CN110332522B - Heat accumulating type flue gas recirculation burner and combustion system - Google Patents
Heat accumulating type flue gas recirculation burner and combustion system Download PDFInfo
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- CN110332522B CN110332522B CN201910549652.3A CN201910549652A CN110332522B CN 110332522 B CN110332522 B CN 110332522B CN 201910549652 A CN201910549652 A CN 201910549652A CN 110332522 B CN110332522 B CN 110332522B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 151
- 239000003546 flue gas Substances 0.000 title claims abstract description 53
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000007789 gas Substances 0.000 claims abstract description 81
- 238000005338 heat storage Methods 0.000 claims abstract description 26
- 239000002737 fuel gas Substances 0.000 claims abstract description 24
- 239000000567 combustion gas Substances 0.000 claims description 5
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 239000002918 waste heat Substances 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 description 8
- 239000000779 smoke Substances 0.000 description 8
- 230000001154 acute effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000000446 fuel Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Images
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
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
- F23C3/006—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion
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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
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
- F23C6/042—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with fuel supply in stages
-
- 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
-
- 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
- F23L15/04—Arrangements of recuperators
-
- 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
- F23C2201/00—Staged combustion
- F23C2201/20—Burner staging
-
- 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)
Abstract
The invention discloses a heat accumulating type flue gas recirculation burner, which comprises a heat accumulating box and at least two stages of combustion chambers, wherein fuel gas and air respectively pass through the heat accumulating box and then enter the combustion chambers; a gas grading channel and an air grading channel are arranged between the heat storage box and the combustion chamber; the air classification channel is connected with a plurality of groups of flue gas recirculation channels for further introducing flue gas generated after combustion into the burner for combustion. The heat storage box, the multistage combustion chamber and the flue gas recirculation channel are integrated into a burner structure, so that fuel gas and air enter the staged combustion chamber after absorbing the heat of the heat storage box, the waste heat generated by the flue gas is fully utilized, and the energy is saved and the consumption is reduced; the gas and the air are supplemented into the multi-stage combustion chamber in a grading way, so that the combustion temperature is reduced, and the generation of NOx is reduced; through the design of forced backflow and recirculation of the flue gas, multi-stage combustion is further realized, and the requirements of national environmental protection on the emission level of NOx in the flue gas are met in the diversified combustion states of the fuel gas at different levels.
Description
Technical Field
The invention relates to the technical field of regenerative heating furnaces, in particular to a regenerative flue gas recirculation burner and a combustion system.
Background
At present, the traditional burner has low energy utilization rate and single combustion mode, and the generated amount of pollutants such as NOx is large and is difficult to meet the environmental protection standard. How to effectively control the generation and emission of NOx so as to improve the quality of the atmospheric environment is one of the important problems to be solved urgently in the current society. At the same time, increasingly stringent environmental regulations require the development of advanced technologies to reduce the emission of pollutants such as NOx. Therefore, the low NOx combustion technology has very important significance for energy conservation and emission reduction in China.
Low NOx combustion technologies are technologies that modify combustion equipment or control combustion conditions to reduce the concentration of NOx in the combustion exhaust. The main factors affecting the formation of NOx during combustion are the combustion temperature, the residence time of the flue gas in the high temperature zone, the concentration of the various components in the flue gas and the degree of mixing, and thus, varying the air-fuel ratio, the temperature of the combustion air, the degree of cooling of the combustion zone and the burner geometry can reduce the formation of NOx during combustion.
With the increasing emphasis on environmental protection in China, how to utilize the air classification combustion technology and develop the air classification technology to deep air classification, namely the development of air in the direction of multiple air classifications, is a great trend of industrial furnace burners.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a heat accumulating type flue gas recirculation burner which realizes multi-stage combustion of fuel gas in a forced backflow recirculation mode, reduces the temperature of the fuel gas during combustion with air, and effectively inhibits and reduces the generation and emission of NOx.
The invention also provides a combustion system adopting the burner.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a heat accumulating type flue gas recirculation burner comprises a heat accumulating box and at least two stages of combustion chambers, wherein fuel gas and air respectively pass through the heat accumulating box and then enter the combustion chambers; a fuel gas grading channel and an air grading channel are arranged between the heat storage box and the combustion chamber; the air classification channel is connected with a plurality of groups of flue gas recirculation channels for further introducing flue gas generated after combustion into the burner for combustion.
Furthermore, the heat storage box comprises a gas heat storage box and an air heat storage box, gas flows through a gas channel after passing through the gas heat storage box and enters the gas grading channel, and air flows through an air flue gas channel after passing through the air heat storage box and enters the air grading channel.
Further, the combustion chamber includes one-level combustion chamber and second grade combustion chamber, be provided with a plurality of on the inlet end face of one-level combustion chamber and follow the one-level gas hole that the hierarchical passageway of gas was drawn forth, it follows to slope on the radial lateral wall of one-level combustion chamber the combustion-supporting air gas pocket that the hierarchical passageway of air was drawn forth is provided with a plurality of, and is a plurality of the axial centerline of combustion-supporting air gas pocket assembles on the horizontal axis of one-level combustion chamber.
Furthermore, the primary combustion chamber is communicated with the secondary combustion chamber, a plurality of swirl air holes led out from the air classification channel are formed in the end face of the secondary combustion chamber, and the plurality of swirl air holes are circumferentially formed outside the primary combustion chamber.
Furthermore, the rotational flow air holes are a plurality of columnar air holes which are obliquely arranged, and the acute angle between the rotational flow air holes and the tangential direction of the circumference is 30-60 degrees.
Furthermore, a plurality of secondary fuel gas holes led out from the fuel gas grading channel are circumferentially arranged on the periphery of the secondary combustion chamber, and the axial center lines of the plurality of secondary fuel gas holes are converged on the horizontal axis of the secondary combustion chamber.
Further, the secondary combustion chamber is connected with a hearth of the industrial furnace, the secondary gas hole extends to the end face of the hearth in an inclined mode, and an acute angle formed by the secondary gas hole and the horizontal direction is 30-45 degrees.
Further, the primary combustion chamber, the secondary combustion chamber and the hearth are arranged concentrically to form three-stage combustion of gas inside the burner.
Further, the cross sections of the rotational flow air holes and the secondary fuel gas holes are circular or polygonal.
Furthermore, a plurality of honeycomb heat accumulators or heat accumulating balls are arranged in the heat accumulating box.
Furthermore, the burner also comprises a shell, and a heat insulation material is filled between the shell and the heat storage box.
Further, the air classification channel is an annular cavity circumferentially surrounding the periphery of the primary combustion chamber.
Further, the inlet end of the flue gas recirculation passage is provided with a valve for controlling the backflow of the flue gas.
A heat accumulating type flue gas recirculation combustion system comprises burners symmetrically arranged on two sides of a hearth.
According to the invention, the heat storage box, the multistage combustion chamber and the flue gas recirculation channel are integrated into a burner structure, so that fuel gas and air enter the staged combustion chamber after absorbing the heat of the heat storage box, the waste heat generated by the flue gas is fully utilized, and the energy is saved and the consumption is reduced; the gas and the air are supplemented into the multi-stage combustion chamber in a grading way, so that the combustion temperature is reduced, and the generation of NOx is reduced; through the design of forced backflow and recirculation of the flue gas, the flue gas is recirculated and returned to the air classification channel, the concentration of oxygen is reduced, multi-stage combustion is further realized, and the generation of NOx is effectively inhibited.
Drawings
FIG. 1 is a schematic sectional view of the burner of the present invention;
FIG. 2 is a schematic top sectional view of the burner of the present invention;
FIG. 3 is a schematic right-view structural diagram of the burner of the present invention.
In the figure, 1-shell, 2-gas heat storage box, 3-air heat storage box, 4-heat preservation rock wool, 5-heat storage body, 6-gas grading channel, 7-first-stage combustion chamber, 8-first-stage gas hole, 9-air grading channel, 10-combustion-supporting air hole, 11-second-stage combustion chamber, 12-cyclone air hole, 13-flue gas recirculation channel, 14-valve, 15-second-stage gas hole, 16-gas channel and 17-air flue gas channel.
Detailed Description
In the description of the present embodiment, the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as specifically indicating or implying relative importance.
To clearly illustrate the idea of the present invention, the present invention is described below with reference to examples.
A heat accumulating type flue gas recirculation burner is connected with a hearth of an industrial furnace and comprises a heat accumulating box and at least two stages of combustion chambers, wherein fuel gas and air respectively pass through the heat accumulating box and then enter the combustion chambers; a fuel gas grading channel and an air grading channel are arranged between the heat storage box and the combustion chamber; the air classification channel is connected with a plurality of groups of flue gas recirculation channels for further introducing flue gas generated after combustion into the burner for combustion.
The burner mainly comprises a heat storage unit, a staged combustion unit and a flue gas backflow forced recirculation channel. Before entering the combustion chamber, air and fuel gas are respectively subjected to heat exchange through the heat storage unit to absorb heat on the heat accumulator, so that the temperature required by combustion is ensured, and the fuel consumption is saved.
The gas and the air entering the multi-stage combustion chambers from the gas grading passage and the air grading passage reduce the combustion temperature in each stage of combustion chamber and effectively inhibit the generation of NOx, and the multi-stage combustion mode enables the gas to be combusted more fully, effectively improves the grading level of the air and further reduces the generation amount of the NOx.
Through adopting flue gas backward flow forced recirculation passageway, let in the air classification passageway with the flue gas that produces after the burning, reduced the concentration of oxygen, further realize low NOx's multistage burning.
In order to more clearly illustrate the technical solution of the present invention, the following description is made in the form of specific embodiments.
Example 1
Referring to fig. 1-3, the heat accumulating type flue gas recirculation burner of the embodiment includes a gas heat accumulating box 2, an air heat accumulating box 3, a primary combustion chamber 7 and a secondary combustion chamber 11, wherein gas passes through the gas heat accumulating box 2 and then flows through a gas channel 16 to enter a gas grading channel 6, air passes through the air heat accumulating box 3 and then flows through an air flue gas channel 17 to enter an air grading channel 9, and gas and air respectively enter a primary combustion chamber, a secondary combustion chamber and a hearth of an industrial furnace through the gas grading channel 6 and the air grading channel 9; the air grading channel 9 is connected with a flue gas recirculation channel 13 for introducing flue gas generated after combustion into the burner for combustion, and finally achieving the purpose of multi-stage combustion.
The gas grading channel 6 is communicated with the first-stage combustion chamber 7 through a first-stage gas hole 8, and the air grading channel 9 is communicated with the first-stage combustion chamber 7 through a combustion-supporting air hole 10. In the embodiment, the primary combustion gas holes 8 are three horizontal channels which surround the center of the primary combustion chamber 7 and are led out from the gas grading channel 6, and the tail ends of the primary combustion gas holes 8 are connected to the air inlet end face of the primary combustion chamber 7; the air classification channel 9 is an annular cavity circumferentially surrounding the periphery of the primary combustion chamber 7, the combustion-supporting air holes 10 are three inclined channels led out from the air classification channel 9, the tail ends of the combustion-supporting air holes 10 are connected to the radial side wall of the primary combustion chamber 7, the three combustion-supporting air holes 10 are circumferentially distributed, the axial center lines extend and converge on the horizontal axis of the primary combustion chamber 7, the intersection points are located in the primary combustion chamber 7, the primary gas holes 8 and the combustion-supporting air holes 10 are arranged in a staggered mode, and therefore gas and combustion-supporting air are effectively mixed in the combustion chamber. When the combustor works, gas and air are mixed in the primary combustion chamber 7 to perform primary combustion. Because the number of the first-stage gas holes and the combustion-supporting air holes is only three, the pipe diameters are smaller, the gas quantity of the gas and the air at the moment is smaller, the flame temperature is lower during combustion, the generated NOx is relatively less, and meanwhile, the gas inlet combustion proportion is larger than the air inflow of the air, so that the generated oxygen-deficient combustion atmosphere synchronously reduces the generated NOx.
The secondary combustion chamber 11 is communicated with the primary combustion chamber 7, the secondary combustion chamber 11 is larger than the inner diameter of the primary combustion chamber 7, 8 swirl air holes 12 led out from the air classification channel 9 are formed in the end face of the secondary combustion chamber 11, and the 8 swirl air holes 12 are circumferentially formed in the outer portion of the primary combustion chamber 7. The swirl air holes 12 are obliquely arranged in a cylindrical shape and are distributed annularly along the center of the secondary combustion chamber 11, and the acute angle between the swirl air holes 12 and the tangential direction of the circumference is 30 degrees. During specific work, partial air enters the secondary combustion chamber 11 in a rotational flow state after passing through the 8 rotational flow air holes 12, and is forced to rotate in the secondary combustion chamber 11 to generate a vortex entrainment effect, the outer edge of the rotational flow forms strong rotational flow impact, negative pressure is generated at the center of the rotational flow, the negative pressure at the center of the rotational flow can effectively attract smoke and unburnt gas generated from the primary combustion chamber 7, mixed gas forms entrainment rotary airflow, air, smoke and gas are mixed in the airflow, and the smoke and the gas are combusted again under the flame sprayed out from the primary combustion chamber 7.
New fuel gas is not supplemented in the secondary combustion chamber 11, 8 secondary fuel gas holes 15 led out from the tail end of the fuel gas classification channel 6 are circumferentially arranged on the periphery of the secondary combustion chamber 11, and the axial center lines of the 8 secondary fuel gas holes 15 are converged on the horizontal axis of the secondary combustion chamber 11. Specifically, the downstream of the secondary combustion chamber 11 is connected with a hearth of an industrial furnace, the secondary gas holes 15 are obliquely arranged, the acute angle of the included angle between the extension direction and the horizontal direction is 30 degrees, the tail ends of the secondary gas holes are connected with the air inlet end face of the hearth, the supplemented gas enters the hearth to be combusted in the next stage, and the axial center lines of the secondary combustion holes are finally converged on the horizontal center line of the hearth. The first-stage combustion chamber 7, the second-stage combustion chamber 11 and the hearth are arranged concentrically, and three-stage combustion of fuel gas and air in the hearth is formed. Through this kind of mode of setting, can guarantee the smooth and easy nature that gas and air mended, make gas and air mix more evenly in furnace, finally constitute the multistage burning of gas in furnace. In each stage combustion process, because the gradually supplemented external gas comprises gas and air entering the primary combustion chamber 7, swirl air supplemented in the secondary combustion chamber 11 and gas supplemented in the hearth are introduced from the gas stage passage 6 and the air stage passage 9, the gas and the air in the stage passage only absorb the heat of the heat accumulator 5 and do not participate in combustion, the temperature is low, and the combustion temperature in the corresponding combustion state can be reduced after the gas and the air in the stage passage are introduced into the combustion chamber; in each stage of combustion chamber, the dispersed combustion is formed through the air inlet channels which are circumferentially or symmetrically and uniformly distributed, so that the gas and the air are mixed more uniformly; in addition, in the whole combustion process of the burner, the combustion proportion of the gas inlet is larger than the air inlet quantity of the air, so that the first-stage combustion and the second-stage combustion are always in an oxygen-deficient combustion state. The three angles are combined, the generation of NOx is favorably reduced, and meanwhile, the requirements of national environmental protection on the emission level of NOx in the smoke can be completely met in the combustion state of diversified fuel gas in different levels.
In the invention, a group of flue gas recirculation channels 13 are arranged on the air grading channel 9, one end of each channel is connected with the air grading channel 9, and the other end of each channel is connected with a smoke exhaust main pipe of a combustion system through a valve 14. When the device works, the discharged flue gas is forced to flow back into the flue gas recirculation channel 13 through the induced draft fan, and enters the air classification channel 9 through the valve 14 for adjusting the flue gas backflow amount, so that the flue gas is recirculated and combusted again, and NOx in the flue gas is reduced again. Of course, in order to ensure the recycling efficiency, two or more groups can be arranged according to the actual concrete situation besides one group, and each group of recycling channels is independently provided with valve control.
The nozzle in this embodiment still includes casing 1, and air heat accumulation case 3 and gas heat accumulation case 2 are installed inside casing 1, and it has heat preservation rock wool 4 to fill between casing 1 and heat accumulation case, has reduced thermal loss, improves the heat accumulation effect of heat accumulation case. In the heat accumulation case, be provided with by a plurality of honeycomb heat accumulators 5 for absorb the heat of flue gas, preheat gas and air, the fuel consumption of saving to realize the optimal utilization of the energy.
The invention also provides a heat accumulating type flue gas recirculation combustion system, wherein the burners are symmetrically arranged on two sides of the hearth. During specific work, the two burners are in an open-close state, smoke generated in the hearth enters the burners in the close state through the pipelines, and high-temperature smoke transfers heat to the heat accumulator 5 when passing through the heat accumulation box of the burners and is finally discharged through the smoke exhaust header pipe. Through heat accumulation formula flue gas recirculation combustion system, can realize multistage burning, and reduced the temperature when gas and air burn, effectively reduced NOx's emission level. Meanwhile, the air input of the fuel gas and the air is adjusted in real time by monitoring the oxygen content in the flue gas in the hearth.
Example 2
The structure in this embodiment is basically the same as that in embodiment 1, except that the acute angle of the included angle between the rotational flow air hole and the tangential direction of the circumference is 60 degrees, the acute angle of the included angle between the secondary gas hole and the horizontal direction is 45 degrees, the rotational flow air hole and the secondary gas hole are square column holes, and a plurality of heat storage balls are arranged in the heat storage tank.
According to the design concept of the invention, besides the structure, the inclination angles of the swirl air holes and the secondary gas holes can be adjusted according to the actual condition; the heat storage box can also be formed by mixing a plurality of honeycomb heat accumulators and heat storage balls; in addition, the number of the primary gas holes, the combustion-supporting air holes, the rotational flow holes and the secondary gas holes can be adjusted according to specific combustion conditions; the number of the primary gas holes and the number of the combustion-supporting air holes, and the number of the swirl air holes and the number of the secondary gas holes may be the same or different, and are not limited to the number of the primary gas holes and the number of the swirl air holes, and the like in the embodiments.
Finally, it is to be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not intended to be limiting. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as within the scope of the invention.
Claims (7)
1. A heat accumulating type flue gas recirculation burner is characterized by comprising a heat accumulating box and at least two stages of combustion chambers, wherein fuel gas and air respectively pass through the heat accumulating box and then enter the combustion chambers; a fuel gas grading channel and an air grading channel are arranged between the heat storage box and the combustion chamber; the air classification channel is connected with a plurality of groups of flue gas recirculation channels for further introducing flue gas generated after combustion into the burner for combustion; the combustion chamber comprises a primary combustion chamber and a secondary combustion chamber, a plurality of primary gas holes led out from the gas grading channel are formed in the gas inlet end face of the primary combustion chamber, a plurality of combustion-supporting air holes led out from the air grading channel are obliquely formed in the radial side wall of the primary combustion chamber, the axial center lines of the combustion-supporting air holes are converged on the horizontal axis of the primary combustion chamber, and the primary gas holes and the combustion-supporting air holes are arranged in a staggered mode; the primary combustion chamber is communicated with the secondary combustion chamber, a plurality of swirl air holes led out from the air grading channel are formed in the air inlet end face of the secondary combustion chamber, and the plurality of swirl air holes are circumferentially arranged outside the primary combustion chamber; the periphery of the secondary combustion chamber is circumferentially provided with a plurality of secondary combustion gas holes led out from the gas grading channel, the axial center lines of the secondary combustion gas holes are converged on the horizontal axis of the secondary combustion chamber, and the secondary combustion gas holes are formed in the outlet of the secondary combustion chamber.
2. The burner of claim 1, wherein the heat storage tank comprises a gas heat storage tank through which gas flows through a gas passage into the gas staging passage, and an air heat storage tank through which air flows through an air flue gas passage into the air staging passage.
3. The burner of claim 1, wherein the swirl holes are a plurality of obliquely arranged cylindrical holes, and the included angle between the swirl holes and the tangential direction of the circumference is 30-60 degrees.
4. The burner of claim 1, wherein the secondary combustion chamber is connected with a hearth of an industrial furnace, the secondary gas hole extends obliquely to the gas inlet end surface of the hearth, and the included angle between the secondary gas hole and the horizontal direction is 30-45 degrees.
5. The burner of claim 1, wherein the air staging passage is an annular cavity circumferentially surrounding the periphery of the primary combustion chamber.
6. The burner of claim 1, wherein the inlet end of the flue gas recirculation channel is provided with a valve for controlling the return flow of flue gas.
7. A regenerative flue gas recirculation combustion system comprising the burner of any one of claims 1-6 symmetrically installed on both sides of an industrial furnace hearth.
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| CN201910549652.3A CN110332522B (en) | 2019-06-24 | 2019-06-24 | Heat accumulating type flue gas recirculation burner and combustion system |
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| CN201910549652.3A CN110332522B (en) | 2019-06-24 | 2019-06-24 | Heat accumulating type flue gas recirculation burner and combustion system |
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| CN210462995U (en) * | 2019-06-24 | 2020-05-05 | 秦皇岛鸿泰科技股份有限公司 | Heat accumulating type flue gas recirculation burner and combustion system |
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| KR20030052894A (en) * | 2001-12-21 | 2003-06-27 | 재단법인 포항산업과학연구원 | VENTURI TYPE LOW NOx BURNER |
| CN101936530A (en) * | 2010-09-29 | 2011-01-05 | 中国石油化工股份有限公司 | Multi-point combustion long-flame gas burner with ultralow nitrogen oxide (NOx) emission |
| CN103363811A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | Combustion method for mixing oxygen into high-temperature flue gas |
| CN203147763U (en) * | 2013-03-22 | 2013-08-21 | 湖南吉祥石化科技股份有限公司 | Multi-stage fuel flat wall flame low NOX gas burner |
| CN104791777B (en) * | 2015-04-09 | 2017-11-21 | 上海嘉德环境能源科技有限公司 | One kind reduces NO using flue gas self-loopaXCombustion method |
| CN106224960A (en) * | 2016-07-27 | 2016-12-14 | 北京神雾环境能源科技集团股份有限公司 | A kind of heat accumulation type radiant tube gradual combustor and combustion method thereof |
| CN206055625U (en) * | 2016-07-27 | 2017-03-29 | 北京神雾环境能源科技集团股份有限公司 | A kind of heat accumulation type radiant tube gradual combustor |
| CN107842853B (en) * | 2017-11-26 | 2024-04-30 | 湖北满天星节能环保科技有限公司 | Universal double purifying flameless energy-saving burner |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN210462995U (en) * | 2019-06-24 | 2020-05-05 | 秦皇岛鸿泰科技股份有限公司 | Heat accumulating type flue gas recirculation burner and combustion system |
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