CN115821253A - Method for manufacturing pipe row strengthening layer of garbage incinerator - Google Patents
Method for manufacturing pipe row strengthening layer of garbage incinerator Download PDFInfo
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- CN115821253A CN115821253A CN202211512351.1A CN202211512351A CN115821253A CN 115821253 A CN115821253 A CN 115821253A CN 202211512351 A CN202211512351 A CN 202211512351A CN 115821253 A CN115821253 A CN 115821253A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method for manufacturing a reinforced layer of a tube bank of a garbage incinerator, which comprises the following steps: s1, mixing nickel-based self-fluxing powder with water glass according to a volume ratio of 2.5-2; s2, carrying out sand blasting on the surface of the pipe array to form a sand blasting surface convenient to attach, wherein the sand blasting pressure during sand blasting is 0.7-0.9 MPa, the sand blasting material is quartz sand with the particle size of 0.1-0.5 mm, the sand blasting distance is 150-190mm, and after sand blasting, carrying out gas purging on the sand blasting surface; s3, uniformly coating the paste-shaped pre-dressing on the sand blasting surface, and drying to form a pre-coating layer, wherein the drying temperature is 120-160 ℃, and the drying time is 50-90min; s4, carrying out induction remelting on the tube bank with the precoating layer in a nitrogen atmosphere to change the precoating layer into a strengthening layer which is metallurgically bonded with the sand blasting surface; when the method is adopted to manufacture the strengthening layer, the heat input is uniform, the pipe wall is not easy to deform, the cost is low, the efficiency is high, the combination effect of the strengthening layer and the surface of the pipe row is good, and the strengthening layer is not easy to fall off and lose efficacy.
Description
Technical Field
The invention belongs to the technical field of manufacturing of strengthening layers, and particularly relates to a manufacturing method of a pipe row strengthening layer of a garbage incinerator.
Background
Along with the implementation of the strategy of 'double carbon' in China, the energy industry structure is greatly changed, the traditional energy region mainly using coal faces the serious impact of energy replacement, and for a coal-fired boiler, the use of coal fuel is strictly controlled, so that the garbage incinerator is rapidly developed, and the traditional coal-fired boiler is gradually transformed into the garbage incinerator to complete the adjustment of the energy industry structure.
In the operation process of the garbage incinerator, the corrosion and thinning of the heating surface of the tube bank is a bottleneck problem which restricts the development of the garbage incinerator, and is also a difficult problem which needs to be solved urgently at home and abroad at present. If the wall of the heating surface is not protected, the wall thickness of the pipe is reduced by 30 to 40 percent only in one to two years, pipe explosion accidents are easily caused, the boiler unit is shut down unplanned, large economic loss is caused, and the safety production of a power plant is threatened.
At present, in order to improve the durability of a pipe row, a strengthening layer needs to be arranged on the surface of the pipe row, a common strengthening layer manufacturing method is build-up welding, but the method has high heat input concentration ratio, is easy to cause local deformation of the pipe wall, and also needs high skill level of operators, and has high cost and low efficiency; there is also a method for manufacturing a strengthening layer by thermal spraying, in which a coating material is heated and melted, atomized into ultrafine particles by a high-speed air flow, and sprayed onto a workpiece surface at a high speed to form a coating, and various problems caused by overlay welding can be avoided, but in actual use, since the particles of the coating material after melting are sprayed onto the surface of the tube bank in a particle manner, the finally formed strengthening layer is mechanically combined with the surface of the tube bank, and a layered state is present at the combined surface, and a large number of pores are present in the strengthening layer, further corrosion of corrosive gas on the surface of the tube bank is difficult to be inhibited, and the strengthening layer is easy to peel off due to corrosion of the tube bank, so that the application of the thermal spraying method in a garbage incinerator is limited, and a new treatment means is urgently required for replacement.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the present invention aims to provide a method for manufacturing a reinforced layer of a tube bank of a garbage incinerator, wherein when the reinforced layer is manufactured by the method, heat input is uniform, the tube wall is not easy to deform, cost is low, efficiency is high, the bonding effect of the reinforced layer and the surface of the tube bank is good, and the reinforced layer and the surface of the tube bank are not easy to fall off and lose efficacy.
In order to achieve the purpose, the method in the technical scheme adopted by the invention is a method for manufacturing a reinforced layer of a tube bank of a garbage incinerator, and the method comprises the following steps:
s1, mixing nickel-based self-fluxing powder with water glass according to a volume ratio of 2.5-2;
s2, carrying out sand blasting on the surface of the pipe array to form a sand blasting surface convenient to attach, wherein the sand blasting pressure during sand blasting is 0.7-0.9 MPa, the sand blasting material is quartz sand with the particle size of 0.1-0.5 mm, the sand blasting distance is 150-190mm, and after sand blasting, carrying out gas purging on the sand blasting surface;
s3, uniformly coating the paste-shaped pre-dressing on the sand blasting surface, and drying to form a pre-coating layer, wherein the drying temperature is 120-160 ℃, and the drying time is 50-90min;
and S4, carrying out induction remelting on the tube bank with the precoating layer in a nitrogen atmosphere, and cooling the tube bank to obtain the precoating layer which becomes a strengthening layer metallurgically bonded with the sand blasting surface.
Preferably, when the paste-like pre-dressing is coated in step S3, if the coating thickness is less than or equal to 0.5mm, a single coating is adopted, and if the coating thickness is greater than 0.5mm, multiple coatings are adopted, and drying is performed after each coating.
Preferably, when the paste-like pre-dressing is coated in the step S3, a pseudo-shape scraper is used for scraping, so that the coating thickness of each area of the sand blasting surface is kept consistent.
Preferably, in the step S4, the tube bank is induction-remelted by an induction coil, the current frequency in the induction coil is 6 to 12khz, the power of the induction coil is 100 to 140kw, the distance from the induction coil to the surface of the precoated layer is 6 to 10mm, and the relative moving speed between the induction coil and the tube bank is 1.0 to 1.5mm/S.
Further preferably, when the induction remelting is performed in the step S4, the tube row moves along the length direction thereof relative to the induction coil.
Further preferably, when the induction remelting is performed in step S4, a flowing cooling liquid is introduced into the tube bank, and the flowing direction of the cooling liquid is opposite to the moving direction of the tube bank relative to the induction coil.
Preferably, when the induction remelting is performed in the step S4, the nitrogen pressure applied to the precoat is 0.2 to 0.4mpa.
Preferably, the induction remelting in step S4 adopts the induction remelting device to go on, the induction remelting device includes that the gyro wheel rack, conveying roll row, induction coil, nitrogen gas nozzle, the gyro wheel rack extends along the left and right sides, the conveying roll row includes that a plurality of rotatable erects transfer roller on the gyro wheel rack, the axis of rotation lead of transfer roller extends along the fore-and-aft direction level, induction coil sets up the middle part top that the row was rolled in the conveying, the nitrogen gas nozzle sets up induction coil' S the left and right sides, the nitrogen gas nozzle is aimed at the bank of tubes on the row is rolled in the conveying.
Further preferably, the induction coil is a profiling coil having a shape matching the cross-sectional shape of the tube row.
Further preferably, the induction coil is arranged to move up and down, the induction remelting device further comprises a driving assembly for driving the induction coil to move up and down and a distance sensor for detecting the degree of arching and sinking of the tube row, the driving assembly is electrically connected with the distance sensor and drives the induction coil to move up and down according to the detection value of the distance sensor, so that the distance between the induction coil and the tube row is kept unchanged, the distance sensor is arranged on the left side of the induction coil, and the distance sensor is aligned with the tube row on the conveying rolling row.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. adopt the mixed nickel base of volume ratio 2.5 ~ 2 of 2.5 ~ 2 and water glass to prepare the dressing in advance, can enough make the dressing in advance present the good paste characteristic of department, be convenient for coat on the bank of tubes surface, can make the dressing in advance again contain a large amount of boron element and silicon element, in the response remelting process, utilize boron element and silicon element to play the effect of deoxidization slagging-off, thereby reduce the inside hole of strengthening layer by a wide margin, promote the compactness of strengthening layer, and eliminate the intraformational impurity defect of strengthening as far as possible, simultaneously, when the response remelting, other compositions of water glass can conveniently volatilize, and the residue is few, be difficult to produce the influence to the composition of strengthening layer.
2. Before the dressing in advance is being coated, through carrying out the sandblast to bank of tubes surface, can form comparatively coarse sandblast face, promote the adhesion effect of dressing in advance on bank of tubes surface, avoid drying back precoat because of the adhesive force is not enough to drop, dry after the coating precoat, can get rid of the moisture that contains in the precoat as far as possible, promote the effect that the response is resmelting.
3. When the induction remelting, nitrogen protects, can avoid the strengthening layer to appear oxidizing, the mode of coating the dressing in advance earlier, stoving again, the re-induction remelting also can reduce energy consumption as far as possible to, the process is simple, with low costs, efficient, heat input is even, is difficult to lead to the pipe wall to warp, the strengthening layer hole that finally makes is few, the compactness is high, the strengthening layer can form metallurgical combination with the bank of tubes surface, it is effectual to combine, long-term use is difficult to drop inefficacy.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an electron micrograph of the surface of a tube bank after thermal spraying in the prior art.
FIG. 2 is an electron microscope image of the surface of a tube bank after fabrication of a strengthening layer using the present invention.
FIG. 3 is a schematic view showing the structure of an induction remelting apparatus according to the present invention.
FIG. 4 is a table comparing the performance of a strengthening layer made by prior art thermal spraying and one embodiment of the present invention.
Wherein:
1. conveying the roller row; 2. an induction coil; 3. a tube bank; 4. a nitrogen nozzle; 5. a distance sensor; 6. a roller wheel rack.
Detailed Description
The invention provides a method for manufacturing a reinforced layer of a tube bank of a garbage incinerator, which comprises the following steps:
example one
S1, mixing Ni60 alloy powder and water glass according to a volume ratio of 2:3, and uniformly stirring to obtain a paste-shaped pre-dressing;
s2, conveying the tube bank to a sand blasting room, performing sand blasting on the surface of the tube bank, removing pollutants such as oil stains, oxides and welding slag on the surface of the tube bank, and forming a sand blasting surface convenient to attach, wherein compressed air is used as power gas during sand blasting, the sand blasting pressure is 0.8MPa, sand blasting materials are quartz sand with the particle size of 0.3mm, the sand blasting distance is 180mm, after sand blasting, gas purging is performed on the sand blasting surface, floating ash, sand dust and other impurities on the surface of the tube bank are removed, compressed air is used as power gas during purging, and the purging pressure is 0.8MPa;
s3, uniformly coating the paste pre-coating on a sand blasting surface, wherein the coating thickness is 1mm, the coating times are 2 times, in the coating process, a pseudo-scraper is adopted for blade coating, so that the coating thickness of each area of the sand blasting surface is kept consistent, the pseudo-scraper is designed according to the shape of the cross section of the tube bank, after coating, the tube bank is sent to a baking oven for baking, so that a pre-coating layer is formed, and in the baking process, the baking temperature is 150 ℃, and the baking time is 60min;
s4, carrying out induction remelting on the tube bank with the precoat through an induction coil in a nitrogen atmosphere, wherein the nitrogen pressure applied to the precoat during induction remelting is 0.3MPa, the current frequency in the induction coil is 10KHZ, the power of the induction coil is 120KW, the distance from the induction coil to the surface of the precoat is 8mm, the tube bank moves relative to the induction coil along the length direction of the tube bank, the moving speed is 1.2mm/s, after cooling, the precoat becomes a strengthening layer metallurgically bonded with a sand blasting surface, and the microscopic state of the strengthening layer is shown in figure 2.
The benefit of this arrangement is:
1. the pre-coating material can show good paste characteristics, is convenient to coat on the surface of a tube bank, and can contain a large amount of boron and silicon elements, and the boron and silicon elements are utilized to perform deoxidation and slagging in the induction remelting process, so that the pores in the strengthening layer are greatly reduced, the compactness of the strengthening layer is improved, and the impurity defects in the strengthening layer are eliminated as far as possible.
2. The adhesion effect of the precoating on the surface of the tube bank can be improved, the precoating layer is prevented from falling off due to insufficient adhesion after drying, drying is carried out after the precoating is coated, moisture contained in the precoating layer can be removed as far as possible, and the effect of induction remelting is improved.
3. When the induction remelting, nitrogen protects, can avoid the strengthening layer to appear oxidizing, the mode of coating the dressing in advance earlier, stoving again, the re-induction remelting also can reduce energy consumption as far as possible to, the process is simple, with low costs, efficient, heat input is even, is difficult to lead to the pipe wall to warp, the strengthening layer hole that finally makes is few, the compactness is high, the strengthening layer can form metallurgical combination with the bank of tubes surface, it is effectual to combine, long-term use is difficult to drop inefficacy.
4. As can be seen from the comparison between fig. 1 and fig. 2 and fig. 4, the porosity of the strengthening layer manufactured by the present invention is much smaller than that of the strengthening layer manufactured by the thermal spraying process, and at the same time, the hardness is higher, the bonding strength is better, and the corrosion resistance is better.
Example two
The second embodiment is substantially the same as the first embodiment, except that in the second embodiment, when the induction remelting is performed in the step S4, a flowing cooling liquid, preferably cooling oil, is introduced into the tube bank, and the cooling liquid circulates in the tube bank in a direction opposite to the moving direction of the tube bank relative to the induction coil.
The advantages of such an arrangement are:
1. the heat generated by remelting the tube bank is taken away by the cooling liquid which circularly flows, the temperature of the inner wall of the pipeline in the tube bank is reduced, and the tube bank is prevented from deforming due to high temperature.
2. Because the flow direction of the cooling liquid is opposite to the moving direction of the tube bank, the tube bank which is not moved to the induction coil can be preheated, and the tube bank is prevented from being deformed due to rapid temperature rise.
3. Due to the flowing of the cooling liquid, the whole tube bank can be uniformly cooled during cooling, so that the stress in the tube bank and between the tube bank and the strengthening layer can be eliminated as much as possible.
Furthermore, the flowing cooling liquid is introduced into the tube bank and has pressure of 0.05-0.08MPa.
In the first and second embodiments, the induction remelting in step S4 is performed by using an induction remelting device, as shown in fig. 3, the induction remelting device includes a roller rack 6, a conveying roller bank 1, an induction coil 2, and a nitrogen nozzle 4, the roller rack 6 extends in the left-right direction, the conveying roller bank 1 includes a plurality of conveying rollers rotatably erected on the roller rack 6, the rotation axis of the conveying rollers horizontally extends in the front-back direction, the induction coil 2 is disposed above the middle of the conveying roller bank 1, the nitrogen nozzle 4 is disposed on the left and right sides of the induction coil 2 and located above and below the conveying roller bank 1, and the nitrogen nozzle 4 is aligned with the tube bank 3 on the conveying roller bank 1.
Further, induction coil 2 is the profile modeling coil of shape and bank of tubes 3 cross sectional shape assorted, induction coil 2 can set up with reciprocating, this induction remelting device still includes the drive assembly who is used for driving induction coil 2 and reciprocates, and be used for detecting bank of tubes 3 hunch-up and distance sensor 5 of degree of concavity, drive assembly is connected with distance sensor 5 electricity, and drive induction coil according to the detected value of distance sensor 5 and reciprocate, make the distance between induction coil 2 and the bank of tubes 3 keep unchanged, distance sensor 5 sets up the left side at induction coil 2, distance sensor 5 aims at bank of tubes 3 on the conveying roller 1.
The advantage that sets up like this lies in, can ensure the response remelting effect of bank of tubes, simultaneously, can conveniently realize automated production operation, production efficiency is high.
It should be noted that, in the above induction remelting apparatus, the driving of the conveying roller row may be driven by a motor, and the driving assembly of the induction coil may be implemented by a servo motor and a screw pair, which is not described herein again.
The above-mentioned embodiments are provided only for illustrating the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and to implement the present invention, and not to limit the protection scope of the present invention by this, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. A method for manufacturing a pipe row strengthening layer of a garbage incinerator is characterized by comprising the following steps:
s1, mixing nickel-based self-fluxing powder with water glass according to a volume ratio of 2.5-2;
s2, carrying out sand blasting on the surface of the pipe array to form a sand blasting surface convenient to attach, wherein the sand blasting pressure during sand blasting is 0.7-0.9 MPa, the sand blasting material is quartz sand with the particle size of 0.1-0.5 mm, the sand blasting distance is 150-190mm, and after sand blasting, carrying out gas purging on the sand blasting surface;
s3, uniformly coating the paste-shaped pre-dressing on the sand blasting surface, and drying to form a pre-coating layer, wherein the drying temperature is 120-160 ℃, and the drying time is 50-90min;
and S4, carrying out induction remelting on the tube bank with the precoating layer in a nitrogen atmosphere, and cooling the tube bank to obtain the precoating layer which becomes a strengthening layer metallurgically bonded with the sand blasting surface.
2. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 1, characterized in that: and S3, when the paste-shaped pre-dressing is coated, if the coating thickness is less than or equal to 0.5mm, adopting single coating, and if the coating thickness is greater than 0.5mm, adopting multiple coatings, and drying after each coating.
3. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 1, characterized in that: and S3, when the paste pre-dressing is coated, a pseudo-shape scraper is adopted for blade coating, so that the coating thickness of each area of the sand-blasting surface is kept consistent.
4. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 1, characterized in that: and S4, carrying out induction remelting on the tube bank through an induction coil, wherein the current frequency in the induction coil is 6-12KHZ, the power of the induction coil is 100-140KW, the distance from the induction coil to the surface of the precoated layer is 6-10mm, and the relative movement speed of the induction coil and the tube bank is 1.0-1.5 mm/S.
5. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 4, characterized in that: and S4, when induction remelting is carried out, the tube bank moves relative to the induction coil along the length direction of the tube bank.
6. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 5, characterized in that: and S4, when induction remelting is carried out, flowing cooling liquid is introduced into the tube bank, and the cooling liquid circularly flows in the tube bank in a direction opposite to the moving direction of the tube bank relative to the induction coil.
7. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 1, characterized in that: and S4, when induction remelting is carried out, the nitrogen pressure applied to the precoating layer is 0.2-0.4 MPa.
8. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 1, characterized in that: the induction remelting in step S4 adopts the induction remelting device to go on, the induction remelting device includes that gyro wheel rack, conveying roll row, induction coil, nitrogen gas nozzle, the gyro wheel rack extends along left right direction, the conveying rolls the row and erects including a plurality of rotatable ground the transfer roller on the gyro wheel rack, the axis of rotation lead of transfer roller extends along the fore-and-aft direction level, induction coil sets up the middle part top that the row was rolled in the conveying, the nitrogen gas nozzle sets up induction coil' S the left and right sides, the nitrogen gas nozzle is aimed at the pipe row on the row is rolled in the conveying.
9. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 8, characterized in that: the induction coil is a profiling coil with the shape matched with the cross section shape of the tube bank.
10. The method for manufacturing the reinforced layer of the heating surface of the tube bank of the garbage incinerator according to claim 9, characterized in that: the induction coil can be arranged in a vertically movable mode, the induction remelting device further comprises a driving assembly and a distance sensor, the driving assembly is used for driving the induction coil to move vertically, the distance sensor is used for detecting the arching degree and the sinking degree of the tube bank, the driving assembly is electrically connected with the distance sensor, the induction coil is driven to move vertically according to the detection value of the distance sensor, the distance between the induction coil and the tube bank is kept unchanged, the distance sensor is arranged on the left side of the induction coil, and the distance sensor is aligned with the tube bank on the conveying rolling bank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211512351.1A CN115821253A (en) | 2022-11-29 | 2022-11-29 | Method for manufacturing pipe row strengthening layer of garbage incinerator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211512351.1A CN115821253A (en) | 2022-11-29 | 2022-11-29 | Method for manufacturing pipe row strengthening layer of garbage incinerator |
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| CN115821253A true CN115821253A (en) | 2023-03-21 |
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| CN202211512351.1A Pending CN115821253A (en) | 2022-11-29 | 2022-11-29 | Method for manufacturing pipe row strengthening layer of garbage incinerator |
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| CN (1) | CN115821253A (en) |
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- 2022-11-29 CN CN202211512351.1A patent/CN115821253A/en active Pending
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