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Preparation method of high-temperature-resistant filtering material

A filter material and high-temperature-resistant technology, which is applied in separation methods, filtration separation, membrane filters, etc., can solve problems such as unsatisfactory high-temperature resistance performance, inability to withstand instantaneous high temperature, and exhaust gas that cannot meet emission requirements.

Active Publication Date: 2020-10-23
山东兴国新力环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First of all, the existing filter materials have unsatisfactory high temperature resistance. They can only be used for a long time at a temperature of 280~295°C, but cannot withstand instantaneous high temperatures above 310°C.
The existing continuous waste gas treatment process of dust removal, desulfurization and denitrification is a continuous process. It is often used to remove dust with dust removal equipment containing filter materials, and then pass the dust-removed waste gas into the desulfurization tower and denitrification tower for desulfurization and denitrification. The desulfurization and denitrification process requires that after filtration The temperature of the exhaust gas is above 280°C, otherwise the effect of desulfurization and denitrification will be affected, so the exhaust gas cannot be cooled before it passes through the filter material
In the actual industrial waste gas, the temperature of the waste gas fluctuates. The conventional temperature is 280~295°C, but there will be an instantaneous ultra-high temperature of 310~320°C, which will cause the existing filter material to be damaged, hardened, and lose its filtration performance.
[0005] Second, the existing filter material has a short lifespan
When used at an exhaust gas temperature of 280~295°C, the existing filter material can only be used for half a year to a year, and problems such as damage, hardening, and delamination will occur. Repeated replacement of filter bags will lead to an increase in dust removal costs
And if the instantaneous temperature of the exhaust gas exceeds 310°C, the existing filter material can only continue to be used for 1 to 3 days
If the filter material is damaged and delaminated, it will not be able to effectively remove dust, resulting in exhaust gas that cannot meet the emission requirements; if the filter material is hard, it will cause the filter material to be airtight, and it will also not be able to effectively remove dust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The method of this embodiment includes the following steps:

[0057] 1) Mixing: Mix basalt fiber and polybenzimidazole fiber at a weight ratio of 4:1, and mix them in layers. First lay a layer of basalt fiber, then lay a layer of polybenzimidazole fiber, repeat the above operation 4 times, obtain mixed fibers;

[0058] 2) Opening: the mixed fibers are roughly opened and finely opened, and then sent to a carding machine for carding to form a mixed fiber web;

[0059] 3) Laying: The mixed fiber net is cross-laid on the upper and lower surfaces of the basalt base cloth. The number of cross-laid net layers is 8 layers of mixed fiber net for the upper fiber layer, and 8 layers of mixed fiber net for the lower fiber layer to form the upper fiber Layer and lower fiber layer, the weight of the upper fiber layer is 200g / m 2 , the weight of the lower fiber layer is 200g / m 2 , Laying environment temperature 20 ~ 35 ℃, relative humidity 40 ~ 75%, to obtain plain felt;

[0060] ...

Embodiment 2

[0065] The method of this embodiment includes the following steps:

[0066] 1) Mixing: Mix basalt fiber and polybenzimidazole fiber at a weight ratio of 3:1, and mix them in layers. First lay a layer of basalt fiber, and then lay a layer of polybenzimidazole fiber. Repeat the above operation 4 times. obtain mixed fibers;

[0067] 2) Opening: the mixed fibers are roughly opened and finely opened, and then sent to a carding machine for carding to form a mixed fiber web;

[0068] 3) Laying: The mixed fiber net is cross-laid on the upper and lower surfaces of the basalt base cloth. The number of cross-laid net layers is 8 layers of mixed fiber net for the upper fiber layer, and 7 layers of mixed fiber net for the lower fiber layer to form the upper fiber Layer and lower fiber layer, the weight of the upper fiber layer is 220g / m 2 , the weight of the lower fiber layer is 190g / m 2 , Laying environment temperature 20 ~ 35 ℃, relative humidity 40 ~ 75%, to obtain plain felt;

[00...

Embodiment 3

[0074] The method of this embodiment includes the following steps:

[0075] 1) Mixing: Mix basalt fiber and polybenzimidazole fiber at a weight ratio of 3.5:1.5, and use layered superposition and mixing. First lay a layer of basalt fiber, then lay a layer of polybenzimidazole fiber, repeat the above operation 3 times, obtain mixed fibers;

[0076] 2) Opening: the mixed fibers are roughly opened and finely opened, and then sent to a carding machine for carding to form a mixed fiber web;

[0077] 3) Laying: The mixed fiber net is cross-laid on the upper and lower surfaces of the basalt base cloth. The number of cross-laid net layers is 8 layers of mixed fiber net for the upper fiber layer, and 7 layers of mixed fiber net for the lower fiber layer to form the upper fiber Layer and lower fiber layer, the weight of the upper fiber layer is 210g / m 2 , the weight of the lower fiber layer is 180g / m 2 , Laying environment temperature 20 ~ 35 ℃, relative humidity 40 ~ 75%, to obtain ...

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Abstract

The invention discloses a preparation method of a high-temperature-resistant filtering material and belongs to the technical field of filtering and dedusting materials. The method comprises the stepsof 1) mixing, 2) opening, 3) lapping, 4) needling, 5) dipping and 6) film covering. The mixing process comprises: uniformly mixing basalt fibers and polybenzimidazole fibers according to a weight ratio of (3-4): (1-2), and the dipping process comprises: padding the needled felt in the treatment liquid, wherein the pick-up rate is 29-33%, drying at the temperature of 190-220 DEG C, baking at the temperature of 250-320 DEG C, controlling the drying and baking speed to be 4-5m / min, and rolling, wherein the treatment liquid is prepared from the following components in percentage by mass: 15 to 26percent of polytetrafluoroethylene dispersion liquid, 2 to 6 percent of dimethyl diphenyl polysiloxane, 0.7 to 3 percent of 3-aminopropyltriethoxysilane, 0.5 to 1 percent of Tween and the balance of water. The filtering material has good high temperature resistance, can resist the temperature of 280-295 DEG C for a long time, can resist the temperature of 320 DEG C instantaneously, and has the service life of 2 years or longer.

Description

technical field [0001] The invention discloses a preparation method of a high-temperature-resistant filter material, which belongs to the technical field of filter and dust removal materials. Background technique [0002] The filter material refers to the non-woven filter felt made of basalt fiber, which can be used to make filter bags, which are installed in dust removal equipment for dust removal of industrial waste gas. Most of the existing filter materials are made of basalt fiber, which is combed into a web, and then combined with the base cloth to form a filter felt; then the filter felt is impregnated with an impregnating solution to increase the strength. With the enhancement of environmental awareness, filter materials are widely used, and are often used in the continuous waste gas treatment process of dust removal, desulfurization and denitrification. [0003] The applicant found in the research that the existing filter materials have the following problems: [0...

Claims

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Application Information

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IPC IPC(8): B01D39/00B01D46/02D04H1/4382D04H1/4374D04H1/46D06M15/256D06M15/643D06M13/513D06M15/53D06M101/30
CPCB01D39/00B01D46/02D04H1/4382D04H1/4374D04H1/46D06M15/256D06M15/643D06M13/513D06M15/53B01D2239/10D06M2101/30Y02A50/2351
Inventor 沈照旭董湘琳齐贵山宋传波蒋树军逯元斌任会涛申士海
Owner 山东兴国新力环保科技股份有限公司
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