CN110252031B - Nuclear grade water filter element filter material and preparation method thereof - Google Patents
Nuclear grade water filter element filter material and preparation method thereof Download PDFInfo
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- CN110252031B CN110252031B CN201910557935.2A CN201910557935A CN110252031B CN 110252031 B CN110252031 B CN 110252031B CN 201910557935 A CN201910557935 A CN 201910557935A CN 110252031 B CN110252031 B CN 110252031B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2003—Glass or glassy material
- B01D39/2017—Glass or glassy material the material being filamentary or fibrous
- B01D39/2024—Glass or glassy material the material being filamentary or fibrous otherwise bonded, e.g. by resins
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Abstract
The invention discloses a nuclear-grade water filter element filter material and a preparation method thereof, wherein the nuclear-grade water filter element filter material comprises a base material and non-woven fabrics, wherein the base material is made of micro glass fiber cotton with the alkali metal content of more than 9 percent; the base material and the non-woven fabric are soaked in water-based resin, sucked under negative pressure and dried and bonded together. The filtering material prepared by the method has the filtering precision of less than or equal to 1 mu m and the air permeability of more than or equal to 36L/m under the pressure of 200Pa2Sec, tensile strength is more than or equal to 0.2 kN/m; has stronger water flow impact resistance, the strength retention rate of the solution treated by 50g/L (5%) of sodium hydroxide at 23 +/-2 ℃ for 7 days can reach more than 60%, and the water quality requirement of a primary loop of a nuclear power station is met.
Description
Technical Field
The invention relates to the technical field of nuclear power station water filtration, in particular to a nuclear grade water filter element filter material and a preparation method thereof.
Background
The safety of a primary loop, which is used as the main artery in a pressurized water reactor nuclear power plant, is particularly important in the whole nuclear power plant. In a loop system, corrosion products, suspended solid particles and various ions exist in water in a colloid form, the particle size of the corrosion products is mostly more than 5 mu m, and the corrosion products are deposited on the heat transfer surface of the reactor loop, so that the heat transfer efficiency is reduced. When the accumulation is excessive, the local flow passage of the reactor core can be blocked or the heat exchange surface can be overheated, and serious accidents can be caused. In addition, the radioactivity in the deposited activated corrosion products causes much trouble to the maintenance work when the reactor is shut down for maintenance. Further, Cl-、F-、SO4 2-、SiO2、Ca2+、Mg2 +、Al3+The plasma deposition should also be controlled within the allowable range. This is because of Cl-And F-Stress corrosion cracking and SO of stainless steel at the pressure boundary of a loop4 2-Cracking the steam generator on a loop side, thereby destroying the integrity of a loop pressure boundary barrier and causing radioactive leakage; SiO 22、Ca2+、Mg2+、Al3+Etc. which have a negative temperature coefficient of solubility, will be the component having the highest temperature in the reactor coolant system, i.e., the element rodThe surface preferential deposition may densify the deposits on the surface of the element rod, affecting the reactivity of the core. Therefore, the method has important significance in ensuring the stable operation of the nuclear power station and improving the filtering precision of the filter so as to avoid excessive accumulation of redundant substances in a loop. Meanwhile, because the water flow velocity of the nuclear power station is high, the improvement of the strength retention rate of the filter under the impact of the high-flow-velocity water flow is very important.
The existing filter paper is mostly made of alkali-free glass fibers, and is attached to a non-woven fabric through a hot pressing or cold pressing method so as to improve strength, but the water quality of a nuclear power station is alkaline, the alkali-free glass fibers can suffer from serious erosion, meanwhile, the cold pressing and hot pressing processes can lead to uneven distribution of bonding glue in the structure, even lead to hole plugging, and cause negative effects on the air permeability and the filtering precision of the filter material. With the improvement of nuclear power on the requirement of primary loop water quality, the filtration precision of the filter is gradually improved from dozens of micrometers to less than 1 micrometer, and how to improve the strength retention rate of the filter material under high water flow while maintaining the filtration precision is always the key and difficult point of research of technicians in the field.
Disclosure of Invention
In order to solve the technical problems of low filtering precision and poor water flow impact resistance of the filter element filter material of the conventional nuclear-grade water filter, the invention provides the filter element filter material of the nuclear-grade water filter and the preparation method thereof, the filtering precision of the filter element filter prepared by the method is less than or equal to 1 mu m, and the air permeability is more than or equal to 36L/m under the pressure of 200Pa2Sec, tensile strength is more than or equal to 0.2 kN/m; has stronger water flow impact resistance, the strength retention rate of the solution treated by 50g/L (5%) of sodium hydroxide at 23 +/-2 ℃ for 7 days can reach more than 60%, and the water quality requirement of a primary loop of a nuclear power station is met.
The technical scheme adopted by the invention is as follows:
a nuclear grade water filter element filter material comprises a base material made of micro glass fiber cotton with alkali metal content more than 9 percent and non-woven fabrics attached to the upper surface and the lower surface of the base material; the base material and the non-woven fabric are soaked in water-based resin, sucked under negative pressure and dried and bonded together.
In order to further improve the tensile strength of the filter medium, the aqueous resin is preferably at least one of an aqueous polyurethane resin, an aqueous epoxy resin, an aqueous acrylate resin, and an aqueous phenol resin.
In order to further improve the filtering precision of the filter material, the base material is preferably formed by mixing micro glass fiber cotton with at least two kinds of beating degrees and glass fiber chopped strands with the length of 5-10 mm according to the mass percentage (90-100): (0-10) mixing, and then manufacturing by wet papermaking; the beating degree is selected within the SR range of 34-60 degrees.
In order to further improve the water impact resistance of the filter, the micro glass fiber cotton preferably comprises the following components: SiO 2255.0～67.0％，Al2O34.0～7.0％，CaO1.0～5.0％，MgO0～4.0％，B2O34.0～14.0％，Na2O8.0～17.0％，K21.0 to 4.0% of O, 0.1 to 6.0% of BaO0, and 0.1 to 5.0% of ZnO0.
In order to further improve the tensile strength of the filter material, the mass content of the water-based resin is preferably 8-20 wt% of the base material.
In order to further improve the filtration accuracy of the filter medium, the basis weight of the base material is preferably 10 to 60g/m2The aperture is 0.05-50 μm.
In order to further improve the water impact resistance of the filter material, the non-woven fabric is preferably polyethylene terephthalate non-woven fabric, and the gram weight of the non-woven fabric is 10-20 g/m2。
The preparation method of the nuclear grade water filter element filter material comprises the following steps:
s1, mixing microfiber glass wool and short glass fiber shreds according to a set proportion, adding water and inorganic acid, and uniformly dispersing to obtain slurry, wherein the concentration of the slurry is 0.5-5 wt%, and the pH value is 2.0-5.0;
s2, sequentially carrying out deslagging, diluting, forming and dehydrating on the slurry obtained in the step S1 to form wet paper pages with uniform thickness, and then drying to form a base material, wherein the diluted concentration is 0.1-1% wt;
s3, compounding non-woven fabrics on the upper surface and the lower surface by taking the base material obtained in the step S2 as an intermediate layer to form a composite filter material with a three-layer structure;
s4, soaking the composite filter material obtained in the step S3 in water-based resin, removing redundant water-based resin in a negative pressure suction mode, and drying to obtain the nuclear-grade water filter element filter material.
Preferably, the dipping speed is controlled to be 0.1-20 m/min.
Preferably, a vacuum suction box is adopted to perform negative pressure suction on the impregnated composite filter material to remove redundant aqueous resin.
The invention has the beneficial effects that:
1. the water-based resin is uniformly distributed in a non-woven fabric-base material-non-woven fabric structure in a dipping and negative pressure suction mode to be integrally formed, the water-based resin provides protection for the filter material base material and simultaneously bonds the non-woven fabric and the base material together, and the prepared filter material has high tensile strength, strong water flow impact resistance and Cl resistance-、F-、SO4 2-、SiO2、Ca2+、Mg2+、Al3+And (4) separating out plasma.
2. The base material is made of microfiber glass wool with high alkali metal content, wherein the microfiber glass wool is fine, short and flocculent fibers which are made of heated silicate (glass) solution and blown by centrifugal force generated by a centrifugal machine or high-speed airflow generated by combustion of natural gas and the like, and the average fiber diameter of the microfiber glass wool is not more than 3.5 microns. Besides the characteristics of common glass fibers such as insulativity, heat resistance, corrosion resistance, high mechanical strength and the like, the microfiber glass wool has small diameter and is flocculent, and has special properties of filtering, adsorbing, limiting movement and the like on fine particles, molecules and the like after being further processed into filter paper and core materials. The microfiber glass wool with high alkali metal content is more alkali resistant. More than two kinds of microfiber glass wool with beating degree are compounded with glass fiber chopped strands with certain length, the filtering precision of the prepared filter material is less than or equal to 1 mu m, and the air permeability is more than or equal to 36L/m under the pressure of 200Pa2/sec。
3. The base material formed by wet papermaking has uniform texture structure and high tensile strength, the papermaking process parameters are controlled, the gram weight and the actual pore diameter of the filter material can be controlled, and higher filtering precision and filtering efficiency are obtained.
Detailed Description
In the following examples:
the filtration precision is measured according to EN13443-2-2007 Water regulating apparatus in buildings, mechanical filters, part 2, particle rating of 1 μm to 80 μm (80 μm excluded), Performance, safety and test requirements;
the air permeability test is based on the standard of GB/T458 + 2008 'determination of air permeability of paper and paperboard';
the alkali resistance test is based on the GB/T20102-2006 Standard of alkali resistance test method for glass fiber mesh cloth by sodium hydroxide solution immersion method;
the tensile strength test is based on GB/T12914 + 2008 'determination of tensile strength of paper and paperboard';
the water flow impact resistance is characterized by the strength retention rate of the filter material, wherein the strength retention rate is the percentage of the tensile strength of the filter material after being treated by 50g/L (5%) of sodium hydroxide solution at 23 +/-2 ℃ for 7 days to the tensile strength of the filter material before treatment.
Example 1
The nuclear-grade water filter element filter material comprises a base material and non-woven fabrics attached to the upper surface and the lower surface of the base material, wherein the base material and the non-woven fabrics are soaked in water-based epoxy resin, dried and bonded together after being sucked under negative pressure.
The composition of the substrate is shown in table 1:
table 1 composition table of the substrate of example 1
The chemical composition of the microfiber glass wool is shown in table 2:
table 2 table of chemical composition of microfiber glass wool of example 1
| Composition (I) | Mass ratio (%) |
| SiO2 | 60.5 |
| Al2O3 | 6.0 |
| CaO | 1.7 |
| MgO | 0.3 |
| B2O3 | 10.6 |
| Na2O | 8.6 |
| K2O | 2.9 |
| BaO | 5.0 |
| ZnO | 4.1 |
The preparation method of the nuclear grade water filter element filter material of embodiment 1 comprises the following steps:
s1, mixing microfiber glass wool and short glass fiber shreds according to a set proportion, adding water and sulfuric acid, and uniformly stirring by a high-frequency fluffer to obtain slurry with the concentration of 2 wt% and the pH value of 3;
s2, diluting the obtained pulp after deslagging to be paper pulp suspension with the concentration of 0.25 wt%, forming and dehydrating by a fourdrinier to form wet paper sheets, and drying to form a filter paper base material with the gram weight of 18g/m2；
S3, bonding the upper and lower surfaces of the substrate obtained in the step S2 as an intermediate layer to each other at a thickness of 18g/m2The PET non-woven fabric forms a composite filter material with a three-layer structure;
s4, soaking the composite filter material obtained in the step S3 in 20wt% of water-based epoxy resin at a soaking speed of 10m/min, removing excessive water-based resin through negative pressure suction of a vacuum suction box, and drying to obtain the nuclear-grade water filter element filter material.
The gram weight of the obtained filter material is 58g/m2The actual aperture is 5 μm; the filtration precision is 1 μm and the air permeability is 75L/m2Sec, tensile strength of 0.39kN/m, strength retention of 72%.
Example 2
The nuclear-grade water filter element filter material comprises a base material and non-woven fabrics attached to the upper surface and the lower surface of the base material, wherein the base material and the non-woven fabrics are soaked in water-based styrene-acrylic resin and water-based phenolic resin, dried and bonded together after being sucked under negative pressure.
The composition of the substrate is shown in table 3:
table 3 composition table of the substrate of example 2
The chemical composition of the microfiber glass wool is shown in table 4:
table 4 table of chemical composition of microfiber glass wool of example 2
| Composition (I) | Mass ratio (%) |
| SiO2 | 59.2 |
| Al2O3 | 5.7 |
| CaO | 2.5 |
| MgO | 0.1 |
| B2O3 | 10.9 |
| Na2O | 10.3 |
| K2O | 1.9 |
| BaO | 4.8 |
| ZnO | 3.7 |
The preparation method of the nuclear grade water filter element filter material of embodiment 2 comprises the following steps:
s1, mixing the microfiber glass wool and the glass fiber chopped strands according to a set proportion, adding water and citric acid, and uniformly stirring by a high-frequency fluffer to obtain slurry with the concentration of 0.8 wt% and the pH value of 5;
s2, diluting the obtained pulp after deslagging to be paper pulp suspension with the concentration of 0.15 wt%, forming wet paper sheets after forming and dewatering by a fourdrinier, drying to form a filter paper base material with the gram weight of 16g/m2；
S3, laminating upper and lower surfaces of the substrate obtained in the step S2 as an intermediate layer, wherein the upper and lower surfaces are at a thickness of 15g/m2The PET non-woven fabric forms a composite filter material with a three-layer structure;
s4, soaking the composite filter material obtained in the step S3 in 10 wt% of waterborne styrene-acrylic resin and 1 wt% of waterborne phenolic resin at a soaking rate of 5m/min, removing redundant waterborne resin through negative pressure suction of a vacuum suction box, and drying to obtain the nuclear-grade water filter element filter material.
The gram weight of the obtained filter material is 48g/m2The actual aperture is 2 μm; the filtration precision is 0.7 μm and the air permeability is 64L/m2Sec, tensile strength of 0.28kN/m, strength retention of 78%.
Example 3
The nuclear-grade water filter element filter material comprises a base material and non-woven fabrics attached to the upper surface and the lower surface of the base material, wherein the base material and the non-woven fabrics are soaked in water-based acrylic resin and water-based polyurethane resin, dried and bonded together after being sucked under negative pressure.
The composition of the substrate is shown in table 5:
table 5 composition table of the substrate of example 3
The chemical composition of the microfiber glass wool is shown in table 6:
table 6 table of chemical composition of microfiber glass wool of example 3
| Composition (I) | Mass ratio (%) |
| SiO2 | 58.3 |
| Al2O3 | 4.8 |
| CaO | 2.8 |
| MgO | 2.3 |
| B2O3 | 13.3 |
| Na2O | 12.9 |
| K2O | 2.9 |
| BaO | 1.0 |
| ZnO | 1.5 |
The preparation method of the nuclear grade water filter element filter material of embodiment 3 comprises the following steps:
s1, mixing the microfiber glass wool and the glass fiber chopped strands according to a set proportion, adding water and citric acid, and uniformly stirring by a high-frequency fluffer to obtain slurry with the concentration of 4 wt% and the pH value of 2;
s2, diluting the obtained pulp after deslagging to be paper pulp suspension liquid with the concentration of 0.9 wt%, forming and dehydrating by a fourdrinier to form wet paper sheets, and drying to form a filter paper base material with the gram weight of 43g/m2；
S3, bonding the upper and lower surfaces of the substrate obtained in the step S2 as an intermediate layer to each other at a thickness of 10g/m2The PET non-woven fabric forms a composite filter material with a three-layer structure;
s4, soaking the composite filter material obtained in the step S3 in 8 wt% of waterborne acrylic resin and 2 wt% of waterborne polyurethane resin at a soaking rate of 20m/min, removing redundant waterborne resin through negative pressure suction of a vacuum suction box, and drying to obtain the nuclear-grade water filter element filter material.
The grammage of the obtained filter medium was 67g/m2The actual aperture is 1.5 mu m; the filtration precision is 0.6 μm and the air permeability is 52L/m2Sec, tensile strength of 0.35kN/m, strength retention of 65%.
The embodiments of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be regarded as the technical scope of the present invention.
Claims (8)
1. A nuclear grade water filter element filter material is characterized by comprising a base material made of micro glass fiber cotton with alkali metal content more than 9 percent and non-woven fabrics attached to the upper surface and the lower surface of the base material; the base material and the non-woven fabric are soaked in water-based resin, sucked under negative pressure and dried and bonded together; the base material comprises at least two kinds of micro glass fiber cotton with beating degrees and glass fiber chopped strands with lengths of 5-10 mm according to mass percentage (90-100): (0-10) after proportioning, sequentially removing slag, diluting, forming and dehydrating to form wet paper pages with uniform thickness, and then drying to form the wet paper pages; the beating degree is selected within the SR range of 34-60 degrees; the micro glass fiber cotton comprises the following components: SiO 2255.0～67.0%，Al2O34.0～7.0%，CaO 1.0～5.0%，MgO 0～4.0%，B2O34.0～14.0%，Na2O 8.0～17.0%，K21.0 to 4.0% of O, 0.1 to 6.0% of BaO and 0.1 to 5.0% of ZnO.
2. The nuclear grade water filter element filter of claim 1 wherein the aqueous resin is at least one of an aqueous polyurethane resin, an aqueous epoxy resin, an aqueous acrylate resin or an aqueous phenolic resin.
3. The nuclear grade water filter element filter material of claim 1, wherein the mass content of the water-based resin is 8 to 20wt% of the base material.
4. The nuclear grade water filter cartridge filter of claim 1 wherein the basis weight of the substrate is 10 to 60g/m2The aperture is 0.05-50 μm.
5. The filter element filtering material of nuclear grade water filter as claimed in claim 1, wherein the non-woven fabric is polyethylene terephthalate non-woven fabric, and the gram weight thereof is 10-20 g/m2。
6. The method for preparing the filter element filter material of the nuclear grade water filter as claimed in any one of claims 1 to 5, comprising the following steps:
s1, mixing microfiber glass wool and short glass fiber shreds according to a set proportion, adding water and inorganic acid, and uniformly dispersing to obtain slurry, wherein the concentration of the slurry is 0.5-5 wt%, and the pH value is 2.0-5.0;
s2, sequentially carrying out deslagging, diluting, forming and dehydrating on the slurry obtained in the step S1 to form wet paper pages with uniform thickness, and then drying to form a base material, wherein the diluted concentration is 0.1-1% wt;
s3, compounding non-woven fabrics on the upper surface and the lower surface by taking the base material obtained in the step S2 as an intermediate layer to form a composite filter material with a three-layer structure;
s4, soaking the composite filter material obtained in the step S3 in water-based resin, removing redundant water-based resin in a negative pressure suction mode, and drying to obtain the nuclear-grade water filter element filter material.
7. The method of making a nuclear grade water filter element filter of claim 6 wherein the rate of impregnation is controlled to be 0.1 to 20 m/min.
8. The method of making a nuclear grade water filter cartridge filter of claim 6 wherein the impregnated composite filter is subjected to suction under negative pressure using a vacuum suction box to remove excess aqueous resin.
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| CN110841375B (en) * | 2019-10-08 | 2020-09-22 | 南京玻璃纤维研究设计院有限公司 | Method for controlling glue content of filter material base material and purified filter material obtained by using method |
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