CN209960492U - Low-nitrogen combustion air duct and combustor - Google Patents
Low-nitrogen combustion air duct and combustor Download PDFInfo
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- CN209960492U CN209960492U CN201920516107.XU CN201920516107U CN209960492U CN 209960492 U CN209960492 U CN 209960492U CN 201920516107 U CN201920516107 U CN 201920516107U CN 209960492 U CN209960492 U CN 209960492U
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Abstract
The utility model belongs to the technical field of the combustor, a low nitrogen burning dryer is related to, including first barrel, the second barrel sets up in first barrel, first reducing barrel, the one end of first reducing barrel and the interior wall connection of first barrel, the other end is connected with the second barrel, the inner wall of first barrel, the outer wall of second barrel and the outer wall of first reducing barrel enclose into first annular chamber, the inner wall of first barrel, the inner wall of second barrel and the inner wall of first reducing barrel enclose into the first passageway that is used for making the natural gas to pass through, first opening sets up on first barrel, communicate with first annular chamber. Still provide a combustor, including foretell low nitrogen burning dryer, still include fan, combustion head and furnace, the one end setting that first barrel is close to the second barrel is in furnace. Through above-mentioned technical scheme, solved among the prior art problem that the interior circulation amount of wind of burning dryer is little, the combustor fault rate is high.
Description
Technical Field
The utility model belongs to the technical field of the combustor, a low-nitrogen combustion dryer and combustor are related to.
Background
In recent years, the economic growth of China is rapid, the energy consumption is remarkably improved, the environmental pollution is intensified, and the atmospheric pollution is more serious, so that the national emission limit requirements of pollutants generated by combustion are higher and higher. Nitrogen oxides are a main atmospheric pollutant and are important factors for triggering acid rain, haze and photochemical smog. Environmental standards in various places of China strictly limit the discharge amount of nitrogen oxides. For this reason, reducing nitrogen oxide emissions is one of the main goals of current combustor designs. The method is characterized in that a hole is formed in the rear of a boiler induced draft fan, a return fan is arranged to extract flue gas generated by combustion and mix the flue gas with air, and then the flue gas is sent into the combustor, the oxygen concentration is diluted after the circulating flue gas is mixed with the air, and the cold air amount is increased under the condition of not increasing the oxygen concentration, so that the flame temperature is favorably reduced, the combustion reaction time is prolonged, the local high temperature of a hearth is avoided, and the generation of nitrogen oxides is effectively inhibited.
The existing burner has the advantages that an air duct and a burning head are simple, the internal circulation air quantity is small, low-nitrogen emission is realized by sucking a large amount of flue gas through external circulation, high load cannot be realized, more condensate water exists, internal parts of a machine are easy to corrode, ignition is difficult, and fire is easy to extinguish midway.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low-nitrogen combustion dryer and combustor has solved among the prior art problem that the interior circulation amount of wind of burning dryer is little, the combustor fault rate is high.
The technical scheme of the utility model is realized like this:
a low-nitrogen combustion air duct comprises a first barrel body,
a second cylinder disposed within the first cylinder,
the first diameter-changing cylinder body is connected with the inner wall of the first cylinder body at one end and connected with the second cylinder body at the other end, a first annular cavity is defined by the inner wall of the first cylinder body, the outer wall of the second cylinder body and the outer wall of the first diameter-changing cylinder body, a first channel for natural gas to pass through is defined by the inner wall of the first cylinder body, the inner wall of the second cylinder body and the inner wall of the first diameter-changing cylinder body,
a first opening disposed on the first barrel in communication with the first annular cavity.
As a further technical scheme, the first openings are uniformly arranged on the first cylinder body along the circumferential direction.
As a further technical scheme, the device also comprises a second opening, wherein the second opening is arranged on the first reducing cylinder body and is communicated with the first annular cavity,
the third cylinder body is arranged on the first diameter-variable cylinder body, the interior of the third cylinder body is communicated with the first annular cavity through the second opening,
a second diameter-changing cylinder body and a third diameter-changing cylinder body are sequentially arranged in the third cylinder body from one end far away from the first diameter-changing cylinder body to one end close to the first diameter-changing cylinder body,
the diameter of the second diameter-changing cylinder body is gradually increased from one end close to the first diameter-changing cylinder body to one end far away from the first diameter-changing cylinder body,
the diameter of the third diameter-changing cylinder body is gradually reduced from one end close to the first diameter-changing cylinder body to one end far away from the first diameter-changing cylinder body,
and the third opening is arranged on the first cylinder and is communicated with the inside of the third cylinder.
As a further technical scheme, the third cylinder body is provided with a plurality of first diameter-variable cylinder bodies which are uniformly arranged along the circumferential direction, and the outer wall of the third cylinder body is tightly attached to the inner wall of the first cylinder body.
As a further technical scheme, a plurality of third openings are uniformly formed in the first cylinder along the circumferential direction.
As a further technical scheme, the second openings are uniformly arranged on the first diameter-variable cylinder body along the circumferential direction.
As a further technical scheme, the variable diameter cylinder further comprises a fourth cylinder body, wherein the fourth cylinder body is arranged on the second variable diameter cylinder body, and the diameter of the fourth cylinder body is the same as that of the small end part of the second variable diameter cylinder body.
The utility model also provides a burner, which comprises the low-nitrogen combustion air duct and a fan, wherein the fan is arranged at one end of the first barrel body, which is far away from the second barrel body,
the combustion head is arranged at one end of the first cylinder body close to the second cylinder body,
and one end of the first cylinder, which is close to the second cylinder, is arranged in the hearth.
The utility model discloses a theory of operation and beneficial effect do:
1. in the utility model, the first channel is formed by the inner wall of the first cylinder, the inner wall of the second cylinder and the inner wall of the first reducing cylinder, the first cylinder is provided with a first opening which is communicated with the first annular cavity, natural gas flows from the first cylinder to the second cylinder through the first reducing cylinder when entering the first channel, the diameter of the first channel is gradually reduced at the first reducing cylinder, the flow rate of the natural gas is increased when passing through the outlet of the second cylinder, so as to form a negative pressure lower than the pressure of a hearth, under the action of the negative pressure, air in the hearth and smoke generated by combustion can flow from the first opening into the first annular cavity to the outlet of the second cylinder and are mixed with the natural gas, because the smoke contains a large amount of carbon dioxide and nitrogen, the oxygen concentration in the mixed gas is diluted after being mixed with the air and the natural gas, the combustion time of the natural gas is prolonged, reduced combustion strength, and simultaneously, the air, the flue gas temperature is low, the combustion temperature of natural gas has effectively been reduced, the production in high temperature region has been avoided, thereby reduce the volume of the nitrogen oxide that the burning produced, the purpose of low nitrogen burning has been realized, direct inner wall through setting up first opening and first barrel on first barrel, the outer wall of second barrel encloses into first annular chamber with the outer wall of first reducing barrel and realizes the flue gas inner loop, reduce extrinsic cycle flue gas suction capacity, make the combustor more steady operation, reduce various troubles, need not increase circulation flue gas pipeline and circulating fan, the design is simple, and is with low costs.
2. The utility model discloses in, through evenly setting up the first opening of a plurality of along circumference on first barrel, increased the volume of flue gas inner loop for more flue gases and air admission mix in the exit of second barrel and natural gas behind the first ring chamber, have further prolonged combustion time, have improved the efficiency of low nitrogen burning.
3. In the utility model, part of the natural gas enters the third cylinder when flowing in the first channel, because the diameter of the second diameter-changing cylinder body is gradually increased from one end close to the first diameter-changing cylinder body to one end far away from the first diameter-changing cylinder body, the flow speed of the natural gas is increased due to the narrowing of the path when the natural gas flows through the second diameter-changing cylinder body, and negative pressure lower than the pressure in the third cylinder body is formed, under the action of negative pressure, more air in the hearth and flue gas generated by combustion are sucked into the third cylinder through the third opening to be mixed with natural gas, therefore, the air in the hearth and the flue gas generated by combustion can enter the first annular cavity through the first opening and then are mixed with natural gas, and the flue gas internal circulation can be realized through the third opening, so that the two-stage internal circulation is used, the flue gas internal circulation amount is increased, the external circulation amount is reduced to zero, and the discharge amount of nitrogen oxides is reduced to be lower than 30 mg/m.3Further improving the low-nitrogen combustion efficiency.
4. The utility model discloses in, through evenly setting up a plurality of third barrel along circumference in first barrel, on the one hand, increased the flue gas inner loop volume to reduced the volume that reduces the nitrogen oxide that the burning produced, on the other hand, make the flue gas that gets into follow inside more even and the natural gas mixture in second barrel exit behind the first chamber of second opening entering of third barrel, further reduced the combustion temperature of natural gas, reached the purpose of low nitrogen burning.
5. The utility model discloses in, through evenly setting up a plurality of third opening along circumference on first barrel, further increased the flue gas inner loop volume for more flue gases and air admission third barrel mix with the natural gas, further diluted the oxygen concentration in the gas mixture, prolonged combustion time, further improved the efficiency of low-nitrogen combustion.
6. The utility model discloses in, through set up a plurality of second opening on first reducing barrel, increased the inside of third barrel and the area of first annular chamber intercommunication for more flue gases and air pass through the first annular chamber of second opening entering in the third barrel, consequently, low nitrogen combustion efficiency is higher.
7. The utility model discloses in, be provided with the fourth barrel on the second reducing barrel for the natural gas continues to flow to first annular chamber through the inside of fourth barrel after the second reducing barrel flows through, plays the guide effect to the natural gas, and on the other hand has increased the suction to external flue gas and air, makes more flue gas and air mix with the natural gas in getting into the third barrel by the third opening, thereby has further increased the inner loop volume, has improved low nitrogen combustion efficiency.
8. The utility model discloses in, the natural gas passes through the fan and carries in to low nitrogen burning dryer, and the air in the exit of second barrel and furnace mixes with the flue gas that the burning produced, and the mist burns at the combustion head, has avoided the direct burning high temperature of natural gas and has produced a large amount of nitrogen oxides and cause air pollution, and increase flue gas inner loop volume makes the combustor more steady operation, reduces various trouble, need not increase circulation flue gas pipeline and circulating fan, and the design is simple reasonable, is fit for using widely.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of an embodiment of the low-nitrogen combustion duct of the present invention;
FIG. 2 is a schematic structural view of another embodiment of the low-nitrogen combustion wind tunnel of the present invention;
FIG. 3 is a schematic view of the burner of the present invention;
in the figure: 1-a first cylinder, 2-a second cylinder, 3-a first diameter-changing cylinder, 4-a first annular cavity, 5-a first channel, 6-a first opening, 7-a second opening, 8-a third cylinder, 9-a second diameter-changing cylinder, 10-a third diameter-changing cylinder, 11-a third opening, 12-a fourth cylinder, 13-a fan, 14-a combustion head and 15-a hearth.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in FIGS. 1-3,
a low-nitrogen combustion air duct comprises a first barrel body 1,
a second cylinder 2, the second cylinder 2 is arranged in the first cylinder 1,
a first diameter-variable cylinder 3, one end of the first diameter-variable cylinder 3 is connected with the inner wall of the first cylinder 1, the other end is connected with the second cylinder 2, the inner wall of the first cylinder 1, the outer wall of the second cylinder 2 and the outer wall of the first diameter-variable cylinder 3 enclose a first annular cavity 4, the inner wall of the first cylinder 1, the inner wall of the second cylinder 2 and the inner wall of the first diameter-variable cylinder 3 enclose a first channel 5 for natural gas to pass through,
a first opening 6, the first opening 6 being provided on the first cylinder 1, communicating with the first annular chamber 4.
In this embodiment, the first channel 5 is defined by the inner wall of the first cylinder 1, the inner wall of the second cylinder 2 and the inner wall of the first diameter-variable cylinder 3, the first opening 6 is arranged on the first cylinder 1, the first opening 6 is communicated with the first annular cavity 4, natural gas enters the first channel 5 and flows from the first cylinder 1 to the second cylinder 2 through the first diameter-variable cylinder 3, because the diameter of the first channel 5 is gradually reduced at the first diameter-variable cylinder 3, the flow rate of the natural gas is increased when the natural gas passes through the outlet of the second cylinder 2, a negative pressure lower than the pressure of the hearth 15 is formed, under the action of the negative pressure, air and flue gas generated by combustion in the hearth 15 can enter the first annular cavity 4 through the first opening 6 to flow to the outlet of the second cylinder 2 to be mixed with the natural gas, because the flue gas contains a large amount of carbon dioxide and nitrogen, and the oxygen concentration in the mixed gas is diluted after being mixed with the air and the natural gas, the burning time of the natural gas has been prolonged, the combustion intensity has been reduced, and simultaneously, air, the flue gas temperature is low, the combustion temperature of the natural gas has effectively been reduced, the production of high-temperature region has been avoided, thereby reduce the volume of the nitrogen oxide that the burning produced, the purpose of low nitrogen burning has been realized, direct inner wall through setting up first opening 6 and first barrel 1 on first barrel 1, the outer wall of second barrel 2 encloses into first annular chamber 4 with the outer wall of first reducing barrel 3 and realizes the flue gas inner loop, reduce extrinsic cycle flue gas suction capacity, make the combustor more steady operation, reduce various troubles, need not increase circulation flue gas pipeline and circulating fan 13, the design is simple, and is low in cost.
Further, there are a plurality of first openings 6, evenly set up on first barrel 1 along circumference.
In this embodiment, through evenly set up the first opening 6 of a plurality of along circumference on first barrel 1, increased the volume of flue gas inner loop for more flue gas and air mix with the natural gas in the exit of second barrel 2 after getting into first annular chamber 4, further prolonged the combustion time, improved the efficiency of low nitrogen burning.
Further comprises a second opening 7, the second opening 7 is arranged on the first diameter-changing cylinder body 3 and is communicated with the first annular cavity 4,
a third cylinder 8, the third cylinder 8 is arranged on the first diameter-changing cylinder 3, the inside of the third cylinder 8 is communicated with the first annular cavity 4 through a second opening 7,
a second diameter-changing cylinder 9 and a third diameter-changing cylinder 10 are sequentially arranged in the third cylinder 8 from one end far away from the first diameter-changing cylinder 3 to one end close to the first diameter-changing cylinder 3,
the diameter of the second reducing cylinder 9 is gradually increased from one end close to the first reducing cylinder 3 to one end far away from the first reducing cylinder 3,
the diameter of the third reducing cylinder 10 is gradually reduced from one end close to the first reducing cylinder 3 to one end far away from the first reducing cylinder 3,
the third opening 11 is provided in the first cylinder 1, and the third opening 11 communicates with the inside of the third cylinder 8.
In this embodiment, part of the natural gas enters the third cylinder 8 when flowing in the first channel 5The diameter of the second diameter-variable cylinder 9 is gradually increased from one end close to the first diameter-variable cylinder 3 to one end far away from the first diameter-variable cylinder 3, when natural gas flows through the second diameter-variable cylinder 9, the path is narrowed, the flow speed is increased, negative pressure lower than the pressure in the third cylinder 8 is formed, under the action of the negative pressure, more air and smoke generated by combustion in the hearth 15 are sucked into the third cylinder 8 through the third opening 11 to be mixed with the natural gas, therefore, the air and the smoke generated by combustion in the hearth 15 can be mixed with the natural gas after entering the first annular cavity 4 through the first opening 6, and smoke internal circulation can be realized through the third opening 11, two-stage internal circulation is used, the smoke internal circulation amount is increased, the external circulation amount is reduced to zero, and the emission of nitrogen oxides is reduced to be lower than 30mg/m3Further improving the low-nitrogen combustion efficiency.
Further, the third cylinder 8 has a plurality of, evenly sets up on first reducing cylinder 3 along circumference, and the inner wall of first cylinder 1 is hugged closely to the outer wall of third cylinder 8.
In this embodiment, through evenly set up a plurality of third barrel 8 along circumference in first barrel 1, on the one hand, flue gas inner loop volume has been increased to reduced the volume of the nitrogen oxide that the burning produced, on the other hand, make the flue gas that gets into follow third barrel 8 inside by second opening 7 get into behind the first chamber more even with the natural gas mixture in the 2 exit of second barrel, further reduced the combustion temperature of natural gas, reached the purpose of low nitrogen burning.
Further, there are a plurality of third openings 11, which are uniformly arranged on the first cylinder 1 along the circumferential direction.
In this embodiment, through evenly set up a plurality of third opening 11 along circumference on first barrel 1, further increased the flue gas inner loop volume for more flue gas and air admission third barrel 8 mix with the natural gas, further diluted the oxygen concentration in the gas mixture, prolonged combustion time, further improved the efficiency of low-nitrogen combustion.
Furthermore, the second opening 7 is provided with a plurality of second openings which are evenly arranged on the first reducing cylinder 3 along the circumferential direction.
In this embodiment, through set up a plurality of second opening 7 on first reducing barrel 3, increased the inside and the area of first annular chamber 4 intercommunication of third barrel 8 for more flue gas and air pass through second opening 7 and get into first annular chamber 4 in the third barrel 8, consequently, low nitrogen combustion efficiency is higher.
Further, the diameter of the fourth cylinder 12 is the same as the diameter of the small end of the second diameter-changing cylinder 9, and the fourth cylinder 12 is arranged on the second diameter-changing cylinder 9.
In this embodiment, the fourth cylinder 12 is arranged on the second diameter-changing cylinder 9, so that the natural gas continuously flows to the first annular cavity 4 through the inside of the fourth cylinder 12 after flowing through the second diameter-changing cylinder 9, and the natural gas is guided, on the other hand, the suction force to the external smoke and air is increased, so that more smoke and air enter the third cylinder 8 through the third opening 11 and are mixed with the natural gas, thereby further increasing the internal circulation amount and improving the low-nitrogen combustion efficiency.
A burner comprises the low-nitrogen combustion air duct and a fan 13, wherein the fan 13 is arranged at one end of the first barrel body 1 far away from the second barrel body 2,
a combustion head 14, wherein the combustion head 14 is arranged at one end of the first cylinder 1 close to the second cylinder 2,
and one end of the first cylinder 1, which is close to the second cylinder 2, is arranged in the hearth 15.
In this embodiment, the natural gas passes through fan 13 and carries in to low-nitrogen combustion dryer, the air in the exit of second barrel 2 and furnace 15 mixes with the flue gas that the burning produced, the mist burns at combustion head 14, avoided the direct burning high temperature of natural gas and produced a large amount of nitrogen oxides and cause air pollution, increase flue gas inner loop volume, make the combustor more steady operation, reduce various troubles, need not increase circulation flue gas pipeline and circulating fan 13, the design is simple reasonable, and is suitable for being generalized to use.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A low-nitrogen combustion air duct is characterized by comprising a first barrel (1),
a second cylinder (2), the second cylinder (2) being arranged in the first cylinder (1),
a first diameter-variable cylinder (3), one end of the first diameter-variable cylinder (3) is connected with the inner wall of the first cylinder (1), the other end is connected with the second cylinder (2), the inner wall of the first cylinder (1), the outer wall of the second cylinder (2) and the outer wall of the first diameter-variable cylinder (3) enclose a first annular cavity (4), the inner wall of the first cylinder (1), the inner wall of the second cylinder (2) and the inner wall of the first diameter-variable cylinder (3) enclose a first channel (5) for natural gas to pass through,
a first opening (6), said first opening (6) being provided on said first cylinder (1) in communication with said first annular chamber (4).
2. A low-nitrogen combustion air duct according to claim 1, characterized in that a plurality of said first openings (6) are uniformly arranged on said first tube (1) along the circumferential direction.
3. The low-nitrogen combustion air duct according to claim 1 or 2, characterized by further comprising
A second opening (7), the second opening (7) is arranged on the first diameter-changing cylinder body (3) and is communicated with the first annular cavity (4),
the third cylinder (8) is arranged on the first variable diameter cylinder (3), the inside of the third cylinder (8) is communicated with the first annular cavity (4) through the second opening (7),
a second diameter-changing cylinder (9) and a third diameter-changing cylinder (10) are sequentially arranged in the third cylinder (8) from one end far away from the first diameter-changing cylinder (3) to one end close to the first diameter-changing cylinder (3),
the diameter of the second diameter-changing cylinder (9) is gradually increased from one end close to the first diameter-changing cylinder (3) to one end far away from the first diameter-changing cylinder (3),
the diameter of the third diameter-changing cylinder (10) is gradually reduced from one end close to the first diameter-changing cylinder (3) to one end far away from the first diameter-changing cylinder (3),
a third opening (11), the third opening (11) is arranged on the first cylinder (1) and communicated with the inside of the third cylinder (8).
4. The low-nitrogen combustion air duct according to claim 3, characterized in that a plurality of third ducts (8) are uniformly arranged on the first diameter-variable duct (3) along the circumferential direction, and the outer wall of the third ducts (8) is tightly attached to the inner wall of the first duct (1).
5. A low-nitrogen combustion air duct according to claim 3, characterized in that a plurality of said third openings (11) are uniformly arranged on said first duct body (1) along the circumferential direction.
6. The low-nitrogen combustion air duct according to claim 3, characterized in that the second openings (7) are uniformly arranged on the first diameter-variable cylinder (3) along the circumferential direction.
7. The low-nitrogen combustion air duct according to claim 3, characterized in that the low-nitrogen combustion air duct further comprises a fourth barrel (12), wherein the fourth barrel (12) is arranged on the second reducing barrel (9) and has the same diameter as the small end of the second reducing barrel (9).
8. A burner, characterized by comprising the low-nitrogen combustion air duct as recited in any one of claims 1 to 7, and further comprising a fan (13), wherein the fan (13) is arranged at one end of the first barrel (1) far away from the second barrel (2),
the combustion head (14) is arranged at one end of the first cylinder (1) close to the second cylinder (2),
and one end of the first cylinder (1) close to the second cylinder (2) is arranged in the hearth (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920516107.XU CN209960492U (en) | 2019-04-17 | 2019-04-17 | Low-nitrogen combustion air duct and combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920516107.XU CN209960492U (en) | 2019-04-17 | 2019-04-17 | Low-nitrogen combustion air duct and combustor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209960492U true CN209960492U (en) | 2020-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920516107.XU Expired - Fee Related CN209960492U (en) | 2019-04-17 | 2019-04-17 | Low-nitrogen combustion air duct and combustor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209960492U (en) |
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2019
- 2019-04-17 CN CN201920516107.XU patent/CN209960492U/en not_active Expired - Fee Related
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Granted publication date: 20200117 Termination date: 20210417 |