CN112032751A - Chimney and steel matrix flue joint anticorrosive layer structure and preparation method thereof - Google Patents
Chimney and steel matrix flue joint anticorrosive layer structure and preparation method thereof Download PDFInfo
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- CN112032751A CN112032751A CN202010903972.7A CN202010903972A CN112032751A CN 112032751 A CN112032751 A CN 112032751A CN 202010903972 A CN202010903972 A CN 202010903972A CN 112032751 A CN112032751 A CN 112032751A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/02—Linings; Jackets; Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/04—Joints; Connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2213/00—Chimneys or flues
- F23J2213/10—Linings
- F23J2213/101—Fastening means therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2213/00—Chimneys or flues
- F23J2213/30—Specific materials
- F23J2213/302—Specific materials plastic
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Abstract
The invention belongs to the technical field of desulfurization and anticorrosion treatment of a thermal power plant, and discloses an anticorrosive layer structure of a chimney-steel substrate chimney joint seam and a preparation method thereof, wherein the anticorrosive layer structure is arranged between a steel chimney substrate and a concrete chimney substrate and on the inner side wall of the steel chimney substrate; the anti-corrosion layer structure of the intersection joint of the steel substrate flue and the concrete flue has the advantages of simple structure, convenience and quickness in use, good anti-corrosion effect and capability of overcoming the defect of deformation of the substrate.
Description
Technical Field
The invention relates to an anticorrosive layer structure of a joint seam between a chimney and a steel matrix flue and a preparation method thereof, belonging to the technical field of desulfurization anticorrosive treatment of a thermal power plant.
Background
A large amount of SO is contained in a large amount of flue gas discharged by a thermal power plant2In which SO2The acid liquor is combined with water in the air to form acid liquor, and the acid liquor is accumulated in the form of acid rain to pollute the environment, thereby affecting the health of people.Along with the attention of people to environmental pollution (especially atmospheric pollution), the pollution of a large amount of flue gas that thermal power plant discharged to atmospheric air receives people's attention more and more, consequently requires that thermal power plant need pass through desulfurization treatment before discharging, and it is low temperature wet flue gas, the acidizing fluid that contains different compositions to discharge into atmospheric air after the desulfurization, if: sulfuric acid, nitric acid and the like have strong corrosivity, and the acid liquor brings great corrosion to desulfurization equipment, a flue gas flue and the like in different degrees, so that how to perform anticorrosion measures on a chimney (flue) becomes a problem to be solved.
At present, in some thermal power plants using a desulfurization device, part of a concrete flue is replaced by a carbon steel matrix flue, and the replaced section of mixed flue plays an important role, on one hand, the mixed flue plays a role in conveying high-temperature dry flue gas, and on the other hand, the mixed flue also plays an important role in conveying desulfurized wet flue gas, so that the reasonable anticorrosive coating structure is selected in the section of mixed flue (particularly the joint of the steel matrix flue and the concrete matrix flue). When the desulfurization operation is carried out, the low-temperature wet flue gas after desulfurization passes through the section of flue and then enters the chimney, and at the moment, the flue is in a weakly acidic wet environment, and acid liquid accumulation exists. When the ignition of the power plant boiler or the desulfurization equipment is shut down due to a fault, the high-temperature dry flue gas directly enters the chimney through the section of flue, and the flue is in a high-temperature and dusty environment. At the moment, the inside of the flue is in a dry-wet high-low temperature alternative environment, the matrix expands with heat and contracts with cold greatly, the conditions are severe, and the requirements on the structure and the performance of the anticorrosive coating are high. If the structure of the anti-corrosion layer is unreasonable to select, the anti-corrosion protective layer does not play a role in protection and isolation, acid liquor can penetrate through the anti-corrosion layer to permeate into the base body to corrode the base body, a large amount of acid liquor leaks out of a joint seam of a steel base body flue and a concrete base body flue to pollute the environment, even the flue in the section cannot be used, and the whole power plant is stopped to generate electricity.
At present, the method for treating the joint seam between a steel matrix flue and a concrete matrix flue is to fill with asbestos ropes and then make a glass fiber reinforced plastic anticorrosive coating on the asbestos ropes. This scheme construction convenience, cost are lower, but the result of use is not good, because the environment is abominable, and expend with heat and contract with cold easily cause the anticorrosive coating to destroy, drop, have just also caused the shortcoming that needs frequent maintenance, overhaul at every turn and all must change this anticorrosive coating for cost of maintenance is high.
Disclosure of Invention
The invention aims to: the anti-corrosion layer structure for the joint seam of the chimney and the steel matrix flue and the preparation method thereof have the advantages of simple structure, convenience and quickness in use, good anti-corrosion effect, capability of overcoming matrix deformation and the like.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the utility model provides a chimney and steel substrate flue handing-over seam anticorrosive coating structure, the anticorrosive coating structure is located between steel flue base member and the concrete chimney base member and on the inboard lateral wall, the anticorrosive coating structure is including locating the silica gel filling layer in the handing-over seam between steel flue base member and the concrete chimney base member, flexible filling layer and fluororubber covering are attached in proper order to the top of silica gel filling layer, flexible filling layer is attached in the silica gel filling layer, the one end of flexible filling layer and fluororubber covering is all attached in the steel flue base member, and the other end is all attached in the concrete chimney base member to make the clearance between steel flue base member and the concrete chimney base member sealed.
Elastic silica gel is filled in the joint seams to form a silica gel filling layer which is used as an anticorrosive layer structure of the flue base body, corrosion of various acid liquor in the flue can be resisted, the durability is good, the extension performance is good, damage caused by deformation of the flue can be effectively resisted, the acid liquor is prevented from leaking out of the flue to cause pollution, the flexible filling layer and the fluororubber skin are arranged above the silica gel filling layer, and two ends of the flexible filling layer and the fluororubber skin are respectively fixed on the steel flue base body and the concrete flue base body, so that the first silica gel layer filling layer is given a certain flexibility, the silica gel filling layer is prevented from being broken, the whole anticorrosive layer structure is prevented from being cracked, and the. The design can fully resist thermal expansion, cold and vibration, the overall performance is good, the silica gel filling layer, the flexible filling layer and the fluororubber skin are combined to form an anticorrosive layer structure of the flue base body, corrosion of various acid liquids in the flue can be resisted, the durability is good, the extension performance is good, and damage caused by deformation of the flue can be effectively resisted. The three-layer design is organically combined and is stably connected with the steel flue base body and the anti-corrosion material layer of the concrete flue base body, so that the anti-corrosion material layer has good protective performance, the stability and the reliability of the anti-corrosion layer structure are guaranteed, the service life is long, and the maintenance cost is low.
Furthermore, the lower parts of the fluororubber masking skins close to the steel flue base body and the concrete flue base body are respectively provided with a silica gel filling layer, the silica gel filling layer close to the steel flue base body is provided with a fixing bolt and a nut, and the silica gel filling layer close to the concrete flue base body is provided with a stabilizing screw. The design of silica gel filling layer improves the fixed stability of flexible filling layer and fluorine rubber covering, and makes the side of fluorine rubber covering and the side of anticorrosive material layer on same water flat line, and the follow-up installation screw material layer of being convenient for avoids leaving the clearance, prevents that the acidizing fluid invasion from corroding.
Furthermore, the inner side walls of the steel flue base body and the concrete flue base body are also provided with an anticorrosive material layer.
Further, a screw sealing layer is arranged above the fixing bolt and the stabilizing screw, one end of the screw sealing layer is attached to the anticorrosive material layer, and the other end of the screw sealing layer is attached to the fluororubber skin. The screw sealing layers are arranged on the surfaces of the fixing bolt and the stabilizing screw, so that the fixing bolt and the stabilizing screw are prevented from being corroded by acidic liquid in the flue, and the service life of the fixing bolt and the stabilizing screw is prolonged.
Furthermore, FRP pressing strips are arranged at the positions close to the fixing bolts and the stabilizing screws. The fixing bolt and the stabilizing screw penetrate through the FRP pressing strip to be connected to the steel flue base body and the concrete flue base body, and the FRP pressing strip is attached to the upper surface of the flexible filling layer. By adopting the structure, the FRP pressing strip is padded under the fixing bolt and the stabilizing screw, so that the stabilizing screw can press the flexible filling layer more tightly, the flexible filling layer cannot be damaged, the protective layer structure is more stable and reliable, and the corrosion resistance is better.
Furthermore, vitrified tiles are arranged on the outer sides of the screw sealing layer and the fluororubber skin. And the vitrified ceramic tile and the fluororubber skin are filled and sealed through a flexible filling layer.
Further, the preparation method of the anticorrosive coating structure of the joint seam of the chimney and the steel matrix flue comprises the following steps:
1) the side walls of the steel flue base body and the concrete flue base body are coated with anticorrosive material layers;
2) filling a gap between the steel flue base body and the concrete flue base body with the silica gel filling layer;
3) sequentially placing the flexible filling layer and the fluororubber skin above the silica gel filling layer, wherein the silica gel filling layers are respectively arranged below the fluororubber skin close to the steel flue base body and the concrete flue base body, so that the upper surfaces of two ends of the fluororubber skin are flush with the anticorrosive material layer;
4) FRP (fiber reinforced plastic) pressing strips are respectively padded under the fixing bolt and the stabilizing screw, so that the fixing bolt fixes one ends of the flexible filling layer and the fluororubber skin above the steel flue base body, and the stabilizing screw fixes the other ends of the flexible filling layer and the fluororubber skin above the concrete chimney base body;
5) and screw sealing layers are pasted on the outer sides of the fixing bolts and the fixing screws.
Further, the preparation method of the anticorrosive material layer comprises the following steps:
1) the outer wall of the steel flue substrate is coated with a silicon carbide coating layer, and raw materials of the silicon carbide coating layer comprise green silicon carbide and organic silicon resin;
preferably, the raw materials of the silicon carbide coating layer comprise 15-20 parts of green silicon carbide and 20-22 parts of organic silicon resin in parts by weight;
2) the outer wall of the silicon carbide coating layer is coated with a mixed coating layer, and the raw materials of the mixed coating layer comprise silicon carbide, graphene, zirconia and organic silicon resin;
preferably, the raw materials of the mixed coating layer comprise, by weight, 4-6 parts of silicon carbide, 2-6 parts of graphene, 12-18 parts of zirconium oxide and 30-32 parts of organic silicon resin;
preferably, the silicon carbide is green silicon carbide, and the zirconia is tetragonal zirconia.
The green silicon carbide is prepared by using petroleum coke and high-quality silica as main raw materials, adding salt as an additive and smelting in a resistance furnace at high temperature, and the smelted crystal has high purity and high hardness, the hardness is between that of corundum and diamond, and the mechanical strength is higher than that of corundum. The green silicon carbide contains more than 97 percent of SiC and has good self-sharpening property. The green silicon carbide is similar to the steel flue base body in material property, so that the attaching degree and the stability of the silicon carbide coating layer and the steel flue base body are improved, and the possibility of breakage of the silicon carbide coating layer and the steel flue base body is reduced.
The compact zirconia composed of fine-grained tetragonal phase has high strength toughness, bending strength >2GPa, and fracture toughness (KIC) >20 MPa.m 1/2. The wear resistance is good. High hardness and low thermal conductivity. The tetragonal crystal form zirconia has stable property and better fracture resistance, and the combination of the tetragonal crystal form zirconia, the green silicon carbide and the graphene does not need to add extra preparation, so that the tetragonal crystal form zirconia has the effects of corrosion resistance, high temperature resistance and excellent stability; the design changes the proportion of the components through fewer components, so that the design has better technical effect compared with the prior art.
Further, the preparation method of the screw sealing layer comprises the following steps:
1) at ZrO (C)3H7)4Adding alcohol and water, adding acid as a catalyst, mixing, starting hydrolysis reaction, finally forming sol, and then carrying out polymerization reaction to obtain gel;
2) drying and spinning part of the gel, and then heating at the high temperature of 700-800 ℃ for inorganic treatment to prepare zirconia fiber;
3) mixing the residual gel with black silicon carbide, coating the mixture on the surface of zirconia fiber, attaching the mixture above a fixing bolt and a stabilizing screw, and attaching two sides of the zirconia fiber to the outer sides of an anticorrosive material layer and a fluororubber skin respectively.
The specific contents of the partial gel and the residual gel in the preparation method can be adaptively adjusted according to actual conditions, and the components and parameter settings added in the preparation method can be adaptively adjusted within the range according to the prior art and actual requirements. The black silicon carbide contains SiC of about 98.5 percent, has higher toughness than green silicon carbide, is mostly used for processing materials with low tensile strength, and is applied to preparing the screw densityThe seal layer improves the stability of the screw seal layer; the zirconia fiber is a polycrystalline refractory fiber material which can meet the requirement of long-term use in an ultrahigh-temperature oxidizing atmosphere above 1600 ℃. Due to ZrO2High melting point of 2715 ℃, no oxidation and other excellent high-temperature characteristics, so that ZrO2The fiber has higher use temperature and better heat insulation performance than the existing refractory fiber varieties in the domestic market, and has stable high-temperature chemical property, corrosion resistance, oxidation resistance, thermal shock resistance, non-volatility and no pollution.
The invention has the beneficial effects that:
1. the anti-corrosion layer structure of the intersection joint of the steel substrate flue and the concrete flue has the advantages of simple structure, convenience and quickness in use, good anti-corrosion effect and capability of overcoming the defect of deformation of the substrate;
2. the anti-corrosion layer structure of the intersection joint of the steel substrate flue and the concrete flue can prevent acid liquor corrosion and flue gas scouring, has good anti-corrosion performance, is not easy to damage, and has long service life and low cost;
3. the anti-corrosion layer structure of the joint of the steel substrate flue and the concrete flue has good wear resistance, can effectively prevent the influence of expansion with heat and contraction with cold, acid corrosion and flue gas scouring, can reduce the maintenance frequency, reduce the use and maintenance cost, and is beneficial to popularization;
4. according to the design of the anticorrosive material layer, the tetragonal crystal form zirconium oxide has stable property and better fracture resistance, and the combination of the tetragonal crystal form zirconium oxide, the green silicon carbide and the graphene does not need to add an additional preparation, so that the tetragonal crystal form zirconium oxide has the effects of corrosion resistance, high temperature resistance and excellent stability; the design changes the proportion of the components through fewer components, so that the design has better technical effect compared with the prior art;
5. the design of the screw sealing layer of the invention and the combination of the black silicon carbide and the zirconia fiber ensure that the screw sealing layer has the advantages of stable high-temperature chemical property, corrosion resistance, oxidation resistance, thermal shock resistance, non-volatility and no pollution.
Drawings
FIG. 1 is a schematic view of an anticorrosion structure at a joint of a chimney and a steel substrate flue (a part except the bottom);
FIG. 2 is a schematic view (bottom) of an anticorrosion structure at a joint of a chimney and a steel substrate flue;
in the figure: the concrete chimney comprises a steel flue base body 1, a concrete chimney base body 2, a silica gel filling layer 3, a flexible filling layer 4, a fluororubber skin 6, a fixing bolt 7, a nut 8, a stabilizing screw 9, an anticorrosive material layer 10, a screw sealing layer 11, an FRP (fiber reinforced plastic) batten 12, a vitrified ceramic tile 13 and an intersection seam 14.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The utility model provides a chimney and steel substrate flue handing-over seam anticorrosive coating structure, as shown in fig. 1-2, the anticorrosive coating structure is located between steel flue base member 1 and the concrete chimney base member 2 and on the inboard lateral wall thereof, the anticorrosive coating structure is including locating the silica gel filling layer 3 in the handing-over seam 14 between steel flue base member 1 and the concrete chimney base member 2, flexible filling layer 4 and fluororubber covering 6 are attached to the top of silica gel filling layer 3 in proper order, flexible filling layer 4 is laminated in silica gel filling layer 3, the one end of flexible filling layer 4 and fluororubber covering 6 is all attached in steel flue base member 1, and the other end is all attached in concrete chimney base member 2 to make the clearance between steel flue base member 1 and the concrete chimney base member 2 sealed.
Elastic silica gel is filled in the joint seam 14 to form a silica gel filling layer 3 which is used as an anticorrosive layer structure of the flue base body, corrosion of various acid liquor in the flue can be resisted, the durability is good, the extension performance is good, damage caused by deformation of the flue can be effectively resisted, the acid liquor is prevented from leaking out of the flue to cause pollution, the flexible filling layer 4 and the fluororubber skin 6 are arranged above the silica gel filling layer 3, and two ends of the flexible filling layer and two ends of the fluororubber skin are respectively fixed on the steel flue base body 1 and the concrete flue base body 2, so that the first silica gel layer filling layer is given a certain flexibility, the silica gel filling layer 3 is prevented from being broken, the whole anticorrosive layer structure is prevented from being cracked. The design can fully resist thermal expansion, cold and vibration, the overall performance is good, the silica gel filling layer 3, the flexible filling layer 4 and the fluororubber skin 6 are combined to serve as an anticorrosive layer structure of a flue base body, corrosion of various acid liquids in a flue can be resisted, the durability is good, the extension performance is good, and damage caused by deformation of the flue can be effectively resisted. The three-layer design is organically combined and stably connected with the steel flue base body 1 and the anti-corrosion material layer 10 of the concrete flue base body, so that the anti-corrosion material layer has good protective performance, the stability and the reliability of the anti-corrosion layer structure are guaranteed, the service life is long, and the maintenance cost is low.
Example 2
Based on the embodiment 1, a silica gel filling layer 7 is arranged between the flexible filling layer 4 and the fluororubber skin 6 which are close to the steel flue base body 1 and the concrete flue base body 2, a fixing bolt 8 and a nut 9 are arranged on the silica gel filling layer 7 which is close to the steel flue base body 1, and a stabilizing screw 10 is arranged on the silica gel filling layer 7 which is close to the concrete flue base body 2. The design of silica gel filling layer 7 improves the fixed stability of flexible filling layer 4 and fluororubber skin 6, and makes the side of fluororubber skin 6 and the side of anticorrosive material layer 11 on same water flat line, and the follow-up installation screw material layer of being convenient for avoids leaving the clearance, prevents that the acidizing fluid from invading the corruption.
Example 3
Based on the embodiment 2, the inner side walls of the steel flue base body 1 and the concrete flue base body 2 are also provided with the anticorrosive material layer 10.
And screw sealing layers 11 are arranged above the fixing bolts 7 and the stabilizing screws 9, one end of each screw sealing layer 11 is attached to the anticorrosive material layer 10, and the other end of each screw sealing layer is attached to the fluororubber skin 6. The screw sealing layers 11 are arranged on the surfaces of the fixing bolts 7 and the stabilizing screws 9, so that the fixing bolts 7 and the stabilizing screws 9 are prevented from being corroded by acidic liquid in a flue, and the service life of the fixing bolts is prolonged.
And FRP pressing strips 12 are arranged at positions close to the fixing bolts 7 and the stabilizing screws 9. The fixing bolt 7 and the stabilizing screw 9 penetrate through the FRP pressing strip 12 to be connected to the steel flue base body 1 and the concrete flue base body, and the FRP pressing strip 12 is attached to the upper surface of the flexible filling layer 4. By adopting the structure, the FRP pressing strip 12 is padded under the fixing bolt 7 and the stabilizing screw 9, so that the stabilizing screw 9 can press the flexible filling layer 4 more tightly, the flexible filling layer 4 cannot be damaged, the protective layer structure is more stable and reliable, and the corrosion resistance is better.
And vitrified ceramic tiles 13 are arranged on the outer sides of the screw sealing layer 11 and the fluororubber skin 6. The vitrified ceramic tiles 13 and the fluororubber skin 6 are filled and sealed through the flexible filling layer 4.
Example 4
Based on embodiment 3, the preparation method of the anticorrosive coating structure of the joint seam between the chimney and the steel substrate flue comprises the following steps:
1) preparing a layer of anti-corrosive material 10, comprising the steps of:
a, coating a silicon carbide coating layer on the outer wall of a steel flue substrate 1, wherein the silicon carbide coating layer comprises green silicon carbide and organic silicon resin as raw materials; the raw materials of the silicon carbide coating layer comprise 16 parts of green silicon carbide and 20 parts of organic silicon resin in parts by weight;
b, coating a mixed coating layer on the outer wall of the silicon carbide coating layer, wherein the raw materials of the mixed coating layer comprise silicon carbide, graphene, zirconium oxide and organic silicon resin; the raw materials of the mixed coating layer comprise, by weight, 5 parts of green silicon carbide, 3 parts of graphene, 16 parts of tetragonal zirconia and 30 parts of organic silicon resin;
2) the side walls of the steel flue base body 1 and the concrete flue base body 2 are coated with an anticorrosive material layer 10;
3) filling a gap between the steel flue base body 1 and the concrete flue base body 2 with the silica gel filling layer 3;
4) the flexible filling layer 4 and the fluororubber skin 6 are sequentially arranged above the silica gel filling layer 3, and the silica gel filling layer 3 is arranged below the fluororubber skin 6 close to the steel flue base 1 and the concrete flue base 2, so that the upper surfaces of two ends of the fluororubber skin 6 are flush with the anticorrosive material layer 10;
5) FRP (fiber reinforced plastic) battens 12 are respectively padded under the fixing bolt 7 and the stabilizing screw 9, so that one ends of the flexible filling layer 4 and the fluororubber skin 6 are fixed above the steel flue base body 1 by the fixing bolt 7, and the other ends of the flexible filling layer 4 and the fluororubber skin 6 are fixed above the concrete flue base body 2 by the stabilizing screw 9;
6) preparing the screw sealing layer 11, including the steps of:
a: at ZrO (C)3H7)4Adding alcohol and water, adding acid as a catalyst, mixing, starting hydrolysis reaction, finally forming sol, and then carrying out polymerization reaction to obtain gel;
b: drying and spinning part of the gel, then heating at the high temperature of 750 ℃, and performing inorganic treatment to prepare zirconia fiber;
c: mixing the residual gel with black silicon carbide, coating the mixture on the surface of zirconia fiber, attaching the mixture above a fixing bolt 7 and a stabilizing screw 9, and respectively attaching two sides of the zirconia fiber to the outer sides of an anticorrosive material layer 10 and a fluororubber skin 6.
Example 5
In the embodiment, the raw materials of the silicon carbide coating layer comprise 15 parts by weight of green silicon carbide and 20 parts by weight of organic silicon resin; the raw materials of the mixed coating layer comprise 4 parts of green silicon carbide, 2 parts of graphene, 12 parts of tetragonal zirconia and 30 parts of organic silicon resin in parts by weight; the remaining steps and parameters were in accordance with example 4.
Example 6
In the embodiment, the raw materials of the silicon carbide coating layer comprise 20 parts by weight of green silicon carbide and 22 parts by weight of organic silicon resin; the raw materials of the mixed coating layer comprise 6 parts of green silicon carbide, 6 parts of graphene, 18 parts of tetragonal zirconia and 32 parts of organic silicon resin in parts by weight; the remaining steps and parameters were in accordance with example 4.
Comparative example 1
In the comparative example, the raw materials of the silicon carbide coating layer comprise 10 parts by weight of green silicon carbide and 30 parts by weight of organic silicon resin; the raw materials of the mixed coating layer comprise 2 parts of green silicon carbide, 4 parts of graphene, 4 parts of tetragonal zirconia and 10 parts of organic silicon resin in parts by weight; the remaining steps and parameters were in accordance with example 4.
Comparative example 2
In the comparative example, the raw materials of the silicon carbide coating layer are black silicon carbide and organic silicon resin; the raw materials of the mixed coating layer are black silicon carbide, graphene, monoclinic zirconia and organic silicon resin; the remaining steps and parameters were in accordance with example 4.
Comparative example 3
In the comparative example, no black silicon carbide was added to the gel of the screw sealing layer; the remaining steps and parameters were in accordance with example 4.
Comparative example 4
In the comparative example, the outer wall of the steel flue substrate is not coated with the silicon carbide coating layer; the remaining steps and parameters were in accordance with example 4.
The coatings of the present invention prepared in examples 4 to 6 and the coatings of comparative examples 1 to 4 were used for chimneys, and the following properties were measured, and the results are shown in table 1:
TABLE 1
From the above table, the anticorrosive material coating and the structure thereof prepared by the embodiment of the invention have the advantages of simple structure, convenient and fast use, good anticorrosive effect, capability of overcoming the defect of matrix deformation, capability of preventing acid liquor corrosion and flue gas scouring, good anticorrosive performance, difficult damage, long service life, low cost, good wear resistance, capability of effectively preventing the influence of expansion with heat and contraction with cold, acid liquor corrosion and flue gas scouring and the like under the influence of interaction of various raw materials and specific structural design.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The utility model provides a chimney and steel base body flue handing-over seam anticorrosive coating structure, its characterized in that, the anticorrosive coating structure is located between steel flue base member (1) and concrete chimney base member (2) and on the inboard lateral wall thereof, the anticorrosive coating structure is including locating silica gel filling layer (3) in handing-over seam (14) between steel flue base member (1) and concrete chimney base member (2), the top of silica gel filling layer (3) is pasted in proper order with flexible filling layer (4) and fluororubber covering (6), flexible filling layer (4) are laminated in silica gel filling layer (3), the one end of flexible filling layer (4) and fluororubber covering (6) all attached in steel flue base member (1), and the other end all attaches in concrete chimney base member (2) to make the clearance seal between steel flue base member (1) and concrete chimney base member (2).
2. The chimney and steel substrate flue joint anticorrosive coating structure according to claim 1, characterized in that a silica gel filling layer (3) is arranged below the fluororubber skin (6) close to the steel flue substrate (1) and the concrete chimney substrate (2), a fixing bolt (7) and a nut (8) are arranged on the silica gel filling layer (3) close to the steel flue substrate (1), and a stabilizing screw (9) is arranged on the silica gel filling layer (3) close to the concrete chimney substrate (2).
3. The chimney and steel substrate flue joint anticorrosive coating structure according to claim 2, characterized in that the inner side walls of the steel flue substrate (1) and the concrete chimney substrate (2) are further provided with an anticorrosive material layer (10).
4. The chimney and steel substrate flue joint anticorrosive coating structure according to claim 3, wherein a screw sealing layer (11) is arranged above the fixing bolt (7) and the stabilizing screw (9), one end of the screw sealing layer (11) is attached to the anticorrosive material layer (10), and the other end of the screw sealing layer is attached to the fluororubber skin (6).
5. The chimney and steel matrix flue joint anticorrosive coating structure according to claim 4, characterized in that FRP battens (12) are arranged near the fixing bolts (7) and the stabilizing screws (9).
6. The chimney and steel matrix flue joint anticorrosion layer structure is characterized in that vitrified ceramic tiles (13) are arranged on the outer sides of the screw sealing layer (11) and the fluororubber skin (6).
7. The preparation method of the corrosion prevention layer structure of the joint of the chimney and the steel substrate flue according to claim 5, characterized by comprising the following steps:
1) the side walls of the steel flue base body (1) and the concrete chimney base body (2) are coated with an anticorrosive material layer (10);
2) filling a gap between the steel flue base body (1) and the concrete chimney base body (2) with the silica gel filling layer (3);
3) sequentially placing a flexible filling layer (4) and a fluororubber skin (6) above a silica gel filling layer (3), and arranging the silica gel filling layer (3) below the fluororubber skin (6) at the positions close to the steel flue base body (1) and the concrete chimney base body (2) so as to enable the upper surfaces of two ends of the fluororubber skin (6) to be level with the anticorrosive material layer (10);
4) FRP (fiber reinforced plastic) battens (12) are respectively padded under the fixing bolt (7) and the stabilizing screw (9), so that the fixing bolt (7) fixes one ends of the flexible filling layer (4) and the fluororubber skin (6) above the steel flue base body (1), and the stabilizing screw (9) fixes the other ends of the flexible filling layer (4) and the fluororubber skin (6) above the concrete chimney base body (2);
5) and a screw sealing layer (11) is pasted on the outer sides of the fixing bolt (7) and the stabilizing screw (9).
8. The preparation method of the corrosion-resistant layer structure of the joint of the chimney and the steel substrate flue according to claim 7, wherein the preparation method of the corrosion-resistant material layer (10) comprises the following steps:
1) the outer wall of the steel flue substrate (1) is coated with a silicon carbide coating layer, and raw materials of the silicon carbide coating layer comprise green silicon carbide and organic silicon resin;
preferably, the raw materials of the silicon carbide coating layer comprise 15-20 parts of green silicon carbide and 20-22 parts of organic silicon resin in parts by weight;
2) the outer wall of the silicon carbide coating layer is coated with a mixed coating layer, and the raw materials of the mixed coating layer comprise silicon carbide, graphene, zirconia and organic silicon resin;
preferably, the raw materials of the mixed coating layer comprise, by weight, 4-6 parts of silicon carbide, 2-6 parts of graphene, 12-18 parts of zirconium oxide and 30-32 parts of organic silicon resin;
preferably, the silicon carbide is green silicon carbide, and the zirconia is tetragonal zirconia.
9. The preparation method of the corrosion prevention layer structure of the chimney and steel substrate flue joint seam according to claim 8 is characterized in that the preparation method of the screw sealing layer (11) comprises the following steps:
1) at ZrO (C)3H7)4Adding alcohol and water, adding acid as a catalyst, mixing, starting hydrolysis reaction, finally forming sol, and then carrying out polymerization reaction to obtain gel;
2) drying and spinning part of the gel, and then heating at the high temperature of 700-800 ℃ for inorganic treatment to prepare zirconia fiber;
3) and mixing the residual gel with black silicon carbide, coating the mixture on the surface of the zirconia fiber, attaching the mixture to the upper parts of the fixing bolt (7) and the stabilizing screw (9), and respectively attaching the two sides of the zirconia fiber to the outer sides of the anticorrosive material layer (10) and the fluororubber skin (6).
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Application publication date: 20201204 |