CN113501681B - Temperature-resistant anti-corrosion lining coating for riser heat exchanger and construction method - Google Patents
Temperature-resistant anti-corrosion lining coating for riser heat exchanger and construction method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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Abstract
The invention relates to a temperature-resistant anti-corrosion lining coating for a riser heat exchanger and a construction method. The lining coating comprises 40.0-50.0% of electric mullite, 32.0-42.0% of silicon carbide powder, 5.0-10.0% of alumina micropowder, 2.0-10.0% of steel fiber and 2.0-10.0% of cement in percentage by mass, wherein the total mass of the electric mullite, the silicon carbide powder, the alumina micropowder, the steel fiber and the cement is 100% of the total mass of the electric mullite, the silicon carbide powder, the alumina micropowder, the steel fiber and the cement, and the mass of the silica sol is 5-10% of the total mass of the electric mullite, the silicon carbide powder, the alumina micropowder and the steel fiber; the construction method comprises the steps of mixing solid raw materials, preparing the paint, fixing the framework and coating the paint, wherein the prepared paint is uniformly coated on the inner wall of the rising pipe, and baking the paint into a formed solid paint layer after natural curing. The lining coating is uniformly coated on the inner wall of the riser heat exchanger and is fixed through the tortoise shell net, so that the coating is effectively prevented from peeling off, the problems of corrosion, coking and smoking of the riser heat exchanger are effectively solved, the damage of the riser heat exchanger is prevented, and the safety and stability of the heat exchange device are improved.
Description
Technical Field
The invention belongs to the technical field of riser coating, and particularly relates to a temperature-resistant anti-corrosion lining coating for a riser heat exchanger and a construction method.
Background
At present, coking coal is mainly heated and distilled in a coke oven by isolating air to generate coke, and a large amount of volatilized raw coke oven gas is generated. Wherein the red coke temperature pushed out by the coke oven carbonization chamber is 950-1050 ℃, and the raw coke oven gas temperature is 650-800 ℃.
The raw gas has complex components, high temperature and strong corrosiveness, tar is separated out when the temperature is reduced, and the phenomenon of inner wall corrosion and tar formation can occur in the use process of the rising pipe heat exchanger; the inner wall corrosion is seriously influenced, the service life of the riser heat exchanger is influenced, and potential safety hazards exist; the coking oil problem can cause the phenomenon that the coking plant can not normally discharge coke, and often emits black smoke and yellow smoke, thereby affecting the normal operation of the coke oven and causing serious environmental pollution.
The Chinese patent application CN 106543779A provides a high-temperature-resistant and corrosion-resistant nano self-cleaning coating, which consists of nano silicon dioxide, nano zirconium dioxide, nano ceramic powder, nano titanium dioxide, nano silicon nitride, nano ferric oxide, nano magnesium oxide, triphenyl phosphate, absolute ethyl alcohol, aminosilane and water, has complex components, has strict requirements on the surface of a riser tube during spraying, and is not easy to scrape slurry; the self-cleaning paint prevents tar adhesion through the low friction coefficient of the surface layer, but has poor heat exchange performance, and can not radically solve the problem of tar generation. At present, a temperature-resistant anti-corrosion lining coating for a riser heat exchanger and a construction method are urgently needed.
Disclosure of Invention
The invention aims to solve the technical problems that: aiming at the defects, the invention provides the temperature-resistant anti-corrosion lining coating for the riser heat exchanger and the construction method, wherein the lining coating is high-temperature-resistant plastic silicon carbide coating which is uniformly coated on the inner wall of the riser heat exchanger and is fixed through the tortoise shell net, so that the coating is effectively prevented from peeling, the problems of corrosion, coking and smoking of the riser heat exchanger are effectively solved, the damage to the riser heat exchanger caused by high-temperature corrosion is prevented, and the safety and stability of the heat exchange device are improved.
The technical scheme adopted for solving the technical problems is as follows: the temperature-resistant anti-corrosion lining coating for the riser heat exchanger comprises the following components: fused mullite, silicon carbide powder, alumina micropowder, steel fiber, cement and silica sol. The temperature-resistant corrosion-resistant lining coating for the riser heat exchanger takes the electrofused mullite as a coating base material and is matched with high-temperature-resistant corrosion-resistant silicon carbide powder, and the lining coating has good high-temperature resistance and corrosion resistance; the introduced auxiliary agent alumina micropowder can improve the fluidity of the coating, reduce the viscosity of the coating, and can form a continuous solid film with certain strength when in use, thereby ensuring the strength of the coating after molding; the introduced steel fibers can increase the fixing and heat transfer effects of the lining coating in use; cement is introduced, the lining paint has good adhesion with the inner wall of the riser and is easy to useThe plasticity is good when the slurry is hung; the introduced silica sol is used as a solvent, so that the electric melting mullite, silicon carbide powder, alumina micropowder, steel fiber and cement can be conveniently dispersed in the solvent system, and the component SiO in the silica sol is 2 The paint has the advantages of interaction with electric melting mullite, silicon carbide powder and alumina micro powder, intermolecular force, good cohesiveness, difficult peeling, easy drying and forming of paint, short construction period during application, and capability of isolating the corrosion of high-temperature raw gas to the inner wall of a riser after the paint is formed and solving the problem of tar generation.
Further, the mass percentages of the electrofused mullite, the silicon carbide powder, the alumina micro powder, the steel fiber and the cement are as follows:
the total mass percentage of the fused mullite, the silicon carbide powder, the alumina micro powder, the steel fiber and the cement is 100%, and the mass of the silica sol is 5% -10% of the total mass of the fused mullite, the silicon carbide powder, the alumina micro powder, the steel fiber and the cement.
Further, the mass percentages of the electrofused mullite, the silicon carbide powder, the alumina micro powder, the steel fiber and the cement are as follows:
the mass of the silica sol is 5.5-7.0% of the total mass of the fused mullite, the silicon carbide powder, the alumina micropowder, the steel fiber and the cement. The coating with the components of the quality is high in strength after being molded, is not easy to damage, resists the deformation and peeling problems caused by high temperature due to the action of the coating and the framework of the tortoise shell net, and has long service life, and the maximum high temperature of 2000 ℃ can be resisted by the coating; the heat-resistant corrosion-resistant lining coating for the rising pipe heat exchanger can also effectively improve the heat transfer coefficient of the inner wall of the rising pipe, prevent the condition that tar is separated out due to rapid temperature drop of raw gas caused by too fast heat transfer, and effectively solve the problems of coking and smoking of the rising pipe.
Further, al in the fused mullite 2 O 3 -SiO 2 The content is not less than 98.2%; the SiC content in the silicon carbide powder is not less than 95%; al in the alumina micropowder 2 O 3 The content is not less than 98.5%; stainless steel filaments with the diameter of 0.25 mm-1.0 mm and the length of 1 mm-10.0 mm are formed by the steel fibers; siO in the silica sol 2 The content is 25% -40%. The percentage content of main components in proper electrofused mullite, silicon carbide powder and alumina micro powder and silicon solution is limited, so that the material property of the lining coating for resisting temperature and corrosion is ensured; reasonable steel fiber diameter and length are limited, so that the connection strength between the steel fiber and the inner wall of the rising pipe, the tortoise shell net and the paint is convenient when the paint is coated, the problems of release deformation and peeling of the lining paint after being molded are avoided, and the steel fiber also has a heat transfer function and improves the heat transfer coefficient of the inner wall of the rising pipe heat exchanger to a certain extent.
Further, the particle size of the silicon carbide powder is 150-300 meshes; the alumina micropowder is alpha-Al 2 O 3 The particle size of the alumina micropowder is 600-1000 meshes. By alpha-Al 2 O 3 The alumina micropowder can improve the insulating property, the stability, the heat resistance, the formability and the crystal phase stability of the coating and has high hardness; meanwhile, the proper particle size of the silicon carbide powder and the proper particle size of the alumina micro powder are limited, the particle sizes are matched with each other, the strength of the coating after being molded is further improved, and the coating is not easy to damage.
The construction method of the temperature-resistant anti-corrosion lining coating for the riser heat exchanger comprises the following operation steps:
s1, mixing solid raw materials, namely respectively pouring fused mullite, silicon carbide powder, alumina micropowder, steel fiber and cement into a stirrer according to the mass ratio of the components of the temperature-resistant anti-corrosion lining coating for the riser heat exchanger, and uniformly stirring to form a solid mixed castable for later use;
s2, preparing a coating, namely adding the solid mixed castable mixed in the S1 into silica sol according to the percentage, bonding and stirring until the solid mixed castable is uniform;
s3, fixing a framework, performing sand blasting rust removal pretreatment on the inner wall of the rising pipe heat exchanger, and fixing a tortoise shell net on the inner wall of the rising pipe heat exchanger after the pretreatment is finished;
s4, coating, namely uniformly coating the coating prepared in the S2 on the inner wall of the riser, and baking the riser after natural curing to form a formed solid coating layer. The construction method of the lining coating is simple in process, the solid raw materials are uniformly mixed and then uniformly stirred with the silica sol, and the lining coating is prepared and used at present, so that the condition of air drying when the coating is placed for a long time is avoided; the tortoise shell net is introduced to serve as a connecting framework between the coating forming process and the inner wall of the rising pipe heat exchanger, so that the deformation and peeling problems caused by high-temperature raw gas can be effectively improved when the forming coating is used; the coating is baked and formed after natural curing, forming cracks caused by rapid evaporation of water are avoided at the beginning, the surface of the coating is flat and crack-free after coating and forming, the strength is high after forming, the coating is not easy to damage, the construction time is short, the coating can be put into use after baking of the coating is finished, and the working efficiency is high.
Further, the coating thickness of the coating in the S4 coating is larger than the thickness of the tortoise shell net. The relation between the coating thickness of the coating and the thickness of the tortoise shell net is limited, so that the direct contact between the tortoise shell net and raw gas is avoided, and the service life of the rising heat exchanger coated with the lining coating is influenced.
Further, the coating thickness of the coating in the S4 coating is 2 mm-10 mm. The proper coating thickness of the coating is limited according to the size of the riser heat exchanger, so that the corrosion of the high-temperature raw gas to the inner wall of the riser can be effectively isolated, and meanwhile, the formed lining coating has high strength, and is not easy to damage, deform and peel at high temperature.
Further, the natural curing time in the step S4 is 1 h-5 h, the baking time in the step S4 is 0.5 h-2 h, and the baking temperature is 250 ℃ to 400 ℃. The proper natural life time is limited, the cracks caused by the rapid reduction of moisture in the baking and forming process of the coating can be effectively avoided, and the service life of the coating after forming is long.
The beneficial effects of the invention are as follows:
1. the temperature-resistant anti-corrosion lining coating for the rising pipe heat exchanger can effectively isolate the corrosion of high-temperature raw gas on the inner wall of the rising pipe, has high strength after molding, is not easy to damage, resists the deformation and peeling problems caused by high temperature due to the action of the lining coating and the framework of a tortoise shell net, can resist the high temperature of 2000 ℃ at the highest, and has long service life; the heat-resistant corrosion-resistant lining coating for the rising pipe heat exchanger can also effectively improve the heat transfer coefficient of the inner wall of the rising pipe, prevent the condition that tar is separated out caused by rapid temperature drop of raw gas due to too fast heat transfer, effectively solve the problems of coking and smoking of the rising pipe, prevent the damage of the rising pipe heat exchanger caused by high-temperature corrosion, and improve the safety and stability of a heat exchange device.
2. The construction method of the temperature-resistant anti-corrosion lining coating for the riser heat exchanger is simple, the solid raw materials are uniformly mixed and then uniformly stirred with the silica sol, and the coating is prepared and used at present, so that the condition of air drying when the coating is placed for a long time is avoided; the tortoise shell net is introduced to serve as a connecting framework between the coating forming process and the inner wall of the rising pipe heat exchanger, so that the deformation and peeling problems caused by high-temperature raw gas can be effectively improved when the forming coating is used; the coating is baked and formed after natural curing, forming cracks caused by rapid evaporation of water are avoided at the beginning, the surface of the coating is flat and crack-free after coating and forming, the strength is high after forming, the coating is not easy to damage, the construction time is short, the coating can be put into use after baking of the coating is finished, and the working efficiency is high.
Drawings
The foregoing and other objects, features, and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic view of the structure of a riser heat exchanger after construction of the present invention;
FIG. 2 is a schematic cross-sectional view of a riser heat exchanger after construction of the present invention;
wherein: 1. an outer cylinder; 2. a heat preservation layer; 3. a heat exchange layer; 31. a water inlet; 32. a heat exchange cavity; 33. a water outlet; 34. a first dispenser; 35. a second dispenser; 36. a third dispenser; 4. an inner cylinder; 5. a lining coating; 6. tortoise shell net; 71. an upper connecting flange; 72. a lower connecting flange; 8. and a flue gas channel.
Detailed Description
The invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The total dosage of the solid raw materials of the electrofused mullite, the silicon carbide powder, the alumina micro powder, the steel fiber and the cement is calculated to be 100kg, 42.5kg of the electrofused mullite, 42.0kg of the silicon carbide powder, 5.6kg of the alumina micro powder, 3.5kg of the steel fiber and 6.4kg of the cement are taken, and 5.2kg of the silica sol is taken; al in the electric melting mullite 2 O 3 -SiO 2 The content is not less than 98.2%; the SiC content in the silicon carbide powder is 97%, and the particle size of the silicon carbide powder is 200 meshes; the alumina micropowder is alpha-Al 2 O 3 The grain size of the alumina micropowder is 800 meshes, and the alpha-Al 2 O 3 The content is 99.0 percent; stainless steel filaments with the diameter of 0.5mm and the length of 3.0 mm-5.0 mm are formed by the steel fibers; siO in the silica sol 2 The content is 30%.
When the lining coating is prepared, solid raw materials such as electrofused mullite, silicon carbide powder, alumina micropowder, steel fiber and cement are respectively poured into a stirrer, uniformly stirred, and the uniformly stirred solid mixture is poured into a silicon solution for uniform dispersion for later use.
Example 2
The total dosage of the solid raw materials of the electrofused mullite, the silicon carbide powder, the alumina micro powder, the steel fiber and the cement is calculated to be 100kg, 48.0kg of the electrofused mullite, 32.0kg of the silicon carbide powder, 7.0kg of the alumina micro powder, 7.5kg of the steel fiber and 5.5kg of the cement are taken, and 6.0kg of the silica sol is taken; al in the electric melting mullite 2 O 3 -SiO 2 The content is not less than 98.2%;the SiC content in the silicon carbide powder is 97%, and the particle size of the silicon carbide powder is 200 meshes; the alumina micropowder is alpha-Al 2 O 3 The grain size of the alumina micropowder is 800 meshes, and the alpha-Al 2 O 3 The content is 99.0 percent; stainless steel filaments with the diameter of 0.5mm and the length of 3.0 mm-5.0 mm are formed by the steel fibers; siO in the silica sol 2 The content is 30%.
Example 3
Taking 44.8kg of electrofused mullite, 36.6kg of silicon carbide powder, 7.5kg of aluminum oxide powder, 5.7kg of steel fiber and 5.4kg of cement and 6.8kg of silica sol by calculating the total dosage of the solid raw materials of electrofused mullite, silicon carbide powder, aluminum oxide powder, steel fiber and cement as 100 kg; al in the electric melting mullite 2 O 3 -SiO 2 The content is not less than 98.2%; the SiC content in the silicon carbide powder is 97%, and the particle size of the silicon carbide powder is 200 meshes; the alumina micropowder is alpha-Al 2 O 3 The grain size of the alumina micropowder is 800 meshes, and the alpha-Al 2 O 3 The content is 99.0 percent; stainless steel filaments with the diameter of 0.5mm and the length of 3.0 mm-5.0 mm are formed by the steel fibers; siO in the silica sol 2 The content is 30%.
Example 4
Taking 45.0kg of electrofused mullite, 36.8kg of silicon carbide powder, 7.4kg of aluminum oxide powder, 5.8kg of steel fiber and 5.0kg of cement and 6kg of silica sol by calculating the total dosage of solid raw materials of electrofused mullite, silicon carbide powder, aluminum oxide powder, steel fiber and cement as 100 kg; wherein Al in the fused mullite 2 O 3 -SiO 2 The content is not less than 98.2%; the SiC content in the silicon carbide powder is 97%, and the particle size of the silicon carbide powder is 200 meshes; the alumina micropowder is alpha-Al 2 O 3 The grain size of the alumina micropowder is 800 meshes, and the alpha-Al 2 O 3 The content is 99.0 percent; stainless steel filaments with the diameter of 0.5mm and the length of 3.0 mm-5.0 mm are formed by the steel fibers; siO in the silica sol 2 The content is 30%.
The lining coating was prepared in the same manner as described in example 1.
Example 5
The construction method of the temperature-resistant anti-corrosion lining coating for the riser heat exchanger comprises the following operation steps:
s1, mixing solid raw materials, preparing materials according to the mass ratio of the components of the temperature-resistant anti-corrosion lining coating for the riser heat exchanger in any one of the embodiment 1 and the embodiment 4, respectively pouring fused mullite, silicon carbide powder, alumina micropowder, steel fiber and cement into a stirrer, and uniformly stirring to form a solid mixed castable for later use;
s2, preparing a coating, namely adding the solid mixed castable mixed in the S1 into silica sol according to the percentage, bonding and stirring until the solid mixed castable is uniform;
s3, fixing a framework, performing sand blasting rust removal pretreatment on the inner wall of the rising pipe heat exchanger, and fixing a tortoise shell net on the inner wall of the rising pipe heat exchanger after the pretreatment is finished;
s4, coating the coating prepared in the step S2 on the inner wall of the rising pipe uniformly, wherein the thickness of the coated lining coating layer is larger than that of a tortoise shell net, and the thickness of the tortoise shell net is 1mm as an example, so that the inner wall of the rising pipe is effectively isolated from corrosion caused by high-temperature raw gas, the coating thickness of the coating is 2-10 mm, and the coating thickness of the coating is 5.0mm; after the coating is finished, natural curing is carried out for 1-5 h, the natural curing time can be 2-3 h according to the different sizes of the ascending tube heat exchangers and the different coating thicknesses of the coating, then the baking is carried out for 0.5-2 h at the baking temperature of 250-400 ℃, the baking temperature is controlled to be 300 ℃ and the baking time is controlled to be 1h, so that a solid coating layer formed by baking is formed, and the ascending tube heat exchanger after the baking is finished can be put into use.
Referring to fig. 1 and 2, after the construction method of the high corrosion resistant lining coating for the rising pipe heat exchanger described in embodiment 5 is adopted to construct on the inner wall of the rising pipe, a novel rising pipe heat exchange device is formed, the novel rising pipe heat exchange device comprises an inner cylinder 4 and an outer cylinder 1, the inner cylinder 4 is arranged in the outer cylinder 1, a flue gas channel 8 is formed in the inner cavity of the inner cylinder 4, and an upper connecting flange 71 and a lower connecting flange 72 are respectively arranged at the upper end part and the lower end part of the inner cylinder 4 and the outer cylinder 1; an insulation layer 2 and a heat exchange layer 3 are arranged between the inner cylinder 4 and the outer cylinder 1, the heat exchange layer 3 is arranged on the outer side of the inner cylinder 4, and the insulation layer 2 is arranged on the outer side of the heat exchange layer 3; the inner cylinder 4 is a seamless steel pipe, and the inner cylinder 4 is made of heat-resistant alloy steel; the outer cylinder 1 is made of stainless steel; the heat preservation layer 2 is an aerogel fiber felt; the inner surface of the inner cylinder 4 is provided with a lining coating 5, and the lining coating 5 is fixed with the inner cylinder 4 through a tortoise shell net 6;
the heat exchange layer 3 comprises a water inlet 31, a heat exchange cavity 32 and a water outlet 33, wherein the water inlet 31 penetrates through the outer cylinder 1 and the heat insulation layer 2 to be communicated with the heat exchange cavity 32, and the water inlet 31 is arranged at one side close to the lower connecting flange 72; the water outlet 33 is communicated with the heat exchange cavity 32 through the heat insulation layer 2 and the outer cylinder 1, and the water outlet 33 is arranged at one side close to the upper connecting flange 71; the water inlet 31 is provided with a first distributor 34, the water outlet 33 is provided with a second distributor 35, and the heat exchange cavity 32 is internally provided with a plurality of third distributors 36; the heat exchange cavity 32 is of a coiled pipe type or jacket type structure, and the layout of the heat exchange cavity 32 is set according to the heat exchange requirement of the riser heat exchange device.
The lining coating is a high-temperature-resistant plastic silicon carbide coating, is uniformly coated on the inner wall of the riser heat exchanger, is fixed through a tortoise shell net, effectively prevents the coating from peeling off, effectively solves the problems of corrosion, coking and smoking of the riser heat exchanger, prevents the riser heat exchanger from being damaged due to high-temperature corrosion, and improves the safety and stability of the heat exchange device; the formed novel ascending pipe heat exchange device has the advantages of good stability, long service life and high safety.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (3)
1. The temperature-resistant anti-corrosion lining coating for the riser heat exchanger is characterized by comprising the following components: electrofused mullite, silicon carbide powder, alumina micropowder, steel fiber, cement and silica sol;
the electric smelting mullite, silicon carbide powder, alumina micropowder, steel fiber and cement comprise the following components in percentage by mass:
the mass of the silica sol is 5.5% -7.0% of the total mass of the fused mullite, silicon carbide powder, alumina micropowder, steel fiber and cement;
al in the fused mullite 2 O 3 -SiO 2 The content is not less than 98.2%; the SiC content in the silicon carbide powder is not less than 95%; al in the alumina micropowder 2 O 3 The content is not less than 98.5%; stainless steel filaments with the diameter of 0.25 mm-1.0 mm and the length of 1 mm-10.0 mm are formed by the steel fibers; siO in the silica sol 2 The content is 25% -40%;
the particle size of the silicon carbide powder is 150-300 meshes; the alumina micropowder is alpha-Al 2 O 3 The particle size of the alumina micropowder is 600-1000 meshes.
2. The construction method of the temperature-resistant anti-corrosion lining coating for the riser heat exchanger is characterized by comprising the following operation steps of:
s1, mixing solid raw materials, preparing materials according to the mass ratio of the components of the temperature-resistant anti-corrosion lining coating for the riser heat exchanger, respectively pouring fused mullite, silicon carbide powder, alumina micropowder, steel fiber and cement into a stirrer, and uniformly stirring to form a solid mixed castable for later use;
s2, preparing a coating, namely adding the solid mixed castable mixed in the S1 into silica sol according to the percentage, and stirring until the solid mixed castable is uniform;
s3, fixing a framework, performing sand blasting rust removal pretreatment on the inner wall of the rising pipe heat exchanger, and fixing a tortoise shell net on the inner wall of the rising pipe heat exchanger after the pretreatment is finished, wherein the coating thickness of the coating in the coating is larger than that of the tortoise shell net;
s4, coating, namely uniformly coating the coating prepared in the S2 on the inner wall of the riser, and baking the riser after natural curing to form a formed solid coating layer;
the natural curing time in the step S4 is 1 h-5 h, the baking time in the step S4 is 0.5 h-2 h, and the baking temperature is 250 ℃ to 400 ℃.
3. The construction method of the temperature-resistant anticorrosive lining coating for the riser heat exchanger according to claim 2, wherein the construction method comprises the following steps: the coating thickness of the coating in the S4 coating is 2 mm-10 mm.
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| CN113501681B true CN113501681B (en) | 2023-05-02 |
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| CN101397213A (en) * | 2008-10-24 | 2009-04-01 | 浙江锦诚耐火材料有限公司 | Corundum-mullite self-flow refractory castable |
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| CN102093064B (en) * | 2010-12-21 | 2013-08-14 | 北京联合荣大工程材料有限责任公司 | Refractory spray coating with high steel fiber content and spraying method thereof |
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Inventor after: Ma Qinglei Inventor after: Zhang Jiali Inventor after: Liu Yang Inventor after: Shao Wei Inventor after: Han Pei Inventor before: Ma Qinglei Inventor before: Zhang Jiali Inventor before: Liu Yang Inventor before: Shao Wei Inventor before: Han Pei |