CN203718739U - Roof tube penetration sealing device for final-stage reheater of boiler - Google Patents
Roof tube penetration sealing device for final-stage reheater of boiler Download PDFInfo
- Publication number
- CN203718739U CN203718739U CN201420082490.XU CN201420082490U CN203718739U CN 203718739 U CN203718739 U CN 203718739U CN 201420082490 U CN201420082490 U CN 201420082490U CN 203718739 U CN203718739 U CN 203718739U
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- China
- Prior art keywords
- roof tube
- tube
- sealing device
- reheater
- boiler
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- Expired - Fee Related
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Abstract
The utility model provides a roof tube penetration sealing device for a final-stage reheater of a boiler. A strong-strength tube is fixedly connected to the penetration position of a roof tube of the reheater, wherein the strong-strength tube is sleeved with a sleeve; a sealing box is welded outside the sleeve. According to the scheme, the sleeve is additionally arranged, so that the expansion stress of a tube bundle is effectively compensated, a stress concentration point is shifted, stress cracking is eliminated, the sealing performance of the sealing box is improved, dust and air leakage is reduced, a function of protecting a final-stage reheating tube by the sleeve of the sealing box is realized, the condition of a heated surface is improved, the service life of equipment is prolonged, the number of non-stop times of a machine unit is reduced, and the maintenance cost can be annually reduced by tens of thousands yuan.
Description
Technical field
The utility model relates to power industry, refers to that especially a kind of boiler final reheater wears roof tube sealing device.
Background technology
In order to improve Generator Set thermal efficiency of cycle, extensively adopt resuperheat circulation., steam turbine high-pressure cylinder acting, deliver in reheater and heat again to improve temperature from boiler superheater main steam out, then send into Steam Turbine Through IP Admission and continue the acting of expanding, be called a resuperheat circulation, can relatively improve cycle efficieny 4～5%.Some large-scale unit is again sent steam discharge back to boiler heating after intermediate pressure cylinder, is called twice resuperheat circulation, 2% left and right that can relatively improve again cycle efficieny.Reheater is in one, to press that heater, the steam-type of its heating are connected on that steam turbine is high, intermediate pressure cylinder expands did the steam after merit, and final reheater is arranged in high-temperature flue gas district.
At present, be in operation for the unit of power plant, final reheater is worn roof tube place, directly welds with furnace roof metal sealing box, in long-term pipe row's in service disturbance, and expands and produces fatigue stress up and down, wears push pipe produce drawing crack in seal box commissure, causes leakage.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of boiler final reheater and wears ceiling sealing device, the problem of leaking to solve existing final reheater.
For solving the problems of the technologies described above, a kind of boiler final reheater that the utility model embodiment provides is worn roof tube sealing device, the Chuan Dingchu that described reheater is worn roof tube is fixedly connected with double-strength pipe, and this double-strength pipe is arranged with sleeve pipe outward, and this sleeve pipe is outer to be welded with a seal box.
Wherein, described seal box comprises the upper sealing panel being sealed connected together, high hat plate and lower seal plate, and described upper sealing panel is provided with circular hole and welds with described sleeve pipe, and the supporting plane of described lower seal plate polishes and welds with roof tube.
Wherein, 1.7 meters of described high strength pipe ranges, material is T91.
Wherein, 100 millimeters of described cover pipe ranges, material is 12Cr1MoV.
The beneficial effect of technique scheme of the present utility model is as follows:
In such scheme; effectively compensated pipe row's swelling stress by setting up sleeve pipe; stress concentration point is shifted, eliminated stress drawing crack, improved the sealing property of seal box; reduced leakage ash leaks out simultaneously; realize the effect of seal box casing protection final stage reheating pipe, improve the general level of the health of heating surface, the also service life of extension device; reduce " non-stopping " number of times of unit simultaneously, and can reduce every year the maintenance cost of tens thousand of units.
Brief description of the drawings
Fig. 1 is the cutaway view that the utility model embodiment boiler final reheater is worn roof tube sealing device.
［ main element symbol description ］
1: seal box;
2: sleeve pipe;
3: reheater tube;
4: newly pipe;
5: upper sealing panel;
6: high hat plate;
7: lower seal plate;
8: roof tube.
Detailed description of the invention
For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The problem that the utility model is revealed for existing final reheater, provides a kind of boiler final reheater to wear roof tube sealing device.
As shown in Figure 1; the utility model embodiment boiler final reheater is worn roof tube sealing device; comprise seal box 1, sleeve pipe 2, reheater tube 3; described seal box 1 comprises upper sealing panel 5, high hat plate 6, lower seal plate 7; described upper sealing panel 5 is provided with circular hole, and the supporting plane of described lower seal plate 7 polishes and welds with roof tube 8, can make seal box 1 and roof tube 8 welding stay close close; sealing effectiveness is better, and described high hat plate 6 plays the effect of protection final reheater.
Described reheater tube 3 is worn the part behind top, exceeds the part of roof tube 8, cuts off the new pipe 4 of 1.7 meters long of rear replacings, and the material of described new pipe 4 is T91, is conducive to argon arc welding welding.Described new pipe 4 outsides are arranged with sleeve pipe 2, can effectively compensate pipe row's swelling stress, and stress concentration point is shifted, and have eliminated stress drawing crack; 100 millimeters of described sleeve pipe 2 length, material is 12Cr1MoV, and is welded on described new pipe 4 by argon arc welding, weldment stress, distortion, crackle tendency that argon arc welding is welded are little.
Install after described sleeve pipe 2, the upper sealing panel of seal box 15 is welded on described sleeve pipe 2, ensure that the lower end of sleeve pipe 2 is far away apart from 30 millimeters of the supporting end faces of height hat plate 6.Certainly, all parts need to detect the integrity of all parts before installing, and the connection of all mouths of pipe all adopts full argon arc welding.
In such scheme; effectively compensated pipe row's swelling stress by setting up sleeve pipe; stress concentration point is shifted, eliminated stress drawing crack, improved the sealing property of seal box; reduced leakage ash leaks out simultaneously; realize the effect of seal box casing protection final stage reheating pipe, improve the general level of the health of heating surface, the also service life of extension device; reduce " non-stopping " number of times of unit simultaneously, and can reduce every year the maintenance cost of tens thousand of units.
The above is preferred embodiment of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (4)
1. boiler final reheater is worn a roof tube sealing device, it is characterized in that, the Chuan Dingchu that described reheater is worn roof tube is fixedly connected with double-strength pipe, and this double-strength pipe is arranged with sleeve pipe outward, and this sleeve pipe is outer to be welded with a seal box.
2. boiler final reheater according to claim 1 is worn roof tube sealing device, it is characterized in that, described seal box comprises the upper sealing panel being sealed connected together, high hat plate and lower seal plate, described upper sealing panel is provided with circular hole and welds with described sleeve pipe, and the supporting plane of described lower seal plate polishes and welds with roof tube.
3. boiler final reheater according to claim 1 is worn roof tube sealing device, it is characterized in that, 1.7 meters of described high strength pipe ranges, and material is T91.
4. boiler final reheater according to claim 1 is worn roof tube sealing device, it is characterized in that, 100 millimeters of described cover pipe ranges, and material is 12Cr1MoV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420082490.XU CN203718739U (en) | 2014-02-25 | 2014-02-25 | Roof tube penetration sealing device for final-stage reheater of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420082490.XU CN203718739U (en) | 2014-02-25 | 2014-02-25 | Roof tube penetration sealing device for final-stage reheater of boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203718739U true CN203718739U (en) | 2014-07-16 |
Family
ID=51157885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420082490.XU Expired - Fee Related CN203718739U (en) | 2014-02-25 | 2014-02-25 | Roof tube penetration sealing device for final-stage reheater of boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203718739U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848195A (en) * | 2015-05-19 | 2015-08-19 | 西安热工研究院有限公司 | Method and system for prevention and treatment of burst leakage of roof pipe of DG2060/17.6-II1 type boiler |
| CN110617469A (en) * | 2019-09-24 | 2019-12-27 | 西安热工研究院有限公司 | Structure for preventing and treating cracking of boiler tube through ceiling sealing part and transformation method |
-
2014
- 2014-02-25 CN CN201420082490.XU patent/CN203718739U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848195A (en) * | 2015-05-19 | 2015-08-19 | 西安热工研究院有限公司 | Method and system for prevention and treatment of burst leakage of roof pipe of DG2060/17.6-II1 type boiler |
| CN110617469A (en) * | 2019-09-24 | 2019-12-27 | 西安热工研究院有限公司 | Structure for preventing and treating cracking of boiler tube through ceiling sealing part and transformation method |
| CN110617469B (en) * | 2019-09-24 | 2021-01-22 | 西安热工研究院有限公司 | Structure for preventing and treating cracking of boiler tube through ceiling sealing part and transformation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20150225 |
|
| EXPY | Termination of patent right or utility model |