CN222669976U - A circulating fluidized bed boiler - Google Patents
A circulating fluidized bed boiler Download PDFInfo
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- CN222669976U CN222669976U CN202323456137.1U CN202323456137U CN222669976U CN 222669976 U CN222669976 U CN 222669976U CN 202323456137 U CN202323456137 U CN 202323456137U CN 222669976 U CN222669976 U CN 222669976U
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- 238000001816 cooling Methods 0.000 claims description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 239000012528 membrane Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 47
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 19
- 239000003546 flue gas Substances 0.000 description 19
- 239000003245 coal Substances 0.000 description 17
- 238000011109 contamination Methods 0.000 description 13
- 239000000779 smoke Substances 0.000 description 12
- 229910052783 alkali metal Inorganic materials 0.000 description 8
- 150000001340 alkali metals Chemical class 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
本实用新型涉及锅炉技术领域，公开了一种循环流化床锅炉，包括相互连通的风室、炉膛，还包括与炉膛连通的后竖井烟道，炉膛内设有过热器。本实用新型解决了现有技术存在的难以在低成本且不降低锅炉保汽温能力的前提下实现循环流化床锅炉的长周期可靠性的问题。
The utility model relates to the technical field of boilers, and discloses a circulating fluidized bed boiler, including a wind chamber and a furnace that are interconnected, and also includes a rear shaft flue that is connected to the furnace, and a superheater is arranged in the furnace. The utility model solves the problem of the prior art that it is difficult to achieve long-term reliability of the circulating fluidized bed boiler at a low cost and without reducing the boiler's steam temperature retention capacity.
Description
Technical Field
The utility model relates to the technical field of boilers, in particular to a circulating fluidized bed boiler.
Background
The research and study in the industry have conducted for many years to have a deep knowledge on the characteristics of high sodium potassium coal, and the pollution capability and the smoke temperature correlation of the high sodium coal are strong, namely, when the smoke temperature is lower than 650 ℃, the pollution of a heating surface is lighter, even no pollution exists, the pollution is rapidly aggravated in the range of 650-700 ℃, and the pollution is serious at the smoke temperature above 700 ℃.
The circulating fluidized bed boiler is difficult to form contamination on the heating surface in the boiler due to the scouring of high-concentration circulating ash in the hearth, the main contamination interval is the high-temperature section of the rear vertical shaft flue, the strong contamination area above 650 ℃ of the tail vertical shaft of the conventional circulating fluidized bed boiler is generally provided with the superheater convection heating surface, and once contamination and blockage occur, the main steam parameters of the boiler are seriously affected. And superheater wall temperatures are typically high, alkali metal corrosion problems have arisen in some power plants.
Based on the above research conclusion, a series of schemes for preventing the heating surface from being contaminated have been formed in the industry aiming at the problems of the circulating fluidized bed boiler, and the main conditions are as follows:
(1) And reducing the inlet smoke temperature of the convection heating surface of the tail shaft superheater to below 650 ℃ by adopting a cooling type air flue. The scheme has the advantages that the heat exchange capacity of the cooling type flue is limited, so that the purpose can be achieved by relying on a large amount of heating surface area, the heat exchange of the superheater convection heating surface is also influenced after the smoke temperature at the inlet of the superheater convection heating surface is reduced, the steam temperature is increased by adding a large amount of heating surface, the whole occupied area is large, the cost is high, and the cooling type flue cannot be applied to technical improvement projects of a power station boiler.
(2) The pitch of the convection heating surface of the superheater in the high-temperature region of the tail vertical shaft is directly increased, the contamination period is prolonged, the contamination condition of the heating surface is gradually increased along with the prolonged operation time of the boiler, the steam temperature reaching capability of the boiler is gradually reduced, and the problem of alkali metal corrosion is easily caused due to the high wall temperature characteristic of the superheater after contamination. In order to increase the heat absorption of the superheater, the number of longitudinal rows of the convection heating surfaces is increased, the overall height of the rear vertical shaft is increased, the space is limited, and the method is also difficult to apply to technical improvement projects of a power station boiler.
(3) And arranging a water-cooling evaporation tube bundle in a high-temperature region of the tail vertical shaft to reduce the smoke temperature of the inlet of the convection heating surface of the superheater to below 650 ℃. According to the scheme, the low-temperature area is provided with the superheater convection heating surface, the heat exchange of the superheater convection heating surface is also influenced after the smoke temperature at the inlet of the superheater convection heating surface is reduced, a large number of heating surfaces are required to be increased to improve the steam temperature, the steam-retaining temperature capacity of the boiler is reduced, and the cost is increased.
(4) The tail vertical shaft high temperature area is cooled by a water cooling screen, and the heat absorption of the superheater is increased by an external bed. The tail screen type heating surface of the scheme has limited integral heat exchange capacity, a large number of water cooling screens are required to be added, the external bed heat exchanger is inconvenient to overhaul, and the later operation and maintenance difficulty of the boiler is high.
(5) And recycling low-temperature flue gas. According to the scheme, clean flue gas after dust removal is led back to the inlet of the back shaft flue, mixed with high-temperature flue gas and cooled to be below 650 ℃ and then enters the convection heating surface, the scheme is simple, but the required low-temperature recycling flue gas amount exceeds 30% of the boiler flue gas amount, so that the convection heating surface of the back shaft is ensured not to be worn, the section of the back shaft flue is required to be greatly increased, the cost is high, and the steam-retaining capacity of the boiler is obviously reduced after the flue temperature of the inlet of the convection heating surface of the superheater is reduced.
In summary, the existing technical scheme for preventing the high sodium potassium coal from being polluted generally has the problems of high cost, gradually reduced steam-retaining temperature capability along with the lengthening of the operation time of the boiler, alkali metal corrosion after the pollution of a convection heating surface, inconvenient maintenance, incapability of being suitable for technical transformation optimization of the operated unit and the like.
Disclosure of utility model
In order to overcome the defects of the prior art, the utility model provides the circulating fluidized bed boiler, which solves the problem that the long-period reliability of the circulating fluidized bed boiler is difficult to realize under the premise of low cost and no reduction of the steam-retaining capacity of the boiler in the prior art.
The utility model solves the problems by adopting the following technical scheme:
The circulating fluidized bed boiler comprises an air chamber and a hearth which are communicated with each other, and also comprises a back vertical shaft flue which is communicated with the hearth, wherein a superheater is arranged in the hearth.
As a preferred technical scheme, the superheater comprises one or more of a high-temperature superheater, a medium-temperature superheater and a low-temperature superheater.
As a preferable technical scheme, the device also comprises a water cooling tube bundle arranged in the rear vertical shaft flue.
As a preferable technical scheme, the device also comprises an economizer arranged in the rear vertical shaft flue, and the economizer is arranged below the water cooling tube bundle.
As a preferred technical scheme, the air preheater arranged in the rear vertical shaft flue is also included.
As a preferable technical scheme, the water-cooling tube bundle is of a serpentine tube structure.
As a preferable technical scheme, a separator is arranged in a communication pipeline between the hearth and the rear vertical shaft flue.
As a preferred embodiment, the separator comprises a separator a and a separator B.
As a preferable technical scheme, the separator and the water-cooling tube bundle are of a steam-cooling film wall structure, and the economizer and the air preheater are of steel plate structures.
As a preferable technical scheme, the hearth is a structure surrounded by membrane walls.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The superheater is suspended in the hearth, so that the pollution and coking of a heating surface can be avoided under the scouring of high-concentration circulating ash in the hearth, and the heat exchange temperature and pressure in the hearth are higher, thereby being beneficial to improving the steam temperature reaching capability of the boiler;
(2) The water-cooling tube bundles with large pitch are arranged in the high smoke temperature area of the back vertical shaft flue for cooling, so that the channels can be prevented from being bridged and blocked, the convection heating surface is prevented from being corroded by alkali metal, the water-cooling tube bundles do not directly affect the steam temperature of the boiler, even if pollution occurs, the steam temperature of the boiler is not affected to reach the standard, the arrangement position of the water-cooling tube bundles is the space occupied by the convection heating surface of the superheater of the conventional circulating fluidized bed boiler, the cost of the boiler is not increased additionally, and the reliability of long-term continuous operation of the boiler can be ensured.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
The reference numerals and the corresponding names thereof are 1-wind chamber, 2-furnace, 3-high temperature superheater, 4-medium temperature superheater, 5-low temperature superheater, 6-separator A, 7-separator B, 8-back shaft flue, 9-water cooling tube bundle, 10-economizer and 11-air preheater.
Detailed Description
The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.
Example 1
As shown in figure 1, the circulating fluidized bed boiler for burning high-sodium potassium coal can effectively avoid the influence on the steam temperature after contamination with low cost, avoid the reduction of the steam-retaining temperature capability caused by the excessively low smoke temperature of the inlet of the convection heating surface of the superheater, avoid alkali metal corrosion caused by the contamination of the convection heating surface of the tail superheater, and be highly suitable for the technical transformation optimization of the existing operation units.
The utility model provides a circulating fluidized bed boiler for burning high-sodium potassium coal, which can realize the mixed combustion or pure combustion of high-proportion high-sodium potassium coal under the premise of not reducing the steam-retaining capacity of the boiler at relatively low cost, ensure the long-period reliability of the circulating fluidized bed boiler for burning high-sodium potassium coal, and is also suitable for the technical transformation of most of the put-into-service high-sodium potassium coal boilers.
The principle of CFB boilers is a disclosed technology and the present utility model will not be repeated. The utility model provides a circulating fluidized bed boiler burning high-sodium potassium coal, as shown in figure 1,
1. A circulating fluidized bed boiler for burning high sodium potassium coal is composed of air chamber, furnace, cyclone separator, tail vertical flue, water-cooled evaporating tube bundle, economizer, air preheater and superheater. A feed back device is arranged below the cyclone separator and is used for feeding the separated solid materials back to the hearth. The furnace is surrounded by membrane wall, the separator and the back shaft flue adopt the structure of the steam cooling membrane wall, the lower part of the furnace is provided with a fuel feeding device and a secondary air pipe, the bottom of the furnace is provided with a fluidized bed, and the fluidized bed is provided with an ignition device and primary air.
2. The low-temperature superheater, the medium-temperature superheater and the high-temperature superheater are all arranged in the hearth in a screen-type structure, and because a large amount of circulating ash is flushed in the hearth in the operation process of the circulating fluidized bed boiler, even if high-sodium potassium coal is used for combustion, the screen-type heating surfaces in the hearth can not be coked, stained and the like.
3. The tail vertical shaft is not provided with a superheater convection heating surface, a water cooling tube bundle, an economizer, an air preheater and other convection heating surfaces are sequentially arranged from top to bottom, a large-pitch water cooling tube bundle with a serpentine pipe structure is adopted in a high-temperature area to reduce the temperature of flue gas, the water cooling tube bundle adopts a large pitch, the increase of resistance caused by the passage bridging and blocking can be avoided, the boiler output is influenced, the wall temperature of the water cooling tube bundle is relatively low, the alkali metal corrosion of the wall after contamination can be avoided, the water cooling tube bundle does not directly influence the steam temperature of a boiler, the steam temperature of the boiler is not influenced to reach the standard even if contamination occurs, and the arrangement position of the water cooling tube bundle is the space occupied by the superheater convection heating surface of a conventional circulating fluidized bed boiler, and the boiler cost is not increased additionally.
4. The boiler steam-water system comprises an economizer, a boiler barrel, a water cooling system, a low-temperature superheater, a medium-temperature superheater, a high-temperature superheater and connecting pipelines thereof. The water supply flows through the economizer and then enters the boiler barrel, the boiler water in the boiler barrel enters water-cooling heating surfaces such as a hearth water-cooling wall, a water-cooling tube bundle and the like through the down tube and is heated into a steam-water mixture, the steam-water mixture returns to the boiler barrel for steam-water separation, and the separated boiler water (saturated water) enters the down tube to participate in the next circulation. The separated saturated steam flows through the cooling cyclone separator, the rear vertical shaft flue wall, the low pass, the medium pass and the high pass, is led out after being heated, and is sent into a high-pressure cylinder of the steam turbine to do work.
5. When the boiler operates, fuel enters the hearth to burn, hot flue gas generated by burning transfers a part of heat to the water-cooled wall of the hearth, then the hot flue gas flows through the cyclone separator to carry out gas-solid separation, the separated cleaner flue gas enters the back vertical shaft flue, and the separated cleaner flue gas sequentially flows through the water-cooled tube bundle, the economizer and the air preheater which are arranged in the back flue to release heat and then leaves the boiler, and enters the chimney after passing through the tail flue gas purification system and is discharged to the atmosphere.
The utility model provides a circulating fluidized bed boiler burning high-sodium potassium coal, which has the following characteristics:
The boiler overall structure comprises an air chamber 1, a hearth 2, a high-temperature superheater 3, a medium-temperature superheater 4, a low-temperature superheater 5, a separator A6, a separator B7, a back shaft flue 8, a water-cooling tube bundle 9, an economizer 10 and an air preheater 11.
A hearth formed by adopting a full-film water-cooled wall structure is provided with a water-cooled tube panel heating surface, a superheater heating surface, a coal supply port and a secondary air port along the width direction, a water-cooled air chamber formed by bending water-cooled wall tubes is arranged at the bottom of the hearth, the air chamber is connected with an ignition air channel under a bed, each ignition air channel is provided with an oil burner for heating bed materials, and a return device return port, a secondary air port and a slag discharge port are arranged on the rear wall of the hearth along the width direction.
Preferably, a cyclone separator is adopted for gas-solid separation, a material return device is arranged at the lower end of the cyclone separator, and materials separated by the cyclone separator are directly returned to the hearth through the material return device.
Preferably, the screen-type superheater heating surfaces are all arranged in the hearth, a large amount of circulating ash is flushed in the running process in the hearth of the circulating fluidized bed boiler, the contamination of the superheater heating surfaces can be avoided, the problems that the steam temperature of the boiler is affected and alkali metal corrosion of the superheater convection heating surfaces is avoided after the contamination of the high-sodium-potassium coal is used are solved.
Preferably, a rear shaft flue is adopted, and a water cooling tube bundle, an economizer and an air preheater are sequentially arranged from top to bottom. The water-cooling tube bundles of the serpentine tube structure are adopted for cooling in the high-temperature area, and meanwhile, the water-cooling tube bundles are arranged in a large pitch, so that the pollution problem caused by burning high-sodium potassium coal can be effectively resisted, the influence on the operation of the boiler after pollution is reduced, and the long-period operation reliability of the boiler is ensured.
Preferably, all the superheater heating surfaces (low-temperature superheater, medium-temperature superheater and high-temperature superheater) adopt a screen type heating surface structure and are arranged in the hearth;
preferably, the cyclone separator adopts a steam cooling type or heat insulation type to carry out gas-solid separation;
Preferably, the tail flue wall adopts steam cooling or heat insulation, and a water cooling tube bundle is arranged in a high smoke temperature zone of the tail vertical shaft of the boiler;
preferably, the boiler tail shaft economizer can be arranged in a single stage or in multiple stages, and can also be arranged in a grading manner, and an SCR space can be arranged or reserved between the upper and lower stage economizers.
The utility model provides a circulating fluidized bed boiler scheme for burning high-sodium potassium coal, which aims at the pollution and corrosion characteristics of the high-sodium potassium coal, and the arrangement position of a heating surface of the circulating fluidized bed boiler is planned again, so that the following effects can be achieved:
(1) The superheater is suspended in the hearth, so that the pollution and coking of a heating surface can be avoided under the scouring of high-concentration circulating ash in the hearth, and the heat exchange temperature and pressure in the hearth are higher, thereby being beneficial to improving the steam temperature reaching capability of the boiler;
(2) The water-cooling tube bundles with large pitch are arranged in the high smoke temperature area of the back vertical shaft flue for cooling, so that the channels can be prevented from being bridged and blocked, the convection heating surface is prevented from being corroded by alkali metal, the water-cooling tube bundles do not directly affect the steam temperature of the boiler, even if pollution occurs, the steam temperature of the boiler is not affected to reach the standard, the arrangement position of the water-cooling tube bundles is the space occupied by the convection heating surface of the superheater of the conventional circulating fluidized bed boiler, the cost of the boiler is not increased additionally, and the reliability of long-term continuous operation of the boiler can be ensured.
Example 2
As further optimization of embodiment 1, as shown in fig. 1, on the basis of embodiment 1, this embodiment further includes the following technical features:
smoke side:
Most of air from the primary air blower enters the furnace bottom water-cooled air chamber 1 through an ignition air channel under a bed after being heated by the air preheater 11, then enters the furnace chamber 2 through a hood on an air distribution plate, so that the bed material is uniformly fluidized, a gas-solid two-phase flow passing upwards through the furnace chamber is formed, and the section speed of the furnace chamber is 4.5-5 m/s for ensuring enough combustion residence time. The fuel is fed into the dense phase zone at the lower part of the hearth from the feeding port arranged on the front wall, and is fully mixed with air and fluidized high-temperature bed materials for ignition combustion. After being heated by the air preheater 11, the air from the secondary air blower is sent into the hearth through secondary air ports arranged on the front wall and the rear wall of the hearth, so that enough combustion air is supplemented for fuel combustion, and a strong disturbance is generated in the furnace flow field, thereby ensuring the burnout of the fuel and reducing the generation of carbon monoxide CO.
The hearth adopts a water-cooling membrane wall structure, a screen type high-temperature superheater 3, a medium-temperature superheater 4, a low-temperature superheater 5 and a proper water-cooling heating surface are arranged in the hearth, the area of the heating surface is reasonably matched, the temperature above a secondary air port on the hearth is controlled to 870-890 ℃, the height from the upper secondary air port to the hearth outlet is not less than 20 m, and the fuel is ensured to have enough residence time and burning time.
The flue gas generated by combustion carries a large amount of solid particle materials to turn through the furnace top, enters a separator A6 and a separator B7 (the separator A6 and the separator B7 are preferably steam-cooled cyclone separators) through a flue gas outlet positioned at the upper part of a water cooling wall of a rear wall to carry out gas-solid separation, and the flue gas velocity at the inlet of the separator is 25-30 m/s and the section rising velocity of the separator is 5-7 m/s to ensure the separation efficiency. Most of the particles are separated and returned to the furnace through the return vessel. Clean flue gas containing a small amount of fly ash after separation enters a rear vertical shaft flue 8, a water cooling tube bundle 9 is adopted in a high flue gas temperature area of the rear vertical shaft flue, the transverse pitch of the tube bundle is 200mm, the flue gas temperature is reduced to below 550 ℃ through the water cooling tube bundle, and then the flue gas enters an economizer 10 and an air preheater 11 which are arranged below the water cooling tube bundle, and the flue gas temperature is reduced to about 130-150 ℃.
Steam-water side:
the boiler steam-water system comprises an economizer 10, a boiler barrel, a water cooling system, a water cooling tube bundle 9, a high-temperature superheater 3, a medium-temperature superheater 4, a low-temperature superheater 5, a separator A6, a separator B7 and connecting pipelines thereof, a back shaft flue 8 and pipelines thereof.
Boiler feed water is firstly introduced into an inlet header of the tail flue economizer, and flows upwards in countercurrent through a horizontally arranged economizer tube set 10 to enter an outlet header of the economizer, and enters the boiler barrel from a boiler barrel end socket through an economizer outlet tube. The water supply is introduced into the water space of the boiler barrel and enters the water cooling wall and the water cooling tube bundle 9 through the concentrated down pipe and the water discharging connecting pipe to enter the inlet header. The boiler water is heated into a steam-water mixture in the process of upwards flowing through the hearth water-cooling wall 2 and the water-cooling tube bundle 9, and is introduced into the boiler barrel through the steam-water outlet pipes through the respective upper outlet header boxes to carry out steam-water separation. The separated water reenters the water space of the boiler barrel and is recycled, and the separated saturated steam is led out from a steam connecting pipe at the top of the boiler barrel.
If the water-cooling tube bundle areas of the cyclone separator A6, the separator B7 and the rear vertical shaft flue 8 are in a steam cooling mode, saturated steam is led out from the boiler barrel, then is led into the cyclone separator A6 and the separator B7 inlet header through the saturated steam connecting tube, enters the cyclone separator A6 and the separator B7 outlet header after being heated by the cyclone separator, is led into the wall-covering inlet header of the water-cooling tube bundle area of the rear vertical shaft flue 8 through the connecting tube, is led into the wall-covering outlet header of the rear vertical shaft flue after being heated by the rear vertical shaft flue 8, is led into the low-temperature superheater 5, the medium-temperature superheater 4 and the high-temperature superheater 3 in sequence through the connecting tube, and finally qualified superheated steam is led out from the high-temperature superheater 3 outlet header.
If the separator A6, the separator B7 and the rear vertical shaft flue 8 are heat-insulating or steam-cooled, saturated steam is led out from the boiler barrel, then is directly led into the low-temperature superheater 5, the medium-temperature superheater 4 and the high-temperature superheater 3 in sequence by the saturated steam connecting pipe and then is led into the superheater outlet header, and finally qualified superheated steam is led out from the high-temperature superheater 3 outlet header.
The superheater system adopts flexibly-adjusted spray water temperature reduction as means for adjusting the steam temperature and protecting pipes of heating surfaces of all stages, and the whole superheater system is provided with two stages of spray water. The primary desuperheater is arranged on a pipeline from the outlet of the low-temperature superheater 5 to the inlet of the medium-temperature superheater 4 to control and adjust the outlet steam temperature of the medium-temperature superheater, and the secondary desuperheater is arranged on a connecting pipeline between the medium-temperature superheater 4 and the high-temperature superheater 3 to control and adjust the outlet steam temperature of the high-temperature superheater 3.
As described above, the present utility model can be preferably implemented.
The foregoing description of the preferred embodiment of the utility model is not intended to limit the utility model in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the utility model.
Claims (5)
1. The circulating fluidized bed boiler is characterized by comprising an air chamber (1) and a hearth (2) which are communicated with each other, and further comprising a back shaft flue (8) communicated with the hearth (2), wherein a superheater is arranged in the hearth (2);
The water cooling tube bundle (9) is arranged in the rear vertical shaft flue (8);
the device also comprises an economizer (10) arranged in the rear vertical shaft flue (8), and the economizer (10) is arranged below the water cooling tube bundle (9);
the air preheater (11) is arranged in the rear vertical shaft flue (8);
a separator is arranged in a communication pipeline between the hearth (2) and the rear vertical shaft flue (8);
The separator comprises a separator A (6) and a separator B (7), wherein the separator A (6) comprises a separator A outlet header, the separator B (7) comprises a separator B outlet header, and the separator A outlet header and the separator B outlet header are respectively communicated with a rear vertical shaft flue (8).
2. A circulating fluidized bed boiler according to claim 1, characterized in that the superheater comprises one or more of a high temperature superheater (3), a medium temperature superheater (4), a low temperature superheater (5).
3. A circulating fluidized bed boiler according to claim 1, characterized in that the water cooling tube bundle (9) is of serpentine tube construction.
4. A circulating fluidized bed boiler according to claim 1, characterized in that the separator, the water-cooled tube bundle (9) are of a steam-cooled membrane wall construction, and the economizer (10) and the air preheater (11) are of a steel plate construction.
5. A circulating fluidized bed boiler according to any of claims 1-3, characterized in that the furnace (2) is a structure surrounded by membrane walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323456137.1U CN222669976U (en) | 2023-12-18 | 2023-12-18 | A circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323456137.1U CN222669976U (en) | 2023-12-18 | 2023-12-18 | A circulating fluidized bed boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222669976U true CN222669976U (en) | 2025-03-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323456137.1U Active CN222669976U (en) | 2023-12-18 | 2023-12-18 | A circulating fluidized bed boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222669976U (en) |
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2023
- 2023-12-18 CN CN202323456137.1U patent/CN222669976U/en active Active
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