CN107677137B - Energy-saving environment-friendly combustion system of smoke combustion-supporting industrial furnace - Google Patents

Energy-saving environment-friendly combustion system of smoke combustion-supporting industrial furnace Download PDF

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Publication number
CN107677137B
CN107677137B CN201710840051.9A CN201710840051A CN107677137B CN 107677137 B CN107677137 B CN 107677137B CN 201710840051 A CN201710840051 A CN 201710840051A CN 107677137 B CN107677137 B CN 107677137B
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China
Prior art keywords
inlet
flue gas
combustion
air outlet
cylinder
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CN201710840051.9A
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CN107677137A (en
Inventor
刘效洲
张宇
刘文星
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Guangdong University of Technology
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Guangdong University of Technology
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Priority to CN201710840051.9A priority Critical patent/CN107677137B/en
Publication of CN107677137A publication Critical patent/CN107677137A/en
Priority to PCT/CN2018/106180 priority patent/WO2019052573A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/82—Preventing flashback or blowback
    • 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
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14021—Premixing burners with swirling or vortices creating means for fuel or air
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)

Abstract

The invention discloses an energy-saving and environment-friendly combustion system of a smoke combustion-supporting industrial furnace, which comprises the following components: the burner comprises a furnace body, a burner and a heat exchanger, wherein the furnace body is provided with a first flue and a second flue; the burner is provided with a first inlet and a second inlet; the heat exchanger is provided with a high-temperature flue gas inlet, a cold air inlet, a low-temperature flue gas outlet and a hot air outlet, wherein the high-temperature flue gas inlet is connected with a first flue, the low-temperature flue gas outlet is connected with a chimney, the cold air inlet is connected with a first fan, the hot air outlet is connected with a first inlet of the burner, and a second flue is connected with a second inlet; the burner comprises: the device comprises a central tube, an inner cylinder sleeved outside the central tube, an outer cylinder sleeved outside the inner cylinder, and a truncated cone-shaped mixing cavity connected between the outer cylinder and a furnace body, wherein a first inlet is communicated with a first annular space formed between the outer wall of the central tube and the inner wall of the inner cylinder, and a second inlet is communicated with a second annular space formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder.

Description

Energy-saving environment-friendly combustion system of smoke combustion-supporting industrial furnace
Technical Field
The invention relates to the technical field of energy conservation and environmental protection, in particular to an energy conservation and environmental protection combustion system capable of improving combustion efficiency and reducing emission of nitrogen oxides.
Background
Currently, with the development of industry, energy prices are continuously raised, environmental pollution is continuously increased, and the environmental protection departments around the world have strict requirements on the emission standard of industrial boilers/kilns. Existing boilers and kilns are an important component of the modern industry that can provide good combustion conditions in order to maximize the release of chemical energy from the fuel and its conversion to thermal energy. When the boiler and the kiln work, a large amount of flue gas is discharged, and the flue gas with higher heat energy is directly discharged into the atmosphere, so that not only is energy wasted, but also the environment is polluted.
The use quantity of industrial boiler/kiln is great, and current combustor has certain drawback, mainly embodies: (1) The content of nitrogen oxides in the discharged flue gas is large, so that the environmental pollution is aggravated; (2) The waste heat of the flue gas is not effectively utilized, the combustion is insufficient, and the combustion efficiency is low; (3) The existing burner is unreasonable in structural design, so that insufficient combustion is caused.
Currently, combustion of air and fuel in a furnace generates more Nitrogen Oxides (NO) due to higher oxygen concentration x ) More NO x On the one hand, the emissions of (a) can lead to serious environmental pollution and, on the other hand, NO x The lung of a human body can be stimulated, so that people can easily infect respiratory diseases such as cold, and people with respiratory problems, such as asthmatics, can be easily influenced by nitrogen dioxide; for children, nitrogen oxides may cause impaired lung development. Studies have shown that prolonged inhalation of nitrogen oxides may lead to changes in lung architecture, but that the nitrogen oxide content and time to inhale gas leading to such consequences may not be determined.
Thereby, high combustion efficiency and low NO x Emissions problems are critical issues facing boiler and industrial furnace combustion. Reducing the oxygen concentration in the combustion zone is beneficial for reducing NO x But often also affects combustion efficiency. The existing flue gas recirculation combustion technology (such as Chinese patent publication CN1844817A and CN 1360192A) can reduce the oxygen concentration in the combustion area due to the cyclic utilization of part of flue gas, but the temperature of the circulating flue gas of the technology is much lower than that of the combustion flue gas of a hearth, and the temperature of the area can be reduced by sending the low-temperature circulating flue gas into the combustion area, so that the combustion efficiency of the burner is affected.
In addition, reducing agents (ammonia, urea, alkane and the like) are mainly used in industry to chemically react with nitrogen oxides to neutralize the nitrogen oxides, the process mainly comprises a Selective Catalytic Reduction (SCR) method, a selective non-catalytic reduction (SNCR) method and the like, and nitrogen and water are generated after the ammonia reacts with the nitrogen oxides, so that pollution-free emission is achieved, but the treatment process is complex in operation and high in running cost.
Therefore, a method for fully utilizing the residual flue gas is soughtHeat, NO x A combustion system with low emission, energy conservation and environmental protection is a problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace, which has the advantages of high combustion efficiency, waste heat recovery function and capability of effectively reducing the content of discharged nitrogen oxides.
In order to achieve the above purpose, the invention provides an energy-saving and environment-friendly combustion system of a flue gas combustion-supporting industrial furnace, which comprises: the furnace body, the burner and the heat exchanger which are connected with the furnace body, and a first flue is arranged at one side of the rear end of the furnace body; the burner is arranged at the front end of the furnace body and is communicated with a hearth of the furnace body, and the burner is provided with a first inlet; the heat exchanger is provided with a high-temperature flue gas inlet, a cold air inlet, a low-temperature flue gas outlet and a hot air outlet, the high-temperature flue gas inlet is connected with the first flue, the low-temperature flue gas outlet is connected with the chimney through a pipeline, the cold air inlet is connected with the first fan, the hot air outlet is connected with the first inlet of the combustor through a hot air conveying pipe, so that hot air formed by heat exchange of cold air introduced into the heat exchanger through the first fan is conveyed into the combustor for combustion supporting; the other side of the rear end of the furnace body is provided with a second flue, the burner is also provided with a second inlet, wherein the second flue is connected with the second inlet through a flue gas conveying pipe so as to convey part of high-temperature flue gas into the burner for combustion supporting; the burner includes: the device comprises a central tube, an inner cylinder sleeved outside the central tube, an outer cylinder sleeved outside the inner cylinder, and a truncated cone-shaped mixing cavity connected between the outer cylinder and a furnace body, wherein a first inlet is communicated with a first annular space formed between the outer wall of the central tube and the inner wall of the inner cylinder, and a second inlet is communicated with a second annular space formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder.
Therefore, cold air at 20 ℃ introduced into the heat exchanger through the first fan exchanges heat with high-temperature smoke at 400 ℃ in the heat exchanger, the formed hot air at 200 ℃ is conveyed into the burner, and the cooled low-temperature smoke at 120 ℃ is discharged to the chimney.
Optionally, a second fan is arranged on a pipeline connected between the low-temperature flue gas outlet and the chimney to smoothly discharge the low-temperature flue gas at 120 ℃ to the chimney.
Optionally, a third fan is arranged on the flue gas conveying pipe to smoothly convey the high-temperature flue gas with the temperature of 400 ℃ accounting for 10-40% of the total volume of the flue gas to the burner.
Optionally, the front end of the inner cylinder is closed, and a first annular porous plate connecting the inner cylinder and the central tube is arranged in the first annular space adjacent to the rear port of the inner cylinder; at least five circles of first air outlet holes are formed in the annular surface of the first annular porous plate; the shape of the first air outlet hole is set to be elliptical and the equivalent diameter is 2-3 mm.
Optionally, the front end of the outer cylinder is closed, and a second annular porous plate connecting the inner cylinder and the central tube is arranged in the first annular space adjacent to the front end wall of the outer cylinder; at least three circles of second air outlet holes are arranged on the ring surface of the second annular porous plate, the shape of each second air outlet hole is set to be triangle or diamond, and the equivalent diameter is 5-8 mm.
Optionally, at least five circles of first air outlet holes are arranged at equal intervals along the radial direction, and each circle of first air outlet holes and the adjacent circle of first air outlet holes are respectively staggered in the radial direction and the circumferential direction; at least three circles of second air outlet holes are arranged at equal intervals along the radial direction, and each circle of second air outlet holes and the adjacent circle of second air outlet holes are respectively staggered in the radial direction and the circumferential direction.
Alternatively, the first inlet is disposed in tangential communication with the first annular space adjacent the forward end wall of the inner barrel and the second inlet is disposed in tangential communication with the second annular space adjacent the forward end wall of the outer barrel.
Alternatively, the first inlet may be disposed in communication with the first annular space in a radial direction adjacent the forward end wall of the inner barrel.
Optionally, an igniter and a flame detector are arranged in the central tube, and the outlet end of the central tube is flush with the outlet ends of the inner tube and the outer tube.
Optionally, the first inlet is connected with the hot air conveying pipe through the connecting cylinder, is provided with the gas cylinder that is used for introducing gaseous fuel to the combustor on the section of thick bamboo wall of connecting cylinder, is equipped with the gas distribution board in the gas cylinder, is equipped with a plurality of gas hole on the gas distribution board.
Optionally, the gas fuel is natural gas, liquefied petroleum gas or artificial gas.
Alternatively, the gas holes are distributed on the gas distribution plate in a triangular shape, the shape of the gas holes is set to be triangular or diamond-shaped holes, and the equivalent diameter is 1-2 mm.
Optionally, the diameter of the outlet end of the truncated cone-shaped mixing cavity is set to be 35% -75% of the diameter of the inlet end of the truncated cone-shaped mixing cavity, and the outer cylinder, the truncated cone-shaped mixing cavity, the inner cylinder and the central tube are coaxial.
Compared with the prior art, the invention has the following beneficial effects: (1) The hot air is adopted for supporting combustion, so that the fuel can not only be burnt in a low-oxygen way, but also can be burnt fully to release the highest heat value; (2) 10-40% of high-temperature flue gas is recycled for auxiliary combustion, so that high-temperature low-oxygen combustion can be realized, and the emission of nitrogen oxides is effectively reduced; (3) The combustion of the fuel can be further accelerated and the burnout rate is improved by adopting part of high-temperature hot flue gas and hot air for supporting combustion, and the waste heat recovery is facilitated and the energy is saved; (4) The combustion efficiency is improved, the temperature is improved, and the combustion is fully carried out in a low-oxygen state, so that the emission of nitrogen oxides can be reduced by more than 40%; (5) The multi-layer sleeve type burner structure and the annular porous plate are adopted, so that fuel, fuel gas and smoke can be fully and uniformly mixed, and the combustion efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the construction of the energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace.
Fig. 2 is a schematic view of the structure of the burner of the present invention.
Fig. 3 is a schematic view showing the construction of a first annular perforated plate according to the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring first to fig. 1, according to one non-limiting embodiment of the present invention, the energy-saving and environment-friendly combustion system for a flue gas combustion-supporting industrial furnace of the present invention includes: furnace body 100, burner 200 and heat exchanger 300.
In this non-limiting embodiment, a first flue 110 is provided at a rear end side of the furnace body 100. The burner 200 is installed at the front end of the furnace body 100 and communicates with the furnace chamber of the furnace body 100, and the burner 200 is provided with a first inlet 201.
The heat exchanger 300 is provided with a high temperature flue gas inlet 310, a cold air inlet 320, a low temperature flue gas outlet 330 and a hot air outlet 340, wherein the high temperature flue gas inlet 310 is connected with the first flue 110, the cold air inlet 320 is connected with the first fan F1, and the hot air outlet 340 is connected with the first inlet 201 of the burner 200 through a hot air conveying pipe L1. Thus, after 20 degrees celsius cold air is introduced into the heat exchanger 300 through the first fan F1 and subjected to heat exchange, the formed hot air of about 200 degrees celsius is delivered into the burner 200 through the hot air delivery pipe L1 for supporting combustion, and a second fan F2 is provided on a pipeline communicating with the low temperature flue gas outlet 330, and the cooled hot air is discharged to the chimney 400 at about 120 degrees celsius by the second fan F2.
In this non-limiting embodiment, the other side of the rear end of the furnace body 100 is provided with a second flue 120, and the burner 200 is further provided with a second inlet 202, and the second flue 120 is connected to the second inlet 202 through a flue gas duct L2. Thus, the high temperature flue gas of about 400 degrees celsius, which is 10 to 40% of the total volume of the flue gas, is smoothly transferred into the burner 200 for secondary combustion supporting by the third fan F3 provided on the flue gas transfer pipe L2.
In this non-limiting embodiment, as shown in FIG. 2, the combustor 200 includes: an outer barrel 210, a conical mixing chamber 220, an inner barrel 230 and a center tube 240.
In this non-limiting embodiment, the first inlet 201 of the burner 200 communicates with a first annular space 270 formed between the outer wall of the center tube 240 and the inner wall of the inner barrel 230, and the second inlet 202 of the burner 200 communicates with a second annular space 280 formed between the outer wall of the inner barrel 230 and the inner wall of the outer barrel 210.
The circular truncated cone-shaped mixing chamber 220 is connected between the outer cylinder 210 and the furnace body 100, an inlet end thereof is connected with the outer cylinder 210, an outlet end thereof is connected with the furnace body 100, an outlet end diameter of the circular truncated cone-shaped mixing chamber 220 is set to about 50% of an inlet end diameter of the circular truncated cone-shaped mixing chamber, a diameter of the outer cylinder 210 is slightly identical to that of the inlet end of the circular truncated cone-shaped mixing chamber 220, a diameter of the inner cylinder 230 is set to about 70% of a diameter of the outer cylinder 210, and a diameter of the center tube 240 is set to about 30% of a diameter of the inner cylinder 230. The outer barrel 210, the frustoconical mixing chamber 220, the inner barrel 230, and the center tube 240 are coaxial, thereby facilitating gas communication.
As one non-limiting embodiment, the forward end of the inner barrel 230 is closed and a first annular perforated plate 250 is disposed in the first annular space 270 adjacent the aft end of the inner barrel 230 connecting the inner barrel 230 and the center tube 240. As shown in fig. 3, six circles of first air outlet holes 251 are provided on the annulus of the first annular porous plate 250, the shape of the first air outlet holes 251 is set to be elliptical and the equivalent diameter is 2-3 mm, and the six circles of first air outlet holes 251 are arranged at equal intervals along the radial direction, and each circle of first air outlet holes 251 is respectively staggered with the adjacent circle of first air outlet holes 251 along the radial direction and the circumferential direction.
A second annular perforated plate 260 is disposed within the first annular space 270 adjacent the front end wall of the outer barrel 210, connecting the inner barrel 230 and the center tube 240. At least three circles of second air outlet holes 261 are arranged on the ring surface of the second annular porous plate 260, the shape of the second air outlet holes 261 is set to be triangle or diamond, the equivalent diameter is 5-8 mm, the layout of the second air outlet holes is similar to that of the first air outlet holes 251, at least three circles of second air outlet holes 261 are arranged at equal intervals along the radial direction, and each circle of second air outlet holes and the adjacent circle of second air outlet holes are respectively arranged in a staggered manner along the radial direction and the circumferential direction.
In this non-limiting embodiment, the first inlet 201 of the burner 200 is disposed in tangential communication with the first annular space 270 adjacent the forward end wall of the inner barrel 230 and the second inlet 202 of the burner 200 is disposed in tangential communication with the second annular space 280 adjacent the forward end wall of the outer barrel 210.
As a non-limiting embodiment, an igniter and flame detector (not shown) are disposed within the center tube 240, with the outlet end of the center tube 240 flush with the outlet ends of the inner and outer barrels 230, 210.
As one non-limiting embodiment, as shown in fig. 2, the first inlet 201 of the burner 200 is connected to the hot air delivery pipe L1 through the connection tube 290, thereby introducing hot air into the burner 200. The gas cylinder 291 for introducing the gas fuel into the burner 200 is provided on the wall of the connecting cylinder 290, the gas cylinder is provided with a gas distribution plate 2911, and the gas distribution plate is provided with a plurality of gas holes, so that the gas fuel can be uniformly sprayed out at a high speed and can be uniformly mixed with the hot air.
Thus, the cold air of 20 ℃ is heated to about 200 ℃ by the heat exchanger 300 under the action of the first fan F1, then is fully mixed with the fuel gas entering from the fuel gas cylinder 291 by the hot air delivery pipe L1, and enters the burner 200, and the mixed gas is first subjected to uniform flow by the second annular porous plate 260 and then is uniformly sprayed out at a high speed by the first annular porous plate 250 into the truncated cone-shaped mixing cavity 220. As shown in fig. 3, six circles of first air outlet holes 251 are arranged in parallel on the ring surface of the first annular porous plate 250, and six circles of elliptical first air outlet holes 251 are arranged in a staggered manner, so that tempering can be effectively prevented. And the annular surface of the second annular porous plate 260 is provided with three circles of second air outlet holes 261 in parallel, and the three circles of second air outlet holes 261 with triangular or diamond-shaped holes are arranged in a staggered manner, so that flow equalization can be effectively realized.
On the other hand, the high temperature flue gas of about 400 ℃ accounting for about 20% of the total volume of the flue gas is sucked out by the third fan F3 through the second flue 120, enters the second inlet 202 of the burner 200 through the flue gas conveying pipe L2, enters the second annular space 280 tangentially to form a rotary air flow, is sprayed into the circular truncated cone-shaped mixing cavity 220, is fully mixed with hot air and gas fuel, and is ignited and fed into the furnace body 100.
As another alternative, the fuel gas can be conveyed through the central tube, the rear end of the central tube is closed, a plurality of fuel gas injection holes are formed in the tube wall of the central tube between the first annular porous plate and the second annular porous plate, the fuel gas enters the first annular space through the fuel gas injection holes to be primarily mixed with hot air, and the fuel gas enters the circular truncated cone-shaped mixing cavity through the first annular space after being primarily mixed to be further uniformly mixed with high-temperature flue gas.
As a further alternative, the gas cylinder is connected with the connecting cylinder in a tangential direction to form a swirl flow in the connecting cylinder, which facilitates uniform mixing of the gas and the hot air.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although preferred embodiments of the present invention have been described in detail herein, it is to be understood that the invention is not limited to the precise construction and steps set forth herein, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

1. An energy-saving and environment-friendly combustion system of a flue gas combustion-supporting industrial furnace, comprising: furnace body and with combustor and heat exchanger that the furnace body is connected, its characterized in that:
a first flue is arranged at one side of the rear end of the furnace body;
the burner is arranged at the front end of the furnace body and is communicated with a hearth of the furnace body, and the burner is provided with a first inlet;
the heat exchanger is provided with a high-temperature flue gas inlet, a cold air inlet, a low-temperature flue gas outlet and a hot air outlet, the high-temperature flue gas inlet is connected with the first flue, the low-temperature flue gas outlet is connected with a chimney through a pipeline, the cold air inlet is connected with a first fan, the hot air outlet is connected with the first inlet of the combustor through a hot air conveying pipe, so that hot air formed by heat exchange of cold air introduced into the heat exchanger through the first fan is conveyed into the combustor for combustion supporting;
a second flue is arranged on the other side of the rear end of the furnace body, and the combustor is also provided with a second inlet, wherein the second flue is connected with the second inlet through a flue gas conveying pipe so as to convey part of high-temperature flue gas into the combustor for supporting combustion; and
the burner includes: the device comprises a central tube, an inner cylinder sleeved outside the central tube, an outer cylinder sleeved outside the inner cylinder, and a truncated cone-shaped mixing cavity connected between the outer cylinder and the furnace body, wherein a first inlet is communicated with a first annular space formed between the outer wall of the central tube and the inner wall of the inner cylinder, and a second inlet is communicated with a second annular space formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder.
2. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in claim 1, wherein: the front end of the inner cylinder is closed, and a first annular porous plate which is connected with the inner cylinder and the central tube is arranged in the first annular space and adjacent to the rear port of the inner cylinder; at least five circles of first air outlet holes are formed in the annular surface of the first annular porous plate; the shape of the first air outlet hole is set to be elliptical, and the equivalent diameter is 2-3 mm.
3. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in claim 2, wherein: the front end of the outer cylinder is closed, and a second annular porous plate which is used for connecting the inner cylinder and the central tube is arranged in the first annular space and adjacent to the front end wall of the outer cylinder; at least three circles of second air outlet holes are formed in the annular surface of the second annular porous plate, the shape of each second air outlet hole is set to be triangular or diamond, and the equivalent diameter is 5-8 mm.
4. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in claim 3, wherein: the at least five circles of first air outlet holes are arranged at equal intervals along the radial direction, and each circle of first air outlet holes and the adjacent circle of first air outlet holes are respectively staggered in the radial direction and the circumferential direction; the at least three circles of second air outlet holes are arranged at equal intervals along the radial direction, and each circle of second air outlet holes and the adjacent circle of second air outlet holes are respectively staggered in the radial direction and the circumferential direction.
5. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in any one of claims 1 to 4, wherein: the first inlet is disposed in tangential communication with the first annular space adjacent the forward end wall of the inner barrel and the second inlet is disposed in tangential communication with the second annular space adjacent the forward end wall of the outer barrel.
6. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in claim 5, wherein: an igniter and a flame detector are arranged in the central tube, and the outlet end of the central tube is flush with the outlet ends of the inner cylinder and the outer cylinder.
7. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in claim 5, wherein: the first inlet is connected with the hot air conveying pipe through a connecting cylinder, a gas cylinder for introducing gas fuel into the combustor is arranged on the cylinder wall of the connecting cylinder, a gas distribution plate is arranged in the gas cylinder, and a plurality of gas holes are formed in the gas distribution plate.
8. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in claim 7, wherein: the gas holes are distributed on the gas distribution plate in a triangular shape, the shape of the gas holes is set to be triangular or diamond-shaped, and the equivalent diameter is 1-2 mm.
9. The energy-saving and environment-friendly combustion system for the flue gas-supporting industrial furnace according to any one of claims 1 to 4, wherein the second flue conveys 10 to 40 percent of high-temperature flue gas accounting for the total volume of the flue gas into the burner for supporting combustion.
10. The energy-saving and environment-friendly combustion system of the flue gas combustion-supporting industrial furnace as claimed in any one of claims 1 to 4, wherein: the diameter of the outlet end of the truncated cone-shaped mixing cavity is set to be 35% -75% of the diameter of the inlet end of the truncated cone-shaped mixing cavity, and the outer cylinder, the truncated cone-shaped mixing cavity, the inner cylinder and the central tube are coaxial.
CN201710840051.9A 2017-09-18 2017-09-18 Energy-saving environment-friendly combustion system of smoke combustion-supporting industrial furnace Active CN107677137B (en)

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CN201710840051.9A CN107677137B (en) 2017-09-18 2017-09-18 Energy-saving environment-friendly combustion system of smoke combustion-supporting industrial furnace
PCT/CN2018/106180 WO2019052573A1 (en) 2017-09-18 2018-09-18 Energy-saving and environment-friendly combustion system for flue gas combustion-supporting industrial furnace

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CN201710840051.9A CN107677137B (en) 2017-09-18 2017-09-18 Energy-saving environment-friendly combustion system of smoke combustion-supporting industrial furnace

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CN107677137B true CN107677137B (en) 2024-04-02

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