Low calorific value low nitrogen bottom burning temperature self-regulating combustor

Abstract

The application discloses a low-heat-value low-nitrogen bottom burning temperature self-adjusting combustor and relates to the field of thermal energy engineering.The combustor comprises an adapter assembly and a gas nozzle assembly.The adapter assembly comprises an adapter cover, the bottom of the adapter cover is fixedly connected with a bottom cover plate through four internal hexagon bolts, the rear portion of the adapter cover is fixedly connected with a rear cover plate through four internal hexagon bolts, the inside of the adapter cover is fixedly connected with a wind cylinder in a penetrating mode, the top of the wind cylinder is fixedly connected with a butt flange, the top of the wind cylinder is fixedly connected with a fire containment cover through the butt flange, and the top of the fire containment cover is fixedly connected with a necking portion.The combustion-supporting wind is divided into rotational flow combustion-supporting wind, central combustion-supporting wind and peripheral combustion-supporting wind, the gas is divided into central gas and peripheral gas, the gas and the combustion-supporting wind can be mixed and combusted in different modes, and the beneficial effect of optimizing the combustion process is achieved.

Description

Technical Field

[0001] This invention relates to the field of thermal energy engineering, and in particular to a low-calorific-value, low-nitrogen bottom-burning temperature self-regulating burner. Background Technology

[0002] A burner is a key piece of equipment widely used in industrial boilers to mix fuel with air and burn it efficiently to generate heat. It typically consists of a fuel supply system, an air supply system, an ignition device, a combustion chamber, and a control system.

[0003] In oilfields in the field, there are a large number of vertical bottom-fired heaters. These heaters use earthen burners for combustion. Because they use natural draft, the air volume cannot be precisely controlled, which easily leads to an imbalance in the air-fuel ratio. This not only causes incomplete combustion and produces a large amount of carbon monoxide in the flue gas, causing serious pollution to the surrounding environment, but also reduces the thermal efficiency of the boiler. Furthermore, earthen burners are greatly affected by environmental factors. When the outside wind increases or the calorific value and pressure of the gas change suddenly, the earthen burners are very easy to go out, which not only interferes with normal production, but also poses safety hazards. Summary of the Invention

[0004] The main objective of this invention is to provide a low-calorific-value, low-NOx bottom-burning temperature self-regulating burner, which can effectively solve the technical problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A low-calorific-value, low-NOx bottom-burning temperature self-regulating burner includes an adapter assembly and a gas nozzle assembly. The adapter assembly includes an adapter cover, the bottom of which is fixedly connected to a bottom cover plate by four hexagon socket bolts, and the rear of which is fixedly connected to a rear cover plate by four hexagon socket bolts. An air duct is fixedly connected through the top of the adapter cover, and a docking flange is fixedly connected to the top of the air duct. A flame-gathering cover is fixedly connected to the top of the air duct via the docking flange, and a constriction is fixedly connected to the top of the flame-gathering cover.

[0007] The gas nozzle assembly includes a flame stabilizer plate. A fixed base is fixedly connected to the bottom of the adapter shroud. A bottom column is fixedly connected to the bottom of the fixed base, penetrating the top. A main gas pipe is fixedly connected to the top of the bottom column. A gas grading main pipe is located inside the adapter shroud and within the air duct. The bottom of the gas grading main pipe is fixedly connected to one end of the main gas pipe. Six branch pipes are fixedly connected at equal intervals on the outer surface of the gas grading main pipe, and these branch pipes communicate with the interior of the gas grading main pipe. Nozzles are fixedly connected to the top of the branch pipes. Three connecting columns are fixedly connected at equal intervals to the top of the gas grading main pipe. The top of the gas grading main pipe is connected to the flame stabilizer plate via these three connecting columns. The flame stabilizer plate is located inside the flame shroud. Several central holes are opened at the top center of the flame stabilizer plate, penetrating the bottom. Six swirl vanes are rotatably connected at equal intervals through the top of the flame stabilizer plate. Three nozzles are fixedly connected at equal intervals through the top of the flame stabilizer plate.

[0008] As a further embodiment of the present invention, the top of the gas grading main pipe is closed, the bottom of the nozzle is connected to the interior of the gas grading main pipe, and two connecting seats are symmetrically fixedly connected to the outer surface of the gas grading main pipe. A connecting copper sleeve is fixedly connected inside the two connecting seats. A temperature sensor is fixedly connected through the interior of one of the connecting copper sleeves, and the top of the temperature sensor passes through the top of the flame stabilizer plate. An ignition needle is fixedly connected inside the other connecting copper sleeve, and the top of the ignition needle passes through the top of the flame stabilizer plate. The top of the ignition needle is curved.

[0009] As a further embodiment of the present invention, a pair of fixing lugs are fixedly connected to the outer surface of the bottom column and located at the top of the fixed base. The fixing lugs are connected to the fixed base by hexagonal bolts. A fixing rod is fixedly connected to the bottom of the outer surface of the gas grading main pipe. The fixing rod is connected to the adapter cover by hexagonal bolts.

[0010] As a further embodiment of the present invention, a mixing assembly is provided at the front of the adapter cover. The mixing assembly includes a mixing front-end pipe and a mixing rear-end pipe. A mixing fixing flange is fixedly connected between the mixing front-end pipe and the mixing rear-end pipe. A gas inlet pipe is provided on the outer surface of the mixing front-end pipe near the top. An inlet fixing flange is fixedly connected between the gas inlet pipe and the mixing front-end pipe.

[0011] As a further embodiment of the present invention, a mixing rear-end connecting flange is fixedly connected between the rear part of the mixing rear-end pipe and the front part of the adapter cover, and a mixing front-end connecting flange is fixedly connected to the front part of the mixing front-end pipe.

[0012] As a further embodiment of the present invention, the interior of the mixing front-end pipe and the mixing rear-end pipe is provided with a gas main assembly. The gas main assembly includes a second gas main and a gas hose. The front of the first gas main is provided with a quick-release pipe connector. The first gas main and the gas hose are connected to each other through the quick-release pipe connector. The front of the gas hose is provided with a connecting buckle. The gas hose and the second gas main are connected to each other through the connecting buckle. The top of the second gas main is fixedly connected with an air inlet connector, which is connected to the gas inlet pipe.

[0013] As a further embodiment of the present invention, a docking seat is fixedly connected to the bottom of the outer surface of the second gas main pipe, a fixing column is provided on the inner wall of the mixing front-end pipe, a fixing bolt is threadedly connected to the bottom of the outer surface of the mixing front-end pipe, and the bottom of the docking seat is connected to the fixing column by the fixing bolt.

[0014] As a further embodiment of the present invention, an air supply assembly is provided at the front of the mixing front-end pipe. The air supply assembly includes a fan body, and an air supply connection flange is fixedly connected to the rear of the fan body. The air supply connection flange and the mixing front-end connection flange are fixed to each other by four Allen bolts. An air inlet pipe is fixedly connected through one side of the fan body. A baffle is rotatably connected inside the air inlet pipe. Two fixed brackets are fixedly connected to the top of the outer surface of the air inlet pipe. An actuator is fixedly connected to the top of the two fixed brackets. A motor is fixedly connected to the other side of the fan body.

[0015] As a further embodiment of the present invention, the output shaft of the actuator is fixedly connected to the rotating shaft of the baffle, and the output shaft of the motor is fixedly connected to the fan blades inside the fan body.

[0016] As a further embodiment of the present invention, a fixing seat is fixedly connected to one side of the adapter cover, and a flame detector is fixedly connected to the fixing seat through the interior of the adapter cover.

[0017] The beneficial effects of this invention are as follows:

[0018] By setting up a transfer component and a gas nozzle component, the combustion air is divided into swirling combustion air, central combustion air and peripheral combustion air, and the gas is divided into central gas and peripheral gas, so that the gas and combustion air can be mixed and burned in different ways, achieving the beneficial effect of optimizing the combustion process.

[0019] By setting up a flame stabilizer, swirl vanes, and a central hole, the central combustion gas disperses the flame and stabilizes combustion under the impact of the central combustion-supporting air, reducing the flame dispersion temperature and reducing the generation of nitrogen oxides, thus achieving the beneficial effect of reducing nitrogen oxide emissions.

[0020] By setting a constriction, the mixed gas is guided to converge towards the center and form a vortex, which entrains the incompletely burned gas to participate in combustion. The flue gas generated after combustion and the unburned mixed combustible gas are re-entrained to participate in combustion, which achieves the beneficial effects of improving the degree of combustion, improving combustion efficiency, making full use of fuel and reducing energy waste.

[0021] By setting up a temperature sensor and an actuator, the actuator drives the baffle to rotate and adjust the damper opening according to the flame temperature detected by the temperature sensor, so as to adapt to the changes in the calorific value and pressure of the gas and achieve the beneficial effect of avoiding safety hazards such as flameout.

[0022] By setting up structures such as fixed lugs, fixed rods, fixed seats, and fixed bolts, the components are stably fixed, which achieves the beneficial effects of stabilizing the overall structure of the burner, ensuring the stability of the gas grading main pipe, and thus ensuring the gas delivery and flame stability.

[0023] By setting up docking buckles, quick-release pipe connection buckles, and mixing fixing flanges, the gas main pipe II and the gas hose, the gas hose and the gas main pipe I, and the mixing front end pipe and the mixing rear end pipe can be quickly docked and fixedly connected to ensure stable gas delivery. This achieves the beneficial effect of facilitating the installation, disassembly, and maintenance of the burner's gas delivery pipeline. As a result, the burner can be quickly assembled when used in the field oilfield, while also reducing the time and labor costs required for maintenance and replacement of parts, and improving the overall operability and practicality of the burner.

[0024] Since the various components are fixedly connected by various flanges and hex bolts, the flanges ensure the sealing of the connection between the components. This connection method ensures the sealing of the gas during the transmission process, avoids the risk of gas leakage, improves the safety of the burner, and better maintains the stability of the entire gas transmission system when the gas composition and pressure change, ensuring a stable gas supply and thus ensuring the continuous and stable operation of the combustion process. This provides a reliable foundation for achieving the self-regulating function of low-calorific-value and low-NOx bottom-burning temperature. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a low-calorific-value, low-nitrogen bottom-burning temperature self-regulating burner according to the present invention;

[0026] Figure 2 This is a sectional view of the overall structure of a low-calorific-value, low-nitrogen bottom-burning temperature self-regulating burner according to the present invention.

[0027] Figure 3 This is a cross-sectional diagram of the adapter assembly for a low-calorific-value, low-NOx bottom-burning temperature self-regulating burner according to the present invention;

[0028] Figure 4This is a structural diagram illustrating the gas nozzle assembly and gas main pipe assembly of a low-calorific-value, low-nitrogen bottom-burning temperature self-regulating burner according to the present invention.

[0029] Figure 5 This is a left view of the gas nozzle assembly of a low-calorific-value, low-nitrogen bottom-burning temperature self-regulating burner according to the present invention.

[0030] Figure 6 This is a cross-sectional diagram of the mixing component of a low-calorific-value, low-NOx bottom-burning temperature self-regulating burner according to the present invention;

[0031] Figure 7 This is a diagram illustrating the air supply assembly of a low-calorific-value, low-nitrogen bottom-burning temperature self-regulating burner according to the present invention.

[0032] In the diagram: 1. Air supply assembly; 2. Mixing assembly; 3. Adapter assembly; 4. Gas nozzle assembly; 5. Temperature sensor; 6. Ignition needle; 7. Mounting base; 8. Flame detector; 9. Gas main pipe assembly; 10. Fan body; 11. Air inlet pipe; 12. Baffle; 13. Mounting bracket; 14. Actuator; 15. Air supply connection flange; 16. Motor; 17. Mixing front-end pipe; 18. Mixing rear-end pipe; 19. Mixing fixed flange; 20. Air inlet fixed flange; 21. Gas inlet pipe; 22. Mixing front-end connection flange; 23. Mixing rear-end connection flange; 24. Mounting column; 25. Adapter cover; 26. Rear cover plate; 27. Bottom cover plate; 28. Air duct; 29. ​​Connecting flange; 30. Flame hood; 31. Narrowing opening; 32. Fixed base; 33. Inlet connecting pipe; 34. Gas main pipe II; 35. Connecting seat; 36. Fixing bolt; 37. Connecting buckle; 38. Gas hose; 39. Gas main pipe I; 40. Pipe quick-release connector; 41. Gas graded main pipe; 42. Flame stabilizer plate; 43. Connecting column; 44. Nozzle; 45. Center hole; 46. Swirl blade; 47. Branch pipe; 48. Nozzle; 49. Connecting seat; 50. Connecting copper sleeve; 51. Fixing rod; 52. Base column; 53. Fixing lug. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] like Figure 1 - Figure 7As shown, a low-calorific-value, low-NOx bottom-burning temperature self-regulating burner includes a transfer assembly 3 and a gas nozzle assembly 4. The transfer assembly 3 includes a transfer cover 25. The bottom of the transfer cover 25 is fixedly connected to a bottom cover plate 27 by four hexagon socket bolts. The rear of the transfer cover 25 is fixedly connected to a rear cover plate 26 by four hexagon socket bolts. The interior of the transfer cover 25 is fixedly connected to the top of a duct 28. The top of the duct 28 is fixedly connected to a connecting flange 29. The top of the duct 28 is fixedly connected to a flame-gathering cover 30 through the connecting flange 29. The top of the flame-gathering cover 30 is fixedly connected to a constriction 31.

[0035] The gas nozzle assembly 4 includes a flame stabilizer 42. A fixed base 32 is fixedly connected to the bottom of the adapter 25. A base column 52 is fixedly connected to the bottom of the fixed base 32, extending through the top. A gas main pipe 39 is fixedly connected to the top of the base column 52. A gas grading main pipe 41 is located inside the adapter 25 and within the air duct 28. The bottom of the gas grading main pipe 41 is fixedly connected to one end of the gas main pipe 39. Six branch pipes 47 are fixedly connected at equal intervals to the outer surface of the gas grading main pipe 41. The branch pipes 47 are connected to the interior of the gas grading main pipe 41. The top of the branch pipe 47 is fixedly connected to a nozzle 48, and the top of the gas grading main pipe 41 is fixedly connected to three connecting posts 43 at equal intervals. The top of the gas grading main pipe 41 is connected to the flame stabilizer plate 42 through the three connecting posts 43. The flame stabilizer plate 42 is located inside the flame hood 30. Several central holes 45 are opened through the bottom at the center of the top of the flame stabilizer plate 42. Six swirl blades 46 are rotatably connected through the top of the flame stabilizer plate 42 at equal intervals. Three nozzles 44 are fixedly connected through the top of the flame stabilizer plate 42 at equal intervals.

[0036] First, the combustion-supporting air enters the interior of the adapter 25 from the front and then blows upward along the air duct 28. At this time, the combustion-supporting air is divided into three parts. The first part blows upward against the six swirl blades 46 to form swirling combustion-supporting air. The second part blows upward along several central holes 45 to form central combustion-supporting air. The third part blows upward along the gap between the flame stabilizer 42 and the flame smother 30. This combustion-supporting air impacts the constriction 31 and flows back to the top of the flame stabilizer 42 to form peripheral combustion-supporting air.

[0037] Secondly, the gas enters the interior of the gas main pipe 39 from the front and is then transported upward along the interior of the gas grading pipe 41. The gas is divided into two parts. The first part is ejected from the three nozzles 44 at the top of the gas grading pipe 41 to form the central gas. The second part is transported upward along the six branch pipes 47 through the nozzles 48 into the gap between the gas grading pipe 41 and the air duct 28. The second part of the gas is ejected upward from the gap between the flame stabilizer plate 42 and the flame hood 30 to form the peripheral gas. The gas ejected from the nozzles 48 is also ejected upward along the central hole 45, thus also forming the central gas.

[0038] At this time, the central gas ignites the ejected gas through the ignition needle 6. The central gas mixes with the central combustion air and the swirling combustion air and burns to form a swirling central fire. The central gas disperses the flame under the impact of the central combustion air and reduces the air velocity, making the combustion more stable. Under the premise of stability, the flame dispersion temperature is reduced, thereby reducing the generation of nitrogen oxides.

[0039] After the external combustion gas mixes with the external combustion-supporting air, it flows out from the constriction 31 and burns, forming an external diffusion flame. During the process of flowing out through the constriction 31, the constriction 31 has an inward contraction structure that guides the mixed gas to gather towards the center and forms a swirling flow outward. It entrains the flue gas generated after combustion and the unburned mixed combustible gas back to the constriction 31 to participate in combustion. Through the entrainment effect, the unburned gas can be re-entered into the combustion zone, improving the completeness of combustion, improving combustion efficiency, making full use of fuel, and reducing energy waste.

[0040] In this embodiment, the top of the gas grading main pipe 41 is closed, and the bottom of the nozzle 44 is connected to the interior of the gas grading main pipe 41. Two connecting seats 49 are symmetrically fixedly connected to the outer surface of the gas grading main pipe 41. A connecting copper sleeve 50 is fixedly connected inside the two connecting seats 49. A temperature sensor 5 is fixedly connected through the interior of one of the connecting copper sleeves 50. The top of the temperature sensor 5 passes through the top of the flame stabilizer plate 42. An ignition needle 6 is fixedly connected inside the other connecting copper sleeve 50. The top of the ignition needle 6 passes through the top of the flame stabilizer plate 42, and the top of the ignition needle 6 is curved.

[0041] The ignition needle 6 ignites the central and peripheral combustion gases, thus forming a swirling central flame and a peripheral diffused flame. The top of the temperature sensor 5 detects the temperature of the peripheral diffused flame and the central swirling flame.

[0042] In this embodiment, a pair of fixing lugs 53 are fixedly connected to the outer surface of the base column 52 and located at the top of the fixed base 32. The fixing lugs 53 and the fixed base 32 are connected by hexagonal bolts. A fixing rod 51 is fixedly connected to the bottom of the outer surface of the gas grading main pipe 41. The fixing rod 51 and the adapter cover 25 are connected by hexagonal bolts.

[0043] By fixing the lug 53 and fixing the rod 51, the base column 52 can be fixedly connected to the fixed base 32 and the adapter cover 25 respectively, thereby fixing the gas grading main pipe 41. As a result, when the gas is transported upward along the inside of the gas grading main pipe 41, the gas grading main pipe 41 can remain stable, thus ensuring stable gas delivery. Consequently, the peripheral dispersed fire and the swirling center fire can remain stable.

[0044] In this embodiment, a mixing component 2 is provided at the front of the adapter cover 25. The mixing component 2 includes a mixing front-end pipe 17 and a mixing rear-end pipe 18. A mixing fixing flange 19 is fixedly connected between the mixing front-end pipe 17 and the mixing rear-end pipe 18. A gas inlet pipe 21 is provided on the outer surface of the mixing front-end pipe 17 near the top. An inlet fixing flange 20 is fixedly connected between the gas inlet pipe 21 and the mixing front-end pipe 17.

[0045] In this embodiment, a mixing rear-end connecting flange 23 is fixedly connected between the rear part of the mixing rear-end pipe 18 and the front part of the adapter cover 25, and a mixing front-end connecting flange 22 is fixedly connected to the front part of the mixing front-end pipe 17.

[0046] In this embodiment, a gas main assembly 9 is provided inside the mixing front-end pipe 17 and the mixing rear-end pipe 18. The gas main assembly 9 includes a second gas main 34 and a gas hose 38. A quick-release connector 40 is provided at the front of the first gas main 39. The first gas main 39 and the gas hose 38 are connected to each other through the quick-release connector 40. A docking buckle 37 is provided at the front of the gas hose 38. The gas hose 38 and the second gas main 34 are connected to each other through the docking buckle 37. An air inlet connector 33 is fixedly connected through the top of the second gas main 34. The air inlet connector 33 is connected to the gas inlet pipe 21.

[0047] Gas enters the gas main pipe 24 through the gas inlet pipe 21 and along the inlet connector pipe 33. It then flows through the connector 37, the gas hose 38 and the quick-release connector 40, so that gas can be delivered along the gas main pipe 1 39 and into the gas graded main pipe 41, thus forming central gas and peripheral gas.

[0048] In this embodiment, a docking seat 35 is fixedly connected to the bottom of the outer surface of the gas main pipe 2 34, a fixing column 24 is provided on the inner wall of the mixing front pipe 17, and a fixing bolt 36 is threadedly connected to the bottom of the outer surface of the mixing front pipe 17. The bottom of the docking seat 35 is connected to the fixing column 24 by the fixing bolt 36.

[0049] The cooperation of the docking seat 35, the fixing column 24 and the fixing bolt 36 can fix the gas main pipe 2 34 inside the mixing front end pipe 17, so as to avoid the gas transmission being unstable due to the vibration of the gas main pipe 2 34 during the transmission.

[0050] In this embodiment, an air supply assembly 1 is provided at the front of the mixing front-end pipe 17. The air supply assembly 1 includes a fan body 10. An air supply connection flange 15 is fixedly connected to the rear of the fan body 10. The air supply connection flange 15 and the mixing front-end connection flange 22 are fixed to each other by four Allen bolts. An air inlet pipe 11 is fixedly connected through one side of the fan body 10. A baffle 12 is rotatably connected inside the air inlet pipe 11. Two fixed brackets 13 are fixedly connected to the top of the outer surface of the air inlet pipe 11. An actuator 14 is fixedly connected to the top of the two fixed brackets 13. A motor 16 is fixedly connected to the other side of the fan body 10.

[0051] The actuator 14 is started, which drives the baffle 12 to rotate inside the air inlet pipe 11, thereby opening one end of the air inlet pipe 11. At this time, the motor 16 is started to drive the fan blades inside the fan body 10 to rotate, thereby drawing external air into the fan body 10 along one end of the air inlet pipe 11. The air is then delivered to the mixing front end pipe 17 along the rear of the fan body 10, and then blown into the transfer cover 25 along the mixing rear end pipe 18, thereby forming swirling combustion air, peripheral combustion air and central combustion air.

[0052] When the gas composition changes, resulting in a decrease in calorific value or a decrease in gas pressure, temperature sensor 5 detects a decrease in the temperature of the resulting flame. When the temperature is lower than the set temperature, actuator 14 receives the temperature signal from temperature sensor 5, thereby rotating baffle 12 to reduce the gap between baffle 12 and air inlet pipe 11, thus reducing the damper opening until the flame temperature meets the set temperature. When the gas composition changes, resulting in an increase in calorific value or an increase in gas pressure, temperature sensor 5 detects an increase in the temperature of the resulting flame. When the temperature is higher than the set temperature, actuator 14 receives the temperature signal from temperature sensor 5, thereby rotating baffle 12 to increase the gap between baffle 12 and air inlet pipe 11, thus increasing the damper opening until the flame temperature meets the set temperature. Therefore, by adjusting the rotation amplitude of baffle 12 and changing the damper opening, the damper can adapt to changes in the calorific value and pressure of the gas on site, thereby avoiding safety hazards such as flameout.

[0053] In this embodiment, the output shaft of the actuator 14 is fixedly connected to the rotating shaft of the baffle 12, and the output shaft of the motor 16 is fixedly connected to the fan blade inside the fan body 10.

[0054] In this embodiment, a fixing seat 7 is fixedly connected to one side of the adapter cover 25, and a flame detector 8 is fixedly connected to the inside of the adapter cover 25 through the fixing seat 7.

[0055] It should be noted that the present invention is a low-calorific-value, low-NOx bottom-burning temperature self-regulating burner. In use, firstly, the combustion air enters the interior of the adapter 25 from the front part of the adapter 25, and then blows upward along the air duct 28. At this time, the combustion air is divided into three parts. The first part blows upward against the six swirl blades 46, thereby forming swirling combustion air. The second part blows upward along several central holes 45, thereby forming central combustion air. The third part blows upward along the gap between the flame stabilizer 42 and the flame hood 30. This combustion air impacts the constriction 31 and flows back to the top of the flame stabilizer 42, thereby forming peripheral combustion air.

[0056] Secondly, the gas will enter the interior of the second gas main pipe 34 through the gas inlet pipe 21 and along the inlet connecting pipe 33, and then flow through the interior of the connecting buckle 37, the gas hose 38 and the quick-release pipe connection buckle 40, so that the gas can be delivered along the first gas main pipe 39 and into the interior of the gas grading main pipe 41. The gas enters the interior of the first gas main pipe 39 from the front, and then is delivered upward along the interior of the gas grading main pipe 41. The gas is divided into two parts. The first part is sprayed out from the three nozzles 44 at the top of the gas grading main pipe 41 to form the central gas. The second part is delivered upward along the six branch pipes 47 through the nozzles 48 into the gap between the gas grading main pipe 41 and the air duct 28, so that the second part of the gas will be sprayed upward from the gap between the flame stabilizer plate 42 and the flame hood 30, thus forming the peripheral gas. In addition, the gas sprayed from the nozzles 48 will also be sprayed upward along the central hole 45, thus also forming the central gas.

[0057] At this time, the central gas ignites the ejected gas through the ignition needle 6. The central gas mixes with the central combustion air and the swirling combustion air and burns to form a swirling central fire. The central gas disperses the flame under the impact of the central combustion air and reduces the air velocity, making the combustion more stable. Under the premise of stability, the flame dispersion temperature is reduced, thereby reducing the generation of nitrogen oxides.

[0058] After the external combustion gas mixes with the external combustion-supporting air, it flows out from the constriction 31 and burns, forming an external diffused flame. During the process of flowing out through the constriction 31, the constriction 31 has an inward contraction structure that guides the mixed gas to gather towards the center and forms a swirling flow outward. It entrains the flue gas generated after combustion and the unburned mixed combustible gas back to the constriction 31 to participate in combustion. Through the entrainment effect, the unburned gas can be re-entered into the combustion zone, improving the completeness of combustion, improving combustion efficiency, making full use of fuel, and reducing energy waste.

[0059] The actuator 14 is started, which drives the baffle 12 to rotate inside the air inlet pipe 11, thereby opening one end of the air inlet pipe 11. At this time, the motor 16 is started to drive the fan blades inside the fan body 10 to rotate, thereby drawing external air into the fan body 10 along one end of the air inlet pipe 11. The air is then delivered to the mixing front end pipe 17 along the rear of the fan body 10, and then blown into the transfer cover 25 along the mixing rear end pipe 18, thereby forming swirling combustion air, peripheral combustion air and central combustion air.

[0060] When the gas composition changes, resulting in a decrease in calorific value or a decrease in gas pressure, temperature sensor 5 detects a decrease in the temperature of the resulting flame. When the temperature is lower than the set temperature, actuator 14 receives the temperature signal from temperature sensor 5, thereby rotating baffle 12 to reduce the gap between baffle 12 and air inlet pipe 11, thus reducing the damper opening until the flame temperature meets the set temperature. When the gas composition changes, resulting in an increase in calorific value or an increase in gas pressure, temperature sensor 5 detects an increase in the temperature of the resulting flame. When the temperature is higher than the set temperature, actuator 14 receives the temperature signal from temperature sensor 5, thereby rotating baffle 12 to increase the gap between baffle 12 and air inlet pipe 11, thus increasing the damper opening until the flame temperature meets the set temperature. Therefore, by adjusting the rotation amplitude of baffle 12 and changing the damper opening, the damper can adapt to changes in the calorific value and pressure of the gas on site, thereby avoiding safety hazards such as flameout.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A low-heat-value, low-nitrogen-pilot-temperature self-regulating burner comprising a switching assembly (3) and a gas-jet assembly (4), characterized in that: The adapter assembly (3) comprises an adapter cover (25), the bottom of the adapter cover (25) is fixedly connected with a bottom cover plate (27) through four hexagon bolts, the rear of the adapter cover (25) is fixedly connected with a rear cover plate (26) through four hexagon bolts, the inside of the adapter cover (25) is fixedly connected with a wind pipe (28) at the top, the top of the wind pipe (28) is fixedly connected with a butt flange (29), the top of the wind pipe (28) is fixedly connected with a fire containment cover (30) through the butt flange (29), and the top of the fire containment cover (30) is fixedly connected with a necking (31); The gas nozzle assembly (4) comprises a flame stabilizing disc (42), the inside of the adapter cover (25) is fixedly connected with a fixed base (32) at the bottom, the bottom of the fixed base (32) is fixedly connected with a bottom column (52) at the top, the top of the bottom column (52) is fixedly connected with a gas main pipe I (39), the inside of the adapter cover (25) is provided with a gas staged main pipe (41) inside the wind pipe (28), the bottom of the gas staged main pipe (41) is fixedly connected with one end of the gas main pipe I (39), the outer surface of the gas staged main pipe (41) is fixedly connected with six branch pipes (47) at equal intervals, the branch pipes (47) are in communication with the inside of the gas staged main pipe (41), the top of the branch pipes (47) is fixedly connected with nozzles (48), the top of the gas staged main pipe (41) is fixedly connected with three connecting columns (43) at equal intervals, the top of the gas staged main pipe (41) is connected with the flame stabilizing disc (42) through the three connecting columns (43), the flame stabilizing disc (42) is located inside the fire containment cover (30), a plurality of central holes (45) are formed through the bottom at the top center position of the flame stabilizing disc (42), the inside of the flame stabilizing disc (42) is rotatably connected with six swirl vanes (46) at the top at equal intervals, and the inside of the gas staged main pipe (41) is fixedly connected with three injection pipes (44) at the top through the flame stabilizing disc (42).

2. A self-regulating burner with low heat value and low nitrogen light-off temperature according to claim 1, characterized in that: The top of the gas staged main pipe (41) is in a closed state, the bottom of the injection pipe (44) is in communication with the inside of the gas staged main pipe (41), the outer surface of the gas staged main pipe (41) is fixedly connected with two connecting seats (49) in a symmetrical manner, the inside of each of the two connecting seats (49) is fixedly connected with a connecting copper sleeve (50), the inside of one of the connecting copper sleeves (50) is fixedly connected with a temperature sensor (5), the top of the temperature sensor (5) penetrates through the top of the flame stabilizing disc (42), the inside of the other connecting copper sleeve (50) is fixedly connected with an ignition needle (6), the top of the ignition needle (6) penetrates through the top of the flame stabilizing disc (42), and the top of the ignition needle (6) is arranged in a curved manner.

3. A self-regulating burner with low heat value and low nitrogen light-off temperature according to claim 1, characterized in that: The outer surface of the bottom column (52) is fixedly connected with a pair of fixed ear seats (53) at the top of the fixed base (32), the fixed ear seats (53) and the fixed base (32) are connected through hexagon bolts, and the outer surface of the gas staged main pipe (41) is fixedly connected with a fixed rod (51) at the bottom, and the fixed rod (51) and the adapter cover (25) are connected through hexagon bolts.

4. A self-regulating burner with low heat value and low nitrogen light-off temperature according to claim 1, characterized in that: The front part of the adapter cover (25) is provided with a mixing assembly (2), the mixing assembly (2) comprises a mixing front-end pipe (17) and a mixing rear-end pipe (18), a mixing fixed flange (19) is fixedly connected between the mixing front-end pipe (17) and the mixing rear-end pipe (18), and a gas inlet pipe (21) is fixedly connected between the outer surface of the mixing front-end pipe (17) and the top part.

5. A low-heat-value, low-nitrogen-pilot-temperature self-regulating burner according to claim 4, characterized in that: A mixing rear-end connecting flange (23) is fixedly connected between the rear part of the mixing rear-end pipe (18) and the front part of the adapter cover (25), and a mixing front-end connecting flange (22) is fixedly connected to the front part of the mixing front-end pipe (17).

6. A low-heat-value, low-nitrogen-pilot-temperature self-regulating burner according to claim 4, characterized in that: The inside of the mixing front-end pipe (17) and the mixing rear-end pipe (18) is provided with a gas main pipe assembly (9), the gas main pipe assembly (9) comprises a gas main pipe two (34) and a gas hose (38), the front part of the gas main pipe one (39) is provided with a pipe quick-release connecting buckle (40), the gas main pipe one (39) and the gas hose (38) are connected to each other through the pipe quick-release connecting buckle (40), the front part of the gas hose (38) is provided with a butt joint buckle (37), the gas hose (38) and the gas main pipe two (34) are connected to each other through the butt joint buckle (37), and the inside of the gas main pipe two (34) penetrates and is fixedly connected to the top part of an air inlet butt joint pipe (33), which is in communication with the gas inlet pipe (21).

7. A low-heat-value, low-nitrogen-pilot-temperature self-regulating burner according to claim 6, characterized in that: The outer surface of the gas main pipe two (34) is fixedly connected to the bottom part of a butt joint seat (35), the inner wall of the mixing front-end pipe (17) is provided with a fixed column (24), the outer surface of the mixing front-end pipe (17) is screwedly connected to the bottom part of a fixed bolt (36), and the bottom part of the butt joint seat (35) and the fixed column (24) are connected through the fixed bolt (36).

8. A low-heat-value, low-nitrogen-pilot-temperature self-regulating burner according to claim 5, characterized in that: The front part of the mixing front-end pipe (17) is provided with a wind supply assembly (1), the wind supply assembly (1) comprises a fan main body (10), the rear part of the fan main body (10) is fixedly connected to a wind supply connecting flange (15), the wind supply connecting flange (15) and the mixing front-end connecting flange (22) are fixedly connected to each other through four internal hexagonal bolts, the inside of the fan main body (10) penetrates and is fixedly connected to one side of an air inlet pipe (11), the inside of the air inlet pipe (11) is rotatably connected to a baffle (12), the outer surface of the air inlet pipe (11) is fixedly connected to the top part of two fixed supports (13), the top part of the two fixed supports (13) is fixedly connected to an actuator (14), and the other side of the fan main body (10) is fixedly connected to a motor (16).

9. A low-heat-value, low-nitrogen-pilot-temperature self-regulating burner according to claim 8, characterized in that: The output shaft of the actuator (14) and the rotating shaft of the baffle (12) are fixedly connected, and the output shaft of the motor (16) and the fan blade in the inside of the fan main body (10) are fixedly connected.

10. The low-heat-value, low-nitrogen-pilot-temperature self-regulating burner according to claim 1, characterized in that: One side of the adapter cover (25) is fixedly connected to a fixed seat (7), and the inside of the adapter cover (25) penetrates and is fixedly connected to the fixed seat (7) to the flame detector (8).

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