CN109185869B - Fluidized boiler with layered combustion chamber - Google Patents
Fluidized boiler with layered combustion chamber Download PDFInfo
- Publication number
- CN109185869B CN109185869B CN201811030545.1A CN201811030545A CN109185869B CN 109185869 B CN109185869 B CN 109185869B CN 201811030545 A CN201811030545 A CN 201811030545A CN 109185869 B CN109185869 B CN 109185869B
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- China
- Prior art keywords
- ash
- combustion chamber
- chamber
- overheating
- filter screen
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—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
- F23C10/12—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 exclusively within the combustion zone
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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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
The invention relates to a fluidized boiler with layered combustion chambers, which comprises a boiler body, wherein the boiler body is respectively provided with an ash discharge chamber and a combustion chamber; the combustion chamber is divided into an ignition chamber, a low-temperature combustion chamber and a overheating combustion chamber, wherein a feed inlet is formed in the side wall of the ignition chamber, a coal powder primary filter screen is arranged at the bottom of the ignition chamber and used for being connected with an ash discharge chamber, an ash return cylinder is arranged in the middle of the combustion chamber, the bottom of the ash return cylinder penetrates through the coal powder primary filter screen and is communicated with the ash discharge chamber, the top of the ash return cylinder is connected to the bottom of the overheating combustion chamber, and a circulating ash discharge port is formed in the top of the overheating combustion chamber; cooling pipes are arranged on the inner wall of the low-temperature combustion chamber and the outer wall surface of the ash return cylinder in an array mode, overheating pipes are arranged in the overheating combustion chamber in a stacking array mode, and the cooling pipes are connected with the overheating pipes through steam drums; the ash discharging chamber is provided with a coal ash separating filter screen and a sundries separating screen, wherein the bottom of the ash discharging chamber is connected with a circulating air inlet pipe, an ash discharging pipe is fixed in the middle of the sundries separating screen, and the opening of the ash discharging pipe faces the coal ash separating filter screen.
Description
Technical Field
The invention relates to an environment-friendly energy-saving boiler, belonging to a fluidized boiler with layered combustion chambers.
Background
With the increasing requirement on environmental protection in China and the increasing requirement on the heat conversion efficiency of boilers, the large fluidized boilers with tail overheating pipelines can be purchased mainly, the fluidized boilers are high in coal consumption and high in manufacturing cost, are only suitable for being used in the fields of large power plants, large-scale factories and the like, and are high in cost for small enterprises, and the heat conversion efficiency of the traditional horizontal coal briquette boiler cannot meet the requirement, so that a boiler with high combustion efficiency and small size is urgently needed to meet the upgrading requirement of the small enterprises.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the fluidized boiler with the layered combustion chamber overcomes the technical problem that the fluidized boiler in the prior art is high in manufacturing cost and price, and is of a circulating structure.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a fluidized boiler with layered combustion chambers comprises a boiler body, wherein the boiler body is respectively provided with an ash discharge chamber and a combustion chamber from bottom to top; the combustor is divided into a pilot combustor, a low-temperature combustor and a overheating combustor from bottom to top, wherein a feed inlet is formed in the side wall of the pilot combustor, a coal powder primary filter screen is arranged at the bottom of the pilot combustor and used for being connected with an ash discharge chamber, an ash return cylinder is arranged in the middle of the combustor, the bottom of the ash return cylinder penetrates through the coal powder primary filter screen and is communicated with the ash discharge chamber, the top of the ash return cylinder is connected to the bottom of the overheating combustor, and a circulating ash discharge port is formed in the top of the overheating combustor; cooling pipes are arranged on the inner wall of the low-temperature combustion chamber and the outer wall surface of the ash return cylinder in an array mode, a plurality of superheater pipes of coil pipe structures are arranged in the superheated combustion chamber in a stacked array mode, and the cooling pipes are connected with the superheater pipes through steam drums; the ash discharging chamber is sequentially provided with a coal ash separation filter screen and a sundries separation screen from top to bottom, wherein the bottom of the ash discharging chamber is connected with a circulating air inlet pipe, an ash discharging pipe is fixed in the middle of the sundries separation screen, and the opening of the ash discharging pipe faces the coal ash separation filter screen; the circulating ash discharge port is connected to the circulating air inlet pipe through a circulating fan, the driving direction of the circulating fan faces the circulating air inlet pipe, and the bottom of the ash discharge chamber is also vertically connected with an impurity discharge pipe.
As a further improvement of the invention, the cooling pipe positioned on the outer wall of the ash returning cylinder is spirally arranged from bottom to top.
As a further improvement of the invention, the cooling pipe positioned on the outer wall surface of the ash returning cylinder is in heat conduction connection with the inner wall of the ash returning cylinder.
As a further improvement of the invention, the inner wall of the low-temperature combustion chamber is of a concave structure with a semicircular section, and the cooling pipe on the inner wall of the low-temperature combustion chamber is spirally arranged from bottom to top along the low-temperature combustion chamber.
As a further improvement of the invention, the ash returning barrel is of a tapered structure, one end of the ash returning barrel, facing the overheating combustion chamber, is of a flaring structure, and one end of the ash returning barrel, facing the ash discharging chamber, is of a necking structure.
As a further improvement of the invention, the bottom of the ash discharge chamber is of a tapered structure.
As a further improvement of the invention, the top of the superheating combustion chamber is of a tapered structure.
As a further improvement of the invention, the impurity discharging pipe is vertically connected to the bottom of the ash discharging chamber, and the circulating air inlet pipe is connected to the side wall of the impurity discharging pipe.
As a further improvement of the invention, an ash cleaning port is arranged on the wall surface of the ash discharging chamber between the coal powder primary filter screen and the coal ash separation filter screen.
The invention has the beneficial effects that:
1. the invention realizes the reciprocating circular combustion of the fly ash and the unburned coal powder through a dust return cylinder by micro-contracting the traditional fluidized circulating boiler and using a circulating fan as a driving force, in addition, the dust return cylinder can realize the secondary use of the heat of the fly ash and the unburned coal powder, the fly ash with high heat and the unburned coal powder can also realize the preheating of the air entering a bottom dust exhaust chamber, the preheating, ignition, overheating combustion and circular heating of the coal powder are realized by using smaller boiler volume, and the problem of lower combustion of the traditional boiler is solved.
2. Compared with a vertically arranged structure, the cooling pipe in the spiral arrangement has longer flow path and longer heating time, can obtain steam with higher temperature, and is suitable for the use condition that a small boiler has high heat demand but low flow demand.
3. The outer wall of the ash returning cylinder is in heat conduction connection with the cooling pipe, so that the heating efficiency of the ash returning cylinder and the cooling pipe can be further improved.
4. The inner wall of the concave low-temperature combustion chamber has larger combustion volume and larger water cooling wall area, and the heating efficiency of unit space to the cooling pipe can be improved.
5. The ash return barrel of the reducing structure can be favorable for increasing the volume of the low-temperature combustion chamber, so that pulverized coal in the low-temperature combustion chamber has a larger ignition space, the top of the ash return barrel can realize the contraction of the top space of the low-temperature combustion chamber, the bottom of the over-heating combustion chamber has a larger air flow entering rate, flame of the over-heating combustion chamber can have a higher rate and can penetrate through multiple layers of over-heating pipes, and the heating efficiency of the over-heating pipes is ensured.
6. The impurity discharging pipe is vertically arranged, so that the agglomerated coal ash can be conveniently discharged from the bottom of the ash discharging chamber.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic cross-sectional view of the present invention;
fig. 2 is a schematic diagram of a steam drum configuration.
In the figure: 1. a pilot chamber; 2. a low temperature combustion chamber; 3. a superheating combustion chamber; 4. an ash discharge chamber; 5. a coal dust primary filter screen; 6. a coal ash separation filter screen; 7. a sundry separation net; 8. a feed inlet; 9. an ash discharge pipe; 10. a trash removal pipe; 11. a circulating air inlet pipe; 12. the inner wall of the low-temperature combustion chamber; 13. a cooling tube; 14. a superheater tube; 15. a circulating ash discharge port; 16. returning ash to the ash cylinder; 17. and (5) cleaning ash.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1 and 2, the invention relates to a fluidized boiler with layered combustion chambers, which comprises a boiler body, wherein the boiler body is provided with an ash discharge chamber and a combustion chamber from bottom to top; the combustor is divided into a pilot combustor, a low-temperature combustor and a superheat combustor from bottom to top, wherein a feed inlet is formed in the side wall of the pilot combustor, a coal powder primary filter screen is arranged at the bottom of the pilot combustor and used for being connected with an ash discharge chamber, a circulating ash discharge port is formed in the top of the superheat combustor, and the top of the superheat combustor and the bottom of the ash discharge chamber are of tapered structures;
the middle part of the combustion chamber is provided with an ash returning cylinder, the bottom of the ash returning cylinder penetrates through a coal powder primary filter screen and is communicated with the ash discharge chamber, the top of the ash returning cylinder is connected to the bottom of the overheating combustion chamber, the ash returning cylinder is of a reducing structure, one end of the ash returning cylinder, facing the overheating combustion chamber, is of an expanding structure, and one end of the ash returning cylinder, facing the ash discharge chamber, is of a reducing structure;
the array is provided with the cooling tube on the outer wall of low temperature combustion chamber inner wall and ash return barrel, the inner wall of low temperature combustion chamber is semicircular indent structure for the cross-section, the cooling tube that is located ash return barrel outer wall and the cooling tube that is located ash return barrel outer wall are the spiral arrangement from bottom to top range upon range of array is provided with the superheater tube of a plurality of coil structures in the overheated combustion chamber, is connected through the steam pocket between cooling tube and the superheater tube, and the connected mode of steam pocket does: the steam pocket is divided into a cold water area and a hot water area, the cold water area is connected with the hot water area through a partition plate, the bottom of the cold water area at the bottom of the steam pocket is connected to the bottom of the cooling pipe through a water pump, the top of the cooling pipe is connected to a low-temperature warm water inlet positioned in the middle of the steam pocket, the hot water area at the top of the steam pocket is connected to the bottom of the superheater pipe array through a water pump, the top of the superheater pipe is connected to steam using equipment, and after the steam using equipment is used, the steam using equipment is connected to a hot water;
the dust exhaust chamber is provided with a coal ash separation filter screen and a sundries separation screen from top to bottom in sequence, wherein the bottom of the dust exhaust chamber is vertically connected with a sundries exhaust pipe, the side wall of the sundries exhaust pipe is connected with a circulating air inlet pipe, the middle part of the sundries separation screen is fixed with a dust exhaust pipe, and the opening of the dust exhaust pipe faces the coal ash separation filter screen; the circulating ash discharge port is connected to the circulating air inlet pipe through a circulating fan, and the driving direction of the circulating fan faces to the circulating air inlet pipe.
During combustion, pulverized coal is blown in from a feeding hole through an air blower, then the pulverized coal is combusted in a pilot chamber, air is blown in from a circulating air inlet pipe at the bottom of an ash discharging chamber, then the pulverized coal is driven by a fan to enter a low-temperature combustion chamber for full combustion, a cooling pipe is heated, cold water in the cooling pipe is heated and rises to enter a warm water area of bubbles, then the top of pulverized coal flame is blown into an overheating combustion chamber at a certain high speed through a necking gap between the top of an ash returning cylinder and the inner wall of the low-temperature combustion chamber, so that a mixed fluid of water vapor and water vapor in an overheating pipe in the overheating combustion chamber is heated to a critical state, simultaneously generated oxidizing gas and part of light coal ash are discharged through a circulating ash discharging port at the top, the discharged high-temperature oxidizing gas is filtered and blown into the circulating air inlet pipe through the fan to preheat air and pulverized coal in the pilot chamber, and unburned pulverized coal fall into the ash returning cylinder again, thereby a secondary heating returns grey section of thick bamboo, realize the thermal reutilization of high temperature buggy and fly ash, buggy and bold fly ash are under the burning of ignition chamber flame at the position of coal ash separation filter screen, carry out the postcombustion, its heat passes buggy primary filter screen and enters into low temperature combustion chamber, buggy and the bold buggy that is heated the decomposition pass coal ash separation filter screen simultaneously and pass through the ash discharge pipe discharge, in order to prevent that the buggy of heating cooling caking from entering into the jam that the circulation air-supply line leads to buggy separation filter screen, the buggy of caking can be discharged through the row's of vertical setting miscellaneous pipe, and the caking coal ash that can't burn the decomposition completely then can be discharged through the ash discharge chamber wall that sets up between primary filter screen and coal ash separation filter screen.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A fluidized boiler with layered combustion chambers is characterized in that: comprises a furnace body, wherein the furnace body is respectively provided with an ash discharge chamber and a combustion chamber from bottom to top; the combustor is divided into a pilot combustor, a low-temperature combustor and a overheating combustor from bottom to top, wherein a feed inlet is formed in the side wall of the pilot combustor, a coal powder primary filter screen is arranged at the bottom of the pilot combustor and used for being connected with an ash discharge chamber, an ash return cylinder is arranged in the middle of the combustor, the bottom of the ash return cylinder penetrates through the coal powder primary filter screen and is communicated with the ash discharge chamber, the top of the ash return cylinder is connected to the bottom of the overheating combustor, and a circulating ash discharge port is formed in the top of the overheating combustor; cooling pipes are arranged on the inner wall of the low-temperature combustion chamber and the outer wall surface of the ash return cylinder in an array mode, a plurality of superheater pipes of coil pipe structures are arranged in the superheated combustion chamber in a stacked array mode, and the cooling pipes are connected with the superheater pipes through steam drums; the ash discharging chamber is sequentially provided with a coal ash separation filter screen and a sundries separation screen from top to bottom, wherein the bottom of the ash discharging chamber is connected with a circulating air inlet pipe, an ash discharging pipe is fixed in the middle of the sundries separation screen, and the opening of the ash discharging pipe faces the coal ash separation filter screen; the circulating ash discharge port is connected to the circulating air inlet pipe through a circulating fan, the driving direction of the circulating fan faces the circulating air inlet pipe, and the bottom of the ash discharge chamber is also vertically connected with an impurity discharge pipe.
2. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: the cooling pipes positioned on the outer wall of the ash returning cylinder are spirally arranged from bottom to top.
3. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: the cooling pipe positioned on the outer wall surface of the ash returning cylinder is in heat conduction connection with the inner wall of the ash returning cylinder.
4. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: the inner wall of the low-temperature combustion chamber is of a concave structure with a semicircular cross section, and cooling pipes on the inner wall of the low-temperature combustion chamber are spirally arranged from bottom to top along the low-temperature combustion chamber.
5. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: the ash returning cylinder is of a gradually reducing structure, one end of the ash returning cylinder, facing the overheating combustion chamber, is of an expanding structure, and one end of the ash returning cylinder, facing the ash discharge chamber, is of a reducing structure.
6. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: wherein the bottom of the ash discharge chamber is of a tapered structure.
7. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: the top of the overheating combustion chamber is of a tapered structure.
8. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: the trash-discharging pipe is vertically connected to the bottom of the trash-discharging chamber, and the circulating air inlet pipe is connected to the side wall of the trash-discharging pipe.
9. The layered combustion chamber fluidizing boiler according to claim 1, characterized in that: an ash cleaning opening is arranged on the wall surface of the ash discharging chamber between the coal powder primary filter screen and the coal ash separation filter screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811030545.1A CN109185869B (en) | 2018-09-05 | 2018-09-05 | Fluidized boiler with layered combustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811030545.1A CN109185869B (en) | 2018-09-05 | 2018-09-05 | Fluidized boiler with layered combustion chamber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109185869A CN109185869A (en) | 2019-01-11 |
| CN109185869B true CN109185869B (en) | 2019-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811030545.1A Active CN109185869B (en) | 2018-09-05 | 2018-09-05 | Fluidized boiler with layered combustion chamber |
Country Status (1)
| Country | Link |
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| CN (1) | CN109185869B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2116745C (en) * | 1993-03-03 | 2007-05-15 | Shuichi Nagato | Pressurized internal circulating fluidized-bed boiler |
| JPH09166303A (en) * | 1995-12-14 | 1997-06-24 | Ishikawajima Harima Heavy Ind Co Ltd | Scattered ash treatment device of pressurized fluidized bed boiler |
| CN1239841C (en) * | 1998-02-27 | 2006-02-01 | 株式会社荏原制作所 | Fluidized bed gasification furnace |
| CN1125948C (en) * | 2001-02-28 | 2003-10-29 | 清华大学 | Combustion apparatus with cross-section variable circulating fluidized bed |
| CN203628637U (en) * | 2013-10-29 | 2014-06-04 | 大连环资科技有限公司 | Thermosetting carrier circulating fluidized bed furnace taking coke wastes as fuel |
| CN108224766A (en) * | 2017-12-21 | 2018-06-29 | 陈方羽 | A kind of power economized boiler using fuel gas second-time burning heating cold air |
-
2018
- 2018-09-05 CN CN201811030545.1A patent/CN109185869B/en active Active
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| CN109185869A (en) | 2019-01-11 |
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Effective date of registration: 20191129 Address after: 331800 reclaimed Bay Industrial Park, Dongxiang County Economic Development Zone, Fuzhou, Jiangxi Applicant after: Jiangxi Huanglong grease Co., Ltd. Address before: 211100 6 Jin Ying Road, Hu Shu street, Jiangning District, Nanjing, Jiangsu Applicant before: Xu Chenhua |