CN107859993A - A kind of CFB Slag cooling structure and method - Google Patents
A kind of CFB Slag cooling structure and method Download PDFInfo
- Publication number
- CN107859993A CN107859993A CN201711094126.XA CN201711094126A CN107859993A CN 107859993 A CN107859993 A CN 107859993A CN 201711094126 A CN201711094126 A CN 201711094126A CN 107859993 A CN107859993 A CN 107859993A
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- Prior art keywords
- water
- cooling
- chamber
- cooling wall
- slag
- Prior art date
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Links
- 238000001816 cooling Methods 0.000 title claims abstract description 192
- 238000000034 method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000002893 slag Substances 0.000 claims abstract description 27
- 239000010882 bottom ash Substances 0.000 claims abstract description 21
- 239000002826 coolant Substances 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 7
- 230000003134 recirculating effect Effects 0.000 claims abstract description 7
- 239000003570 air Substances 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010884 boiler slag Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a kind of CFB Slag cooling structure and method.The cooling structure includes the water cooled wind chamber located at burner hearth bottom, and the outside of burner hearth is provided with dreg cooling chamber's water-cooling wall, and dreg cooling chamber's water-cooling wall extends downwardly the bottom along the outside of water cooled wind chamber to water cooled wind chamber, and it forms dreg cooling chamber with water cooled wind chamber water-cooling wall.The high temperature bottom slag that the bottom ash particle that recirculating fluidized bed is formed is discharged from the slag inlet of burner hearth bottom slowly flows across, and contacts and is exchanged heat with dreg cooling chamber's water-cooling wall and water cooled wind chamber water-cooling wall, is cooled down fluid bed high temperature bottom slag；After cooling medium in dreg cooling chamber's water-cooling wall is heated, water cooled air compartment lower header enters water cooled wind chamber water-cooling wall, and the bottom ash heat that dreg cooling chamber absorbs enters boiler steam-water circulation system immediately.The present invention makes bottom ash accumulation of heat directly can be reclaimed by boiler, improves boiler thermal output；Dreg cooling chamber is directly cooled down with boiler water, is reduced or without other water sources, is saved power plant water.
Description
Technical field
The present invention relates to a kind of CFB Slag cooling structure and method, and in particular to one kind furnace water cooling
The structure and method of wall cooling bed boiler high temperature bottom ash, for cooling down CFB Slag, belong to ciculation fluidized
Bed boiler technology field.
Background technology
The bottom ash of CFBB discharge is a kind of wide-size distribution (0~30mm), the solid of high-temperature (~900 DEG C)
Grain, belong to the material of more difficult operation and control, especially Large Copacity (or big quantity of slag) CFB boiler, both at home and abroad all without good
Solution.Therefore, dreg cooling chamber belongs to one of technological difficulties the most intractable in fluidized-bed combustion boiler accessory system.Introduce the country
Fluidized bed type dreg cooling chamber cause due to slagging, boiler slag removal control failure and dreg cooling chamber's cooling factor such as heating surface wear be present
The problems such as dreg cooling chamber does not reach expected cooling effect, very big economic loss is caused to power plant.And some mechanical cold slags
Room, such as water cooling auger, water cold drum, due to there is it is poorly sealed, cooling capacity is poor, repair and maintenance workload is big etc. asks
Topic, application prospect is not very optimistic at home.
Method and apparatus in the market on recirculating fluidized bed bottom slag cooling is more, and the cooling of cylinder type cold grit chamber is former
Reason is that CFB bottom ash is incorporated into the roller of rotation by pipeline, and arrangement heating surface has medium in the interlayer or cylinder of roller
Water cools down, because the device has mechanical rotation so that the pressure of water cooling medium can not be too high, general to require to be less than
4.0MPa, additionally, due to rotatable parts be present, the sealing of slag inlet is also very difficult to handle, and comercial operation shows that the equipment is frequent
There is leak, leakage slag, bottom ash heat can not be reclaimed effectively.
The dreg cooling chamber of wind and water combined circulating fluid bed type, its design principle are that a class is added outside CFBB
The dreg cooling chamber of bubbling bed is similar to, is generally made up of several rooms separated by weir wall, the bottom ash of fluidized-bed combustion boiler is drawn by pipeline
To the empty room part of the device, air dielectric is passed through to fluidize bottom by dreg cooling chamber's bottom air distribution plate in circulating fluid bed type
Slag, flowing and conveying of the bottom ash between each room are realized, according to cooling required, snake heating surface of tubes is arranged in dreg cooling chamber.This
The flowing that the dreg cooling chamber of kind form shows between each room of bottom ash in operation is not smooth, will often find that stifled slag etc. is asked
Topic.
The content of the invention
Problem to be solved by this invention is：Existing wind and water combined circulating fluid bed type dreg cooling chamber blocks up slag, abrasion, is heated
A kind of the problems such as face is not easy to change, there is provided bottom ash cooling for being suitable for the fuel such as the high ash content of CFBC, low heat value
Method and the device and corresponding system for realizing this method, and how to utilize furnace wall cooling surface pipe composition dreg cooling chamber
Cavity, using the cavity as heating surface, bottom ash is cooled down using the stove water of boiler, realize the heat recovery of bottom ash, reduce dreg cooling chamber
Usage quantity and floor space.
In order to solve the above-mentioned technical problem, the invention provides a kind of CFB Slag cooling structure, including
Located at the water cooled wind chamber of burner hearth bottom, the side of water cooled wind chamber is provided with air inlet, and the water-cooling wall one of lower furnace portion is provided with slag input
Mouthful, it is characterised in that the outside of the burner hearth is provided with dreg cooling chamber's water-cooling wall, and dreg cooling chamber's water-cooling wall is extended downwardly along water cooled wind chamber
Outside to the bottom of water cooled wind chamber, it forms dreg cooling chamber with water cooled wind chamber water-cooling wall, and slag inlet is located in dreg cooling chamber, dreg cooling chamber
Bottom be provided with slag-drip opening, slag-drip opening is made up of water-cooling wall six.
Preferably, the junction of the water cooled wind chamber and dreg cooling chamber is provided with water cooled wind chamber lower header, water cooled wind chamber water-cooling wall,
Dreg cooling chamber's water-cooling wall connects with water cooled wind chamber lower header；Burner hearth, water cooled wind chamber, the junction of dreg cooling chamber three are provided with water cooled wind chamber
Upper collecting chamber, water-cooling wall one, water cooled wind chamber water-cooling wall connect with water cooled wind chamber upper collecting chamber.
Preferably, dreg cooling chamber's water-cooling wall is by the oblique outer downward water-cooling wall two, the water straight down that are sequentially connected
Cold wall three, in the diagonal downward water-cooling wall four, horizontal direction water-cooling wall five and extend to the water cooling of water cooled wind chamber straight up
Wall seven forms, and slag-drip opening is located at the downside of water-cooling wall five；Water cooled wind chamber water-cooling wall by be sequentially connected water-cooling wall eight straight down,
In the diagonal downward water-cooling wall nine, horizontal direction water-cooling wall ten and extend to the water-cooling wall of boiler water wall bottom straight up
11 compositions.
It is highly preferred that the angle of the water-cooling wall four and water-cooling wall five is 135 °~180 °.
Preferably, dreg cooling chamber's water-cooling wall uses fin panel casing.
Preferably, the burner hearth bottom is located at the lower section of slag-drip opening and is provided with burner hearth air distribution plate.
Preferably, the cooling medium of all water-cooling walls is stove water.
Present invention also offers a kind of CFB Slag cooling means, the bed of fuel and composition recirculating fluidized bed
Material completes burning in burner hearth, and required portion of air enters water cooled wind chamber by air inlet, then is fluidized by air distribution plate
Flue gas caused by bed and fuel, air and fuel combustion carries substantial amounts of particle secretly and enters cyclone separator, and coarse granule passes through rotation
Wind separation returns to burner hearth by material returning device and carries out circulating combustion, and the fine grained not being separated then forms flying dust with flue gas by whirlwind
The top of separator is discharged into afterbody convection pass, it is characterised in that using above-mentioned CFB Slag cooling knot
Structure, the high temperature bottom slag that the bottom ash particle that the recirculating fluidized bed is formed is discharged from the slag inlet of burner hearth bottom slowly flow across, and cold
Grit chamber's water-cooling wall and the contact of water cooled wind chamber water-cooling wall are exchanged heat, and are cooled down fluid bed high temperature bottom slag, then from slag-drip opening
Discharge；After cooling medium in dreg cooling chamber's water-cooling wall is heated, water cooled air compartment lower header enters water cooled wind chamber water-cooling wall, dreg cooling chamber
The bottom ash heat of absorption enters boiler steam-water circulation system immediately.
Compared with prior art, the beneficial effects of the present invention are：
1. bottom ash accumulation of heat can be reclaimed directly by boiler, boiler thermal output is improved；
2. dreg cooling chamber's surrounding is directly formed using water wall surface, make dreg cooling chamber safe and reliable, be easy to INSULATION DESIGN；
3. dreg cooling chamber is arranged in the bottom of water-cooling wall cone section, arrangement is convenient, saves space；
4. dreg cooling chamber is directly cooled down with boiler water, reduce or without other water sources, save power plant water.
Brief description of the drawings
Fig. 1 is a kind of structural representation of CFB Slag cooling structure provided by the invention.
Embodiment
To become apparent the present invention, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Embodiment
As shown in figure 1, be a kind of CFB Slag cooling structure provided by the invention, including located at burner hearth 1
The water cooled wind chamber 2 of bottom, the side of water cooled wind chamber 2 are provided with air inlet B, and the water-cooling wall 1 of the bottom of burner hearth 1 is provided with slag inlet
A, it is characterised in that the outside of the burner hearth 1 is provided with dreg cooling chamber's water-cooling wall 7, and dreg cooling chamber's water-cooling wall 7 uses fin panel casing.It is cold
Grit chamber's water-cooling wall 7 is extended downwardly along the outside of water cooled wind chamber to the bottom of water cooled wind chamber 2, and it is formed with water cooled wind chamber water-cooling wall
Dreg cooling chamber 4, slag inlet A are located in dreg cooling chamber 4, and the bottom of dreg cooling chamber 4 is provided with slag-drip opening 5, and slag-drip opening 5 is by the structure of water-cooling wall 6 26
Into.The lower section that the bottom of burner hearth 1 is located at slag inlet A is provided with burner hearth air distribution plate 9.Water cooled wind chamber 2 and the junction of dreg cooling chamber 4 are provided with water
Cold air chamber's lower header 3, water cooled wind chamber water-cooling wall, dreg cooling chamber's water-cooling wall 7 connect with water cooled wind chamber lower header 3；Burner hearth 1, water cooling wind
Room 2, the junction of the three of dreg cooling chamber 4 are provided with water cooled wind chamber upper collecting chamber 6, water-cooling wall 1, water cooled wind chamber water-cooling wall and water cooling wind
Room upper collecting chamber 6 connects.Dreg cooling chamber's water-cooling wall 7 by be sequentially connected oblique outer downward water-cooling wall 2 22, water cooling straight down
Wall 3 23, in the diagonal downward water-cooling wall 4 24, horizontal direction water-cooling wall 5 25 and extend to water cooled wind chamber 2 straight up
Water-cooling wall 7 27 forms, and slag-drip opening 5 is located at the downside of water-cooling wall 5 25；Water cooled wind chamber water-cooling wall by be sequentially connected straight down
Water-cooling wall 8 28, in the diagonal downward water-cooling wall 9 29, horizontal direction water-cooling wall 10 and extend to boiler water straight up
The water-cooling wall 11 of the bottom of cold wall 22 forms.The angle of water-cooling wall 4 24 and water-cooling wall 5 25 is 135 °~180 °.7. as weighed
Profit requires the CFB Slag cooling structure described in 1, it is characterised in that the cooling medium of all water-cooling walls is stove
Water.
A kind of CFB Slag cooling means：
The bed of fuel and composition recirculating fluidized bed completes burning in burner hearth 1, and required portion of air is by entering
Air port B enters water cooled wind chamber 2, then by air distribution plate fluidized bed material and fuel, flue gas entrainment is big caused by air and fuel combustion
The particle of amount enters cyclone separator, and coarse granule returns to burner hearth 1 by material returning device by cyclonic separation and carries out circulating combustion, do not have
Separated fine grained then forms flying dust and is discharged into afterbody convection pass by the top of cyclone separator with flue gas, ciculation fluidized
The bottom ash particle that bed is formed slowly flows across from the slag inlet A of the bottom of burner hearth 1 high temperature bottom slag discharged, with dreg cooling chamber water-cooling wall 7 and
The contact of water cooled wind chamber water-cooling wall is exchanged heat, and is cooled down fluid bed high temperature bottom slag, is then discharged from slag-drip opening 5；Dreg cooling chamber
After cooling medium in water-cooling wall 7 is heated, water cooled air compartment lower header 3 enters water cooled wind chamber water-cooling wall, the bottom that dreg cooling chamber 4 absorbs
Slag heat enters boiler steam-water circulation system immediately.
Claims (8)
1. a kind of CFB Slag cooling structure, including the water cooled wind chamber (2) located at burner hearth (1) bottom, water cooling wind
The side of room (2) is provided with air inlet (B), and the water-cooling wall one (21) of burner hearth (1) bottom is provided with slag inlet (A), it is characterised in that
The outside of the burner hearth (1) is provided with dreg cooling chamber's water-cooling wall (7), and dreg cooling chamber's water-cooling wall (7) is extended downwardly along the outer of water cooled wind chamber
The bottom of side to water cooled wind chamber (2), it forms dreg cooling chamber (4) with water cooled wind chamber water-cooling wall, and slag inlet (A) is located at dreg cooling chamber (4)
Interior, the bottom of dreg cooling chamber (4) is provided with slag-drip opening (5), and slag-drip opening (5) is made up of water-cooling wall six (26).
2. CFB Slag cooling structure as claimed in claim 1, it is characterised in that the water cooled wind chamber (2)
Water cooled wind chamber lower header (3), water cooled wind chamber water-cooling wall, dreg cooling chamber's water-cooling wall (7) and water cooling are provided with the junction of dreg cooling chamber (4)
Air compartment lower header (3) connects；Burner hearth (1), water cooled wind chamber (2), the junction of dreg cooling chamber (4) three are provided with water cooled wind chamber upper collecting chamber
(6), water-cooling wall one (21), water cooled wind chamber water-cooling wall connect with water cooled wind chamber upper collecting chamber (6).
3. CFB Slag cooling structure as claimed in claim 1, it is characterised in that dreg cooling chamber's water-cooling wall
(7) oblique outer downward water-cooling wall two (22), in the diagonal water-cooling wall three (23) straight down, the downward water by being sequentially connected
Cold wall four (24), horizontal direction water-cooling wall five (25) and extend to water-cooling wall seven (27) group of water cooled wind chamber (2) straight up
Into slag-drip opening (5) is on the downside of water-cooling wall five (25)；Water cooled wind chamber water-cooling wall is by the water-cooling wall eight straight down that is sequentially connected
(28), in the diagonal downward water-cooling wall nine (29), horizontal direction water-cooling wall ten (30) and extend to boiler water cooling straight up
Water-cooling wall 11 (31) composition of wall (22) bottom.
4. CFB Slag cooling structure as claimed in claim 3, it is characterised in that the water-cooling wall four (24)
Angle with water-cooling wall five (25) is 135 °~180 °.
5. CFB Slag cooling structure as claimed in claim 1, it is characterised in that dreg cooling chamber's water-cooling wall
(7) fin panel casing is used.
6. CFB Slag cooling structure as claimed in claim 1, it is characterised in that burner hearth (1) bottom
Burner hearth air distribution plate (9) is provided with positioned at the lower section of slag-drip opening (1).
7. CFB Slag cooling structure as claimed in claim 1, it is characterised in that the cooling of all water-cooling walls
Medium is stove water.
8. the bed of a kind of CFB Slag cooling means, fuel and composition recirculating fluidized bed is complete in burner hearth (1)
Into burning, required portion of air enters water cooled wind chamber (2) by air inlet (B), then by air distribution plate fluidized bed material and
Flue gas caused by fuel, air and fuel combustion carries substantial amounts of particle secretly and enters cyclone separator, and coarse granule passes through cyclonic separation
Burner hearth (1) is returned to by material returning device and carries out circulating combustion, the fine grained not being separated then forms flying dust with flue gas by whirlwind point
Top from device is discharged into afterbody convection pass, it is characterised in that using the recycle stream described in claim 1-7 any one
Fluidized bed boiler bottom ash cooling structure, the bottom ash particle that the recirculating fluidized bed is formed are discharged from the slag inlet (A) of burner hearth (1) bottom
High temperature bottom slag slowly flow across, contact and exchanged heat with dreg cooling chamber's water-cooling wall (7) and water cooled wind chamber water-cooling wall, make fluid bed high temperature
Bottom ash is cooled down, and is then discharged from slag-drip opening (5)；After cooling medium in dreg cooling chamber's water-cooling wall (7) is heated, water cooled air compartment
Lower header (3) enters water cooled wind chamber water-cooling wall, and the bottom ash heat that dreg cooling chamber (4) absorbs enters boiler steam-water circulation system immediately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711094126.XA CN107859993B (en) | 2017-11-08 | 2017-11-08 | Bottom slag cooling structure and method for circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711094126.XA CN107859993B (en) | 2017-11-08 | 2017-11-08 | Bottom slag cooling structure and method for circulating fluidized bed boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107859993A true CN107859993A (en) | 2018-03-30 |
| CN107859993B CN107859993B (en) | 2023-12-01 |
Family
ID=61701361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711094126.XA Active CN107859993B (en) | 2017-11-08 | 2017-11-08 | Bottom slag cooling structure and method for circulating fluidized bed boiler |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260302A (en) * | 2019-06-26 | 2019-09-20 | 西安交通大学 | A kind of fluidized gasification flying dust uses system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598334A (en) * | 2009-06-30 | 2009-12-09 | 上海锅炉厂有限公司 | Bottom slag cooling method of circulating fluidized bed |
| CN102116471A (en) * | 2009-12-30 | 2011-07-06 | 中国科学院工程热物理研究所 | Device and method for recovering bottom slag heat of circulating fluidized bed boiler |
| CN105299665A (en) * | 2015-05-30 | 2016-02-03 | 四川省凯明机械制造有限公司 | Efficient water-cooling and air-cooling slag cooler |
| CN207815303U (en) * | 2017-11-08 | 2018-09-04 | 上海锅炉厂有限公司 | CFB Slag cooling structure |
-
2017
- 2017-11-08 CN CN201711094126.XA patent/CN107859993B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598334A (en) * | 2009-06-30 | 2009-12-09 | 上海锅炉厂有限公司 | Bottom slag cooling method of circulating fluidized bed |
| CN102116471A (en) * | 2009-12-30 | 2011-07-06 | 中国科学院工程热物理研究所 | Device and method for recovering bottom slag heat of circulating fluidized bed boiler |
| CN105299665A (en) * | 2015-05-30 | 2016-02-03 | 四川省凯明机械制造有限公司 | Efficient water-cooling and air-cooling slag cooler |
| CN207815303U (en) * | 2017-11-08 | 2018-09-04 | 上海锅炉厂有限公司 | CFB Slag cooling structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260302A (en) * | 2019-06-26 | 2019-09-20 | 西安交通大学 | A kind of fluidized gasification flying dust uses system |
| CN110260302B (en) * | 2019-06-26 | 2020-05-22 | 西安交通大学 | Combustion system for fluidized bed gasification fly ash |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107859993B (en) | 2023-12-01 |
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