Pressure cleaning method and system of candle type demister

Abstract

The invention discloses a pressure cleaning method and system of a candle type demister and belongs to the technical field of sulfuric acid production. The pressure cleaning method comprises the following steps: through an alkali storage tank, a water storage tank and a cleaning device, feeding clear water, and carrying out preliminary washing under the hydraulic pressure of 0.05-0.1Mpa; then, feeding alkali liquor and clear water, after concentration regulation, soaking airtightly and discharging out; and finally, feeding clear water to form hydraulic pressure of 0.05-0.1Mpa in the cleaning device, and carrying out final washing. During the pollution discharge process, fall-off acid mud and other impurities are rushed out, and cleaning is finished after the pH value of a drain outlet is neutral. The pressure cleaning method and system can effectively prevent the damage problem of the candle type demister and are thorough in cleaning to improve the demisting quality of the candle typedemister and meet the production demand of sulfuric acid.

Description

technical field [0001] The invention relates to a cleaning system for a mist eliminator, in particular to a pressure cleaning method and system for a candle type mist eliminator, belonging to the technical field of sulfuric acid production. Background technique [0002] At present, in the sulfuric acid production process, in order to reduce the formation of condensed acid in the sulfuric acid production system and reduce the concentration of acid mist in the tail gas, the drying tower, the first suction tower and the second suction tower of the sulfuric acid production system are equipped with defogging Among them, the first suction tower and the second suction tower use candle demisters. The main function of the candle demister is to remove S0 3 The acid mist and acid mud entrained in the absorption process can reduce the generation of condensed acid at the back end and the content of acid mist in the tail gas, and achieve environmental protection and discharge standards. ...

AI Technical Summary

Problems solved by technology

[0004] 1. The water gun is used for direct flushing, and the pressure of the water gun is relatively high, forming a water column of the water gun, which has a strong impact on the fiber layer in the demister and causes damage to the demister; due to the single flushing point, the fibers in the demister Uneven impingement of layer formation, resulting in clumping of fibers, formation of cavities, uneven flushing, and complete flushing of all fibers cannot be guaranteed

When the candle type mist eliminator is used again, a large amount of acid mist gas will pass through the fiber cavity, which cannot effectively capture the acid mist, causing the back-end condensed acid to exceed the standard, corroding the system equipment, and the tail gas cannot be discharged up to the standard, causing environmental pollution;

[0005] 2. Use the alkaline water pool to soak and wash. Because there is no power to wash, the acid mud can only rely on the alkali solution to soak and fall off naturally, which makes the cleaning cycle longer. At the same time, there are still some acid mud that has fallen off. Effective cleaning will affect the demisting effect of the candle demister when it is used again

In the cleaning process, the combination of alkali cleaning and pickling is used, which can only be used for general non-metallic demisters; during the pickling process of metal demisters, the dilute acid produced by pickling will affect the metal of the demister. Structural parts cause corrosion, which affects the service life of the mist eliminator

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