CN113321983A - Kiln tail anti-coking coating and coating method thereof - Google Patents
Kiln tail anti-coking coating and coating method thereof Download PDFInfo
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- CN113321983A CN113321983A CN202110877997.9A CN202110877997A CN113321983A CN 113321983 A CN113321983 A CN 113321983A CN 202110877997 A CN202110877997 A CN 202110877997A CN 113321983 A CN113321983 A CN 113321983A
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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
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
- C09D161/14—Modified phenol-aldehyde condensates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/28—Chemically modified polycondensates
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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
- C09D5/18—Fireproof paints including high temperature resistant 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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- 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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
Abstract
The application relates to the field of rotary kiln anti-coking, and particularly discloses a kiln tail anti-coking coating and a coating method thereof. The kiln tail anti-coking coating comprises the following raw materials in parts by weight: 20-50 parts of boron carbide modified phenolic resin; 10-30 parts of ceramic micro powder; 5-10 parts of glass beads; 5-10 parts of talcum powder; 2-5 parts of aluminum hydroxide; the boron carbide modified phenolic resin is prepared by the following method: d1: uniformly mixing boron carbide and a silane coupling agent, adding phenolic resin, and uniformly mixing to obtain a mixture; d2: preserving the heat of the mixture at 85-95 ℃ for 3-5min to obtain boron carbide modified phenolic resin; the mass ratio of the boron carbide to the phenolic resin is 1: (5-9); the dosage of the silane coupling agent is 0.5-1% of that of the boron carbide. The preparation method has the advantages of reducing the coking at the tail of the rotary kiln and improving the anti-coking effect.
Description
Technical Field
The application relates to the field of rotary kiln anti-coking, in particular to a kiln tail anti-coking coating and a coating method thereof.
Background
With the continuous development of socioeconomic and industrial fields, the amount of hazardous waste is on the trend of increasing. Hazardous waste is very hazardous and needs to be handled centrally.
At present, the mainstream and typical hazardous waste treatment method is a hazardous waste incineration treatment process, and mainly comprises a feeding system, a rotary kiln incineration system, a waste heat utilization system, a smoke purification system and an auxiliary system. The rotary kiln is a device for carrying out high-temperature combustion on the hazardous waste, and the hazardous waste is decomposed, dried, combusted and burned out in the rotary kiln so as to be converted into furnace slag; and meanwhile, the sterilization and volume reduction of hazardous wastes are realized.
In the related technology, because the burner is arranged at the kiln head, the temperature is higher, and salt wastes with low melting points exist, formed ash slag is easy to change into molten state, and at the position close to the kiln tail, the temperature of the rotary furnace is reduced, the molten ash slag is adhered in a furnace lining, and the problem of coking at the tail of the rotary kiln is easy to occur.
Disclosure of Invention
In order to reduce the problem of coking of the kiln tail of a rotary kiln, the application provides a kiln tail anti-coking coating and a coating method thereof.
In the related art, in order to solve the problem of coking of refractory materials at the tail of a kiln, inorganic substances with high melting point are mostly used as main materials, and inorganic substances are used as binders to prepare coatings so as to reduce coking, for example, patent CN201210247677.6 adopts bauxite (40-80 parts) as a main material in an anti-coking coating formula, aluminum phosphate is used as a binder, zirconium dioxide (20-50 parts) is used as a main material of a coating in another patent cn200510018805.x, and a composition consisting of water glass (sodium silicate) and hexametaphosphate is used as an adhesive.
The inventor abandons the technical means in the related technology and develops a new method, adopts organic matters as one of the main materials of the coating, takes the organic matters as a binder at the same time, and is supplemented with other inorganic matters to prepare a novel coating to realize the anti-coking.
As is well known to those skilled in the art, the melting point of the organic material is generally low, mostly between 300 ℃ and 500 ℃, and the temperature is far lower than the use temperature of the rotary kiln 850 ℃ and 950 ℃; therefore, when designing the lining material or coating of the rotary kiln, generally, the selection of organic matters as raw materials is not considered. The inventor skillfully designs a formula, applies organic matters into a high-temperature coating, and unexpectedly realizes a good anti-coking effect.
In the experimental process, the inventor finds that the phenolic resin has better high temperature resistance and can resist the high temperature of about 1000-2000 ℃, but the heat weight loss is larger when the phenolic resin is about 500 ℃, and if the phenolic resin is applied to a kiln lining, the heat weight loss is larger when the phenolic resin is about 1000 ℃. However, the inventors have not given up the above-mentioned process, and have tried to modify the phenolic resin, and in experiments, they found that the boron carbide powder can be dispersed in the phenolic resin structure after a certain heat treatment, so as to prevent the chain breakage of the phenolic resin structure at about 500 degrees, and reduce the heat weight loss at about 500 degrees, and further assisted with the ceramic fine powder and the glass fine powder, the heat weight loss at about 500 degrees can be further reduced, so that the boron carbide powder can maintain a high retention rate at about 1000 degrees, and can play a role of continuous high temperature resistance.
In addition, the inventor abandons the adoption of inorganic matters as a binder and directly adopts phenolic resin as the binder, so that the coating can be firmly fixed on the surface of the refractory material at high temperature without falling off, and the principle is shown in the following effect part owing to the introduction of two inorganic matters of talcum powder and aluminum hydroxide in the formula.
Based on this, this application provides following technical scheme: the kiln tail anti-coking coating comprises the following raw materials in parts by weight:
20-50 parts of boron carbide modified phenolic resin;
10-30 parts of ceramic micro powder;
5-10 parts of glass beads;
5-10 parts of talcum powder;
2-5 parts of aluminum hydroxide;
the boron carbide modified phenolic resin is prepared by the following method:
d1: uniformly mixing boron carbide and a silane coupling agent, adding phenolic resin, and uniformly mixing to obtain a mixture;
d2: preserving the heat of the mixture at 85-95 ℃ for 3-5min to obtain boron carbide modified phenolic resin;
the mass ratio of the boron carbide to the phenolic resin is 1: (5-9);
the dosage of the silane coupling agent is 0.5-1% of that of the boron carbide.
By adopting the technical scheme, the boron carbide modified phenolic resin is used as the bonding main body and the coating main body, so that the high temperature of more than 1000 ℃ can be borne, the high temperature resistant service condition of the kiln tail is met, and the high temperature resistant filler is used as an auxiliary material. The boron carbide has high density and is dispersed and coupled in the phenolic resin through the silane coupling agent, so that the position of the boron carbide in the phenolic resin phase is stable, and the heat resistance of the boron carbide modified phenolic resin is ensured. Tests show that after the anti-coking coating is coated, the coking reduction rate can be greatly improved, and the anti-coking function is achieved.
The glass beads are processed from borosilicate raw materials and have good dispersion effect in an organism system. Talc is based on hydrous magnesium silicate, which is commonly used as a filler. Aluminum hydroxide is an amphoteric hydroxide that decomposes at high temperatures. The ceramic micro powder is a light nonmetal multifunctional material, mainly comprises silicon dioxide and aluminum oxide, has high heat resistance temperature and low density, and can improve the mechanical property of a coating.
In addition, the kiln tail lining of the rotary kiln is a refractory material which takes high-alumina bricks (alumina), silicon carbide bricks, chrome corundum bricks (chromium oxide) and the like as main raw materials. The inventor researches and discovers that when the kiln tail lining material of the rotary kiln is the material, the coating can have better high-temperature bonding degree with the refractory material, and the application is mainly embodied in the application of talcum powder and aluminum hydroxide.
The talcum powder has anti-sticking property, and the fluidity of the mixed coating raw materials can be effectively improved at the initial stage of adding the talcum powder, so that the aluminum hydroxide and the glass beads are dispersed into the boron carbide modified phenolic resin, and the uniformity of the mixed coating raw materials is improved; the fluidity of the mixed coating raw materials can effectively improve the coating effect of the coating. After coating, along with the rise of temperature, aluminum hydroxide is decomposed into aluminum oxide, and the flaky interlayer structure of the talcum powder is gradually infiltrated, on one hand, the talcum powder and the aluminum oxide which are close to the surface of the refractory material of the rotary kiln can form a connection point with the refractory material due to the similar properties of the talcum powder and the aluminum oxide with the refractory material, and the bonding strength of the coating and the refractory material is improved. On the other hand, the talcum powder and the alumina are uniformly distributed in the resin, so that the stable proceeding of crosslinking can be promoted, the generation of agglomeration of crosslinking points is reduced, the stability of resin crosslinking at the interface of the resin matrix and the surface of the refractory material is ensured, and the bonding strength is improved.
Further, the ceramic micro powder, the glass beads and the talcum powder are mixed in advance in silicate water solution for 5-12h and then dried at the temperature of 100-130 ℃.
By adopting the technical scheme, the silicate has a certain degree of heat preservation and insulation effects, and experiments show that the filler can further improve the coking reduction rate after being treated by the silicate, thereby improving the anti-coking effect.
Further, before mixing, the ceramic micro powder, the glass microspheres and the talcum powder are firstly insulated for 1-3min at the temperature of-20 to-4 ℃.
By adopting the technical scheme, experiments show that the coking reduction rate can be further improved, so that the anti-coking effect of the coating is improved.
Further, the incubation is carried out for 1-3min at 45-60% RH.
By adopting the technical scheme, the environmental humidity during the treatment of the ceramic micro powder, the glass micro beads and the talcum powder is controlled, so that a certain amount of water is adhered to the surfaces of the ceramic micro powder, the glass micro beads and the talcum powder. Tests show that the coking reduction rate can be further improved, so that the anti-coking effect of the coating is improved.
Further, the temperature of the aqueous silicate solution is 25-31 ℃.
By adopting the technical scheme, experiments show that the coking reduction rate can be further improved, so that the anti-coking effect of the coating is improved.
Further, the concentration of the aqueous silicate solution is 8-11% wt.
By adopting the technical scheme, experiments show that the coking reduction rate can be further improved, so that the anti-coking effect of the coating is improved.
Further, the thickness of the coating is 0.2-2 mm.
By adopting the technical scheme, experiments show that the coking reduction rate can be further improved, so that the anti-sticking effect of the coating is improved.
In a second aspect, the present application provides the following technical solutions: a coating method of a kiln tail anti-coking coating comprises the following steps:
s1: cleaning and drying the surface of the kiln tail refractory material;
s2: coating the surface of the cleaned and dried refractory material with a coating material obtained by mixing the coating raw materials, heating the kiln tail of the rotary furnace to 140-150 ℃, and preserving the heat for 12-17 min; and then heating the kiln tail to 200 ℃ and preserving the heat for at least 2h to finish curing, thereby obtaining the coating.
By adopting the technical scheme, the cured coating is obtained, and the anti-coking effect is realized.
In summary, the present application has the following beneficial effects:
1. in the application, the boron carbide modified phenolic resin, the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide are preferably adopted, and the anti-coking coating is coated, so that the coking reduction rate can be greatly improved, and the anti-coking effect is achieved.
2. The ceramic micro powder, the glass beads and the talcum powder which are pretreated by the silicate aqueous solution are preferably adopted in the application, so that the coking reduction rate can be further improved, and the anti-sticking effect of the coating is improved.
3. In the application, the ceramic micro powder, the glass beads and the talcum powder are preferably pretreated under the environment of-20 to-4 ℃ and 45 to 60 percent RH, so that the coking reduction rate can be further improved, and the anti-sticking effect of the coating is improved.
Detailed Description
Examples
Example 1: a kiln tail anti-coking coating comprises 20kg of boron carbide modified phenolic resin, 10kg of ceramic micro powder, 5kg of glass microspheres, 5kg of talcum powder and 2kg of aluminum hydroxide.
Wherein, the preparation of the boron carbide modified phenolic resin comprises the following steps:
d1: putting 2kg of boron carbide and 0.01kg of silane coupling agent kh570 into a stirrer, stirring for 1min at the temperature of 25 ℃ and the stirring speed of 600r/min, adding 18kg of phenolic resin into the stirrer, and stirring for 3min at the temperature of 25 ℃ and the stirring speed of 800r/min to obtain a mixture;
d2: and heating the mixture to 85 ℃, and preserving the heat for 5min to obtain the boron carbide modified phenolic resin.
The coating material is prepared by the following steps:
10kg of ceramic micro powder, 5kg of glass beads, 5kg of talcum powder, 2kg of aluminum hydroxide and 20kg of boron carbide modified phenolic resin are put into a stirrer and dispersed for 3min under the stirring condition of 35 ℃ and 1000r/min to obtain the coating material.
Example 2: a kiln tail anti-coking coating differing from example 1 in that:
the coating raw materials comprise 45kg of boron carbide modified phenolic resin, 28kg of ceramic micro powder, 5kg of glass microspheres, 7kg of talcum powder and 4.5kg of aluminum hydroxide.
Preparing boron carbide modified phenolic resin:
d1: putting 6kg of boron carbide and 0.06kg of silane coupling agent kh570 into a stirrer, stirring for 1min at the temperature of 25 ℃ and the stirring speed of 600r/min, adding 42kg of phenolic resin into the stirrer, and stirring for 3min at the temperature of 25 ℃ and the stirring speed of 800r/min to obtain a mixture;
d2: and heating the mixture to 92 ℃, and preserving the heat for 5min to obtain the boron carbide modified phenolic resin.
In the preparation of the coating material:
28kg of ceramic micro powder, 5kg of glass microspheres, 7kg of talcum powder, 4.5kg of aluminum hydroxide and 45kg of boron carbide modified phenolic resin are put into a stirrer and dispersed for 3min under the stirring condition of 1000r/min at 35 ℃ to obtain the coating material.
Example 3: a kiln tail anti-coking coating differing from example 1 in that:
the coating raw materials comprise 50kg of boron carbide modified phenolic resin, 30kg of ceramic micro powder, 10kg of glass microspheres, 10kg of talcum powder and 5kg of aluminum hydroxide.
Preparing boron carbide modified phenolic resin:
d1: putting 10kg of boron carbide and 0.1kg of silane coupling agent kh570 into a stirrer, stirring for 1min at the temperature of 25 ℃ and the stirring speed of 600r/min, adding 50kg of phenolic resin into the stirrer, and stirring for 3min at the temperature of 25 ℃ and the stirring speed of 800r/min to obtain a mixture;
d2: and heating the mixture to 95 ℃, and preserving the heat for 3min to obtain the boron carbide modified phenolic resin.
In the preparation of the coating material:
30kg of ceramic micro powder, 10kg of glass microspheres, 10kg of talcum powder, 5kg of aluminum hydroxide and 50kg of boron carbide modified phenolic resin are put into a stirrer and dispersed for 3min under the stirring condition of 35 ℃ and 1000r/min to obtain the coating material.
Example 4: a kiln tail anti-coking coating differing from example 2 in that:
in the preparation of the coating material:
pretreating ceramic micro powder, glass beads, talcum powder and aluminum hydroxide: putting the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide into a stirrer, and stirring for 1min at a stirring speed of 1000r/min to obtain a mixed filler; adding 3 percent of sodium silicate aqueous solution with the temperature of 45 ℃ into the mixed filler until the liquid surface of the mixed filler is not covered by the mixed filler, stirring for 2min under the stirring condition of 600r/min, then mixing and stirring for 5h under the condition of 30r/min, and finally drying for 10min in an oven with the temperature of 100 ℃ to obtain the pretreated mixed filler.
And putting the pretreated mixed filler and the boron carbide modified phenolic resin into a stirrer, and dispersing for 3min under the stirring condition of 35 ℃ and 1000r/min to obtain the coating material.
Example 5: a kiln tail anti-coking coating differing from example 4 in that:
pretreating ceramic micro powder, glass beads, talcum powder and aluminum hydroxide: adding 3 percent of sodium silicate aqueous solution with the temperature of 5 ℃ into the mixed filler until the liquid surface of the mixed filler is not covered by the mixed filler, stirring for 2min under the stirring condition of 600r/min, then mixing and stirring for 6.5h under the stirring condition of 30r/min, and finally drying for 10min in a drying oven with the temperature of 105 ℃ to obtain the pretreated mixed filler.
Example 6: a kiln tail anti-coking coating differing from example 4 in that:
the pretreatment steps of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide are as follows: adding 3 percent of sodium silicate aqueous solution with the temperature of 20 ℃ into the mixed filler until the liquid surface of the mixed filler is not higher than the mixed filler, stirring for 2min under the stirring condition of 600r/min, then mixing and stirring for 12h under the condition of 30r/min, and finally drying for 10min in an oven with the temperature of 130 ℃ to obtain the pretreated mixed filler.
Example 7: a kiln tail anti-coking coating differing from example 5 in that:
the pretreatment steps of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide are as follows: after the mixed filler is obtained, the mixed filler is placed in an environment with the temperature of minus 20 +/-1 ℃ and the RH of 10 percent for storage for 1min, then the mixed filler is taken out and put into a stirrer, and 3 percent of sodium silicate aqueous solution with the temperature of 5 ℃ is added until the mixed filler is not filled on the liquid surface.
Example 8: a kiln tail anti-coking coating differing from example 5 in that:
the pretreatment steps of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide are as follows: after the mixed filler is obtained, the mixed filler is placed in an environment with the temperature of minus 12 +/-1 ℃ and the RH of 25 percent for storage for 2min, then the mixed filler is taken out and put into a stirrer, and then the sodium silicate aqueous solution is added.
Example 9: a kiln tail anti-coking coating differing from example 5 in that:
the pretreatment steps of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide are as follows: after the mixed filler is obtained, the mixed filler is placed in an environment with the temperature of minus 4 +/-1 ℃ and the RH of 5 percent for storage for 3min, then taken out and put into a stirrer, and then the sodium silicate aqueous solution is added.
Example 10: a kiln tail anti-coking coating differing from example 8 in that:
in the pretreatment step of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide, the mixed filler is stored at the humidity of 45% RH.
Example 11: a kiln tail anti-coking coating differing from example 8 in that:
in the pretreatment step of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide, the mixed filler is stored at an environment humidity of 60% RH.
Example 12: a kiln tail anti-coking coating differing from example 10 in that:
in the pretreatment step of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide, the temperature of the sodium silicate aqueous solution is 25 ℃.
Example 13: a kiln tail anti-coking coating differing from example 10 in that:
in the pretreatment step of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide, the temperature of the sodium silicate aqueous solution is 31 ℃.
Example 14: a kiln tail anti-coking coating differing from example 13 in that:
in the pretreatment steps of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide, the concentration of the sodium silicate aqueous solution is 8 wt%.
Example 15: a kiln tail anti-coking coating differing from example 13 in that:
in the pretreatment steps of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide, the concentration of the sodium silicate aqueous solution is 11 wt%.
Example 16: a kiln tail anti-coking coating differing from example 13 in that:
in the pretreatment steps of the ceramic micro powder, the glass beads, the talcum powder and the aluminum hydroxide, the concentration of the sodium silicate aqueous solution is 15 wt%.
Example 17: a coating method of a kiln tail anti-coking coating comprises the following steps:
s1: washing the surface of the kiln tail refractory material by using a high-pressure water gun, spraying 75% alcohol on the surface of most cokes after washing off the cokes, drying, scraping the rest cokes, and finishing cleaning;
s2: coating the coating material on the surface of the cleaned and dried refractory material, wherein the thickness of the coating material is 1mm, starting a burner, heating the kiln tail of the rotary furnace to 140 ℃, and preserving the heat for 12 min; and heating the kiln tail to 700 ℃, and preserving the heat for 2 hours to finish curing to obtain the coating.
Example 18: a method for coating a kiln tail anti-coking coating, which is different from the method in example 17 in that:
s2: coating the coating material on the surface of the cleaned and dried refractory material, wherein the thickness of the coating material is 2.5mm, starting a burner, heating the kiln tail of the rotary furnace to 140 ℃, and preserving the heat for 15 min; and heating the kiln tail to 700 ℃, and preserving the heat for 2 hours to finish curing to obtain the coating.
Example 19: a method for coating a kiln tail anti-coking coating, which is different from the method in example 17 in that:
s2: coating the coating material on the surface of the cleaned and dried refractory material, wherein the thickness of the coating material is 3mm, starting a burner, heating the kiln tail of the rotary furnace to 150 ℃, and preserving the temperature for 17 min; and heating the kiln tail to 800 ℃, and preserving the heat for 2 hours to finish curing to obtain the coating.
Example 20: a method for coating a kiln tail anti-coking coating, which is different from the method in example 18 in that: the coating thickness of the coating material is 0.2 mm.
Example 21: a method for coating a kiln tail anti-coking coating, which is different from the method in example 18 in that: the coating material has a degree of coating of 1 mm.
Example 22: a method for coating a kiln tail anti-coking coating, which is different from the method in example 18 in that: the coating thickness of the coating material is 2 mm.
In the above examples, boron carbide was purchased from Teng-glow metallic materials, Inc., Qinghe, YT-Y-04-2, having an average particle diameter of 1 μm; the phenolic resin was purchased from Fengze glue making factory-liquid thermosetting phenolic resin in Linyi city, orchid and mountain areas.
The ceramic micro powder is purchased from Huibao technology Co., Ltd, Dongguan city, 1250 mesh; the glass beads are purchased from Nami Chi mineral products Co., Ltd, and have an average particle size of 30 μm; the talcum powder is purchased from commercial and trade companies, 1250 meshes, of the synthetic mineral products in the sea city; aluminum hydroxide was purchased from Zibozizi new materials science and technology Co., Ltd, brand AH-1. Sodium silicate was purchased from Jinan Shuangying chemical Co., Ltd.
Comparative example
Comparative example 1: a kiln tail anti-coking coating differing from example 1 in that the starting material did not include aluminum hydroxide.
Comparative example 2: a kiln tail anti-coking coating differing from example 1 in that the raw materials did not include aluminum hydroxide and talc.
Characterization test:
1. test for anti-coking Properties
Test subjects: examples 1 to 16 and comparative example 1 each coated with a coating corresponding to example 21 to give examples 1 to 16 and comparative example 1, and example 14 coated with coatings corresponding to examples 17 to 20 and example 22 to give examples 17 to 20 and example 22, respectively, for a total of 22 test samples.
The test method comprises the following steps: and preparing 6t of hazardous wastes of which the mixing is finished in the same batch. Divide into 23 consecutive adjacent regions with kiln tail 1m wide annular inner wall face, under the condition of not coating the coating, carry out the incineration disposal of 3t danger wastes. Specification of the rotary kiln: the inner diameter of the cylinder body is 4.3m, the length of the cylinder body is 70m, and the inclination is 2%; the parameters of the rotary kiln incineration treatment are as follows: the combustion temperature is 850 ℃ and 950 ℃, and the rotating speed of the cylinder body is 0.8 r/min. And stopping the rotary kiln after treatment, and scraping off the cokes in the 23 areas respectively and weighing the cokes to obtain the original coke amount of each area after the rotary kiln is cooled.
Examples 1-20, example 22, and comparative example 1 were applied to 23 areas, respectively, using comparative example 1, and the remaining area was left uncoated, as a blank control. And (3) burning the residual 3t of hazardous waste, cooling after treatment, scraping off the cokes in the 23 areas respectively, and weighing to obtain the coke amount in each area. The coke reduction was calculated as follows:
coking reduction (%) = (raw coking amount-present coking amount)/raw coking amount × 100%.
And (3) test results: the results of the anti-coking performance test are reported in table 1.
TABLE 1 anti-coking Performance test results
And (3) data analysis: the higher the coking reduction rate is, the greater the coking reduction rate is, the coking amount is reduced, and the anti-coking effect is good.
As can be seen from the data in Table 1, the anti-coking effects of the samples were better than those of the control group, and the anti-coking effects of the samples were better than those of the control group. The anti-coking effect in the sample from good to bad is as follows: examples 14 to 15, examples 20 and 22, examples 17 to 19, examples 12 to 13 and 16, examples 10 to 11, examples 7 to 9, examples 4 to 5, and examples 1 to 3.
Compared with the embodiment 1, the comparative example 1 does not adopt aluminum hydroxide, the anti-coking effect is much poorer, and the anti-sticking effect of the coating can be effectively improved by adding the aluminum hydroxide, so that the anti-coking effect is improved. The reasons may be: the aluminum hydroxide decomposes water and aluminum oxide at the temperature of 140-150 ℃, the aluminum oxide is used as a filler, the water is converted into gas, on one hand, the gas moves to the surface of the coating, on the other hand, a channel is formed, the movement of the ceramic micro powder, the glass micro powder and the talcum powder to the surface of the coating is promoted, and the migration of the heat-resistant filler is realized. The filler close to the surface of the coating is moved to the surface of the coating as far as possible, the filler which protrudes out of the coating can form an isolation layer after being moved to the surface of the coating, and on the other hand, the glass microspheres melt at high temperature to form a protective layer, and the ceramic micro powder is sintered at high temperature to form a compact inorganic material layer, so that the high-temperature resistant effect is achieved, and the anti-sticking effect can be achieved.
In the embodiment 5, pretreatment of ceramic micro powder, glass beads and talcum powder is added on the basis of the embodiment 2, so that the coking reduction rate is further improved, and the anti-coking effect is improved. The reasons may be: the silicate is attached to the surface of the filler, so that the temperature rise of the filler can be reduced to a certain extent, and the temperature difference between the inside and the outside of the filler is formed, thereby improving the migration effect of the aluminum hydroxide on the filler when water vapor is decomposed, improving the probability that the filler is close to the surface of the coating, and further improving the anti-coking effect.
In examples 7 to 9, low-temperature preservation treatment of ceramic fine powder, glass beads and talc powder was limited on the basis of example 5, and the coking reduction rate was further improved. The reasons may be: the adhesion rate of silicate on the surface of the filler can be improved by mixing after low temperature, so that the heat insulation effect of the surfaces of the ceramic micro powder, the glass beads and the talcum powder is improved, and the anti-sticking effect is improved.
In examples 10 to 11, the limitation of air humidity during the low-temperature storage treatment was added to example 8, and the coking reduction rate was further improved; in examples 12 to 13, the use temperature of the sodium silicate aqueous solution was limited on the basis of example 10, and the sodium silicate aqueous solution was mixed with the ceramic fine powder, the glass beads and the talc powder after the low-temperature treatment, thereby further improving the coking reduction rate. The reasons may be: the surfaces of the ceramic micro powder, the glass beads and the talcum powder are adhered with water with lower temperature, and when the ceramic micro powder, the glass beads and the talcum powder contact with aqueous solution with higher temperature, the ceramic micro powder, the glass beads and the talcum powder are instantly frozen and frozen to play a role in adhering the ceramic micro powder, the glass beads and the talcum powder, so that the adhesion amount of silicate is increased.
Examples 14 to 15 have a limited silicate concentration based on example 13, and the coking reduction rate was further improved. The reasons may be: the low-temperature mixed filler and the high-temperature sodium silicate aqueous solution with proper concentration, and the water and the sodium silicate are proper in dosage, so that the adhesion rate of silicate on the surface of the filler can be effectively improved, and the coking reduction rate is further improved. The silicate concentration of example 16 exceeded the preferred range and the coke reduction rate was slightly lower than that of examples 14 to 15.
The coating thickness of the practical sample 20, the practical sample 14 and the practical sample 22 is limited to be 0.2-2 on the basis of the practical sample 18, and the practical sample 20, the practical sample 14 and the practical sample 22 have better anti-coking effect compared with the practical sample 18; the reasons may be: in the coating with the thickness, the migration effect of the inorganic filler is better, and excellent filler migration rate can be obtained, so that the anti-sticking effect is improved.
2. Coating adhesion Strength test
Test subjects: example 1 and comparative examples 1-2, for a total of 3 test samples.
The test method comprises the following steps: high alumina bricks were prepared and cut into 70mm 50mm bricks for use, and three tests were performed for each test sample, with two bricks being used for each test. After example 1 and comparative examples 1-2 were applied to the 70mm x 50mm face of one block, the 70mm x 50mm face of the other block was bonded correspondingly; putting into a drying oven, heating to 140 ℃ and preserving heat for 15min, then transferring into a muffle furnace to heat to 700 ℃ and preserving heat for 2h, completing solidification, taking out and cooling to be tested.
Equipment: a universal test machine (CTM 2100) which respectively holds two bricks on an upper clamp and a lower clamp, wherein the moving speed of the upper clamp is 5mm/min until a coating is stripped, and a maximum tensile force value F (N) is obtained; the bonding surface area A is 70mm x 50 mm; the adhesion strength fb = F/a was calculated and recorded, and the average of three tests of the same test sample was calculated.
And (3) test results: the results of the coating adhesion strength test are reported in table 2.
TABLE 2 coating adhesion Strength test results
And (3) data analysis: as can be seen from the data in Table 2, comparative examples 1-2 are inferior in adhesive strength to example 1.
Compared with the example 1, the comparative example 1 does not adopt aluminum hydroxide, and the comparative example 2 does not adopt talcum powder and aluminum hydroxide, the bonding strength is lower than that of the example 1, and the use of the aluminum hydroxide and the talcum powder can have a positive effect on the bonding strength of the coating on the refractory material.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The kiln tail anti-coking coating is characterized in that the coating raw materials comprise the following components in parts by weight:
20-50 parts of boron carbide modified phenolic resin;
10-30 parts of ceramic micro powder;
5-10 parts of glass beads;
5-10 parts of talcum powder;
2-5 parts of aluminum hydroxide;
the boron carbide modified phenolic resin is prepared by the following method:
d1: uniformly mixing boron carbide and a silane coupling agent, adding phenolic resin, and uniformly mixing to obtain a mixture;
d2: preserving the heat of the mixture at 85-95 ℃ for 3-5min to obtain boron carbide modified phenolic resin;
the mass ratio of the boron carbide to the phenolic resin is 1: (5-9);
the dosage of the silane coupling agent is 0.5-1% of that of the boron carbide.
2. The kiln tail anti-coking coating as claimed in claim 1, wherein the ceramic micropowder, the glass microspheres and the talcum powder are premixed in silicate aqueous solution for 5-12h and then dried at 100-130 ℃.
3. The kiln tail anti-coking coating according to claim 2, characterized in that the ceramic micro powder, the glass beads and the talcum powder are firstly insulated for 1-3min at the temperature of-20 to-4 ℃ before mixing.
4. The kiln tail anti-coking coating according to claim 3, characterized in that the heat preservation for 1-3min is carried out at 45-60% RH.
5. The kiln tail anti-coking coating according to claim 3, characterized in that the temperature of the aqueous silicate solution is 25-31 ℃.
6. The kiln tail anti-coking coating according to claim 3, wherein the concentration of the aqueous silicate solution is 8-11% wt.
7. The kiln tail anti-coking coating according to claim 1, characterized in that the coating thickness is 0.2-2 mm.
8. The method for coating a kiln tail anti-coking coating according to any one of claims 1 to 7, characterized by comprising the following steps:
s1: cleaning and drying the surface of the kiln tail refractory material;
s2: coating the surface of the cleaned and dried refractory material with a coating material obtained by mixing the coating raw materials, heating the kiln tail of the rotary furnace to 140-150 ℃, and preserving the heat for 12-17 min; and then raising the temperature of the kiln tail to 700-.
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| CN113897136A (en) * | 2021-09-23 | 2022-01-07 | 宁波市杭州湾大桥发展有限公司 | Anticorrosive paint for bridge and coating method thereof |
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