CN106931467B - Graded air supply and flue gas recirculation system of return air furnace - Google Patents
Graded air supply and flue gas recirculation system of return air furnace Download PDFInfo
- Publication number
- CN106931467B CN106931467B CN201710226630.4A CN201710226630A CN106931467B CN 106931467 B CN106931467 B CN 106931467B CN 201710226630 A CN201710226630 A CN 201710226630A CN 106931467 B CN106931467 B CN 106931467B
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- China
- Prior art keywords
- furnace
- air inlet
- flue gas
- gas recirculation
- recirculation system
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- F24B5/00—Combustion-air or flue-gas circulation in or around stoves or ranges
- F24B5/02—Combustion-air or flue-gas circulation in or around stoves or ranges in or around stoves
- F24B5/028—Arrangements combining combustion-air and flue-gas circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
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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
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- 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
Abstract
The invention discloses a grading air supply and flue gas recirculation system of a return air furnace, which comprises a furnace body and a furnace core arranged in the furnace body, wherein gaps are kept between the furnace core and the furnace body and the gaps are uniformly separated into four secondary air inlet pipes with sealed upper ends and four air inlet circulation pipes with open upper ends through partition boards; the invention promotes the complete combustion of the biological fuel, has higher fuel combustion utilization rate and combustion efficiency, is suitable for combusting biomass fuel with higher density, and secondarily combusts combustible gas and unburnt fuel particles in the recirculated flue gas again, thereby further thoroughly combusting the fuel and reducing environmental pollution.
Description
Technical Field
The invention belongs to the technical field of return air furnaces, and particularly relates to a hierarchical air supply and flue gas recirculation system of a return air furnace.
Background
The currently accepted return air furnace for combusting biomass fuel only has a single-layer combustion net, adopts primary air intake at the bottom, and has incomplete fuel combustion, large fuel waste and low combustion efficiency.
Disclosure of Invention
The invention aims to solve the technical problems that: the utility model provides a hierarchical air supply and flue gas recirculation system of return air stove, the burning is more abundant, and fuel utilization is high, and combustion efficiency is higher, is suitable for burning the great biomass fuel of density to solve the problem that exists among the above-mentioned prior art.
The technical scheme adopted by the invention is as follows: the utility model provides a hierarchical air supply and flue gas recirculation system of return air stove, including the furnace body and install the stove core in the furnace body, keep the clearance and keep apart into four secondary air-supply pipes and four air inlet circulating pipes of upper end open-ended that the upper end was sealed through the baffle interval uniformly between stove core and the furnace body, four secondary air-supply pipes and four air inlet circulating pipe cross arrangement, furnace body lateral wall bottom sets up outer wall inlet opening, upper portion in the stove core bottom is provided with primary air inlet and the secondary air inlet with furnace intercommunication respectively, secondary air inlet and outer wall inlet opening all communicate with secondary air-supply pipe, secondary air-supply pipe and air inlet circulating pipe all communicate with furnace through primary air inlet.
Preferably, the primary air port and the secondary air port are conical holes, and the inner part is small and the outer part is large.
Preferably, the secondary air inlet pipe seals the upper end by a baffle.
Preferably, the hearth is of a horn-shaped structure with a small upper part and a large lower part.
Preferably, an upper layer combustion net and a lower layer combustion net are arranged in the hearth of the furnace core.
Preferably, the center of the upper layer combustion net is provided with a circular hole.
Preferably, the mesh aperture of the upper combustion net is larger than the mesh aperture of the lower combustion net.
Preferably, the upper layer combustion net and the lower layer combustion net are arranged in the hearth through a support, and the support is of a conical structure and is attached to the inner conical surface of the furnace core.
Preferably, the support comprises an upper ring, upright posts and a lower ring, wherein the upper ring is connected to the lower ring through four upright posts which are uniformly distributed, and the upper layer combustion net and the lower layer combustion net are respectively paved in the upper ring and the lower ring.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
(1) The invention improves the oxygen content and oxygen content uniformity in the hearth by arranging the secondary air inlet, promotes the complete combustion of the biological fuel, has higher fuel combustion utilization rate and combustion efficiency, is suitable for combusting biomass fuel with higher density, is provided with the air inlet circulating pipe for recycling flue gas, the secondary air inlet is arranged at the upper part of the upper layer of the combustion net according to test results, and the secondary air inlet has the characteristics of simple structure, low cost and convenience in disassembly and installation during manufacturing and use;
(2) According to the invention, through the secondary air inlet pipe and the air inlet circulating pipe which are arranged in a crossing way, the air inlet circulating pipe recirculates flue gas to flow from top to bottom, the secondary air supply flows from bottom to top, the recirculating flue gas can heat the secondary air supply, the energy utilization rate is improved, and the air return furnace is more energy-saving;
(3) The combustion net is arranged on the hearth to be layered, the large-block fuel is arranged on the upper layer to burn, the small-block fuel is arranged on the lower layer to burn, the upper layer net is determined to be placed at one quarter of the height of the furnace core through test results, the lower layer net is arranged at the bottom of the furnace core, layered burning is realized, the combustion can be mutually ignited, the combustion is promoted to be complete, the fuel utilization rate is high, the combustion efficiency is higher, and the furnace is more energy-saving and environment-friendly.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a cross-sectional structure of a secondary air port;
FIG. 3 is a schematic cross-sectional view of a primary tuyere;
FIG. 4 is a schematic view of the expanded structure of the secondary air inlet pipe and the recycled air inlet pipe;
FIG. 5 is a schematic view of a combustion net and bracket connection structure;
fig. 6 is a schematic view of a stent structure.
Description of the embodiments
The invention will be further described with reference to the accompanying drawings and specific examples.
Examples: as shown in fig. 1-6, a hierarchical air supply and flue gas recirculation system of a return air furnace comprises a furnace body 15, a furnace seat arranged at the bottom of the furnace body, a panel 20 at the top of the furnace body, a furnace cover 19 in the middle of the panel 20, a chimney 21 communicated with the upper end of a furnace core 1, and the furnace core 1 arranged in the furnace body 15, wherein the furnace core 1 and the furnace body 15 keep a gap and are uniformly separated into four secondary air inlet pipes 13 with sealed upper ends and four air inlet circulating pipes 14 with open upper ends through partition plates 17, the four secondary air inlet pipes 13 and the four air inlet circulating pipes 14 are arranged in a crossing manner, an outer wall air inlet hole 10 is arranged at the bottom of the side wall of the furnace body 15, a primary air inlet 11 and a secondary air inlet 12 which are communicated with a furnace 6 are respectively arranged at the middle upper part of the bottom of the furnace core 1, and the secondary air inlet 12 and the outer wall air inlet hole 10 are communicated with the secondary air inlet pipes 13, and the secondary air inlet pipes 13 and the air inlet circulating pipes 14 are communicated with the furnace 6 through the primary air inlet 11.
Preferably, the primary air port 11 and the secondary air port 12 are tapered holes, and the inner part is small and the outer part is large, so that the leakage of the flue gas is prevented.
Preferably, the secondary air inlet pipe 13 is sealed at the upper end by a baffle 16.
Preferably, the furnace 6 has a horn structure with a small upper part and a large lower part, and the furnace core is designed into a horn shape with a small upper part and a large lower part, so that a natural wind-drawing effect is formed, and air entering the furnace core can spontaneously flow upwards to provide sufficient oxygen for fuel combustion.
After the flue gas comes out of the furnace core, a part of the flue gas is limited by resistance at the outlet of the chimney and enters the air inlet circulation pipe for recirculation, a flue gas recirculation primary air inlet is arranged at the bottom of the furnace core and is staggered with a secondary air inlet pipe, the flue gas enters the hearth from the flue gas recirculation primary air inlet, combustible gas in the recirculated flue gas and unburnt fuel particles are combusted again, the recirculated flue gas flows from top to bottom, secondary air supply flows from bottom to top, and the recirculated flue gas can heat the secondary air supply due to the staggered arrangement of the four secondary air inlet pipes 13 and the four air inlet circulation pipes 14, so that the energy utilization rate is improved.
The burned fuel falls from the underlying combustion net through the ash discharge port into the ash discharge drawer 18.
Preferably, an upper layer combustion net 2 and a lower layer combustion net 3 are arranged in the hearth of the furnace core 1, the hearth is provided with the combustion net in layers, the upper layer is provided with a large block of fuel for combustion, the lower layer is provided with a small block of fuel for combustion, the fuel combustion is more sufficient, the fuel utilization rate is high, the combustion efficiency is higher, and the furnace is more energy-saving and environment-friendly.
Preferably, the center of the upper layer combustion net 2 is provided with a circular hole 4, and the ignition material is conveniently sent into the lower layer combustion net through the circular hole, and the aperture of each layer combustion net is the same.
Preferably, the mesh aperture of the upper layer combustion net 2 is larger than that of the lower layer combustion net 3, and the upper layer combustion net has larger aperture and only clamps large particle fuel, so that small particle fuel leaks onto the lower layer combustion net with smaller aperture.
Preferably, the upper layer combustion net 2 and the lower layer combustion net 3 are installed in the hearth 6 through the support 5, the support 5 is of a conical structure and is attached to the inner conical surface of the furnace core 1, and the upper layer combustion net and the lower layer combustion net are installed in the hearth through the support, so that the installation and maintenance are convenient.
Preferably, the support 5 comprises an upper circular ring 7, upright posts 8 and a lower circular ring 9, wherein the upper circular ring 7 is connected to the lower circular ring 9 through four upright posts 8 uniformly distributed, the upper combustion net 2 and the lower combustion net 3 are respectively paved in the upper circular ring 7 and the lower circular ring 9, and the support of the structure has the advantages of simple structure, low cost, convenient manufacture and stable support.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (7)
1. The utility model provides a hierarchical air supply and flue gas recirculation system of return air stove which characterized in that: the furnace comprises a furnace body (15) and a furnace core (1) arranged in the furnace body (15), wherein gaps are kept between the furnace core (1) and the furnace body (15) and are uniformly separated into four secondary air inlet pipes (13) with sealed upper ends and four air inlet circulating pipes (14) with open upper ends through partition plates (17), the four secondary air inlet pipes (13) and the four air inlet circulating pipes (14) are arranged in a crossing manner, an outer wall air inlet hole (10) is formed in the bottom of the side wall of the furnace body (15), a primary air inlet (11) and a secondary air inlet (12) which are communicated with a furnace chamber (6) are respectively formed in the middle upper part of the bottom of the furnace core (1), the secondary air inlet (12) and the outer wall air inlet hole (10) are both communicated with the secondary air inlet pipes (13), and the secondary air inlet pipes (13) and the air inlet circulating pipes (14) are both communicated with the furnace chamber (6) through the primary air inlet (11); the primary air port (11) and the secondary air port (12) are conical holes, and the inner part is small and the outer part is large; the hearth (6) is of a horn-shaped structure with a small upper part and a large lower part.
2. A staged air supply and flue gas recirculation system for a return air furnace as defined in claim 1, wherein: the upper end of the secondary air inlet pipe (13) is sealed by a baffle plate (16).
3. A staged air supply and flue gas recirculation system for a return air furnace as defined in claim 1, wherein: an upper layer combustion net (2) and a lower layer combustion net (3) are arranged in a hearth (6) of the furnace core (1).
4. A staged air supply and flue gas recirculation system for a return air furnace as defined in claim 3, wherein: the center of the upper layer combustion net (2) is provided with a circular hole (4).
5. A staged air supply and flue gas recirculation system for a return air furnace as defined in claim 3, wherein: the mesh aperture of the upper layer combustion net (2) is larger than that of the lower layer combustion net (3).
6. A staged air supply and flue gas recirculation system for a return air furnace as defined in claim 3, wherein: the upper layer combustion net (2) and the lower layer combustion net (3) are arranged in the hearth (6) through the support (5), and the support (5) is of a conical structure and is attached to the inner conical surface of the furnace core (1).
7. A staged air supply and flue gas recirculation system for a return air duct as defined in claim 6, wherein: the support (5) comprises an upper circular ring (7), upright posts (8) and a lower circular ring (9), wherein the upper circular ring (7) is connected to the lower circular ring (9) through four upright posts (8) which are uniformly distributed, and the upper layer combustion net (2) and the lower layer combustion net (3) are respectively paved in the upper circular ring (7) and the lower circular ring (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710226630.4A CN106931467B (en) | 2017-04-09 | 2017-04-09 | Graded air supply and flue gas recirculation system of return air furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710226630.4A CN106931467B (en) | 2017-04-09 | 2017-04-09 | Graded air supply and flue gas recirculation system of return air furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106931467A CN106931467A (en) | 2017-07-07 |
| CN106931467B true CN106931467B (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710226630.4A Active CN106931467B (en) | 2017-04-09 | 2017-04-09 | Graded air supply and flue gas recirculation system of return air furnace |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109654541A (en) * | 2017-10-10 | 2019-04-19 | 吴凯 | A kind of high-efficiency energy-saving firewood stove |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2052106U (en) * | 1989-04-14 | 1990-01-31 | 卢怀文 | Multifunctional gas producer with downward flue-gas duct |
| FR2681935A1 (en) * | 1991-10-01 | 1993-04-02 | En Systeme | Solid-fuel-fired boiler |
| CN2585071Y (en) * | 2002-06-24 | 2003-11-05 | 周作旺 | Energy-saving range with firepot arounded by spiral groove |
| CN1871478A (en) * | 2003-08-21 | 2006-11-29 | 夏普株式会社 | Heating cooker |
| CN1888580A (en) * | 2006-07-19 | 2007-01-03 | 刘勇 | Indoor and outdoor air double-circulating purification central heating apparatus |
| CN200975687Y (en) * | 2006-11-22 | 2007-11-14 | 刘平忠 | Secondary air heating stove |
| CA2656187A1 (en) * | 2006-06-26 | 2008-01-03 | Koninklijke Philips Electronics N.V. | A solid fuel stove with improved combustion |
| CN101151492A (en) * | 2005-03-29 | 2008-03-26 | 皇家飞利浦电子股份有限公司 | Improvements in cooking stoves |
| CN201289113Y (en) * | 2008-10-28 | 2009-08-12 | 李天碧 | Coal-firewood dual-purpose return range |
| CN201672551U (en) * | 2010-04-27 | 2010-12-15 | 简皓东 | Air return furnace with cylindrical flues |
| CN103438481A (en) * | 2013-09-13 | 2013-12-11 | 贵州大学 | Energy-saving air-returning water circulation coal-fired heating stove |
| CN104019468A (en) * | 2013-03-01 | 2014-09-03 | 鹤山市龙腾科技有限公司 | Internal recycling quantum heating coal stove free of emission |
| CN207006243U (en) * | 2017-04-09 | 2018-02-13 | 贵州大学 | A kind of air stage feeding of air return stove and flue gas recirculation system |
-
2017
- 2017-04-09 CN CN201710226630.4A patent/CN106931467B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2052106U (en) * | 1989-04-14 | 1990-01-31 | 卢怀文 | Multifunctional gas producer with downward flue-gas duct |
| FR2681935A1 (en) * | 1991-10-01 | 1993-04-02 | En Systeme | Solid-fuel-fired boiler |
| CN2585071Y (en) * | 2002-06-24 | 2003-11-05 | 周作旺 | Energy-saving range with firepot arounded by spiral groove |
| CN1871478A (en) * | 2003-08-21 | 2006-11-29 | 夏普株式会社 | Heating cooker |
| CN101151492A (en) * | 2005-03-29 | 2008-03-26 | 皇家飞利浦电子股份有限公司 | Improvements in cooking stoves |
| CA2656187A1 (en) * | 2006-06-26 | 2008-01-03 | Koninklijke Philips Electronics N.V. | A solid fuel stove with improved combustion |
| CN1888580A (en) * | 2006-07-19 | 2007-01-03 | 刘勇 | Indoor and outdoor air double-circulating purification central heating apparatus |
| CN200975687Y (en) * | 2006-11-22 | 2007-11-14 | 刘平忠 | Secondary air heating stove |
| CN201289113Y (en) * | 2008-10-28 | 2009-08-12 | 李天碧 | Coal-firewood dual-purpose return range |
| CN201672551U (en) * | 2010-04-27 | 2010-12-15 | 简皓东 | Air return furnace with cylindrical flues |
| CN104019468A (en) * | 2013-03-01 | 2014-09-03 | 鹤山市龙腾科技有限公司 | Internal recycling quantum heating coal stove free of emission |
| CN103438481A (en) * | 2013-09-13 | 2013-12-11 | 贵州大学 | Energy-saving air-returning water circulation coal-fired heating stove |
| CN207006243U (en) * | 2017-04-09 | 2018-02-13 | 贵州大学 | A kind of air stage feeding of air return stove and flue gas recirculation system |
Non-Patent Citations (1)
| Title |
|---|
| 工业锅炉仿真系统节能模块设计及实现;熊穗平;《中国特种设备安全》;20141030;第30卷(第10期);第19-21页 * |
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| CN106931467A (en) | 2017-07-07 |
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