CN210122588U - Preparation device for anti-oxidation coating on inner walls of boiler header and pipe seat - Google Patents
Preparation device for anti-oxidation coating on inner walls of boiler header and pipe seat Download PDFInfo
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- CN210122588U CN210122588U CN201920486374.7U CN201920486374U CN210122588U CN 210122588 U CN210122588 U CN 210122588U CN 201920486374 U CN201920486374 U CN 201920486374U CN 210122588 U CN210122588 U CN 210122588U
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Abstract
The utility model discloses a preparation facilities of boiler collection case and tube socket inner wall oxidation resistant coating can show improvement collection case and tube socket inner wall oxidation resistance. The utility model discloses a vapor deposition's method is at collection case and tube socket inner wall preparation coating, and will sealed collection case and tube socket as the partly of gas circuit, specifically include the heating furnace with, by the collection case and the tube socket of waiting to prepare the inner wall coating, seep agent jar, gas circuit pipe, gas circulating pump, valve, take out/the intercommunication return circuit that exhaust pipe and back pressure valve are constituteed. The final heating temperature and the heat preservation time are set according to the material of the header and the pipe seat and the heat treatment process, so that the anti-oxidation coatings with different thicknesses can be prepared. The utility model discloses equipment is simple, and low in manufacturing cost can show improvement collection case and the anti steam oxidation ability of tube socket, has very high engineering practical value.
Description
Technical Field
The utility model belongs to the technical field of the boiler is made, concretely relates to preparation facilities of boiler collection case and tube socket inner wall oxidation resistant coating.
Background
The header is also called a header, collects or distributes steam-water working media, reduces the conveying connecting pipelines of the working media, and reduces the number of the open holes of the boiler barrel, thereby being beneficial to improving the safety performance of the boiler barrel. In recent years, the steam temperature of the header of the unit which is put into commercial operation reaches 620 ℃, the wall temperature of the header is close to 640 ℃, the steam temperature of the header of the unit which is being designed and developed at 630-650 ℃ is higher, and the header and the pipe seat of the boiler are mostly made of martensite steel, such as P91, P92, G115, P112 and the like, due to the requirements of manufacturing cost, thermal expansion and welding performance. For example, according to ASME regulations, P92 meets the high temperature strength requirements for headers and pipes with steam temperatures below 620 ℃.
However, the martensite heat-resistant steel (such as P92) is oxidized when working under the thermal condition, and the inner layer of the oxide layer is extremely thin CrFe containing a large number of cation vacancies2O4The single-phase grain-boundary-free amorphous structure of (a); the middle layer is thicker CrFe2O4Single-phase fine equiaxed crystals and coarse columnar crystal structures grown on the single-phase fine equiaxed crystals; the outer layer is Fe3O4-Fe2O3Fine equiaxed crystals of (a) and coarse columnar crystal structures grown thereon. The three-layer structure of the oxide layer is formed in sequence, the three-layer structure can only appear in the previous layer (inner layer) or the previous two layers (inner layer and middle layer), or can completely appear, and in each layer of the oxide layer, the Fe in the outer layer3O4-Fe2O3The adhesion of the thick columnar crystal layer to the matrix is the worst, so the peeling of the oxide layer is easy to occur on the outer layer, and the peeled oxide layer flows to each part of the unit along with the working medium and causes the problems of pipe blockage, erosion corrosion and the like. Therefore, from the practical use angle of the power plant, the thickening and falling problems of the steam side oxide layer of the header and the pipeline are solved, and the method has important significance for reducing the occurrence of explosion leakage accidents, prolonging the service life of the pipe and improving the safe operation level of the boiler.
The high-temperature protective coating can provide effective anti-oxidation corrosion protection for metal materials used at high temperature, and is widely applied to the fields of aerospace, energy, petrochemical industry and the like. The development of high-temperature protective coatings on various gas turbine engines for aircraft, ships and ground power generation is typically carried out in 3 stages: first generation thermal diffusion coating, second generation M (M)
Fe, Ni or Co) CrAlY clad; third generation thermal barrier coatings. At present, no coating material design and preparation technology aiming at the boiler header and the tube seat of the power station exists, and the improvement of the steam oxidation resistance of the boiler header and the tube seat is mainly solved by improving the corrosion resistance grade of the alloy. For example, the use of a large number of Super304H and HR3C instead of P92 materials in a 620 ℃ active service manifold block not only increases the manufacturing cost,
meanwhile, potential safety hazards are brought by heterogeneous welding. The problem of steam side oxidation of the header and the pipeline is solved by using a high-temperature coating technology, and the method has obvious economic benefits and engineering significance.
SUMMERY OF THE UTILITY MODEL
To the shortcoming that boiler collection case and tube socket anti steam oxidation ability are not enough, the utility model provides a preparation facilities of boiler collection case and tube socket inner wall oxidation resistant coating can show improvement collection case and tube socket inner wall oxidation resistance.
The utility model discloses a following technical scheme realizes:
a preparation device of an anti-oxidation coating on the inner wall of a boiler header and a tube seat comprises a penetrant tank, a gas circulating pump, a header for heating the inner wall coating to be prepared, a first heating furnace of the tube seat and a second heating furnace for heating the penetrant tank; wherein the content of the first and second substances,
the permeating agent tank is communicated to the first heating furnace through the gas path guide pipe and the fifth valve, a pumping/exhausting pipeline is arranged at the outlet of the first heating furnace, a second valve, a third valve and a back pressure valve are sequentially arranged on the pumping/exhausting pipeline, a branch is arranged on the pipeline between the second valve and the third valve, the branch is provided with the first valve, a branch communicated with the back pressure valve is further arranged on the pumping/exhausting pipeline, and a fourth valve, a gas circulating pump and a sixth valve are arranged on the branch and communicated to the gas path guide pipe.
The utility model discloses further improvement lies in, and first heating furnace and second heating furnace are electrical heating, gas or fuel heating furnace, and the heating furnace samming area space is greater than respectively and treats the collection case of preparation inner wall coating and the volume of tube socket and oozing agent jar.
The utility model discloses further improvement lies in, treats the collection case of preparation inner wall coating and the inner wall of tube socket through deoiling, rust cleaning, exposed metal surface.
The further improvement of the utility model lies in that the infiltration agent tank contains 95-99% aluminum alloy powder and 1-5% NH by mass percentage4Cl, and the ratio of the weight of the penetrating agent to the area of the inner walls of the header and the pipe seat is not less than 500g/m2。
The utility model discloses further improvement lies in, and the one end that the gas circuit pipe got into the collection case is sealed, and a plurality of through-holes of pipe wall processing for gaseous phase material evenly diffuses.
A preparation method of an anti-oxidation coating on the inner wall of a boiler header and a tube seat is based on the preparation device of the anti-oxidation coating on the inner wall of the boiler header and the tube seat, and comprises the following steps:
1) closing the second valve, simultaneously opening the third valve, the fifth valve, vacuumizing the pipeline system through the first valve by using a mechanical pump, and closing the first valve, the fourth valve and the sixth valve when the vacuum degree of the system is higher than 1000 Pa;
2) and opening the first heating furnace, and simultaneously heating the header, the tube seat and the impregnation agent tank for preparing the inner wall coating, and keeping the temperature rise curves consistent. Setting final heating temperature and heat preservation time according to the material of the header and the pipe seat and the heat treatment process, wherein the final heating temperature range is 600-;
3) in the heating process, substances in the permeating agent tank are heated and decomposed, the whole header is filled through the through holes on the gas path guide pipe, the pressure is increased, when the system pressure is greater than 1 atmosphere, the second valve and the third valve are opened, overpressure gas is discharged through the second valve, the third valve and the gas pumping/discharging pipeline, and the system pressure value is kept at 1-2MPa by arranging a back pressure valve;
4) after the system pressure is stable at the final heating temperature and under the pressure of 1-2MPa, closing the second valve, the third valve and the fifth valve, closing a second heating furnace for heating the permeating agent tank, and opening the fourth valve, the sixth valve and the gas circulating pump to realize the circulating circulation of the gas under the pressure of 1-2 MPa;
5) and (3) circulating for 2-20h at the final heating temperature and under the pressure of 1-2MPa, closing the first heating furnace, and cutting off the gas path guide pipe and the sealing guide pipe after air cooling of the header and the pipe seat for preparing the inner wall coating to finish the preparation of the anti-oxidation coating on the inner wall of the header and the pipe seat.
The utility model discloses following profitable technological effect has:
a preparation facilities of boiler collection case and tube socket inner wall anti-oxidation coating, the collection case and the tube socket that will treat preparation inner wall coating conduct the utility model discloses a part of device realizes the return circuit through connecting air feed and gas circuit circulation system to reach the purpose of realizing preparing the inner wall coating in specific heat treatment process. Compared with the prior coating preparation technology, the device of the utility model can uniformly prepare the anti-oxidation coating on multiple parts of the header and the tube seat at one time without influencing the welding process of the parts; simultaneously, owing to will wait to prepare the collection case and the tube socket of inner wall coating and do the integration in the utility model discloses in the device, avoided waiting to prepare the collection case and the tube socket of inner wall coating to be heated the tissue degradation scheduling problem that brings many times.
Drawings
FIG. 1 is a schematic view of a device for preparing an antioxidant coating on the inner wall of a boiler header and a tube seat of the utility model.
FIG. 2 is a cross-sectional profile of the coating.
FIG. 3 is a distribution diagram of the main elements of the coating.
FIG. 4 is a graph comparing the weight gain of P92 steel after and after aluminizing by 500h oxidation in steam at 650 ℃.
In the figure: 1 is a first heating furnace, 2 is a header and a pipe seat of an inner wall coating to be prepared, 3 is a penetrating agent tank, 4 is a gas path guide pipe, 5 is a gas circulating pump, 6-11 are first to sixth valves, 12 is an exhaust/exhaust pipeline, 13 is a back pressure valve, and 14 is a second heating furnace.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the apparatus for preparing an antioxidant coating on the inner wall of a boiler header and tube seat of the present invention comprises a penetrant tank 3, a gas circulation pump 5, a first heating furnace 1 for heating the header and tube seat 2 of the inner wall coating to be prepared, and a second heating furnace 14 for heating the penetrant tank 3; the permeating agent tank 3 is communicated to the first heating furnace 1 through an air channel conduit 4 and a fifth valve 10, an exhaust/exhaust pipeline 12 is arranged at the outlet of the first heating furnace 1, a second valve 7, a third valve 8 and a back pressure valve 13 are sequentially arranged on the exhaust/exhaust pipeline 12, a branch is arranged on the pipeline between the second valve 7 and the third valve 8, a first valve 6 is arranged on the branch, a branch communicated with the back pressure valve 13 is further arranged on the exhaust/exhaust pipeline 12, and a fourth valve 9, a gas circulating pump 5 and a sixth valve 11 are arranged on the branch and communicated to the air channel conduit 4.
Wherein, the first heating furnace 1 and the second heating furnace 14 are both electric heating, gas or oil heating furnaces, and the uniform temperature zone spaces of the heating furnaces are respectively larger than the inner wall to be preparedThe header of the coating and the volume of the tube seat 2 and the seeping agent tank 3. The inner walls of the header and the tube seat 2 to be prepared with the inner wall coating are subjected to oil removal and rust removal to expose the metal surface. The penetrating agent tank 3 contains 95-99% of aluminum alloy powder and 1-5% of NH by mass percent4Cl, and the ratio of the weight of the penetrating agent to the area of the inner walls of the header and the pipe seat 2 is not less than 500g/m2. One end of the gas path conduit 4 entering the header is sealed, and a plurality of through holes are processed on the pipe wall for uniformly diffusing gas phase substances.
The utility model discloses a preparation method of boiler header and tube socket inner wall anti-oxidation coating, including following step:
1) closing the second valve 7, simultaneously opening the third to fifth valves 8-10, vacuumizing the pipeline system through the first valve 6 by using a mechanical pump, and closing the first to fourth valves 6-9 and the sixth valve 11 when the vacuum degree of the system is higher than 1000 Pa;
2) and opening the first heating furnace 1, and simultaneously heating the header, the tube seat 2 and the impregnation agent tank 3 for preparing the inner wall coating, so as to keep the temperature rise curves consistent. Setting final heating temperature and heat preservation time according to the material of the header and the pipe seat, wherein the final heating temperature range is 600-950 ℃;
3) in the heating process, substances in the permeating agent tank 3 are heated and decomposed, the whole header is filled through the through hole on the gas path conduit 4, the pressure is increased, when the system pressure is greater than 1 atmosphere, the second valve 7 and the third valve 8 are opened, overpressure gas is discharged through the second valve 7, the third valve 8 and the exhaust/exhaust pipeline 12, and the system pressure value is kept to be 1-2MPa by arranging a back pressure valve 13;
4) after the system pressure is stable at the final heating temperature and under the pressure of 1-2MPa, closing the second valve 7, the third valve 8 and the fifth valve 10, closing the second heating furnace 14 for heating the permeating agent tank 3, and opening the fourth valve 9, the sixth valve 11 and the gas circulating pump 5 to realize the circulating circulation of the gas under the pressure of 1-2 MPa;
5) and (3) circulating for 2-20h at the final heating temperature and under the pressure of 1-2MPa, closing the first heating furnace 1, and cutting off the gas path guide pipe and the sealing guide pipe after the header and the pipe seat 2 for preparing the inner wall coating are air-cooled to finish the preparation of the anti-oxidation coating on the inner wall of the header and the pipe seat.
The utility model relates to a preparation method of an anti-oxidation coating on the inner wall of a boiler header and a pipe seat,
and preparing a coating on the inner walls of the header and the pipe seat by adopting a vapor deposition method, and taking the sealed header and the pipe seat as a part of the gas circuit. The most obvious technical effect is that the coating preparation process is integrated into the box and tube seat material and heat treatment process, so that the problems of tissue degradation and the like caused by repeated heating of the header and the tube seat of the inner wall coating to be prepared are avoided. Because different steel types have different heat treatment processes, the oxidation-resistant coatings with different thicknesses can be prepared by setting the heat treatment temperature and the heat preservation time. The other one of the other technical effects of the utility model lies in, relies on utility model preparation facilities, but furthest's utilization penetrant material obtains the required chemical atmosphere of coating preparation, and through opening and close effective control vapor deposition rate and exhaust emissions of operating flap and circulating pump.
Example one
Preparing an anti-oxidation coating on the inner walls of a header and a pipe seat made of P92 materials, and welding and communicating the header and the pipe seat which are subjected to oil removal and rust removal through the inner walls in a pipeline system. The area of the header and tube seat 2 to be prepared with the inner wall coating is measured to be about 20m215KG penetrant is put into the penetrant tank 3. According to the heat treatment process of the P92 material and the welding seam, the final heating temperature is 760 ℃, and the heat preservation time is 6 h.
The morphology of the prepared inner wall coating is shown in figure 2, and the distribution of main elements of the coating is shown in figure 3.
The weight gain curve of the saturated steam oxidation at 650 ℃ for 500h is shown in FIG. 4.
Claims (3)
1. A preparation device of an anti-oxidation coating on the inner wall of a boiler header and a tube seat is characterized by comprising a penetrant tank (3), a gas circulating pump (5), a first heating furnace (1) for heating the header and the tube seat (2) of which the inner wall coating is to be prepared, and a second heating furnace (14) for heating the penetrant tank (3); wherein the content of the first and second substances,
the infiltration agent tank (3) is communicated to the first heating furnace (1) through the gas path guide pipe (4) and the fifth valve (10), an exhaust pipeline (12) is arranged at the outlet of the first heating furnace (1), a second valve (7), a third valve (8) and a back pressure valve (13) are sequentially arranged on the exhaust pipeline (12), a branch is arranged on the pipeline between the second valve (7) and the third valve (8), the branch is provided with the first valve (6), a branch communicated with the back pressure valve (13) is further arranged on the exhaust pipeline (12), and a fourth valve (9), a gas circulation pump (5) and a sixth valve (11) are arranged on the branch and communicated to the gas path guide pipe (4).
2. The apparatus for preparing the anti-oxidation coating on the inner wall of the boiler header and the tube seat according to claim 1, characterized in that the first heating furnace (1) and the second heating furnace (14) are both electric heating, gas or oil heating furnaces, and the uniform temperature zone space of the heating furnaces is respectively larger than the volumes of the header and the tube seat (2) to be prepared with the inner wall coating and the infiltration agent tank (3).
3. The apparatus for preparing the antioxidation coating on the inner wall of the boiler header and tube seat as claimed in claim 1, wherein one end of the gas path conduit (4) entering the header is sealed, and a plurality of through holes are processed on the tube wall for uniform diffusion of gas phase substances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920486374.7U CN210122588U (en) | 2019-04-11 | 2019-04-11 | Preparation device for anti-oxidation coating on inner walls of boiler header and pipe seat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920486374.7U CN210122588U (en) | 2019-04-11 | 2019-04-11 | Preparation device for anti-oxidation coating on inner walls of boiler header and pipe seat |
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| CN210122588U true CN210122588U (en) | 2020-03-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852923A (en) * | 2019-04-11 | 2019-06-07 | 华能国际电力股份有限公司 | The preparation facilities and method of a kind of boiler header and tube socket inner wall antioxidant coating |
| WO2024087798A1 (en) * | 2022-10-27 | 2024-05-02 | 西安热工研究院有限公司 | Method and apparatus for improving steam oxidation resistance of small-diameter boiler tube of coal-fired boiler |
-
2019
- 2019-04-11 CN CN201920486374.7U patent/CN210122588U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852923A (en) * | 2019-04-11 | 2019-06-07 | 华能国际电力股份有限公司 | The preparation facilities and method of a kind of boiler header and tube socket inner wall antioxidant coating |
| CN109852923B (en) * | 2019-04-11 | 2023-09-19 | 华能国际电力股份有限公司 | Device and method for preparing antioxidant coating on inner wall of boiler header and tube seat |
| WO2024087798A1 (en) * | 2022-10-27 | 2024-05-02 | 西安热工研究院有限公司 | Method and apparatus for improving steam oxidation resistance of small-diameter boiler tube of coal-fired boiler |
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