CN216203300U - Flue gas reflux unit and nozzle heating system - Google Patents
Flue gas reflux unit and nozzle heating system Download PDFInfo
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- CN216203300U CN216203300U CN202122712647.5U CN202122712647U CN216203300U CN 216203300 U CN216203300 U CN 216203300U CN 202122712647 U CN202122712647 U CN 202122712647U CN 216203300 U CN216203300 U CN 216203300U
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- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a flue gas reflux device and a burner heating system, wherein the flue gas reflux device comprises a flue gas pipeline, a combustion-supporting air pipeline and an ejector are arranged on the side surface of the flue gas pipeline in a penetrating mode, the ejector comprises a first cavity part and a second cavity part, the first cavity part is arranged at one end of the ejector, the first cavity part is arranged in the flue gas pipeline, the second cavity part is arranged outside the flue gas pipeline, and the end surface of the combustion-supporting air pipeline is arranged in the ejector. The burner heating system comprises a combustion chamber, a burner with a mixed gas inlet and the flue gas reflux device, wherein the outlet of the burner is communicated with the inlet of the combustion chamber, the outlet of the combustion chamber is communicated with a flue gas pipeline, and the gas transmission part of the ejector is communicated with the mixed gas inlet. The utility model is convenient to install, can suck flue gas into the flue gas reflux device through negative pressure, integrates the device into a burner system, can obviously reduce NOx emission of the burner system, and keeps the temperature in a combustion chamber stable.
Description
Technical Field
The utility model relates to the technical field of flue gas backflow, in particular to a flue gas backflow device and a burner heating system.
Background
The flue gas backflow technology is a general technology for reducing NOx emission of a combustion system in the current market, and the most important link of the technology is to mix a part of flue gas into combustion air to dilute the oxygen content in the combustion air, so how to mix a part of flue gas with the combustion air by adopting an efficient and economic method is a key factor influencing the success or failure of a low-nitrogen combustion system. The existing flue gas reflux device mainly depends on the air pressure in a flue gas pipeline to convey flue gas into the flue gas reflux device to be mixed with combustion air, the oxygen concentration of mixed gas is influenced by the air pressure in the flue gas pipeline, the air pressure in the flue gas pipeline is influenced by the temperature in a combustion chamber, when the temperature of the combustion chamber is reduced by reducing the oxygen concentration of the mixed gas, although the discharge amount of NOx can be temporarily reduced, the oxygen concentration in the mixing chamber can also be increased, so that the temperature in the combustion chamber is increased, and the discharge amount of NOx is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a flue gas reflux device and a burner heating system, which are convenient to install, can suck flue gas into the flue gas reflux device through negative pressure, integrate the device into a burner system, can obviously reduce NOx emission of the burner system, and can maintain the temperature in a combustion chamber to be stable.
In order to solve the technical problem, the utility model adopts the following scheme:
the first aspect, flue gas reflux unit, including the flue gas pipeline, flue gas pipeline side runs through being equipped with combustion air pipeline and sprayer, combustion air pipeline and the inside cavity and the central line of sprayer are on same straight line, the sprayer includes first cavity portion and second cavity portion, the one end of sprayer is located to first cavity portion, first cavity portion is located in the flue gas pipeline, second cavity portion is located outside the flue gas pipeline, combustion air pipeline's terminal surface stretches into and locates in the sprayer from the terminal surface of first cavity portion, there is the clearance in combustion air pipeline's outer wall and the inner wall of sprayer. The device has the effects that after combustion-supporting air enters the combustion-supporting air pipeline from the outer end of the combustion-supporting air pipeline, the combustion-supporting air is injected into the ejector at a high speed through the outlet of the combustion-supporting air pipeline in the ejector, meanwhile, negative pressure is formed near the inlet of the ejector in the flue gas pipeline, flue gas in the flue gas pipeline is sucked into the ejector under the action of the negative pressure near the inlet of the ejector, then the flue gas and the combustion-supporting air are mixed in the ejector pipe and then enter the second cavity part of the ejector pipe, the speed is reduced, the pressure is increased, and finally the flue gas enters the burner inlet through the gas transmission part.
Furthermore, the end face of the combustion air pipeline is arranged in the first cavity part.
Further, the cavity of first cavity portion is the stage body form, and first cavity portion includes main aspects and tip, and the main aspects of first cavity portion are towards combustion air pipeline, and the cavity of second cavity portion is the stage body form, and second cavity portion is including main aspects and tip, and the tip of second cavity portion is towards combustion air pipeline.
Furthermore, the air-conveying device also comprises a connecting part, wherein two ends of the cavity inside the connecting part are respectively connected with the small end of the first cavity part and the small end of the second cavity part, and the large end of the second cavity part is connected with the air-conveying part. The gas transmission part is used for transmitting mixed gas.
Furthermore, the end face of the combustion air pipeline is arranged in the connecting part.
The ratio of the minimum distance between one end of the combustion air pipeline in the ejector and the inner wall of the ejector to the inner diameter of the combustion air pipeline is within 1:10-10: 1.
The second aspect, nozzle heating system, including the combustion chamber with be equipped with the nozzle of mist entry, still include foretell flue gas reflux unit, the export of nozzle is linked together with the entry of combustion chamber, the export of combustion chamber is linked together with flue gas pipeline, the gas transmission portion and the mist entry of sprayer are linked together.
The flue gas reflux device comprises a combustion chamber, a flue gas inlet, a flue gas outlet, a combustion air inlet and a combustion air outlet, wherein the flue gas inlet is communicated with the flue gas outlet of the combustion chamber, the flue gas outlet of the combustion chamber is communicated with a flue gas pipeline, and the combustion air outlet of the heat exchanger is communicated with the combustion air pipeline.
Furthermore, the burner is provided with one burner, and the combustion chamber is in a bent pipeline shape.
Furthermore, the burner is provided with at least one burner, and the combustion chamber is a three-dimensional space surrounded by a furnace wall.
The utility model has the following beneficial effects:
1. the suction inlet of one set of ejector is arranged in the flue gas channel, the combustion-supporting air is sprayed into the inlet of the ejector at a high speed, negative pressure is formed at the inlet of the ejector, a part of flue gas is sucked and mixed with the combustion-supporting air, and then the flue gas is fed into the burner to be mixed with fuel and combusted, and due to the dilution effect of the sucked flue gas, the concentration of O2 in the combustion-supporting air entering the burner is reduced, so that the combustion speed of the fuel is delayed, the temperature of a high-temperature area of flame is effectively reduced, and the generation of thermal NOx is effectively inhibited.
2. The flue gas reflux device is convenient to install on site, has wide adaptability, can be used for combustion-supporting air which can be normal-temperature air or preheated air, can be suitable for a radiant tube burner system with indirect heating and is also suitable for an open fire heating system with a single or a plurality of burners.
3. The flue gas concentration that this flue gas reflux unit mixes is weak relevant with the atmospheric pressure in the flue gas pipeline, and is strong relevant with the air velocity in the combustion air pipeline, and the oxygen concentration of mist is stable, enables the NOx that combustion system discharged to maintain at low concentration.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view taken at K-K of the present invention;
FIG. 3 is a schematic diagram of the integration of the present invention on a radiant tube burner system;
FIG. 4 is an integrated schematic of the present invention on an open flame burner system.
The reference numerals are explained below: 1. a flue gas duct; 2. a combustion air conduit; 3. an ejector; 301. a first cavity portion; 302. a connecting portion; 303. a second cavity portion; 304. a gas transmission part; 4. burning a nozzle; 5. a combustion chamber; 6. a heat exchanger; A. a combustion air inlet; B. a combustion air outlet; C. a mixed gas inlet; D. a flue gas outlet; E. gas burning; F. and (3) normal-temperature combustion-supporting air.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to 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.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
On the first hand, as shown in fig. 1 and 2, the flue gas reflux device comprises a flue gas pipeline 1, a combustion-supporting air pipeline 2 and an ejector 3 are arranged on the side surface of the flue gas pipeline 1 in a penetrating mode, the combustion-supporting air pipeline 2 and the ejector 3 are hollow inside and are arranged on the same straight line with the center line, the ejector 3 comprises a first cavity portion 301 and a second cavity portion 303, the first cavity portion 301 is arranged at one end of the ejector 3, the first cavity portion 301 is arranged in the flue gas pipeline 1, the second cavity portion 303 is arranged outside the flue gas pipeline 1, and the end face of the combustion-supporting air pipeline 2 is arranged in the ejector 3. The combustion-supporting air enters the combustion-supporting air pipeline 2 from the outer end of the combustion-supporting air pipeline 2, and then is injected into the ejector 3 at a high speed through the outlet of the combustion-supporting air pipeline 2 in the ejector 3, meanwhile, negative pressure is formed near the inlet of the ejector 3 in the flue gas pipeline 1, flue gas in the flue gas pipeline 1 is sucked into the ejector 3 under the action of the negative pressure near the inlet of the ejector 3, and then is mixed with the combustion-supporting air in the ejector pipe, and then enters the second cavity part 303 of the ejector pipe, so that the speed is reduced, the pressure is increased, and finally the flue gas enters the burner inlet through the gas transmission part 304.
Specifically, as shown in fig. 1 and 2, an end surface of the combustion air duct 2 is provided in the first cavity portion 301.
Specifically, as shown in fig. 1 and 2, the cavity of the first cavity portion 301 is circular truncated cone-shaped, the first cavity portion 301 includes a large end and a small end, the large end of the first cavity portion 301 faces the combustion air duct 2, the cavity of the second cavity portion 303 is circular truncated cone-shaped, the second cavity portion 303 includes a large end and a small end, and the small end of the second cavity portion 303 faces the combustion air duct 2.
Specifically, as shown in fig. 1 and 2, the air-permeable cover further includes a connecting portion 302, two ends of an inner cavity of the connecting portion 302 are respectively connected to a small end of the first cavity portion 301 and a small end of the second cavity portion 303, and a large end of the second cavity portion 303 is connected to an air-permeable portion 304. The connecting portion 302 is used for mixing combustion air and flue gas, and the gas delivery portion 304 is used for delivering the mixed gas.
Specifically, as shown in fig. 1 and 2, an end surface of the combustion air duct 2 is provided in the connection portion 302.
Specifically, as shown in fig. 1 and 2, the ratio of the minimum distance from one end of the combustion air conduit 2 in the ejector 3 to the inner wall of the ejector 3 to the inner diameter of the combustion air conduit 2 is within the range of 1:10-10: 1.
In a second aspect, as shown in fig. 3, the burner heating system includes a combustion chamber 5, a burner 4 provided with a mixed gas inlet C, and the above-mentioned flue gas recirculation apparatus, an outlet of the burner 4 is communicated with an inlet of the combustion chamber 5, an outlet of the combustion chamber 5 is communicated with the flue gas pipeline 1, and a gas transmission portion 304 of the injector 3 is communicated with the mixed gas inlet C.
Specifically, as shown in fig. 3, the flue gas recirculation device further comprises a heat exchanger 6, wherein the heat exchanger 6 is arranged between the combustion chamber 5 and the flue gas recirculation device, the heat exchanger 6 is provided with a flue gas inlet, a flue gas outlet D, a combustion air inlet a and a combustion air outlet B, the outlet of the combustion chamber 5 is communicated with the flue gas inlet of the heat exchanger 6, the flue gas outlet D of the heat exchanger 6 is communicated with the flue gas pipeline 1, and the combustion air outlet B of the heat exchanger 6 is communicated with the combustion air pipeline 2.
Specifically, as shown in fig. 3, one burner 4 is provided, and the combustion chamber 5 is in a curved pipe shape.
The specific working principle of this embodiment is as follows: waste gas generated by combustion of the burner 4 enters a combustion chamber 5, after a large part of heat is released through the surface of the combustion chamber 5, the combustion waste gas at a certain temperature enters a heat exchanger 6, the temperature of the combustion waste gas is reduced after the combustion waste gas exchanges heat with combustion air in the heat exchanger 6, the combustion waste gas is discharged from a flue gas outlet D of the heat exchanger 6 and enters a flue gas pipeline 1 of a flue gas reflux device, and then the flue gas is discharged into a workshop flue; after the normal-temperature combustion air F blown from the combustion air inlet A of the heat exchanger 6 exchanges heat with combustion waste gas in the heat exchanger 6, the temperature is raised, the normal-temperature combustion air F is discharged from the combustion air outlet B of the heat exchanger 6, then enters the flue gas reflux device from the inlet of the combustion air pipeline 2 of the flue gas reflux device, when the preheated combustion air passes through the flue gas reflux device, partial combustion waste gas is sucked in an entrainment mode, is uniformly mixed and then is discharged from the outlet of the ejector 3 of the flue gas reflux device, then is connected to the mixed gas inlet C of the burner nozzle 4, the combustion air diluted by the combustion waste gas is mixed with the fuel gas E in the burner nozzle 4 and is combusted in the combustion chamber 5, high-temperature combustion waste gas is formed, and heat is released through the surface of the combustion chamber 5. If the other end of the combustion chamber 5 is not provided with the heat exchanger 6, the flue gas reflux device 6 can be directly arranged at a hot flue gas outlet of the combustion chamber 5, and then normal-temperature combustion air F is directly connected to an inlet of a combustion air pipeline 2 of the flue gas reflux device.
Example 2
In a first aspect, the flue gas recirculation apparatus of the present embodiment is identical to that of embodiment 1.
In a second aspect, as shown in fig. 4, the burner heating system includes a combustion chamber 5, a burner 4 provided with a mixed gas inlet C, and the above-mentioned flue gas recirculation apparatus, an outlet of the burner 4 is communicated with an inlet of the combustion chamber 5, an outlet of the combustion chamber 5 is communicated with the flue gas pipeline 1, and a gas transmission portion 304 of the injector 3 is communicated with the mixed gas inlet C.
Specifically, as shown in fig. 3, the flue gas recirculation device further comprises a heat exchanger 6, wherein the heat exchanger 6 is arranged between the combustion chamber 5 and the flue gas recirculation device, the heat exchanger 6 is provided with a flue gas inlet, a flue gas outlet D, a combustion air inlet a and a combustion air outlet B, the outlet of the combustion chamber 5 is communicated with the flue gas inlet of the heat exchanger 6, the flue gas outlet D of the heat exchanger 6 is communicated with the flue gas pipeline 1, and the combustion air outlet B of the heat exchanger 6 is communicated with the combustion air pipeline 2.
Specifically, as shown in fig. 4, at least one burner 4 is provided, and the combustion chamber 5 is a three-dimensional space surrounded by a furnace wall.
The specific working principle of this embodiment is as follows: the single or a plurality of burners 4 are arranged in a combustion chamber 5 for combustion, the final combustion waste gas is discharged through a centralized combustion chamber exhaust pipe, then enters a heat exchanger 6 for heat exchange with combustion-supporting air F, the temperature is reduced, the combustion-supporting air F passes through a flue gas pipe 1 of a flue gas reflux device and then is discharged into the atmosphere from a chimney, meanwhile, after the normal temperature combustion-supporting air F passes through the heat exchanger 6 for heat exchange with the high temperature combustion waste gas, the temperature is increased, then the combustion-supporting air F is connected to an inlet of a combustion-supporting air pipe 2 on the flue gas reflux device, when the preheated combustion-supporting air passes through the flue gas reflux device, a part of the combustion waste gas is sucked in a winding mode and uniformly mixed, then the combustion-supporting air is discharged from an outlet of an ejector 3 of the flue gas reflux device, then the combustion-supporting air is connected to a mixed gas inlet C of the burner 4, and the combustion-supporting air diluted by the combustion waste gas is mixed with the gas E in the burner 4 and is combusted in the combustion chamber. If the smoke exhaust pipeline is not provided with the heat exchanger 6, the outlet of the smoke exhaust pipeline of the combustion chamber is directly connected to the inlet of the smoke pipeline 1 of the smoke reflux device, and meanwhile, the normal-temperature combustion air F is directly connected to the inlet of the combustion air pipeline 2 of the smoke reflux device.
The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.
Claims (10)
1. Flue gas reflux unit, including flue gas pipeline (1), its characterized in that: the utility model discloses a flue gas pipeline, including flue gas pipeline (1), combustion-supporting air pipe way (2) and sprayer (3), the inside cavity and the central line of combustion-supporting air pipe way (2) and sprayer (3) are on same straight line, sprayer (3) are including first cavity portion (301) and second cavity portion (303), the one end of sprayer (3) is located in first cavity portion (301), flue gas pipeline (1) is located in second cavity portion (303), the terminal surface of combustion-supporting air pipe way (2) stretches into and locates in sprayer (3) from the terminal surface of first cavity portion (301), there is the clearance in the outer wall of combustion-supporting air pipe way (2) and the inner wall of sprayer (3).
2. The flue gas recirculation apparatus according to claim 1, wherein: the end surface of the combustion air pipeline (2) is arranged in the first cavity part (301).
3. The flue gas recirculation apparatus according to claim 1, wherein: the cavity of first cavity portion (301) is the stage body form, and first cavity portion (301) is including big end and tip, and the big end of first cavity portion (301) is towards combustion air pipeline (2), and the cavity of second cavity portion (303) is the stage body form, and second cavity portion (303) is including big end and tip, and the tip of second cavity portion (303) is towards combustion air pipeline (2).
4. The flue gas recirculation apparatus according to claim 3, wherein: the gas transmission device is characterized by further comprising a connecting part (302), two ends of a cavity in the connecting part (302) are respectively connected with the small end of the first cavity part (301) and the small end of the second cavity part (303), and the large end of the second cavity part (303) is connected with a gas transmission part (304).
5. The flue gas recirculation apparatus according to claim 4, wherein: the end face of the combustion air pipeline (2) is arranged in the connecting part (302).
6. The flue gas recirculation apparatus according to claim 1, wherein: the proportion range of the minimum distance between one end of the combustion air pipeline (2) in the ejector (3) and the inner wall of the ejector (3) to the inner diameter of the combustion air pipeline (2) is within 1:10-10: 1.
7. Nozzle heating system includes combustion chamber (5) and is equipped with nozzle (4) of mist entry (C), its characterized in that: the flue gas recirculation device of any one of claims 1 to 6, wherein the outlet of the burner (4) is communicated with the inlet of the combustion chamber (5), the outlet of the combustion chamber (5) is communicated with the flue gas pipeline (1), and the gas transmission part (304) of the ejector (3) is communicated with the mixed gas inlet (C).
8. The burner heating system of claim 7, wherein: the flue gas reflux device is characterized by further comprising a heat exchanger (6), wherein the heat exchanger (6) is arranged between the combustion chamber (5) and the flue gas reflux device according to any one of claims 1 to 6, the heat exchanger (6) is provided with a flue gas inlet, a flue gas outlet (D), a combustion air inlet (A) and a combustion air outlet (B), the outlet of the combustion chamber (5) is communicated with the flue gas inlet of the heat exchanger (6), the flue gas outlet (D) of the heat exchanger (6) is communicated with the flue gas pipeline (1), and the combustion air outlet (B) of the heat exchanger (6) is communicated with the combustion air pipeline (2).
9. The burner heating system of claim 7, wherein: the burner (4) is provided with one burner, and the combustion chamber (5) is in a bent pipeline shape.
10. The burner heating system of claim 7, wherein: the burner (4) is provided with at least one burner, and the combustion chamber (5) is a three-dimensional space surrounded by a furnace wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122712647.5U CN216203300U (en) | 2021-11-08 | 2021-11-08 | Flue gas reflux unit and nozzle heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122712647.5U CN216203300U (en) | 2021-11-08 | 2021-11-08 | Flue gas reflux unit and nozzle heating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216203300U true CN216203300U (en) | 2022-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122712647.5U Active CN216203300U (en) | 2021-11-08 | 2021-11-08 | Flue gas reflux unit and nozzle heating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216203300U (en) |
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2021
- 2021-11-08 CN CN202122712647.5U patent/CN216203300U/en active Active
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