CN206724149U - A kind of CFBB A type blast caps - Google Patents
A kind of CFBB A type blast caps Download PDFInfo
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- CN206724149U CN206724149U CN201720392302.7U CN201720392302U CN206724149U CN 206724149 U CN206724149 U CN 206724149U CN 201720392302 U CN201720392302 U CN 201720392302U CN 206724149 U CN206724149 U CN 206724149U
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Abstract
The utility model discloses a kind of CFBB A type blast caps, including blast cap body, the blast cap body is in A types, its middle part sets air inlet duct, both sides then set the exhaust passage connected with air inlet duct respectively, the exhaust passage includes wind inlet section and wind outlet section, the wind inlet section is tapered channel, its microcephaly is that outlet air end connects with wind outlet section passage, and major part connects for air intake with air inlet duct, the wind outlet section is straight channel, fluidized wind from air inlet duct enters in the wind inlet section passage of exhaust passage, and because the conical design of wind inlet section passage causes the pressure head of wind outlet section passage to increase, prevent bottom ash from leaking slag caused by accumulating and leak slag during blowing out or during peak regulation caused by First air suck-back.
Description
Technical field
It the utility model is related to a kind of blast cap of circulating fluidized bed boiler, more particularly to a kind of CFBB A type wind
Cap.
Background technology
CFBB (CFB boiler), which has, is adapted to that various inferior fuels, peak modulation capacity be strong, the low institute's shape of ignition temperature
Into nitrogen oxides it is few, can furnace sorbent injection desulfurization the advantages that, be the new-generation and heating boiler quickly grown in the late two decades.
But counted from CFBB practical operation situation, burner hearth internal heating surface pipeline and air and gas system component wear be serious,
It is its deadly defect that security and stability is poor, continuous operating time is short etc..
In air and gas system, grid plate hood and slag cooler and the feed back leg blast cap of a fluidization are CFB boiler energy
One of enough normal mostly important parts for fluidizing and circulating, directly affect CFB boiler service life and level of security.Cloth wind
Plate blast cap is installed on air distribution plate, is the air-distribution device of CFB boilers, for First air high-speed uniform to be sent into burner hearth, fluidisation
Bed, maintain gas-particle two-phase Rational flow.CFB boiler grid plate hood structure types have 7 types of orientation, two-way A types, multidirectional clock
Cover type and four claw type etc..Orient 7 type blast caps and can orient and blow a substrate material, the disturbance of the increase bed bottom bed of material, be advantageous to
Deslagging, but be the directly opposite preceding Wind discharging hat of heel row spout due to being arranged in structure, the serious erosion mill of Wind discharging hat before causing
Damage.Two-way A types blast cap cloth wind is more uniform, and disturbance effect is preferable, but deslagging effect is poor, to air outlet and blast cap vertex abrasion
It is larger, and leakage slag phenomenon (bed slag enters water cooled wind chamber from blast cap suck-back) often occurs, cause air compartment accumulated slag, air channel to block and grind
Damage, heavy wear can be produced when (30-50m/s) is blown out at a high speed from blast cap to blast cap by carrying the First air of bed slag secretly.Multidirectional bell-shaped
Blast cap air-out is more uniform, but fluidisation control effect is poor, and orientation deslagging effect is poor, and spout is easier to blocking and causes bias current, equally deposits
In wear problem.Therefore, cap structure determines the mostly important factor of blast cap performance with blast cap Effect of Materials.
In summary, the structure setting of existing grid plate hood can not avoid abrasion and high-temperature oxydation rotten in use
The generation of erosion, in addition, the blast cap material of existing CFB boilers is mainly 316,25-20 stainless steels, HK40 etc., and such material exists
When being on active service under the conditions of the bad working environments of 800~1100 DEG C of sulfur-containing medium, its resistance to high temperature corrosion and high-temperature oxydation and high temperature erosion
The ability of abrasion is weaker, is failed so as to blast cap breakage occur, causes First air not flowed by design requirement, form random penetrates
Stream, cause air flow field disorderly.This not only influences fluidization quality, and exacerbates the abrasion of blast cap again, forms vicious circle.
As a result the unplanned blowing out of boiler is often resulted in, has a strong impact on safety in production and economic benefit.
Utility model content
One of the purpose of this utility model is to provide a kind of CFBB A type blast caps, and the A types blast cap is single air intake
The blast cap in road and double exhaust passages, its high-temperature corrosion resistance, resistance to high temperature oxidation and high temperature resistant erosive wear, service life length, and then
Ensure CFBB safe and stable operation level, mitigate maintenance cost, increase economic efficiency.
The utility model purpose is achieved through the following technical solutions：A kind of CFBB A type blast caps, including wind
Cap body, the blast cap body are in A types, and its middle part sets air inlet duct, and both sides then set the exhaust passage connected with air inlet duct respectively, its
It is characterized in, the exhaust passage includes wind inlet section and wind outlet section, and the wind inlet section is tapered channel, and its microcephaly is outlet air end and air-out
Duan Tongdao is connected, and major part connects for air intake with air inlet duct, and the wind outlet section is straight channel, and the fluidized wind from air inlet duct enters
In the wind inlet section passage for entering exhaust passage, and because the conical design of wind inlet section passage causes the pressure head of wind outlet section passage to increase, prevent
Only slag is leaked caused by bottom ash accumulation and leak slag during blowing out or during peak regulation caused by First air suck-back.
The structure of exhaust passage of the present utility model does not use conventional straight channel, but that it is connected with air inlet duct
One section of wind inlet section is arranged to tapered channel, and the major part of tapered channel is connected with air inlet duct, it is possible to reduce air inlet duct enters with exhaust passage
The resistance of wind section, and due to the intake increase of air intake, add the pressure head of wind outlet section, prevent bottom ash from being leaked caused by accumulating
Slag is leaked when slag and blowing out or during peak regulation caused by First air suck-back, avoids air compartment accumulated slag, air channel from blocking and abrasion, so as to avoid
First air entrainment bed slag blowout abrasion blast cap.
Further, the cross-sectional flow area of the air inlet duct is more than the wind inlet section cross-sectional flow area sum of exhaust passage, can enter
The pressure head of the wind outlet section of one step increase exhaust passage, strengthens anti-leak-stopping slag performance.
Further, stepped cylindrical body structure is formed through thickening processing outside the wind outlet section of the exhaust passage, to extend
The exhaust passage outer wear-resistant life-span.
The air inlet duct is cylindrical channel.
Coarse granule bed is located at bed bottom during fluidisation, and coarse grained blast wind crown portion when falling can cause seriously to grind
Damage.Further, to improve the abrasion-resistance at the top of blast cap, the blast cap bodies top is designed as concave surface knot to the utility model
Structure, edge one week are contour protrusion embankment, bed are accumulated at the top of blast cap during use, impact is in top heap when particulate matter is fallen
Cushioning effect is played in product bed, is protected at the top of blast cap not by direct impact wear.
From air outlet blowout fluidized wind often because rotation and caused by fluidized wind eddy flow or bias current, as a result boiler furnace burning effect
Fruit is bad, and abrasion is abnormal, for effectively prevent fluidized wind rotation by the wind outlet section inner surface Cross section Design of exhaust passage be waveform or
Semicircular structure.
Exhaust passage air-out direction directly affects the wear condition of fluid effect and blast cap, exhaust passage air-out direction and air inlet duct
The angle α in air intake direction is too small, then the direct blow loss air distribution plate of fluidized wind pours the bed of material, and fluidisation wind resistance is larger, and fluidization subtracts
It is weak；Exhaust passage air-out direction and the angle α in air inlet duct air intake direction are excessive, then the easily direct blow loss of fluidized wind is adjacent to blast cap, easy shape
Into horizontal bias current.Therefore, the utility model the angle α in exhaust passage air-out direction and air inlet duct air intake direction is set it is more satisfactory
Scope is 30 ~ 60 °.
Blast cap body described in the utility model is prepared using the high temperature alloy of high temperature tolerance and high-wearing feature.Described
The composition of high temperature alloy is as follows：
Constituent mass percentage
C 0.6~0.8%
Cr 26~30%
Ni 31~35%
Mo 2.2~2.6%
Mn 2.0~2.5%
Si 1.3~1.5%
Nb 1.3~1.5%
Y 0.1~0.2%
Ce 0.1~0.15%
N 0.2~0.4%
Ti 0.1~0.2%
B 0.1~0.12%
Zr 0.07~0.1%
Fe surpluses.
The utility model has advantages below compared with prior art：
1. the structure of the exhaust passage of CFBB A type blast caps provided by the utility model does not use conventional
Straight channel, but that section of wind inlet section that it is connected with air inlet duct is arranged to tapered channel, the major part and air intake of tapered channel
Road connects, it is possible to reduce the resistance of air inlet duct and exhaust passage wind inlet section, and due to the intake increase of air intake, add out
The pressure head of wind section, prevent bottom ash from leaking slag caused by accumulating and leak slag during blowing out or during peak regulation caused by First air suck-back, avoid
Air compartment accumulated slag, air channel block and abrasion, so as to avoid First air entrainment bed slag blowout abrasion blast cap.
2. the cross-sectional flow area of air inlet duct of the present utility model is more than the wind inlet section cross-sectional flow area sum of two exhaust passages, can
Further increase the pressure head of the wind outlet section of exhaust passage, strengthen anti-leak-stopping slag performance.
3. stepped cylindrical body structure is formed through thickening processing outside the wind outlet section of exhaust passage of the present utility model, to extend
The exhaust passage outer wear-resistant life-span.
4. blast cap bodies top of the present utility model is designed as concave structure, edge one week is contour protrusion embankment, is made
Used time accumulates bed at the top of blast cap, and impact is accumulated at top when particulate matter is fallen plays cushioning effect in bed, protect blast cap
Top is not by direct impact wear.
5. the wind outlet section inner surface Cross section Design of the utility model exhaust passage is waveform or semicircular structure, effectively prevent
Fluidized wind rotation improves boiler furnace combustion efficiency, reduces inordinate wear, is that fluidisation is uniform.
6. the utility model by the more satisfactory scope that the angle α of exhaust passage air-out direction and air inlet duct air intake direction is set as
30 ~ 60 °, there is provided fluid effect and the wear condition for reducing blast cap.
7. the utility model blast cap is prepared using the high temperature alloy of high temperature tolerance and high-wearing feature, it is wear-resisting resistance to improve its
High-temperature behavior.
Brief description of the drawings
Fig. 1 is the structural representation of the part section of embodiment one；
Fig. 2 is the top view of embodiment one；
Fig. 3 is Fig. 1 A to enlarged drawing.
Embodiment
Embodiment one
Shown in Fig. 1-3 is the embodiment of the utility model CFBB A type blast caps, including blast cap body 1, should
Blast cap body 1 is in A types, and its middle part sets air inlet duct 2, and both sides then set the exhaust passage connected with air inlet duct 2 respectively.Air inlet duct 2
For cylindrical channel.Exhaust passage includes wind inlet section 3 and wind outlet section 4.Wherein, wind outlet section 4 is straight channel, and wind inlet section 3 leads to for taper
Road, its microcephaly is that outlet air end connects with the passage of wind outlet section 4, and major part connects for air intake with air inlet duct 2.From air inlet duct 2
Fluidized wind enters in the passage of wind inlet section 3 of exhaust passage, and because the conical design of the passage of wind inlet section 3 causes the passage of wind outlet section 4
Pressure head increase, prevent bottom ash from leaking slag caused by accumulating and leak slag during blowing out or during peak regulation caused by First air suck-back.
The structure of the exhaust passage of the present embodiment does not use conventional straight channel, but that it is connected with air inlet duct 2
One section of wind inlet section 3 is arranged to tapered channel, and the major part of tapered channel is connected with air inlet duct 2, it is possible to reduce air inlet duct 2 and exhaust passage
The resistance of wind inlet section 3, and due to the intake increase of air intake, add the pressure head of wind outlet section 4, prevent bottom ash accumulation from causing
Leakage slag and leak slag during blowing out or during peak regulation caused by First air suck-back, avoid air compartment accumulated slag, air channel from blocking and abrasion, so as to
Avoid First air entrainment bed slag blowout abrasion blast cap.
The cross-sectional flow area of air inlet duct 2 is more than the cross-sectional flow area sum of wind inlet section 3 of two exhaust passages, further can increase
The pressure head of the wind outlet section 4 in air channel, strengthen anti-leak-stopping slag performance.
Stepped cylindrical body structure 5 is formed through thickening processing outside the wind outlet section 4 of exhaust passage, it is resistance to outside exhaust passage to extend
Grind the life-span.
Coarse granule bed is located at bed bottom during fluidisation, and coarse grained blast wind crown portion when falling can cause seriously to grind
Damage.To improve the abrasion-resistance at the top of blast cap, the top design of blast cap body 1 is concave structure 6, and edge one week is contour protrusion
Embankment 7, bed is accumulated at the top of blast cap during use, when particulate matter is fallen impact plays cushioning effect in top accumulation bed,
Protect at the top of blast cap not by direct impact wear.
From air outlet blowout fluidized wind often because rotation and caused by fluidized wind eddy flow or bias current, as a result boiler furnace burning effect
Fruit is bad, and abrasion is abnormal, for effectively prevent fluidized wind rotation by the wind outlet section inner surface Cross section Design of exhaust passage be waveform or
Semicircular structure 8.
Exhaust passage air-out direction directly affects the wear condition of fluid effect and blast cap, exhaust passage air-out direction and air inlet duct
The angle α in 2 air intake directions is too small, then the direct blow loss air distribution plate of fluidized wind pours the bed of material, and fluidisation wind resistance is larger, and fluidization subtracts
It is weak；Exhaust passage air-out direction and the angle α in air inlet duct air intake direction are excessive, then the easily direct blow loss of fluidized wind is adjacent to blast cap, easy shape
Into horizontal bias current.Therefore, the utility model is relatively managed what exhaust passage air-out direction and the angle α in the air intake direction of air inlet duct 2 were set
It is 30 ~ 60 ° to think scope.
A type blast caps are manufactured and obtained by the following method：Melting, casting, solution treatment, water-cooled process, pickling are carried out successively
With bead.According to the following ratio successively by carbon (C), chromium (Cr), nickel (Ni), molybdenum (Mo), niobium (Nb), manganese in fusion process
(Mn), silicon (Si), boron (B), titanium (Ti), nitrogen (N), zirconium (Zr), yttrium (Y), cerium (Ce) and iron (Fe) are added in stove, smelting temperature control
System is at 1620~1640 DEG C, and first by formwork heating and thermal insulation to 1150~1170 DEG C before casting, cast temperature controls 1550~
1580 DEG C, cap pouring port is highly than normal high by 50~60%, 1180~1200 DEG C of solid solution temperature, 4 ~ 6 hours processing times.
C 0.6~0.8%
Cr 26~30%
Ni 31~35%
Mo 2.2~2.6%
Mn 2.0~2.5%
Si 1.3~1.5%
Nb 1.3~1.5%
Y 0.1~0.2%
Ce 0.1~0.15%
N 0.2~0.4%
Ti 0.1~0.2%
B 0.1~0.12%
Zr 0.07~0.1%
Fe surpluses.
The utility model can be summarized with others without prejudice to the concrete form of spirit or essential characteristics of the present utility model.
Above-described embodiment of the present utility model can only all be considered to illustrate and not limit to of the present utility model, every according to this practicality
Any subtle modifications, equivalent variations and modifications that new substantial technological is made to above example, belong to the utility model
In the range of technical scheme.
Claims (7)
1. a kind of CFBB A type blast caps, including blast cap body, the blast cap body is in A types, and its middle part sets air intake
Road, both sides then set the exhaust passage connected with air inlet duct respectively, it is characterized in that, the exhaust passage includes wind inlet section and wind outlet section,
The wind inlet section is tapered channel, and its microcephaly is that outlet air end connects with wind outlet section passage, and major part is air intake and air inlet duct company
Logical, the wind outlet section is straight channel, and the fluidized wind from air inlet duct enters in the wind inlet section passage of exhaust passage, and due to wind inlet section
The conical design of passage causes the pressure head of wind outlet section passage to increase, and prevents bottom ash from leaking slag caused by accumulating and during blowing out or peak regulation
When First air suck-back caused by leak slag.
2. CFBB A type blast caps according to claim 1, it is characterized in that, the passage section of the air inlet duct
Product is more than the wind inlet section cross-sectional flow area sum of two exhaust passages, further increases the pressure head of the wind outlet section of exhaust passage.
3. CFBB A type blast caps according to claim 1 or 2, it is characterized in that, the wind outlet section of the exhaust passage
It is outside to form stepped cylindrical body structure through thickening processing.
4. CFBB A type blast caps according to claim 3, it is characterized in that, the blast cap bodies top design
For concave structure, edge one week is contour protrusion embankment.
5. CFBB A type blast caps according to claim 4, it is characterized in that, the wind outlet section inner surface of exhaust passage
Cross section Design is waveform or semicircular structure.
6. CFBB A type blast caps according to claim 5, it is characterized in that, exhaust passage air-out direction and air intake
The more satisfactory scope that the angle α in road air intake direction is set is 30 ~ 60 °.
7. CFBB A type blast caps according to claim 6, it is characterized in that, the air inlet duct is logical for cylinder
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720392302.7U CN206724149U (en) | 2017-04-14 | 2017-04-14 | A kind of CFBB A type blast caps |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720392302.7U CN206724149U (en) | 2017-04-14 | 2017-04-14 | A kind of CFBB A type blast caps |
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| CN206724149U true CN206724149U (en) | 2017-12-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107013904A (en) * | 2017-04-14 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of CFBB A types blast cap and its manufacture method |
| CN108680016A (en) * | 2018-06-01 | 2018-10-19 | 潞城市泰山石膏建材有限公司 | A kind of anti-back powder blast cap of land plaster fluidized bed calcining device |
| CN109943773A (en) * | 2019-02-22 | 2019-06-28 | 刘沁昱 | High-temperature alloy, slag cooler blast cap and preparation method and circulating fluidized bed boiler |
-
2017
- 2017-04-14 CN CN201720392302.7U patent/CN206724149U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107013904A (en) * | 2017-04-14 | 2017-08-04 | 中国石油化工股份有限公司 | A kind of CFBB A types blast cap and its manufacture method |
| CN108680016A (en) * | 2018-06-01 | 2018-10-19 | 潞城市泰山石膏建材有限公司 | A kind of anti-back powder blast cap of land plaster fluidized bed calcining device |
| CN109943773A (en) * | 2019-02-22 | 2019-06-28 | 刘沁昱 | High-temperature alloy, slag cooler blast cap and preparation method and circulating fluidized bed boiler |
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