CN107746222B - Recycling method of dust removal filter bag of coal-fired power plant - Google Patents
Recycling method of dust removal filter bag of coal-fired power plant Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention relates to a recycling method of a dust removal filter bag of a coal-fired power plant, which comprises the following steps: cutting waste filter bags, removing floating ash and opening by using a licker-in sequence, so that filter bag fibers which are compressed in the filter bags and are mutually wound are reduced into flocculent fibers, then the flocculent fibers are cut into short fibers meeting the requirements, the short fibers are uniformly dispersed in a part of cement dry powder by a high-speed shearing machine to be dry-mixed to form a fiber cement dry powder mixture, other solid materials are dry-mixed and uniformly mixed, the fiber cement dry powder mixture and the uniformly mixed other solid materials are dry-mixed together, finally, water is added for stirring, and the waste filter bag fiber reinforced concrete is prepared by a conventional concrete forming process and a conventional curing process. The filter material does not need to completely remove the fly ash covered around the fibers of the waste filter bag, and part of the fine particle fly ash permeates into the filter material, so that the compatibility of the short fibers and the concrete matrix is favorably improved.
Description
Technical Field
The invention belongs to the technical field of environment protection of recycling of waste filter bags and also belongs to the technical field of fiber concrete composite materials, and particularly relates to a recycling method of a dust removal filter bag of a coal-fired power plant.
Background
9-month-2014 national reform Commission, environmental protection department and national energy agency issue' about printing and publishing together<Coal-electricity energy-saving emission-reducing upgrading and transforming action plan>(2014-2020) modified energy [2014]2093), proposed 10mg/Nm3The ultra-low emission limit value is required, most of the existing thermal power generating units face the problem of modification of an electric dust collector aiming at increasingly strict pollutant emission standards of a thermal power plant, and the conventional modification of the electric dust collector into a bag type dust collector or an electric bag composite dust collector occupies a considerable part of the field of modification of the dust collectorThe proportion, the filter bag design life of bag collector is generally 4 years, and the life-span is about 3 years when the real use, and a large amount of abandonment filter bags need constantly to be changed in the bag collector operation in-process, and the filter bag material mainly includes polyphenylene sulfide (PPS), polyimide (P84), Polytetrafluoroethylene (PTFE), glass fiber, basalt fiber or above-mentioned fibre blending etc.. At present, the general disposal method of the waste filter bags is burying or burning, but in recent years, some new recycling methods are appeared, wherein patents with application numbers of 201310696503.2, 201410737552.0, 201410612887.X and the like propose methods for recycling PPS or PTFE in the waste filter bags, and the methods mainly relate to the cleaning, drying and raw material preparation of the waste filter bags for reprocessing.
The fiber reinforced concrete is a new type civil engineering material which is formed from cement paste, mortar or concrete as base material and discontinuous short fiber or continuous long fiber as reinforcing material, and uniformly blended in the concrete, and the addition of fiber can improve the concrete performance from several aspects, and can greatly raise tensile strength, deformability, wear resistance, impermeability and impact resistance of concrete, but the dispersion of fiber in concrete can obviously affect the plasticity resistance and cracking property of the final concrete. At present, most of fiber concrete molding processes are to add fibers, cement, gravel and the like directly for dry mixing, add water for mixing, and finally maintain, harden and mold. According to the method, the dispersibility of the fiber, especially the synthetic fiber, in the concrete is poor, and the prepared fiber concrete has the defects of stress concentration and the like, so that the mechanical property of the material is far lower than the expected property, and the application range of the fiber concrete is limited. And a large amount of fly ash covers around the fibers of the waste filter bag, and part of fine particle fly ash permeates into the filter material, so that the compatibility of the fibers and the concrete matrix is increased. The fly ash is used as a concrete admixture to participate in a cement reaction, and is beneficial to increasing the bonding force between fibers and the surface of concrete.
Disclosure of Invention
The invention aims to solve the defects of economic waste and environmental pollution caused by the fact that the fiber of the dust-removing filter bag of a coal-fired power plant cannot be reused after being used and can only be deeply buried or burnt, and also solves the defects of low tensile strength, poor toughness, poor crack resistance and the like of the traditional concrete, and provides a recycling method of the dust-removing filter bag of the coal-fired power plant.
The technical scheme adopted by the invention for solving the problems is as follows: a recycling method of a coal-fired power plant dust removal filter bag is characterized by comprising the following steps: the method comprises the following steps: cutting, removing floating ash and loosening the waste filter bags in sequence by using a licker-in so as to reduce filter bag fibers which are compressed in the filter bags and are mutually wound into flocculent fibers, shearing the flocculent fibers into short fibers meeting the requirements, uniformly dispersing the short fibers in a part of cement dry powder by using a high-speed shearing machine to be dry-mixed to form a fiber cement dry powder mixture, dry-mixing and uniformly mixing other solid materials, dry-mixing the fiber cement dry powder mixture and the uniformly mixed other solid materials together, finally adding water for stirring, and preparing the waste filter bag fiber reinforced concrete by using a conventional concrete forming process and a curing process; wherein the other solid materials comprise residual cement dry powder, aggregate and admixture.
When the invention is used for removing floating ash from the waste filter bag, the fly ash is completely removed without carrying out various chemical cleaning, and only loose floating ash outside the filter bag fiber in the cut filter bag is removed by the dust removing equipment. For blend fibers, it is also not necessary to distinguish them by composition.
The cement dry powder is divided into two parts, wherein one part of the cement dry powder is mixed with the short fiber to form a fiber cement dry powder mixture, the rest of the cement dry powder, the aggregate and the admixture are mixed, and the mass ratio of the part of the cement dry powder to the rest of the cement dry powder is 0.01: 1-1: 1.
The filter bag fiber is chopped fiber, and the length of the filter bag fiber is 3mm-50 mm.
When the short fiber and a part of the cement dry powder are dry mixed, the shearing time of the high-speed shearing machine is 5-40 seconds, and the shearing speed of the high-speed shearing machine is 10000 r/min-50000 r/min.
The filter bag fiber is waste dust removal filter bag fiber of a coal-fired power plant, and the filter bag fiber is made of one or more of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fiber and basalt fiber. But the material is not limited thereto.
The mass fraction of the short fiber in the waste filter bag fiber reinforced concrete is 0-1.5%.
The waste filter bag fiber reinforced concrete is common concrete with the grade of C30-C60.
The cement dry powder is portland cement, ordinary portland cement, portland slag cement, pozzolanic portland cement, fly ash portland cement or composite portland cement.
Compared with the prior art, the filter material does not need to completely remove the fly ash covered around the fibers of the waste filter bag, and part of the fine particle fly ash permeates into the filter material, so that the compatibility of the short fibers and the concrete matrix is favorably improved. Active part Si0 in fly ash2And A1203Ca (OH) produced by hydration with cement2The reaction is carried out to generate a large amount of hydrated silicic acid gel, which is beneficial to increasing the bonding force of the fiber and the concrete surface.
Drawings
FIG. 1 is a flow chart of a recycling method of a dust filter bag of a coal-fired power plant in embodiments 1-4 of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention. Other various raw materials used in the embodiments of the present invention are commercially available, wherein the water reducing agent is a polycarboxylic acid water reducing agent, and is produced by Jiangsu Subo New Material Co.
Comparison group
This example is a concrete production method to prepare 1m3The concrete specifically comprises the following steps:
(1) mixing the cement dry powder and the aggregate (or other admixture), and uniformly mixing the mixture in a dry mode to form the component B.
Preferably, sand and crushed stone are used as the aggregate (or other admixtures) in this embodiment.
Preferably, in this embodiment, the mass of the sand is 713kg and the mass of the crushed stone is 1214 kg.
In this example, the total mass of the cement dry powder used was 305 kg.
Preferably, the dry cement powder in this example is 42.5 portland cement, produced by hangzhou qian cheng chao cement limited.
(2) Preparing concrete: and adding water into the component B, and uniformly stirring, densely forming, curing and hardening to obtain the concrete.
Preferably, the water reducing agent is added in the mixing process of the component B.
Preferably, the water reducing agent is added in an amount of 5.19kg by mass.
Preferably, the mass of water added is 168 kg.
In this example, the compressive strength of the concrete was 31.8MPa, and the flexural strength was 9.23 MPa.
Example 1.
See fig. 1.
This embodiment is a recycling method of a dust filter bag of a coal-fired power plant, which is used for preparing 1m dust filter bag3The waste filter bag fiber reinforced concrete specifically comprises the following steps:
(1) ① cutting waste filter bag fiber, removing metal rings on the recovered waste filter bag, cutting and paving at the seam along the axial direction of the waste filter bag, cutting into filter cloth strips with width of 50mm by a cutting machine, ② removing floating ash, placing the cut filter cloth strips into a dust removing device to remove the floating ash, putting dust into a collecting bag, treating the filter cloth strips by the dust removing device to obtain filter cloth strips with dust content of 3%, compressing and winding filter bag fibers in the filter cloth strips, ③ opening by a licker-in, placing the filter cloth strips into an opener, opening the filter cloth strips into flocculent fibers in the opener, and crushing the flocculent fibers containing dust into short fibers with fiber length of 3mm-50mm for later use.
Preferably, the filter bag fibers in this embodiment are chopped fibers.
Preferably, the mass of the chopped fibers in this example is 5.19 kg.
When the floating ash is removed from the filter cloth strip, the fly ash is completely removed without carrying out various chemical cleaning, and only the loose floating ash outside the filter bag fiber in the filter cloth strip is removed by the dust removing equipment. For blend fibers, it is also not necessary to distinguish them by composition.
Preferably, the material of the filter bag fiber is one of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fiber and basalt fiber. Or blended fibers formed by any two, three, four or five of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fibers and basalt fibers can be selected. But the material is not limited thereto.
Preferably, the material of the filter bag fiber in this embodiment is PPS.
(2) Pre-mixing the chopped fibers and the cement dry powder: mixing the short fibers and part of the dry cement powder in a high-speed shearing machine for a period of time according to a proper proportion, uniformly dispersing the short fibers in the dry cement powder through the high-speed shearing machine, and performing dry mixing to form a fiber cement dry powder mixture, wherein the fiber cement dry powder mixture is a fiber cement premix. The fiber cement premix is a component A.
Preferably, the shearing time of the high-speed shearing machine is 5 seconds to 40 seconds.
Most preferably, the shear time of the high speed shears in this embodiment is 10 seconds.
Preferably, the shearing speed of the high-speed shearing machine is 10000 r/min-50000 r/min.
Most preferably, the shear rate of the high speed shear is 30000 r/min.
The cement dry powder is portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, fly ash portland cement or composite portland cement.
Preferably, the dry cement powder in this example is 42.5 portland cement, produced by hangzhou qian cheng chao cement limited.
(3) Mixing the residual cement dry powder and the aggregate (or other admixture), and uniformly mixing the mixture in a dry mode to form the component B.
Preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.01: 1-1: 1.
Most preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.25: 1.
Preferably, sand and crushed stone are used as the aggregate (or other admixtures) in this embodiment.
Preferably, in this embodiment, the mass of the sand is 713kg and the mass of the crushed stone is 1214 kg.
In this example, the mass of the dry cement powder used in the step (2) and the mass of the remaining dry cement powder used in the step (3) total 305 kg.
(4) Preparing waste filter bag fiber reinforced concrete: and mixing the component A and the component B, adding water, uniformly stirring, densely forming, maintaining and hardening to obtain the waste filter bag fiber reinforced concrete.
The waste filter bag fiber reinforced concrete is common concrete with grade C30-C60.
Preferably, the water reducing agent is added in the mixing process of the component A and the component B.
Preferably, the water reducing agent is added in an amount of 5.19kg by mass.
Preferably, the mass of water added is 168 kg.
In the embodiment, the compressive strength of the waste filter bag fiber reinforced concrete is 40.2MPa, and the flexural strength is 9.85 MPa.
Example 2.
See fig. 1.
This embodiment is a recycling method of a dust filter bag of a coal-fired power plant, which is used for preparing 1m dust filter bag3The waste filter bag fiber reinforced concrete specifically comprises the following steps:
(1) ① cutting waste filter bag fiber, removing metal rings on the recovered waste filter bag, cutting and paving at the seam along the axial direction of the waste filter bag, cutting into filter cloth strips with width of 50mm by a cutting machine, ② removing floating ash, placing the cut filter cloth strips into a dust removing device to remove the floating ash, putting dust into a collecting bag, treating the filter cloth strips by the dust removing device to obtain filter cloth strips with dust content of 3%, compressing and winding filter bag fibers in the filter cloth strips, ③ opening by a licker-in, placing the filter cloth strips into an opener, opening the filter cloth strips into flocculent fibers in the opener, and crushing the flocculent fibers containing dust into short fibers with fiber length of 3mm-50mm for later use.
Preferably, the filter bag fibers in this embodiment are chopped fibers.
Preferably, the mass of the chopped fibers in this example is 10.41 kg.
When the floating ash is removed from the filter cloth strip, the fly ash is completely removed without carrying out various chemical cleaning, and only the loose floating ash outside the filter bag fiber in the filter cloth strip is removed by the dust removing equipment. For blend fibers, it is also not necessary to distinguish them by composition.
Preferably, the material of the filter bag fiber is one of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fiber and basalt fiber. Or blended fibers formed by any two, three, four or five of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fibers and basalt fibers can be selected. But the material is not limited thereto.
Preferably, the material of the filter bag fiber in this embodiment is PPS.
(2) Pre-mixing the chopped fibers and the cement dry powder: mixing the short fibers and part of the dry cement powder in a high-speed shearing machine for a period of time according to a proper proportion, uniformly dispersing the short fibers in the dry cement powder through the high-speed shearing machine, and performing dry mixing to form a fiber cement dry powder mixture, wherein the fiber cement dry powder mixture is a fiber cement premix. The fiber cement premix is a component A.
Preferably, the shearing time of the high-speed shearing machine is 5 seconds to 40 seconds.
Most preferably, the shear time of the high speed shears in this embodiment is 10 seconds.
Preferably, the shearing speed of the high-speed shearing machine is 10000 r/min-50000 r/min.
Most preferably, the shear rate of the high speed shear is 30000 r/min.
The cement dry powder is portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, fly ash portland cement or composite portland cement.
Preferably, the dry cement powder in this example is 42.5 portland cement, produced by hangzhou qian cheng chao cement limited.
(3) Mixing the residual cement dry powder and the aggregate (or other admixture), and uniformly mixing the mixture in a dry mode to form the component B.
Preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.01: 1-1: 1.
Most preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.25: 1.
Preferably, sand and crushed stone are used as the aggregate (or other admixtures) in this embodiment.
Preferably, in this embodiment, the mass of the sand is 713kg and the mass of the crushed stone is 1214 kg.
In this example, the mass of the dry cement powder used in the step (2) and the mass of the remaining dry cement powder used in the step (3) total 305 kg.
(4) Preparing waste filter bag fiber reinforced concrete: and mixing the component A and the component B, adding water, uniformly stirring, densely forming, maintaining and hardening to obtain the waste filter bag fiber reinforced concrete.
The waste filter bag fiber reinforced concrete is common concrete with grade C30-C60.
Preferably, the water reducing agent is added in the mixing process of the component A and the component B.
Preferably, the water reducing agent is added in an amount of 5.19kg by mass.
Preferably, the mass of water added is 168 kg.
In the embodiment, the compressive strength and the breaking strength of the waste filter bag fiber reinforced concrete are respectively 38.9MPa and 10.01 MPa.
Example 3.
See fig. 1.
This embodiment is a recycling method of a dust filter bag of a coal-fired power plant, which is used for preparing 1m dust filter bag3The waste filter bag fiber reinforced concrete specifically comprises the following steps:
(1) ① cutting waste filter bag fiber, removing metal rings on the recovered waste filter bag, cutting and paving at the seam along the axial direction of the waste filter bag, cutting into filter cloth strips with width of 50mm by a cutting machine, ② removing floating ash, placing the cut filter cloth strips into a dust removing device to remove the floating ash, putting dust into a collecting bag, treating the filter cloth strips by the dust removing device to obtain filter cloth strips with dust content of 3%, compressing and winding filter bag fibers in the filter cloth strips, ③ opening by a licker-in, placing the filter cloth strips into an opener, opening the filter cloth strips into flocculent fibers in the opener, and crushing the flocculent fibers containing dust into short fibers with fiber length of 3mm-50mm for later use.
Preferably, the filter bag fibers in this embodiment are chopped fibers.
Preferably, the mass of the chopped fibers in this example is 5.19 kg.
When the floating ash is removed from the filter cloth strip, the fly ash is completely removed without carrying out various chemical cleaning, and only the loose floating ash outside the filter bag fiber in the filter cloth strip is removed by the dust removing equipment. For blend fibers, it is also not necessary to distinguish them by composition.
Preferably, the material of the filter bag fiber is one of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fiber and basalt fiber. Or blended fibers formed by any two, three, four or five of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fibers and basalt fibers can be selected. But the material is not limited thereto.
Preferably, the material of the filter bag fiber in this embodiment is PTFE.
(2) Pre-mixing the chopped fibers and the cement dry powder: mixing the short fibers and part of the dry cement powder in a high-speed shearing machine for a period of time according to a proper proportion, uniformly dispersing the short fibers in the dry cement powder through the high-speed shearing machine, and performing dry mixing to form a fiber cement dry powder mixture, wherein the fiber cement dry powder mixture is a fiber cement premix. The fiber cement premix is a component A.
Preferably, the shearing time of the high-speed shearing machine is 5 seconds to 40 seconds.
Most preferably, the shear time of the high speed shears in this embodiment is 10 seconds.
Preferably, the shearing speed of the high-speed shearing machine is 10000 r/min-50000 r/min.
Most preferably, the shear rate of the high speed shear is 30000 r/min.
The cement dry powder is portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, fly ash portland cement or composite portland cement.
Preferably, the dry cement powder in this example is 42.5 portland cement, produced by hangzhou qian cheng chao cement limited.
(3) Mixing the residual cement dry powder and the aggregate (or other admixture), and uniformly mixing the mixture in a dry mode to form the component B.
Preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.01: 1-1: 1.
Most preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.25: 1.
Preferably, sand and crushed stone are used as the aggregate (or other admixtures) in this embodiment.
Preferably, in this embodiment, the mass of the sand is 713kg and the mass of the crushed stone is 1214 kg.
In this example, the mass of the dry cement powder used in the step (2) and the mass of the remaining dry cement powder used in the step (3) total 305 kg.
(4) Preparing waste filter bag fiber reinforced concrete: and mixing the component A and the component B, adding water, uniformly stirring, densely forming, maintaining and hardening to obtain the waste filter bag fiber reinforced concrete.
The waste filter bag fiber reinforced concrete is common concrete with grade C30-C60.
Preferably, the water reducing agent is added in the mixing process of the component A and the component B.
Preferably, the water reducing agent is added in an amount of 5.19kg by mass.
Preferably, the mass of water added is 168 kg.
In the embodiment, the compressive strength and the breaking strength of the waste filter bag fiber reinforced concrete are 36.2MPa and 9.36 MPa.
Example 4.
See fig. 1.
This embodiment is a recycling method of a dust filter bag of a coal-fired power plant, which is used for preparing 1m dust filter bag3The waste filter bag fiber reinforced concrete specifically comprises the following steps:
(1) ① cutting waste filter bag fiber, removing metal rings on the recovered waste filter bag, cutting and paving at the seam along the axial direction of the waste filter bag, cutting into filter cloth strips with width of 50mm by a cutting machine, ② removing floating ash, placing the cut filter cloth strips into a dust removing device to remove the floating ash, putting dust into a collecting bag, treating the filter cloth strips by the dust removing device to obtain filter cloth strips with dust content of 3%, compressing and winding filter bag fibers in the filter cloth strips, ③ opening by a licker-in, placing the filter cloth strips into an opener, opening the filter cloth strips into flocculent fibers in the opener, and crushing the flocculent fibers containing dust into short fibers with fiber length of 3mm-50mm for later use.
Preferably, the filter bag fibers in this embodiment are chopped fibers.
Preferably, the mass of the chopped fibers in this example is 5.19 kg.
When the floating ash is removed from the filter cloth strip, the fly ash is completely removed without carrying out various chemical cleaning, and only the loose floating ash outside the filter bag fiber in the filter cloth strip is removed by the dust removing equipment. For blend fibers, it is also not necessary to distinguish them by composition.
Preferably, the material of the filter bag fiber is one of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fiber and basalt fiber. Or blended fibers formed by any two, three, four or five of Polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyimide (P84), glass fibers and basalt fibers can be selected. But the material is not limited thereto.
Preferably, the material of the filter bag fiber in the present embodiment is P84.
(2) Pre-mixing the chopped fibers and the cement dry powder: mixing the short fibers and part of the dry cement powder in a high-speed shearing machine for a period of time according to a proper proportion, uniformly dispersing the short fibers in the dry cement powder through the high-speed shearing machine, and performing dry mixing to form a fiber cement dry powder mixture, wherein the fiber cement dry powder mixture is a fiber cement premix. The fiber cement premix is a component A.
Preferably, the shearing time of the high-speed shearing machine is 5 seconds to 40 seconds.
Most preferably, the shear time of the high speed shears in this embodiment is 10 seconds.
Preferably, the shearing speed of the high-speed shearing machine is 10000 r/min-50000 r/min.
Most preferably, the shear rate of the high speed shear is 30000 r/min.
The cement dry powder is portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, fly ash portland cement or composite portland cement.
Preferably, the dry cement powder in this example is 42.5 portland cement, produced by hangzhou qian cheng chao cement limited.
(3) Mixing the residual cement dry powder and the aggregate (or other admixture), and uniformly mixing the mixture in a dry mode to form the component B.
Preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.01: 1-1: 1.
Most preferably, the mass ratio of the cement dry powder in the component A to the cement dry powder in the component B is 0.25: 1.
Preferably, sand and crushed stone are used as the aggregate (or other admixtures) in this embodiment.
Preferably, in this embodiment, the mass of the sand is 713kg and the mass of the crushed stone is 1214 kg.
In this example, the mass of the dry cement powder used in the step (2) and the mass of the remaining dry cement powder used in the step (3) total 305 kg.
(4) Preparing waste filter bag fiber reinforced concrete: and mixing the component A and the component B, adding water, uniformly stirring, densely forming, maintaining and hardening to obtain the waste filter bag fiber reinforced concrete.
The waste filter bag fiber reinforced concrete is common concrete with grade C30-C60.
Preferably, the water reducing agent is added in the mixing process of the component A and the component B.
Preferably, the water reducing agent is added in an amount of 5.19kg by mass.
Preferably, the mass of water added is 168 kg.
In the embodiment, the compressive strength of the waste filter bag fiber reinforced concrete is 35.7MPa, and the flexural strength is 9.45 MPa.
Table 1 shows the formulation quality and performance data for the comparative example with the number A, example 1 with the number B, example 2 with the number C, example 3 with the number D and example 4 with the number E and for examples 1 to 4.
TABLE 1
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (8)
1. A recycling method of a coal-fired power plant dust removal filter bag is characterized by comprising the following steps: the method comprises the following steps: cutting, removing floating ash and loosening the waste filter bags in sequence by using a licker-in so as to reduce filter bag fibers which are compressed in the filter bags and are mutually wound into flocculent fibers, shearing the flocculent fibers into short fibers meeting the requirements, uniformly dispersing the short fibers in a part of cement dry powder by using a high-speed shearing machine to be dry-mixed to form a fiber cement dry powder mixture, dry-mixing and uniformly mixing other solid materials, dry-mixing the fiber cement dry powder mixture and the uniformly mixed other solid materials together, finally adding water for stirring, and preparing the waste filter bag fiber reinforced concrete by using a conventional concrete forming process and a curing process; and when the floating ash is removed from the waste filter bag, the loose floating ash outside the filter bag fiber in the cut filter bag is removed only by dust removal equipment.
2. The recycling method of the dust filter bag of the coal-fired power plant according to claim 1, which is characterized in that: the dry cement powder is divided into two parts, wherein one part of the dry cement powder is mixed with the short fibers to form a dry fiber cement powder mixture, the rest of the dry cement powder is mixed with the aggregate and the admixture, and the mass ratio of the one part of the dry cement powder to the rest of the dry cement powder is 0.01: 1-1: 1.
3. The recycling method of the dust filter bag of the coal-fired power plant according to claim 1, which is characterized in that: the filter bag fiber is chopped fiber, and the length of the filter bag fiber is 3mm-50 mm.
4. The recycling method of the dust filter bag of the coal-fired power plant according to claim 1, which is characterized in that: when the short fibers and a part of the cement dry powder are dry-mixed, the shearing time of the high-speed shearing machine is 5-40 seconds, and the shearing speed of the high-speed shearing machine is 10000 r/min-50000 r/min.
5. The recycling method of the dust filter bag of the coal-fired power plant according to claim 1, characterized in that: the filter bag fiber is made of one or more of polytetrafluoroethylene, polyphenylene sulfide, polyimide, glass fiber and basalt fiber.
6. The recycling method of the dust filter bag of the coal-fired power plant according to claim 1, characterized in that: the mass fraction of the short fiber in the waste filter bag fiber reinforced concrete is 0-1.5%.
7. The recycling method of the dust filter bag of the coal-fired power plant according to claim 1, characterized in that: the waste filter bag fiber reinforced concrete is common concrete of grade C30-C60.
8. The recycling method of the dust filter bag of the coal-fired power plant according to claim 1, characterized in that: the cement dry powder is portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, fly ash portland cement or composite portland cement.
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| CN111979643A (en) * | 2020-08-20 | 2020-11-24 | 南京际华三五二一环保科技有限公司 | Method for preparing heat-resistant heat-insulating material by using waste filter bag |
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| CN102241492A (en) * | 2011-03-29 | 2011-11-16 | 太原理工大学 | Waste textile fiber heat-insulating bearing concrete |
| CN103144221A (en) * | 2013-04-03 | 2013-06-12 | 北京国兴五佳高分子纤维再生科技有限公司 | Method and system of recovering PPS (polyphenylene sulfide) in waste dust removal bag |
| CN103264040A (en) * | 2013-05-16 | 2013-08-28 | 上海博格工业用布有限公司 | Process for manufacturing sheet material by utilizing waste filter bag |
| CN104353658A (en) * | 2014-11-05 | 2015-02-18 | 湖州格尔泰斯环保技术有限公司 | Waste PTFE dedusting filter-bag recycling method |
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| CN102241492A (en) * | 2011-03-29 | 2011-11-16 | 太原理工大学 | Waste textile fiber heat-insulating bearing concrete |
| CN103144221A (en) * | 2013-04-03 | 2013-06-12 | 北京国兴五佳高分子纤维再生科技有限公司 | Method and system of recovering PPS (polyphenylene sulfide) in waste dust removal bag |
| CN103264040A (en) * | 2013-05-16 | 2013-08-28 | 上海博格工业用布有限公司 | Process for manufacturing sheet material by utilizing waste filter bag |
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Address after: Hangzhou City, Zhejiang Province, 310030 Xihu District science and Technology Park of West Lake Park Road, No. 10 Applicant after: Huadian Power Science Research Institute Co., Ltd. Address before: Hangzhou City, Zhejiang Province, 310030 Xihu District science and Technology Park of West Lake Park Road, No. 10 Applicant before: China Huadian Electric Research Institute |
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