CN204240342U - Cfbb - Google Patents
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- CN204240342U CN204240342U CN201420555259.8U CN201420555259U CN204240342U CN 204240342 U CN204240342 U CN 204240342U CN 201420555259 U CN201420555259 U CN 201420555259U CN 204240342 U CN204240342 U CN 204240342U
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- Prior art keywords
- abrasionproof
- screen tube
- water
- water screen
- cfbb
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A kind of CFBB, comprise, water screen tube, water screen tube is provided with water-cooling wall abrasionproof step, described abrasionproof step is sheet metal, there is in the first side of described sheet metal the groove matched with the external diameter of water screen tube, second side relative with described first side is rectilinear form, at the joint of water-cooling wall abrasionproof step and water screen tube, the expansion clearance of preset width is left between described groove and water screen tube, the diameter of described water screen tube 1 is Φ, the thickness of abrasionproof step is h, width is d, the radius of curvature of the groove part engaged with water screen tube is R.
Description
Technical field
The utility model relates to a kind of CFBB, is specifically related to a kind of circulating fluidized bed boiler water-cooling wall Anti-wear Technology, particularly relates to a kind of circulating fluidized bed boiler water-cooling wall abrasionproof step.
Background technology
CFBB preferably resolves the burning of the coal such as sulfur-bearing is high, ash content is large, impurity is many, low heat value and the problem in exhaust pollution etc., there is high heat, the feature that low-temperature stratification burns is closed in strong blending, good to the adaptability of fuel, and can efficient burning be obtained, realize desulfurization and low-nitrogen oxide discharging.
In recent years, fluidized-bed combustion boiler development is very fast, stove is increasing, parameter is more and more higher, but fluidized-bed combustion boiler is due to the feature of self, primarily of coal ash in boiler, unreacted lime stone, the bed material that limestone desulfurization product etc. are formed is in fluidized state under the wind action sent into, coal grain, bed material to be entrained in burner hearth by flue gas with lime stone and to move upward, to fall along burner hearth limit wall at the different height portions bulky grain of burner hearth, the material that these adherent high speeds fall shears collision by being formed the water screen tube of boiler, cause the heavy wear of water screen tube.It seriously constrains its safety, macrocyclic operation, makes fluidized-bed combustion boiler occur unplanned shutdown maintenance frequently, has had a strong impact on the development of CFBB.
For preventing the wearing and tearing of water screen tube, power plant at present more adopts following several anti-wearing method: 1, castable abrasionproof: stamp one deck castable refractory at water screen tube position easy to wear, though this method has certain function of resistance to wearing, but castable upper step place can form larger wearing and tearing, being heated of water screen tube is declined to a great extent simultaneously, have impact on the load of boiler.2, install wearing-resistant tile additional: at the thick wearing-resistant tile of water-cooling wall cambered surface welding 3mm, but watt with watt the fissure of displacement and injustice locate form new eddy current again, accelerate wearing and tearing.Facts have proved, where wearing-resistant tile adds, and which position will form new wearing and tearing, and the gap between water screen tube and wearing-resistant tile constrains radiant heat transfer again.3, spray abrasionproof: spray the thick wearing layer of one deck 1mm in order to abrasionproof on water-cooling wall emulsion zone surface, but sprayed coating edge and sprayed coating come off easily there is wearing and tearing leakage in peeling place.4, abrasionproof beam abrasionproof: at differing heights cast three to four layers of castable refractory of water-cooling wall pipe of burner hearth, form abrasionproof beam, separate material Inner eycle and contact with the direct of water screen tube, in order to eliminate the wearing and tearing of water screen tube.Due to the castable used, the abrasionproof beam width of shaping is greater than 200mm, and thickness is greater than 120mm, has had a strong impact on being heated of water screen tube, makes boiler load decline 20-30%, and the eddy current at corner place is not eliminated simultaneously, and wearing and tearing still exist.
Summary of the invention
The purpose of this utility model is: solve shortcomings and deficiencies of the prior art, provides a kind of novel circulating fluidized bed boiler water-cooling wall Anti-wear Technology, is specifically related to a kind of circulating fluidized bed boiler water-cooling wall abrasionproof step.For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of CFBB, comprise, water screen tube, water screen tube is provided with water-cooling wall abrasionproof step, described abrasionproof step is sheet metal, there is in the first side of described sheet metal the groove matched with the external diameter of water screen tube, second side relative with described first side is rectilinear form, at the joint of water-cooling wall abrasionproof step and water screen tube, the expansion clearance of preset width is left between described groove and water screen tube, the diameter of described water screen tube 1 is Φ, the thickness of abrasionproof step is h, width is d, the radius of curvature of the groove part engaged with water screen tube is R.
In an embodiment of the present utility model, on described abrasionproof step upper water cold wall pipe, height of formation is the metal spraying of H, and is filled with a sealing with the expansion clearance of above-mentioned metal spraying by water screen tube and water-cooling wall abrasionproof step.
In an embodiment of the present utility model, R is more than or equal to Φ/2, and is less than Φ.
In an embodiment of the present utility model, H is 10-20cm.
In an embodiment of the present utility model, Φ < d < 5 Φ.
In an embodiment of the present utility model, the expansion clearance of described preset width is 0.5-5mm.
In an embodiment of the present utility model, the setting of described abrasionproof step on water screen tube is spaced apart 2-4m.
In an embodiment of the present utility model, the thickness of abrasionproof step is h is 4-6mm.
In an embodiment of the present utility model, described abrasionproof step adopts stainless steel material to make.
Accompanying drawing explanation
The air-flow of Fig. 1 fluidized-bed combustion boiler flame combustion chamber moves towards schematic diagram
Fig. 2 fluidized-bed combustion boiler abrasionproof ledge structure schematic diagram
Fig. 3 fluidized-bed combustion boiler abrasionproof step scheme of installation
Fig. 4 fluidized-bed combustion boiler abrasionproof ledge structure schematic diagram
Detailed description of the invention
For ease of understanding the present invention, it is as follows that the utility model enumerates embodiment.Those skilled in the art should understand, described embodiment only understands the present invention for helping, and should not be considered as concrete restriction of the present utility model.
In figure: 1 is water screen tube, 2 is flame, and 3 is water-cooling wall abrasionproof step, and 4 is metal spraying, and 5 is welded and installed place, and 6 is expansion clearance
Fluidized-bed combustion boiler general principle:
The water screen tube 1 that the burner hearth of CFBB is arranged by surrounding and the boiler plant such as the combustion chamber of bottom and the stove exit on top form, fluidized-bed combustion boiler is in burning, burner hearth flame of centre and comburant are upwards, around water screen tube, due to the absorbing and cooling temperature of water screen tube, and form low-pressure area, make fraction produce convection current in stove and carry part soot particle to flow downward in wall-cooling surface collision rift concentrates between tube and tube groove, because air-flow is downward around water-cooling wall, identical with the direction of motion of soot particle, therefore air-flow is zero to the resistance of soot particle substantially, after soot particle in groove is concentrated, wearing and tearing are formed with the descending both sides to pipe of the acceleration of free-falling, with the high computational of 30 meters, the speed that soot particle falls can reach 24.3m/s.Through concentrating on studies, present inventor finds that the speed that soot particle falls is higher, it is about serious to the wearing and tearing of water-cooled tube wall, and therefore, the falling speed reducing soot particle can reduce and prevent the wearing and tearing of water-cooling wall effectively.
Be that the close-fitting comb plate, comb joint accessory with water screen tube 1 made by the sheet material of h by thickness, i.e. water-cooling wall abrasionproof step 3 as shown in Figure 2, the material of described sheet material can be stainless steel.The concrete structure of described abrasionproof step is: the first side has the groove matched with the external diameter of water screen tube 1, and second side relative with described first side is arbitrary shape, and it can be arranged according to the arrangement mode of water screen tube 1, is preferably linear.
Water-cooling wall abrasionproof step 3 and water screen tube adopt the mode of welding to install, and level is docked, composition step.The joint of water-cooling wall abrasionproof step 3 and water-cooled tube wall leave predetermined expansion clearance 6, described predetermined expansion clearance can be 0.5-5mm, preferably 0.5mm, 1mm, 1.8mm, on step upper water cold wall pipe, height of formation is the span of the metal spraying 4, H of H is 10-20cm, and is filled with a sealing the expansion clearance 6 of water screen tube 1 with water-cooling wall abrasionproof step 3 by above-mentioned metal spraying, anti-leak-stopping ash, strengthens heat transfer.On burner hearth emulsion zone upper water cold wall pipe, each 2-4m installs one deck step, utilizes multistage blocking-up ash quantity descending continuously, reaches abrasionproof object.
The diameter of setting water screen tube 1 is Φ, and the thickness of abrasionproof step 3 is h, and width is d, and the radius of curvature of the groove part engaged with water screen tube 1 is R, and the height of metal spraying is H.Then meet following relational expression:
R is more than or equal to Φ/2, and be less than Φ, preferred R equals Φ/2, namely the radius of curvature of groove part is identical with the radius of curvature of water screen tube 1, this ensures that described abrasionproof step 3 closely cooperates, so that be firmly fixed on described water screen tube 1 by described abrasionproof step 3 with water screen tube 1 like this.
H=2-10mm, be preferably 4-6mm, the best is 5mm, it should be noted that not to be will make the thickness of abrasionproof step 3 being particularly limited to here, the difference of the material that described thickness can adopt according to described abrasionproof step 3, the difference of environment for use is selected as required.
Φ < d < 5 Φ, the width of described abrasionproof step 3 also needs meticulous selection, if width d numerical value is too small, then limited to the damming of soot particle, slowing down power(SDP), if width d numerical value is excessive, then on the one hand because himself weight is excessive, on the other hand it is easily piled up a large amount of soot particles and cause it greatly to increase the requirement of welding, width excessive in addition will certainly take the furnace cavity of excessive boiler internal, has a strong impact on the operating efficiency of boiler.
The height of metal spraying is that H can select according to the interval that arranges of described abrasionproof step 3, and when being spaced apart 2-4m, H is 10-20cm, preferred 12cm, 15cm, 18cm.
Any quoting in this manual for " embodiment ", " embodiment ", " exemplary embodiment " etc. all means that special characteristic, structure or the characteristic described in conjunction with this embodiment is included at least one embodiment of the present invention.This kind of phrase occurred everywhere in the description need not all point to same embodiment.In addition, when describing special characteristic, structure or characteristic in conjunction with any embodiment, all to think in conjunction with other embodiment in these embodiments to realize such feature, structure or characteristic it is also that those skilled in the art can expect.
Should be appreciated that, those skilled in the art can expect falling into multiple other amendment and embodiments in the spirit and scope of the utility model principle.More specifically, in the building block of the subject combination arrangement in the scope of the disclosure, accompanying drawing and claims and/or arrangement, variations and modifications are all possible.For a person skilled in the art, except the change of building block and/or arrangement aspect and amendment, alternative purposes also will be apparent.
Claims (9)
1. a CFBB, comprise, water screen tube, water screen tube is provided with water-cooling wall abrasionproof step, described abrasionproof step is sheet metal, there is in the first side of described sheet metal the groove matched with the external diameter of water screen tube, second side relative with described first side is rectilinear form, at the joint of water-cooling wall abrasionproof step and water screen tube, the expansion clearance of preset width is left between described groove and water screen tube, the diameter of described water screen tube is Φ, the thickness of abrasionproof step is h, width is d, the radius of curvature of the groove part engaged with water screen tube is R.
2. CFBB as claimed in claim 1, on described abrasionproof step upper water cold wall pipe, height of formation is the metal spraying of H, and is filled with a sealing with the expansion clearance of above-mentioned metal spraying by water screen tube and water-cooling wall abrasionproof step.
3. CFBB as claimed in claim 1, R is more than or equal to Φ/2, and is less than Φ.
4. CFBB as claimed in claim 2, H is 10-20cm.
5. CFBB as claimed in claim 1, Φ < d < 5 Φ.
6. CFBB as claimed in claim 1, the expansion clearance of described preset width is 0.5-5mm.
7. CFBB as claimed in claim 1, the setting of described abrasionproof step on water screen tube is spaced apart 2-4m.
8. CFBB as claimed in claim 1, the thickness of abrasionproof step is h is 4-6mm.
9. the CFBB as described in claim 1-8 any one, described abrasionproof step adopts stainless steel material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420555259.8U CN204240342U (en) | 2014-09-13 | 2014-09-13 | Cfbb |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420555259.8U CN204240342U (en) | 2014-09-13 | 2014-09-13 | Cfbb |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204240342U true CN204240342U (en) | 2015-04-01 |
Family
ID=52769831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420555259.8U Expired - Fee Related CN204240342U (en) | 2014-09-13 | 2014-09-13 | Cfbb |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204240342U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110582670A (en) * | 2017-03-03 | 2019-12-17 | 住友重工福威能源有限公司 | Water panel section and method for manufacturing water panel section in fluidized bed reactor |
-
2014
- 2014-09-13 CN CN201420555259.8U patent/CN204240342U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110582670A (en) * | 2017-03-03 | 2019-12-17 | 住友重工福威能源有限公司 | Water panel section and method for manufacturing water panel section in fluidized bed reactor |
| CN110582670B (en) * | 2017-03-03 | 2022-02-11 | 住友重机械福惠能源有限公司 | Water panel section and method for manufacturing water panel section in fluidized bed reactor |
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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: 20150401 Termination date: 20160913 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |