CN110553253A - Flame retardant coating of air chamber water-cooled wall and coating method thereof - Google Patents
Flame retardant coating of air chamber water-cooled wall and coating method thereof Download PDFInfo
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- CN110553253A CN110553253A CN201910857710.9A CN201910857710A CN110553253A CN 110553253 A CN110553253 A CN 110553253A CN 201910857710 A CN201910857710 A CN 201910857710A CN 110553253 A CN110553253 A CN 110553253A
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- pouring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a fire-resistant layer of a water-cooled wall of an air chamber and a coating method thereof, wherein the coating method of the fire-resistant layer at least comprises the following steps: pouring a fire-resistant layer, namely pouring the prepared fire-resistant material on a position to be constructed of a water-cooled wall of a boiler air chamber in a partition mode according to first preset thickness, length and width based on the size of a region to be constructed, tamping, compacting and forming to finish primary pouring and forming; and pouring the prepared refractory material on the first pouring formed refractory layer in a subarea manner according to the second preset thickness, length and width to finish the second pouring forming. By the disclosed coating method of the fire-resistant layer of the air chamber water-cooled wall, the fire-resistant layer which is matched with the air chamber water-cooled wall in a regional and hierarchical manner is constructed. Thereby promoted the structural strength of boiler plenum water-cooling wall flame retardant coating greatly, avoided appearing when taking place deformation after being heated like traditional flame retardant coating and the unstable condition that concentrates the appearance expansion crack of department of structural strength to influence boiler life's problem.
Description
Technical Field
The invention belongs to the field of construction of a fireproof material of an air chamber water-cooling wall of a circulating fluidized bed, and particularly relates to a fireproof layer of the air chamber water-cooling wall and a coating method thereof.
background
The existing boiler equipment has certain specification requirements on coal used for boilers in the using process. For example, a CFB boiler (HX 480/13.8-ii 2) produced by a company is applied to a heating plant project that uses Ningxia local coal as the boiler coal, and the particle size requirement of the coal as fired is as follows: 0-10mm, d50 ═ 1.5 mm. However, the actual coal as fired has a large particle size deviation, so that the coal particle feeding process and cracks generated by expansion during alternating of cold and heat due to integral casting on the chamber wall are impacted, and the loss speed of the inner wall of the boiler is accelerated.
meanwhile, due to unforeseeable factors such as the abrasion of small holes of an air cap, ash leakage or the abrasion and falling-off phenomena of materials during the long-term operation of the boiler, the abrasion phenomenon generated by the water-cooling air chamber can be accelerated, and therefore higher requirements for the abrasion resistance of the boiler are provided.
Disclosure of Invention
The invention aims to provide a method for coating a fire-resistant layer of a water-cooled wall of an air chamber, which can improve the structural strength of the fire-resistant layer of the water-cooled wall of the air chamber of a boiler aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme:
A fire-resistant layer of a wind chamber water-cooling wall and a coating method thereof are provided, wherein the coating method of the fire-resistant layer at least comprises the following steps: s3: pouring a fire-resistant layer, namely pouring the prepared fire-resistant material on a position to be constructed of a water-cooled wall of a boiler air chamber in a partition mode according to first preset thickness, length and width based on the size of a region to be constructed, tamping, compacting and forming to finish primary pouring and forming; and pouring the prepared refractory material on the first pouring formed refractory layer in a subarea manner according to the second preset thickness, length and width to finish the second pouring forming.
When the fire-resistant layer is poured, uniform partition or block pouring is carried out according to a certain size in the first pouring forming and/or the second pouring forming, so that the pouring areas are mutually independent, and a sufficient expansion space is reserved in the heating expansion process of the pouring areas. Therefore, cracks caused by expansion of the cast-in-one body can not be concentrated in the area with weak structural strength of the cast area, and the service life of the device is influenced. Simultaneously, pour the shaping through twice layering, be favorable to avoiding the gap of flame retardant coating to directly run through whole flame retardant coating to influence boiler wall body's life.
according to a preferred embodiment, expansion gaps are arranged among the pouring areas in the first pouring forming, and the expansion gaps arranged among the areas in the first pouring forming form a plurality of T-shaped structures; expansion gaps are arranged among all the pouring areas in the second pouring forming, and the expansion gaps arranged among all the areas in the second pouring forming form a plurality of T-shaped structures; and the T-shaped structure on the first pouring forming area and the T-shaped structure on the second pouring forming area are not overlapped with each other.
Through the arrangement of the plurality of T-shaped structures in the first pouring forming and/or the second pouring forming, the uniform release of thermal expansion deformation of each pouring area in the plane or curved surface direction is facilitated. Meanwhile, the T-shaped structure formed by casting for the first time and the T-shaped structure formed by casting for the second time are not overlapped, so that the phenomenon that the gap of the fire-resistant layer directly penetrates through the whole fire-resistant layer is further avoided, and the service life of the wall body of the boiler is influenced.
According to a preferred embodiment, the first casting area is provided with a gap with the second casting area. Through this clearance setting, for the first time pour the shaping region and pour the shaping region with the second and expand deformation in the radial direction of boiler and provide the deformation space, the crackle that its inflation caused can concentrate the problem that appears in pouring regional structural strength weak area when having avoided whole pouring.
According to a preferred embodiment, the method for coating a refractory layer further comprises the following steps: s1: and a step of pretreating the inner wall of the boiler, which comprises the step of arranging a plurality of limiting components for limiting the refractory layer at the position to be constructed. The limit component is arranged, so that the relative position between the fire-resistant layer and the boiler wall body is fixed.
According to a preferred embodiment, the surface of the stop member is coated with an asphalt layer. The asphalt layer is arranged on the surface of the limiting component, so that the problem that the structure of the fire-resistant layer is damaged when the fire-resistant layer is heated due to the fact that the expansion coefficient of the metal material is far higher than that of the plastic in the fire-resistant layer is solved.
According to a preferred embodiment, the sum of the first and second predetermined heights is greater than the height of the stop member.
According to a preferred embodiment, the stop member is a heat resistant staple.
According to a preferred embodiment, plywood is provided in the expansion joint. And the separation of each pouring area is completed by arranging the plywood.
According to a preferred embodiment, plywood is arranged in the gap between the first casting area and the second casting area. The separation of the first pouring forming area and the second pouring forming area is completed by arranging the plywood.
According to a preferred embodiment, the method for coating a refractory layer further comprises the following steps: s2: and (3) a refractory material preparation step, namely mixing and stirring the components of the refractory material.
A fire-resistant layer of a water-cooled wall of an air chamber comprises a first pouring forming area which is arranged on the water-cooled wall of the air chamber of a boiler according to a first preset thickness, a first preset length and a first preset width on the basis of the size of an area to be constructed, and a second pouring forming area which is poured on the first pouring forming area according to a second preset thickness, a second preset length and a second preset width; expansion joints are arranged among the sub-areas in the first pouring forming area, and the expansion joints form a plurality of T-shaped structures; expansion joints are arranged among the sub-areas in the secondary pouring forming area, and the expansion joints form a plurality of T-shaped structures; and the T-shaped structure on the first pouring forming area and the T-shaped structure on the second pouring forming area are not overlapped with each other.
The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in the invention, the selection (each non-conflict selection) and other selections can be freely combined. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.
The invention has the beneficial effects that: according to the method for coating the fire-retardant coating of the air chamber water-cooled wall, disclosed by the technical scheme of the invention, the fire-retardant coating which is matched with the air chamber water-cooled wall in a regional and hierarchical manner is constructed on the air chamber water-cooled wall. Thereby promoted the structural strength of boiler plenum water-cooling wall flame retardant coating greatly, avoided appearing when taking place deformation after being heated like traditional flame retardant coating and the unstable condition that concentrates the appearance expansion crack of department of structural strength to influence boiler life's problem.
Drawings
FIG. 1 is a schematic flow chart of the process steps of the present invention.
Detailed Description
the following non-limiting examples serve to illustrate the invention.
Example 1:
Referring to fig. 1, a refractory layer of a water wall of an air chamber and a coating method thereof are disclosed, wherein the coating method of the refractory layer at least comprises the following steps:
s1: and (3) pretreating the inner wall of the boiler. The pretreatment of the inner wall of the boiler comprises the step of arranging a plurality of limiting components for limiting the refractory layer at the position to be constructed. The limit component is arranged, so that the relative position between the fire-resistant layer and the boiler wall body is fixed.
preferably, the surface of the limiting member is coated with an asphalt layer. An expansion space is reserved by arranging an asphalt layer on the surface of the limiting component. The problem that the expansion coefficient of the metal material is far higher than that of the plastic material in the refractory layer, so that the structure of the refractory layer is damaged when the refractory layer is heated is solved.
Preferably, the stop member is a heat resistant staple. For example, the material of the nails can be 12Cr 13.
Further, the limiting member is welded on the inner wall of the boiler. The welding must be firm, and the crackle is forbidden strictly to prevent the heat-resisting layer of pouring from appearing expend with heat and contract with cold and leading to the problem that stop member fracture drops in the operation.
Preferably, the heat resistant staples comprise wall pins and Y-shaped staples.
S2: and (3) preparing a refractory material. And mixing and stirring the components of the refractory material.
Preferably, the refractory material in step S2 is made of plastic. The plastic material may be any of the commercially available products, or may be prepared by the following preferred embodiments. The mixing process comprises the steps of adopting phosphate, corundum and mullite and ultrafine powder ingredients. The phosphate binder, the coagulant and the admixture are added on site as required.
Preferably, the refractory preparation in step S2 further includes a material smoldering process. The material sealing process is to pour the combined aggregate and the additive into a stirrer according to the proportion requirement, stir the materials with consistent color, add the weighed phosphate binder, continue stirring (the adding amount of the phosphate binder is about 6-7% of the weight of the materials), and seal the materials after stirring uniformly. When the material is sealed, the material needs to be sealed to prevent the phosphate binder from volatilizing, and the material sealing time needs to be longer than 24 hours.
Preferably, the preparation of the refractory material in the step S2 further includes adding the stuffy material into a stirrer, adding a coagulant, stirring, adding a phosphate binder for continuous stirring when the stirring color is consistent, and stirring for 3-5 minutes to complete the preparation of the refractory material.
S3: and (5) pouring a refractory layer. And the pouring of the fire-resistant layer comprises the steps of pouring the prepared fire-resistant material on the position, to be constructed, of the water-cooled wall of the boiler air chamber in a partition mode according to first preset thickness, length and width based on the size of the area to be constructed, tamping, compacting and forming, and finishing the first pouring and forming. And pouring the prepared refractory material on the first pouring formed refractory layer in a subarea manner according to the second preset thickness, length and width to finish the second pouring forming.
When the fire-resistant layer is poured, uniform partition or block pouring is carried out according to a certain size in the first pouring forming and/or the second pouring forming, so that the pouring areas are mutually independent, and a sufficient expansion space is reserved in the heating expansion process of the pouring areas. Therefore, cracks caused by expansion of the cast-in-one body can not be concentrated in the area with weak structural strength of the cast area, and the service life of the device is influenced. Simultaneously, pour the shaping through twice layering, be favorable to avoiding the gap of flame retardant coating to directly run through whole flame retardant coating to influence boiler wall body's life.
Preferably, the sum of the first preset height and the second preset height is greater than the height of the limiting component. In fact, the pouring thickness of the fire-resistant layer is larger than the height of the limiting component, so that the limiting component is poured into the fire-resistant layer to complete the protection of the limiting component. Meanwhile, the structural stability between the fire-resistant layer and the wall body of the boiler is ensured.
Further, the first predetermined length and the width have the same value, which is 600 mm. The second predetermined length and width values are less than the first predetermined length or width. So that the second pouring forming area is divided into more fine areas, and enough expansion space is reserved for the material to expand when heated.
Furthermore, expansion gaps are arranged among all pouring areas in the first pouring forming, and the expansion gaps arranged among all the areas in the first pouring forming form a plurality of T-shaped structures. Expansion gaps are arranged among all the pouring areas in the second pouring forming, and the expansion gaps arranged among all the areas in the second pouring forming form a plurality of T-shaped structures; and the T-shaped structure on the first pouring forming area and the T-shaped structure on the second pouring forming area are not overlapped with each other.
Through the arrangement of the plurality of T-shaped structures in the first pouring forming and/or the second pouring forming, the uniform release of thermal expansion deformation of each pouring area in the plane or curved surface direction is facilitated. Meanwhile, the T-shaped structure formed by casting for the first time and the T-shaped structure formed by casting for the second time are not overlapped, so that the phenomenon that the gap of the fire-resistant layer directly penetrates through the whole fire-resistant layer is further avoided, and the service life of the wall body of the boiler is influenced.
Furthermore, plywood is arranged in the expansion joint. And the separation of each pouring area is completed by arranging the plywood.
Preferably, a gap is formed between the first pouring forming area and the second pouring forming area. And through this clearance setting, for first time pour the shaping region and pour the shaping region with the second and pour the deformation and provide the deformation space in the radial direction of boiler inflation, the problem that the crackle that its inflation caused can concentrate to appear in pouring regional structural strength weak area when having avoided whole pouring.
Furthermore, a gap between the first pouring forming area and the second pouring forming area is provided with a plywood. The separation of the first pouring forming area and the second pouring forming area is completed by arranging the plywood.
The coating method of the fire-resistant layer of the air chamber water-cooling wall is used for simultaneously preparing the fire-resistant layer of the air chamber water-cooling wall. The fire-resistant layer comprises a first pouring forming area which is arranged on the water-cooled wall of the boiler air chamber in a partition mode according to a first preset thickness, length and width based on the size of an area to be constructed, and a second pouring forming area which is poured on the first pouring forming area in a partition mode according to a second preset thickness, length and width; expansion joints are arranged among the sub-areas in the first pouring forming area, and the expansion joints form a plurality of T-shaped structures; expansion joints are arranged among the sub-areas in the secondary pouring forming area, and the expansion joints form a plurality of T-shaped structures; and the T-shaped structure on the first pouring forming area and the T-shaped structure on the second pouring forming area are not overlapped with each other.
According to the method for coating the fire-retardant coating of the air chamber water-cooled wall, disclosed by the technical scheme of the invention, the fire-retardant coating which is matched with the air chamber water-cooled wall in a regional and hierarchical manner is constructed on the air chamber water-cooled wall. Thereby promoted the structural strength of boiler plenum water-cooling wall flame retardant coating greatly, avoided appearing when taking place deformation after being heated like traditional flame retardant coating and the unstable condition that concentrates the appearance expansion crack of department of structural strength to influence boiler life's problem.
The foregoing basic embodiments of the invention and their various further alternatives can be freely combined to form multiple embodiments, all of which are contemplated and claimed herein. In the scheme of the invention, each selection example can be combined with any other basic example and selection example at will. Numerous combinations will be known to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. a method for coating a fire-resistant layer of a water-cooled wall of an air chamber is characterized by at least comprising the following steps:
s3: pouring a fire-resistant layer, namely pouring the prepared fire-resistant material on a position to be constructed of a water-cooled wall of a boiler air chamber in a partition mode according to first preset thickness, length and width based on the size of a region to be constructed, tamping, compacting and forming to finish primary pouring and forming; and pouring the prepared refractory material on the first pouring formed refractory layer in a subarea manner according to the second preset thickness, length and width to finish the second pouring forming.
2. The fire-resistant layer of the plenum water-cooled wall and the coating method thereof according to claim 1, wherein expansion gaps are arranged among the casting areas in the first casting, and the expansion gaps arranged among the casting areas in the first casting form a plurality of T-shaped structures;
Expansion gaps are arranged among all the pouring areas in the second pouring forming, and the expansion gaps arranged among all the areas in the second pouring forming form a plurality of T-shaped structures;
And the T-shaped structure on the first pouring forming area and the T-shaped structure on the second pouring forming area are not overlapped with each other.
3. The refractory lining for a water cooled wall of a plenum of claim 1, wherein the first cast molding zone is spaced from the second cast molding zone.
4. The fire resistant layer for a water wall of a plenum of claim 1 and the method of coating the fire resistant layer further comprising the steps of:
S1: and a step of pretreating the inner wall of the boiler, which comprises the step of arranging a plurality of limiting components for limiting the refractory layer at the position to be constructed.
5. The fire resistant layer for a water cooled wall of a plenum of claim 4 and method of coating the same, wherein the surface of the stop member is coated with an asphalt layer.
6. The flame retardant coating for a plenum waterwall of claim 4 and method of coating same, wherein the sum of said first predetermined height and said second predetermined height is greater than the height of said stop member.
7. The fire resistant layer of a plenum waterwall of claim 4 and method of coating the same wherein said stop member is a heat resistant clinch nail.
8. The fire resistant layer of a plenum water wall and the method of coating the same of claim 2, wherein a plywood is disposed in the expansion joint;
and a plywood is arranged in a gap between the first pouring forming area and the second pouring forming area.
9. The fire resistant layer for a water wall of a plenum of claim 1 and the method of coating the fire resistant layer further comprising the steps of:
S2: and (3) a refractory material preparation step, namely mixing and stirring the components of the refractory material.
10. A fire-resistant layer of a water-cooled wall of an air chamber is characterized by comprising a first pouring forming area which is arranged on the water-cooled wall of the air chamber of a boiler according to a first preset thickness, a first preset length and a first preset width on the basis of the size of an area to be constructed, and a second pouring forming area which is poured on the first pouring forming area according to a second preset thickness, a second preset length and a second preset width;
Expansion joints are arranged among the sub-areas in the first pouring forming area, and the expansion joints form a plurality of T-shaped structures;
Expansion joints are arranged among the sub-areas in the secondary pouring forming area, and the expansion joints form a plurality of T-shaped structures;
And the T-shaped structure on the first pouring forming area and the T-shaped structure on the second pouring forming area are not overlapped with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857710.9A CN110553253A (en) | 2019-09-09 | 2019-09-09 | Flame retardant coating of air chamber water-cooled wall and coating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857710.9A CN110553253A (en) | 2019-09-09 | 2019-09-09 | Flame retardant coating of air chamber water-cooled wall and coating method thereof |
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| CN110553253A true CN110553253A (en) | 2019-12-10 |
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| CN201910857710.9A Pending CN110553253A (en) | 2019-09-09 | 2019-09-09 | Flame retardant coating of air chamber water-cooled wall and coating method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012021A (en) * | 2010-11-24 | 2011-04-13 | 四川电力建设三公司 | Circulating fluidized bed boiler wall refractory concrete cast structure and casting method |
| CN204691001U (en) * | 2014-09-02 | 2015-10-07 | 绿建科技集团新型建材高技术有限公司 | Full outsourcing block type cast-in-situ wall inorganic fire Self-thermal-insulation System |
| CN205012283U (en) * | 2015-07-24 | 2016-02-03 | 中国十九冶集团有限公司 | Large-volume concrete blocking body structure in hydraulic tunnel |
| CN206034199U (en) * | 2016-08-29 | 2017-03-22 | 中冶焦耐(大连)工程技术有限公司 | Coke oven coke pusher rail foundation structure |
-
2019
- 2019-09-09 CN CN201910857710.9A patent/CN110553253A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012021A (en) * | 2010-11-24 | 2011-04-13 | 四川电力建设三公司 | Circulating fluidized bed boiler wall refractory concrete cast structure and casting method |
| CN204691001U (en) * | 2014-09-02 | 2015-10-07 | 绿建科技集团新型建材高技术有限公司 | Full outsourcing block type cast-in-situ wall inorganic fire Self-thermal-insulation System |
| CN205012283U (en) * | 2015-07-24 | 2016-02-03 | 中国十九冶集团有限公司 | Large-volume concrete blocking body structure in hydraulic tunnel |
| CN206034199U (en) * | 2016-08-29 | 2017-03-22 | 中冶焦耐(大连)工程技术有限公司 | Coke oven coke pusher rail foundation structure |
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Application publication date: 20191210 |
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