CN204786362U - Circulating fluidized bed boiler - Google Patents
Circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN204786362U CN204786362U CN201520476533.7U CN201520476533U CN204786362U CN 204786362 U CN204786362 U CN 204786362U CN 201520476533 U CN201520476533 U CN 201520476533U CN 204786362 U CN204786362 U CN 204786362U
- Authority
- CN
- China
- Prior art keywords
- water
- cooling wall
- charging aperture
- cfbb
- burner hearth
- 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.)
- Withdrawn - After Issue
Links
- 238000001816 cooling Methods 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 22
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 20
- 238000005452 bending Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000003245 coal Substances 0.000 abstract description 40
- 239000007921 spray Substances 0.000 abstract description 11
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 239000000446 fuel Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 230000001464 adherent effect Effects 0.000 description 4
- 239000003250 coal slurry Substances 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 230000004089 microcirculation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The utility model discloses a circulating fluidized bed boiler, including water -cooling wall (1) and supply pipe (2), water -cooling wall (1) encloses circulating fluidized bed boiler's furnace, water -cooling wall (1) is provided with the feed inlet that communicates with supply pipe (2) including vertical portion's water -cooling wall (11) and level inside incurvate depressed part water -cooling wall (12) on depressed part water -cooling wall (12), and vertical portion water -cooling wall (11) below feed inlet and the feed inlet separates each other, through the feed inlet gets into furnace's material separates with vertical portion water -cooling wall (11) below the feed inlet each other. The utility model discloses can carry the coal slime of high viscosity among the furnace and the coal slime that near the vertical water -cooling wall in feed inlet separates in order to prevent the high viscosity each other to bond on the water -cooling wall through this feed inlet, can also avoid the easy problem of stopping up of loop seal feed, top feed combustion efficiency is low and the wearing and tearing of feed spray gun are sprayed and need the problem of high pressurized air source to the atomizing.
Description
Technical field
The utility model relates to field of boilers, particularly, relates to a kind of CFBB.
Background technology
Coal slime is the high moisture fuel of isolated coal fine grained also containing various impurity in coal washing process, and its particle diameter is less than 0.5mm usually, and overall proterties is high-moisture, high viscosity, high retentiveness.Due to Combustion technology of circulating fluidized have that fuel tolerance is wide, efficiency of combustion is high, can desulfurization removing nitric efficiently, the features such as fuel treatment system is simple, lime-ash easily utilizes, therefore coal slime mainly adopts burning in circulating fluid bed boiler at present.
At present, coal slime makes mainly to comprise top feed, material returning valve feed and emulsion zone atomized spray in feed-type at burning in circulating fluid bed boiler.Wherein: 1) top feed, namely coal slurrypump is adopted to carry, also be feed-type the most general at present, but there is coal slurry fuel in the middle part of burner hearth, stop not enough problem because this system fuel is directly fed by roof of the furnace, and fine grained is easy to directly to be fluidized wind and carries out burner hearth and discharge through separator and cause efficiency of combustion low; 2) material returning valve feed, namely coal slime employing bulk is directly clamp-oned in CFBB material returning valve and is mixed with a large amount of circulating ash, because high temperature circulation ash quantity is much larger than slime content, therefore coal slime club to be heated in material returning valve very soon, thermal explosion, be finally fed in burner hearth and burn.But in boiler startup stage or low load stage, because circulating ash quantity is less, circulating ash is not enough to the carrying capacity of coal slime, and coal slime can be caused to bond in material returning valve; 3) coal slime atomized spray, namely by coal slurry extrusion pump, coal slime is pressurizeed, then coal slime is made to enter stove burning with spray pattern by coal slime spray gun, there is efficiency of combustion high and do not limit by mixed-fuel burning proportion, but because coal slurry gun spray is generally arranged under boiler emulsion zone, near overfiren air port, therefore spray gun is frayed very serious, and coal slime is atomized main pneumatically, thus compressed air requirement is very large.
But for from boiler side wall directly to material, because it is strong that the distinctive flow behavior of CFBB makes gas-particle two-phase mix, high speed, high concentration, high-throughout recycle stock produce microcirculation in stove, namely in stove, center is that fluidized wind is carried material secretly and risen gradually, the adherent sinking of material is then formed at the furnace wall water-cooling wall near surrounding, although thus can avoid furnace roof directly reinforced and emulsion zone atomizing lance to feed in raw material the problem brought, be constantly bonded on water-cooling wall furnace wall in the coal slime of high viscosity, the high-moisture adherent Doenward flow process in stove.
Therefore, need to provide a kind of can effectively prevent or alleviate coal slime and be bonded in CFBB on water-cooling wall.
Utility model content
The purpose of this utility model is to provide and a kind ofly can effectively prevents or alleviate coal slime and be bonded in CFBB on water-cooling wall.
To achieve these goals, the utility model provides a kind of CFBB, this CFBB comprises water-cooling wall and feed pipe, described water-cooling wall surrounds the burner hearth of described CFBB, wherein, described water-cooling wall comprises the depressed part water-cooling wall that vertical portion water-cooling wall and level inwardly concave, described depressed part water-cooling wall is provided with the charging aperture be communicated with described feed pipe, described vertical portion water-cooling wall below described charging aperture and described charging aperture is spaced, the described vertical portion water-cooling wall entering below the material of described burner hearth and described charging aperture by described charging aperture mutually every.
Preferably, described depressed part water-cooling wall is positioned at the middle part of described water-cooling wall along short transverse.
Preferably, described depressed part water-cooling wall comprises the circular arc upright side walls caved inward and the levelling bench extended towards burner hearth, and described charging aperture is arranged on described levelling bench.
Preferably, the outer peripheral minimum range of described charging aperture center and described levelling bench is 250-300mm.
Preferably, described water-cooling wall comprises water screen tube, and the described water screen tube near described charging aperture is bending to be arranged to form described charging aperture.
Preferably, described CFBB also comprises separator, and described separator is communicated in the top of burner hearth by furnace outlet and is communicated in the bottom of described burner hearth by material returning valve.
Preferably, described CFBB also comprises the back-end ductwork at the top being connected to described separator.
Pass through technique scheme, by arranging the depressed part water-cooling wall that level inwardly concaves on vertical water-cooling wall, and charging aperture is set on this depressed part water-cooling wall, therefore the coal slime in burner hearth is transported to by this charging aperture and the vertical water-cooling wall below charging aperture is spaced, thus full-bodied coal slime can be prevented to be bonded on water-cooling wall, material returning valve feed can also be avoided to hold susceptible to plugging problem and the wearing and tearing of atomized spray feed spray gun and need the problem of high-pressure air source.
Other features and advantages of the utility model are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for description, is used from explanation the utility model, but does not form restriction of the present utility model with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the CFBB according to a kind of detailed description of the invention of the present utility model.
Fig. 2 is the structure chart of the water screen tube of the levelling bench inside of water-cooling wall according to a kind of detailed description of the invention of the present utility model.
Description of reference numerals
1 water-cooling wall 2 feed pipe
3 separator 4 back-end ductworks
11 vertical portion water-cooling wall 12 depressed part water-cooling walls
121 circular arc upright side walls 122 levelling benches
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
According to a kind of detailed description of the invention of the present utility model, provide a kind of CFBB, this CFBB can use flammable high viscous coal slurry or similar fuel, this CFBB comprises water-cooling wall 1 and feed pipe 2, described water-cooling wall 1 surrounds the burner hearth of described CFBB, wherein, water-cooling wall 1 comprises the depressed part water-cooling wall 12 that vertical portion water-cooling wall 11 and level inwardly concave, depressed part water-cooling wall 12 is provided with the charging aperture be communicated with feed pipe 2, described vertical portion water-cooling wall 11 below described charging aperture and described charging aperture is spaced, the vertical portion water-cooling wall 11 being entered below the material of described burner hearth and described charging aperture by described charging aperture is spaced.
As shown in Figure 1, A arrow represents the flow direction of solid particle (i.e. coal slime), and B arrow represents the flow direction of gas.In structure of the present utility model, by forming the depressed part water-cooling wall 12 inwardly concaved on water-cooling wall 1, and charging aperture is set on depressed part water-cooling wall 12, can make described charging aperture can and vertical portion water-cooling wall 11 keep suitable interval, therefore after entering burner hearth from the coal slime of feed pipe 2 by described charging aperture, the coal slime fallen can separate with vertical portion water-cooling wall 11, thus can prevent or reduce coal slime and form adherent solid particle stream, eliminate or alleviate the problem that coal slime is bonded in water-cooling wall.In addition, the utility model adopt at water-cooling wall sidepiece feed, the problem that material returning valve feed bondd in boiler startup stage or the coal slime that causes of low load stage circulating ash quantity deficiency in material returning valve can also be solved, and spray gun serious wear in atomized spray pattern can be avoided and need to configure the problem of the equipment such as high-pressure air source.
Adopt the mode of roof of the furnace feed, under the effect of burner hearth internal high temperature air-flow, more coal slime is carried by air-flow and is entered flue, coal slime time of staying in burner hearth is less and can not burn fully, even if this part of coal slime is transferred by material returning valve return burner hearth, more coal slime also may block material returning valve; And adopting the mode of burner hearth bottom feed, the coal slime of whereabouts is also easy at boiler startup stage or low load stage blocking material returning valve.Therefore, the utility model adopts depressed part water-cooling wall 12 to be positioned at the middle part of water-cooling wall 1 along short transverse, correspondingly, the coal slime coming from feed pipe 2 enters burner hearth from the middle part of water-cooling wall 1, ensure that coal slime stops the longer time to realize Thorough combustion in burner hearth, and coal slime can be avoided to block flue or charging valve.
Particularly, depressed part water-cooling wall 12 comprises the circular arc upright side walls 121 caved inward and the levelling bench 122 extended towards burner hearth, and charging aperture is arranged on levelling bench 122.Levelling bench 122 is connected to the lower limb of circular arc upright side walls 121, and the central axis of the curved surfaces of circular arc upright side walls 121 vertically extends.Depressed part water-cooling wall 12 is formed as the more convenient construction of streamline structure, is also convenient to the laying of internal duct simultaneously.
Further, the outer peripheral minimum range of described charging aperture center and levelling bench 122 is 250-300mm.The outward flange of levelling bench 122 is connected to vertical portion water-cooling wall 11, and described distance is the distance of described charging aperture and vertical portion water-cooling wall 11 with the difference of the thickness of vertical portion water-cooling wall 11.As shown in Figure 1, in CFBB, gas solid two phase flow characteristics makes the particle flow pressing close to vertical portion water-cooling wall 11 place be in sinking, and the full-bodied coal slime be in this sinking is easy to be bonded on vertical portion water-cooling wall 11.In order to make the coal slime being fed to burner hearth avoid adherent sinking, the distance of described charging aperture and vertical portion water-cooling wall 11 can be greater than the thickness of described sinking (along perpendicular to the size on the direction of vertical portion water-cooling wall 11 wall).Described charging aperture can carry out corresponding adjustment according to the burner hearth of different size to the outer peripheral distance of levelling bench 122, keeps suitable distance to make described charging aperture and vertical portion water-cooling wall 12.
In addition, as shown in Figure 2, water-cooling wall 1 comprises water screen tube 13, and the described water screen tube 13 near described charging aperture is bending to be arranged to form described charging aperture.Water screen tube 13 is arranged on the inside of water-cooling wall 1, has recirculated water thus can absorb the calory burning in burner hearth in water screen tube 13.Usually, water screen tube 13 lies alongside one another, and in the utility model, the diameter of the described charging aperture on levelling bench 122 is larger, described charging aperture can not be contained between water screen tube 13, therefore need to arrange bending for water screen tube 13 to make the distance between water screen tube 13 increase, to form the space of the described charging aperture of larger accommodation.
In addition, described CFBB also comprises separator 3, and separator 3 is communicated in the top of burner hearth by furnace outlet and is communicated in the bottom of described burner hearth by material returning valve.The air-flow coal slime that contain that burner hearth can be discharged by separator 3 is separated, and the coal slime separated to be sent back in burner hearth by described material returning valve and again burn, and can ensure that the Thorough combustion of fuel is to improve efficiency of combustion.
Further, described CFBB also comprises the back-end ductwork 4 at the top being connected to separator 3.High-temperature gas after separator 3 processes enters the equipment of next stage by back-end ductwork 4, such as reheater, economizer etc., thus improves boiler thermal output.
Below preferred embodiment of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (7)
1. a CFBB, this CFBB comprises water-cooling wall (1) and feed pipe (2), described water-cooling wall (1) surrounds the burner hearth of described CFBB, it is characterized in that, described water-cooling wall (1) comprises the depressed part water-cooling wall (12) that vertical portion water-cooling wall (11) and level inwardly concave, described depressed part water-cooling wall (12) is provided with the charging aperture be communicated with described feed pipe (2), described vertical portion water-cooling wall (11) below described charging aperture and described charging aperture is spaced, described vertical portion water-cooling wall (11) being entered below the material of described burner hearth and described charging aperture by described charging aperture is spaced.
2. CFBB according to claim 1, is characterized in that, described depressed part water-cooling wall (12) is positioned at the middle part of described water-cooling wall (1) along short transverse.
3. CFBB according to claim 1, it is characterized in that, described depressed part water-cooling wall (12) comprises the circular arc upright side walls (121) caved inward and the levelling bench (122) extended towards burner hearth, and described charging aperture is arranged on described levelling bench (122).
4. CFBB according to claim 3, is characterized in that, the outer peripheral minimum range of described charging aperture center and described levelling bench (122) is 250-300mm.
5. CFBB according to claim 1, it is characterized in that, described water-cooling wall (1) comprises water screen tube (13), and the described water screen tube (13) near described charging aperture is bending to be arranged to form described charging aperture.
6. CFBB according to claim 1, it is characterized in that, described CFBB also comprises separator (3), and described separator (3) is communicated in the top of burner hearth by furnace outlet and is communicated in the bottom of described burner hearth by material returning valve.
7. CFBB according to claim 6, is characterized in that, described CFBB also comprises the back-end ductwork (4) at the top being connected to described separator (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520476533.7U CN204786362U (en) | 2015-07-03 | 2015-07-03 | Circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520476533.7U CN204786362U (en) | 2015-07-03 | 2015-07-03 | Circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204786362U true CN204786362U (en) | 2015-11-18 |
Family
ID=54526408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520476533.7U Withdrawn - After Issue CN204786362U (en) | 2015-07-03 | 2015-07-03 | Circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204786362U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949115A (en) * | 2015-07-03 | 2015-09-30 | 中国神华能源股份有限公司 | Circulating fluidized bed boiler |
-
2015
- 2015-07-03 CN CN201520476533.7U patent/CN204786362U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949115A (en) * | 2015-07-03 | 2015-09-30 | 中国神华能源股份有限公司 | Circulating fluidized bed boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151118 Effective date of abandoning: 20170609 |
|
| AV01 | Patent right actively abandoned |