CN202253608U - Air film abrasion prevention device for water walls of circulating fluidized bed boiler and boiler - Google Patents
Air film abrasion prevention device for water walls of circulating fluidized bed boiler and boiler Download PDFInfo
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- CN202253608U CN202253608U CN2011203286534U CN201120328653U CN202253608U CN 202253608 U CN202253608 U CN 202253608U CN 2011203286534 U CN2011203286534 U CN 2011203286534U CN 201120328653 U CN201120328653 U CN 201120328653U CN 202253608 U CN202253608 U CN 202253608U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 230000002265 prevention Effects 0.000 title claims abstract description 34
- 238000005299 abrasion Methods 0.000 title abstract description 34
- 238000010276 construction Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract 1
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- 238000000034 method Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Abstract
The utility model discloses an air film abrasion prevention device for water walls of a circulating fluidized bed boiler and the boiler using the abrasion prevention device. Open pores are formed on fins between every two water wall tubes of a hearth of the circulating fluidized bed boiler, and air is induced into the hearth from air boxes outside the hearth through connecting ducts so as to produce air films, wherein the air films can damage wall pressing flows formed by descending bed material particles, change the flowing directions of the wall pressing flows and simultaneously reduce the flow velocity and concentration of the descending particles, so that erosive wear to the water wall tubes is lightened. In addition, the air film abrasion prevention device for the water walls can be adjusted under the condition of avoiding influence on the normal operation of the boiler. Moreover, the formed air films make the water walls in the hearth in an oxidizing atmosphere, so that the water wall tubes can be prevented from being corroded; and simultaneously, oxygen required by the combustion of the boiler is delivered into the boiler through different parts to realize staged combustion, so that the emissions of pollutants can be effectively reduced.
Description
Technical Field
The utility model relates to a circulating fluidized bed boiler especially relates to a circulating fluidized bed boiler water wall air film wear proof device and boiler.
Background
The circulating fluidized bed combustion technology is a clean coal combustion technology with higher marketization degree, and the circulating fluidized bed boiler is widely developed and applied at home and abroad due to the advantages of high efficiency, low pollution, wide coal adaptability, good load regulation performance and the like, wherein the key for preventing the water cooled wall of the hearth of the circulating fluidized bed boiler from being worn is long-term safe and stable operation. At present, the water wall wear-proof of the circulating fluidized bed boiler mainly adopts the technical measures of high-temperature spraying, diameter changing of the water wall pipe, water wall let pipe, wear-proof guard plate, multi-step wear-proof and the like, and the measures have good effect on solving the problem of wear of the water wall pipe.
From the hydrodynamic characteristics and the fluidization theory in the hearth, the circulating fluidized bed boiler is in a fast fluidization state in the hearth, the fast descending of high-concentration and high-flux bed materials in the hearth scours the water-cooled walls around the hearth, and the wall flow formed by the descending of the bed materials strengthens the heat exchange of the water-cooled walls, but also wears the water-cooled walls. The flow velocity, particle concentration and flux of the wall flow are gradually increased from the top to the bottom of the hearth, the multi-step abrasion prevention adopted in the prior art is to destroy the flow velocity and flow direction of the wall flow particles and weaken the abrasion of the wall flow particles on a water wall, but the technology needs to weld pins on the water wall pipe in the hearth and then add casting materials, has high requirements on the installation process, can influence the airflow in the hearth, is easy to fall off along with the abrasion in the hearth and the expansion of a boiler so as to cause the local abrasion of the water wall, and needs to recalculate the heat exchange of a heating surface and the influence on the efficiency of the boiler by adopting the abrasion prevention step technology.
Meanwhile, the conventional anti-abrasion technology is adopted, and once the installation is finished, the anti-abrasion process cannot be controlled and adjusted. For the multi-step anti-abrasion technology, if the design of the steps is too much, the load carrying capacity of the boiler and the heat absorption of other heating surfaces are affected, if the design is too little, the effective anti-abrasion effect cannot be achieved, the adjustment and the control cannot be realized in the operation process, and the number and the shape of the steps can only be designed according to experience. The high-temperature spraying anti-abrasion technology needs a large amount of capital investment, and the sprayed layer is easy to fall off to cause local abrasion.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a circulating fluidized bed boiler water wall tube's gas film wear proof device and applied this gas film wear proof device's boiler to solve current abrasionproof technique and device and can not control at boiler operation in-process and adjust, and the problem that the fund is expensive, efficiency is not high.
In order to solve the above problem, an embodiment of the utility model provides a circulating fluidized bed boiler water wall air film wear proof device, include: the circulating fluidized bed boiler comprises openings 5 arranged on fins 2 between water wall tubes 3 of the circulating fluidized bed boiler, an air box 4 arranged outside a hearth 1 of the circulating fluidized bed boiler and a connecting conduit 6 connecting the air box 4 with the openings 5; wherein the connecting duct 6 introduces wind from the wind box 4 into the circulating fluidized bed boiler furnace 1 via the openings 5, thereby forming an anti-wear film on the surface of the waterwall tubes 3.
Preferably, the circulating fluidized bed boiler water wall air film wear prevention device further comprises a guiding device 7, wherein the guiding device 7 is arranged inside the connecting conduit 6 and guides the air flow entering the circulating fluidized bed boiler furnace 1 to respectively flow to the water wall tubes 3 on two sides, so that a wear prevention air film is formed on the surfaces of the corresponding water wall tubes 3.
Preferably, the wind box 4 is connected with a primary hot air duct or a secondary hot air duct of the boiler through an air duct, and the air quantity and the air pressure are adjusted through an adjusting valve on the air duct.
Preferably, the bellows 4 is arranged as one integral bellows in the same layer.
Preferably, the air box 4 is arranged in the same layer as a plurality of independent air boxes which are connected together through air ducts.
Preferably, the guiding means 7 is arranged inside the connecting duct 6 near one end of the circulating fluidized bed boiler furnace 1.
Preferably, the guiding means 7 is streamlined along the air flow direction, so as to reduce the flow resistance against the wind.
Preferably, the openings 5 are uniformly and sequentially opened at the same level of the boiler wall to form the same layer of gas film.
Preferably, said connecting duct 6 is welded to said opening 5.
Preferably, the guide 7 has a left-right symmetrical structure.
Preferably, the air volume for the anti-abrasion air film accounts for 15% -25% of the total air volume of the hearth.
In order to solve the problems, the utility model also provides a boiler, which comprises a circulating fluidized bed boiler furnace 1, fins 2 and water-cooled wall tubes 3, wherein the fins 2 are arranged between the water-cooled wall tubes 3, and the boiler also comprises an air box 4, an opening 5 and a connecting conduit 6; wherein the opening 5 is arranged on the fin 2 between the water wall tubes 3 of the circulating fluidized bed boiler hearth 1; the air box 4 is arranged outside the circulating fluidized bed boiler furnace 1, and the air box 4 is communicated with the opening 5 through the connecting conduit 6; the connecting duct 6 introduces wind from the wind box 4 into the circulating fluidized bed boiler furnace 1 via the openings 5, thereby forming an anti-wear air film on the surface of the waterwall tubes 3.
Preferably, the boiler further comprises a guiding device 7, wherein the guiding device 7 is arranged inside the connecting conduit 6 and guides the gas flow entering the furnace 1 of the circulating fluidized bed boiler to flow towards the water wall tubes 3 on both sides respectively, so as to form an anti-wear gas film on the surfaces of the corresponding water wall tubes 3.
Preferably, the wind box 4 of the boiler is connected with the primary hot air duct or the secondary hot air duct of the boiler through an air duct, and the air quantity and the air pressure are adjusted through an adjusting valve on the air duct.
Preferably, the windboxes 4 of the boiler are arranged in one and the same layer as one integral windbox.
Preferably, the wind boxes 4 of the boiler are arranged in the same layer as a plurality of independent wind boxes which are connected together by air ducts.
Preferably, the guiding means 7 of the boiler are arranged inside the connecting duct 6 near one end of the furnace 1 of the circulating fluidized bed boiler.
Preferably, the guiding means 7 of the boiler are streamlined in the direction of the gas flow, so that the flow resistance against the wind is reduced.
Preferably, the boiler openings 5 are opened uniformly and sequentially at the same level of the boiler wall to form a gas film of the same layer.
Preferably, the connecting duct 6 of the boiler is welded to the opening 5.
Preferably, the guiding means 7 of the boiler is of a left-right symmetrical construction.
Preferably, the air volume for the anti-abrasion air film accounts for 15% -25% of the total air volume of the hearth.
The utility model discloses circulating fluidized bed boiler water wall air film wear proof device and use this wear proof device's boiler, thereby accessible connecting tube introduce wind in the furnace from the outside bellows of furnace and produce the air film, and this air film can destroy the wainscot flow that the bed material granule that descends formed, has changed the flow direction of wainscot flow, reduces the velocity of flow and the concentration of descending the granule simultaneously to alleviate the erosive wear to the water wall pipe. And the pressure of the air box is adjusted, so that the thickness of the air film can be adjusted during the operation of the boiler, and the adjustment of the water-cooled wall air film anti-abrasion device is realized under the condition that the normal operation of the boiler is not influenced. And the gas film that the device formed makes this region be in the oxidizing atmosphere in the furnace, can prevent the corruption of water wall pipe, sends into the boiler through different positions with the required oxygen of boiler combustion simultaneously, has realized the staged combustion, can reduce pollutant discharge effectively.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic view of a boiler furnace having a circulating fluidized bed boiler water wall air film wear prevention device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sectional top view and bellows therein of a boiler having a circulating fluidized bed boiler water wall air film wear prevention device according to an embodiment of the present invention;
FIG. 3 is a schematic view of a partial water wall tube and a hole in the side of a boiler furnace having a circulating fluidized bed boiler water wall air film wear prevention device according to an embodiment of the present invention;
FIG. 4 is a view from the direction A-A of FIG. 3 showing a schematic view of the connection of the bellows and the connecting conduit;
FIG. 5 is a view taken along the direction B-B in FIG. 4, showing a schematic view of a plurality of windboxes arranged in the height direction of the furnace;
FIG. 6 is a schematic horizontal sectional structure view of a single connecting conduit and a guiding device of a circulating fluidized bed boiler water wall air film abrasion-proof device according to an embodiment of the present invention;
fig. 7 is a flowchart of a method for utilizing the air film wear prevention device for the water wall of the circulating fluidized bed boiler according to an embodiment of the present invention.
Reference numerals:
1. a circulating fluidized bed boiler hearth; 2. a fin; 3. a water wall tube; 4. an air box; 5. opening a hole; 6. connecting a conduit; 7. a guide device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic view of a boiler furnace with a circulating fluidized bed boiler water wall air film wear prevention device according to an embodiment of the present invention. Fig. 2 is a sectional top view of a boiler having a water wall air film wear prevention device of a circulating fluidized bed boiler and a schematic diagram of an air box therein according to an embodiment of the present invention. FIG. 3 is a schematic view of a partial water wall tube and a hole in the side of a boiler furnace having a circulating fluidized bed boiler water wall air film wear prevention device according to an embodiment of the present invention; FIG. 4 is a view from the direction A-A of FIG. 3, showing a schematic view of the connection of the bellows and the connecting conduit. FIG. 5 is a view taken along the direction B-B in FIG. 4, showing a schematic view of the multi-layered windbox arranged in the height direction of the furnace.
As shown in fig. 1 and fig. 2, the circulating fluidized bed boiler of the present embodiment includes a hearth 1 of the circulating fluidized bed boiler, fins 2, and water wall tubes 3, wherein the water wall tubes 3 are connected by the fins 2.
The boiler of the present embodiment comprises a circulating fluidized bed boiler water wall air film wear prevention device, wherein, as shown in fig. 2, the air film wear prevention device of the boiler comprises openings 5 arranged on the fins 2 between the water wall tubes 3 of the hearth of the circulating fluidized bed boiler. Wherein, the fins 2 are provided with holes which can be square holes or elliptical holes, and the number and the positions of the holes are determined according to the technological parameters of the boiler. The openings 5 are arranged at different elevations of the boiler, and a plurality of layers of air films are formed along the height direction of the boiler by spraying anti-abrasion air, so that the medium flow direction of wall-attached descending flow is damaged, and the water wall tubes 3 are prevented from being scoured and worn; and the same elevation of the boiler is provided with the holes 5, and the holes are uniformly and sequentially formed along the four walls of the boiler at the same elevation, so that the anti-abrasion gas film at the same layer can be formed.
In this embodiment, the air film anti-wear device in the boiler further includes an air box 4 disposed outside the circulating fluidized bed boiler furnace 1, and the opening 5 is communicated with the air box 4 through a connecting conduit 6. The wind box 4 is arranged outside the furnace, and according to the process requirements, an integral wind box can be arranged on the same layer, or a plurality of independent wind boxes can be arranged, as shown in fig. 4, the wind box is a schematic view of an integral wind box arranged on the same layer of the boiler. Or according to the anti-abrasion requirement, a plurality of layers of openings 5 and corresponding air boxes 4 can be arranged at different elevations of the hearth so as to increase the anti-abrasion force, as shown in fig. 5, a schematic diagram of the plurality of layers of air boxes arranged along the height direction of the hearth is shown. And the air boxes on different layers are connected through air channels, and adjusting valves are respectively arranged on the air channels, so that the air volume and the air pressure entering each air box can be controlled. The air box 4 is connected with a hot primary air channel or a hot secondary air channel of the boiler through an air channel, and the hot primary air or the hot secondary air is directly used as anti-abrasion air, so that the emission of pollutants is reduced, and the utilization efficiency of the boiler is improved.
The air quantity of the anti-abrasion air is adjusted according to the working condition requirements of the circulating fluidized bed boiler such as starting, stopping, lifting load and the like during operation, and the air quantity of the boiler is controlled to be 15% -25% of the total air quantity during normal operation.
Fig. 6 is a schematic diagram of a horizontal section structure of a single connecting conduit and a guiding device of a circulating fluidized bed boiler water wall air film abrasion-proof device according to an embodiment of the present invention.
In this embodiment, the connecting ducts 6 can be welded to the openings 5 in the fins 2 of the water wall 3, and the other end is connected to the wind box 4, and wear-resistant air is introduced into the furnace 1 via the respective connecting duct 6. The guiding device 7 is arranged inside the connecting guide pipe 6 and close to one end of the hearth 1, and is used for changing the direction of anti-abrasion wind sprayed into the hearth, flowing to the water wall tubes on two sides at a certain angle and forming a layer of gas film on the surfaces of the water wall tubes. The guide device is in a streamline shape along the airflow direction, so that the flow resistance of the anti-abrasion wind is reduced.
In this embodiment, the guiding device 7 may be configured as a bilateral symmetry structure, the inlet portion of the guiding device divides the connecting conduit 6 into three channels, the flow area of the middle channel is smaller than those of the two sides, the flow area of the middle channel is gradually increased along the airflow direction, and the flow areas of the two sides of the connecting conduit are smaller than those of the middle channel, so as to guide the anti-wear wind to flow forward along the two sides of the connecting conduit under the action of the guiding device 7.
The multiple layers of air boxes are connected with a primary hot air duct or a secondary hot air duct of the boiler through air ducts, the air quantity and the air pressure are adjusted through adjusting valves on the air ducts, so that the thickness and the rigidity of each layer of air film are adjusted, and an anti-abrasion air film formed in the circulating fluidized bed boiler hearth 1 damages the direction and the flow speed of wall-attached flow descending particle flow, so that the erosion abrasion to water cooling wall pipes is reduced.
Fig. 7 is a flowchart of a method for utilizing the air film wear prevention device for the water wall of the circulating fluidized bed boiler according to an embodiment of the present invention. As shown in the figure, the utility model discloses circulating fluidized bed boiler water-cooling wall air film abrasionproof method of embodiment includes:
step S101, holes are formed in fins among water wall tubes of a hearth of the circulating fluidized bed boiler. And holes are formed in the fins, the holes can be square holes or elliptical holes, and the number and the positions of the holes are determined according to the process parameters of the boiler. The openings are arranged at different elevations of the boiler, and a plurality of layers of air films are formed along the height direction of the boiler by spraying anti-abrasion air, so that the medium flow direction of wall-attached descending flow is damaged, and the water wall tubes are prevented from being scoured and worn; and the same elevation of the boiler is provided with holes, and the holes are uniformly and sequentially formed along the four walls of the boiler at the same elevation, so that the anti-abrasion gas film at the same layer can be formed.
And S102, feeding the hot primary air or the hot secondary air of the boiler into a hearth of the circulating fluidized bed boiler through the opening by the air box. Depending on the process requirements and wear requirements, an integral bellows may be provided in the same layer, or a plurality of separate bellows may be provided. The air boxes on different layers are connected through air channels, and adjusting valves are respectively arranged on the air channels, so that the air volume and the air pressure entering each air box can be controlled. The air box is connected with a hot primary air channel or a hot secondary air channel of the boiler through the air channel, and the hot primary air or the hot secondary air is directly used as anti-abrasion air, so that the emission of pollutants is reduced, and the utilization efficiency of the boiler is improved.
And S103, forming an anti-wear air film on the surface of the water wall tube by the hot primary air or the hot secondary air. Wind is led into the hearth from the wind box outside the hearth through the connecting guide pipe, so that an anti-abrasion air film is generated, the air film can destroy the wall flow formed by descending bed material particles, the flow direction of the wall flow is changed, and the flow speed and concentration of the descending particles are reduced, so that the erosion and abrasion of the water wall pipe are reduced.
The utility model discloses circulating fluidized bed boiler water wall air film wear proof device and use this wear proof device's boiler, thereby accessible connecting tube introduce wind in the furnace from the outside bellows of furnace and produce the air film, and this air film can destroy the wainscot flow that the bed material granule that descends formed, has changed the flow direction of wainscot flow, reduces the velocity of flow and the concentration of descending the granule simultaneously to alleviate the erosive wear to the water wall pipe. And the pressure of the air box is adjusted, so that the thickness of the air film can be adjusted during the operation of the boiler, and the adjustment of the water-cooled wall air film anti-abrasion device is realized under the condition that the normal operation of the boiler is not influenced. And the gas film that the device formed makes this region be in the oxidizing atmosphere in the furnace, can prevent the corruption of water wall pipe, sends into the boiler through different positions with the required oxygen of boiler combustion simultaneously, has realized the staged combustion, can reduce pollutant discharge effectively.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (22)
1. A circulating fluidized bed boiler water wall air film wear prevention device, its characterized in that, circulating fluidized bed boiler water wall air film wear prevention device includes:
the circulating fluidized bed boiler comprises holes (5) arranged on fins (2) between water wall tubes (3) of the circulating fluidized bed boiler, an air box (4) arranged outside a hearth (1) of the circulating fluidized bed boiler and a connecting conduit (6) for connecting the air box (4) with the holes (5); wherein,
the connecting duct (6) introduces wind from the wind box (4) into the circulating fluidized bed boiler furnace (1) via the openings (5) so that an anti-wear gas film is formed on the surface of the water wall tubes (3).
2. The circulating fluidized bed boiler water wall air film wear prevention device of claim 1, characterized in that the circulating fluidized bed boiler water wall air film wear prevention device further comprises a guiding device (7), the guiding device (7) is arranged inside the connecting conduit (6) and guides the air flow entering the hearth (1) of the circulating fluidized bed boiler to flow towards the water wall tubes (3) at two sides respectively, so as to form a wear prevention air film on the surfaces of the corresponding water wall tubes (3).
3. The circulating fluidized bed boiler water wall air film wear prevention device of claim 1, characterized in that the air box (4) is connected with a boiler hot primary air channel or a boiler hot secondary air channel through an air channel, and the air quantity and the air pressure are adjusted through adjusting valves on the air channel.
4. Circulating fluidized bed boiler water wall air film wear prevention device according to claim 3, characterized in that the wind boxes (4) are arranged as one integral wind box in the same layer.
5. A circulating fluidized bed boiler water wall air film wear prevention device according to claim 3, characterized in that the air box (4) is provided as a plurality of independent air boxes on the same layer, and the independent air boxes are connected together through air ducts.
6. Circulating fluidized bed boiler water wall air film wear prevention device according to claim 2, characterized in that the guiding device (7) is arranged inside the connecting duct (6) near one end of the circulating fluidized bed boiler furnace (1).
7. The circulating fluidized bed boiler water wall air film wear prevention device of claim 6, characterized in that the guide device (7) is streamline-shaped along the air flow direction, thereby reducing the flow resistance of the wear prevention wind.
8. Circulating fluidized bed boiler water wall air film wear prevention device according to claim 1, characterized in that the openings (5) are uniformly and sequentially opened at the same level of the boiler wall to form the air film of the same layer.
9. Circulating fluidized bed boiler water wall gas film wear prevention device according to claim 1, characterized in that the connecting conduit (6) is welded on the aperture (5).
10. Circulating fluidized bed boiler water wall air film wear prevention device according to claim 2, characterized in that the guiding device (7) is of a left-right symmetrical structure.
11. The circulating fluidized bed boiler water wall air film wear prevention device of claim 1, wherein the air volume for the wear prevention air film accounts for 15-25% of the total air volume of the hearth.
12. A boiler comprises a circulating fluidized bed boiler hearth (1), fins (2) and water wall tubes (3), wherein the fins (2) are arranged between the water wall tubes (3), and is characterized by further comprising an air box (4), an opening (5) and a connecting conduit (6); wherein,
the openings (5) are arranged on the fins (2) between the water wall tubes (3) of the circulating fluidized bed boiler hearth (1); the air box (4) is arranged outside the circulating fluidized bed boiler furnace (1), and the air box (4) is communicated with the opening (5) through the connecting guide pipe (6);
the connecting duct (6) introduces wind from the wind box (4) into the circulating fluidized bed boiler furnace (1) via the openings (5) so that an anti-wear gas film is formed on the surface of the water wall tubes (3).
13. A boiler according to claim 12, characterized in that the boiler further comprises guiding means (7), the guiding means (7) being arranged inside the inlet connection duct (6) for guiding the flow of gas into the furnace (1) of the circulating fluidized bed boiler towards the respective side waterwall tubes (3) so as to form a wear protection film on the surface of the respective waterwall tubes (3).
14. The boiler according to claim 12, characterized in that the wind boxes (4) are connected with the primary hot air duct or the secondary hot air duct of the boiler through air ducts, and the air quantity and the air pressure are adjusted through adjusting valves on the air ducts.
15. A boiler according to claim 14, characterized in that the windbox (4) is arranged as one integral windbox in the same layer.
16. A boiler according to claim 14, characterized in that the wind box (4) is arranged in the same layer as a number of separate wind boxes, which are connected together by means of wind ducts.
17. A boiler according to claim 13, characterized in that the guiding means (7) are arranged inside the connecting duct (6) near one end of the circulating fluidized bed boiler furnace (1).
18. The boiler according to claim 17, wherein the guiding means (7) is streamlined in the direction of the gas flow, thereby reducing the flow resistance against the wind.
19. The boiler according to claim 12, wherein the openings (5) are opened in a uniform sequence at the same level of the boiler wall to form a gas film of the same layer.
20. A boiler according to claim 12, characterized in that said connecting duct (6) is welded on said opening (5).
21. A boiler according to claim 13, characterized in that said guiding means (7) is of a left-right symmetrical construction.
22. The boiler of claim 12, wherein the air volume for the anti-wear air film accounts for 15% -25% of the total air volume of the furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203286534U CN202253608U (en) | 2011-09-05 | 2011-09-05 | Air film abrasion prevention device for water walls of circulating fluidized bed boiler and boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203286534U CN202253608U (en) | 2011-09-05 | 2011-09-05 | Air film abrasion prevention device for water walls of circulating fluidized bed boiler and boiler |
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| CN2011203286534U Expired - Lifetime CN202253608U (en) | 2011-09-05 | 2011-09-05 | Air film abrasion prevention device for water walls of circulating fluidized bed boiler and boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980178A (en) * | 2011-09-05 | 2013-03-20 | 华北电力科学研究院有限责任公司 | Circulating fluidized bed boiler water wall air film wear-preventive device, circulating fluidized bed boiler water wall air film wear-preventive method and boiler |
| CN103017150A (en) * | 2012-12-27 | 2013-04-03 | 青岛胜利锅炉有限公司 | Structure for blowing adhered air to furnace body in segmented manner |
| CN103438442A (en) * | 2013-08-22 | 2013-12-11 | 华北电力大学 | Wear preventing device for water-cooled wall wear area of circulating fluidized bed boiler |
| CN114740916A (en) * | 2022-04-06 | 2022-07-12 | 珠海格力节能环保制冷技术研究中心有限公司 | Air conditioner and fan combined control method and device and storage medium |
-
2011
- 2011-09-05 CN CN2011203286534U patent/CN202253608U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980178A (en) * | 2011-09-05 | 2013-03-20 | 华北电力科学研究院有限责任公司 | Circulating fluidized bed boiler water wall air film wear-preventive device, circulating fluidized bed boiler water wall air film wear-preventive method and boiler |
| CN102980178B (en) * | 2011-09-05 | 2015-07-15 | 华北电力科学研究院有限责任公司 | Circulating fluidized bed boiler water wall air film wear-preventive device, circulating fluidized bed boiler water wall air film wear-preventive method and boiler |
| CN103017150A (en) * | 2012-12-27 | 2013-04-03 | 青岛胜利锅炉有限公司 | Structure for blowing adhered air to furnace body in segmented manner |
| CN103438442A (en) * | 2013-08-22 | 2013-12-11 | 华北电力大学 | Wear preventing device for water-cooled wall wear area of circulating fluidized bed boiler |
| CN114740916A (en) * | 2022-04-06 | 2022-07-12 | 珠海格力节能环保制冷技术研究中心有限公司 | Air conditioner and fan combined control method and device and storage medium |
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