A burner

Abstract

The present invention relates to a burner, comprising an ejector (1) and a combustion head (2), characterized in that: the ejector (1) is sleeved in an annular gas distribution pipe (3), the gas distribution pipe (3) is provided with a gas inlet (31) connected to the inner cavity of the gas distribution pipe, and the side wall of the gas distribution pipe is also provided with a plurality of nozzles (32) connected to the inner cavity of the gas distribution pipe; the ejector (1) comprises an air mixing chamber (11) and a plurality of mutually independent ejection channels (12), the inlet of each ejection channel is respectively opposite to each of the nozzles (32) and connected to the surrounding environment, the outlet of each ejection channel is connected to the air mixing chamber (11), and the outlet of the air mixing chamber (11) is connected to the inlet of the combustion head (2).

Description

Technical Field

[0001] The present invention relates to a burner. Background Art

[0002] CN2168182Y discloses a harmonica-type burner, which includes a gas inlet, a distribution chamber, and a burner. The burner is composed of a plurality of long holes connected in an array, and each long hole is separated by two metal sheets. The metal sheets used for separation are stacked in the center to form a larger opening; it is shaped like a harmonica and forms a radial flame. The burner has a high firepower.

[0003] However, the gas and air entering the burner distribution chamber are both cold air, resulting in low combustion efficiency, incomplete combustion, and high pollutant emissions. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a burner which can significantly improve the combustion effect and reduce the emission of pollutants in view of the current status of the prior art, so as to make the gas burn fully and improve the combustion efficiency.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: the burner includes an ejector and a combustion head, and is characterized in that:

[0006] The ejector is sleeved in an annular gas distribution pipe, the gas distribution pipe is provided with a gas inlet connected to the inner cavity of the gas distribution pipe, and a plurality of nozzles connected to the inner cavity of the gas distribution pipe are also spaced apart on the side wall of the gas distribution pipe;

[0007] The ejector includes an air mixing chamber and a plurality of independent ejection channels, the inlet of each ejection channel faces each of the nozzles and is connected to the surrounding environment, the outlet of each ejection channel is connected to the air mixing chamber, and the outlet of the air mixing chamber is connected to the inlet of the combustion head.

[0008] Preferably, the gas distribution pipe is an annular sleeve, and more preferably, it can be a circular ring sleeve, each of the nozzles is arranged on the inner circumferential wall of the annular sleeve, the ejector is arranged in the middle through hole of the replacement sleeve, and there is a gap between the inlet end of each ejection channel on the ejector pipe and the inner circumferential wall of the replacement sleeve.

[0009] The gas inlet of the gas distribution pipe can be arranged on the outer peripheral wall of the sleeve, and a first gas distributor is arranged in the sleeve corresponding to the gas inlet. The arrangement of the first gas distributor can make the gas entering the gas distribution pipe enter each nozzle evenly to avoid short circuit.

[0010] The first gas distributor may have a variety of structures. Preferably, the first gas distributor may be an arc-shaped baffle, which divides part of the cavity in the gas distribution pipe into an inlet channel and a redistribution channel; the gas inlet is connected to the inlet channel. This solution has a simple structure and a good gas redistribution effect.

[0011] Preferably, the length of the baffle is 0.25 to 0.5 times the circumference of the inner cavity of the gas distribution pipe.

[0012] As a further improvement of the above schemes, each of the ejection channels can be connected to the outer wall of the gas mixing chamber and protrude outward from the gas mixing chamber; the outlet of the gas mixing chamber is arranged on the first end surface of the gas mixing chamber. In this way, the gas and air enter the gas mixing chamber after the first premixing in each ejection channel.

[0013] As a further improvement of the above scheme, the cross section of each of the ejection channels first contracts and then expands from the inlet to the outlet; the outlet of each of the ejection channels faces the center of the mixing chamber, and the outlet of the ejection channel is inclined toward the direction of the burner head. The gas mixture has a higher flow rate at the waist position in the middle of the ejection channel, forming a large negative pressure, which is convenient for the air to enter the ejection cavity smoothly. The outlet of each ejection channel is directed to the center of the mixing chamber, so that the airflow in each ejection channel collides with each other after entering the mixing chamber, which greatly increases the gas turbulence and fully ensures the uniformity of the mixing of gas and air; the ejection channel outlet is inclined toward the burner head, which is convenient for guiding the flow toward the burner head.

[0014] Corresponding to the second end face of the gas mixing chamber, a cover plate may be provided on the gas distribution pipe, a gap is provided between the cover plate and the second end face of the gas mixing chamber, and an air inlet communicating with the cavity between the cover plate and the gas mixing chamber is provided on the cover plate. This structure facilitates the connection of a fan, through which air is supplied to the cavity between the cover plate and the gas mixing chamber to control the air intake and ensure the needs of combustion.

[0015] Furthermore, the ejector may further include an inner cylinder arranged outside the gas mixing chamber, a first port of the inner cylinder being sealedly connected to the outlet of the gas mixing chamber, and an end cover plate being arranged on a second port of the inner cylinder;

[0016] The inner cylinder is provided with a plurality of gas outlet holes at intervals on the wall, each of which is connected to the inlet of the burner head. The design of the inner cylinder can guide the heat generated by the combustion of the burner head to form a preheating chamber, preheat the gas mixture entering the inner cylinder, so as to promote the combustion of the gas and improve the combustion efficiency.

[0017] Preferably, the sum of the areas of the air outlet holes is ≤ the cross-sectional area of ​​the inner cylinder to ensure that the flame heights of the various fire holes in the burner head are uniform.

[0018] Preferably, a second gas distributor for uniformly distributing the fuel gas mixture entering the inner cylinder can be provided in the inner cylinder to ensure that the fuel gas mixture in the inner cylinder uniformly enters the fire holes on the burner head.

[0019] In the above schemes, the burner head can be selected from any one of the existing technologies as needed. Preferably, the burner head can be an outer cylinder sleeved outside the inner cylinder; there is a gap between the inner cylinder and the outer cylinder, the first port of the outer cylinder is sealed and connected to the end cover plate, and the second port of the outer cylinder is sealed and connected to the first port of the inner cylinder;

[0020] A plurality of fire holes are arranged at intervals on the wall of the outer cylinder. This structure can improve the combustion stability, has a good flame stabilization effect, and avoids the occurrence of flashback.

[0021] In order to fully meet the preheating requirements of the gas mixture in the inner cylinder, the second gas distributor may include a plurality of radially arranged baffles, the first edges of each of the baffles being connected to the end cover plate; the height of each baffle is less than the height of the inner cylinder. The structural design of the second distributor not only enables the gas mixture in the inner cylinder to enter each fire hole evenly, but also has a turbulent effect, so that the gas mixture entering the inner cylinder is mixed again, further improving the mixing uniformity of the gas and air.

[0022] Preferably, a plurality of redistribution holes are provided on each of the partitions to further increase turbulence and reheat the gas mixture passing through the partitions to further improve the combustion effect.

[0023] Preferably, the inner cylinder, the end cover plate and each of the partitions are made of heat-conducting materials to further meet the heat demand for heating the fuel gas mixture in the inner cylinder.

[0024] Compared with the prior art, the burner provided by the present invention has a multi-injection channel design, which greatly increases the turbulence between gases after the gas mixture enters the mixing chamber, so that the gas and air can be fully mixed, providing conditions for full combustion, significantly improving the combustion effect, increasing combustion efficiency, reducing the content of CO and NOx in the flue gas after combustion, and being environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the assembly structure of an embodiment of the present invention;

[0026] Figure 2 It is a three-dimensional schematic diagram of the exploded structure of an embodiment of the present invention;

[0027] Figure 3 for Figure 1A longitudinal sectional view of the invention; in the figure, hollow arrows represent air, solid arrows represent gas, and arrows with hatching represent gas mixture;

[0028] Figure 4 for Figure 1 Horizontal cross-sectional view. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings.

[0030] like Figures 1 to 4 As shown, the burner comprises:

[0031] The gas distribution pipe 3 is connected to the gas source, and redistributes the gas before sending it into the ejector pipe. It is a sealed annular sleeve, and a plurality of nozzles 32 connected to the inner cavity of the gas distribution pipe are arranged at intervals on the inner circumferential wall of the annular sleeve. A gas inlet 31 connecting the gas source and the inner cavity of the gas distribution pipe is arranged on the outer circumferential wall of the sleeve, and a first gas distributor 33 is arranged in the inner cavity of the sleeve corresponding to the gas inlet 31.

[0032] The first gas distributor 33 is used to redistribute the gas entering the gas distribution pipe to prevent the gas from short-circuiting and directly entering the injection channel near the gas inlet. In principle, the first gas distributor 33 can be selected from any one of the existing technologies as needed. In this embodiment, in order to match the structure of the gas distribution pipe, the first gas distributor 33 is an arc-shaped baffle corresponding to the gas inlet, which divides part of the cavity in the gas distribution pipe into an inlet channel 34 and a redistribution channel 35; the gas inlet 31 is connected to the inlet channel 34; the length of the baffle can be 0.25 to 0.5 times the circumference of the inner cavity of the gas distribution pipe, which is one third in this embodiment.

[0033] The ejector 1 mixes the air and gas entering therein and delivers the gas mixture to the burner head 2; it is arranged in the central through hole of the gas distribution pipe; it includes a mixing chamber 11 and a plurality of independent ejection channels 12, the inlet of each ejection channel is respectively opposite to each of the nozzles 32 and connected to the surrounding environment, and there is a gap between the inlet end of each ejection channel on the ejector pipe and the inner circumferential wall of the replacement sleeve, and the gap forms an air channel; the outlet of each ejection channel is connected to the mixing chamber 11, and the outlet of the mixing chamber 11 is connected to the inlet of the burner head 2.

[0034] In this embodiment, each of the ejector channels 12 is connected to the outer wall of the mixing chamber 11 and protrudes outward from the mixing chamber 11. The cross-sectional area of ​​each ejector channel changes from large to small and then to large from the inlet to the outlet in the axial direction. The middle waist is the smallest cross-sectional area. The flow velocity of the gas flowing through this place increases, forming a large negative pressure, which facilitates the smooth entry of air into the ejector cavity. The outlet of each ejector channel points to the center of the mixing chamber. After the gas mixture from each ejector channel enters the mixing chamber, the air flows collide with each other, greatly increasing the gas turbulence and ensuring the uniformity of the mixing of gas and air. The axial outlet direction of the ejector channel is slightly tilted downward to facilitate the flow into the preheating chamber of the inner cylinder.

[0035] The outlet of the gas mixing chamber is arranged on the first end surface of the gas mixing chamber.

[0036] Corresponding to the second end surface of the mixing chamber 11, a cover plate 36 is provided on the gas distribution pipe, a gap is provided between the cover plate 36 and the second end surface of the mixing chamber, and an air inlet 37 is provided on the cover plate 36 to connect the cavity between the cover plate 36 and the mixing chamber.

[0037] The outlet of the gas mixing chamber is sealed and connected to the first port of the inner cylinder 13. The inner cylinder 13 is located outside the gas mixing chamber. An end cover plate 18 is provided on the second port of the inner cylinder 13. In this embodiment, the cross-sectional area of ​​the gas mixing chamber is slightly larger than the cross-sectional area of ​​the inner cylinder to form a diffusion cavity equivalent to the gas mixing chamber. After the gas mixture enters the gas mixing chamber, the flow velocity decreases sharply, which facilitates the gas mixture to overcome the resistance of the fire hole and smoothly eject and burn.

[0038] The inner cylinder 13 has a plurality of air outlet holes 14 disposed at intervals on its wall, each of which is connected to the inlet of the burner head. The sum of the areas of the air outlet holes 14 is ≤ the cross-sectional area of ​​the inner cylinder to ensure that the flame height along the length direction of the burner head is uniform.

[0039] The inner cylinder 13 is provided with a second gas distributor 15 for uniformly distributing the gas mixture entering the inner cylinder. The function of the second gas distributor is to redistribute the gas mixture entering the inner cylinder so that the gas mixture is uniformly dispersed from each gas outlet. The second gas distributor in this embodiment includes a plurality of radially arranged baffles 16, and a plurality of redistribution holes 17 are provided on the baffles 16; the first edge of each baffle is connected to the end cover plate 18; the height of each baffle 16 is less than the height of the inner cylinder. The inner cylinder 13, the end cover plate 18 and each baffle are made of heat conductive material.

[0040] The second gas distributor in this embodiment not only plays the role of redistributing the gas, but also the design of the partition plate and the redistribution holes thereon can re-mix the gas mixture so that the gas and air are fully mixed.

[0041] The combustion head 2 is an outer cylinder sleeved outside the inner cylinder 13; there is a gap between the inner cylinder and the outer cylinder, the first port of the outer cylinder is sealed connected to the end cover plate 18, and the second port of the outer cylinder is sealed connected to the first port of the inner cylinder; a plurality of fire holes 21 are spaced apart on the wall of the outer cylinder.

[0042] During operation, the gas enters the gas redistribution pipe from the gas inlet. Under the action of the baffle, the gas enters each nozzle evenly and is ejected from the nozzle into each injection channel. The fan sends air from the air inlet into the cavity between the gas redistribution pipe and the ejector. Under the action of the negative pressure generated by the gas injection, the air enters the injection channel together with the gas. The gas and air are premixed in the injection channel and then enter the mixing chamber. In the mixing chamber, the gas mixtures sent from each injection channel collide with each other, and the gas and air are mixed for the second time. The gas mixture after the second mixing enters the inner cylinder from the gas outlet of the mixing chamber.

[0043] The gas mixture entering the inner cylinder first collides with the second gas distributor. The heat generated by the combustion of gas on the outer cylinder is transferred to the second gas distributor through the end cover plate and the inner cylinder to preheat the gas mixture entering the inner cylinder; the preheated gas mixture is evenly dispersed from each gas outlet and enters each fire hole on the outer cylinder for combustion.

[0044] Since the gas mixture enters the fire hole for combustion after being preheated, the combustion efficiency is high, the combustion is complete, there is almost no pollutant emission, and it is environmentally friendly; in addition, the inner cylinder and the outer cylinder are arranged at intervals, the flame stabilization effect is good, and the occurrence of flashback is effectively avoided.

Claims

1. A burner, comprising an ejector (1) and a combustion head (2), characterized in that: The ejector (1) is sleeved in an annular gas distribution pipe (3), the gas distribution pipe (3) is provided with a gas inlet (31) connected to the inner cavity of the gas distribution pipe, and a plurality of nozzles (32) connected to the inner cavity of the gas distribution pipe are also provided at intervals on the side wall of the gas distribution pipe; The ejector (1) comprises an air mixing chamber (11) and a plurality of mutually independent ejection channels (12), the inlet of each ejection channel respectively facing each of the nozzles (32) and connected to the surrounding environment, the outlet of each ejection channel is connected to the air mixing chamber (11), and the outlet of the air mixing chamber (11) is connected to the inlet of the burner head (2); The gas distribution pipe (3) is an annular sleeve, each of the nozzles (32) is arranged on the inner peripheral wall of the annular sleeve, the ejector (1) is arranged in the middle through hole of the replacement sleeve, and there is a gap between the inlet end of each ejection channel of the ejector and the inner peripheral wall of the replacement sleeve; The gas inlet (31) of the gas distribution pipe (3) is arranged on the outer peripheral wall of the casing, and a first gas distributor (33) is arranged in the casing corresponding to the gas inlet (31); The first gas distributor (33) is an arc-shaped baffle, which divides part of the cavity in the gas distribution pipe into an inlet channel (34) and a redistribution channel (35); the gas inlet (31) is connected to the inlet channel (34).

2. The burner according to claim 1, characterized in that The length of the baffle is 0.25 to 0.5 times the circumference of the inner cavity of the gas distribution pipe.

3. The burner according to any one of claims 1 to 2, characterized in that Each of the ejection channels (12) is connected to the outer wall of the gas mixing chamber (11) and protrudes outward from the gas mixing chamber (11); the outlet of the gas mixing chamber is arranged on the first end surface of the gas mixing chamber.

4. The burner according to claim 3, characterized in that The cross section of each of the injection channels first contracts and then expands from the inlet to the outlet; the outlet of each of the injection channels faces the center of the gas mixing chamber (11), and the outlet of the injection channel is inclined toward the combustion head.

5. The burner according to claim 3, characterized in that A cover plate (36) is provided on the gas distribution pipe corresponding to the second end surface of the gas mixing chamber (11), a gap is provided between the cover plate (36) and the second end surface of the gas mixing chamber, and an air inlet (37) is provided on the cover plate (36) for communicating with the cavity between the cover plate (36) and the gas mixing chamber.

6. The burner according to claim 5, characterized in that The ejector further comprises an inner cylinder (13) arranged outside the gas mixing chamber (11), a first port of the inner cylinder (13) being sealingly connected to the outlet of the gas mixing chamber, and an end cover plate (18) being arranged on the second port of the inner cylinder (13); A plurality of air outlet holes (14) are arranged at intervals on the wall of the inner cylinder (13), and each of the air outlet holes (14) is connected to the inlet of the burner head.

7. The burner according to claim 6, characterized in that The sum of the areas of the air outlet holes (14) is less than or equal to the cross-sectional area of ​​the inner cylinder.

8. The burner according to claim 7, characterized in that The inner cylinder (13) is provided with a second gas distributor (15) for uniformly distributing the fuel gas mixture entering the inner cylinder.

9. The burner according to claim 8, characterized in that The burner head is an outer cylinder sleeved outside the inner cylinder (13); there is a gap between the inner cylinder and the outer cylinder, the first port of the outer cylinder is sealedly connected to the end cover plate (18), and the second port of the outer cylinder is sealedly connected to the first port of the inner cylinder; A plurality of fire holes (21) are arranged at intervals on the wall of the outer cylinder.

10. The burner according to claim 9, characterized in that The second gas distributor (15) comprises a plurality of radially arranged partitions (16), wherein a first edge of each partition is connected to the end cover plate (18); and a height of each partition (16) is less than a height of the inner cylinder.

11. The burner according to claim 10, characterized in that Each of the partitions (16) is provided with a plurality of redistribution holes (17).

12. The burner according to claim 11, characterized in that The inner cylinder (13), the end cover plate (18) and each of the partitions (16) are all made of heat-conducting materials.

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