High-temperature-resistant and anti-corrosion composition and application thereof

Abstract

The invention provides a high-temperature-resistant and anti-corrosion composition, and also provides a high-temperature-resistant and anti-corrosion coating. The composition and the coating can be used for preparing a biomass combustion boiler, a petrochemical heat exchanger, a petrochemical condenser, a petrochemical heating furnace, a quench tower, a cooling tower, metallurgical equipment, an electric furnace, waste residue treatment equipment, hydrogen power equipment, a fuel cell, an automobile engine, an automobile exhaust system, a new energy automobile battery, a refractory material and a fireproof material. The composition or the coating provided by the invention can be applied to high-temperature flue gas pipelines, environment-friendly smoke exhaust chimneys, desulfurization equipment, environment-friendly dust removal equipment, transformers, ammeters, power equipment, fireproof coatings for buildings, agricultural machinery, photovoltaic panel coatings and the like, and can cope with high temperature or prevent corrosion after being coated on the equipment. In addition, the invention provides a biomass combustion boiler and a manufacturing method thereof. The composition and / or coating is coated on the inner wall of a hearth, a heat exchanger, a superheater, a reheater or a flue of the boiler.

Description

Technical Field

[0001] The present invention relates to the fields of materials and equipment manufacturing, and particularly to a high-temperature resistant and corrosion-proof composition and its applications in the preparation of biomass combustion boilers, petrochemical heat exchangers, etc. Background Art

[0002] Equipment and materials used in high-temperature and corrosive environments often face severe chemical erosion, oxidation, and mechanical damage problems. These environments include, but are not limited to, high-temperature combustion equipment, petrochemical equipment, metallurgical equipment, waste treatment equipment, hydrogen energy power systems, new energy vehicles, as well as high-temperature protection and environmental protection facilities, etc. To extend the service life of equipment, improve its safety and economic benefits, it is usually necessary to apply a protective coating with high-temperature resistance and corrosion-proof characteristics on its surface.

[0003] Currently, common high-temperature resistant and corrosion-proof coatings on the market mainly include inorganic ceramic coatings, metal oxide coatings, organic-inorganic composite coatings, and special functional coatings, etc. These coatings are mainly composed of components such as oxides, nitrides, silicates, phosphates, high-temperature resistant polymer resins, etc., to provide necessary heat resistance, chemical corrosion resistance, and wear resistance.

[0004] For example, ceramic-based high-temperature resistant coatings (such as alumina, zirconia, zirconium silicate coatings) can withstand extreme high temperatures, but are relatively brittle and have limited adhesion. Metal oxide coatings (such as iron oxide, chromium oxide, lanthanum oxide, etc.) have excellent oxidation resistance, but there is still room for improvement in their thermal shock resistance. Silicate and phosphate-based high-temperature resistant coatings provide certain heat resistance and corrosion resistance, but their stability and adhesion at high temperatures still need to be optimized. Organic-inorganic composite coatings (such as high-temperature resistant silicone, ceramic composite coatings) have excellent thermal shock resistance and corrosion resistance within a certain temperature range, but with the increase in temperature, problems such as carbonization or structural instability may occur.

[0005] Although the existing technologies can meet the requirements of specific fields to a certain extent, in extreme environments, such as long-term high temperature (>900 °C), strong acid and alkali erosion (pH 1 - 14), high humidity, and the action of chemical corrosion media (SO2, HCl, HF, NO x etc.), the existing coating materials still have problems such as limited heat resistance limit, insufficient anti-peeling property, poor durability, and limited environmental adaptability. Therefore, developing a coating with high-temperature resistance and corrosion-proof performance to meet the applications in a wider range of industrial and new energy fields is still a technical problem urgently needed to be solved in the industry.

[0006] The potential application scope of high-temperature resistant and corrosion-proof coatings is extensive, covering multiple industrial and new energy application scenarios in high-temperature and extreme environments, including but not limited to the following aspects.

[0007] For high-temperature combustion and energy equipment such as biomass combustion boilers, high-temperature flue gas and acidic corrosives (such as HCl, sulfur dioxide), chlorides, sulfates, etc. will accelerate the corrosion of the furnace and flue gas pipes; for fuel cells, involving high-temperature hydrogen-oxygen reaction environments, heat resistance and high electrical insulation are required; for hydrogen-powered equipment such as hydrogen combustion chambers and high-temperature electrolyzers, high-temperature stability and antioxidant capacity are required.

[0008] For petrochemical equipment such as heat exchangers, condensers, and heating furnaces, being exposed to high-temperature heat conduction and chemical reaction media for a long time is vulnerable to corrosion; for quench towers and cooling towers, facing the impact of rapid cooling and heating and the erosion of acidic cooling media, they need to have thermal shock resistance; for desulfurization equipment and dust removal equipment, in high-temperature flue gas and sulfur- and chlorine-containing environments, excellent corrosion resistance is required.

[0009] For metallurgical and high-temperature manufacturing equipment such as electric furnaces and steelmaking furnaces, high requirements for high-temperature resistance and resistance to molten slag erosion are required; for waste residue treatment equipment, high-temperature metal slag and acid-base waste liquid may cause serious corrosion; for high-temperature flue gas pipes and smoke stacks, they are long-term exposed to corrosive flue gas (such as nitrogen oxides, sulfur dioxide, hydrogen sulfide) environments.

[0010] For automotive and new energy transportation equipment such as automotive engines and exhaust systems, coatings are required to be heat-resistant (>800 °C), and at the same time have antioxidant, heat shock resistance, and anti-corrosion properties; for new energy vehicle batteries, in high-temperature operating environments, high-stability insulating coatings are needed to improve heat resistance and chemical corrosion resistance.

[0011] For power equipment and building fire protection such as transformers, electric meters, and power equipment, heat-resistant, insulating, and corrosion-resistant protective coatings are needed; for building fire-resistant coatings, used as fireproof materials for high-rise buildings, excellent high-temperature resistance and corrosion resistance are required.

[0012] For photovoltaic and agricultural applications such as photovoltaic panel coatings, in environments such as high temperature, strong light, and acid rain, resistance to aging, antioxidant, and anti-corrosion capabilities are required; for agricultural machinery, such as grain drying equipment, biogas equipment, etc., high-durability coatings are needed in high-temperature and humid environments.

[0013] The invention patent with the publication number CN106590087B discloses some coatings, but the inventors found that their high-temperature tolerance is still not very ideal after testing.

[0014] Currently, there is still an urgent need for coatings with high-temperature resistance and anti-corrosion properties. Summary of the Invention

[0015] Based on the technical solution disclosed in the invention patent with the publication number CN106590087B, the inventor further improved the coating formula, added various raw materials and carried out screening and testing, which involved silicon dioxide, calcium titanate, zirconium silicate, kaolin, calcined diatomaceous earth, iron(III) oxide, barium sulfate, iron phosphate and aluminum dihydrogen phosphate, etc. Finally, a coating with better high-temperature resistance and corrosion resistance was obtained, and thus the present invention was achieved.

[0016] Without being bound by theory, silicon dioxide may enhance the hardness of the coating, improve wear resistance, and provide certain acid and alkali resistance; calcium titanate may enhance corrosion resistance and improve thermal stability; zirconium silicate may improve the thermal shock resistance of the coating and increase mechanical strength at the same time; kaolin may improve the bonding performance of the coating; iron(III) oxide may enhance the oxidation resistance of the coating; barium sulfate may enhance the acid and alkali corrosion resistance of the coating.

[0017] The present invention provides a novel high-temperature resistant and corrosion-proof coating. By optimizing the composite components and using various inorganic oxides, nitrides, phosphates and other materials, a high-stability and high-temperature resistant protective coating is formed, which has more excellent heat resistance, chemical corrosion resistance and mechanical strength, and can be widely applied to industrial and new energy fields in multiple extreme environments.

[0018] In the first aspect of the present invention, a composition is provided, characterized in that the composition comprises:

[0019] yttrium oxide, lanthanum oxide, aluminum nitride, beryllium oxide, borax, barium molybdate, antimony oxide, silicon dioxide, calcium titanate, zirconium silicate, kaolin, iron(III) oxide, barium sulfate, iron phosphate and aluminum dihydrogen phosphate.

[0020] In some embodiments of the present invention, the composition comprises the following components or consists of the following:

[0021] 8-10 parts by weight of yttrium oxide, 8-10 parts by weight of lanthanum oxide, 27-29 parts by weight of aluminum nitride, 14-16 parts by weight of beryllium oxide, 14-16 parts by weight of borax, 1-3 parts by weight of barium molybdate, 0.5-1.5 parts by weight of antimony oxide, 5-7 parts by weight of silicon dioxide, 5-7 parts by weight of calcium titanate, 5-7 parts by weight of zirconium silicate, 0.5-1.5 parts by weight of kaolin, 0.5-1.5 parts by weight of iron(III) oxide, 0.5-1.5 parts by weight of barium sulfate, 0.5-1.5 parts by weight of iron phosphate, and 17-19 parts by weight of aluminum dihydrogen phosphate.

[0022] In some embodiments of the present invention, the composition comprises 17-19 parts by weight of water. In some embodiments of the present invention, the composition comprises 18 parts by weight of water.

[0023] In some embodiments of the present invention, the composition comprises:

[0024] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of iron(III) oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, and 18 parts by weight of aluminum dihydrogen phosphate.

[0025] In some embodiments of the present invention, the composition consists of:

[0026] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of iron(III) oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate.

[0027] In some embodiments of the present invention, the composition comprises:

[0028] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of iron(III) oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate, and an appropriate amount of water.

[0029] In some embodiments of the present invention, the composition comprises:

[0030] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of iron(III) oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate, and 18 parts by weight of water.

[0031] In some embodiments of the present invention, the composition consists of:

[0032] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate, and an appropriate amount of water.

[0033] In some embodiments of the present invention, the composition consists of the following:

[0034] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate, and 18 parts by weight of water.

[0035] In some embodiments of the present invention, the composition is prepared by the method described in Example 1. In some embodiments of the present invention, the composition is prepared by the preparation method of Coating 2 described in Example 1. In some embodiments of the present invention, the composition is prepared by the preparation method of Coating 5 described in Example 1.

[0036] In some embodiments of the present invention, the composition is a coating. In some embodiments of the present invention, the composition is a high-temperature resistant coating. In some embodiments of the present invention, the composition is an anti-corrosion coating. In some embodiments of the present invention, the composition is a high-temperature resistant and anti-corrosion coating.

[0037] In some embodiments of the present invention, the preparation method of the composition is as follows: Take 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate, mix them evenly; add an appropriate amount of water and adjust the viscosity to 6 seconds for a Zahn cup No. 4, then it is obtained.

[0038] In some embodiments of the present invention, the preparation method of the composition is as follows: take 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, and 1 part by weight of barium sulfate, mix them evenly, stir at a speed of 800 rpm for 5 minutes, and add 1 part by weight of acid inhibitor iron phosphate; then stir at a speed of 80 rpm for 15 minutes; pre-stir at 400-600 rpm for 5 minutes, then add 18 parts by weight of aluminum dihydrogen phosphate, and finally increase the speed to 800 rpm and stir for 30 minutes; add an appropriate amount of water while stirring at a speed of 80 rpm, and adjust the viscosity to 6 seconds for coating-4 cups.

[0039] In some embodiments of the present invention, the yttrium oxide is purchased from Anergy, product number A45828.

[0040] In some embodiments of the present invention, the lanthanum oxide is purchased from Anergy, product number A66282.

[0041] In some embodiments of the present invention, the aluminum nitride is purchased from ZA, product number A61326.

[0042] In some embodiments of the present invention, the beryllium oxide is purchased from Shanghai Jizhi Biochemical Technology, product number B69330.

[0043] In some embodiments of the present invention, the borax is purchased from Aladdin, product number S112465.

[0044] In some embodiments of the present invention, the barium molybdate is purchased from Shanghai Yuanye Biotechnology, product number S68077.

[0045] In some embodiments of the present invention, the antimony oxide is purchased from J&K, product number 51-5110.

[0046] In some embodiments of the present invention, the aluminum dihydrogen phosphate is purchased from Aladdin, product number A105659.

[0047] In some embodiments of the present invention, the ferric phosphate is purchased from Maclean, product number F854540.

[0048] In some embodiments of the present invention, the silica is purchased from Sigma, product number 274739.

[0049] In some embodiments of the present invention, the calcium titanate is purchased from ZA, item number A67685.

[0050] In some embodiments of the present invention, the zirconium silicate is purchased from ZA, product number A16332.

[0051] In some embodiments of the present invention, the kaolin is purchased from ANNAIJI, product number A17165.

[0052] In some embodiments of the present invention, the ferric oxide is purchased from Shanghai Haohong Biomedicine, product number 1181845.

[0053] In some embodiments of the present invention, the barium sulfate is purchased from Maclean, product number B802888.

[0054] In a second aspect of the present invention, a coating is provided, characterized in that the coating comprises the composition according to the present invention.

[0055] In some embodiments of the present invention, the coating is a high temperature resistant and corrosion resistant coating.

[0056] In some embodiments of the present invention, the coating comprises:

[0057] 8-10 parts by weight of yttrium oxide, 8-10 parts by weight of lanthanum oxide, 27-29 parts by weight of aluminum nitride, 14-16 parts by weight of beryllium oxide, 14-16 parts by weight of borax, 1-3 parts by weight of barium molybdate, 0.5-1.5 parts by weight of antimony oxide, 5-7 parts by weight of silicon dioxide, 5-7 parts by weight of calcium titanate, 5-7 parts by weight of zirconium silicate, 0.5-1.5 parts by weight of kaolin, 0.5-1.5 parts by weight of ferric oxide, 0.5-1.5 parts by weight of barium sulfate, 0.5-1.5 parts by weight of iron phosphate, and 17-19 parts by weight of aluminum dihydrogen phosphate.

[0058] In some embodiments of the present invention, the coating comprises:

[0059] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, and 18 parts by weight of aluminum dihydrogen phosphate.

[0060] In some embodiments of the present invention, the coating consists of:

[0061] 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of iron(III) oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, and 18 parts by weight of aluminum dihydrogen phosphate.

[0062] In a third aspect of the present invention, there is provided a biomass combustion boiler, characterized in that the biomass combustion boiler contains the composition or coating of the present invention.

[0063] In some embodiments of the present invention, the composition and / or the coating is coated on the inner wall of the furnace, heat exchanger, superheater, reheater and / or flue of the biomass combustion boiler.

[0064] In a fourth aspect of the present invention, there is provided a method for manufacturing a biomass combustion boiler, characterized in that the coating of the present invention is coated on the inner wall of the furnace, heat exchanger, superheater, reheater and / or flue of the biomass combustion boiler.

[0065] In some embodiments of the present invention, there is provided a method for manufacturing a biomass combustion boiler, characterized in that the coating of the present invention is coated on the inner wall of the furnace of the biomass combustion boiler.

[0066] In some embodiments of the present invention, there is provided a method for manufacturing a biomass combustion boiler, characterized in that the coating of the present invention is coated on the heat exchanger of the biomass combustion boiler.

[0067] In a fifth aspect of the present invention, there is provided a device, the device containing the composition of any one of the present invention or the coating of any one of the present invention;

[0068] The device is optionally selected from: biomass combustion boiler, petrochemical heat exchanger, petrochemical condenser, petrochemical heating furnace, quench tower, cooling tower, metallurgical equipment, electric furnace, waste residue treatment equipment, hydrogen power equipment, fuel cell, automobile engine, automobile exhaust system, new energy vehicle battery, high-temperature flue gas pipeline, environmental protection smoke exhaust chimney, desulfurization equipment, environmental protection dust removal equipment, transformer, electric meter, agricultural machinery and photovoltaic panel.

[0069] In some embodiments of the present invention, the device is a biomass combustion boiler. In some embodiments of the present invention, the device is a petrochemical heat exchanger. In some embodiments of the present invention, the device is a petrochemical condenser. In some embodiments of the present invention, the device is a petrochemical heating furnace.

[0070] In some embodiments of the present invention, the device is a quench tower. In some embodiments of the present invention, the device is a cooling tower. In some embodiments of the present invention, the device is a metallurgical device. In some embodiments of the present invention, the device is an electric furnace. In some embodiments of the present invention, the device is a waste residue treatment device. In some embodiments of the present invention, the device is a hydrogen-powered device. In some embodiments of the present invention, the device is a fuel cell. In some embodiments of the present invention, the device is an automotive engine. In some embodiments of the present invention, the device is an automotive exhaust system. In some embodiments of the present invention, the device is a new energy vehicle battery. In some embodiments of the present invention, the device is a high-temperature flue gas pipeline. In some embodiments of the present invention, the device is an environmental protection smoke exhaust chimney. In some embodiments of the present invention, the device is a desulfurization device. In some embodiments of the present invention, the device is an environmental protection dust removal device. In some embodiments of the present invention, the device is a transformer. In some embodiments of the present invention, the device is an electric meter. In some embodiments of the present invention, the device is an agricultural machine. In some embodiments of the present invention, the device is a photovoltaic panel.

[0071] In a sixth aspect of the present invention, there is provided the use of the composition and the coating of the present invention in any one of the following aspects: preparing a biomass combustion boiler, a petrochemical heat exchanger, a petrochemical condenser, a petrochemical heating furnace, a quench tower, a cooling tower, a metallurgical device, an electric furnace, a waste residue treatment device, a hydrogen-powered device, a fuel cell, an automotive engine, an automotive exhaust system, a new energy vehicle, a new energy vehicle battery, a refractory material, a fireproof material, a high-temperature flue gas pipeline, an environmental protection smoke exhaust chimney, a desulfurization device, an environmental protection dust removal device, a transformer, an electric meter, an electric power device, a refractory coating for building, an agricultural machine, a coating for a photovoltaic panel, etc.

[0072] In some embodiments of the present invention, the use is to coat the coating of the present invention.

[0073] In some embodiments of the present invention, the use is to cope with high temperature or corrosion prevention. In some embodiments of the present invention, the use is to cope with high temperature. In some embodiments of the present invention, the use is to prevent corrosion. In some embodiments of the present invention, the use is to cope with high-temperature corrosion.

[0074] In some embodiments of the present invention, there is provided the use of the composition as described in the present invention in the preparation of any one selected from biomass combustion boilers, petrochemical heat exchangers, petrochemical condensers, petrochemical heaters, quench towers, cooling towers, metallurgical equipment, electric furnaces, waste residue treatment equipment, hydrogen-powered equipment, fuel cells, automotive engines, automotive exhaust systems, new energy vehicles, new energy vehicle batteries, refractory materials, fireproof materials, high-temperature flue gas pipes, environmental protection smoke exhaust chimneys, desulfurization equipment, environmental protection dust removal equipment, transformers, electric meters, power equipment, refractory coatings for construction, agricultural machinery, and photovoltaic panel coatings.

[0075] In some embodiments of the present invention, there is provided the use of the coating as described in the present invention in the preparation of any one selected from biomass combustion boilers, petrochemical heat exchangers, petrochemical condensers, petrochemical heaters, quench towers, cooling towers, metallurgical equipment, electric furnaces, waste residue treatment equipment, hydrogen-powered equipment, fuel cells, automotive engines, automotive exhaust systems, new energy vehicles, new energy vehicle batteries, refractory materials, fireproof materials, high-temperature flue gas pipes, environmental protection smoke exhaust chimneys, desulfurization equipment, environmental protection dust removal equipment, transformers, electric meters, power equipment, refractory coatings for construction, agricultural machinery, and photovoltaic panel coatings.

[0076] In some embodiments of the present invention, there is provided the use of the composition as described in the present invention in the preparation of biomass combustion boilers, petrochemical heat exchangers, petrochemical condensers, fuel cells, automotive engines, automotive exhaust systems, new energy vehicle batteries, desulfurization equipment, environmental protection dust removal equipment, agricultural machinery, and photovoltaic panel coatings.

[0077] In some embodiments of the present invention, there is provided the use of the composition as described in the present invention in the preparation of biomass combustion boilers.

[0078] In some embodiments of the present invention, there is provided the use of the composition as described in the present invention in the preparation of refractory materials. In some embodiments of the present invention, there is provided the use of the composition as described in the present invention in the preparation of fireproof materials.

[0079] The coating of the present invention has the following characteristics:

[0080] (1) High-temperature tolerance: It contains high-temperature stable materials such as yttrium oxide, lanthanum oxide, aluminum nitride, beryllium oxide, calcium titanate, and zirconium silicate, and can withstand high temperatures of 900 °C or even higher (for example, about 1100 °C), and is suitable for high-temperature equipment.

[0081] (2) Anti-oxidation and corrosion resistance: Aluminum dihydrogen phosphate, silicon dioxide, borax, antimony oxide, etc. provide anti-oxidation and certain acid and alkali resistance, and are suitable for fields such as chemical engineering and metallurgy.

[0082] (3) Wear resistance and high mechanical strength: Containing kaolin, iron(III) oxide, and barium sulfate, it can enhance hardness and wear resistance, and is suitable for mechanical components.

[0083] (4) Electrical insulation performance: Iron phosphate, barium molybdate, zirconium silicate, etc. can enhance electrical insulation ability, and are suitable for electrical equipment.

[0084] In petrochemical heat exchangers, the composition and coating of the present invention can be used for anti-corrosion protection layers, anti-coking, and anti-corrosion.

[0085] In petrochemical condensers, the composition and coating of the present invention can be used for outer wall anti-corrosion coatings.

[0086] In petrochemical heating furnaces, the composition and coating of the present invention can be used for the protection layer inside the furnace chamber or on the outer wall.

[0087] In quench towers and cooling towers, the composition and coating of the present invention can be used for the protection of the inner wall of the tower.

[0088] In metallurgy (steelmaking, electric furnaces, etc.), the composition and coating of the present invention can be used for high-temperature resistant protection coatings.

[0089] In waste residue treatment equipment, the composition and coating of the present invention can be used for waste residue melting equipment and high-temperature furnaces.

[0090] In automobile manufacturing (engines, exhaust systems), the composition and coating of the present invention can be used for heat insulation or anti-oxidation coatings of engine exhaust systems.

[0091] In new energy vehicle manufacturing, the composition and coating of the present invention can be used for battery fire prevention, thermal management, and battery protection.

[0092] In refractory materials and fireproof materials, the composition and coating of the present invention can be used for fireproof coatings in high-temperature environments.

[0093] In high-temperature flue gas pipelines, the composition and coating of the present invention can be used for fireproof coatings in high-temperature environments.

[0094] In environmental protection exhaust systems (chimneys, desulfurization equipment), the composition and coating of the present invention can be used for high-temperature flue gas anti-corrosion protection.

[0095] In environmental protection dust removal equipment (electrostatic precipitators), the composition and coating of the present invention can be used for high-temperature wear-resistant protection layers.

[0096] In wires and cables, the composition and coating of the present invention can be used for fixing insulation layers.

[0097] In transformers, electric meters, and electrical equipment, the composition and coating of the present invention can be used for insulation coatings.

[0098] In architecture, construction and engineering, the composition and coating of the present invention can be used for fire-resistant coatings, such as fire-resistant protection of steel structures.

[0099] In agricultural machinery, the compositions and coatings of the present invention may be used for high temperature, wear resistance or corrosion protection.

[0100] In solar energy (photovoltaic panel coating), the compositions and coatings of the present invention can be used for corrosion protection of brackets. DETAILED DESCRIPTION

[0101] The present invention is further described below by way of specific examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are selected according to conventional methods and conditions, or according to the product specifications.

[0102] Example

[0103] Example 1. Coating preparation

[0104] The raw materials used include:

[0105] Yttrium oxide (Annaiji, product number A45828), lanthanum oxide (Annaiji, product number A66282), aluminum nitride (ЗA, product number A61326), beryllium oxide (Shanghai Jizhi Biochemical Technology, product number B69330), borax (Aladdin, product number S112465), barium molybdate (Shanghai Yuanye Biotechnology, product number S68077), antimony oxide (B&K, product number 51-5110);

[0106] Aluminum dihydrogen phosphate (Aladdin, product number A105659);

[0107] Ferric phosphate (McLean, product number F854540);

[0108] Silicon dioxide (Sigma, product number 274739), calcium titanate (ZA, product number A67685), zirconium silicate (ZA, product number A16332), kaolin (Annaiji, product number A17165), ferric oxide (Shanghai Haohong Biotechnology, product number 1181845), barium sulfate (McLean, product number B802888).

[0109] Take 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, and 1 part by weight of antimony oxide, mix them evenly, stir at 800 rpm for 5 minutes, and add 1 part by weight of acid inhibitor iron phosphate. Then stir at 80 rpm for 15 minutes. Pre-stir at 400-600 rpm for 5 minutes, then add 18 parts by weight of aluminum dihydrogen phosphate, and finally increase the speed to 800 rpm and stir for 30 minutes. Add an appropriate amount of water while stirring at 80 rpm, adjust the viscosity to 6 seconds for coating-4 cups, and obtain coating 1.

[0110] Take 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, and 1 part by weight of barium sulfate, mix them evenly, stir at 800 rpm for 5 minutes, and add 1 part by weight of acid inhibitor iron phosphate. Then stir at 80 rpm for 15 minutes. Pre-stir at 400-600 rpm for 5 minutes, then add 18 parts by weight of aluminum dihydrogen phosphate, and finally increase the speed to 800 rpm and stir for 30 minutes. Add an appropriate amount of water while stirring at 80 rpm, adjust the viscosity to 6 seconds for coating-4 cups, and obtain coating 2.

[0111] Take 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 1 part by weight of silicon dioxide, 1 part by weight of calcium titanate, 1 part by weight of zirconium silicate, 6 parts by weight of kaolin, 6 parts by weight of ferric oxide, and 8 parts by weight of barium sulfate, mix them evenly, stir at a speed of 800 rpm for 5 minutes, and add 1 part by weight of acid inhibitor iron phosphate. Then stir at a speed of 80 rpm for 15 minutes. Pre-stir at 400-600 rpm for 5 minutes, then add 18 parts by weight of aluminum dihydrogen phosphate, and finally increase the speed to 800 rpm and stir for 30 minutes. Add an appropriate amount of water while stirring at a speed of 80 rpm, adjust the viscosity to 6 seconds for coating-4 cups, and obtain coating 3 (the raw material ratio is changed compared to coating 2).

[0112] Take 6 parts by weight of silica, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, and 1 part by weight of barium sulfate, mix them evenly, and stir at a speed of 800 revolutions per minute for 5 minutes. Then stir at a speed of 80 revolutions per minute for 15 minutes. Stir at 400 - 600 revolutions per minute for 5 minutes, and finally increase the speed to 800 revolutions per minute and stir for 30 minutes. Add an appropriate amount of water while stirring at a speed of 80 revolutions per minute, and adjust the viscosity to 6 seconds for the No. 4 cup, obtaining Coating 4 (multiple raw materials are deleted compared to Coating 2).

[0113] Take 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silica, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, and 1 part by weight of barium sulfate, mix them evenly, and stir at a speed of 800 revolutions per minute for 5 minutes while adding 1 part by weight of the acidic inhibitor iron phosphate. Then stir at a speed of 80 revolutions per minute for 15 minutes. Pre-stir at 400 - 600 revolutions per minute for 5 minutes, then add 18 parts by weight of aluminum dihydrogen phosphate, and finally increase the speed to 800 revolutions per minute and stir for 30 minutes. Add 18 parts by weight of water while stirring at a speed of 80 revolutions per minute, obtaining Coating 5.

[0114] Example 2. Corrosion Resistance Test

[0115] Spray each coating prepared by the method described in Example 1 evenly onto a steel plate (boiler steel 310S, with dimensions of 100 mm × 100 mm × 6 mm) in a pneumatic manner, and the spraying thickness is 0.4 mm.

[0116] Weigh each steel plate before spraying, which is the weight before heating corrosion.

[0117] The experimental groups spray the above coatings respectively. After spraying, bake at 80 °C for 2 hours to ensure adhesion; then cure at high temperature in a heating furnace (keep at 200 °C for 1 hour, and then keep at 500 °C for 1 hour). The negative control group does not spray the coating, and other operations are the same. Each group has 5 steel plates for testing.

[0118] Then place each steel plate 5 cm above a graphite crucible added with borax, and place it in a heating furnace and heat to 900 °C and keep it for 5 days.

[0119] Then clean the corrosion layer of the steel plate in the negative control group with a steel brush and absolute ethanol, dry it and weigh it to obtain the weight after heating corrosion. Heat the steel plate sprayed with the coating to 200 °C, and quickly put it into normal temperature water to make the coating expand and crack, and clean it with a steel brush and absolute ethanol, dry it and weigh it to obtain the weight after heating corrosion.

[0120] The corrosion rate of the steel plate is calculated using the following formula:

[0121] Corrosion rate (mm / year) = {Mass loss (g) ÷ [Density (7.8 g / cm 3 ) × Total surface area of the steel plate (cm 2 ) × Exposure time (5 days)]} × 10 (mm / cm) × 365 (days)

[0122] Where: Mass loss (g) = Weight of the steel plate before heating and corrosion - Weight of the steel plate after heating and corrosion.

[0123] The results are shown in Table 1, and the average value within each group is taken for each set of data. The corrosion rate of the Coating 2 group is significantly lower than that of the non - coating group, Coating 1 group, Coating 3 group, and Coating 4 group, with a statistically significant difference (P < 0.01). The corrosion rate of the Coating 5 group is significantly lower than that of the non - coating group, Coating 1 group, Coating 3 group, and Coating 4 group, with a statistically significant difference (P < 0.01). It shows that Coating 2 and Coating 5 have very excellent anti - corrosion properties and can significantly reduce the high - temperature corrosion of boiler steel plates.

[0124] Table 1. Anti - corrosion test results

[0125]

[0126] Example 3. Anti - corrosion performance test

[0127] Using the same method as in Example 2, the only difference is that the experimental condition of "heating to 900 °C and holding for 5 days" is changed to "heating to 1100 °C and holding for 5 days", and the test is carried out again. The results are shown in Table 2, and the average value within each group is taken for each set of data. The corrosion rate of the Coating 2 group is significantly lower than that of the Coating 1 group, with a statistically significant difference (P < 0.001). The corrosion rate of the Coating 5 group is also significantly lower than that of the Coating 1 group (P < 0.001).

[0128] It is proved that Coating 2 and Coating 5 can significantly reduce the high - temperature corrosion of boiler steel plates.

[0129] Table 2. Anti - corrosion test results

[0130] Coating 1 Coating 2 Coating 5 Steel plate corrosion rate (mm / year) 0.628 0.067 0.091

[0131] Example 4. Anti - corrosion performance test

[0132] Using the method of the foregoing embodiment, boiler steel plate samples coated with Coating 2 or Coating 5 were respectively prepared. They were heated at 1100 °C for 24 hours and then naturally cooled to room temperature. Subsequently, they were completely immersed in a mixed solution containing 5% by mass of potassium chloride and potassium sulfate respectively, and soaked continuously for 24 hours (this condition is used to simulate the corrosion environment of the combined action of chloride-sulfate in the biomass boiler environment).

[0133] After the soaking was completed, the surface state was observed. The results showed that there was no obvious discoloration on the coating surface, no blistering, peeling, or cracking occurred, and no corrosion pits were formed. The above results indicate that this type of coating still has excellent corrosion resistance after high-temperature treatment and is suitable for coping with the corrosion challenges in the combustion environment of biomass-fired boilers.

[0134] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and do not constitute a limitation to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A composition, characterized in that, The composition comprises: 8 - 10 parts by weight of yttrium oxide, 8 - 10 parts by weight of lanthanum oxide, 27 - 29 parts by weight of aluminum nitride, 14 - 16 parts by weight of beryllium oxide, 14 - 16 parts by weight of borax, 1 - 3 parts by weight of barium molybdate, 0.5 - 1.5 parts by weight of antimony oxide, 5 - 7 parts by weight of silicon dioxide, 5 - 7 parts by weight of calcium titanate, 5 - 7 parts by weight of zirconium silicate, 0.5 - 1.5 parts by weight of kaolin, 0.5 - 1.5 parts by weight of ferric oxide, 0.5 - 1.5 parts by weight of barium sulfate, 0.5 - 1.5 parts by weight of iron phosphate, and 17 - 19 parts by weight of aluminum dihydrogen phosphate.

2. The composition according to claim 1, characterized in that, The composition consists of: 8 - 10 parts by weight of yttrium oxide, 8 - 10 parts by weight of lanthanum oxide, 27 - 29 parts by weight of aluminum nitride, 14 - 16 parts by weight of beryllium oxide, 14 - 16 parts by weight of borax, 1 - 3 parts by weight of barium molybdate, 0.5 - 1.5 parts by weight of antimony oxide, 5 - 7 parts by weight of silicon dioxide, 5 - 7 parts by weight of calcium titanate, 5 - 7 parts by weight of zirconium silicate, 0.5 - 1.5 parts by weight of kaolin, 0.5 - 1.5 parts by weight of ferric oxide, 0.5 - 1.5 parts by weight of barium sulfate, 0.5 - 1.5 parts by weight of iron phosphate, and 17 - 19 parts by weight of aluminum dihydrogen phosphate.

3. The composition according to claim 2, wherein The composition consists of: 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate.

4. The composition according to claim 3, wherein The preparation method of the composition is as follows: Take 9 parts by weight of yttrium oxide, 9 parts by weight of lanthanum oxide, 28 parts by weight of aluminum nitride, 15 parts by weight of beryllium oxide, 15 parts by weight of borax, 2 parts by weight of barium molybdate, 1 part by weight of antimony oxide, 6 parts by weight of silicon dioxide, 6 parts by weight of calcium titanate, 6 parts by weight of zirconium silicate, 1 part by weight of kaolin, 1 part by weight of ferric oxide, 1 part by weight of barium sulfate, 1 part by weight of iron phosphate, 18 parts by weight of aluminum dihydrogen phosphate, and mix them evenly; add an appropriate amount of water and adjust the viscosity to 6 seconds for a No. 4 cup, then it is obtained.

5. A coating, characterized in that, The coating comprises the composition according to any one of claims 1 - 4.

6. The coating according to claim 5, wherein The coating is a high - temperature resistant and corrosion - resistant coating.

7. A biomass combustion boiler, characterized in that, The biomass combustion boiler contains the composition according to any one of claims 1 - 4 or the coating according to any one of claims 5 - 6.

8. The biomass combustion boiler according to claim 7, wherein, The composition or the coating is coated on the inner wall of the furnace, heat exchanger, superheater, reheater or flue of the biomass combustion boiler.

9. A manufacturing method of a biomass combustion boiler, characterized in that, Coat the coating according to any one of claims 5 - 6 on the inner wall of the furnace, heat exchanger, superheater, reheater and / or flue of the biomass combustion boiler.

10. A device, characterized in that, The equipment contains the composition according to any one of claims 1 - 4 or the coating according to any one of claims 5 - 6; The device is optionally selected from: biomass combustion boilers, petrochemical heat exchangers, petrochemical condensers, petrochemical heaters, quench towers, cooling towers, metallurgical equipment, electric furnaces, waste residue treatment equipment, hydrogen-powered equipment, fuel cells, automobile engines, automobile exhaust systems, new energy vehicle batteries, high-temperature flue gas pipes, environmental protection smoke exhaust chimneys, desulfurization equipment, environmental protection dust removal equipment, transformers, electric meters, agricultural machinery, and photovoltaic panels.

11. The composition according to any one of claims 1-4 and the coating according to any one of claims 5-6 are used in the preparation of biomass combustion boilers, petrochemical heat exchangers, petrochemical condensers, petrochemical heaters, quench towers, cooling towers, metallurgical equipment, electric furnaces, waste residue treatment equipment, hydrogen-powered equipment, fuel cells, automobile engines, automobile exhaust systems, new energy vehicles, new energy vehicle batteries, refractory materials, fireproof materials, high-temperature flue gas pipes, environmental protection smoke exhaust chimneys, desulfurization equipment, environmental protection dust removal equipment, transformers, electric meters, power equipment, fire-resistant coatings for construction, agricultural machinery, and photovoltaic panel coatings; Optionally, the application is to coat the composition or coating of the present invention; Optionally, the application is to resist high temperature or corrosion.

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