CN210511615U - Boiler header pipe seat for 600-plus-620-DEG C steam temperature thermal power generating unit - Google Patents
Boiler header pipe seat for 600-plus-620-DEG C steam temperature thermal power generating unit Download PDFInfo
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- CN210511615U CN210511615U CN201921354691.XU CN201921354691U CN210511615U CN 210511615 U CN210511615 U CN 210511615U CN 201921354691 U CN201921354691 U CN 201921354691U CN 210511615 U CN210511615 U CN 210511615U
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- 238000005269 aluminizing Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 7
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims 1
- 239000012808 vapor phase Substances 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 10
- 238000007254 oxidation reaction Methods 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 238000003466 welding Methods 0.000 description 8
- 239000013078 crystal Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910015372 FeAl Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000004584 weight gain Effects 0.000 description 2
- 235000019786 weight gain Nutrition 0.000 description 2
- 239000004429 Calibre Substances 0.000 description 1
- 229910017372 Fe3Al Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a boiler header tube seat for a thermal power generating unit with steam temperature of 600-620 ℃, which comprises a final superheater outlet header or a final reheater outlet header (1) made of a P92 large-caliber pipe and a header tube seat (2) made of a T92 small-caliber pipe; one end of a header pipe seat (2) is welded with a final superheater outlet header or a final reheater outlet header (1), and the other end of the header pipe seat is welded with a final superheater or a final reheater pipe (3) in a boiler ceiling. The utility model discloses can be in service for a long time 600 and 620 ℃ high temperature steam environment, the anti steam oxidation performance of part has improved 1000 times.
Description
Technical Field
The utility model belongs to the boiler field of making, concretely relates to boiler header tube socket that is used for 600 to increase one's blood pressure and 620 degrees centigrade steam temperature thermal power generating unit.
Background
The P92 steel is a novel heat-resistant steel which is improved by properly reducing the content of Mo element on the basis of P91 steel, simultaneously adding about 1.8% of W and adding trace B, has higher high-temperature endurance strength, fatigue resistance, steam oxidation resistance, processing technology and welding performance, has the highest use temperature of 625 ℃, and is mainly used for a main steam pipeline of an ultra-supercritical unit. Since the Yuhuan power plant # 1 unit is successfully put into commercial operation as the first 1000MW ultra-supercritical unit in China since 2006, P92 steel is a novel heat-resistant steel widely applied to thermal power construction in China in recent years, and a great deal of experience has been accumulated in the aspects of standard design, manufacturing, welding, installation, operation supervision and the like.
In recent years, the maximum steam admission temperature that has been put into commercial operation of a unit has reached 620 degrees celsius. According to the ASME specification, the P92 meets the requirement of high-temperature strength of a header and a pipeline with the steam temperature lower than 620 ℃, but the P92 steel is oxidized when working under the thermal condition, the inner layer of the oxide layer is extremely thin and contains a large amount of oxideCation vacancy CrFe2O4The 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 problem of thickening and falling of the P92 header and pipeline steam side oxide layer is 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.
SUMMERY OF THE UTILITY MODEL
The utility model provides a boiler collection case tube socket that is used for 600 to supplant 620 degree centigrade steam temperature thermal power generating unit makes collection case main part and small-bore tube socket by P92 and T92 heavy-calibre pipe respectively, and the inner wall adopts the calorization to handle to solve the bodiness and the problem that drops of P92 collection case and pipeline steam side oxide layer.
The utility model discloses a following technical scheme realizes:
a boiler header seat for a thermal power generating unit with steam temperature of 600-620 ℃ comprises a final superheater outlet header or a final reheater outlet header made of P92 large-caliber pipes and a header seat made of T92 small-caliber pipes; one end of the header pipe seat is welded with a final superheater outlet header or a final reheater outlet header, and the other end of the header pipe seat is welded with a final superheater or a final reheater pipe in a boiler ceiling.
The utility model discloses a further improvement lies in, the material of final superheater or final reheater pipe is T92, TP347HFG, Super304H or HR3C austenitic stainless steel.
The utility model discloses further improvement lies in, all is provided with the aluminizing layer on the inner wall of final superheater export collection box or final reheater export collection box and header tube socket.
The utility model discloses a further improvement lies in, and the aluminizing layer adopts gas phase aluminizing, powder embedding aluminizing or thick liquids aluminizing to make.
The utility model discloses following profitable technological effect has:
the utility model provides a pair of a boiler header tube seat that is used for 600 to supplant 620 degrees centigrade steam temperature thermal power generating unit uses P92 martensite steel after the calorization to make, and the alloy structure on part surface is turned into FeAl by the martensite looks transformationxAnd (4) phase(s). FeAl relative to the martensite phase of the P92 alloyxThe phases have a lower oxidation rate, and the oxidation products are also converted from the multi-layered Fe-rich oxide to Al2O3. Therefore, the utility model discloses can be for a long time be on duty in 600 + 620 ℃ high temperature steam environment, the anti steam oxidation performance of part has improved 1000 times (fig. 2).
Furthermore, welding materials used for welding the tube seat and the outlet header of the final superheater or the outlet header of the final reheater and welding materials used for welding the tube seat and the superheater or the reheater are P92/T92 alloy welding materials.
Furthermore, an aluminizing process is synchronously implemented in the postweld heat treatment process of the header and the tube seat so as to improve the steam oxidation resistance of the header and the tube seat at the temperature of 600-.
Drawings
FIG. 1 is a schematic view of a header tube seat of a boiler for a thermal power generating unit with steam temperature of 600-620 ℃.
FIG. 2 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 final superheater outlet header or a final reheater outlet header, 2 is a header pipe seat, 3 is a final superheater or a final reheater pipe, 4 is a P92 welding seam, and 5 is an aluminized layer.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The utility model provides a pair of a boiler header tube socket that is used for 600 to supply power 620 degrees centigrade steam temperature thermal power generating unit, as shown in the attached drawing. Wherein: 1 is a final superheater outlet header or a final reheater outlet header, and the material is a P92 large-diameter pipe; 2 is a header pipe seat made of T92 small-caliber pipe (straight pipe or bent pipe); 3 is a final superheater or a final reheater pipe, and the material of the pipe is T92, TP347HFG, Super304H or HR3C austenitic stainless steel; p92 weld line 4; and 5, aluminizing the inner wall.
Taking a pipe seat for designing and manufacturing an outlet header of a final reheater of an ultra-supercritical unit with the steam temperature of 620 ℃ as an example, an outlet header is manufactured by a P92 large-caliber pipe, a header pipe seat is manufactured by a T92 nickel-based alloy small-caliber pipe, and a T92, TP347HFG, Super304H or HR3C austenitic stainless steel small-caliber pipe is used as a final superheater or a final reheater pipe. The part dimensions are calculated according to design parameters.
The designed post-weld heat treatment process of the header and the pipe seat synchronously implements the aluminizing process, the heat treatment process is 760 ℃, and the heat is preserved for 6 hours. The powder aluminizing process is adopted to fill the whole header and the inner space of the pipe seat with the aluminizing agent.
The chemical composition, mechanical properties and maximum required stress of the P92/T92 alloy according to ASME boiler pressure vessel Specification, 2013 edition are shown in tables 1-3:
TABLE 1 chemical composition of P92/T92 Steel
TABLE 2 mechanical Properties of P92/T92
| ASME | Tensile strength | Yield strength | Elongation percentage of% | Hardness, HB |
| CC2179-3 | ≥620MPa | ≥440MPa | ≥20 | ≤250 |
TABLE 3 allowable stress of P92/T92
| 575℃ | 600℃ | 625℃ | 649℃ | |
| P92/T92 | 99.5 | 77.0 | 56.5 | 38.3 |
After the aluminizing process is synchronously implemented in the postweld heat treatment process, the aluminized layer with the thickness equal to 20 microns has a main phase of Fe3Al and the average content of aluminum in the coating is 12 percent (mass fraction). FIG. 2 is a comparison of weight gain of P92 steel after aluminizing and oxidation in 650 ℃ steam for 500h, and it can be seen that after the aluminizing treatment, the oxidation rate of P92 is significantly reduced, the extrapolated thickness of oxide skin does not exceed 1mm in 10 ten thousand hours, and the requirement of long-term service in 650 ℃ steam is met.
According to ASME regulations: the high-temperature strength of the P92/T92 steel meets the use requirement of steam temperature of 620 ℃, and after the inner wall aluminizing treatment, the anti-saturated steam oxidation performance of the P92/T92 steel meets the requirement of 650 ℃ long-term service. Therefore, the utility model discloses a boiler header tube socket for 600 supplyes 620 ℃ steam temperature thermal power generating unit safe and reliable when steam temperature is less than 620 ℃.
Claims (4)
1. A boiler header seat for a thermal power generating unit with steam temperature of 600-620 ℃ is characterized by comprising a final superheater outlet header or a final reheater outlet header (1) made of P92 large-caliber pipes and a header seat (2) made of T92 small-caliber pipes; one end of a header pipe seat (2) is welded with a final superheater outlet header or a final reheater outlet header (1), and the other end of the header pipe seat is welded with a final superheater or a final reheater pipe (3) in a boiler ceiling.
2. The header of a boiler for a thermal power generating unit with steam temperature of 600-620 ℃ according to claim 1, wherein the material of the final superheater or the final reheater tube (3) is T92, TP347HFG, Super304H or HR3C austenitic stainless steel.
3. The boiler header pipe seat for the thermal power generating unit with steam temperature of 600-620 ℃ as claimed in claim 1, wherein the inner walls of the outlet header of the final superheater or the outlet header of the final reheater (1) and the header pipe seat (2) are both provided with aluminized layers (5).
4. The boiler header pipe seat for the thermal power generating unit with steam temperature of 600-620 ℃ as claimed in claim 3, wherein the aluminized layer (5) is made of vapor phase aluminizing, powder embedded aluminizing or slurry aluminizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921354691.XU CN210511615U (en) | 2019-08-20 | 2019-08-20 | Boiler header pipe seat for 600-plus-620-DEG C steam temperature thermal power generating unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921354691.XU CN210511615U (en) | 2019-08-20 | 2019-08-20 | Boiler header pipe seat for 600-plus-620-DEG C steam temperature thermal power generating unit |
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| Publication Number | Publication Date |
|---|---|
| CN210511615U true CN210511615U (en) | 2020-05-12 |
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|---|---|---|---|
| CN201921354691.XU Active CN210511615U (en) | 2019-08-20 | 2019-08-20 | Boiler header pipe seat for 600-plus-620-DEG C steam temperature thermal power generating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397908A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | Boiler header pipe seat for 600-plus-620-DEG C steam temperature thermal power generating unit |
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- 2019-08-20 CN CN201921354691.XU patent/CN210511615U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397908A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | Boiler header pipe seat for 600-plus-620-DEG C steam temperature thermal power generating unit |
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