CN112113238A - Fluorine lining pipe flue gas heating system - Google Patents
Fluorine lining pipe flue gas heating system Download PDFInfo
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- CN112113238A CN112113238A CN202011041225.3A CN202011041225A CN112113238A CN 112113238 A CN112113238 A CN 112113238A CN 202011041225 A CN202011041225 A CN 202011041225A CN 112113238 A CN112113238 A CN 112113238A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The invention discloses a fluorine-lined pipe flue gas heating system, which comprises a pressure reducer, a heat exchanger and a chimney, wherein the heat exchanger comprises a shell, the upper end and the lower end of the shell are respectively provided with an air inlet and a water outlet, the upper end and the lower end in the shell are respectively provided with a pipe plate, a heat exchange chamber is formed between the two pipe plates, a plurality of heat exchange pipes are inserted between the two pipe plates, and the side wall of the shell is provided with a flue gas inlet pipe and a flue gas outlet pipe which are communicated with the heat exchange chamber; the heat exchange tube, the shell and the tube plate are made of carbon steel, the outer wall of the heat exchange tube, the inner wall of the shell and the two side walls of the plate tube form a spraying layer through anticorrosive spraying treatment, outer linings are arranged on the outer wall of the heat exchange tube, the inner wall of the shell and the two side walls of the plate tube and are subjected to anticorrosive spraying treatment, and the outer linings are made of fluoroplastics.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to a fluorine-lined pipe flue gas heating system.
Background
The energy structure of China is mainly coal, and harmful gases such as sulfur dioxide and sulfur trioxide generated by coal combustion are one of the important reasons for air pollution and acid rain. At present, the wet Flue Gas Desulfurization (FGD) process is still dominant in the flue gas desulfurization process of large-scale coal-fired equipment. The wet flue gas desulfurization process mainly uses lime slurry to wash flue gas in a desulfurization tower, and obtains higher desulfurization efficiency by increasing gas-liquid contact area.
The temperature of the flue gas after wet desulphurization is generally between 40 and 50 ℃, the water vapor content is in a saturated state, and the flue gas carries a plurality of liquid drops with different sizes. Although the demister is arranged in the desulfurizing tower, the removing capability of the common flat plate demister and folded plate demister to liquid drops with smaller diameter is very limited, and the problem of secondary carrying of the liquid drops is easy to occur, so that a large amount of liquid drops still exist in the flue gas at the outlet of the desulfurizing tower. The liquid drops contain high-concentration acidic ions such as SO42-, SO32-, Cl-, F-and the like, SO that the liquid drops are acidic and have strong corrosivity, and the liquid drops are extremely easy to cause compound low-temperature corrosion to a downstream flue and a chimney. And because the smoke discharging temperature is lower, the buoyancy of the smoke is also lower, the diffusion of pollutants in the smoke is very unfavorable, and the concentration of the pollutants near the equipment on the ground is increased. After the low-temperature flue gas is discharged from the chimney, the saturated water vapor condenses when cooled, and a large amount of white mist is formed.
In order to avoid the problems, a flue gas heating system can be additionally arranged behind the desulfurizing tower, and the flue gas after desulfurization is discharged by a chimney after the temperature of the flue gas is raised. However, the heat exchanger in the existing heating system has poor corrosion resistance, so that the service life of the heat exchanger is shortened, and the maintenance cost of the heating system is greatly increased.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a fluorine-lined pipe flue gas heating system with good corrosion resistance.
In order to achieve the purpose, the invention provides the following technical scheme: a fluorine-lined pipe flue gas heating system comprises a pressure reducer, a heat exchanger and a chimney, wherein the heat exchanger comprises a shell, the upper end and the lower end of the shell are respectively provided with an air inlet and a water outlet, the upper end and the lower end in the shell are respectively provided with a pipe plate, a heat exchange chamber is formed between the two pipe plates, a plurality of heat exchange pipes are inserted between the two pipe plates, and the side wall of the shell is provided with a flue gas inlet pipe and a flue gas outlet pipe which are communicated with the heat exchange chamber; the heat exchange tube, the shell and the tube plate are made of carbon steel, the outer wall of the heat exchange tube, the inner wall of the shell and the two side walls of the plate tube form a spraying layer through anticorrosive spraying treatment, outer linings are arranged on the outer wall of the heat exchange tube, the inner wall of the shell and the two side walls of the plate tube and are subjected to anticorrosive spraying treatment, and the outer linings are made of fluoroplastics.
By adopting the technical scheme, the outer wall of the heat pipe, the inner wall of the shell and the two side walls of the plate pipe are subjected to anticorrosive spraying treatment, so that the integral anticorrosive performance of the heat exchanger can be ensured, and the integral anticorrosive effect of the heat exchanger can be further improved by arranging the outer lining layer.
The spraying layer is sprayed only at the position of the heat exchange chamber of the inner wall of the shell, and the outer lining layer is also arranged only at the position of the heat exchange chamber of the inner wall of the shell.
The pressure reducer comprises an air inlet end and an air outlet end, the air outlet end of the pressure reducer is connected to an air inlet of the shell of the heat exchanger, and the discharged flue gas enters from the flue gas inlet pipe, is heated by the heat exchanger and then is discharged into a chimney through the flue gas outlet pipe; unsaturated steam (160 ℃, 0.7MPa, 2.3t/h) enters the gas inlet end of the pressure reducer, and saturated steam (160 ℃) is discharged from the gas outlet end of the pressure reducer; the temperature of the flue gas entering the flue gas inlet pipe is 60 ℃, and the temperature of the flue gas discharged after being heated by the heat exchanger is 120 ℃.
The invention is further configured to: the anticorrosive spraying treatment comprises the following steps:
respectively carrying out surface sand blasting treatment on the outer wall of the heat exchange tube, the inner wall of the shell and two side walls of the plate tube by adopting an airless sand blasting mode, and carrying out phosphating passivation treatment on the outer wall of the heat exchange tube, the inner wall of the shell and the two side walls of the plate tube after sand blasting to form a stable phosphating film on the surface of the heat exchange tube, the inner wall of the shell and the two side walls of the plate tube;
secondly, spraying metal powder on the outer wall of the heat exchange pipe, the inner wall of the shell and the two side walls of the plate pipe subjected to sand blasting and phosphating passivation treatment in the first step in an electrostatic spraying mode, and baking, leveling and curing the coating at high temperature to form a metal powder bottom layer; wherein, the metal powder adopts 160-mesh aluminum powder, and the thickness of the bottom layer of the metal powder is 150 μm;
thirdly, spraying a corrosion-resistant layer on the surface of the bottom layer of the metal powder in the second step in an airless spraying mode;
and step four, placing the heat exchange tube, the shell and the tube plate which are sprayed with the anticorrosive layer in the step three at the temperature of 80 ℃ for drying.
The invention is further configured to: the anticorrosive layer comprises the following components in parts by mass: 250 parts of modified novolac epoxy resin base material, 150 parts of auxiliary material, 80 parts of triethylene tetramine curing agent, 15 parts of defoaming agent for epoxy resin and 20 parts of vinyl trimethoxy silane coupling agent.
By adopting the technical scheme, after the sand blasting treatment is carried out on the outer wall of the heat exchange pipe, the inner wall of the shell and the two side walls of the plate pipe, the treatment processes of phosphorization passivation and metal powder coating spraying on the surfaces of the outer wall of the heat exchange pipe, the inner wall of the shell and the two side walls of the plate pipe are added, the acid washing step after the traditional sand blasting process is avoided through the phosphorization passivation treatment, the tiny sharp corners of the surface after the sand blasting treatment can be reduced, the phenomenon that the surface of the inner wall cannot be completely covered by the metal powder bottom layer is prevented, and the continuity of the; and the metal powder bottom layer has high mechanical strength, strong adhesive force and better corrosion resistance and aging resistance, can effectively conduct static electricity generated by petrochemical medium flow, and can play a certain electrochemical protection role on the outer wall of the heat exchange pipe, the inner wall of the shell and the two side walls of the plate pipe.
The anti-corrosion layer is a functional coating layer of a heavy anti-corrosion system taking epoxy resin as a film forming medium, has the advantages of low curing temperature, stable film forming and the like, effectively solves the problem of poor anti-corrosion performance caused by weak interaction among coatings, and greatly improves the anti-corrosion performance of the composite anti-corrosion structure system; and because the coupling agent is added during the preparation of each paint layer, the coupling agent can react with certain groups on the surface of the reinforced material and also react with the matrix resin, an interface layer is formed between the reinforced material and the resin matrix, and the interface layer can transfer stress, so that the adhesion degree between the reinforced material and the resin is enhanced, the performance of the composite material is improved, and other media can be prevented from permeating into the interface.
The invention is further configured to: the auxiliary materials comprise barium nitrate, calcium nitrate, aluminum nitrate, sodium hydroxide, sodium carbonate, a silane coupling agent, nano silicon dioxide and superfine mica powder.
The invention is further configured to: the preparation steps of the auxiliary materials comprise:
(1) mixing barium nitrate, calcium nitrate, aluminum nitrate, sodium hydroxide, sodium carbonate and distilled water to prepare a solution, violently stirring for 4-5 hours by using a magnetic stirrer, then carrying out suction filtration, washing and drying to obtain a mixture, wherein the mixture is hydrotalcite-like;
(2) mixing the obtained mixture with nano silicon dioxide, superfine mica powder and a silane coupling agent, performing ultrasonic dispersion, drying, grinding, sieving with a 200-mesh sieve, and calcining at 550 ℃ for 3-4 hours to obtain the auxiliary material;
the raw materials in the step (1) are mixed according to the following molar ratio: barium nitrate: calcium nitrate: aluminum nitrate: sodium hydroxide: sodium carbonate 30: 6: 15: 180: 90, respectively;
the raw materials in the step (2) are in parts by weight: 100 parts of mixture, 10 parts of silane coupling agent, 150 parts of nano silicon dioxide and 15 parts of superfine mica powder.
The invention is further configured to: the whiteness of the superfine mica powder is more than 70, and the average particle size is less than 35 um.
The invention is further configured to: the nano silicon dioxide is hydrophilic nano silicon dioxide, and the average particle size is less than 30 nm.
The invention is further configured to: the molar concentration of the barium nitrate is 0.1-0.5 mol/L, and the volume of the solution is 0.5-1L.
The silane coupling agent is KH-560, KH-570 and KH-792.
By adopting the technical scheme, the auxiliary materials are doped with barium ions to fix the sulfate ions permeated in. Because the hydrotalcite-like compound is a layered metal hydroxide, anions between layers can be exchanged (the exchange capacity of sulfate ions is greater than that of nitrate ions); when sulfate ions permeate into the anticorrosive layer, the sulfate ions can enter the layered hydrotalcite structure through anion exchange; the introduction of metal barium ions into hydrotalcite can more firmly fix sulfate ions by generating barium sulfate precipitates.
Therefore, the sulfate ions can be prevented from diffusing in the coating layer by seeping into the anticorrosive coating, and the intruding sulfate ions can be adsorbed and fixed, so that the generation of related sulfate corrosive products can be prevented.
The anion adsorption capacity of the hydrotalcite-like compound is improved by calcining the hydrotalcite-like compound, the calcined hydrotalcite-like compound has a structure memory effect, the interlayer distance can be increased in the water environment, and the adsorption of the anti-corrosion layer on sulfate ions is further increased. Meanwhile, the added nano silicon dioxide has a volcanic ash effect, so that the hydration of the cementing material is accelerated, and the early strength of the anticorrosive coating is improved. Wherein, the mica powder is used as a layered silicate mineral, has good water-retaining property and can prevent the cracking of the anticorrosive coating to a certain extent; in addition, the compactness of the coating can be improved by matching the micro particle size of the nano silicon dioxide, and the nano silicon dioxide plays a positive role in preventing the diffusion of sulfate ions. The silane coupling agent is doped to modify the hydrotalcite-like compound, so that the dispersibility of the hydrotalcite-like compound and the nano silicon dioxide in the anticorrosive layer is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the heat exchanger according to the present invention;
FIG. 3 is a schematic view of the structure of the sprayed layer in the present invention;
reference numbers in the drawings and corresponding part names: 1-pressure reducer, 2-heat exchanger, 2 a-shell, 2 b-air inlet, 2 c-water outlet, 2 d-tube plate, 2 e-heat exchange chamber, 2 f-heat exchange tube, 2 g-flue gas inlet tube, 2h flue gas outlet tube, 3-chimney, 4-spray coating, 4 a-phosphating coating, 4 b-metal powder bottom layer, 4 c-anticorrosive coating and 5-outer lining layer.
Detailed Description
One embodiment of the present invention is further explained with reference to fig. 1 to 3.
A fluorine-lined pipe flue gas heating system comprises a pressure reducer 1, a heat exchanger 2 and a chimney 3, wherein the heat exchanger 2 comprises a shell 2a, the upper end and the lower end of the shell 2a are respectively provided with an air inlet 2b and a water outlet 2c, the upper end and the lower end in the shell 2a are respectively provided with a pipe plate 2d, a heat exchange chamber 2e is formed between the two pipe plates 2d, a plurality of heat exchange pipes 2f are inserted between the two pipe plates 2d, and the side wall of the shell 2a is provided with a flue gas inlet pipe 2g and a flue gas outlet pipe 2h which are communicated with the heat exchange chamber 2 e; heat exchange tube 2f, casing 2a and tube sheet 2d make by the carbon steel, just heat exchange tube 2f outer wall, casing 2a inner wall and board pipe both sides wall all form spraying layer 4 through anticorrosive spraying treatment, and through anticorrosive spraying treatment heat exchange tube 2f outer wall, casing 2a inner wall and board pipe both sides wall all are provided with outer lining 5, outer lining 5 make by fluoroplastics.
By adopting the technical scheme, the outer wall of the heat pipe, the inner wall of the shell 2a and the two side walls of the plate pipe are subjected to anticorrosive spraying treatment, so that the integral anticorrosive performance of the heat exchanger 2 can be ensured, and the integral anticorrosive effect of the heat exchanger 2 can be further improved by arranging the outer lining layer 5.
The sprayed layer 4 is sprayed only at the location of the heat exchange chamber 2e of the inner wall of the casing 2a, and the outer lining layer 5 is also provided only at the location of the heat exchange chamber 2e of the inner wall of the casing 2 a.
The pressure reducer 1 comprises an air inlet end and an air outlet end, the air outlet end of the pressure reducer 1 is connected to an air inlet 2b of a shell 2a of the heat exchanger 2, and the discharged flue gas enters from a flue gas inlet pipe 2g, is heated by the heat exchanger 2 and then is discharged into a chimney 3 from a flue gas outlet pipe; unsaturated steam (160 ℃, 0.7MPa, 2.3t/h) enters the gas inlet end of the pressure reducer 1, and saturated steam (160 ℃) is discharged from the gas outlet end of the pressure reducer 1; the temperature of the flue gas entering the flue gas inlet pipe 2g is 60 ℃, and the temperature of the flue gas discharged after being heated by the heat exchanger 2 is 120 ℃.
The anticorrosive spraying treatment comprises the following steps:
firstly, respectively carrying out surface sand blasting treatment on the outer wall of the heat exchange tube 2f, the inner wall of the shell 2a and two side walls of the plate tube by adopting an airless sand blasting mode, and carrying out phosphating passivation treatment on the outer wall of the heat exchange tube 2f, the inner wall of the shell 2a and the two side walls of the plate tube after sand blasting to form a stable phosphating film 4a on the surface of the heat exchange tube 2 f;
secondly, spraying metal powder on the outer wall of the heat exchange tube 2f, the inner wall of the shell 2a and the two side walls of the plate tube which are subjected to sand blasting and phosphating passivation treatment in the first step in an electrostatic spraying mode, and baking, leveling and curing the coating at high temperature to form a metal powder bottom layer 4 b; wherein, the metal powder adopts 160-mesh aluminum powder, and the thickness of the metal powder bottom layer 4b is 150 μm;
thirdly, spraying a corrosion-resistant layer on the surface of the metal powder bottom layer 4b in the second step in an airless spraying mode;
and step four, drying the heat exchange tube 2f, the shell 2a and the tube plate 2d which are sprayed with the anticorrosive layer in the step three at the temperature of 80 ℃.
The anticorrosive layer comprises the following components in parts by mass: 250 parts of modified novolac epoxy resin base material, 150 parts of auxiliary material, 80 parts of triethylene tetramine curing agent, 15 parts of defoaming agent for epoxy resin and 20 parts of vinyl trimethoxy silane coupling agent.
After the sand blasting treatment is carried out on the outer wall of the heat exchange pipe 2f, the inner wall of the shell 2a and the two side walls of the plate pipe, the treatment processes of phosphorization passivation and metal powder coating spraying on the surfaces of the outer wall of the heat exchange pipe 2f, the inner wall of the shell 2a and the two side walls of the plate pipe are added, the acid washing step after the traditional sand blasting process is avoided through the phosphorization passivation treatment, the tiny sharp corners on the surface after the sand blasting treatment can be reduced, the phenomenon that the surface of the inner wall cannot be completely covered by the metal powder bottom layer 4b is prevented, and the continuity of the metal powder; and the metal powder bottom layer 4b has high mechanical strength, strong adhesive force and better corrosion resistance and aging resistance, can effectively conduct static electricity generated by petrochemical medium flow, and can play a certain electrochemical protection role on the outer wall of the heat exchange tube 2f, the inner wall of the shell 2a and the two side walls of the plate tube.
The anticorrosive layer 4c is a functional coating layer of a heavy anticorrosive system taking epoxy resin as a film forming medium, has the advantages of low curing temperature, stable film forming and the like, effectively solves the problem of poor anticorrosive performance caused by weak interaction among the coatings, and greatly improves the anticorrosive performance of the composite anticorrosive structure system; and because the coupling agent is added during the preparation of each paint layer, the coupling agent can react with certain groups on the surface of the reinforced material and also react with the matrix resin, an interface layer is formed between the reinforced material and the resin matrix, and the interface layer can transfer stress, so that the adhesion degree between the reinforced material and the resin is enhanced, the performance of the composite material is improved, and other media can be prevented from permeating into the interface.
The auxiliary materials comprise barium nitrate, calcium nitrate, aluminum nitrate, sodium hydroxide, sodium carbonate, a silane coupling agent, nano silicon dioxide and superfine mica powder.
: the preparation steps of the auxiliary materials comprise:
(1) mixing barium nitrate, calcium nitrate, aluminum nitrate, sodium hydroxide, sodium carbonate and distilled water to prepare a solution, violently stirring for 4-5 hours by using a magnetic stirrer, then carrying out suction filtration, washing and drying to obtain a mixture, wherein the mixture is hydrotalcite-like;
(2) mixing the obtained mixture with nano silicon dioxide, superfine mica powder and a silane coupling agent, performing ultrasonic dispersion, drying, grinding, sieving with a 200-mesh sieve, and calcining at 550 ℃ for 3-4 hours to obtain the auxiliary material;
the raw materials in the step (1) are mixed according to the following molar ratio: barium nitrate: calcium nitrate: aluminum nitrate: sodium hydroxide: sodium carbonate 30: 6: 15: 180: 90, respectively;
the raw materials in the step (2) are in parts by weight: 100 parts of mixture, 10 parts of silane coupling agent, 150 parts of nano silicon dioxide and 15 parts of superfine mica powder.
The invention is further configured to: the whiteness of the superfine mica powder is more than 70, and the average particle size is less than 35 um.
The invention is further configured to: the nano silicon dioxide is hydrophilic nano silicon dioxide, and the average particle size is less than 30 nm.
The molar concentration of the barium nitrate is 0.1-0.5 mol/L, and the volume of the solution is 0.5-1L.
The silane coupling agent is KH-560, KH-570 and KH-792.
By adopting the technical scheme, the auxiliary materials are doped with barium ions to fix the sulfate ions permeated in. Because the hydrotalcite-like compound is a layered metal hydroxide, anions between layers can be exchanged (the exchange capacity of sulfate ions is greater than that of nitrate ions); when sulfate ions permeate into the anticorrosive layer, the sulfate ions can enter the layered hydrotalcite structure through anion exchange; the introduction of metal barium ions into hydrotalcite can more firmly fix sulfate ions by generating barium sulfate precipitates.
Therefore, the sulfate ions can be prevented from diffusing in the coating layer by seeping into the anticorrosive coating, and the intruding sulfate ions can be adsorbed and fixed, so that the generation of related sulfate corrosive products can be prevented.
The anion adsorption capacity of the hydrotalcite-like compound is improved by calcining the hydrotalcite-like compound, the calcined hydrotalcite-like compound has a structure memory effect, the interlayer distance can be increased in the water environment, and the adsorption of the anti-corrosion layer on sulfate ions is further increased. Meanwhile, the added nano silicon dioxide has a volcanic ash effect, so that the hydration of the cementing material is accelerated, and the early strength of the anticorrosive coating is improved. Wherein, the mica powder is used as a layered silicate mineral, has good water-retaining property and can prevent the cracking of the anticorrosive coating to a certain extent; in addition, the compactness of the coating can be improved by matching the micro particle size of the nano silicon dioxide, and the nano silicon dioxide plays a positive role in preventing the diffusion of sulfate ions. The silane coupling agent is doped to modify the hydrotalcite-like compound, so that the dispersibility of the hydrotalcite-like compound and the nano silicon dioxide in the anticorrosive layer is improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The utility model provides a lining fluorine pipe flue gas heating system, including pressure reducer (1), heat exchanger (2) and chimney (3), heat exchanger (2) are including casing (2a), air inlet (2b) and outlet (2c) have been seted up respectively to the upper and lower both ends of casing (2a), upper and lower both ends setting in casing (2a) has tube sheet (2d) respectively, form heat transfer room (2e) between two tube sheet (2d), and insert between two tube sheet (2d) and be equipped with a plurality of heat exchange tubes (2f), the lateral wall of casing (2a) is provided with and advances pipe (2g) and flue gas exit tube (2h) with the flue gas of heat transfer room (2e) intercommunication, characterized by: heat exchange tube (2f), casing (2a) and tube sheet (2d) make by the carbon steel, just heat exchange tube (2f) outer wall, casing (2a) inner wall and tube sheet (2d) both sides wall all form spraying layer (4) through anticorrosive spraying processing, and through anticorrosive spraying processing heat exchange tube (2f) outer wall, casing (2a) inner wall and tube sheet (2d) both sides wall all are provided with an outer lining (5) of one deck, outer lining (5) make by fluoroplastics.
2. The fluorine lined pipe flue gas heating system as set forth in claim 1, wherein the step of the anticorrosive spraying treatment comprises:
firstly, respectively carrying out surface sand blasting treatment on the outer wall of the heat exchange tube (2f), the inner wall of the shell (2a) and two side walls of the tube plate (2d) in an airless sand blasting manner, and carrying out phosphating passivation treatment on the outer wall of the sand-blasted heat exchange tube (2f), the inner wall of the shell (2a) and two side walls of the tube plate (2d) to form a stable phosphating film (4a) on the surface;
secondly, spraying metal powder on the outer wall of the heat exchange tube (2f), the inner wall of the shell (2a) and the two side walls of the tube plate (2d) which are subjected to sand blasting and phosphating passivation treatment in the first step in an electrostatic spraying mode, and baking, leveling and curing the coating at high temperature to form a metal powder bottom layer (4 b); wherein, the metal powder adopts 160-mesh aluminum powder, and the thickness of the metal powder spray bottom layer is 150 μm;
thirdly, spraying a corrosion-resistant layer (4c) on the surface of the metal powder bottom layer (4b) in the second step in an airless spraying mode;
and step four, placing the heat exchange tube (2f) sprayed with the anticorrosive layer (4c) in the step three, the shell (2a) and the tube plate (2d) at the temperature of 80 ℃ for drying.
3. The fluorine lined pipe flue gas heating system of claim 2, wherein: the anticorrosive layer (4c) comprises the following components in parts by mass: 250 parts of modified novolac epoxy resin base material, 150 parts of auxiliary material, 80 parts of triethylene tetramine curing agent, 15 parts of defoaming agent for epoxy resin and 20 parts of vinyl trimethoxy silane coupling agent.
4. The fluorine-lined pipe flue gas heating system as claimed in claim 3, wherein the auxiliary materials comprise barium nitrate, calcium nitrate, aluminum nitrate, sodium hydroxide, sodium carbonate, silane coupling agent, nano silica and ultrafine mica powder.
5. The fluorine lined pipe flue gas heating system as set forth in claim 4, wherein the preparation of said auxiliary materials comprises:
(1) mixing barium nitrate, calcium nitrate, aluminum nitrate, sodium hydroxide, sodium carbonate and distilled water to prepare a solution, violently stirring for 4-5 hours by using a magnetic stirrer, then carrying out suction filtration, washing and drying to obtain a mixture;
(2) mixing the obtained mixture with nano silicon dioxide, superfine mica powder and a silane coupling agent, performing ultrasonic dispersion, drying, grinding, sieving with a 200-mesh sieve, and calcining at 550 ℃ for 4 hours to obtain the auxiliary material;
the raw materials in the step (1) are mixed according to the following molar ratio: barium nitrate: calcium nitrate: aluminum nitrate: sodium hydroxide: sodium carbonate 30: 10: 15: 180: 90, respectively;
the raw materials in the step (2) are in parts by weight: 100 parts of mixture, 10 parts of silane coupling agent, 150 parts of nano silicon dioxide and 15 parts of superfine mica powder.
6. The fluorine lined pipe flue gas heating system as claimed in claim 5, wherein the superfine mica powder has a whiteness of more than 70 and an average particle size of less than 35 um.
7. The fluorine lined pipe flue gas heating system as claimed in claim 5, wherein said nano silica is hydrophilic nano silica having an average particle size of less than 30 nm.
8. The fluorine-lined pipe flue gas heating system as claimed in claim 5, wherein the molar concentration of barium nitrate is 0.1-0.5 mol/L, and the volume of the solution is 0.5-1L.
9. The fluorine-lined pipe flue gas heating system according to claim 5, wherein the silane coupling agent is KH-792 silane coupling agent.
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