CN112023537B - Processing method of filter material of bag type dust collector - Google Patents
Processing method of filter material of bag type dust collector Download PDFInfo
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- CN112023537B CN112023537B CN201910478068.3A CN201910478068A CN112023537B CN 112023537 B CN112023537 B CN 112023537B CN 201910478068 A CN201910478068 A CN 201910478068A CN 112023537 B CN112023537 B CN 112023537B
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- 238000003672 processing method Methods 0.000 title claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 125
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 62
- 239000003094 microcapsule Substances 0.000 claims abstract description 60
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- 229920002907 Guar gum Polymers 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
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- 239000000665 guar gum Substances 0.000 claims description 3
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- 229910017053 inorganic salt Inorganic materials 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
Abstract
The invention relates to a method for processing a filter material of a bag type dust collector, which has high dust removal efficiency, chemical corrosion resistance, thermal shock resistance and high-temperature particulate matter scouring resistance. The invention is realized by the following technical scheme: the silica-containing phase-change energy storage microcapsule finishing agent is applied to a filter material through dipping/spraying/coating, and is subjected to pre-baking or natural curing after rolling and pressing to prepare the high-performance bag type dust collector filter material with high dust removal efficiency, chemical corrosion resistance, thermal shock resistance and high-temperature particulate matter scouring resistance. The method has the characteristics of simple process flow, convenient operation, wide applicability, capability of obviously improving the particulate matter removal efficiency of the existing filter material, effectively prolonging the service life of the existing filter material, improving the running stability and the like.
Description
Technical Field
The invention relates to the technical field of after-finishing processing of filter materials of a bag type dust collector and performance improvement of the filter materials of the bag type dust collector, in particular to a method for processing the filter materials of the bag type dust collector based on a silica phase change energy storage microcapsule finishing agent by a dipping, spraying or coating method.
Background
The bag dust removal technology is the most effective one,currently mainly used for industrial PM 2.5 Particulate matter emission control. With the continuous improvement of the PM in China 2.5 The discharge requirement of the particles further improves the particle removal efficiency of the bag type dust collector. The non-woven fabric filter bag produced by a non-woven process in the bag type dust collector is used as an important filter element for dust filtration. The filter material generally consists of two parts, namely framework base cloth and filtering action surface layer fibers. The waste gas of industrial industry generally contains Nitrogen Oxides (NO) x ) Sulfur Oxides (SO) x ) Accompanied by high humidity; in addition, in most industrial waste gas treatment processes, instantaneous high temperature and large amount of high temperature particulate matters exist, which seriously affect the filtration efficiency, service life and operation stability of the filter material.
At present, the performance of the filter material of the bag type dust collector is improved by adopting high-performance fiber filter materials, inorganic fiber filter materials, nanofiber composite filter materials, laminated films and the like from the fiber materials and manufacturing methods, the cost is high, and the process is complex. It is important to find a method for preparing the filter material of the high-performance bag type dust collector with low cost, simplicity, easy operation and wide applicability. Phase change energy storage materials absorb and store heat energy by using phase state or crystal transformation, but most of phase change materials are difficult to directly mix with other materials to apply to the surface of the materials, and cannot realize the functionality of the materials. Microcapsule technology is commonly used in industries such as medicine, food, cosmetics and the like, and a core material is coated in a wall material, so that stable storage, slow release and the like of active substances are realized, the processing performance of the core material is improved, and the application range of the core material is widened. Natural or synthetic organic polymers are generally used as wall materials in industry, such as polymethacrylates, glutaraldehyde-crosslinked chitosan, polydopamine, and melamine formaldehyde resins. The micro plastic organic wall materials have the problems of poor chemical stability, no high temperature resistance, flammability, easy decomposition, release of harmful substances in the use process and the like. The amorphous silica has the characteristics of good mechanical property, high chemical stability, good biocompatibility, flame retardance, high heat conductivity coefficient and the like, is a very promising heat insulation, flame retardance and chemical corrosion resistance material, and has high application value when the silica is used for preparing the high-performance bag-type dust collector filter material by an after-finishing processing technology based on the silica as a microcapsule packaging phase change material.
The preparation method comprises the steps of applying the finishing liquor containing the phase-change energy storage microcapsules containing silicon dioxide on a filter material through dipping/spraying/coating, and carrying out pre-baking or natural curing after rolling and pressing to prepare the high-performance bag type dust collector filter material with high dust collection efficiency, chemical corrosion resistance, thermal shock resistance and high-temperature particulate matter scouring resistance.
Disclosure of Invention
The invention aims to provide a processing method of a filter material of a bag type dust collector, and provides a high-performance bag type dust collector filter material which has high dust removal efficiency, chemical corrosion resistance, thermal shock resistance and high-temperature particulate matter scouring resistance, and is prepared by impregnating, spraying and coating a finishing agent based on a silicon dioxide phase change energy storage microcapsule on the filter material, rolling and pressing and then performing pre-baking, baking or natural curing. The method has the advantages of simple process flow, convenient operation and wide applicability, can obviously improve the particulate matter removal efficiency of the existing filter material, effectively prolong the service life of the existing filter material and improve the running stability.
The invention relates to a processing method of a filter material of a bag type dust collector, wherein the finishing agent in the preparation method is a silica phase change energy storage microcapsule finishing agent, the wall material is silica, and the core material is a phase change material. The silicon dioxide phase-change energy storage microcapsule can be stably dispersed in aqueous solution and used for aqueous finishing agent and applied to filter materials of the bag type dust collector; the silicon dioxide phase-change energy storage microcapsule powder can also be obtained by spray drying, freeze drying or other conventional drying methods, uniformly dispersed in a non-aqueous finishing agent by ultrasonic and other methods, and applied to a filter material of a bag type dust collector.
As a preferable technical scheme:
according to the processing method of the filter material of the bag type dust collector, the silicon dioxide phase-change energy storage microcapsule takes inorganic salt, aliphatic hydrocarbon, fatty acid, fatty alcohol, aliphatic amine and metal oxide as phase-change core materials, and inorganic silicon dioxide as wall materials; the grain size distribution is between 50 nanometers and 2 micrometers; the thickness of the silicon dioxide wall material is 5-500 nanometers;
according to the processing method of the filter material of the bag type dust collector, the silicon dioxide phase-change energy storage microcapsules can be stably dispersed in aqueous solution and used for aqueous finishing agent, and are applied to the filter material of the bag type dust collector; the silicon dioxide phase-change energy storage microcapsule powder can also be obtained by spray drying, freeze drying or other conventional drying methods, uniformly dispersed in a non-aqueous finishing agent by ultrasonic and other methods, and applied to a filter material of a bag type dust collector.
According to the processing method of the bag type dust collector filter material, the finishing agent comprises one or more of polyurethane or PTFE, dispersing agent or curing agent and the like, the phase-change energy storage microcapsules are dispersed in the finishing agent, and the dosage of the silicon dioxide phase-change energy storage microcapsules is 0.5-50% of the mass of the bag type dust collector filter material; the dispersing agent is silicate and alkali metal phosphate, triethylhexyl phosphoric acid, sodium dodecyl sulfate, methyl amyl alcohol, cellulose derivative, polyacrylamide, guar gum, fatty acid polyethylene glycol ester and the like, and the dosage is 0.05-20% of the mass of the silica phase change energy storage microcapsule; the curing agent accounts for 5 to 20 percent of the mass of the polyurethane or PTFE.
The finishing agent containing the silica phase change energy storage microcapsule can be applied to a filter material through dipping/spraying/coating, and then is subjected to pre-baking or natural curing after rolling to realize adhesion on the filter material of the bag type dust collector; the prepared rolling belt liquid rate is 50-200% or the coating weight is 10-500g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The pre-baking temperature is 80-120 ℃, the baking temperature is 110-380 ℃ or the curing reaction is carried out for 12-48 hours under the room temperature condition.
The invention also provides a processing method of the filter material of the bag type dust collector, which comprises the following steps:
a) Adding the aqueous solution or powder of the silica phase-change energy-storage microcapsule into a system containing a dispersing agent, a cross-linking agent and a curing agent, and fully and uniformly dispersing for 15-120min by ultrasonic oscillation to form a finishing agent;
b) The finishing agent is applied to the surface of the filter material of the bag type dust collector by methods such as dipping, padding, spraying or coating;
c) And B), curing the bag filter material treated in the step B) on the bag filter material through a baking-baking process or natural curing, thereby obtaining a high-performance bag filter material product based on the silica phase-change energy storage microcapsule.
The beneficial effects are that:
the invention provides a method for after-finishing a filter material of a bag type dust collector by a method of pre-baking or natural curing after rolling and pressing by using a silica phase change energy storage microcapsule finishing agent to be applied to the filter material through dipping/spraying/coating.
The filter material of the bag type dust collector prepared by the invention has the characteristics of small pore diameter, high dust removal efficiency, high mechanical property, chemical corrosion resistance, thermal shock resistance, high-temperature particulate matter scouring resistance and the like.
Drawings
FIG. 1 is a schematic diagram of a silica phase change energy storage microcapsule;
FIG. 2 is a scanning electron micrograph of a silica phase change energy storage microcapsule;
FIG. 3 is a transmission electron micrograph of a silica phase change energy storage microcapsule;
FIG. 4 is an electron micrograph of the high performance baghouse filter material prepared in example 1;
FIG. 5 is an electron micrograph of the high performance baghouse filter material prepared in example 2;
FIG. 6 is an electron micrograph of the high performance baghouse filter prepared in example 3;
FIG. 7 is a DSC graph;
FIG. 8 is a thermal hysteresis performance graph;
FIG. 9 is a graph of the performance of a high performance baghouse filter material.
Detailed Description
The invention is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
According to the processing method of the filter material of the bag type dust collector, the finishing agent is a silica phase change energy storage microcapsule finishing agent, the wall material is silica, and the core material is a phase change material. The silicon dioxide phase-change energy storage microcapsule can be stably dispersed in aqueous solution and used for aqueous finishing agent and applied to filter materials of the bag type dust collector; the silicon dioxide phase-change energy storage microcapsule powder can also be obtained by spray drying, freeze drying or other conventional drying methods, uniformly dispersed in a non-aqueous finishing agent by ultrasonic and other methods, and applied to a filter material of a bag type dust collector.
The phase change core material of the silica phase change energy storage microcapsule uses inorganic salt, aliphatic hydrocarbon, fatty acid, fatty alcohol, aliphatic amine, metal oxide and other materials, and the particle size distribution is between 50 nanometers and 2 microns.
The wall material of the silicon dioxide phase-change energy storage microcapsule adopts inorganic silicon dioxide, and the thickness of the wall material is 5-500 nanometers.
The silicon dioxide phase-change energy-storage microcapsule can be applied to a filter material of a bag type dust collector in a mode of being stably dispersed in an aqueous solution and being used for an aqueous finishing agent, or in a mode of obtaining silicon dioxide phase-change energy-storage microcapsule powder by adopting spray drying, freeze drying or other conventional drying methods and uniformly dispersing the powder in a non-aqueous finishing agent by adopting methods such as ultrasonic and the like.
The finishing agent comprises one or more of polyurethane or PTFE, dispersing agent or curing agent and the like, the phase-change energy storage microcapsule is dispersed in the finishing agent, and the dosage of the silicon dioxide phase-change energy storage microcapsule is 0.5-50% of the mass of the filter material of the bag type dust collector.
The dispersing agent is silicate and alkali metal phosphate, triethylhexyl phosphoric acid, sodium dodecyl sulfate, methyl amyl alcohol, cellulose derivative, polyacrylamide, guar gum, fatty acid polyethylene glycol ester and the like, and the dosage is 0.05-20% of the mass of the silica phase change energy storage microcapsule; the curing agent accounts for 5 to 20 percent of the mass of the polyurethane or PTFE.
Example 1
Uniformly dispersing the silica phase-change energy-storage microcapsule in polyurethane aqueous solution by ultrasonic waves to form a finishing agent, wherein the addition mass of the silica phase-change energy-storage microcapsule is 10% of the mass of a filter material, the dosage of polyurethane emulsion is 50g/L, the dosage of a dispersing agent is 5% of the mass of the silica phase-change energy storage, and the bath ratio is 1:5, after the dipping treatment, rolling (the liquid carrying rate is 100 percent), controlling the machine speed to run for 1m/min, and adopting a two-dipping and two-rolling process. And then pre-baking the sample at 90 ℃ for 3 minutes and baking the sample at 120 ℃ for 3 minutes to prepare the high-performance bag-type dust collector filter material with high dust collection efficiency, chemical corrosion resistance, thermal shock resistance and high-temperature particulate matter scouring resistance, as shown in figure 4.
Example 2
Uniformly dispersing the silica phase-change energy-storage microcapsule in PTFE (polytetrafluoroethylene) by ultrasonic waves to form a finishing agent, wherein the added mass of the silica phase-change energy-storage microcapsule is 20% of the mass of a filter material, the using amount of PTFE emulsion is 80 g/L, and the using amount of a dispersing agent is 10% of the mass of the silica phase-change energy storage, and the bath ratio is 1: after 10 dip treatment, rolling (with liquid rate of 150%), controlling the machine speed to run for 2m/min, and adopting a two-dip two-roll process. And then pre-baking the sample at 100 ℃ for 3 minutes and baking the sample at 380 ℃ for 3 minutes to prepare the high-performance bag-type dust collector filter material with high dust collection efficiency, chemical corrosion resistance, thermal shock resistance and high-temperature particulate matter scouring resistance, as shown in figure 5.
Example 3
The silica phase-change energy-storage microcapsule is uniformly dispersed in PTFE coating by ultrasonic and compounded to form a finishing agent, wherein the addition mass of the silica phase-change energy-storage microcapsule is 30% of the mass of a filter material, the consumption of a dispersing agent is 10% of the mass of the silica phase-change energy-storage microcapsule, the consumption of a curing agent is 10% of the mass of the PTFE coating, and the coating amount of the PTFE coating compounded finishing agent is controlled to be 500g/m 2 Naturally airing and solidifying at room temperature to prepare the high-performance bag type dust collector filter material with high dust removal efficiency, chemical corrosion resistance, thermal shock resistance and high-temperature particulate matter scouring resistance, as shown in figure 6.
As can be seen from the DSC curve of fig. 7, the filter material absorbs and stores heat in a substantial increase with increasing microcapsule addition.
The thermal hysteresis property in fig. 8 shows that the filter material without microcapsules has the fastest temperature rise, reaches the equilibrium temperature in a very short time, has almost no thermal regulation function, and the filter material with microcapsules shows more obvious hysteresis effect, and the larger the amount of microcapsules, the more obvious the hysteresis.
The high performance baghouse filter material correlation performance graph of fig. 9 is the response performance of the filter materials of examples 1-3 for 100 times of thermal shock at a high temperature of 140 c under conditions of holding 2M of H2SO4 solution. In the table, 0 indicates that no silica energy storage phase change microcapsule is added.
Claims (9)
1. A processing method of a filter material of a bag type dust collector is characterized by comprising the following steps of: the method comprises the following steps:
a) Adding the silicon dioxide phase-change energy storage microcapsule into a system containing a dispersing agent, a cross-linking agent or a curing agent, and fully and uniformly dispersing for 15-120min through ultrasonic oscillation to form a finishing agent; the silica phase-change energy-storage microcapsule takes inorganic salt, aliphatic hydrocarbon, fatty acid, fatty alcohol, fatty amine or metal oxide as a phase-change core material, inorganic silica is taken as a wall material, the particle size of the silica phase-change energy-storage microcapsule is distributed between 50 nanometers and 2 micrometers, and the thickness of the silica wall material is 5 nanometers to 500 nanometers;
b) Applying the finishing agent in the step A) to the surface of a filter material of the bag type dust collector;
c) And curing the finishing agent on the bag type dust collector filter material to obtain the bag type dust collector filter material based on the silica phase change energy storage microcapsule.
2. The method for processing the filter material of the bag filter according to claim 1, which is characterized in that: the method comprises the following steps:
a) Adding the aqueous solution or powder of the silica phase-change energy-storage microcapsule into a system containing a dispersing agent, a cross-linking agent or a curing agent, and fully and uniformly dispersing for 15-120min by ultrasonic oscillation to form a finishing agent;
b) The finishing agent is applied to the surface of the filter material of the bag type dust collector by a dipping, padding, spraying or coating method;
c) And B), curing the bag type dust collector filter material treated in the step B) on the bag type dust collector filter material through a baking process or natural curing, thereby obtaining the bag type dust collector filter material based on the silica phase change energy storage microcapsule.
3. A method for processing filter materials of a bag filter according to claim 1 or 2, which is characterized in that: the silica phase change energy storage microcapsule in the step A) is stably dispersed in an aqueous solution and used for an aqueous finishing agent, and is applied to a filter material of a bag type dust collector.
4. A method for processing filter materials of a bag filter according to claim 1 or 2, which is characterized in that: and (C) the silicon dioxide phase-change energy-storage microcapsule in the step A) is subjected to spray drying and freeze drying to obtain silicon dioxide phase-change energy-storage microcapsule powder, and the silicon dioxide phase-change energy-storage microcapsule powder is uniformly dispersed in a non-aqueous finishing agent and is applied to a filter material of a bag type dust collector.
5. A method of processing filter media for a bag house according to claim 3, wherein: the system comprises one of polyurethane or PTFE and also comprises a dispersing agent; the silicon dioxide phase-change energy-storage microcapsule is dispersed in the system, and the dosage of the silicon dioxide phase-change energy-storage microcapsule is 0.5 to 50 percent of the mass of the filter material of the bag type dust collector.
6. The method for processing the filter material of the bag filter as defined in claim 4, which is characterized in that: the system comprises one of polyurethane or PTFE, and further comprises a dispersing agent and a curing agent; the phase-change energy-storage microcapsule is dispersed in the system, and the dosage of the silicon dioxide phase-change energy-storage microcapsule is 0.5 to 50 percent of the mass of the filter material of the bag type dust collector.
7. A method for processing filter material of a bag filter according to claim 1 or 2, characterized in that: the dispersing agent is silicate, alkali metal phosphate, triethylhexyl phosphoric acid, sodium dodecyl sulfate, methyl amyl alcohol, cellulose derivative, polyacrylamide, guar gum or fatty acid polyethylene glycol ester, and the dosage of the dispersing agent is 0.05-20% of the mass of the silicon dioxide phase-change energy storage microcapsule.
8. A method for processing filter material of a bag filter according to claim 1 or 2, characterized in that: the curing agent accounts for 5 to 20 percent of the mass of the polyurethane or PTFE.
9. The method for processing the filter material of the bag filter according to claim 1, which is characterized in that: the finishing agent containing the silica phase change energy storage microcapsule is applied to the filter material through dipping, spraying or coating, and then is subjected to baking process or natural curing after rolling; realizing adhesion on filter materials of the bag type dust collector; the preparation of the rolling belt liquid has the rate of 50-200% or the coating weight of 10-500g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The pre-baking temperature in the baking process is 80-120 ℃ and the baking temperature is 110-380 ℃; naturally solidifying to form a solidification reaction after standing for 12-48 hours at room temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
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