CN112960986A - Heat-preservation coating material for propane dehydrogenation device and preparation method thereof - Google Patents
Heat-preservation coating material for propane dehydrogenation device and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a heat-insulating coating material for a propane dehydrogenation device and a preparation method thereof, wherein the heat-insulating coating material comprises 30-40% of heat-resistant fiber, 5-10% of floating beads, 6-12% of perlite, 3-8% of expanded vermiculite and 4-12% of volcanic rock by mass percentage; 5-13% of mullite hollow spheres, 3-8% of diatomite, 8-12% of clay, 8-15% of waste high-temperature sintered porous material, 0.5-1.5% of plasticizer, 10-30% of binding agent, 0-1.0% of hardening accelerator and 8-30% of water. The coating material can be integrally coated on the inner side of the high-temperature equipment steel shell, has good air tightness and thin coating thickness (the minimum thickness is 1cm), can effectively save the internal space of the device, avoids the internal atmosphere of the high-temperature equipment from corroding the steel shell, and has large cohesive force, large mechanical strength after hardening and good heat insulation performance.
Description
Technical Field
The invention belongs to the field of refractory materials, and particularly relates to a heat-preservation coating material between a refractory brick lining and a steel shell in a propane dehydrogenation device and a preparation method thereof.
Background
The process mode of propane dehydrogenation is an important means for obtaining propylene in China at present, the catofin process of U.S. Rumes company is most representative, and the ratio of the process introduced in China is high. The temperature of the outer wall of the steel shell of the reactor is ensured to be below 300 ℃ according to the design requirements of the process on the inner lining of the reactor. The temperature reaching the inner side of the steel shell is about 600-. The traditional method is to increase the thickness of calcium silicate boards to reach the effect of cooling, but the calcium silicate boards still have gaps in the joints, the confidentiality is not good, flame cross fire inside the reactor is easily caused, the local overtemperature and internal gas are leaked to contact the steel shell, then the steel shell is corroded, and the method cannot solve the problem well.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art, provides the heat-insulating coating material arranged on the inner side of the steel shell, realizes the integral protection of the inner side of the steel shell through coating construction, realizes great cooling, ensures the isolation of the inner side of the steel shell from gas in a reactor, and can well solve the problem.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the heat-preservation coating material for the propane dehydrogenation device comprises the following components in percentage by mass:
the sum of the mass of the components is 100 percent;
the following components are added in the total mass:
preferably, the heat-preservation coating material for the propane dehydrogenation device comprises the following components in percentage by mass:
the following components are added in the total mass:
specifically, the heat-resistant fiber is any one or combination of more than two of various mineral fibers such as glass fiber, mineral wool, aluminum silicate fiber, high-alumina fiber, mullite fiber and the like. The heat-resistant fiber mainly has the effect of reducing the heat conductivity coefficient of the product, particularly, after the heat-resistant fiber is changed into a round particle state from a filamentous loose agglomeration state through a granulation preparation process, the heat-resistant fiber participates in the particle grading distribution of the formula, the uniform and close contact between the heat-resistant fiber and other composition particles is realized by utilizing the closest packing principle, the problems that the traditional heat-resistant fiber is easy to agglomerate, is unevenly distributed and the like when being introduced are solved, and the heat conductivity coefficient is reduced to the maximum extent.
Specifically, the particle size of the floating beads is 40-200 meshes; the introduction of the floating beads has three main functions. Firstly, the floating beads are in a thin-wall hollow shape by utilizing the light weight and heat insulation performance of the floating beads, a part of gases such as nitrogen, hydrogen, carbon dioxide and the like can be remained in the hollow cavity in the forming process of the floating beads, and the heat conductivity coefficient can be well reduced by utilizing the heat insulation effect of the hollow and the internal gases thereof; secondly, the floating beads belong to a hard glass body of a silicon-aluminum oxide phase, so that strength loss caused by low-strength components in the formula of the invention, such as heat-resistant fibers, diatomite and vermiculite, is compensated; and thirdly, the surface form of the floating bead close to the theoretical circular shape and the state of particles with smaller sizes are utilized to effectively fill the pores among the particles in the formula, so as to play a role in lubrication and promote other components to realize tight packing through the rolling lubrication effect of the floating bead.
The perlite is closed-cell vitrified microsphere perlite, the particle size is 0.1-1.5mm, and the volume weight is 100-3The closed porosity is more than or equal to 95 percent, and the cylinder pressure strength is 30-40 percent. Compared with the common perlite, the vitrified perlite has more obvious advantages. The invention introduces the use of several of its properties: firstly, the high strength of the composite material is utilized to make up for the strength loss caused by the introduction of other components; secondly, the water absorption of medium and large particles in the formula composition is reduced by utilizing the characteristic of low surface vitrification water absorption, so that the overall water addition of the coating material is reduced, and the performance of the coating material is improved;
specifically, the particle size of the expanded vermiculite is 60-100 meshes, and the residual expansion rate is less than or equal to 10%; after raw vermiculite is roasted at high temperature, the volume of the raw vermiculite is rapidly expanded to dozens of times, and a plurality of fine air interlayers are formed inside the raw vermiculite.
The volcanic rock is pumice or volcanic slag; the volcanic rock is composed of particles with the particle size of 2-1mm and particles with the particle size of 1-0mm, and the proportion of the two particles is 2: 1. Pumice, also known as pumice, is a porous vitreous volcano-extrusive rock with low density (0.3-0.4 g/cm)3) Can float on the water surface; volcanic cinders, also called rock cinders, are one of debris products of volcanic eruption, and in the volcanic rock slurry eruption process, gas in molten rock is quickly dissipated before being condensed to form a large amount of rocks with round, long round or irregular air holes, and the volume density of the rocks is also highIs smaller. The volcanic rock is introduced in a large-size particle form, and the volcanic rock is mainly made of three large-core large-particle framework materials (the materials with the highest hardness and strength in the three large-core large-particle framework materials) which have high strength and are used as the whole coating material, and has the functions of light weight and heat preservation, the strength is improved, and the heat conducting performance is reduced.
Specifically, the mullite hollow sphere consists of particles with the particle size of 2.5-1mm and particles with the particle size of 1-0.5mm, wherein the composition ratio of the two particles is 3: 2; the hollow heat conducting core is mainly used as the second core framework of the three cores, and simultaneously, the hollow structure of the hollow heat conducting core is utilized to reduce the heat conducting property; in addition, in the three-core large-particle framework material, the other two materials are irregular, and the mullite hollow sphere is of a spherical structure, so that the effect of promoting the relative displacement of large particles can be realized in the three-core large-particle framework material, the contact chance among the particles is increased, and the overall structural strength is improved.
The particle diameter of the diatomite is 80-100 meshes, and the looseness is less than or equal to 0.5g/cm3And the heat-conducting property of the coating material is improved by utilizing the porous structure and the light weight characteristic of the coating material.
Specifically, the clay is any one of sepiolite, spherical clay, sodium-based modified bentonite and modified montmorillonite, and the particle size is 200-380 meshes. The main purpose of clay introduction is to improve the spreadability of the product of the invention, promote sintering at low temperature, and improve the strength of the spread.
Specifically, the waste high-temperature sintered porous material is a porous material waste which is subjected to high-temperature calcination, and the porous material waste comprises porous ceramic and a porous refractory material; the waste high-temperature sintered porous material consists of particles with the particle size of 2-1mm and particles with the particle size of 1-0.1mm, wherein the proportion of the two particles is 5: 3. The introduction objective is primarily considered in several respects: the first is waste utilization, cost reduction and resource saving; secondly, the high-temperature calcination of the coating belongs to the category of clinker, the volume stability is good, and the high-temperature shrinkage rate of the coating is reduced; the third is used as the third component of the skeleton material of three big core big particles.
Specifically, the plastic agent is selected from any one of carboxymethyl cellulose, gelatin, methyl cellulose, lignosulfonate and alkyl benzene sulfonate; the main purpose is to increase the plasticity and water retention of the coating material and improve the coating performance during construction.
The binding agent is one of solid/liquid modified water glass and silica sol; the modulus of the solid/liquid modified water glass is 2.3-3.0, and the optimal value is 2.85; cement or aluminum dihydrogen phosphate solution is not used, otherwise, the bonding strength is not required under the condition of not using the anchoring part in a matched manner, and the performance is influenced.
The hardening accelerator is any one of sodium fluosilicate, ethyl acetate and aluminum fluoride, and is mainly matched with the hardening acceleration effect of the binding agent when water glass is adopted.
Further, the invention also provides a preparation method of the heat-preservation coating material for the propane dehydrogenation device, which comprises the following steps:
(1) and (3) heat-resistant fiber granulation treatment: mixing heat-resistant fibers with common expanded perlite powder according to the volume ratio of 10:1, uniformly dispersing the heat-resistant fibers by occluding and tearing a fiber granulator, and granulating by taking the common expanded perlite powder as a particle core to form granular fiber cotton with the refractory fibers being less than 3 mm;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 3-5 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials to obtain the composite material.
Has the advantages that:
1. the coating material can be integrally coated on the inner side of the high-temperature equipment steel shell, the line change is small after the coating material is fired, the shrinkage is small, the steel shell is not easy to crack, the air tightness is good, the coating thickness is thin (the minimum thickness is 1cm), the internal space of the device can be effectively saved, and the corrosion of the internal atmosphere of the high-temperature equipment to the steel shell is avoided.
2. The invention has large cohesive force, can be firmly adhered to the steel shell under the condition that the steel shell is constructed without an anchoring part, has large mechanical strength (the compressive strength is more than or equal to 3.9MPa) after hardening, good heat-insulating property (the heat conductivity coefficient is 0.038-0.052W/mK), can effectively realize temperature reduction at the steel shell, and simultaneously can resist the thermal expansion and the cold contraction of the large-diameter steel shell at the temperature without being damaged or cracked because the invention has large mechanical strength after construction, thereby keeping the integrity and the airtightness of a coating layer.
3. The invention carries out granulation treatment on the heat-resistant fiber, effectively solves the problems of poor dispersion and incapability of uniformly distributing in coating materials caused by directly adding the fiber, and ensures that the heat-insulating and toughening effects of the fiber are exerted to the utmost extent.
4. According to the invention, volcanic rock is innovatively introduced as the hard aggregate, and the characteristics of porosity, high strength, high temperature resistance and the like are utilized, so that the overall strength and the heat preservation performance of the coating are effectively improved.
5. The invention introduces the waste high-temperature sintered porous material as the hard aggregate, changes waste into valuable, has wide introduced variety range, realizes resource recycling, is beneficial to improving the overall strength and the heat-insulating property of the coating material and reduces the cost.
Detailed Description
The invention will be better understood from the following examples.
Example 1
The formula of the heat-preservation coating for the propane dehydrogenation device comprises the following components:
adding the following components in percentage by mass:
the preparation method of the heat-preservation coating material for the propane dehydrogenation device comprises the following steps:
(1) and (3) heat-resistant fiber granulation treatment: mixing heat-resistant fibers and common expanded perlite powder for 10min according to the volume ratio of 10:1, uniformly dispersing the heat-resistant fibers by occluding and tearing a fiber granulator, and granulating by taking the common expanded perlite powder as a particle core to ensure that the fire-resistant fibers form packaged cellucotton with the particle size of less than 3 mm;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 3 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials for 8 min.
Example 2
The formula of the heat-preservation coating for the propane dehydrogenation device comprises the following components:
adding the following components in percentage by mass:
the preparation method of the heat-preservation coating material for the propane dehydrogenation device comprises the following steps:
(1) and (3) heat-resistant fiber granulation treatment: mixing heat-resistant fibers and common expanded perlite powder for 12min according to the volume ratio of 10:1, uniformly dispersing the heat-resistant fibers by occluding and tearing a fiber granulator, and granulating by taking the common expanded perlite powder as a particle core to ensure that the fire-resistant fibers form packaged cellucotton with the particle size of less than 3 mm;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 5 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials for 10 min.
Example 3
The formula of the heat-preservation coating for the propane dehydrogenation device comprises the following components:
adding the following components in percentage by mass:
plasticizer (lignosulfonate) 1.2%;
25% of a bonding agent (silica sol);
and 15% of water.
The preparation method of the heat-preservation coating material for the propane dehydrogenation device comprises the following steps:
(1) and (3) heat-resistant fiber granulation treatment: mixing heat-resistant fiber and common expanded perlite powder for 9min according to the volume ratio of 10:1, uniformly dispersing the heat-resistant fiber by occluding and tearing a fiber granulator, and granulating by using the common expanded perlite powder as a particle core to ensure that the fire-resistant fiber forms packaged cellucotton with the particle size of less than 3 mm;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 4 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials for 9 min.
Example 4
The formula of the heat-preservation coating for the propane dehydrogenation device comprises the following components:
adding the following components in percentage by mass:
the preparation method of the heat-preservation coating material for the propane dehydrogenation device comprises the following steps:
(1) and (3) heat-resistant fiber granulation treatment: mixing heat-resistant fibers and common expanded perlite powder for 7min according to the volume ratio of 10:1, uniformly dispersing the heat-resistant fibers by occluding and tearing a fiber granulator, and granulating by taking the common expanded perlite powder as a particle core to ensure that the fire-resistant fibers form packaged cellucotton with the particle size of less than 3 mm;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 3.5 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials for 12 min.
COMPARATIVE EXAMPLE 1 (COMPARATIVE EXAMPLE 1)
The formula of the heat-preservation coating for the propane dehydrogenation device comprises the following components:
adding the following components in percentage by mass:
the preparation method of the heat-preservation coating material for the propane dehydrogenation device comprises the following steps:
(1) the heat-resistant fiber is directly introduced without granulation treatment;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 3 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials for 8 min.
COMPARATIVE EXAMPLE 2 (COMPARATIVE EXAMPLE 4)
The formula of the heat-preservation coating for the propane dehydrogenation device comprises the following components:
adding the following components in percentage by mass:
the preparation method of the heat-preservation coating material for the propane dehydrogenation device comprises the following steps:
(1) and (3) heat-resistant fiber granulation treatment: mixing heat-resistant fibers and common expanded perlite powder for 7min according to the volume ratio of 10:1, uniformly dispersing the heat-resistant fibers by occluding and tearing a fiber granulator, and granulating by taking the common expanded perlite powder as a particle core to ensure that the fire-resistant fibers form packaged cellucotton with the particle size of less than 3 mm;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 3.5 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials for 12 min.
The performance parameters of the samples of examples 1-4 were measured using industry-accepted national standards or industry standards, with the results shown in table 1:
TABLE 1
From the data in table 1, it can be seen that: the product of the invention has the advantages of high strength, light weight, good heat-conducting property and the like, and meanwhile, the shrinkage proportion is small at high temperature, the phenomena of air leakage such as cracking and the like are not easy to generate, and the integrity and the air tightness of the product after smearing construction are favorably ensured. As can be seen from the comparative example 1, the heat-resistant fiber granulation treatment is only omitted, the loss of the strength and the heat conductivity coefficient is obvious, which shows that the heat-resistant fiber granulation treatment can obviously improve the uniform distribution of the fibers, not only can ensure the heat-insulating property of the product of the invention, but also can ensure the integral strength, and the fiber effect is exerted to the utmost extent; as can be seen from comparative example 2, only the introduction of volcanic rock is reduced, the strength loss is obvious, and the stress concentration caused by thermal expansion and cold contraction of the steel shell is not resisted.
The invention provides a heat-insulating coating for a propane dehydrogenation device and a preparation method thereof, and a method and a way for realizing the technical scheme are many, the above description is only a preferred embodiment of the invention, and it should be noted that, for a person skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the invention, and the improvements and decorations should also be regarded as the protection scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. The heat-preservation coating material for the propane dehydrogenation device is characterized by comprising the following components in percentage by mass:
the sum of the mass of the components is 100 percent;
the following components are added in the total mass:
2. the heat-insulating coating for the propane dehydrogenation device according to claim 1, which is characterized by comprising the following components in percentage by mass:
the following components are added in the total mass:
3. the thermal insulating coating for propane dehydrogenation unit according to claim 1 or 2, wherein the heat-resistant fiber is one or a combination of two or more of glass fiber, mineral wool, alumina silicate fiber, high alumina fiber and mullite fiber.
4. The thermal insulation coating for the propane dehydrogenation unit according to claim 1 or 2, wherein the floating bead has a particle size of 40 to 200 meshes;
the perlite is closed-cell vitrified microsphere perlite, the particle size is 0.1-1.5mm, and the volume weight is 100-3The closed porosity is more than or equal to 95 percent, and the cylinder pressure strength is 30-40 percent.
5. The thermal insulation coating for the propane dehydrogenation device according to claim 1 or 2, wherein the particle size of the expanded vermiculite is 60-100 meshes, and the residual expansion rate is less than or equal to 10%;
the volcanic rock is pumice or volcanic slag; the volcanic rock is composed of particles with the particle size of 2-1mm and particles with the particle size of 1-0mm, and the proportion of the two particles is 2: 1.
6. The thermal insulation coating for the propane dehydrogenation device as claimed in claim 1 or 2, wherein the mullite hollow spheres are composed of particles with the particle size of 2.5-1mm and particles with the particle size of 1-0.5mm, and the proportion of the two particles is 3: 2;
the particle diameter of the diatomite is 80-100 meshes, and the looseness is less than or equal to 0.5g/cm3。
7. The thermal insulation coating material for the propane dehydrogenation device as defined in claim 1 or 2, wherein the clay is any one of sepiolite, spherical clay, sodium-based modified bentonite and modified montmorillonite, and the particle size is 200-380 meshes.
8. The thermal insulation coating for the propane dehydrogenation unit according to claim 1 or 2, wherein the waste high-temperature sintered porous material is a high-temperature calcined porous material waste material, and the porous material waste material comprises porous ceramic and porous refractory material; the waste high-temperature sintered porous material consists of particles with the particle size of 2-1mm and particles with the particle size of 1-0.1mm, wherein the proportion of the two particles is 5: 3.
9. The thermal insulating spread for propane dehydrogenation unit according to claim 1 or 2, wherein the plasticizer is any one selected from the group consisting of carboxymethyl cellulose, gelatin, methyl cellulose, lignosulfonate, and alkylbenzenesulfonate;
the binding agent is one of solid/liquid modified water glass and silica sol; the modulus of the solid/liquid modified water glass is 2.3-3.0;
the hardening accelerator is any one of sodium fluosilicate, ethyl acetate and aluminum fluoride.
10. The method for producing an insulating coating for a propane dehydrogenation unit according to claim 1 or 2, characterized by comprising the steps of:
(1) and (3) heat-resistant fiber granulation treatment: mixing heat-resistant fibers with common expanded perlite powder according to the volume ratio of 10:1, uniformly dispersing the heat-resistant fibers by occluding and tearing a fiber granulator, and granulating by taking the common expanded perlite powder as a particle core to form granular fiber cotton with the refractory fibers being less than 3 mm;
(2) pretreatment of expanded vermiculite: calcining expanded vermiculite at 500 ℃ for 3-5 hours, and homogenizing the residual expansion rate of the expanded vermiculite;
(3) mixing the plasticizer, the binding agent, the hardening accelerator and water to prepare a solution, and then uniformly stirring and mixing the solution with other raw materials to obtain the composite material.
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