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Demisting and dedusting functions integrated PTFE fiber felt filter material

A technology of PTFE and fiber felt, which is applied in the fields of filtration and separation, protection of human health, and filtration of dispersed particles. It can solve the problems of secondary PM2.5 emission, gas escape, surface hydrophobicity degradation, etc., and solve the problem of droplet discharge. , solve the effect of short service life and remarkable removal effect

Inactive Publication Date: 2018-07-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (4) The fiber felt filter material used in the present invention is made of PTFE material, its temperature resistance can reach more than 200°C, its breaking strength is greater than 2600N / (5cm), and its performance is much higher than that of traditional fiber filter materials such as polyester and polypropylene. .

[0018] (5) Manufacture of the inner and outer mesh cages of the original demister: use a fully automatic welding machine to weld the inner and outer mesh cages of the demister components, and connect the inner and outer mesh cages of the demister with flanges.

[0019] (6) Filling fiber felt: A thin layer of PTFE fiber felt is rolled on the core tube by rolling winding method to make it have the required filling density, and then put on the outer mesh tube to form an integral component. The whole process is made of nylon, polypropylene fiber or acrylic fiber and other materials for winding and auxiliary fixing to obtain a PTFE fiber defogging element, and ...

Embodiment 2

[0023] With reference to the steps (1)(2)(3) of Application Example 1, a PTFE fiber mist eliminator was prepared.

[0024] PTFE fiber demister can be used in the metal smelting process to treat the acid mist after the initial absorption process. The acid mist concentration can reach 200ppm, which exceeds the national discharge standard, and the droplet diameter is between 2μm-10μm. When applying the PTFE fiber mist eliminator of the present invention to deal with the acid mist. The removal effect on submicron particles and droplets is remarkable. The total area of ​​the fiber felt in the demister is about 15m 2 , During the treatment process, the initial acid concentration is 200ppm, and the gas velocity is 0.5m / min. Under this gas velocity, the pressure drop of the demister is 16Pa, and its demister efficiency can reach 99.9%. The dust concentration at the outlet is less than 5ppm, meeting the national air emission standard.

Embodiment 3

[0026] With reference to the steps (1)(2)(3) of Application Example 1, a PTFE fiber mist eliminator was prepared.

[0027] In application example 3, in order to verify the removing effect of PTFE fiber mist eliminator among the present invention, the total area of ​​fiber mat in the mist eliminator is about 15m 2 , used to remove 99% of concentrated sulfuric acid mist, droplets with a diameter of 10-100μm, the pressure drop of the demister is 18Pa at a gas velocity of 0.4m / min, and the acid mist can be removed continuously for a long time. The results show that the mist removal efficiency of the PTFE fiber mist eliminator can reach 99.5%, and its hydrophobicity does not decrease significantly.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/04B01D46/52
CPCB01D39/04B01D46/528Y02A50/2351
Inventor 张卫东曹颜儒曹中琦
Owner BEIJING UNIV OF CHEM TECH
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