CN111068417B - Fabric-reinforced high silica fiber filter tube and preparation method thereof - Google Patents
Fabric-reinforced high silica fiber filter tube and preparation method thereof Download PDFInfo
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- CN111068417B CN111068417B CN202010003642.2A CN202010003642A CN111068417B CN 111068417 B CN111068417 B CN 111068417B CN 202010003642 A CN202010003642 A CN 202010003642A CN 111068417 B CN111068417 B CN 111068417B
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- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides
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Abstract
The invention discloses a fabric-reinforced high silica fiber filter tube which is characterized by comprising a grid cylinder formed by weaving high silica fibers with high temperature resistance into a grid structure, wherein the inner layer of the grid cylinder is a high silica short fiber coating, and the outer layer of the grid cylinder is a ceramic short fiber coating. And a desulfurization and denitrification catalyst can be attached to the high-silica short fiber coating. The invention uses high-silica fiber which can be weaved and has high temperature resistance to weave and reinforce the grid cloth, thereby greatly improving the mechanical strength of the fiber filter tube and reducing the fracture of the fiber filter tube. In addition, the dust removal, the desulfurization and the denitrification are respectively and mainly arranged through fiber structures on the inner side and the outer side, and the device has the characteristics of high efficiency, good temperature resistance, good repeatability, long service life and the like.
Description
Technical Field
The invention relates to a flue gas dedusting and denitration high silica fiber filter tube for factories such as metallurgy, building materials, glass, cement and the like, and belongs to the technical field of flue gas treatment and filtration equipment.
Background
With the demand of energy conservation and environmental protection, the requirement on industrial emission flue gas is higher and higher at present. The method has definite limit indexes not only for the solid dust, but also for the concentration of sulfide and nitrogen oxide in the flue gas. For example, in the smoke dust discharged by the power plant, the new GB13223-2011 standard stipulates that the smoke dust discharged by a newly-built coal-fired power plant is lower than 30mg/m3，SO2Emission limit of 100mg/m3，NOxEmission limit of 100mg/m3. Other industries such as metallurgy, chemical industry, building materials, glass, cement and the like have similar requirements. Therefore, the desulfurization, denitrification and dust removal process is indispensable. Due to conventional dust removalThe bag cannot bear high temperature, so the conventional method at present is to remove dust after direct desulfurization and denitrification at high temperature. Among all the factors that lead to the deactivation of the SCR catalyst, ash deposition in flue gas is the most complex and most influential one. If the micropores of the catalyst are blocked by the smoke particles, the surface active sites of the catalyst are gradually lost, so that the catalyst is inactivated, and therefore, in the desulfurization and denitrification process, the smoke in the flue gas has a great influence on the desulfurization and denitrification catalyst, and the catalytic effect of the desulfurization and denitrification catalyst is reduced. Therefore, if the dust removal can be carried out before desulfurization and denitrification, the desulfurization and denitrification efficiency can be greatly improved, the use amount of the desulfurization and denitrification catalyst is reduced, and the environmental protection pressure of enterprises is reduced.
The conventional dust removal utilizes a fiber filter bag, which has poor high temperature resistance and durability, and particularly the sealing seam interface is easy to damage in the positive pressure back blowing process.
The invention discloses a catalytic ceramic filter tube and a preparation method thereof, and discloses a catalytic ceramic filter tube which is characterized by a ceramic filter tube substrate, and a catalytic active component layer and a separation membrane which are sequentially coated on the ceramic filter tube substrate.
While CN201820025113 describes an improved ceramic fiber filter tube structure, the patent mainly describes an improved ceramic fiber filter tube structure, the matrix of which is ceramic fiber, commonly called aluminum silicate fiber.
The existing ceramic filter cylinders are all prepared by ceramic fibers, so that the existing ceramic filter cylinders have the defects of low strength and easy breakage of pipes. And the ceramic fibers are short fibers and cannot be woven into fabrics for high-temperature reinforcement. And the breakage of the ceramic fiber filter cartridge basically declares the failure of the whole equipment, thereby greatly influencing the practical application effect. In addition, the product is a single ceramic fiber structure product, large-particle dust and small-particle nitrogen oxides cannot be effectively treated, and the efficiency is low.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the high-temperature-resistant high-silica fiber filter cylinder with the internal fabric reinforcing structure is provided, and the high-temperature mechanical strength of the fiber filter cylinder can be greatly enhanced; and utilize inside and outside two kinds of fiber structure, realize the ladder denitration of removing dust, the skin utilizes thicker ceramic fiber to block off the large granule dust to be difficult for blocking up, and the nexine mainly used adheres to SOx/NOx control catalyst, improves the denitration effect of catalyst.
In order to solve the technical problem, the invention provides a fabric reinforced high silica fiber filter tube which is characterized by comprising a grid cylinder formed by weaving high silica fibers with high temperature resistance into a grid structure, wherein the inner layer of the grid cylinder is a high silica short fiber coating, and the outer layer of the grid cylinder is a ceramic short fiber coating.
Preferably, the high-silica short fiber coating is adhered with a desulfurization and denitrification catalyst.
The invention also provides a preparation method of the fabric-reinforced high silica fiber filter tube, which is characterized by comprising the following steps:
step 1): respectively chopping high silica fibers and ceramic fibers, and then ball-milling in a ball-milling tank for 2-6 h;
step 2): filtering the ground high silica fiber and ceramic fiber, and removing slag balls and impurities at the bottom to obtain high silica short fiber powder and ceramic short fiber powder with the length of 30-300 mu m;
step 3): adding 5-10 wt.% of high-silica short fiber powder and ceramic short fiber powder, and 0.2-1 wt.% of inorganic binder into deionized water to prepare two independent slurries, and mixing the two slurries under a high-speed stirring state to prepare uniform high-silica short fiber slurry and ceramic short fiber slurry;
step 4): firstly, a woven high silica fiber grid cylinder is utilized, then an inner core die is set in the grid cylinder, ceramic short fiber slurry is sprayed on the outer layer of the grid cylinder by adopting a spraying method, and the ceramic short fiber slurry is sprayed in an up-down multilayer reciprocating manner until a ceramic short fiber coating of 0.1-0.3cm is formed on the outer layer of a fiber frame;
step 5): spraying high silica short fiber slurry on the inner side of the fiber frame by using an inner spray pipe, wherein the spraying mode adopts an up-down multilayer reciprocating spraying mode until a high silica short fiber coating of 0.1-0.3cm is formed on the inner layer of the grid cylinder, so that a fabric enhanced high silica fiber filter tube prototype with an inner coating and an outer coating is obtained;
step 6): fixing the fabric reinforced high silica fiber filter tube blank with the inner and outer coatings by utilizing an outer layer mold and an inner core mold, respectively injecting corresponding slurry into the inner layer and the outer layer according to the calculation of the design thickness, carrying out suction filtration molding, removing moisture, and demoulding and drying the wet blank subjected to suction filtration molding to obtain the fabric reinforced high silica fiber filter tube.
Preferably, the slurry injected into the inner layer in the step 6) is a slurry containing a denitration catalyst.
The invention uses high-silica fiber which can be weaved and has high temperature resistance to weave and reinforce the grid cloth, thereby greatly improving the mechanical strength of the fiber filter tube and reducing the fracture of the fiber filter tube. In addition, the fiber structures on the inner side and the outer side are respectively and mainly used for desulfurization, denitrification and dust removal, and the device has the characteristics of high efficiency, good temperature resistance, good repeatability, long service life and the like.
The fiber filter tube is reinforced by adopting a fiber grid cylinder woven by high-temperature-resistant continuous fibers, and high silica fibers with porous structures on the inner layer are used as a main body for attaching the desulfurization and denitrification catalyst, so that the fiber filter tube has a better attachment effect with a conventional ceramic fiber filter tube project; according to the sequence of dust removal, desulfurization and denitration, the two structures of inside and outside are adopted, layered dust removal, desulfurization and denitration are realized, the service efficiency is higher, the service life is longer, and the ceramic fiber filter tube is completely different from other ceramic fiber filter tubes.
Compared with the prior art, the invention has the beneficial effects that:
(1) the cylindrical grid structure for reinforcement is prepared from continuous high silica fibers, and the high silica has good temperature resistance, so that the strength of a long fiber filter cylinder can be obviously improved, and the breakage possibility of the filter cylinder is greatly reduced;
(2) the invention develops a stepped structure design, and particularly, the outer surface of the filter cylinder is mainly used for influencing the effect of the catalyst according to the principle that dust is removed before desulfurization and denitrification, so that the cost is reduced by adopting ceramic fiber cotton on the outer layer part, and the high-silica short fiber is adopted on the inner side of the filter cylinder, so that the catalyst for desulfurization and denitrification can be effectively attached, and the efficiency of the dust removal and the denitrification is improved through a layered structure.
(3) After the fiber grids are adopted for reinforcement, the product pre-adhesion is realized by spraying, the effective transition of the inner layer and the outer layer can be improved, and the natural transition of the two-layer structure is realized.
(4) The invention adopts high silica continuous fiber, is high temperature resistant and can weave a grid structure, and adopts high silica short fiber at the inner side, and the surface microporous structure of the high silica fiber after acid treatment is favorable for adsorbing the catalyst, thereby improving the efficiency and the service life of the catalyst.
Drawings
FIG. 1 is a front view of a fabric reinforced high silica fiber filter tube according to the present invention; wherein, 1 is a high silica fiber grid cylinder, and 2 is an inner-layer high silica short fiber; 3 is ceramic short fiber;
FIG. 2 is a schematic view of a high silica fiber grid cylinder;
fig. 3 is a cylindrical grid picture of high silica fiber provided by the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
The embodiment provides a preparation method of a fabric-reinforced high silica fiber filter tube, which comprises the following specific steps:
step 1): respectively chopping high silica fiber (Shaanxi Huate glass fiber group Co., Ltd., 9 microns) and ceramic fiber (Zhejiang Hongda crystal fiber Co., Ltd., aluminum silicate fiber), and ball-milling in a ball-milling pot for 2-6 h;
step 2): filtering the ground high silica fiber and ceramic fiber, and removing slag balls and impurities at the bottom to obtain high silica short fiber powder and ceramic short fiber powder with the length of 30-300 mu m;
step 3): adding 6 wt.% of high-silica short fiber powder and 5 wt.% of silica sol into deionized water, and mixing under a high-speed stirring state to prepare uniform high-silica short fiber slurry; adding 8 wt.% of ceramic short fiber powder and 0.5 wt.% of silica sol into deionized water, and mixing under a high-speed stirring state to prepare uniform ceramic short fiber slurry;
step 4): firstly, a knitted high silica fiber grid cylinder is utilized, the grid specification is 5mm x 5mm, and the surface weight of grid cloth is 120g/m2Then, backing the inner core die, spraying ceramic short fiber slurry on the outer layer of the grid cylinder by adopting a spraying method, and spraying up and down a plurality of layers to and fro until a ceramic short fiber coating of 0.3cm is formed on the outer layer of the fiber frame;
step 5): spraying high silica short fiber slurry on the inner side of the fiber frame by using an inner spray pipe, wherein the spraying mode adopts an up-down multilayer reciprocating spraying mode until a 0.3cm high silica short fiber coating is formed on the inner layer of the grid cylinder, so that a fabric enhanced high silica fiber filter pipe prototype with an inner coating and an outer coating is obtained;
step 6): fixing a fabric-reinforced high silica fiber filter tube prototype with an inner coating and an outer coating by using an outer layer mold and an inner core mold, putting a vanadium-titanium denitration catalyst solution (Aokay environmental protection new material Co., Ltd., Yixing city) with the mass fraction of 3% into the filter tube, discharging the vanadium-titanium denitration catalyst solution from the inner layer of the filter tube through the outer layer by suction filtration, and adsorbing the vanadium-titanium denitration catalyst solution into the filter tube; according to the weight ratio of the filter tube, the ratio of the weight of the catalyst to the total weight of the filter tube is 5:100, and after the furnace tube after suction filtration is dried for 5 hours at 80 ℃, the fabric reinforced high silica fiber filter tube is obtained, namely the high temperature dust removal filter tube.
The prepared high-temperature dust removal filter tube is practically used in tail gas of a power plant, and the denitration efficiency is found to be up to 92.48 percent, and the dust removal efficiency is found to be up to 98.65 percent.
Claims (3)
1. A fabric enhanced high silica fiber filter tube is characterized by comprising a grid cylinder formed by weaving high silica fibers with high temperature resistance into a grid structure, wherein the inner layer of the grid cylinder is a high silica short fiber coating, and the outer layer of the grid cylinder is a ceramic short fiber coating; the preparation method of the fabric reinforced high silica fiber filter tube comprises the following steps:
step 1): respectively chopping high silica fibers and ceramic fibers, and then ball-milling in a ball-milling tank for 2-6 h;
step 2): filtering the ground high silica fiber and ceramic fiber, and removing slag balls and impurities at the bottom to obtain high silica short fiber powder and ceramic short fiber powder with the length of 30-300 mu m;
step 3): respectively adding 5-10 wt.% of high-silica short fiber powder and ceramic short fiber powder, and 0.2-1 wt.% of inorganic binder into deionized water to prepare two independent slurries, and mixing the two slurries under a high-speed stirring state to prepare uniform high-silica short fiber slurry and ceramic short fiber slurry;
step 4): firstly, a woven high silica fiber grid cylinder is utilized, then an inner core die is set in the grid cylinder, ceramic short fiber slurry is sprayed on the outer layer of the grid cylinder by adopting a spraying method, and the ceramic short fiber slurry is sprayed in an up-down multilayer reciprocating manner until a ceramic short fiber coating of 0.1-0.3cm is formed on the outer layer of a fiber frame;
step 5): spraying high silica short fiber slurry on the inner side of the fiber frame by using an inner spray pipe, wherein the spraying mode adopts an up-down multilayer reciprocating spraying mode until a high silica short fiber coating of 0.1-0.3cm is formed on the inner layer of the grid cylinder, so that a fabric enhanced high silica fiber filter tube prototype with an inner coating and an outer coating is obtained;
step 6): fixing the fabric reinforced high silica fiber filter tube blank with the inner and outer coatings by utilizing an outer layer mold and an inner core mold, respectively injecting corresponding slurry into the inner layer and the outer layer according to the calculation of the design thickness, carrying out suction filtration molding, removing moisture, and demoulding and drying the wet blank subjected to suction filtration molding to obtain the fabric reinforced high silica fiber filter tube.
2. The fabric-reinforced high silica fiber filter tube of claim 1, wherein the coating of high silica short fibers has a desulfurization and denitrification catalyst attached thereto.
3. The fabric-reinforced high silica fiber filter tube of claim 1, wherein the slurry injected into the inner layer in step 6) is a slurry containing a denitration catalyst.
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| CN113877415A (en) * | 2021-10-27 | 2022-01-04 | 盐城工学院 | Porous ceramic filter tube desulfurization dust removal denitration integrated device |
| CN114632623A (en) * | 2022-03-17 | 2022-06-17 | 中国电建集团成都勘测设计研究院有限公司 | Electric filtering integrated tail flue gas purification device |
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| CN204051288U (en) * | 2014-08-30 | 2014-12-31 | 安徽省利特环保技术有限公司 | A kind of waste incineration desulfurization filter cylinder |
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| CN109876656A (en) * | 2019-03-28 | 2019-06-14 | 山东鑫澳节能环保科技有限公司 | Straight barrel type cartridge end sealing device, dedusting denitrification apparatus and its assembly method |
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