Gas burner

Abstract

The invention relates to the technical field of gas burners, and particularly discloses a gas burner which comprises a burner body provided with an air cavity and a gas cavity and further comprises at least two burning head modules, each burning head module comprises an air pipe and a first gas pipe, one end of each first gas pipe is provided with a connector, and the other end of each first gas pipe is provided with a second gas pipe. A guide pipe is fixedly arranged on the connector, a gas connecting channel communicated with the first gas pipe is arranged on the connector, and at least two gas outlet pipes communicated with the gas connecting channel are fixedly arranged on the connector; according to the gas burner, the structure of the multiple burning head modules is adopted, each burning head module adopts the structure of the multiple second gas pipes, gas can be evenly dispersed, the gas burning sufficiency is improved, in addition, the burning temperature is also evenly dispersed, the burning temperature is constant, the situation that the local temperature is high is avoided, and the service life of the gas burner is prolonged. And the generation of nitrogen oxides is effectively reduced, so that the emission of the nitrogen oxides is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas burners, and particularly to a gas burner. Background Art

[0002] A burner is a device that converts substances into heat energy through the chemical reaction of combustion, that is, air and fuel are sent into the furnace according to the required concentration, speed, turbulence degree and mixing method, and the fuel can be stably ignited and burned in the furnace. Burners are classified into industrial burners, combustion machines, domestic burners, and special burners according to types and application fields, and are mostly made of corrosion-resistant and high-temperature-resistant materials such as stainless steel or titanium metal; as the name implies, a gas burner refers to a burner with gas as the fuel. At present, using a burner as the heat source of a boiler is a common means.

[0003] In a Chinese patent document with the publication number CN107543160B, a low-nitrogen gas burner is disclosed, which includes an ejector nozzle, an air ejector, a combustion-supporting air passage, a jet nozzle device, a mixing swirl device, an oxygen-enriched combustion head, and a reducing combustion head. The ejector nozzle is arranged at the center of the air ejector, the air ejector is arranged in the combustion-supporting air passage, and the front part passes through the oxygen-enriched combustion head and is connected to the reducing combustion head. The jet nozzle device is arranged outside the air ejector in the combustion-supporting air passage and is concentric with the air ejector. The mixing swirl device is sleeved on the jet nozzle device and is concentric with the jet nozzle device. The mixing swirl device can axially move on the jet nozzle device. The oxygen-enriched combustion head and the reducing combustion head adopt a cylindrical structure and are concentrically arranged. The oxygen-enriched combustion head and the reducing combustion head together form the combustion head of the low-nitrogen gas burner. While not increasing the excess air coefficient and not reducing the boiler efficiency, low-nitrogen emissions are achieved.

[0004] However, in the above technology, the gas release is too concentrated, the mixing area of the combustion-supporting air overlaps with the combustion area, and instantaneous nitrogen oxides are easily generated. In addition, the central flame temperature is too high, the temperature distribution is uneven, and the local high temperature easily makes the temperature of the central recirculating flue gas too high, resulting in the production of nitrogen oxides, and the temperature of the central recirculating flue gas and the thermal nitrogen oxides of the central flame cannot be effectively reduced. Summary of the Invention

[0005] The present invention provides a gas burner, aiming to solve the problems in the related technology that the gas release is too concentrated, the mixing area with the combustion-supporting air overlaps with the combustion area, and the temperature distribution in the combustion area is uneven, and nitrogen oxides are easily generated.

[0006] The gas burner of the present invention includes a burner main body, the burner main body is provided with an air chamber and a gas chamber, a blower for injecting air into the air chamber and a gas supply mechanism for inputting gas into the gas chamber are fixedly arranged on the burner main body, and further includes: At least two burner modules, each of the burner modules includes an air pipe fixedly arranged on the burner body and a first gas pipe fixedly arranged on the burner body. The first gas pipe passes through the air pipe. One end of the first gas pipe is provided with a connector, and a guiding pipe is fixedly arranged on the connector. A gap for air circulation is left between the guiding pipe and the air pipe. The connector has a gas connection passage communicating with the first gas pipe, and at least two gas outlet pipes fixedly arranged on the connector and all communicating with the gas connection passage pass through the gap respectively. An igniter, fixedly arranged on the burner body, is used for igniting the gas after mixing with air.

[0007] The beneficial effects of the present invention are as follows: During use, start the blower. The air output by the blower enters the air cavity. The air entering the air cavity enters from one end of each air pipe and is blown out from the other end of the air pipe through the guidance of the air pipe. The air supply mechanism can transport the external gas source to the gas cavity, and the gas in the gas cavity is dispersed and ejected along each first gas pipe, the gas connection passage in the connector and each gas outlet pipe. The ejected gas is mixed with the blown air again. This process separates the air and the gas and transports them to the combustion area. Start the igniter to ignite, and under the action of the high-temperature flue gas in the boiler, the mixed gas is ignited to achieve the purpose of gas combustion. Since this gas burner adopts the structure of multiple burner modules, and each burner module adopts the structure of multiple second gas pipes, the gas can be evenly dispersed, improving the sufficiency of gas combustion. In addition, in the form of dispersed combustion of the gas, its combustion temperature is also evenly dispersed, making the combustion temperature constant, avoiding the situation of local high temperature, effectively reducing the generation of nitrogen oxides, so as to reduce the emission of nitrogen oxides. Description of the Drawings

[0008] Figure 1 is a schematic structural diagram of a specific embodiment in the present invention.

[0009] Figure 2 is a schematic structural diagram of the gas input pipe, burner module, auxiliary combustion module and igniter in a specific embodiment of the present invention.

[0010] Figure 3 is a three-dimensional sectional view of the burner body in a specific embodiment of the present invention.

[0011] Figure 4 is a schematic structural diagram of the air outlet adjusting device in a specific embodiment of the present invention.

[0012] Figure 5 is a sectional view of the burner body and the burner module in a specific embodiment of the present invention.

[0013] Figure 6It is a cross-sectional view of the air pipe, connector, guide pipe, and gas outlet pipe of a specific embodiment in the present invention.

[0014] Figure 7 It is a schematic structural diagram of the air pipe, guide pipe, and gas outlet pipe of a specific embodiment in the present invention.

[0015] Figure 8 It is a cross-sectional view of the auxiliary combustion module of a specific embodiment in the present invention.

[0016] Figure 9 It is a schematic diagram of the burner installed in the furnace in a specific embodiment of the present invention, showing the direction of flue gas internal circulation.

[0017] Reference numerals: 10, burner main body; 11, installation box; 111, installation plate; 112, air duct; 113, cover; 114, partition; 115, air inlet pipe; 116, air outlet adjusting device; 1161, connecting frame; 1162, rotating shaft; 1163, driving motor; 1164, pointer; 1165, scale; 1166, wind deflector; 1167, transmission mechanism; 117, air guide frame; 1171, air guide surface; 12, air chamber; 13, gas chamber; 20, fan; 30, gas supply mechanism; 31, gas input pipe; 40, burner head module; 41, air pipe; 42, first gas pipe; 421, curved section; 422, straight section; 43, support plate; 44, connector; 441, gas connection channel; 45, guide pipe; 46, gap; 47, gas outlet pipe; 50, auxiliary combustion module; 51, second gas pipe; 511, linear nozzle; 52, throttle valve; 521, plugging rod; 60, igniter. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] As Figures 1 to 9 shown, the gas burner of the present invention includes a burner main body 10, which has an air chamber 12 and a gas chamber 13. A fan 20 is fixedly installed on the burner main body 10 and is used to inject air into the air chamber 12. A gas supply mechanism 30 is connected to the burner main body 10 and is used to input gas into the gas chamber 13. At least two burner head modules 40 and at least two auxiliary combustion modules 50 are both installed on the burner main body 10. The burner head module 40 can export the air in the air chamber 12 and at the same time export the gas in the gas chamber 13 for mixing. The auxiliary combustion module 50 can also export the gas in the gas chamber 13. An igniter 60 is installed on the burner main body 10 and can ignite the mixed air and gas.

[0020] Refer toFigures 1 to 5 As shown, the burner body 10 includes an installation box 11. An air chamber 12 and a gas chamber 13 are provided inside the installation box 11. The bottom of the installation box 11 is fixedly connected to the blower 20, and the air chamber 12 is communicated with the air outlet end of the blower 20. The air supply mechanism 30 and the burner head module 40 are both connected to the installation box 11.

[0021] Continue to refer to Figure 3 As shown, the installation box 11 includes an installation plate 111, which is used to be connected to the boiler for assembling the entire gas burner. A wind cylinder 112 is fixedly installed on the installation plate 111. One end of the wind cylinder 112 away from the installation plate 111 is detachably connected with a cover 113 through a bolt fastener. A handle is also welded on the cover 113 for people to hold the cover 113. A partition plate 114 is welded inside the wind cylinder 112. The partition plate 114 divides the space inside the wind cylinder 112 into an air chamber 12 and a gas chamber 13. The bottom of the wind cylinder 112 is fixedly connected to an air inlet pipe 115. The bottom of the air inlet pipe 115 is fixedly connected to the blower 20 through a bolt fastener. It should be noted that the top of the air inlet pipe 115 is communicated with the air chamber 12, the bottom of the air inlet pipe 115 is communicated with the air outlet end of the blower 20, and an air outlet adjusting device 116 is also installed on the air inlet pipe 115 to adjust the air passing through the air inlet pipe 115. A wind guiding frame 117 is press-fitted between the wind cylinder 112 and the cover 113. The wind guiding frame 117 is placed inside the air chamber 12. The wind guiding frame 117 has a wind guiding surface 1171, and the distance from the wind guiding surface 1171 to the partition plate 114 gradually decreases from bottom to top. The wind guiding surface 1171 can rectify the air entering the air chamber 12 to reduce the local resistance of the inner wall of the air chamber 12.

[0022] Continue to refer to Figure 4 As shown, exemplarily, the air outlet adjusting device 116 includes a connecting frame 1161 and two rotating shafts 1162. The connecting frame 1161 is welded on the air inlet pipe 115. A driving motor 1163 is fixedly installed on the connecting frame 1161. The output end of the driving motor 1163 is fixedly connected with a pointer 1164. A scale 1165 matched with the pointer 1164 is welded on the connecting frame 1161. The two rotating shafts 1162 are parallel to each other and both penetrate through the air inlet pipe 115. The two rotating shafts 1162 are both rotatably connected to the air inlet pipe 115 through bearings. Wind baffle plates 1166 placed inside the air inlet pipe 115 are welded on the two rotating shafts 1162. A transmission mechanism 1167 is connected between the two rotating shafts 1162 to realize the synchronous rotation of the two rotating shafts 1162. One end of one of the rotating shafts 1162 is fixedly connected to the output end of the driving motor 1163.

[0023] The drive motor 1163 can drive the rotating shaft 1162 connected thereto to rotate. The rotation of the rotating shaft 1162 can drive another rotating shaft 1162 to rotate synchronously through the transmission mechanism 1167. The rotation of the two rotating shafts 1162 respectively drives the deflection of the two windshields 1166 to adjust the amount of air passing through the air inlet pipe 115. At the same time, the rotation of the output end of the drive motor 1163 can drive the pointer 1164 to deflect to point to different scales of the scale 1165, so that the offset of the output shaft of the drive motor 1163 can be visually observed, and the states of the two windshields 1166 can be conveniently controlled.

[0024] Exemplarily, the transmission mechanism 1167 includes first transmission arms respectively and fixedly connected to the two rotating shafts 1162. The two first transmission arms are parallel to each other. The ends of the two first transmission arms far from the rotating shafts 1162 are both rotatably connected with connecting shafts through bearings, and the two connecting shafts are both rotatably connected with the same second transmission arm through bearings.

[0025] Reference Figure 1 and Figure 2 As shown in

[0026] Reference Figures 1 to 3 、 Figure 5 and Figure 6As shown, in this embodiment, the number of the burner head modules 40 is nineteen, and all the burner head modules 40 are fixedly installed on the burner main body 10 in a uniformly distributed manner. Each burner head module 40 includes an air pipe 41 and a first gas pipe 42. The air pipe 41 is fixedly connected to the partition plate 114 and the mounting plate 111. The first gas pipe 42 includes a curved portion 421 and a straight portion 422 connected to the curved portion 421. One end of the curved portion 421 is detachably connected to the partition plate 114 through a bolt fastener. The straight portion 422 is located inside the air pipe 41, and the central axis of the air pipe 41 is collinear with the central axis of the straight portion 422. One end of the straight portion 422 away from the curved portion 421 is detachably connected with a connector 44 through a bolt fastener. One end of the connector 44 away from the straight portion 422 is fixedly connected with a guide pipe 45. The outer wall diameter of the guide pipe 45 is larger than the diameter of the straight portion 422. A gap 46 for air circulation is left between the outside of the guide pipe 45 and the inner wall of the air pipe 41. Exemplarily, the outer surface of the connector 44 is conical, and the diameter of the connector 44 gradually increases from the straight portion 422 to the direction of the guide pipe 45 to bridge the diameter gap between the straight portion 422 and the guide pipe 45. In addition, the conical surface outside the connector 44 can also guide the air flowing in the air pipe 41 to make the air flow smoothly towards the guide pipe 45. The connector 44 has a gas connection channel 441, and at least two gas outlet pipes 47 communicating with the gas connection channel 441 are fixedly connected to the connector 44. All the gas outlet pipes 47 are uniformly distributed around the circumferential direction of the connector 44. All the gas outlet pipes 47 pass through the gap 46. In other words, the gas outlet pipes 47 extend between the port of the air pipe 41 and the port of the guide pipe 45, and the gas outlet pipes 47 are almost in contact with the outer circumferential wall of the guide pipe 45.

[0027] In this embodiment, at least two support plates 43 are also welded to the outside of the straight portion 422. All the support plates 43 are uniformly distributed along the circumferential direction of the straight portion 422. In this embodiment, the number of the support plates 43 is four. All the support plates 43 can stably support the straight portion 422 inside the air pipe 41 to ensure that the central axis of the air pipe 41 is collinear with the central axis of the straight portion 422.

[0028] It should be noted that the air in the air chamber 12 can flow along the air pipe 41 and finally be blown out between the air pipe 41 and the guiding pipe 45. The fuel gas in the fuel gas chamber 13 can be ejected through the first fuel gas pipe 42, the fuel gas connection channel 441 in the connector 44, and the fuel gas extraction pipe 47. In addition, the fuel gas with a certain speed ejected from the fuel gas extraction pipe 47 will be axially released forward closely along the outer circumferential wall of the guiding pipe 45. The fuel gas concentration is the highest near the fuel gas extraction pipe 47. As the fuel gas is released towards the end of the guiding pipe 45, the fuel gas concentration gradually decreases. The fuel gas can be ignited at a position near the end of the guiding pipe 45, effectively reducing the content of nitrogen oxides generated. It should be noted that the position where the fuel gas extraction pipe 47 extends between the port of the air pipe 41 and the port of the guiding pipe 45 can be adjusted according to the actual matching situation of the burner and the boiler.

[0029] Reference Figure 2 、 Figure 3 、 Figure 5 and Figure 8 As shown, in this embodiment, the number of the auxiliary combustion modules 50 is twelve. Each auxiliary combustion module 50 includes a second fuel gas pipe 51 and a throttle valve 52 corresponding to the second fuel gas pipe 51. The second fuel gas pipe 51 is fixedly connected to the burner main body 10. The second fuel gas pipe 51 communicates with the fuel gas chamber 13, and the length of the second fuel gas pipe 51 is less than the length of the air pipe 41. A linear nozzle 511 is arranged on the second fuel gas pipe 51. The fuel gas in the fuel gas chamber 13 can flow through the second fuel gas pipe 51 and be ejected from the linear nozzle 511. The throttle valve 52 can adjust the fuel gas flow rate through the second fuel gas pipe 51. The throttle valve 52 includes a screw hole opened on the partition plate 114. A plugging rod 521 is threadedly connected in the screw hole. The central axis of the plugging rod 521 is collinear with the central axis of the second fuel gas pipe 51. One end of the plugging rod 521 close to the second fuel gas pipe 51 is conical. A driving groove is opened at the end of the plugging rod 521 far from the second fuel gas pipe 51. A screwdriver can be inserted into the driving groove, and turning the screwdriver can drive the plugging rod 521 to rotate, so as to force the plugging rod 521 to move along its axial direction, and then approach or move away from the second fuel gas pipe 51 to adjust the air intake of the second fuel gas pipe 51.

[0030] Continue to refer to Figure 1 and Figure 2 As shown, the igniter 60 is installed on the mounting plate 111 of the burner main body 10 and can ignite the fuel gas ejected by the fuel gas burner.

[0031] During use, the blower 20 is started. The air output by the blower 20 enters the air chamber 12 through the air inlet pipe 115. The air entering the air chamber 12 is guided along the air guiding surface 1171 on the air guiding frame 117 towards the direction of the air pipes 41, and enters from one end of each air pipe 41. It is blown out from the other end of the air pipe 41 through the guidance of the air pipe 41. At the same time, the valve group is opened, and the external gas source can be transported to the gas chamber 13 through the gas input pipe 31. The gas in the gas chamber 13 is dispersed and ejected along each first gas pipe 42, the gas connection channel 441 in the connector 44, and each gas outlet pipe 47. The ejected gas is mixed with the blown air. This process transports the air and gas separately to the combustion area, starts the igniter 60 to ignite, and under the action of the high-temperature flue gas in the boiler, the mixed gas is ignited to achieve the purpose of gas combustion. Since this gas burner adopts the structure of multiple burner modules 40, and each burner module 40 adopts the structure of multiple second gas pipes 51, the gas can be evenly dispersed, as Figure 9 shown, improving the sufficiency of gas combustion. In addition, in the form of dispersed gas combustion, its combustion temperature is also evenly dispersed, making the combustion temperature constant, avoiding the situation of high local temperature, effectively reducing the generation of nitrogen oxides, so as to reduce the emission of nitrogen oxides.

[0032] In addition, in the boiler, the high-temperature flue gas in the boiler will fill around the air pipe 41. Since there is a small amount of oxygen in the flue gas, the oxygen around the air pipe 41 is easily combined with the flue gas under the action of high temperature to form nitrogen oxides. When it is necessary to reduce the nitrogen oxides generated at this place, the throttle valve 52 is controlled to adjust the gas flow rate through the second gas pipe 51, so that the gas in the gas chamber 13 can also flow through the second gas pipe 51 and be ejected from the linear nozzle 511, and is placed around the air pipe 41, as Figure 9 shown, and is ignited under the action of the high-temperature flue gas to consume the oxygen in the flue gas at this part, further reducing the generation of nitrogen oxides and reducing the emission of nitrogen oxides.

Claims

1. A gas burner, comprising a burner body (10), the burner body (10) having an air cavity (12) and a gas cavity (13), the burner body (10) being fixedly provided with a fan (20) for injecting air into the air cavity (12) and a gas supply mechanism (30) for inputting gas into the gas cavity (13), characterized in that: include: At least two burner head modules (40), each of the burner head modules (40) comprising an air pipe (41) fixedly mounted on the burner body (10) and a first gas pipe (42) fixedly mounted on the burner body (10), the first gas pipe (42) passing through the air pipe (41), a connector (44) being provided at one end of the first gas pipe (42), a guide pipe (45) being fixedly mounted on the connector (44), a gap (46) for air circulation being left between the guide pipe (45) and the air pipe (41), a gas connection channel (441) being provided on the connector (44) being connected to the first gas pipe (42), at least two gas outlet pipes (47) being fixedly mounted on the connector (44) and both being connected to the gas connection channel (441), each of the gas outlet pipes (47) passing through the gap (46); The igniter (60) is fixedly mounted on the burner body (10) and is used to ignite the fuel gas mixed with air.

2. The gas burner according to claim 1, characterized in that: The invention also comprises at least two auxiliary combustion modules (50), each of the auxiliary combustion modules (50) comprising a second gas pipe (51) and a throttle valve (52) corresponding to the second gas pipe (51), the second gas pipe (51) being fixedly arranged on the burner body (10), the second gas pipe (51) being communicated with the gas chamber (13), the length of the second gas pipe (51) being shorter than the length of the air pipe (41), the second gas pipe (51) being provided with a linear nozzle (511), and the throttle valve (52) being arranged on the burner body (10) and being used for adjusting the gas flow rate passing through the second gas pipe (51).

3. The gas burner according to claim 2, characterized in that: The throttle valve (52) comprises a screw hole formed on the burner body (10); a sealing rod (521) is threadedly connected to the screw hole of the burner body (10); a central axis of the sealing rod (521) is colinear with a central axis of the second gas pipe (51); an end of the sealing rod (521) close to the second gas pipe (51) is conical; and an end of the sealing rod (521) away from the second gas pipe (51) is provided with a driving groove.

4. The gas burner according to claim 1, characterized in that: The burner body (10) comprises a mounting box (11), the air cavity (12) and the gas cavity (13) are both arranged in the mounting box (11), the bottom of the mounting box (11) is provided with an air inlet pipe (115) connected to the air cavity (12), the bottom of the air inlet pipe (115) is connected to the air outlet end of the fan (20), the air inlet pipe (115) is also provided with an air outlet adjustment device (116) for adjusting the air passing through the air inlet pipe (115), the mounting box (11) is also provided with an air guide frame (117) arranged in the air cavity (12), the air guide frame (117) is provided with an air guide surface (1171), and the air entering the air cavity (12) from the air duct (115) can be guided along the air guide surface (1171) to the air pipe (41).

5. The gas burner according to claim 4, characterized in that: The air outlet adjustment device (116) comprises a connecting frame (1161) and two rotating shafts (1162); the connecting frame (1161) is fixedly mounted on the air inlet pipe (115); a driving motor (1163) is fixedly mounted on the connecting frame (1161); the two rotating shafts (1162) are parallel to each other and both pass through the air inlet pipe (115); the two rotating shafts (1162) are rotatably connected to the air inlet pipe (115); the two rotating shafts (1162) are fixedly mounted with a windshield (1166) disposed in the air inlet pipe (115); a transmission mechanism (1167) is connected between the two rotating shafts (1162) for controlling the two rotating shafts (1162) to rotate synchronously; one end of one of the rotating shafts (1162) is fixedly connected to an output end of the driving motor (1163).

6. The gas burner according to claim 5, characterized in that: The transmission mechanism (1167) comprises two first transmission arms respectively fixed on two rotating shafts (1162), the two first transmission arms are parallel to each other, one end of the two first transmission arms away from the rotating shaft (1162) is rotatably connected to a connecting shaft, and the two connecting shafts are rotatably connected to the same second transmission arm.

7. The gas burner according to claim 5, characterized in that: The output end of the driving motor (1163) is also fixedly provided with a pointer (1164), and the connecting frame (1161) is fixedly provided with a scale (1165) that cooperates with the pointer (1164).

8. The gas burner according to claim 1, characterized in that: The first gas pipe (42) comprises a curved portion (421) and a straight portion (422) connected to the curved portion (421); one end of the curved portion (421) is fixedly connected to the burner body (10); the straight portion (422) passes through the air pipe (41); at least two support plates (43) are fixedly provided outside the straight portion (422); all the support plates (43) are evenly distributed along the circumferential direction of the first gas pipe (42).

9. The gas burner according to claim 1, characterized in that: The outer surface of the connecting head (44) is tapered, and the diameter of the connecting head (44) gradually increases in a direction from the first gas pipe (42) to the guide pipe (45).

10. The gas burner according to claim 1, characterized in that: The gas supply mechanism (30) comprises a valve group connected to an external gas source, the gas outlet end of the valve group being connected to a gas input pipe (31), and the gas input pipe (31) being connected to the gas chamber (13).

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