Demisting and dedusting functions integrated PTFE fiber felt filter material

Abstract

The invention discloses a demisting and dedusting functions integrated PTFE fiber demister. The demister has the resistance to high temperature and acid and alkali corrosion. A demister cylinder mouldis an integral welding structure; and a PTFE fiber felt is wound around the demister cylinder mould and is fixed on the demister cylinder mould with the help of a nylon, polypropylene, polypropylenefiber or acrylic fiber cloth or silk yarn. The demister can be used for removing mist droplets and particles in the rectification, absorption, extraction and other industrial production processes of aliquid, has a very good removal effect on mist droplets of 98% concentrated acid and an alkaline solution containing 10 mol/L of hydroxide ions, allows the removal efficiency of the mist droplets with the diameter of 2-10 [mu]m to reach up to 99.9%, and makes the concentration of a discharge opening be less than 5 ppm and reach national atmospheric emission standards. The demister can tolerate strong acid or strong alkali mist droplets and particles in four years of applications, and keeps high and stable hydrophobicity.

Description

technical field [0001] The invention relates to a filter material of PTFE fiber felt which integrates functions of fog and dust removal. Background technique [0002] Haze weather can lead to poor atmospheric visibility, and particulate matter can cause a series of respiratory diseases after being absorbed into the human body. The formation of smog is closely related to the secondary dust formed under relatively high humidity such as ammonium sulfate and ammonium nitrate, among which ammonium sulfate is generally converted from sulfur dioxide, and is used to treat tail gas generated in industrial processes such as coal-fired power plants, sulfuric acid industry, and smelting Incomplete desulfurization is one of the main reasons for excessive sulfur content in the atmosphere. [0003] The most common method of tail gas desulfurization treatment is wet flue gas desulfurization, but during the operation of the wet absorption tower, due to the high gas velocity, it is easy to e...

AI Technical Summary

Problems solved by technology

However, the small droplets usually contain dilute acid or alkali in the absorbent formed by absorbing sulfur-containing tail gas. After the fiber mat is infiltrated by acid or alkali for a long time, its surface hydrophobicity will deteriorate sharply, which will cause the small droplets on the fiber mat. surface infiltration

On the one hand, it will increase the weight of the fiber mat and deform under the action of gravity, causing the gas to escape from the area with low resistance, and the treatment effect will be poor; on the other hand, the infiltration of small liquid droplets will make the void ratio of the fiber mat decreases, the flow path becomes narrower, resulting in a sharp increase in resistance

Therefore, the current fiber mat products all have the problem of short service life, and it is easy to cause secondary PM 2.5 emissions

[0005] PTFE is a strong hydrophobic material, and has the advantages of high temperature resistance and acid and alkali corrosion resistance. The method of coating a layer of polytetrafluoroethylene (PTFE) film on the surface of the fiber felt can solve the problem of corrosion of the droplet to the fiber felt , but the tiny droplets that are not completely trapped by the PTFE membrane will still pass through the PTFE membrane and cause damage to the fiber mat, which still cannot solve the problem of short life of the fiber mat due to droplet corrosion