CN214619501U - Flue structure and circulating fluidized bed boiler - Google Patents
Flue structure and circulating fluidized bed boiler Download PDFInfo
- Publication number
- CN214619501U CN214619501U CN202022536892.0U CN202022536892U CN214619501U CN 214619501 U CN214619501 U CN 214619501U CN 202022536892 U CN202022536892 U CN 202022536892U CN 214619501 U CN214619501 U CN 214619501U
- Authority
- CN
- China
- Prior art keywords
- flue
- turning
- tail
- wall body
- membrane
- 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.)
- Active
Links
Images
Abstract
The utility model relates to the technical field of boilers, a flue structure and circulating fluidized bed boiler are disclosed, wherein the flue structure is including connecting the turn flue before the afterbody receives the hot side, turn flue department is equipped with surely fires the structure, surely fire the structure and be used for strengthening the heat preservation effect of turn flue department makes the smoke temperature of turn flue department is in the scope that is fit for fuel burn out. The embodiment of the utility model provides a pair of flue structure and circulating fluidized bed boiler, turn flue department before the afterbody receives the hot side adds surely fires the structure for guarantee the gas temperature and in the scope that is fit for fuel burn-off, thereby form the flow field of stable burning of flue gas, make the flue gas further burn-off in turn flue department, can improve the burn-off rate of fuel, and alleviate the wearing and tearing to flue, afterbody receive the hot side, and this structure is less to original flue change, simple installation.
Description
Technical Field
The utility model relates to a boiler technical field especially relates to a flue structure and circulating fluidized bed boiler.
Background
In the circulating fluidized bed boiler, flue gas enters a turning flue after passing through a cyclone separator and then enters a tail heating surface for heat exchange. There are also a large number of unburned coal particles in the flue gas before it enters the tail heating surface. After entering the tail heating surface, the heating surface absorbs heat, the temperature of the flue gas is reduced, and at the moment, coal particles in the flue gas cannot be continuously combusted. In addition, the coal particles are in high-speed motion, so that the abrasion to the heating surface is serious. The problems of low fuel combustion efficiency and large incomplete combustion loss of the conventional circulating fluidized bed boiler are caused.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a flue structure and circulating fluidized bed boiler for solve or partially solve current circulating fluidized bed boiler fuel combustion efficiency lower, the great problem of incomplete combustion loss, improve the combustion efficiency of carbon in the flue gas and combustible gas.
The embodiment of the utility model provides a flue structure, including connecting the turn flue before the afterbody receives the hot side, turn flue department is equipped with surely fires the structure, surely fire the structure and be used for strengthening the heat preservation effect of turn flue department makes the smoke temperature of turn flue department is in the scope that is fit for fuel and burns out.
On the basis of the scheme, the combustion stabilizing structure comprises a heat insulation structure arranged around the inside of the turning flue.
On the basis of the scheme, the heat insulation structure comprises a heat storage ceramic plate layer and/or a refractory material layer.
On the basis of the scheme, the fireproof material layer is poured inside the turning flue.
On the basis of the scheme, the tail heating surface is arranged in a tail flue, and the turning flue is connected with the top of the tail flue; the tail flue comprises a membrane wall body; and a pipe laying furnace wall structure is arranged on the periphery of the membrane water-cooled wall body.
On the basis of the scheme, the turning flue is welded and connected with a header of the membrane wall body; or a sealing plate is arranged on the outer surface of the joint of the turning flue and the membrane water wall body.
On the basis of the scheme, the tail heating surface is arranged in a hanging mode or is fixed to a supporting structure, and the supporting structure is connected to the membrane water-cooled wall body or an external steel structure.
On the basis of the scheme, the membrane wall body is internally provided with a bent pipe.
On the basis of the scheme, when the supporting structure is connected to an external steel structure, the supporting structure penetrates through a gap formed by the bent pipe of the membrane wall body.
The embodiment of the utility model provides a still provide a circulating fluidized bed boiler, including above-mentioned flue structure, still include furnace and cyclone, furnace's top through export the flue with cyclone's entry links to each other, cyclone's top export links to each other with the turn flue, cyclone's bottom export through return the glassware connect in furnace.
The embodiment of the utility model provides a pair of flue structure and circulating fluidized bed boiler, turn flue department before the afterbody receives the hot side adds surely fires the structure for guarantee the gas temperature and in the scope that is fit for fuel burn-off, thereby form the flow field of stable burning of flue gas, make the flue gas further burn-off in turn flue department, can improve the burn-off rate of fuel, and alleviate the wearing and tearing to flue, afterbody receive the hot side, and this structure is less to original flue change, simple installation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a flue structure provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a circulating fluidized bed boiler according to an embodiment of the present invention.
Description of reference numerals:
1, a hearth; 2-outlet flue; 3-a cyclone separator;
4, turning a flue; 41-stable combustion structure; 5-tail flue;
6-tail heating surface; 7-membrane wall body; 8-a material returning device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the embodiment of the utility model provides a flue structure, including connecting in the afterbody turn flue 4 before receiving hot side 6, turn flue 4 department is equipped with surely fires structure 41, surely fire structure 41 and be used for strengthening the heat preservation effect of turn flue 4 department makes the smoke temperature of turn flue 4 department is in the scope that is fit for fuel burn-out.
According to the flue structure provided by the embodiment, the stable combustion structure 41 is additionally arranged at the turning flue 4 in front of the tail heating surface 6 and used for ensuring that the temperature of the flue gas is in a range suitable for burning out of fuel, so that a flow field for stable combustion of the flue gas is formed, the flue gas is further burned out of the turning flue 4, the burning out rate of the fuel can be improved, the wear to the flue and the tail heating surface 6 is reduced, and the structure is slightly changed for the original flue and is simple and convenient to install.
Furthermore, a guide plate or a swirler is additionally arranged in the turning flue 4 to rectify the flue gas.
On the basis of the above embodiment, further, the combustion stabilizing structure 41 includes a heat preservation structure disposed around the inside of the turning flue 4.
On the basis of the above embodiment, further, the heat preservation structure comprises a heat storage ceramic plate layer and/or a refractory material layer. Further, the combustion stabilizing structure 41 is arranged at one end of the turning flue 4 close to the tail heating surface 6.
In addition to the above embodiment, the refractory material layer is cast inside the turning flue 4. The heat storage ceramic slab may be anchored to the turn flue 4. And a refractory material layer and a heat storage ceramic plate layer can also be arranged at the same time.
The heat preservation structure is inside turning flue 4, keeps apart the original steel sheet lateral wall of turning flue 4 and flue gas, prevents that the heat of flue gas from touching the steel sheet. The original heat preservation and the steel sheet of turn flue 4 outside can not be high temperature resistant, and this embodiment is at steel sheet internal pouring refractory material for the surface can bear the high temperature flue gas. The common refractory material has poor heat insulation performance and high heat dissipation loss, so the method of additionally installing heat storage ceramic is adopted to ensure the temperature at the turning flue 4.
On the basis of the above embodiment, further, in order to ensure that the smoke temperature at the turning flue 4 in front of the heating surface 6 at the tail of the circulating fluidized bed is in a range suitable for coal burning, and a flow field for stable combustion of smoke is formed, this embodiment provides a stable combustion flue structure, and the effect of ensuring the smoke temperature is achieved by additionally arranging the stable combustion structure 41 in the turning flue 4 in front of the heating surface 6 at the tail. In particular, a combustion stabilizing structure 41 is additionally arranged at a turning flue 4 between the tail heating surface 6 and the cyclone separator 3. The stable combustion structure 41 is formed by arranging heat storage ceramic plates or refractory materials around the inside of the flue to form a flow field for stable combustion of flue gas, so that coal is burnt at the temperature.
The stable combustion flue structure has small change to the original flue and simple and convenient installation. The heat dissipation loss of the part of the flue is reduced, and the temperature required by burning out the coal and the combustible gas is ensured. The abrasion to the flue and the tail heating surface 6 is reduced. The burning-out rate of the coal is improved. Is beneficial to the desulfurization and denitrification in the furnace. A wide variety of materials may be used.
Further, referring to fig. 2, the flue structure provided by the embodiment includes a back flue 5, where the back flue 5 includes a membrane wall 7 and a back heating surface 6 disposed inside the membrane wall 7. Namely, a membrane water-cooled wall is arranged as a flue gas flow channel of the tail heating surface 6. The membrane type water-cooled wall body 7 is formed by sequentially welding and enclosing a plurality of steel pipes; the wholeness is stronger, and the leakproofness is better.
According to the circulating fluidized bed boiler flue structure provided by the embodiment, the membrane water wall bodies 7 are arranged around the vertical shaft of the tail heating surface 6, the peripheries of the membrane water wall bodies 7 are tightly sealed, the tail heating surface 6 is contained, the sealing performance can be improved, the membrane water wall is high in manufacturing mechanization degree, simple and convenient to mount, low in manufacturing cost, increased in heating area and beneficial to reducing tail exhaust gas temperature.
On the basis of the above embodiment, further, a pipe laying furnace wall structure is arranged on the periphery of the membrane water wall body 7.
On the basis of the above embodiment, further, the circulating fluidized bed boiler further comprises a hearth 1, a cyclone separator 3 and a turning flue 4, wherein the top of the hearth 1 is connected with an inlet of the cyclone separator 3 through an outlet flue 2, and an outlet at the top of the cyclone separator 3 is connected with the top of the membrane wall 7 through the turning flue 4. The cyclone 3 is a high temperature separator.
On the basis of the above embodiment, further, the bottom outlet of the cyclone 3 is connected to the furnace 1 through a return feeder 8.
On the basis of the above embodiment, the turning flue 4 is further welded to the header of the membrane wall 7. Or a sealing plate is arranged on the outer surface of the joint of the turning flue 4 and the membrane water wall 7 to realize sealing. Specifically, if the temperature is high or the turning flue 4 is inconvenient to weld with the header, a comb plate can be arranged on the outer surface of the membrane water wall 7 as a sealing means.
Further, the turning flue 4 can be welded and connected with a top header of the membrane wall 7. The bottom of the membrane water wall 7 is connected with a sealed flue which is connected with an ash discharge device.
On the basis of the above embodiment, further, the tail heating surface 6 sequentially includes a superheater, an economizer, and an air preheater from top to bottom.
In the hearth 1, air and fuel are mixed for combustion, formed solid particles rise along with airflow and enter a high-temperature separator through an outlet flue 2, and coarse particles are separated in the high-temperature separator and then return to the hearth 1 again through a material returning device 8 for circular combustion. The flue gas is led out from the top of the turning flue 4 through the high-temperature separator, enters a shaft type flue, namely a tail flue 5, namely a flow channel formed by a membrane wall 7, flows downwards, and is subjected to heat transfer sequentially through a high-temperature superheater, a low-temperature superheater, an economizer and an air preheater. And ash in the flue gas is discharged through the sealed flue and the ash discharge device.
On the basis of the above embodiment, further, the tail heating surface 6 is suspended or the tail heating surface 6 is fixed to a support structure, and the support structure is connected to the membrane water wall 7 or connected to an external steel structure.
On the basis of the above embodiment, furthermore, a bent pipe is arranged in the membrane wall 7.
On the basis of the above embodiment, further, when the support structure is connected to an external steel structure, the support structure penetrates through the gap formed by the bent pipe of the membrane water wall 7.
On the basis of the above embodiment, further, the tail heated surface 6 includes a coiled pipe.
Heating surfaces such as a coiled pipe and the like in the tail flue 5 can be fixed by adopting methods such as suspension, a support structure on the membrane wall, support arrangement on a steel structure and the like, and a space is made by bending pipes correspondingly to the position needing to penetrate through the membrane wall.
On the basis of the above embodiments, further, the present embodiment relates specifically to a coal-fired boiler product for central heating of utilities, and provides a circulating fluidized bed boiler structure. This embodiment is designed for the existing shaft of the tail heating surface 6 without water cooling tubes, so this technology is developed in order to improve the external wall type of the tail heating surface 6 of the circulating fluidized bed.
The embodiment provides an external wall type of an improved tail heating surface 6 of the circulating fluidized bed. And membrane water-cooled walls are arranged around the tail heating surface 6 and used as flue gas flow channels of the tail heating surface 6, and the furnace walls can adopt pipe laying furnace walls. A circulating fluidized bed boiler structure arranges membrane water-cooled wall outer walls around a vertical shaft of a tail heating surface 6. The periphery of the outer wall of the membrane water-cooled wall is tightly sealed, and the tail heating surface 6 is contained. The furnace wall outside the membrane type water-cooled wall can adopt a pipe laying furnace wall, so that the construction is simplified.
The circulating fluidized bed boiler structure has the advantages of high membrane water wall manufacturing mechanization degree and simple and convenient installation. The membrane type water-cooled wall has good sealing effect, and can reduce the heat dissipation loss and air leakage caused by the furnace wall with a brick structure. The heating area is increased, and the tail smoke exhaust temperature is favorably reduced. The construction of the furnace wall is simple and convenient, the construction period is reduced, and the manufacturing cost is low.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A flue structure comprises a turning flue connected in front of a tail heating surface, and is characterized in that a combustion stabilizing structure is arranged at the turning flue and used for enhancing the heat preservation effect at the turning flue so that the smoke temperature at the turning flue is in a range suitable for burning out fuel;
the tail heating surface is arranged in a tail flue, and the turning flue is connected with the top of the tail flue; the tail flue comprises a membrane wall body; a pipe laying furnace wall structure is arranged on the periphery of the membrane water-cooled wall body;
the turning flue is welded and connected with a header of the membrane wall body; or a sealing plate is arranged on the outer surface of the joint of the turning flue and the membrane water wall body;
the tail heating surface is arranged in a hanging mode or is fixed on a supporting structure, and the supporting structure is connected to a membrane wall body or an external steel structure;
a bent pipe is arranged in the membrane water-cooled wall body;
when the supporting structure is connected to an external steel structure, the supporting structure penetrates through a gap formed by the bent pipe of the membrane wall body.
2. The flue structure of claim 1, wherein the combustion stabilizing structure comprises a thermal insulation structure disposed around an interior of the turn flue.
3. A flue structure according to claim 2, characterized in that the insulating structure comprises a layer of heat accumulating ceramic slabs and/or a layer of refractory material.
4. The flue structure of claim 3, wherein the layer of refractory material is cast inside the turning flue.
5. A circulating fluidized bed boiler comprising the flue structure of any one of claims 1 to 4, further comprising a furnace and a cyclone separator, wherein the top of the furnace is connected to the inlet of the cyclone separator through an outlet flue, the top outlet of the cyclone separator is connected to a turning flue, and the bottom outlet of the cyclone separator is connected to the furnace through a return feeder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022536892.0U CN214619501U (en) | 2020-11-05 | 2020-11-05 | Flue structure and circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022536892.0U CN214619501U (en) | 2020-11-05 | 2020-11-05 | Flue structure and circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214619501U true CN214619501U (en) | 2021-11-05 |
Family
ID=78376149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022536892.0U Active CN214619501U (en) | 2020-11-05 | 2020-11-05 | Flue structure and circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214619501U (en) |
-
2020
- 2020-11-05 CN CN202022536892.0U patent/CN214619501U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205403139U (en) | Low nitrogen buggy boiler | |
| JPS5837402A (en) | Boiler | |
| CN104566338A (en) | Hearth structure of biomass chain boiler | |
| CN214619501U (en) | Flue structure and circulating fluidized bed boiler | |
| CN206310480U (en) | A kind of burner hearth for realizing NOx reduction reactions | |
| CN112325278A (en) | Flue structure and circulating fluidized bed boiler | |
| CN214745693U (en) | Circulating fluidized bed boiler structure | |
| CN202382251U (en) | Novel waste incineration boiler | |
| CN207035086U (en) | The low nitrogen pulverized-coal fired boiler of U-shaped flame | |
| CN208042119U (en) | Parallel-connection type coal-burning powder heat medium heater | |
| CN109253447B (en) | U-shaped flame low-nitrogen pulverized coal boiler | |
| CN2566184Y (en) | Barrel type hot-blast stove | |
| CN109631014B (en) | Pulverized coal boiler transformed by chain boiler and transformation method thereof | |
| CN219160320U (en) | Gas boiler of pulverized coal boiler transformation | |
| CN1670431A (en) | Three return stroke half fire coal, fuel oil and gas-fired smokeless boiler | |
| CN200986213Y (en) | Post-arch structure of firing space inner traverse S-type flue-gas flow | |
| CN219656035U (en) | Biomass-fired water pipe steam boiler | |
| CN2286281Y (en) | Vertical double-chamber combustion coal staggered water-tube boiler | |
| CN2349502Y (en) | Smokeless coal boiler capable of inhibiting nitrogen oxide emission by adding coal at middle part and buring at two sides | |
| CN212901466U (en) | Fixed grate type biomass bundle-shaped fuel combustion boiler | |
| CN218095908U (en) | Coal-fired industrial boiler of semi-gasification combined combustion | |
| CN2733248Y (en) | Novel hot-water boiler | |
| CN114739184B (en) | Blast furnace gas combustion heat accumulation stabilizing device | |
| CN110375327A (en) | A kind of high-efficiency cleaning excess enthalpy combustion device and its furnace body of application | |
| CN218237428U (en) | Split gas chamber combustion furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 115000 No.121 Xinlian street, Yingkou District, China (Liaoning) pilot Free Trade Zone, Yingkou City, Liaoning Province Patentee after: Lvyuan energy and Environment Technology Group Co.,Ltd. Address before: 115000 No.121 Xinlian street, Yingkou District, China (Liaoning) pilot Free Trade Zone, Yingkou City, Liaoning Province Patentee before: Liaoning Lvyuan Energy Environmental Protection Technology Group Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |