acid mist. The acid mist pumping, discharging and washing device provided by the invention has the following beneficial effects: the overall structural design is reasonable; the acid mist can be pre-washed and absorbed before entering thewashing tower, and then enters the washing tower for secondary absorption; the content of HCL in tail gas washed by the washing tower reaches 20 PPM or below, so the national environmental protectionrequirement can be met; meanwhile, the washing effect of the acid mist and the utilization rate of water resources are improved, and the cost of washing is reduced.

Description

technical field [0001] The invention relates to the technical field of cold-rolled pickling and acid mist washing, in particular to an acid mist extraction and washing device and an acid mist washing method. Background technique [0002] The production tail gas produced by pickling acid tank contains a large amount of water vapor and hydrogen chloride gas. Hydrogen chloride gas is a poisonous and harmful gas, which is discharged into the atmosphere to form acid rain, which seriously pollutes the environment and is a key monitoring indicator for environmental protection. The cold-rolled pickling plate unit is a production line put into operation in 2012. The environmental protection indicator HCL content of the acid mist washing system in the process section is less than 40PPM. After the implementation of the "New Environmental Protection Law" in 2015, environmental protection requires that the HCL content of pickling tail gas be less than 20PPM. At present, after the envir...

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