CN109458614B - Reforming device for biomass combustion of circulating fluidized bed coal-fired boiler - Google Patents
Reforming device for biomass combustion of circulating fluidized bed coal-fired boiler Download PDFInfo
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- CN109458614B CN109458614B CN201811107085.8A CN201811107085A CN109458614B CN 109458614 B CN109458614 B CN 109458614B CN 201811107085 A CN201811107085 A CN 201811107085A CN 109458614 B CN109458614 B CN 109458614B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
Abstract
The invention discloses a device for reforming biomass combustion of a circulating fluidized bed coal-fired boiler, which comprises a hearth, wherein the lower end and the side end of the hearth are respectively provided with a cooler and a material returning system optimization device, the lower end of the material returning system optimization device is provided with an air blower, the side end of the material returning system optimization device is communicated with a filter, an economizer and an air preheater, the air preheater is communicated with a dust remover, the dust remover is communicated with a chimney through an induced draft fan, the side end of the hearth is provided with a feeding system, the feeding system comprises a feeding hole, an air lock is arranged in the feeding hole, and the feeding system is communicated with a material conveying system; the invention improves the material conveying system and the material feeding system, so that the biomass conveying vehicle has surplus, the boiler load is improved, the further collection of the biomass combustion fly ash is realized, and meanwhile, the fly ash recycling pipe is additionally arranged by connecting the ash bucket of the dust remover in the boiler, so that the returned ash amount of the hearth in the boiler system is effectively improved; by adding the low-pressure economizer, the exhaust gas temperature is reduced, and the efficiency is improved.
Description
Technical Field
The invention belongs to the field of boiler modification devices, and particularly relates to a modification device for biomass combustion of a coal-fired boiler of a circulating fluidized bed.
Background
The coal-fired boiler is modified and the biomass blending combustion proportion is increased, and in the process of modifying and combusting biomass, due to more differences of the biomass and the coal-fired property, a plurality of running problems occur.
The most intuitive problem of the coal-fired boiler is that the capacity of a material conveying system and a material feeding system is insufficient or the existing material conveying system and the existing material changing system cannot bring the design load of the steam production of the boiler, thereby influencing the stability.
In the control of the bed temperature of the circulating fluidized bed, the control of the amount of the returned ash is the most effective measure, but the content of the ash of biomass is lower than that of the coal, and the amount of the returned ash cannot meet the operation requirement. Especially, in the initial stage of blowing in, if the returning charge device is overhauled and cleaned during blowing out, a very long process is needed for establishing a normal returning charge ash level, compared with coal burning, the biomass has low ash content, is thin and light, is difficult to capture by a cyclone separator, and even a normal biomass boiler also has the problem of insufficient returning charge.
At this time, the temperature in the furnace is higher due to less return ash, and the oxygen content is higher due to the requirement of the lowest fluidization air quantity, NOXIs a very difficult matter. Even with SNCR equipment, denitration efficiency is extremely low and even ineffective for high-temperature oxygen-enriched environment! Unlike coal-fired boilers, biomass boilers are at dilute phase temperatureThe degree control must also be very tight. Because the biomass ash melting point is greatly lower than that of coal-fired ash due to the fact that the biomass ash melting point is rich in potassium ions, a large amount of ash in a molten state is accumulated on an evaporation tube bundle or a superheater screen in a furnace after the temperature of a dilute phase region is high, a flue gas channel is blocked, the flow rate of flue gas is accelerated, so that pipe explosion caused by abrasion is aggravated, and accumulated overlarge ash blocks sometimes fall into a bed layer to influence fluidization to cause coking.
The tail part of the coal-fired boiler has high smoke quantity and high smoke discharging temperature due to the fact that the biomass contains much moisture.
Disclosure of Invention
The invention aims to solve the problems, the biomass transportation vehicle has surplus through the improvement of the material conveying system and the material feeding system, the boiler load is improved, the further collection of biomass combustion fly ash is realized, and meanwhile, the fly ash recycling pipe is additionally arranged by connecting the ash hopper of the dust remover in the boiler, so that the returned ash amount of a hearth in the boiler system is effectively improved; by adding the low-pressure economizer, the exhaust gas temperature is reduced, and the efficiency is improved.
In order to realize the purpose, the invention adopts the technical scheme that: the device comprises a hearth, wherein a cooler and a material returning system optimization device are respectively arranged at the lower end and the side end of the hearth, an air blower is arranged at the lower end of the material returning system optimization device, the side end of the material returning system optimization device is communicated with a filter, a first economizer and an air preheater, the air preheater is communicated with a dust remover, the dust remover is communicated with a chimney through an induced draft fan, a feeding system is arranged at the side end of the hearth, the feeding system comprises a boiler feeding hole, a gas locking device is arranged in the boiler feeding hole, and the feeding system is communicated with a material conveying system; the material returning system optimizing device comprises a cyclone separator body, wherein a feeding hole is formed in one side of the upper part of the cyclone separator body, and an air outlet is formed in the upper end of the cyclone separator body; a blanking port is formed in the bottom of the cyclone separator body, a water tank is arranged at the top of the cyclone separator body, and a guide pipe is arranged at the bottom of the water tank; a rotary induction switch is arranged in the flow guide pipe; a plurality of water seepage ports are uniformly arranged on the two sides of the bottom of the flow guide pipe from top to bottom at intervals; a water-absorbing ash-collecting plate is arranged on the water seepage port at the bottom of the flow guide pipe, clamping plates are arranged on two sides of the water-absorbing ash-collecting plate, and the clamping plates are fixedly arranged on the flow guide pipe; a return hopper is arranged at the bottom of the blanking port, and one side of the return hopper is connected with a fly ash recirculation pipe; the fly ash recirculation pipe is communicated with an ash hopper at the lower end of the dust remover, and the side end of the return hopper is communicated with the hearth through a connecting pipe; and a second coal economizer group is arranged between the air preheater and the dust remover. The pouring part of the water-cooled wall of the hearth is damaged by 3m from top to bottom, a belt is added or the speed is increased by a material conveying system, and the diameter of a feeding hole is set to be 800 mm.
Furthermore, the middle section of the cyclone separator body is a cylinder wall, and one side of the cylinder wall is provided with an observation window; and a radiating fin device is arranged on the outer side of the bottom of the cylinder wall.
Furthermore, the water absorption and dust collection plates are divided into two layers, and the water seepage port is arranged between the two layers of water absorption and dust collection plates; the water absorption and dust collection plate is a foam asbestos plate.
Furthermore, the rotary inductive switch is a speed-driven inductive switch which realizes the on-off of the flow guide pipe through the rotating speed.
Further, the second economizer group is set as a low-pressure economizer.
Furthermore, the second coal economizer group is provided with three groups which are respectively communicated with the primary fan, the secondary fan and the tertiary fan.
The invention has the beneficial effects that:
1. according to the invention, through the improvement of the material conveying system and the material feeding system, the speed of the material conveying system is increased, the feed opening of the material feeding system is enlarged, and meanwhile, the gas locking device is installed, so that the biomass conveying vehicle has more surplus, and the boiler load is improved.
2. In the invention, the ash conveying pipe at the lower end of the ash hopper of the dust remover is connected with the fly ash recirculation pipe to the return port of the hearth, so that the carbon content of fly ash can be reduced, the effect of improving the amount of return ash is good, and the problem of insufficient return ash is solved.
3. When the material returning system optimizing device works, the water-absorbing ash-collecting plate is driven to rotate by the upward swirling air flow in the center of the cyclone separator, and the rotary inductive switch is triggered to open the water tank; water flow soaks the water absorption ash collecting plate through the water seepage port through the honeycomb duct, and soaks water absorption ash collecting plate surface with moisture through the centrifugal force that rotatory production, hits the contact face when the air current is rotatory in the sluicing, thin and light burning ash is cohered and is gathered into a group by moisture, throws off at last and falls to the section of thick bamboo wall and slide down blanking mouth department on, thereby realizes going up the cyclone in cyclone body center and carries out living beings burning ash and collect again.
4. The observation window and the radiating fin device arranged in the material returning system optimizing device can realize the control and adjustment of the working parameters of the device by observing the effect of the internal water absorption and dust collection plate; meanwhile, in order to avoid that the ash-removing air is too dry and hot and the collected biomass ash is scattered again when passing through the lower end of the cylinder wall and is brought into the air by the air flow, the radiating fin device is arranged at the lower part of the cylinder wall, so that ash-burning particles can smoothly reach the blanking port and enter the return hopper.
5. The water absorption and dust collection plate device in the material returning system optimization device is a foam asbestos plate which meets the conditions of heat resistance and light weight and has certain tensile strength and water absorption; thereby fully adapting to the functions of rotating in the cyclone separator and absorbing water and collecting ash.
6. According to the invention, the pouring part of the water-cooled wall of the hearth is broken, so that the phenomenon that the evaporating tube can melt and deposit dust on the tube panel of the superheater is improved.
7. According to the invention, the second coal economizer group is added, so that the exhaust gas temperature is reduced, the efficiency is improved, and the operation environment of the dust remover is also improved.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
Fig. 2 is a schematic structural diagram of the material returning system optimizing device in the invention.
Fig. 3 is a schematic cross-sectional view of the structure on the flow guide pipe of the material returning system optimizing device in the invention.
In the figure: 1. a hearth; 2. A delivery system; 3. A boiler feed inlet; 4. An air lock; 5. A cooler; 6. A material returning system optimizing device; 7. A filter; 8. A first economizer; 9. An air preheater; 10. A second economizer group; 11. A dust remover; 12. a chimney; 13. An induced draft fan; 14. A third fan; 15. A secondary air fan; 16. A primary air fan; 17. A blower; 18. A connecting pipe; 601. a feed inlet; 602. a cyclone body; 603. an air outlet; 604. a blanking port; 605. a water tank; 606. a flow guide pipe; 607. rotating the inductive switch; 608. a cylinder wall; 609. an observation window; 610. a water seepage port; 611. a splint; 612. a water-absorbing dust-collecting plate; 613. returning the hopper; 614. a heat sink device; 615. a fly ash recirculation pipe; 1101. an ash hopper; 100. A feed system.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
As shown in fig. 1 to 3, the specific structure of the present invention is:
a reforming device for biomass combustion of a circulating fluidized bed coal-fired boiler comprises a hearth 1, wherein a cooler 5 and a material returning system optimizing device 6 are respectively arranged at the lower end and the side end of the hearth 1, an air blower 17 is arranged at the lower end of the material returning system optimizing device 6, the side end of the material returning system optimizing device 6 is communicated with a filter 7, a first economizer 8 and an air preheater 9, the air preheater 9 is communicated with a dust remover 11, the dust remover 11 is communicated with a chimney 12 through an induced draft fan 13, a feeding system 100 is arranged at the side end of the hearth 1, the feeding system 100 comprises a boiler feeding hole 3, an air locker 4 is arranged in the boiler feeding hole 3, and the feeding system 100 is communicated with a material conveying system 2; the material returning system optimizing device 6 comprises a cyclone separator body 602, wherein a feeding hole 601 is formed in one side of the upper part of the cyclone separator body 602, and an air outlet 603 is formed in the upper end of the cyclone separator body; a blanking port 604 is arranged at the bottom of the cyclone separator body 602, a water tank 605 is arranged at the top of the cyclone separator body 602, and a guide pipe 606 is arranged at the bottom of the water tank 605; a rotary induction switch 607 is arranged in the flow guide pipe 606; a plurality of water seepage ports 610 are uniformly arranged on the two sides of the bottom of the flow guide pipe 606 at intervals from top to bottom; a water-absorbing ash-collecting plate 612 is arranged on the water seepage port 610 at the bottom of the draft tube 606, clamping plates 611 are arranged on two sides of the water-absorbing ash-collecting plate 612, and the clamping plates 611 are fixedly arranged on the draft tube 606; a return hopper 613 is arranged at the bottom of the blanking port 604, and a fly ash recirculation pipe 615 is connected to one side of the return hopper 613; the fly ash recycling pipe 615 is communicated with an ash hopper 1101 at the lower end of the dust remover 11, and the side end of the return hopper 613 is communicated with the furnace 1 through a connecting pipe 18; a second economizer group 10 is arranged between the air preheater 9 and the dust remover 11. The belt is added or the speed is increased in the material conveying system 2, the diameter of the feeding hole 601 is set to be 800mm, the diameter can be expanded, and meanwhile, the air lock 4 is installed, so that the biomass conveying vehicle has more room, and the load of the boiler is increased. The pouring part of the water wall of the hearth 1 is damaged by 3m from top to bottom, so that the phenomenon that the evaporating tube can melt and deposit ash on the tube panel of the superheater is improved.
In order to further facilitate the control of the working process of the device and improve the fly ash collection efficiency, the middle section of the cyclone body 602 is a cylinder wall 608, and one side of the cylinder wall 608 is provided with an observation window 609; the outer side of the bottom of the cylinder wall 608 is provided with a heat sink 614.
In order to improve the fly ash collection efficiency and meet the requirements of the working environment, the water absorption and dust collection plate 612 is divided into two layers, and the water seepage port 610 is arranged between the two layers of water absorption and dust collection plates 612; the water and dust collecting plate 612 is a foam asbestos plate.
In order to realize the automatic on-off function of the flow guide pipe 606, the rotary inductive switch 607 is a speed-driven inductive switch for realizing the on-off of the flow guide pipe 606 through the rotating speed.
In order to reduce the exhaust gas temperature, improve the efficiency and improve the operation environment of the dust remover, the second economizer group 10 is set as a low-pressure economizer, and the second economizer group 10 is set as three groups which are respectively communicated with the primary fan 16, the secondary fan 15 and the tertiary fan 14.
When the device for the optimization device of the material returning system works, the water-absorbing ash-collecting plate is driven to rotate by the upward swirling airflow in the center of the cyclone separator, and the rotary inductive switch is triggered to open the water tank; water flow passes through the honeycomb duct and soaks the water absorption ash collecting plate through the infiltration port, and the centrifugal force through rotatory production soaks water absorption ash collecting plate surface with moisture, hits the contact face when the air current is rotatory in the pushing plate, and thin and light burning ash is cohered and is gathered into a group by moisture, throws off at last and falls to the section of thick bamboo wall and slide on and fall to blanking mouth department.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (5)
1. A reforming device for biomass combustion of a circulating fluidized bed coal-fired boiler comprises a hearth (1), wherein a cooler (5) and a material returning system optimizing device (6) are respectively arranged at the lower end and the side end of the hearth (1), an air blower (17) is arranged at the lower end of the material returning system optimizing device (6), the side end of the material returning system optimizing device (6) is communicated with a filter (7), a first economizer (8) and an air preheater (9), the air preheater (9) is communicated with a dust remover (11), the dust remover (11) is communicated with a chimney (12) through an induced draft fan (13), and the reforming device is characterized in that a feeding system (100) is arranged at the side end of the hearth (1), the feeding system (100) comprises a boiler feeding port (3), a gas locker (4) is arranged in the boiler feeding port (3), and the feeding system (100) is communicated with a material conveying system (2); the material returning system optimizing device (6) comprises a cyclone separator body (602), a feeding hole (601) is formed in one side of the upper portion of the cyclone separator body (602), and an air outlet (603) is formed in the upper end of the cyclone separator body; a blanking port (604) is formed in the bottom of the cyclone separator body (602), a water tank (605) is arranged at the top of the cyclone separator body (602), and a guide pipe (606) is arranged at the bottom of the water tank (605); a rotary induction switch (607) is arranged in the flow guide pipe (606); a plurality of water seepage ports (610) are uniformly arranged on the two sides of the bottom of the flow guide pipe (606) from top to bottom at intervals; a water-absorbing ash-collecting plate (612) is arranged on the water seepage port (610) at the bottom of the draft tube (606), clamping plates (611) are arranged on two sides of the water-absorbing ash-collecting plate (612), and the clamping plates (611) are fixedly arranged on the draft tube (606); a return hopper (613) is arranged at the bottom of the blanking port (604), and one side of the return hopper (613) is connected with a fly ash recycling pipe (615); the fly ash recycling pipe (615) is communicated with an ash hopper (1101) at the lower end of the dust remover (11), and the side end of the return hopper (613) is communicated with the furnace (1) through a connecting pipe (18); a second economizer group (10) is arranged between the air preheater (9) and the dust remover (11).
2. The biomass-fired reforming device of a circulating fluidized bed coal-fired boiler according to claim 1, characterized in that the middle section of the cyclone body (602) is a cylinder wall (608), and one side of the cylinder wall (608) is provided with an observation window (609); and a cooling fin device (614) is arranged on the outer side of the bottom of the cylinder wall (608).
3. The device for reforming the biomass combustion of the circulating fluidized bed coal-fired boiler according to claim 1, wherein the water absorption and ash collection plate (612) is two layers, and the water seepage port (610) is arranged between the two layers of the water absorption and ash collection plates (612); the water absorption and dust collection plate (612) is a foam asbestos plate.
4. The biomass-fired reforming device of a circulating fluidized bed coal-fired boiler according to claim 1, characterized in that the rotary induction switch (607) is a speed-driven induction switch for switching the flow guide pipe (606) through the rotating speed.
5. The reforming apparatus for biomass combustion in a circulating fluidized bed coal-fired boiler according to claim 1, wherein the second economizer group (10) is provided as a low-pressure economizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811107085.8A CN109458614B (en) | 2018-09-21 | 2018-09-21 | Reforming device for biomass combustion of circulating fluidized bed coal-fired boiler |
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| CN201811107085.8A CN109458614B (en) | 2018-09-21 | 2018-09-21 | Reforming device for biomass combustion of circulating fluidized bed coal-fired boiler |
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| CN109458614A CN109458614A (en) | 2019-03-12 |
| CN109458614B true CN109458614B (en) | 2020-01-21 |
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| CN112325282A (en) * | 2020-10-29 | 2021-02-05 | 中国石油化工集团有限公司 | Circulating fluidized bed flue gas and fly ash combined circulating system and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102537975B (en) * | 2012-03-15 | 2013-12-25 | 哈尔滨工业大学 | Circulating fluidized bed garbage incineration boiler and pollution control system with same |
| JP6258102B2 (en) * | 2014-03-31 | 2018-01-10 | 住友重機械工業株式会社 | Fluidized bed combustion facility and method of supplying fluidized medium to fluidized bed combustion furnace |
| CN204629528U (en) * | 2015-03-17 | 2015-09-09 | 安徽金鼎锅炉股份有限公司 | A kind of burning boiler material circulating system |
| DE102015107015A1 (en) * | 2015-05-05 | 2016-11-10 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Exhaust gas treatment device for exhaust gas of a small combustion plant and method for the treatment of exhaust gas of a small combustion plant |
| CN204693402U (en) * | 2015-05-07 | 2015-10-07 | 北京热华能源科技有限公司 | A kind of return material transporting device being applied to burning smoke stalk boiler |
| CN207179642U (en) * | 2017-07-05 | 2018-04-03 | 福建省圣新能源股份有限公司 | A kind of modified form biomass boiler Cyclonic separating apparatus |
| CN107191925A (en) * | 2017-07-21 | 2017-09-22 | 大同煤炭职业技术学院 | A kind of CFBB and its abnormal method of adjustment of returning charge |
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