CN209801477U - Inner axial water-cooling premixing combustion device - Google Patents
Inner axial water-cooling premixing combustion device Download PDFInfo
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- CN209801477U CN209801477U CN201920073331.6U CN201920073331U CN209801477U CN 209801477 U CN209801477 U CN 209801477U CN 201920073331 U CN201920073331 U CN 201920073331U CN 209801477 U CN209801477 U CN 209801477U
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Abstract
The utility model relates to a combustion apparatus, especially an interior axial water-cooling mixes burner in advance, including the combustion chamber, be equipped with the cooling tube in the combustion chamber, the cooling tube is arranged into circularly around the axis of combustion chamber, the combustion chamber includes the gas chamber, the combustion chamber, form the gas chamber between combustion chamber inner wall and the cooling tube, the regional combustion chamber that the cooling tube encloses into, the mist flows to the combustion chamber by the gas chamber, the mist burns at the combustion intracavity and forms annular flame, flame is radial inward, and form annular flame in the combustion chamber through the mist towards the burning of axle center, flame is radial inward, and burn towards the axle center, make the burning concentrate more, the fuel burning is more complete, through the flame radial burning, can shorten the axial propagation length of flame, consequently, can reduce the combustion chamber volume, further reduce the whole volume of boiler, the security performance of boiler is improved, the boiler structure is simplified.
Description
Technical Field
the utility model relates to a burner, especially an interior axial water-cooling mixes burner in advance belongs to boiler combustor technical field.
Background
The gas heating boiler is more and more popular and widely applied to the heating industry because of the advantages of energy conservation, environmental protection, high automation degree, convenient combustion adjustment, high heating speed, high thermal efficiency and the like. Because the fuel used by the boiler is inflammable and explosive gas, the combustion device of the gas plays an important role in the safe operation of the boiler.
Air required by combustion of a traditional combustor is conveyed by an air blower and is divided into primary air and secondary air. The primary air forms a plurality of strands after passing through the front air box of the burner, and forms mixed gas with a plurality of strands of fuel gas sprayed from the gas ring spray holes of the burner. The gas is sprayed out from the spray holes in the radial direction of the boiler, the primary air is sprayed out in the axial direction of the boiler, and the two gases are vertically mixed. The primary air can strongly disturb the fuel gas, the flow direction of the fuel gas is forced to bend from the radial direction to the axial direction, and the mixed gas is uniformly diffused to the periphery of the hearth through a flame stabilizing disc of the combustor. The secondary air is uniformly diffused to the periphery of the hearth by the diffuser.
after the mixed gas enters the boiler furnace, the mixed gas is sprayed along the axial direction of the furnace, the combustion flame is combusted along the axial direction of the furnace, the diameter of the combustion flame is large, and the length of the combustion flame is long. Whereas traditional boilers require a furnace diameter greater than the flame diameter and a furnace length greater than the flame length. Therefore, aiming at the structure of the traditional burner, a large-size hearth needs to be configured, the structure is complex, the cost is higher, and the safety performance of the boiler is reduced. In addition, the mixed gas sprayed by the traditional burner is easy to produce incomplete combustion due to long combustion flame, produces more CO and NOx, is not beneficial to the full utilization of boiler fuel and is difficult to reach the low-nitrogen emission standard of the boiler.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an interior axial water-cooling mixes burner in advance in order to solve among the prior art boiler furnace volume great and fuel because of can not the abundant burning and produce more NOx's problem.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
the utility model provides an interior axial water-cooling mixes burner in advance, includes the combustion chamber, is equipped with the cooling tube in the combustion chamber, and the cooling tube is arranged into circularly around the axis of combustion chamber, and the combustion chamber includes gas chamber, combustion chamber, forms the gas chamber between combustion chamber inner wall and the cooling tube, and the regional combustion chamber that forms that the cooling tube encloses, and the mist flows to combustion chamber by the gas chamber, and the mist burns at the combustion intracavity and forms annular flame, and flame is along radial inside to towards the burning of axle center.
Further, the flue gas in the combustion chamber propagates along the axial direction of the combustion chamber, and the propagation direction of the flue gas is perpendicular to the combustion direction of the flame.
furthermore, one end of the combustion chamber is provided with a first water collecting chamber, and the other end of the combustion chamber is provided with a second water collecting chamber.
Further, one end of the cooling pipe is located in the first water collecting chamber, and the other end of the cooling pipe is located in the second water collecting chamber.
Furthermore, the first water collecting chamber is provided with a cooling water inlet, and the second water collecting chamber is provided with a cooling water outlet.
Further, the middle of the first water collecting chamber is hollow, and/or the middle of the second water collecting chamber is hollow, so that a smoke outlet is formed.
Furthermore, the side wall of the combustion chamber is provided with one or more gas inlets, and the gas inlets are positioned on the same plane and uniformly distributed on the side wall of the combustion chamber.
Furthermore, the mixed gas is premixed gas, and the gas and the air are mixed to be matched and then are introduced into the gas inlet.
Furthermore, a flame stabilizing pipe is arranged in the combustion chamber, the flame stabilizing pipe is arranged into a circle around the axis of the combustion chamber, one end of the flame stabilizing pipe is positioned in the first water collecting chamber, and the other end of the flame stabilizing pipe is positioned in the second water collecting chamber.
Furthermore, the cooling pipe is in a trapezoid shape, and the upper bottom surface and the lower bottom surface of the trapezoid form an arc body; the flame stabilizing pipe is cylindrical.
Further, a first gap is formed between the cooling pipes, a second gap is formed between the flame stabilizing pipes, and the centers of the flame stabilizing pipes are aligned with the adjacent first gaps.
Compared with the prior art, the utility model discloses following beneficial effect has:
Firstly, annular flame is formed in a combustion chamber through mixed gas, the flame is inward along the radial direction and burns towards the axis, so that the combustion is more concentrated, and the fuel is more completely burnt;
The axial propagation length of the flame can be shortened through the radial combustion of the flame, so that the volume of a combustion chamber can be reduced, the overall volume of the boiler is further reduced, the safety performance of the boiler is improved, and the structure of the boiler is simplified;
Thirdly, the gas and the air are mixed to form premixed gas with required proportion, so that the thermal NOx can be effectively reduced, and meanwhile, the combustion flame is short, the combustion is stable, and the heat transfer efficiency is high;
and fourthly, arranging a cooling pipe in the combustion chamber, so that the combustion flame generated by the premixed gas firstly exchanges heat with the cooling medium in the cooling pipe, the temperature of the combustion flame is reduced, and the generation of NOx is inhibited.
drawings
FIG. 1 is a vertical internal structure view of an axial water-cooled premixed burner in an embodiment of the present invention;
FIG. 2 is a plan view of the inner structure of the axial water-cooled premixed burner of the embodiment of the present invention;
FIG. 3 is a structural diagram of an axial water-cooled premixed burner in an embodiment of the present invention;
FIG. 4 is a side view of an axial water-cooled premixed combustion apparatus according to an embodiment of the present invention;
FIG. 5 is a front view of an axial water-cooled premixed burner according to an embodiment of the present invention;
Fig. 6 is a top view of the axial water-cooling premixed combustion apparatus according to the embodiment of the present invention.
In the figure: 1-combustion chamber, 11-gas chamber, 12-combustion chamber, 2-cooling pipe, 3-first water collecting chamber, 4-second water collecting chamber, 5-cooling water inlet, 6-cooling water outlet, 7-flue gas outlet, 8-gas inlet and 9-flame stabilizing pipe.
Detailed Description
The technical solution of the present invention is further described and illustrated by the following specific embodiments.
Referring to fig. 1-6, the present embodiment provides an inner axial water-cooled premixed combustion apparatus, which includes a combustion chamber 1, wherein a cooling pipe 2 is disposed in the combustion chamber 1, and the cooling pipe 2 is arranged in a circle around an axis of the combustion chamber 1. The combustion chamber 1 comprises a gas cavity 11 and a combustion cavity 12. A gas cavity 11 is formed between the inner wall of the combustion chamber 1 and the cooling pipe 2, a combustion cavity 12 is formed in the area surrounded by the cooling pipe 2, and the mixed gas flows to the combustion cavity 12 from the gas cavity 11. The mixture is combusted in the combustion chamber 12 to form an annular flame which is directed radially inwardly and towards the axial center.
the cooling pipe 2 is filled with cooling water, the mixed gas is burned outside the cooling pipe 2, and the burned flame exchanges heat with the cooling water inside the cooling pipe 2, thereby lowering the temperature of the burned flame and further suppressing the generation of NOx. The cooling pipe 2 is arranged in a circular shape around the axis of the combustion chamber 1, and the cooling pipe 2 divides the entire combustion chamber 1 into a gas chamber 11 and a combustion chamber 12, and preferably, the combustion chamber 1 has a cylindrical shape and the gas chamber 11 has an annular shape. When the combustion airflow flows out from the gap between the cooling pipes 2, a circumferential combustion flame can be formed. The combustion direction of the flame is the same as the flow direction of the mixed gas flow, and the flame is inwards along the radial direction and faces the axis of the combustion chamber 1, so that the combustion is centralized, and the fuel is completely combusted. The annular flame is intensively combusted radially inward, the propagation length of the flame in the axial direction is reduced, and therefore the volume of the combustion chamber 1 can be reduced. Use the burner of this embodiment on the boiler, can reduce the whole volume of boiler, improve boiler security performance, simplify traditional boiler structure.
The flue gas generated by the mixed gas flows out from the upper end part and/or the lower end part of the combustion chamber 12 or flows out from the side surface of the combustion chamber 1. Preferably, the flue gas propagates in the axial direction of the combustion chamber 1, perpendicularly to the direction of combustion of the flame, and exits from the upper end of the combustion chamber 12. The high temperature flue gas is used for heating hot water in the boiler after flowing out from the combustion chamber 1.
One end of the combustion chamber 1 is provided with a first water collecting chamber 3, the other end is provided with a second water collecting chamber 4, and the first water collecting chamber 3 and the second water collecting chamber 4 are filled with cooling water. Preferably, the first and second water collection chambers 3 and 4 are annular. One end of the cooling pipe 2 is positioned in the first water collecting chamber 3, the other end is positioned in the second water collecting chamber 4, and the cooling pipe 2 is filled with cooling water. The first water collecting chamber 3 is provided with a cooling water inlet 5, and the second water collecting chamber 4 is provided with a cooling water outlet 6. Driven by a circulating water pump arranged outside the combustion chamber 1, water in the cooling pipe 2 is always in a flowing state, and the flowing cooling water takes away heat of flame outside the cooling pipe 2 in time, so that the combustion temperature of the flame is reduced. Preferably, the first collecting chamber 3 is hollow in the middle and/or the second collecting chamber 4 is hollow in the middle forming a flue gas outlet 7. The position of the flue gas outlet 7 can also be arranged on the side of the combustion chamber 1, and the specific position is selected according to actual conditions.
the side wall of the combustion chamber 1 is provided with one or more gas inlets 8, and the mixed gas enters a gas cavity 11 in the combustion chamber 1 through the gas inlets 8. Preferably, the gas inlet 8 is provided in plurality. The gas inlets 8 are required to be located on the same plane and uniformly distributed on the side wall of the combustion chamber 1, so that the uniform distribution of the mixed gas in the gas cavity 11 is ensured, and the consistency of the mixed gas in the combustion cavity 12 in the combustion time and the integrity of the combustion flame are ensured.
In the embodiment, the mixed gas is premixed gas, the gas and the air are mixed to be matched and then are introduced into the gas inlet 8, the premixed gas can effectively reduce thermal NOx by combustion, and meanwhile, the premixed gas is short in combustion flame, stable in combustion and high in heat transfer efficiency. In addition to that, NOXThe generation of the premixed gas has a great relationship with the flame temperature when the premixed gas is combusted, the premixed gas is combusted on the outer surface of the cooling pipe 2 by arranging the cooling pipe 2 in the combustion chamber 1, the cooling water is fully filled in the cooling pipe 2, and the combustion flame and the cooling water exchange heat, so that the flame temperature of the premixed gas combustion is reduced, and further the generation of NOx is inhibited. The combustion chamber 12 is also provided with flame stabilizing pipes 9, and the flame stabilizing pipes 9 are arranged in a circle around the axis of the combustion chamber 1. One end of the flame stabilizing pipe 9 is positioned in the first water collecting chamber 3, the other end is positioned in the second water collecting chamber 4, and when flame enters the outer surface of the flame stabilizing pipe 9, the flame and the flamethe cooling water in the flame stabilizing pipe 9 exchanges heat, and the combustion temperature of the flame is further reduced.
The cooling pipes 2 form a gap of a certain length therebetween. Preferably, the cooling pipes 2 are trapezoidal, the upper bottom surface and the lower bottom surface of the trapezoidal form an arc body, the arc length of the arc body of the upper bottom surface is smaller than that of the arc body of the lower bottom surface, the arc body of the upper bottom surface is closer to the center of the combustion chamber 1, and the gaps between the cooling pipes 2 are ensured to be equal in width. Preferably, the flame holder tube 9 is cylindrical in shape. The gap formed between the cooling tubes 2 is a first gap, and the flame holding tubes 9 are formed with a second gap therebetween, and preferably, the first gap is aligned with the adjacent first gap with the center of the flame holding tubes 9.
The pressure formed when the combustion gas flows out from the first slit is P1, and the gas flows out from the first slit, is blocked by the flame holding tube 9, and is divided into the second slits on both sides of the flame holding tube 9. After flowing out of the second gap, the pressure is P2, P2 is less than P1, namely, the side of the flame-stabilizing tube 9 where the airflow flows out forms negative pressure, and unburned gas can be re-burned. The flame holding tube 9 in the burner 1 thus has the effect of stabilizing the combustion. The combustion gas forms an integral flame after passing through the first gap and the second gap.
The embodiments of the present invention have been described in detail, and those skilled in the art can easily understand that there are various changes in the embodiments according to the idea of the present invention, and such changes should be considered as the protection scope of the present invention.
Claims (10)
1. The utility model provides an interior axial water-cooling premix burner, includes combustion chamber (1), its characterized in that:
A cooling pipe (2) is arranged in the combustion chamber (1), and the cooling pipe (2) is arranged into a circle around the axis of the combustion chamber (1);
The combustion chamber (1) comprises a gas cavity (11) and a combustion cavity (12); a gas cavity (11) is formed between the inner wall of the combustion chamber (1) and the cooling pipe (2), a combustion cavity (12) is formed in the area surrounded by the cooling pipe (2), and the mixed gas flows to the combustion cavity (12) from the gas cavity (11);
The mixture is combusted in the combustion chamber (12) to form an annular flame which is directed radially inwardly and towards the axial center.
2. the internal axial water-cooled premixed combustion device according to claim 1, characterized in that:
The flue gas in the combustion cavity (12) is propagated along the axial direction of the combustion chamber (1), and the propagation direction of the flue gas is vertical to the combustion direction of the flame.
3. the internal axial water-cooled premixed combustion device as claimed in claim 2, wherein:
One end of the combustion chamber (1) is provided with a first water collecting chamber (3), and the other end is provided with a second water collecting chamber (4); one end of the cooling pipe (2) is positioned in the first water collecting chamber (3), and the other end is positioned in the second water collecting chamber (4).
4. The internal axial water-cooled premixed combustion device according to claim 3, characterized in that:
The first water collecting chamber (3) is provided with a cooling water inlet (5), and the second water collecting chamber (4) is provided with a cooling water outlet (6).
5. The internal axial water-cooled premixed combustion device according to claim 4, characterized in that:
The middle of the first water collecting chamber (3) is hollow and/or the middle of the second water collecting chamber (4) is hollow to form a smoke outlet (7).
6. the internal axial water-cooled premixed combustion device according to claim 3, characterized in that: one or more gas inlets (8) are formed in the side wall of the combustion chamber (1); the gas inlets (8) are positioned on the same plane and are uniformly distributed on the side wall of the combustion chamber (1).
7. The internal axial water-cooled premixed combustion device according to claim 1, characterized in that: the mixed gas is premixed gas, and the gas and the air are mixed to be matched and then are introduced into the gas inlet (8).
8. The internal axial water-cooled premixed combustion device according to claim 1, characterized in that: a flame stabilizing pipe (9) is also arranged in the combustion cavity (12), and the flame stabilizing pipes (9) are arranged into a circle around the axis of the combustion chamber (1); one end of the flame stabilizing pipe (9) is positioned in the first water collecting chamber (3), and the other end is positioned in the second water collecting chamber (4).
9. the internal axial water-cooled premixed combustion device according to claim 8, characterized in that: the cooling pipe (2) is in a trapezoid shape, and the upper bottom surface and the lower bottom surface of the trapezoid form an arc body; the flame stabilizing pipe (9) is cylindrical in shape.
10. The internal axial water-cooled premixed combustion device according to claim 9, characterized in that: first gaps are formed among the cooling pipes (2), second gaps are formed among the flame stabilizing pipes (9), and the centers of the flame stabilizing pipes (9) are aligned with the adjacent first gaps.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920073331.6U CN209801477U (en) | 2019-01-16 | 2019-01-16 | Inner axial water-cooling premixing combustion device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920073331.6U CN209801477U (en) | 2019-01-16 | 2019-01-16 | Inner axial water-cooling premixing combustion device |
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| CN209801477U true CN209801477U (en) | 2019-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109654491A (en) * | 2019-01-16 | 2019-04-19 | 浙江力巨热能设备有限公司 | A kind of interior axial water-cooled premixing combustion apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109654491A (en) * | 2019-01-16 | 2019-04-19 | 浙江力巨热能设备有限公司 | A kind of interior axial water-cooled premixing combustion apparatus |
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