Modified functional filter material having denitration activity, preparation method and regeneration method

Abstract

The present invention relates to the technical field of industrial denitration. Disclosed are a modified functional filter material having denitration activity, a preparation method and a regeneration method. The filter material is loaded with a vanadium-titanium-based SCR denitration catalyst; the filter material uses a woven material as warp and weft and is prepared by means of weaving on a weaving machine; the woven material comprises at least one of ceramic fiber yarn, aluminosilicate fiber or quartz fiber yarn; the filter material is in the form of a filter bag, wherein two filter bags are installed in a dust collector with one filter bag nested in the other filter bag; the vanadium-titanium-based SCR denitration catalyst is a vanadium-titanium nanoparticle catalyst; and components of the vanadium-titanium-based SCR denitration catalyst comprise titanium dioxide and vanadium pentoxide. The modified functional filter material having SCR denitration activity of the present invention is applicable to a wide range of operating conditions, and can implement both dust removal and denitration of flue gas without the need to modify existing production process equipment or operating conditions, thus avoiding large equipment modification investment.

Description

Modified functional filter material with denitrification activity, preparation method and regeneration method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 1, 2023, with application number 2023116366426 and invention name “A modified functional filter material with denitrification activity, preparation method and regeneration method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of industrial denitration, and in particular to a modified functional filter material with denitration activity, a preparation method and a regeneration method. Background Art

[0003] Selective catalytic reduction (SCR) is a technology that controls nitrogen oxides (NO x ) emissions, and is widely used in industrial flue gas denitrification from thermal power plants, steel mills, waste incineration plants, coking plants, and glass kilns. This technology uses NH3 produced from urea, aqueous ammonia, or liquid ammonia as a reducing agent. Its core is an SCR denitrification catalyst with excellent catalytic activity, high selectivity, and stable operation. SCR vanadium-titanium catalysts are relatively mature and widely used in industries such as power, steel, and glass. However, their application range is narrow and the required conditions are stringent. They also present issues such as susceptibility to poisoning, short lifespan, and poor operating suitability.

[0004] The SCR catalyst molding process is key to its application and industrial promotion. Traditional catalyst molding technologies, such as honeycomb, plate, and corrugated SCR catalyst molding processes, have achieved some success, but they require modifications to flue gas ducts, resulting in production halts and significant engineering effort, large floor space requirements, and high costs.

[0005] In response to the shortcomings of traditional catalyst molding technology, Topsoe invented a catalyst filter material made by impregnating vanadium titanium catalyst on a polytetrafluoroethylene (PTFE) needle felt substrate. This catalyst filter material has the functions of denitrification and filtration. The catalyst filter material is made into a filter bag form and can be directly installed in the existing dust collector. It only requires the installation of an ammonia injection device and other modifications on the front-end pipeline of the dust collector to achieve the denitrification requirements of the flue gas on the basis of the existing dust collector. This technology requires very little modification to the dust removal system and does not occupy additional site space. The company does not need to stop work for a long time for transformation, saving transformation costs and avoiding shutdown losses.

[0006] The disadvantage of catalyst filter bags made of vanadium-titanium catalyst impregnated polytetrafluoroethylene (PTFE) needle felt substrate is that due to the unstable flue gas temperature, SO3, NH3 and water vapor in the flue gas will react to form ammonium bisulfate. Ammonium bisulfate is deposited on the surface of the vanadium-titanium denitrification catalyst due to capillary condensation under low temperature conditions, causing poisoning and loss of catalyst activity. The heat-resistant temperature of PTFE material is less than 280°C. After the catalyst filter bag fails, it cannot be regenerated, and the company has to bear huge property losses. In an actual application case, more than 2,000 catalyst filter bags were installed in the lime kiln dust collector of a steel plant. During the inspection and maintenance process in 2021, due to improper operation, ammonium bisulfate was formed in the flue gas. This batch of catalyst filter bags was completely poisoned and failed, causing great losses to the company.

[0007] Currently, no effective solutions have been proposed for the problems in related technologies.

[0008] Summary of the Invention

[0009] In response to the problems in the related art, the present invention proposes a modified functional filter material with denitrification activity, a preparation method and a regeneration method to overcome the above technical problems existing in the existing related art.

[0010] To this end, the specific technical solutions adopted in the present invention are as follows:

[0011] According to one aspect of the present invention, a modified functional filter material with denitrification activity is provided, wherein the filter material is loaded with a vanadium-titanium SCR denitrification catalyst and is woven using woven materials as warp and weft and woven on a loom.

[0012] Furthermore, the braided material includes at least one of ceramic fiber yarn, aluminum silicate fiber or quartz fiber yarn.

[0013] Ceramic fiber yarns are heat-resistant and have fiber diameters ranging from 1.0 to 4.5 μm. Ceramic fibers are carded into ceramic fiber slivers on a carding machine. These slivers are then twisted together on a twisting machine to form ceramic fiber yarns. The denier (Tex) of these yarns ranges from 525, 630, 780, 830, 1000, and 2250 Tex. Tex represents the weight in grams of 1000 meters of yarn at a specified moisture regain. The higher the Tex, the thicker the yarn. Tex is a metric unit. Ceramic fiber woven fabrics have a maximum temperature resistance of 1000°C, resolving the issue of catalyst denitrification filter media based on chemical fiber needle-punched felt or woven fabrics being unable to be thermally regenerated after poisoning and failure, thus offering significant application value.

[0014] Furthermore, the filter material is in the form of a filter bag and is installed in the dust collector by means of two layers of filter bags being nested inside and outside.

[0015] Furthermore, the vanadium-titanium-based SCR denitration catalyst is a nano-sized particle vanadium-titanium catalyst, and the components of the vanadium-titanium-based SCR denitration catalyst include titanium dioxide and vanadium pentoxide.

[0016] It should be noted that titanium dioxide, as the main carrier of the catalyst, provides the structural basis of the catalyst. It has high thermal stability and good surface properties, and can effectively disperse the active components, thereby improving the catalytic efficiency.

[0017] Vanadium pentoxide is the active component of the catalyst. It is a key component in the SCR reaction and is responsible for catalyzing the x A chemical reaction with a reducing agent (usually ammonia or urea) converts NO x Converted into nitrogen and water, reducing pollutant emissions.

[0018] According to another aspect of the present invention, a method for preparing a modified functional filter material having denitrification activity is provided, the preparation method comprising the following steps:

[0019] S1, warping, beating and weaving the woven material to obtain warp and weft filter material;

[0020] S2. Loading the obtained warp and weft filter material with a vanadium-titanium denitration catalyst.

[0021] Furthermore, the warping, beating-up and weaving of the woven material to obtain the warp and weft filter material comprises the following steps:

[0022] Stainless steel wire is used to plied and twisted with braided materials to obtain yarn;

[0023] It should be noted that a plying machine is used to tightly combine the stainless steel wire and the braided material to form a single composite yarn, and a twisting machine is used to twist the ply-ply yarn to increase the tightness and strength of the yarn.

[0024] The yarn is used as warp and weft, and the weaving beam is made by the warping process and installed on the loom to weave the fabric, which is used as warp and weft filter material.

[0025] In the present invention, the diameter of the stainless steel wire is preferably 0.1 to 0.2 mm.

[0026] It should be noted that the yarns are arranged according to the desired density and sequence to form a warp beam. During the warping process, the yarn tension is maintained uniformly to prevent breakage or loosening. The prepared warp beam is then installed on the loom, ensuring that each yarn passes correctly through the heald frames and reeds. Finally, the loom is started, and the warp and weft threads are interwoven to form the fabric.

[0027] It should be noted that the high temperature resistant ceramic fiber filter material has a gram weight of 900-2000g / m 2 The warp and weft structure of the fabric.

[0028] Furthermore, the texture of the fabric includes at least one of plain weave, twill weave, double twill weave or satin weave.

[0029] Furthermore, the method of loading the obtained warp and weft filter material with a vanadium-titanium denitration catalyst comprises the following steps:

[0030] The obtained Jingwei filter material is immersed in an aqueous solution of a vanadium-titanium denitration catalyst;

[0031] The Jingwei filter material is dried at a preset drying temperature, and the vanadium-titanium denitrification catalyst is loaded on the Jingwei filter material.

[0032] For example, the technical parameters of high temperature resistant ceramic fiber filter media include:

[0033] Filter material structure: double twill, ensuring the fabric has good mechanical properties and filtration performance;

[0034] Filter material composition: warp and weft, both warp and weft are ceramic fiber yarns reinforced with stainless steel wire;

[0035] Weight: 1600±50g / m 2 ;

[0036] Thickness: 3.5-4.0mm;

[0037] Warp breaking strength: >1000N / 5*20cm;

[0038] Weft breaking strength: >600N / 5*20cm;

[0039] Breathability: 700L / m 2 / second@200Pa±20%.

[0040] According to another aspect of the present invention, a method for regenerating a modified functional filter material having denitrification activity is provided, the regeneration method comprising the following steps:

[0041] SⅠ. Place the filter material that has lost its denitrification activity in a pre-set heating device;

[0042] SⅡ, heat to above 390℃ at a heating rate of 3℃ / min and maintain the temperature for several hours;

[0043] SⅢ, decomposing the ammonium bisulfate deposited on the surface of the vanadium-titanium denitrification catalyst to obtain a filter material with restored denitrification activity.

[0044] It should be noted that during the use of filter bags made of modified functional filter materials, SO3, NH3 and water vapor in the flue gas will react to generate ammonium bisulfate. Under low temperature conditions, ammonium bisulfate is deposited on the surface of the vanadium-titanium denitrification catalyst due to capillary condensation, causing poisoning and loss of activity of the catalyst. By placing the filter bags that have lost their denitrification activity in a heating device, heating them to above 390°C at a heating rate of 3°C / minute and maintaining the temperature for several hours, the ammonium bisulfate can be decomposed and a filter material with restored denitrification activity can be obtained.

[0045] Among them, the ammonium bisulfate decomposition process of the vanadium-titanium denitrification catalyst is as follows: ammonium bisulfate thermally decomposes at 246°C to release NH3, and releases SO2 at 390°C. The catalyst can restore its denitrification activity through thermal regeneration.

[0046] The beneficial effects of the present invention are:

[0047] 1. The modified functional filter material with SCR denitrification activity of the present invention is applicable to a wide range of working conditions. It does not require changing the original production process equipment or working conditions to achieve both dust removal and denitrification of flue gas, thus avoiding large amounts of equipment modification investment.

[0048] 2. The modified functional filter material with SCR denitrification activity of the present invention adopts a three-dimensional structure woven with warp and weft yarns, which can load more catalysts, increase the contact area and contact time between flue gas and catalyst, greatly improve the catalytic efficiency, and the denitrification rate is greater than 90%.

[0049] 3. Compared with traditional chemical fiber needle-punched felt or woven glass fiber filter materials, the modified functional filter materials of the present invention, such as ceramic fiber fabrics, can be used in high-temperature working environments of 300-400°C without taking cooling measures, thus avoiding energy loss. For example, in working conditions such as glass kilns and waste incinerators, filter bags made of modified functional filter materials such as ceramic fiber fabrics can be directly installed.

[0050] 4. The modified functional filter material with SCR denitrification activity of the present invention can be thermally regenerated. x During the denitrification process, SO3, NH3 and water vapor in the flue gas react at low temperatures to generate ammonium bisulfate, which causes the vanadium-titanium denitrification catalyst to be poisoned and fail. The filter bag is heated to above 390°C and maintained at this temperature for several hours. The ammonium bisulfate decomposes into NH3, SO2, H2O and O2. The vanadium-titanium denitrification catalyst can restore its denitrification activity, and the denitrification activity can reach more than 80% of the initial performance of the new catalyst, which can minimize losses and avoid waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0052] FIG1 is a flow chart of a method for preparing a modified functional filter material having denitrification activity according to an embodiment of the present invention;

[0053] FIG2 is a flow chart of a method for regenerating a modified functional filter material having denitrification activity according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0055] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0056] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0057] As used herein, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Furthermore, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0058] In this document, when referring to a range, if the unit is followed only by the right endpoint, it means that the units for both the left and right endpoints are the same. For example, 5-15°C / min means that the units for both the left endpoint "5" and the right endpoint "15" are °C / min.

[0059] Only certain numerical ranges are specifically disclosed herein. However, any lower limit may be combined with any upper limit to form an unspecified range; and any lower limit may be combined with other lower limits to form an unspecified range, and similarly, any upper limit may be combined with any other upper limit to form an unspecified range. In addition, each individually disclosed point or single value may itself serve as a lower limit or upper limit and be combined with any other point or single value, or with other lower limits or upper limits, to form an unspecified range.

[0060] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0061] According to an embodiment of the present invention, as shown in FIG1-2 , a modified functional filter material having denitrification activity, a preparation method, and a regeneration method are provided.

[0062] The present invention is now further described with reference to the accompanying drawings and specific embodiments. According to one embodiment of the present invention, a modified functional filter material with denitrification activity is provided, wherein the filter material is loaded with a vanadium-titanium SCR denitrification catalyst, and the filter material is made by weaving a woven material as the warp and weft and by a loom.

[0063] Specifically, the braided material includes at least one of ceramic fiber yarn, aluminum silicate fiber or quartz fiber yarn.

[0064] Ceramic fiber yarns are heat-resistant and have fiber diameters ranging from 1.0 to 4.5 μm. Ceramic fibers are carded into ceramic fiber slivers on a carding machine. These slivers are then twisted together on a twisting machine to form ceramic fiber yarns. The denier (Tex) of these yarns ranges from 525Tex, 630Tex, 780Tex, 830Tex, 1000Tex, and 2250Tex. Tex represents the weight in grams of 1000 meters of yarn at a specified moisture regain. The higher the Tex, the thicker the yarn. Tex is a metric unit. Ceramic fiber woven fabrics have a maximum temperature resistance of 1000°C, resolving the issue of catalyst denitrification filter media based on chemical fiber needle-punched felt or woven fabrics being unable to be thermally regenerated after poisoning and failure, thus offering significant application value.

[0065] Specifically, the filter material is in the form of a filter bag and is installed in the dust collector by means of two layers of filter bags, inner and outer set, and has the functions of both filtering and denitrification.

[0066] Specifically, the vanadium-titanium-based SCR denitration catalyst is a nano-sized particle vanadium-titanium catalyst, and the components of the vanadium-titanium-based SCR denitration catalyst include titanium dioxide and vanadium pentoxide.

[0067] It should be noted that titanium dioxide, as the main carrier of the catalyst, provides the structural basis of the catalyst. It has high thermal stability and good surface properties, and can effectively disperse the active components, thereby improving the catalytic efficiency.

[0068] Vanadium pentoxide is the active component of the catalyst. It is a key component in the SCR reaction and is responsible for catalyzing the x A chemical reaction with a reducing agent (usually ammonia or urea) converts NO x Converted into nitrogen and water, reducing pollutant emissions.

[0069] In the present invention, the vanadium-titanium SCR denitration catalyst can be a vanadium-titanium SCR denitration catalyst in the art, or can be prepared by itself according to conventional preparation methods in the art, which will not be described in detail in the present invention.

[0070] In the present invention, the loading amount of the vanadium-titanium SCR denitration catalyst in the modified functional filter material is preferably 50 to 200 g / m 2 , more preferably 100 to 150 g / m 2 .

[0071] According to another embodiment of the present invention, a method for preparing a modified functional filter material having denitrification activity is provided, the preparation method comprising the following steps:

[0072] S1, warping, beating and weaving the woven material to obtain warp and weft filter material;

[0073] S2. Loading the obtained warp and weft filter material with a vanadium-titanium denitration catalyst.

[0074] Specifically, the warping, beating-up and weaving of the woven material to obtain the warp and weft filter material includes the following steps:

[0075] Using 0.1-0.2 mm stainless steel wire, such as 0.1 mm stainless steel wire, and braiding material, and twisting them together to obtain yarn;

[0076] In the present invention, the braided material is at least one of ceramic fiber yarn, aluminum silicate fiber or quartz fiber yarn; the quantitative ratio of the stainless steel wire to the braided material is preferably 1:(1-2), such as 1:1 or 1:2. In the present invention, the quantitative ratio of the stainless steel wire to the braided material is 1:1, which means that one stainless steel wire and one braided material are used to be ply-plyed and twisted together.

[0077] It should be noted that a plying machine is used to tightly combine the stainless steel wire and the braided material to form a single composite yarn, and a twisting machine is used to twist the ply-ply yarn to increase the tightness and strength of the yarn.

[0078] The preliminary yarn is used as the warp and weft, and the weaving beam is made by the warping process and installed on the loom to weave the fabric, which is used as the warp and weft filter material.

[0079] It should be noted that the yarns are arranged according to the desired density and sequence to form a warp beam. During the warping process, the yarn tension is maintained uniformly to prevent breakage or loosening. The prepared warp beam is then installed on the loom, ensuring that each yarn passes correctly through the heald frames and reeds. Finally, the loom is started, and the warp and weft threads are interwoven to form the fabric.

[0080] It should be noted that the high temperature resistant ceramic fiber filter material, namely the warp and weft filter material, has a gram weight of 900-2000g / m 2 The warp and weft structure of the fabric, the weight of the high temperature resistant ceramic fiber filter material is preferably 1000-1800g / m 2 , more preferably 1500 to 1600 g / m 2 .

[0081] Specifically, the texture of the fabric includes at least one of plain weave, twill weave, double twill weave or satin weave.

[0082] Specifically, the loading of the obtained Jingwei filter material with a vanadium-titanium denitration catalyst comprises the following steps:

[0083] The obtained Jingwei filter material is immersed in an aqueous solution of a vanadium-titanium denitration catalyst;

[0084] The Jingwei filter material is dried at a preset drying temperature, and the vanadium-titanium denitrification catalyst is loaded on the Jingwei filter material.

[0085] In the present invention, the mass concentration of the aqueous solution of the vanadium-titanium denitration catalyst and the impregnation process conditions can be carried out according to the mass concentration of the aqueous solution of the vanadium-titanium denitration catalyst and the impregnation process conditions commonly used in the art, and the present invention will not repeat them here.

[0086] In the present invention, the drying temperature is preferably 200-285° C., more preferably 220-260° C., most preferably 240-250° C.; the drying speed is preferably 2-5 m / min, more preferably 3-4 m / min.

[0087] In a series of products of the present invention, the technical parameters of the modified functional filter material with denitrification activity are as follows:

[0088] Filter material structure: plain weave, ensuring the fabric has good mechanical properties and filtration performance;

[0089] Filter material composition: warp and weft, both warp and weft are ceramic fiber yarns reinforced with stainless steel wire;

[0090] Weight: 1600±50g / m 2 ;

[0091] Thickness: 3.5-4.0mm;

[0092] Warp breaking strength: >1000N / 5*20cm;

[0093] Weft breaking strength: >600N / 5*20cm;

[0094] Air permeability: 700L / m 2 / second@200Pa±20%.

[0095] In another series of products of the present invention, the technical parameters of the modified functional filter material with denitrification activity are as follows:

[0096] Filter material structure: plain weave, ensuring the fabric has good mechanical properties and filtration performance;

[0097] Filter material composition: warp and weft, both warp and weft are ceramic fiber yarns reinforced with stainless steel wire;

[0098] Weight: 1400±70g / m 2 ;

[0099] Thickness: 3.5-3.8mm;

[0100] Warp breaking strength: >1000N / 5*20cm;

[0101] Weft breaking strength: >400N / 5*20cm;

[0102] Air permeability: 700L / m 2 / second@200Pa±20%.

[0103] According to another embodiment of the present invention, a method for regenerating a modified functional filter material having denitrification activity is provided, the regeneration method comprising the following steps:

[0104] SⅠ. Place the filter material that has lost its denitrification activity in a pre-set heating device;

[0105] SⅡ, heat to above 390℃ at a rate of 1-5℃ / min and maintain the temperature for several hours;

[0106] SⅢ, decomposing the ammonium bisulfate deposited on the surface of the vanadium-titanium denitrification catalyst to obtain a filter material with restored denitrification activity.

[0107] In the present invention, the heating rate is preferably 1 to 5°C / min, more preferably 2 to 4°C / min; and the heating temperature is preferably above 390°C.

[0108] It should be noted that during the use of filter bags made of modified functional filter materials, SO3, NH3 and water vapor in the flue gas will react to generate ammonium bisulfate. Under low temperature conditions, ammonium bisulfate is deposited on the surface of the vanadium-titanium denitrification catalyst due to capillary condensation, causing poisoning and loss of activity of the catalyst. By placing the filter bags that have lost their denitrification activity in a heating device, heating them to above 390°C at a heating rate of 3°C / minute and maintaining the temperature for several hours, the ammonium bisulfate can be decomposed and a filter material with restored denitrification activity can be obtained.

[0109] Among them, the ammonium bisulfate decomposition process of the vanadium-titanium denitrification catalyst is as follows: ammonium bisulfate thermally decomposes at 246°C to release NH3, and releases SO2 at 390°C. The catalyst can restore its denitrification activity through thermal regeneration.

[0110] For example, ceramic filter tubes can also be used in high temperature working environments of 300-400℃. Ceramic filter tubes need to be produced by molds, with the maximum size of 150mm diameter × 3000mm length and a filtration area of ​​1.40m 2 The size of the ceramic fiber fabric filter bag can be flexibly cut and sewn according to the working conditions. If the same diameter is adopted, the maximum length of the filter bag can reach 8 meters, and the filter surface fabric is 4.0m 2 , the filtration wind speed is low; the wall thickness of the ceramic filter tube is 10mm, the thickness of the ceramic fiber filter material is 3mm, and the pressure difference of the ceramic fiber filter material filter bag is 1300Pa, which is 40% lower than that of the ceramic filter tube. It has the remarkable characteristics of safe and stable system operation, low resistance, high efficiency and long life, and reduces energy loss and operation and maintenance costs by 50%.

[0111] Example

[0112] Stainless steel wire with a wire diameter of 0.1 mm and ceramic fiber yarn with a diameter of 525 tex are plied and twisted together to obtain yarn;

[0113] The yarn is woven in a plain weave manner to obtain a warp and weft filter material;

[0114] The warp and weft filter materials are immersed in a vanadium-titanium SCR denitration catalyst aqueous solution, and then dried in a drying device at 280° C. at a speed of 2-5 m / min to obtain a modified functional filter material with denitration activity.

[0115] The modified functional filter material with denitrification activity obtained in this example was tested in accordance with GB / T 6719-2009 Technical Requirements for Bag Dust Collectors, T / CAEPI 21-2019 Technical Requirements for Filter Materials for Bag Dust Collectors, and HJ / T 324-2006 Technical Requirements for Environmental Protection Products for Filter Materials for Bag Dust Collectors. The parameters of the modified functional filter material with denitrification activity prepared in this example are as follows:

[0116] Weight: 1075g / m 2 ;

[0117] Thickness: 2.84mm;

[0118] Warp breaking strength: 1400N / 5*20cm;

[0119] Weft breaking strength: 905N / 5*20cm;

[0120] Radial elongation at break: 15.8%;

[0121] Weft elongation at break: 6.2%;

[0122] Air permeability: 14.62m 3 / m 2 ·min.

[0123] In summary, with the help of the above technical solutions of the present invention, the modified functional filter material with SCR denitrification activity of the present invention is applicable to a wide range of working conditions, and can achieve the two requirements of dust removal and denitrification of flue gas without changing the original production process equipment or working conditions, thus avoiding large amounts of equipment transformation investment; the modified functional filter material with SCR denitrification activity of the present invention adopts a three-dimensional structure woven with warp and weft yarns, which can load more catalysts, increase the contact area and contact time between flue gas and catalyst, greatly improve the catalytic efficiency, and the denitrification rate is greater than 90%; compared with traditional chemical fiber needle-punched felt or woven glass fiber filter materials, the modified functional filter material of the present invention, such as ceramic fiber fabric, can be used in high temperature working conditions of 300-400°C, without taking cooling measures, thus avoiding energy loss, such as in glass kilns, waste incinerators and other application conditions, and filter bags made of modified functional filter material such as ceramic fiber fabric can be directly installed; the modified functional filter material with SCR denitrification activity of the present invention can be thermally regenerated, and in NO x During the denitrification process, SO3, NH3 and water vapor in the flue gas react at low temperatures to generate ammonium bisulfate, which causes the vanadium-titanium denitrification catalyst to be poisoned and fail. The filter bag is heated to above 390°C and maintained at this temperature for several hours. The ammonium bisulfate decomposes into NH3, SO2, H2O and O2. The vanadium-titanium denitrification catalyst can restore its denitrification activity, and the denitrification activity can reach more than 80% of the initial performance of the new catalyst, which can minimize losses and avoid waste of resources.

[0124] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A modified functional filter material with denitrification activity, characterized in that: The filter material is loaded with a vanadium-titanium SCR denitration catalyst, and the filter material is made by using a woven material as a warp and a weft and weaving through a loom.

2. The modified functional filter material with denitrification activity according to claim 1, characterized in that: The braided material includes at least one of ceramic fiber yarn, aluminum silicate fiber or quartz fiber yarn.

3. The modified functional filter material with denitrification activity according to claim 1, characterized in that: The filter material is in the form of a filter bag and is installed in the dust collector by means of two layers of filter bags being set inside and outside.

4. The modified functional filter material with denitrification activity according to claim 1, characterized in that: The vanadium-titanium series SCR denitration catalyst is a vanadium-titanium catalyst of nano-scale particles, and the components of the vanadium-titanium series SCR denitration catalyst include titanium dioxide and vanadium pentoxide.

5. A method for preparing a modified functional filter material with denitrification activity, for realizing the preparation of the modified functional filter material with denitrification activity according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: The woven material is subjected to warping, beating and weaving treatment to obtain warp and weft filter material; The obtained Jingwei filter material is loaded with a vanadium-titanium denitration catalyst.

6. The method for preparing a modified functional filter material with denitrification activity according to claim 5, characterized in that: The warping, beating and weaving of the woven material to obtain the warp and weft filter material comprises the following steps: 0.1-0.2 mm stainless steel wire is used to fold and twist the braided material together to obtain yarn; The yarn is used as warp and weft, and the weaving beam is made by the warping process and installed on the loom to weave the fabric, which is used as warp and weft filter material.

7. The method for preparing a modified functional filter material with denitrification activity according to claim 6, characterized in that: The texture of the fabric includes at least one of plain weave, twill weave, double twill weave or satin weave.

8. The method for preparing a modified functional filter material with denitrification activity according to claim 5, characterized in that: The method of loading the obtained Jingwei filter material with a vanadium-titanium denitration catalyst comprises the following steps: The obtained Jingwei filter material is immersed in an aqueous solution of a vanadium-titanium denitration catalyst; The Jingwei filter material is dried at a preset drying temperature, and the vanadium-titanium denitrification catalyst is loaded on the Jingwei filter material.

9. A method for regenerating a modified functional filter material having denitration activity, for realizing the regeneration of the modified functional filter material having denitration activity according to any one of claims 1 to 4, characterized in that: The regeneration method comprises the following steps: Place the filter material that has lost its denitrification activity in a preset heating device; Heating to above 390°C at a rate of 1-5°C / min and maintaining the temperature for several hours; The ammonium bisulfate deposited on the surface of the vanadium-titanium denitrification catalyst is decomposed to obtain a filter material with restored denitrification activity.

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