Equipment for collecting and processing acidity mist

Abstract

The invention discloses an acid mist collection and treatment device, comprising an acid mist collection mechanism, an acid liquid recovery mechanism for gas-liquid separation, an acid mist pretreatment mechanism, an acid mist treatment mechanism, a fan, an exhaust chimney and a corresponding connecting pipeline. The acid mist collecting mechanism is connected with the rinsing tank and the pickling tank to collect the acid mist generated by the rinsing tank and the pickling tank respectively. The mist pretreatment mechanism is installed before the acid mist treatment mechanism to pretreat the acid mist entering the acid mist treatment mechanism. The acid mist treatment mechanism washes and absorbs the acid mist, and the fan is connected between the acid mist treatment mechanism and the exhaust chimney. The exhaust gas produced by the acid mist treatment mechanism is discharged through the exhaust chimney. The acid mist collection and treatment device of the invention can be applied to the waste gas treatment system in the field of strip steel surface treatment such as pickling in the iron and steel industry, has the advantages of water saving, reduction of waste gas and waste water pollution, etc., and has obvious economic and environmental benefits.

Description

technical field [0001] The invention relates to an environmental protection device, in particular to an acid mist collection and treatment device. Background technique [0002] At present, the cold rolling field in the metallurgical industry involves many strip surface treatment processes, such as strip pickling units, electroplating units, etc., and these units are equipped with acid mist treatment systems. In these systems, the hydrochloric acid mist of the strip pickling unit is the most difficult kind of acid mist to deal with. In the pickling unit, pickling is required to remove the oxide scale on the surface of the hot-rolled coil. The key equipment for the pickling unit to remove the oxide scale on the surface of the hot-rolled strip steel is the acid tank-by controlling the temperature and concentration of the HCl solution in several acid tanks, it can fully chemically react with the oxide scale on the surface of the strip steel, Decompose the iron in the iron oxid...

AI Technical Summary

Problems solved by technology

[0005] However, the existing acid mist collection and treatment device has the following disadvantages: 1. The water consumption is large; 2. The exhaust gas emission concentration is affected by the change of the acid tank working state, and the exhaust gas emission concentration of the treatment device fluctuates greatly; 3. After the washing and absorption tower The discharged wastewater needs to be further treated, and the large amount of discharged wastewater also increases the load of wastewater treatment, which will cause adverse effects on the environment

[0006] The main reasons for the above shortcomings are: 1. The efficiency of the existing exhaust gas treatment device is low; 2. The HCl content in the absorption medium must be low, so that there is enough transmission force to absorb HCl, resulting in a large water consumption; 3. The pollution factor HCl in the exhaust gas exists in two states of gas and liquid. Among them, the liquid pollution factor is dissolved in the water droplets in the exhaust gas flow. After research, it is found that the liquid pollution factor in the exhaust gas discharged from the scrubbing and absorption tower is higher than the gaseous state. 4. The anti-interference performance of the treatment system is poor. The size of the air volume has a great influence on the concentration of the final waste discharged from the scrubbing and absorbing tower. Once the air volume changes, the concentration at the inlet and outlet of the scrubbing and absorbing tower will also change, which is not conducive to Control of Final Waste Emission Concentration

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