CN104949116A - Slag falling device and circulating fluidized-bed boiler - Google Patents
Slag falling device and circulating fluidized-bed boiler Download PDFInfo
- Publication number
- CN104949116A CN104949116A CN201510382108.6A CN201510382108A CN104949116A CN 104949116 A CN104949116 A CN 104949116A CN 201510382108 A CN201510382108 A CN 201510382108A CN 104949116 A CN104949116 A CN 104949116A
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- Prior art keywords
- slag
- air inducing
- pipe
- communicated
- bypass
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Classifications
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- 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
- F23C10/24—Devices for removal of material from the bed
-
- 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
Abstract
The invention discloses a slag falling device and a circulating fluidized-bed boiler. The slag-falling device comprises a slag discharging pipe (1), a conveying pipe (2) and a slag feeding pipe (3), wherein an upper end port of the slag discharging pipe (1) is communicated with a slag discharging port of the boiler, and a lower end port of the slag discharging pipe (1) is communicated with an upper end port of the conveying pipe (2); and an upper end port of the slag feeding pipe (3) is communicated with a lower end port of the conveying pipe (2), and a lower end port of the slag feeding pipe (3) is communicated with a slag feeding port of a slag cooler. The slag falling device also comprises an air inducing component which is communicated with the conveying pipe (2) and can form a low-pressure zone above the conveying pipe (2). The air inducing component forms the low-pressure zone above the conveying pipe, so that the gas flow which is carried into the slag cooler by bottom slag when the bottom slag flows downwards is reduced, and a slag running phenomenon caused by lubrication and fluidization effects of gases is avoided; and at the same time, gases entering the low-pressure zone flow in a single phase, so that the wind volume and the wind speed are easy to control.
Description
Technical field
The present invention relates to boiler slag removal field, particularly, relate to one and to fall slag device and CFBB.
Background technology
China's inferior fuel rich reserves, and CFBB is wide for coal adaptability, can realize the low cost of inferior fuel, high efficiency utilization by circulating fluidized-bed boiler Combustion technology.The common feature of inferior fuel is that calorific value is low, content of ashes is high, and therefore, the flying dust flow using the CFBB of these fuel is very large, and end slag flow is also very large.In order to control bed pressure and thickness of bed layer, prevent scoriae, ensure good fluidization conditions, smooth combustion, avoid lime-ash coking, these end slags must in good time draining.On the other hand, heat transfer in circulating fluid bed boiler, mass transfer, burning depend on Matter Transfer in stove all to a great extent, therefore, must ensure in stove that the material having sufficient amount is to construct Matter Transfer, so the discharge capacity of end slag neither be the bigger the better, thus realize controllable slag emission and become extremely important.
As shown in Figure 1, domestic at present CFBB used fall slag device primarily of scum pipe, transport pipe and slag feed pipe composition.When actual motion, slag cooler is according to roller slag cooler the slag cooler form of main flow (existing), then ash-retention efficiency transports by cylinder decision of exerting oneself, and slag is then controlled by the accumulation of slag in slag feed pipe exit automatically in the flow rate in slag device that falls.But, along with popularization and the development of the sunken bed storage low energy consumption running technology of CFBB, in CFBB, bed material quality becomes higher, becomes thinner to coal particle size, the granularity of end slag is also corresponding thinner, thus makes fine grain particle portion in end slag become larger.Under this kind of background, follow that they are descending together because end slag can carry portion gas by burner hearth in the process that the slag device that falls is descending, finally enter slag cooler.This part gas can play fluidisation, lubrication to transporting of particle in slag cooler, thus make particle cannot form effective accumulation in slag cooler import, its flowing in slag cooler is also no longer controlled by the fin in cylinder, so the control that cylinder will lose deslagging, this is stream slag phenomenon.When stream slag phenomenon appears in slag cooler, slag flow rate is by out of hand at the end, and in a large amount of stove, material enters slag cooler at short notice, destroys cold slag, slag-draining device, and material minimizing, bed temperature in stove are declined, and may cause blowing out time serious.
The method of current control flow check slag turns down slag device portal aperture often, such as, carry out aperture adjustment by the valve 8 in Fig. 1, but this kind of method often brings stifled slag problem, and deslagging is easy to because pipeline aperture is too small and interrupts.Usually all need to recover deslagging by manually disclosing slag after stifled slag occurs, this will bring high cost of labor, so this kind of way is not the Perfected process solving slag cooler stream slag problem.
Because the above-mentioned shortcoming of prior art, need to provide a kind of novel slag device that falls.
Summary of the invention
The object of this invention is to provide a kind of slag device that falls that effectively can solve slag cooler stream slag problem.
To achieve these goals, the invention provides one to fall slag device, this slag device that falls comprises scum pipe, transports pipe and slag feed pipe, the upper port of described scum pipe is communicated with the slag-drip opening of boiler and the lower port of described scum pipe is communicated with the described upper port transporting pipe, the upper port of described slag feed pipe is communicated with the described lower port transporting pipe and the lower port of described slag feed pipe is communicated with the slag inlet of slag cooler, it is characterized in that, described in the slag device that falls also comprise and be communicated with the described pipe that transports and can transport described the air inducing assembly forming low-pressure area above pipe.
Preferably, described scum pipe and slag feed pipe are obliquely installed, described in transport pipe and vertically arrange.
Preferably, described air inducing assembly comprises air-introduced machine and air inducing bypass, and one end port of described air inducing bypass is connected with described air-introduced machine and the other end port of described air inducing bypass is communicated with the described upper port transporting pipe.
Preferably, described air inducing bypass is vertically arranged.
Preferably, described air inducing assembly also comprises gas-solid separator, and the entrance of described gas-solid separator is communicated with the upper port of described air inducing bypass, and the outlet of described gas-solid separator is connected with described air-introduced machine by air inducing air channel.
Preferably, described gas-solid separator is formed as chamber, and the cross sectional dimensions of described gas-solid separator is greater than the cross sectional dimensions of described air inducing bypass.
Preferably, described air inducing bypass and described gas-solid separator are cylindrical shape, and the internal diameter D of described gas-solid separator is greater than the internal diameter d of described air inducing bypass.
Preferably, the length of described air inducing bypass is h, and h > 2d.
Preferably, the height of described gas-solid separator is H, and H >=d.
In addition, the present invention also provides a kind of CFBB, and it comprises the above-mentioned slag device that falls.
Form low-pressure area by air inducing assembly transporting above pipe in technique scheme, when reducing the descending flowing of end slag, carry the gas flow entering slag cooler, avoid due to the lubrication of these gases, fluidization and produce and flow slag phenomenon.Meanwhile, the gas entering low-pressure area is single-phase flowing in air inducing assembly, and air quantity, wind speed easily control, and compared to the aperture regulating slag device, the work of technical scheme of the present invention is more reliable.In addition, technical scheme of the present invention does not change the circulation area on original slag dropping tube road, therefore does not affect the normal transport capability of slag device, thus can not cause stifled slag phenomenon.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 be existing fall the schematic diagram of slag device;
Fig. 2 is the schematic diagram of the slag device that falls of the specific embodiment of the invention.
Wherein,
1 scum pipe 2 transports pipe
The other pipe of 3 slag feed pipe 4 air inducing
5 gas-solid separator 6 air inducing air channels
7 air-introduced machine 8 valves
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term "up" and "down" are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
The invention provides one to fall slag device, this slag device that falls comprises scum pipe 1, transports pipe 2 and slag feed pipe 3, the upper port of scum pipe 1 is communicated with the slag-drip opening of boiler and the lower port of scum pipe 1 is communicated with the upper port transporting pipe 2, the upper port of slag feed pipe 3 is communicated with the lower port transporting pipe 2 and the lower port of slag feed pipe 3 is communicated with the slag inlet of slag cooler, wherein, the slag device that falls also comprises and transports pipe 2 and be communicated with and can transporting the air inducing assembly forming low-pressure area above pipe 2.Form low-pressure area by air inducing assembly transporting above pipe 2, when reducing the descending flowing of end slag, carry the gas flow entering slag cooler, avoid due to the lubrication of these gases, fluidization and produce and flow slag phenomenon.Meanwhile, the gas entering low-pressure area is single-phase flowing in air inducing assembly, and air quantity, wind speed easily control, and compared to the aperture regulating slag device, the work of technical scheme of the present invention is more reliable.In addition, technical scheme of the present invention does not change the circulation area on original slag dropping tube road, therefore does not affect the normal transport capability of slag device, thus can not cause stifled slag phenomenon.
Particularly, scum pipe 1, transport pipe 2 and slag feed pipe 3 is cylindrical shape (certain square tube is also feasible), and as shown in Figure 2, scum pipe 1 and slag feed pipe 3 are obliquely installed, transport pipe 2 vertically to arrange, thus make the end slag of discharging from the slag-drip opening of boiler can successfully enter slag cooler to cool.
Wherein, air inducing assembly comprises air-introduced machine 7 and air inducing bypass 4, one end port of described air inducing bypass 4 is connected with air-introduced machine 7 and the other end port of air inducing bypass 4 is communicated with the upper port transporting pipe 2, thus form low-pressure area transporting above pipe 2, gas entrained when end slag is descending in scum pipe 1 will enter air inducing bypass 4 under the effect of pressure reduction, and end slag also will greatly be reduced transporting the descending gas flow that can carry in pipe 2.Subsequently, end slag will enter slag cooler by slag feed pipe 3, a small amount of carry gas, be not enough to form gravity flow in slag cooler owing to being only attended by.As one preferred embodiment, air inducing bypass 4 is vertically arranged, and to form low-pressure area transporting directly over pipe 2, thus reaches better air inducing and gas-solid separating effect.
Further, air inducing assembly also comprises gas-solid separator 5, and the entrance of gas-solid separator 5 is communicated with the upper port of air inducing bypass 4, and the outlet of gas-solid separator 5 is connected with air-introduced machine 7 by air inducing air channel 6.Wherein, gas-solid separator 5 is formed as chamber, and structure is simple, with low cost, and the cross sectional dimensions of gas-solid separator 5 is greater than the cross sectional dimensions of air inducing bypass 4, and cross section herein specifically refers to the cross section vertical with gas flow direction.Part fine grained in end slag may be carried by air inducing and enter air inducing bypass 4, then enters gas-solid separator 5.In gas-solid separator 5, gas flow rate reduces rapidly, and the carrying capacity of gas to particle decreases, and fine grained will in this area deposition, convergence, and again descending with the form of cluster of grains, gets back to and transports pipe 2, and finally enter slag cooler.Air inducing, after gas-solid separator 5, again accelerates in air inducing air channel 6, finally enters air-introduced machine 7.By the decelerating effect of gas-solid separator 5, reduce air inducing to the carrying capacity of particle, prevent fine grained from blocking air inducing air channel 6 or damaging air-introduced machine 7, also avoid causing thin slag to run off.
Wherein, as preferred embodiment, air inducing bypass 4 and gas-solid separator 5 are cylindrical shape, the internal diameter D of gas-solid separator 5 is greater than the internal diameter d of air inducing bypass 4, to make air inducing can effectively be slowed down in gas-solid separator 5, and reduce the carrying capacity of gas to particle, prevent particle from entering air inducing air channel 6.Further, the length of air inducing bypass 4 is h, and h > 2d, to ensure that gas-solid separator 5 has enough installing spaces, there is not space interference with scum pipe 1.The height of gas-solid separator 5 is H, and H >=d, so that the process that air inducing has enough distances to complete sufficient deceleration to accelerate again, being also convenient to particle has time enough and space to stop at this, assemble, then descending.
To fall slag device relative to the tradition shown in Fig. 1, the present invention do not change original fall the circulation area of slag device, namely under not changing the precondition of end slag transport capability, utilize air inducing bypass 4 to effectively reduce end slag and carry the gas flow entered in slag cooler, to effectively prevent in slag cooler end slag from the generation of flow phenomenon; Meanwhile, by gas-solid separator 5, the end slag of part fine grain can be prevented to run off because of the rolling action of air inducing, and enter the gas of low-pressure area, after gas-solid separator, be single-phase flowing in air inducing assembly, air quantity, wind speed easily control.
The present invention also provides a kind of CFBB, and it comprises the above-mentioned slag device that falls, effectively to process the end slag of boiler.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the 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 present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. fall slag device, described fall slag device comprise scum pipe (1), transport pipe (2) and slag feed pipe (3), the upper port of described scum pipe (1) is communicated with the slag-drip opening of boiler and the lower port of described scum pipe (1) is communicated with the described upper port of managing (2) that transports, the upper port of described slag feed pipe (3) to be communicated with and the lower port of described slag feed pipe (3) is communicated with the slag inlet of slag cooler with the described lower port of managing (2) that transports, it is characterized in that, described fall slag device also comprise and manage (2) and be communicated with described transporting and can transport described the air inducing assembly that the top of managing (2) forms low-pressure area.
2. according to claim 1 fall slag device, it is characterized in that, described scum pipe (1) and slag feed pipe (3) are obliquely installed, described in transport pipe (2) and vertically arrange.
3. according to claim 2 fall slag device, it is characterized in that, described air inducing assembly comprises air-introduced machine (7) and air inducing bypass (4), and one end port of described air inducing bypass (4) is connected with described air-introduced machine (7) and the other end port of described air inducing bypass (4) is communicated with the described upper port of managing (2) that transports.
4. according to claim 3 fall slag device, it is characterized in that, described air inducing bypass (4) is vertically arranged.
5. according to claim 4 fall slag device, it is characterized in that, described air inducing assembly also comprises gas-solid separator (5), the entrance of described gas-solid separator (5) is communicated with the upper port of described air inducing bypass (4), and the outlet of described gas-solid separator (5) is connected with described air-introduced machine (7) by air inducing air channel (6).
6. according to claim 5 fall slag device, it is characterized in that, described gas-solid separator (5) is formed as chamber, and the cross sectional dimensions of described gas-solid separator (5) is greater than the cross sectional dimensions of described air inducing bypass (4).
7. according to claim 6 fall slag device, it is characterized in that, described air inducing bypass (4) and described gas-solid separator (5) are cylindrical shape, and the internal diameter D of described gas-solid separator (5) is greater than the internal diameter d of described air inducing bypass (4).
8. according to claim 7 fall slag device, it is characterized in that, the length of described air inducing bypass (4) is h, and h > 2d.
9. according to claim 7 fall slag device, it is characterized in that, the height of described gas-solid separator (5) is H, and H >=d.
10. CFBB, is characterized in that, described CFBB comprises the slag device that falls according to any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510382108.6A CN104949116B (en) | 2015-07-02 | 2015-07-02 | Fall slag device and CFBB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510382108.6A CN104949116B (en) | 2015-07-02 | 2015-07-02 | Fall slag device and CFBB |
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| Publication Number | Publication Date |
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| CN104949116A true CN104949116A (en) | 2015-09-30 |
| CN104949116B CN104949116B (en) | 2017-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510382108.6A Active CN104949116B (en) | 2015-07-02 | 2015-07-02 | Fall slag device and CFBB |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108369004A (en) * | 2015-12-07 | 2018-08-03 | 川崎重工业株式会社 | Dust removing system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06257718A (en) * | 1993-03-05 | 1994-09-16 | Babcock Hitachi Kk | Fluidized bed type boiler and method for removing medium out of it |
| CN1331398A (en) * | 2000-07-04 | 2002-01-16 | 浙江大学 | Slags cooler with dual functions of cooling and separating fine ash |
| CN202792002U (en) * | 2012-08-23 | 2013-03-13 | 华北电力科学研究院有限责任公司 | Leak prevention device for sleeve type expansion joint |
| CN204786371U (en) * | 2015-07-02 | 2015-11-18 | 中国神华能源股份有限公司 | Sediment device and circulating fluidized bed boiler fall |
-
2015
- 2015-07-02 CN CN201510382108.6A patent/CN104949116B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06257718A (en) * | 1993-03-05 | 1994-09-16 | Babcock Hitachi Kk | Fluidized bed type boiler and method for removing medium out of it |
| CN1331398A (en) * | 2000-07-04 | 2002-01-16 | 浙江大学 | Slags cooler with dual functions of cooling and separating fine ash |
| CN202792002U (en) * | 2012-08-23 | 2013-03-13 | 华北电力科学研究院有限责任公司 | Leak prevention device for sleeve type expansion joint |
| CN204786371U (en) * | 2015-07-02 | 2015-11-18 | 中国神华能源股份有限公司 | Sediment device and circulating fluidized bed boiler fall |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108369004A (en) * | 2015-12-07 | 2018-08-03 | 川崎重工业株式会社 | Dust removing system |
| CN108369004B (en) * | 2015-12-07 | 2020-03-03 | 川崎重工业株式会社 | Ash discharge system |
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| Publication number | Publication date |
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| CN104949116B (en) | 2017-09-15 |
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