CN117363064B - Graphene composite coating for flue gas condensation type waste heat boiler and preparation method - Google Patents
Graphene composite coating for flue gas condensation type waste heat boiler and preparation method Download PDFInfo
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- CN117363064B CN117363064B CN202311325631.6A CN202311325631A CN117363064B CN 117363064 B CN117363064 B CN 117363064B CN 202311325631 A CN202311325631 A CN 202311325631A CN 117363064 B CN117363064 B CN 117363064B
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- 238000000576 coating method Methods 0.000 title claims abstract description 60
- 239000011248 coating agent Substances 0.000 title claims abstract description 58
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000003546 flue gas Substances 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 239000002918 waste heat Substances 0.000 title claims abstract description 35
- 238000009833 condensation Methods 0.000 title claims abstract description 30
- 230000005494 condensation Effects 0.000 title claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 33
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 30
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 22
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229960000583 acetic acid Drugs 0.000 claims abstract description 11
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 11
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 11
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 11
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 11
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 11
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 10
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 claims abstract description 10
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims abstract description 10
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims abstract description 10
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims abstract description 10
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 10
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004111 Potassium silicate Substances 0.000 claims abstract description 9
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 9
- 239000013530 defoamer Substances 0.000 claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- 239000000839 emulsion Substances 0.000 claims abstract description 9
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052912 lithium silicate Inorganic materials 0.000 claims abstract description 9
- 239000010445 mica Substances 0.000 claims abstract description 9
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 9
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 9
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 9
- 229910052913 potassium silicate Inorganic materials 0.000 claims abstract description 9
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 9
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims abstract description 9
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 9
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 9
- 239000003973 paint Substances 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 4
- 238000003760 magnetic stirring Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims 3
- 238000004939 coking Methods 0.000 abstract description 25
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000779 smoke Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- DSIKRWUTLWJWBK-UHFFFAOYSA-N [O].O1C=COC=C1 Chemical compound [O].O1C=COC=C1 DSIKRWUTLWJWBK-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
- C09D1/04—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates with organic additives
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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
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- 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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- 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
- C09D7/63—Additives non-macromolecular organic
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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
- C09D7/65—Additives macromolecular
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a graphene composite coating for a flue gas condensation type waste heat boiler and a preparation method thereof, relates to the technical field of coking prevention of flue gas condensation type waste heat boilers, and aims to solve the problem of coking of the flue gas condensation type waste heat boiler; the first part of the composite coating consists of the following components: gamma-activated alumina, citric acid, nickel sulfate, oxalic acid, glacial acetic acid, sodium hexametaphosphate, zinc phosphate and acrylic acid, wherein the second part consists of the following components: silica sol, potassium silicate, lithium silicate, styrene-acrylic emulsion, polytetrafluoroethylene, graphene, beryllium oxide, silicon carbide, nano silicon dioxide, nano titanium dioxide, defoamer, dispersant, silane coupling agent kh-556, mica and calcium carbonate, wherein the first part is dried and then coated with the second part; the invention can form a layer of anti-coking film on the inner wall of the waste heat boiler, reduces the adhesiveness of combustion products to the inner wall of the boiler to reduce coking, is beneficial to ensuring the normal operation of the waste heat boiler, and is beneficial to improving the heat recovery efficiency and reducing the cost.
Description
Technical Field
The invention relates to the technical field of flue gas condensation type waste heat boiler coking prevention, in particular to a graphene composite coating for a flue gas condensation type waste heat boiler and a preparation method thereof.
Background
Coking of a flue gas condensation type waste heat boiler is a big problem which disturbs production and operation of a garbage power plant, more serious problems are caused by coking, different influences are caused by coking at different positions, for example, a vertical flue can lead to narrowing of the flue, negative pressure of an outlet is increased, power consumption of a fan is increased, and the temperature of discharged smoke is increased to lead to furnace shutdown; the dropping of the coking block can be blocked at the slag discharging port or the slag dragging machine is blocked to influence normal slag discharging; coking on the inner side wall and the front and rear arches can affect stacking and spreading or even deflection to affect combustion.
The coking reasons of the waste heat boiler of the garbage power plant mainly include: the ash removal problem of a flue heating surface, the influence of boiler air distribution, the unreasonable temperature of a hearth, unreasonable combustion and the like. Ash after high temperature melting in the boiler contacts a heating surface and adheres to the heating surface, accumulated ash is formed for a long time, and finally coking is formed, so that malignant circulation seriously affects production. Therefore, there is a need for a graphene composite coating for flue gas condensing type waste heat boilers and a preparation method thereof to solve the problem.
Disclosure of Invention
The invention aims to provide a graphene composite coating for a flue gas condensation type waste heat boiler and a preparation method thereof, so as to solve the coking problem of the flue gas condensation type waste heat boiler.
In order to achieve the above purpose, the present invention provides the following technical solutions: the graphene composite coating for the flue gas condensation type waste heat boiler comprises the following specific components in parts by weight: 2-8 parts of gamma-activated alumina, 1-3 parts of citric acid, 3-7 parts of nickel sulfate, 2-5 parts of oxalic acid, 1-4 parts of glacial acetic acid, 2-6 parts of sodium hexametaphosphate, 2-5 parts of zinc phosphate and 1-5 parts of acrylic acid; 20-36 parts of silica sol, 5-20 parts of potassium silicate, 5-20 parts of lithium silicate, 2-8 parts of styrene-acrylic emulsion, 1-5 parts of polytetrafluoroethylene, 2-10 parts of graphene, 1-6 parts of beryllium oxide, 15-25 parts of silicon carbide, 0.5-2 parts of nano silicon dioxide, 0.5-3 parts of nano titanium dioxide, 1-3 parts of defoamer, 1-3 parts of dispersing agent, 1-556,3-8 parts of silane coupling agent kh, 2-6 parts of mica and 0.1-2 parts of calcium carbonate.
Preferably, the components of the composite coating are respectively prepared and used in two parts, wherein the first part is gamma-activated alumina, citric acid, nickel sulfate, oxalic acid, glacial acetic acid, sodium hexametaphosphate, zinc phosphate and acrylic acid, and the rest is the second part, the two parts are not contacted before use, and the second part is coated after the first part to be coated is dried during use.
Preferably, the viscosity of the composite coating is 1000-2000 mPa.S, the pH is 7.0-8.5, the adhesive force is 0 level, the hardness is 7H, the friction corner of the iron rod is 5000 times without exposing the bottom, and the neutral salt fog test is more than 1000 hours; the temperature resistance can meet the requirement of working in 500 ℃ environment for a long time and working in 1200 ℃ environment instantaneously.
The preparation method of the composite coating comprises the following specific steps:
preparing an A-type coating: weighing 2-8 parts of gamma-activated alumina, 1-3 parts of citric acid, 3-7 parts of nickel sulfate, 2-5 parts of oxalic acid, 1-4 parts of glacial acetic acid, 2-6 parts of sodium hexametaphosphate, 2-5 parts of zinc phosphate and 1-5 parts of acrylic acid according to parts by weight, adding the mixture into 100 parts of water, heating to 60-90 ℃, and fully stirring at a maintained temperature;
preparing a B-type intermediate: weighing 20-36 parts of silica sol, 5-20 parts of potassium silicate, 5-20 parts of lithium silicate and 2-8 parts of styrene-acrylic emulsion according to parts by weight, adding into 100 parts of water, heating to 40-60 ℃, and fully stirring at a maintained temperature;
Preparing C-type paint: weighing 1-5 parts of polytetrafluoroethylene, 2-10 parts of graphene, 1-6 parts of beryllium oxide, 15-25 parts of silicon carbide, 0.5-2 parts of nano silicon dioxide, 0.5-3 parts of nano titanium dioxide, 1-3 parts of defoamer, 1-3 parts of dispersing agent, kh-556,3-8 parts of silane coupling agent, 2-6 parts of mica and 0.1-2 parts of calcium carbonate, adding the B-type intermediate material, uniformly dispersing by ultrasonic waves, and standing for 24 hours for later use;
and directly coating the A-type coating on the surface of a condensing type waste heat boiler, and after the A-type coating is dried, coating the C-type coating on the surface of the A-type coating and drying.
Preferably, in the preparation process of the type A coating, 150-300W magnetic stirring is adopted for stirring for 1 hour.
Preferably, in the preparation process of the type B intermediate material, stirring is carried out at a speed of 3000 rpm for 30-40 minutes, and then at a speed of 600-900 rpm for 10-60 minutes.
Preferably, the ultrasonic time is 30-60 minutes in the preparation process of the C-type coating.
Preferably, the A-type paint is dried for 2-4 hours after being sprayed, then the C-type paint is sprayed, and the C-type paint is dried for 24-48 hours after being sprayed.
Compared with the prior art, the invention has the beneficial effects that:
1. The graphene composite coating for the flue gas condensation type waste heat boiler utilizes a special organic-inorganic mixture material to form an anti-coking film on the inner wall of the flue gas condensation type waste heat boiler, so that the adhesiveness of combustion products to the inner wall of the boiler is reduced, and the coking is reduced.
2. This a graphite alkene composite coating for flue gas condensation type exhaust-heat boiler scribbles flue gas condensation type exhaust-heat boiler surface, can improve its surface heat conduction ability for heat energy transfer rate, can also reduce flue gas condensation type exhaust-heat boiler's surface temperature fluctuation, helps improving equipment operation stability, is favorable to improving flue gas condensation type exhaust-heat boiler's chemical stability after scribbling the boiler surface, is favorable to prolonging reliability and life of equipment.
3. According to the graphene composite coating for the flue gas condensation type waste heat boiler, coking is reduced, so that the original design performance of equipment is guaranteed, and the heat energy recovery efficiency of the flue gas condensation type waste heat boiler can be improved; in addition, after the composite coating is adopted, dirt and corrosion on the surface of the flue gas waste heat boiler can be reduced, the frequency of cleaning the inner wall of the boiler can be reduced only by one-time investment, the cleaning and maintenance cost is reduced, and meanwhile, the reduction of the frequency of blowing out is beneficial to improving the working efficiency of the boiler.
4. The preparation method of the graphene composite coating for the flue gas condensation type waste heat boiler has the advantages of simple steps, easy operation, environment-friendly and pollution-free process, no need of special processing equipment and lower preparation cost.
Detailed Description
Flue gas condensing type waste heat boilers are very common devices in a plurality of industries, which transfer heat energy in flue gas to water through a heat exchanger to heat the water into steam or hot water. In the process of transferring heat energy in the flue gas to water, the temperature of the flue gas is reduced, and the water temperature is increased, so that the heat energy is recycled, the method is widely applied to industries such as steel, electric power, chemical industry and the like, and can effectively recycle the heat energy of waste gas and convert the heat energy into useful heat energy for production in a high-temperature kiln and a high-temperature flue gas production process, however, due to the existence of high-temperature combustion, the flue gas condensation type waste heat boiler is easy to generate coking phenomenon, so that the temperature in the boiler is increased, and the normal operation of the boiler is influenced; in order to ensure the stable operation of the flue gas condensation type waste heat boiler and further solve the coking problem, the invention provides the graphene composite coating for the flue gas condensation type waste heat boiler;
The composite coating comprises the following specific components in parts by weight: 2-8 parts of gamma-activated alumina, 1-3 parts of citric acid, 3-7 parts of nickel sulfate, 2-5 parts of oxalic acid, 1-4 parts of glacial acetic acid, 2-6 parts of sodium hexametaphosphate, 2-5 parts of zinc phosphate and 1-5 parts of acrylic acid; 20-36 parts of silica sol, 5-20 parts of potassium silicate, 5-20 parts of lithium silicate, 2-8 parts of styrene-acrylic emulsion, 1-5 parts of polytetrafluoroethylene, 2-10 parts of graphene, 1-6 parts of beryllium oxide, 15-25 parts of silicon carbide, 0.5-2 parts of nano silicon dioxide, 0.5-3 parts of nano titanium dioxide, 1-3 parts of defoamer, 1-3 parts of dispersing agent, 1-556,3-8 parts of silane coupling agent kh, 2-6 parts of mica and 0.1-2 parts of calcium carbonate.
The preparation method of the composite coating comprises the following specific steps:
Preparing an A-type coating: weighing 2-8 parts of gamma-activated alumina, 1-3 parts of citric acid, 3-7 parts of nickel sulfate, 2-5 parts of oxalic acid, 1-4 parts of glacial acetic acid, 2-6 parts of sodium hexametaphosphate, 2-5 parts of zinc phosphate and 1-5 parts of acrylic acid according to parts by weight, adding the mixture into 100 parts of water, heating to 60-90 ℃, and fully stirring at a maintained temperature, wherein 150-300W magnetic stirring can be adopted for 1 hour;
Preparing a B-type intermediate: weighing 20-36 parts by weight of silica sol, 5-20 parts by weight of potassium silicate, 5-20 parts by weight of lithium silicate and 2-8 parts by weight of styrene-acrylic emulsion, adding into 100 parts by weight of water, heating to 40-60 ℃, and fully stirring at a maintained temperature, wherein the stirring can be referred to, firstly, stirring for 30-40 minutes at a speed of 3000 rpm, and then stirring for 10-60 minutes at a speed of 600-900 rpm;
Preparing C-type paint: weighing 1-5 parts of polytetrafluoroethylene, 2-10 parts of graphene, 1-6 parts of beryllium oxide, 15-25 parts of silicon carbide, 0.5-2 parts of nano silicon dioxide, 0.5-3 parts of nano titanium dioxide, 1-3 parts of defoamer, 1-3 parts of dispersing agent, kh-556,3-8 parts of silane coupling agent, 2-6 parts of mica and 0.1-2 parts of calcium carbonate, adding a B-type intermediate material, uniformly dispersing by ultrasonic waves (for example, 30-60 minutes), and standing for 24 hours for later use;
the A-type paint is directly coated on the surface of a condensing type waste heat boiler, the A-type paint is dried (the A-type paint can be dried for 2 to 4 hours generally), and the C-type paint is coated on the surface of the A-type paint and dried (the A-type paint can be dried for 24 to 48 hours generally).
In the composite coating, the graphene has super heat conduction 5300w/m.k, the emissivity is more than 0.95, and the composite coating has high strength and good corrosion resistance. The electron mobility of the material is up to 2X 105cm 2/(V.s), the Young modulus is up to 1TPa, the surface area is up to 2630m 2/g, the heat stability is excellent, the hydrophobicity is strong, the radiation cooling is realized, and meanwhile, the material also has good self-cleaning property, corrosion resistance, water resistance, fire resistance and acid and alkali resistance; the silicon carbide-beryllium oxide has super heat conductivity of 270w/m.k, is a light and high-strength high-heat-conductivity material, and can be used for increasing the corrosion resistance and super heat conductivity of a pipeline in a flue gas condensation type waste heat boiler; oxalic acid, glacial acetic acid, sodium hexametaphosphate acrylic acid and steel base surfaces can play a role in phosphating in the temperature change, particularly at 150-600 ℃, and rust can be converted into a rust-proof film.
Through testing, the composite coating prepared by the method has excellent adhesive force, higher hardness and good wear resistance and corrosion resistance; the paint can stably work in 500 ℃ environment for a long time, can stably work in 600-700 ℃ environment in continuous limiting time, and can not influence the paint even when the instantaneous temperature reaches 1200 ℃; other specific test results are shown in the following table:
Table 1: composite coating performance detection result
In addition, to further test the composite coating properties, we also conducted more stringent conditions of the experiment, the experimental conditions and results are as follows:
30% of sulfuric acid, good resistance,
Nitric acid 10 percent, has good resistance,
10 To 50 percent of sodium hydroxide, good resistance,
50% Of copper sulfate aqueous solution, good resistance,
Sulfur dioxide, has good resistance,
26% Of saline solution, good resistance,
36% Of hydrochloric acid, good resistance, 136 degrees of hydrophobic angle and good resistance to hydrogen chloride.
The corrosion resistance of the composite coating is 1-3 times longer than that of other similar coatings in the market, and the cost is less than one fifth of that of other coatings.
A large number of experimental tests show that the composite coating has excellent high temperature resistance, can bear a high-temperature combustion environment, and does not deform or fall off; the anti-coking performance is excellent, and the coking incidence rate can be effectively reduced; also has excellent corrosion resistance and better resistance to acid and alkaline environments.
Example 1:
Preparing composite paint according to the method in the embodiment, and coating the composite paint on the surface of a flue gas contact part of a flue gas condensation type waste heat boiler of a certain garbage power plant, wherein the thickness of the paint is 50 mu m; wherein 2 g of gamma-activated alumina, 1g of citric acid, 3g of nickel sulfate, 2 g of oxalic acid, 1g of glacial acetic acid, 2 g of sodium hexametaphosphate, 2 g of zinc phosphate and 1g of acrylic acid; 20 g of silica sol, 5g of potassium silicate, 5g of lithium silicate, 2 g of styrene-acrylic emulsion, 1g of polytetrafluoroethylene, 2 g of graphene, 1g of beryllium oxide, 15 g of silicon carbide, 0.5 g of nano silicon dioxide, 0.5 g of nano titanium dioxide, 1g of defoamer, 1g of dispersing agent, kh-556,3 g of silane coupling agent, 2 g of mica and 0.1 g of calcium carbonate.
The flue gas conditions of the garbage power plant are shown in the following table:
| Project | Unit (B) | Design value | Remarks |
| Smoke volume | Nm3/h | 40610 | Standard state, wet base and actual oxygen |
| Smoke temperature | ℃ | 950 | 850～1150℃ |
| Smoke composition | |||
| N2 | ％ | 65.12 | |
| O2 | ％ | 9.16 | |
| CO2 | ％ | 7.13 | |
| H2O | ％ | 18.59 | |
| SO2 | mg/Nm3 | 200-500 | Standard state, dry basis, 11% oxygen |
| HCl | mg/Nm3 | 200-500 | Standard state, dry basis, 11% oxygen |
| NOX | mg/Nm3 | 150-400 | Standard state, dry basis, 11% oxygen |
| Dust | mg/Nm3 | 8575 | Standard state, dry basis, 11% oxygen |
| Dioxin | ng/Nm3 | / |
By accounting, compared with the situation before the composite coating is adopted, the heat recovery rate of flue gas is improved by 23%, the heat conductivity is improved by 32%, the evaporation gas is improved by 0.64% per hour, the comprehensive cost after coating is reduced by 1.5% (including maintenance cost, heat energy conversion rate is improved and combustion cost is reduced), and the result shows that by utilizing the scheme of the invention, the problems caused by coking can be effectively reduced, the frequency of cleaning the inner wall of the boiler is reduced, the service life of the boiler is prolonged and the power generation efficiency is improved.
Example 2:
Preparing composite paint according to the method in the embodiment, and coating the composite paint on the surface of a flue gas contact part of a flue gas condensation type waste heat boiler of a certain coal-fired power plant, wherein the thickness of the paint is 200 mu m; wherein, 8 g of gamma-activated alumina, 3 g of citric acid, 7 g of nickel sulfate, 5g of oxalic acid, 4g of glacial acetic acid, 6g of sodium hexametaphosphate, 5g of zinc phosphate and 5g of acrylic acid; 36 g of silica sol, 20 g of potassium silicate, 20 g of lithium silicate, 8 g of styrene-acrylic emulsion, 5g of polytetrafluoroethylene, 10g of graphene, 6g of beryllium oxide, 25 g of silicon carbide, 2 g of nano silicon dioxide, 3 g of nano titanium dioxide, 3 g of defoamer, 3 g of dispersing agent, kh-556,8 g of silane coupling agent, 6g of mica and 2 g of calcium carbonate.
The flue gas conditions of the coal-fired power plant are shown in the following table:
| Project | Unit (B) | Design value | Remarks |
| Smoke volume | Nm3/h | 13000 | Standard state, wet base and actual oxygen |
| Smoke temperature | ℃ | 950 | 850～1150℃ |
| Smoke composition | |||
| N2 | ％ | 65.12 | |
| O2 | ％ | 9.16 | |
| CO2 | ％ | 7.13 | |
| H2O | ％ | 18.59 | |
| SO2 | mg/Nm3 | 200-500 | Standard state, dry basis, 11% oxygen |
| HCl | mg/Nm3 | 200-500 | Standard state, dry basis, 11% oxygen |
| NOX | mg/Nm3 | 150-400 | Standard state, dry basis, 11% oxygen |
| Dust | mg/Nm3 | 8575 | Standard state, dry basis, 11% oxygen |
| Dioxin | ng/Nm3 | / |
Through accounting, compared with the situation before the composite coating is adopted, the heat recovery rate of the flue gas is improved by about 25%, the heat conductivity is improved by 33%, the evaporation gas is improved by 0.68% per hour, and the comprehensive cost after coating is reduced by 1.6%.
Example 3:
Preparing composite paint according to the method in the embodiment, and coating the composite paint on the surface of a flue gas contact part of a flue gas condensation type waste heat boiler of a certain iron and steel enterprise, wherein the thickness of the paint is 100 mu m; wherein, 5 parts of gamma-activated alumina, 3 parts of citric acid, 5 parts of nickel sulfate, 3 parts of oxalic acid, 2 parts of glacial acetic acid, 4 parts of sodium hexametaphosphate, 4 parts of zinc phosphate and 2 parts of acrylic acid; 30 parts of silica sol, 10 parts of potassium silicate, 10 parts of lithium silicate, 5 parts of styrene-acrylic emulsion, 2 parts of polytetrafluoroethylene, 5 parts of graphene, 1 part of beryllium oxide, 15 parts of silicon carbide, 1 part of nano silicon dioxide, 1 part of nano titanium dioxide, 2 parts of defoamer, 2 parts of dispersant, 4 parts of silane coupling agent kh-556,5 parts of mica and 1 part of calcium carbonate.
The flue gas inlet condition of the flue gas condensation type waste heat boiler is shown in the following table:
| Project | Unit (B) | Design value | Remarks |
| Smoke volume | Nm3/h | 20081 | Standard state, wet base and actual oxygen |
| Smoke temperature | ℃ | 950 | 850～1150℃ |
| Smoke composition | |||
| N2 | ％ | 65.12 | |
| O2 | ％ | 9.16 | |
| CO2 | ％ | 7.13 | |
| H2O | ％ | 18.59 | |
| SO2 | mg/Nm3 | 200-500 | Standard state, dry basis, 11% oxygen |
| HCl | mg/Nm3 | 200-500 | Standard state, dry basis, 11% oxygen |
| NOX | mg/Nm3 | 150-400 | Standard state, dry basis, 11% oxygen |
| Dust | mg/Nm3 | 8575 | Standard state, dry basis, 11% oxygen |
| Dioxin | ng/Nm3 | / |
Through accounting, compared with the situation before the composite coating is adopted, the heat recovery rate of the flue gas is improved by 24%, the heat conductivity is improved by more than 35%, the evaporation gas is improved by 0.65% per hour, and the comprehensive cost after coating is reduced by 1.8%.
Of course, it is expected that besides the flue gas condensation type waste heat boiler, the composite coating of the invention can be applied to other coking-prone fields, for example, a cracking furnace in a refinery is one of equipment which is easy to coke, carbon deposition can block a pipeline in the cracking furnace, the temperature and the pressure in the furnace are reduced, and by applying the composite coating technology of the invention, the occurrence of coking can be reduced, and the stability and the operation efficiency of a refinery device are improved; the coking phenomenon of the blast furnace in the steel plant is easy to occur, the temperature in the blast furnace is increased due to the coking of the blast furnace, the smelting efficiency of the blast furnace is reduced, the coking of the blast furnace can be effectively reduced by applying the composite coating technology of the invention, and the efficiency and the quality of steel production are improved.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention should be defined by the claims.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Claims (5)
1. The preparation method of the graphene composite coating for the flue gas condensation type waste heat boiler is characterized by comprising the following specific steps of:
preparing an A-type coating: weighing 2-8 parts of gamma-activated alumina, 1-3 parts of citric acid, 3-7 parts of nickel sulfate, 2-5 parts of oxalic acid, 1-4 parts of glacial acetic acid, 2-6 parts of sodium hexametaphosphate, 2-5 parts of zinc phosphate and 1-5 parts of acrylic acid according to parts by weight, adding the mixture into 100 parts of water, heating to 60-90 ℃, and fully stirring at a maintained temperature;
preparing a B-type intermediate: weighing 20-36 parts of silica sol, 5-20 parts of potassium silicate, 5-20 parts of lithium silicate and 2-8 parts of styrene-acrylic emulsion according to parts by weight, adding into 100 parts of water, heating to 40-60 ℃, and fully stirring at a maintained temperature;
Preparing C-type paint: weighing 1-5 parts of polytetrafluoroethylene, 2-10 parts of graphene, 1-6 parts of beryllium oxide, 15-25 parts of silicon carbide, 0.5-2 parts of nano silicon dioxide, 0.5-3 parts of nano titanium dioxide, 1-3 parts of defoamer, 1-3 parts of dispersing agent, kh-556,3-8 parts of silane coupling agent, 2-6 parts of mica and 0.1-2 parts of calcium carbonate, adding the B-type intermediate material, uniformly dispersing by ultrasonic waves, and standing for 24 hours for later use;
and directly coating the A-type coating on the surface of a condensing type waste heat boiler, and after the A-type coating is dried, coating the C-type coating on the surface of the A-type coating and drying.
2. The method of manufacturing according to claim 1, characterized in that: in the preparation process of the A-type coating, 150-300W magnetic stirring is adopted for 1 hour.
3. The method of manufacturing according to claim 1, characterized in that: in the preparation process of the type B intermediate material, stirring is carried out for 30-40 minutes at a speed of 3000 rpm, and then stirring is carried out for 10-60 minutes at a speed of 600-900 rpm.
4. The method of manufacturing according to claim 1, characterized in that: in the preparation process of the C-type coating, the ultrasonic time is 30-60 minutes.
5. The method of manufacturing according to claim 1, characterized in that: and (3) drying the A-type paint for 2-4 hours after spraying, spraying the C-type paint, and drying the C-type paint for 24-48 hours after spraying.
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| GB1064402A (en) * | 1963-05-31 | 1967-04-05 | Artemas De Forest Holden | Refractory furnace wall coating |
| US5993974A (en) * | 1997-11-11 | 1999-11-30 | Kawasaki Steel Corporation | Porcelain-enameled steel sheets and frits for enameling |
| CN103122075A (en) * | 2013-03-19 | 2013-05-29 | 苏州格瑞丰纳米科技有限公司 | High heat-conducting thin graphene-based composite material, as well as preparation method and application thereof |
| CN105482435A (en) * | 2014-09-29 | 2016-04-13 | 中国科学院苏州纳米技术与纳米仿生研究所 | Three-dimensional-corrugated-graphene heat dissipating slurry, preparation method therefor and application of three-dimensional-corrugated-graphene heat dissipating slurry |
| CN115160835A (en) * | 2022-07-27 | 2022-10-11 | 西安热工研究院有限公司 | Micro-nano multi-scale anti-coking and anti-wear coating, composite material and preparation method thereof |
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2023
- 2023-10-13 CN CN202311325631.6A patent/CN117363064B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1064402A (en) * | 1963-05-31 | 1967-04-05 | Artemas De Forest Holden | Refractory furnace wall coating |
| US5993974A (en) * | 1997-11-11 | 1999-11-30 | Kawasaki Steel Corporation | Porcelain-enameled steel sheets and frits for enameling |
| CN103122075A (en) * | 2013-03-19 | 2013-05-29 | 苏州格瑞丰纳米科技有限公司 | High heat-conducting thin graphene-based composite material, as well as preparation method and application thereof |
| CN105482435A (en) * | 2014-09-29 | 2016-04-13 | 中国科学院苏州纳米技术与纳米仿生研究所 | Three-dimensional-corrugated-graphene heat dissipating slurry, preparation method therefor and application of three-dimensional-corrugated-graphene heat dissipating slurry |
| CN115160835A (en) * | 2022-07-27 | 2022-10-11 | 西安热工研究院有限公司 | Micro-nano multi-scale anti-coking and anti-wear coating, composite material and preparation method thereof |
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