CN204227417U - Circulating fluidized bed boiler capable of inhibiting formation of combustion high-temperature zone - Google Patents
Circulating fluidized bed boiler capable of inhibiting formation of combustion high-temperature zone Download PDFInfo
- Publication number
- CN204227417U CN204227417U CN201420475757.1U CN201420475757U CN204227417U CN 204227417 U CN204227417 U CN 204227417U CN 201420475757 U CN201420475757 U CN 201420475757U CN 204227417 U CN204227417 U CN 204227417U
- Authority
- CN
- China
- Prior art keywords
- air
- blanking tube
- burner hearth
- secondary air
- material blanking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 25
- 230000015572 biosynthetic process Effects 0.000 title abstract description 7
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 239000000446 fuel Substances 0.000 claims abstract description 43
- 239000002028 Biomass Substances 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 44
- 238000010899 nucleation Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 4
- 230000009970 fire resistant effect Effects 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Solid-Fuel Combustion (AREA)
Abstract
A circulating fluidized bed boiler capable of inhibiting the formation of a combustion high-temperature area comprises a feeding system, wherein the feeding system comprises a biomass fuel feeding bin, an outlet of the biomass fuel feeding bin is connected with an inlet of a screw feeder, an outlet of the screw feeder is connected with an inlet of a blanking pipe, a blanking port of the blanking pipe extends into the center of the bottom of a hearth in the depth direction, the circulating fluidized bed boiler further comprises primary air and secondary air, the primary air is arranged at the bottom of the hearth, and the secondary air comprises sealing air and spreading air which are arranged at the blanking pipe and lower secondary air and upper secondary air which are arranged at the side wall of the hearth and far away from the blanking port of the blanking pipe; the blanking pipe extends into the bottom center of the hearth in the depth direction from the hearth wall or extends into the bottom center of the hearth in the depth direction through an air chamber of primary air and an air distribution plate; the utility model discloses can control biomass fuel in the CFB boiler the formation of burning high temperature region, be favorable to burning CFB boiler safety, cleanness, the steady operation of living beings.
Description
Technical field
The utility model belongs to biomass fuel technical field of power generation, is specifically related to a kind of CFBB suppressing combustion high temperature district to be formed.
Background technology
Current, the fossil fuel large usage quantities such as China's coal, oil, natural gas, partial dependency import, fuel price rises violently, and biomass energy highlights more as the advantage of regenerative resource.Biomass-fuel direct-combustion power generation project not only alleviates the problem of China's fossil fuel anxiety, can also realize CO
2zero-emission, to environmental beneficial, simultaneously can make certain contribution for China's structure low-carbon (LC), intensive style, sustainable development society, application prospect is very wide.CFB boiler has the features such as the thermal efficiency is high, unit capacity is large in burning-used biologic mass fuel generating, and at home and abroad biomass fuel power field is widely used.
But biomass fuel ignition temperature is low, catches fire rapidly after entering burner hearth and concentrate heat release, material inlet upper pouring material and water-cooling wall sinter, forming white coke button, affecting water-cooling wall heat transfer effect.And combustion centre's temperature drift, local temperature reaches as high as about 1200 DEG C, causes SO
2and NO
xdischarge increases, particularly NO
xdischarge, except the fuel bound nitrogen in fuel transforms into NO
x, the N in partial air
2and O
2also at high temperature NO can be become by Partial Conversion
x, cause desulfurization and denitration cost to improve.So, the key technology that the formation controlling biomass fuel combustion high temperature district in CFB boiler has just become feeding system to design.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the purpose of this utility model is to provide a kind of CFBB suppressing combustion high temperature district to be formed, the formation in biomass fuel combustion high temperature district in CFB boiler can be controlled, be conducive to the CFB boiler safety of biological substance for combustion, clean, stable operation.
For reaching above object, the utility model adopts following technical scheme:
A kind of CFBB suppressing combustion high temperature district to be formed, comprise feeding system, described feeding system comprises biomass fuel feed hopper 2, the outlet of described biomass fuel feed hopper 2 is connected with the entrance of screw(-type) feeder 3, the outlet of described screw(-type) feeder 3 is connected with the entrance of material blanking tube 5, the blanking port of described material blanking tube 5 stretches to place of burner hearth 1 depth direction bottom centre, also comprise First air and Secondary Air, described First air is arranged on the bottom of burner hearth 1, described Secondary Air comprises the sealing air 4 and material seeding wind 6 that are arranged on material blanking tube 5 place and is arranged on burner hearth 1 side-walls and away from the lower Secondary Air 11 of material blanking tube 5 blanking port and upper Secondary Air 12.
Described material blanking tube 5 stretches to burner hearth 1 depth direction bottom centre by burner hearth 1 furnace wall, and end adopts arc transition and is upturned.
Described material blanking tube 5 stretches to place of burner hearth 1 depth direction bottom centre through the air compartment 8 of First air and air distribution plate 10.
The material of described material blanking tube 5 is 1Cr18Ni9Ti.
Be welded with pin outside the pipe of described material blanking tube 5 and lay fire-resistant and wear-resistant castable.
Described Secondary Air is cold wind.
Compared to the prior art, tool has the following advantages the utility model:
1, because the burner hearth central area that is limited in of CFB boiler secondary air penetration capacity exists oxygen-depleted zone, the blanking port of material blanking tube is stretched to place of furnace depth direction bottom centre by the utility model, biomass fuel is fed by burner hearth center, the design of center feed ensure that fuel can enter in the oxygen-depleted zone at burner hearth center, biomass fuel burns in oxygen-depleted zone, extend the fire stroke of biomass fuel, alleviate the problem that biomass fuel concentrates heat release.Secondary Air is designed to cold wind, and sealing air and material seeding wind are all from Secondary Air, and upper and lower overfiren air port, away from blanking port, extends the time of biomass fuel and Secondary Air mixed combustion.
2, the utility model material seeding wind, sealing air and Secondary Air are cold wind, and Secondary Air position is away from material blanking tube, material blanking tube end adopts arc transition and is upturned, upwards spread along depth centre after making biomass fuel enter burner hearth, ensure that the oxygen debt burning at biomass fuel initial stage, and extend the fire stroke of biomass fuel, effectively control the concentrated heat release of biomass fuel in burner hearth of easily catching fire.
In a word, CFB boiler of the present utility model effectively inhibits the formation of burning-used biologic mass fuel high-temperature region, both achieved the safety of burning-used biologic mass fuel CFB boiler, stable operation, and ensured again and had broad application prospects the environmental protection characteristic that biomass fuel generates electricity.
Accompanying drawing explanation
Fig. 1 is the CFBB schematic diagram that embodiment one can suppress combustion high temperature district to be formed.
Fig. 2 is the CFBB schematic diagram that embodiment two can suppress combustion high temperature district to be formed.
In figure, 1 is burner hearth, and 2 is biomass fuel feed hopper, and 3 is screw(-type) feeder, and 4 is sealing air, and 5 is material blanking tube, and 6 is material seeding wind, and 7 is First air, and 8 is blast cap, and 9 is air compartment, and 10 is air distribution plate, and 11 is lower Secondary Air, and 12 is upper Secondary Air.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
Embodiment one
A kind of CFBB suppressing combustion high temperature district to be formed of the present embodiment, comprise feeding system, described feeding system comprises biomass fuel feed hopper 2, the outlet of biomass fuel feed hopper 2 is connected with the entrance of screw(-type) feeder 3, the outlet of screw(-type) feeder 3 is connected with the entrance of material blanking tube 5, the blanking port of material blanking tube 5 stretches to burner hearth 1 depth direction bottom centre by burner hearth 1 furnace wall, end adopts arc transition and is upturned, and this upwards spreads along depth centre after arranging and biomass fuel can being made to enter burner hearth; Also comprise First air and Secondary Air, First air is arranged on the bottom of burner hearth 1, and Secondary Air comprises the sealing air 4 and material seeding wind 6 that are arranged on material blanking tube 5 place and is arranged on burner hearth 1 side-walls and away from the lower Secondary Air 11 of material blanking tube 5 blanking port and upper Secondary Air 12.
As the preferred embodiment of the present embodiment, the material of described material blanking tube 5 is 1Cr18Ni9Ti.
As the preferred embodiment of the present embodiment, be welded with pin outside the pipe of described material blanking tube 5 and lay fire-resistant and wear-resistant castable, can effectively prevent material blanking tube from wearing and tearing.
As the preferred embodiment of the present embodiment, described Secondary Air is cold wind.
As shown in Figure 1, the method that the present embodiment CFBB suppresses combustion high temperature district to be formed, biomass fuel is entered by the material inlet of biomass fuel feed hopper 2 and sends into screw(-type) feeder 3, biomass fuel is delivered in material blanking tube 5 by screw(-type) feeder 3, sealing air 4 and material seeding wind 6 are secondary cold wind, biomass fuel is delivered in burner hearth 1, play the effect preventing flue gas anti-channeling and material blanking tube 5 from blocking, wherein screw(-type) feeder 3 can ensure biomass fuel continuously, stablely feed in burner hearth; Material blanking tube 5 stretches to after place of bottom centre, furnace depth direction can make biomass fuel enter burner hearth 1 and upwards spreads along depth centre; First air 7 enters burner hearth 1 through air compartment 9, air distribution plate 10 and blast cap 8; Biomass fuel and First air react and release partial heat, effectively inhibit the formation of biomass combustion high-temperature region; Unburned completely biomass fuel enters in the oxygen-depleted zone of burner hearth 1, the lower Secondary Air 11 in the middle part of burner hearth and on Secondary Air 12 effect under burning completely.
As the preferred embodiment of the present embodiment, described biomass fuel is rice husk.
Embodiment two
A kind of CFBB suppressing combustion high temperature district to be formed of the present embodiment, Fig. 1 difference with embodiment one is: material blanking tube 5 stretches to place of burner hearth 1 depth direction bottom centre through the air compartment 8 of First air and air distribution plate 10.The method that other structure and suppression combustion high temperature district are formed is with embodiment one.
Claims (6)
1. the CFBB that combustion high temperature district can be suppressed to be formed, comprise feeding system, it is characterized in that: described feeding system comprises biomass fuel feed hopper (2), the outlet of described biomass fuel feed hopper (2) is connected with the entrance of screw(-type) feeder (3), the outlet of described screw(-type) feeder (3) is connected with the entrance of material blanking tube (5), the blanking port of described material blanking tube (5) stretches to place of burner hearth (1) depth direction bottom centre, also comprise First air and Secondary Air, described First air is arranged on the bottom of burner hearth (1), described Secondary Air comprises the sealing air (4) and material seeding wind (6) that are arranged on material blanking tube (5) place and is arranged on burner hearth (1) side-walls and away from the lower Secondary Air (11) of material blanking tube (5) blanking port and upper Secondary Air (12).
2. a kind of CFBB suppressing combustion high temperature district to be formed according to claim 1, it is characterized in that: described material blanking tube (5) stretches to burner hearth (1) depth direction bottom centre by burner hearth (1) furnace wall, end adopts arc transition and is upturned.
3. a kind of CFBB suppressing combustion high temperature district to be formed according to claim 1, is characterized in that: described material blanking tube (5) stretches to place of burner hearth (1) depth direction bottom centre through the air compartment (8) of First air and air distribution plate (10).
4. a kind of CFBB suppressing combustion high temperature district to be formed according to claim 1, is characterized in that: the material of described material blanking tube (5) is 1Cr18Ni9Ti.
5. a kind of CFBB suppressing combustion high temperature district to be formed according to claim 1, is characterized in that: be welded with pin outside the pipe of described material blanking tube (5) and lay fire-resistant and wear-resistant castable.
6. a kind of CFBB suppressing combustion high temperature district to be formed according to claim 1, is characterized in that: described Secondary Air is cold wind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420475757.1U CN204227417U (en) | 2014-08-21 | 2014-08-21 | Circulating fluidized bed boiler capable of inhibiting formation of combustion high-temperature zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420475757.1U CN204227417U (en) | 2014-08-21 | 2014-08-21 | Circulating fluidized bed boiler capable of inhibiting formation of combustion high-temperature zone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204227417U true CN204227417U (en) | 2015-03-25 |
Family
ID=52925505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420475757.1U Expired - Lifetime CN204227417U (en) | 2014-08-21 | 2014-08-21 | Circulating fluidized bed boiler capable of inhibiting formation of combustion high-temperature zone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204227417U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104315504A (en) * | 2014-08-21 | 2015-01-28 | 中国华能集团清洁能源技术研究院有限公司 | A circulating fluidized bed boiler capable of inhibiting formation of a combustion high-temperature region and an inhibiting method |
-
2014
- 2014-08-21 CN CN201420475757.1U patent/CN204227417U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104315504A (en) * | 2014-08-21 | 2015-01-28 | 中国华能集团清洁能源技术研究院有限公司 | A circulating fluidized bed boiler capable of inhibiting formation of a combustion high-temperature region and an inhibiting method |
| CN104315504B (en) * | 2014-08-21 | 2017-01-11 | 华能国际电力股份有限公司 | Circulating fluidized bed boiler capable of inhibiting formation of combustion high-temperature zone and inhibiting method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20150325 |