Energy-saving combustion device for expansion furnace and energy-saving combustion nozzle thereof

Abstract

The utility model provides a kind of energy-saving combustion device of expansion furnace and its energy-saving combustion nozzle, it can be in to the angle of combustion nozzle and the length of extension are double-bit adjusted, the newly added flow guide structure is helpful to the mixing of combustion air and gas, the waste heat of expansion furnace is recycled to preheat combustion air, not only save preheating energy and improve combustion efficiency. Including by inside to outside in turn for gas guide pipe and combustion air guide pipe;Combustion head pipe, coaxial solid is located in the air outlet end of combustion air guide pipe, annular combustion air passage is formed between the gas guide pipe and combustion air guide pipe;L-shaped air guide pipe, communicate to the lower part side wall of combustion air guide pipe;Conical guide cylinder, it is gradually tapered structure upwards, circumferentially around setting on the upper end of combustion air guide pipe;Conical guide column, it is gradually broad structure upwards, by support frame coaxial fixed on the upper end of gas guide pipe;Wherein, the guide cylinder and guide column are located in the airflow passage inside combustion head pipe, and the top end axial height of the guide column is higher than guide cylinder.

Description

Technical Field

[0001] This utility model relates to the technical field of perlite expansion equipment, and in particular to an energy-saving combustion device for supplying heat to a perlite expansion furnace and its energy-saving burner. Background Technology

[0002] A gas-fired perlite expansion furnace is a specialized piece of equipment that uses fuel (such as natural gas, coal gas, or liquefied petroleum gas) to produce expanded perlite. This equipment heats perlite ore at high temperatures, causing it to expand rapidly and form a porous, lightweight material, which is widely used in building insulation, refractory materials, and LNG tank filling.

[0003] The burner of a gas-fired perlite expander is its core thermal component, directly affecting fuel efficiency, temperature control accuracy, and product quality. The burner converts the chemical energy of the gas into high-temperature radiant energy, which directly heats the falling perlite ore through the flame.

[0004] Chinese utility model patent CN202122923949.7 discloses an automatic ignition nozzle for a perlite gas-fired open-pore expansion furnace burner, published on May 10, 2022. It includes a burner body and a shell. Six adjustable-angle nozzles are hinged to the bottom of the body. Rotating a chuck moves a pull rod, which in turn rotates the nozzles, allowing adjustment of the flame angle and improving burner stability. The nozzles of this utility model have a structured chamber to improve airflow. This chamber pressurizes and rotates asymmetrical airflow through a vortex fan, ensuring uniform airflow in contact with natural gas and complete combustion, effectively improving gas utilization and demonstrating good practicality. While this utility model allows adjustment of the nozzle angle to accommodate multiple nozzles, in some cases, adjusting the nozzle length is necessary to regulate the flame height and adapt to the expansion of perlite under different conditions. The aforementioned utility model does not allow adjustment of the nozzle length. Although the aforementioned utility model adds a vortex fan for pressurization and rotation, it is located in the combustion air channel between the guide tube and the burner nozzle. It can only be used to pressurize the combustion air to accelerate its airflow, but its effect on mixing the combustion air and fuel gas is not significant. Furthermore, the combustion air in the aforementioned utility model is not preheated, which reduces the combustion efficiency. Utility Model Content

[0005] To address the above technical problems, this utility model provides an energy-saving combustion device for an expansion furnace and its energy-saving burner nozzle. The nozzle nozzle angle and extension length can be adjusted in two positions. The newly added flow guiding structure helps to mix the combustion air and gas. The waste heat of the expansion furnace is recovered and used to preheat the combustion air, which not only saves preheating energy but also improves combustion efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] Option 1, an energy-saving burner, comprising:

[0008] The coaxially sleeved tubular assembly consists of a gas conduit and a combustion air conduit, from the inside out. The lower end of the combustion air conduit forms a sealed connection with the gas conduit, and the gas conduit extends downward beyond the combustion air conduit.

[0009] The combustion head tube is coaxially fixed to the air outlet end of the combustion air duct, and an annular combustion air channel is formed between the gas duct and the combustion air duct.

[0010] The L-shaped air duct connects to the lower side wall of the combustion air duct.

[0011] A tapered guide tube, with an upwardly tapering structure, is circumferentially arranged around the upper end of the combustion air duct;

[0012] The tapered guide column, with an upwardly widening structure, is coaxially fixed to the upper end of the gas conduit via a support frame;

[0013] Both the guide cylinder and the guide column are located inside the airflow channel of the combustion head tube, and the axial height of the top of the guide column is higher than that of the guide cylinder.

[0014] Furthermore, in Scheme 2, based on Scheme 1, the sealing connection structure includes a first flange fixed to the lower part of the combustion air duct, a second flange fixed to the gas duct, and a sealing gasket pressed between the two flanges. The first flange and the second flange are fastened together by a bolt assembly.

[0015] Furthermore, in Scheme 3, based on Scheme 1, the support frame includes a support column vertically fixed to the bottom surface of the guide column, and multiple connecting rods radially connected between the support column and the inner wall of the gas conduit.

[0016] Furthermore, in Scheme 4, based on Scheme 1, the top end face of the gas conduit and the combustion-supporting air conduit are flush.

[0017] Furthermore, in Scheme 5, based on Scheme 1, an outer sleeve is axially slidably fitted onto the combustion-supporting air duct, the lower end of which is rotatably connected to an internally threaded cylinder; the outer wall of the combustion-supporting air duct is provided with an externally threaded section that meshes with the internally threaded cylinder.

[0018] Option 6, an energy-saving combustion device for an expansion furnace, characterized in that it includes:

[0019] The combustion shell is adapted to be installed at the bottom of the expansion furnace, and its bottom plate has multiple long strip-shaped through grooves that radiate outward evenly around the circumference.

[0020] The energy-saving burner described in any of the multiple schemes 1-4, each burner is pivotally connected to the lower end of the combustion shell via a hinge shaft and is embedded in a corresponding through groove;

[0021] Angle adjustment mechanism, connecting the combustion shell and the burner nozzle, is used to adjust the injection angle of the burner nozzle;

[0022] Combustion-supporting air collection chamber and gas collection chamber, wherein the L-shaped air guide pipe is connected to the combustion-supporting air collection chamber and the gas guide pipe is connected to the gas collection chamber;

[0023] The combustion air preheating device has its air outlet connected to the combustion air collection chamber, and the gas source is connected to the gas collection chamber.

[0024] Option 7, an energy-saving combustion device for an expansion furnace, characterized in that it includes:

[0025] The combustion shell is adapted to be installed at the bottom of the expansion furnace, and its bottom plate has multiple long strip-shaped through grooves that radiate outward evenly around the circumference.

[0026] In the energy-saving burners described in multiple schemes 5, the outer sleeve of each burner is pivotally connected to the combustion shell via a hinge shaft and is embedded in the corresponding through groove;

[0027] An angle adjustment mechanism connects the combustion shell and the outer sleeve, and the hinge point is higher than the connection point between the angle adjustment mechanism and the outer sleeve;

[0028] Combustion-supporting air collection chamber and gas collection chamber, wherein the L-shaped air guide pipe is connected to the combustion-supporting air collection chamber and the gas guide pipe is connected to the gas collection chamber;

[0029] The combustion air preheating device has its air outlet connected to the combustion air collection chamber, and the gas source is connected to the gas collection chamber.

[0030] Furthermore, in Option 8, based on Option 6 or Option 7, the combustion air preheating device includes:

[0031] Elbow pipe, connected to the material outlet of the expansion furnace, forms a curved material channel inside;

[0032] A circulating cooling module includes a water tank fitted outside the elbow pipe. The water tank has an installation interface that seals with both ends of the elbow pipe and is connected to a cooling water circulation system.

[0033] The feed pipe is horizontally connected to the elbow pipe outlet.

[0034] The combustion air preheating box is fitted in the middle section of the feed pipe and is equipped with an air inlet and a preheating air outlet;

[0035] The combustion air blower has an air inlet connected to the preheated air outlet and an air outlet connected to the combustion air collection chamber.

[0036] Furthermore, in Option 9, based on Option 6 or Option 7, the angle adjustment mechanism includes:

[0037] The bracket fixed to the combustion shell has a strip-shaped sliding groove;

[0038] The pull rod is hinged to the burner or outer sleeve at one end, and slidably engaged with the strip groove at the other end.

[0039] The locking chuck is threaded to the end of the pull rod and presses against the surface of the bracket.

[0040] Furthermore, in Scheme 10, based on Scheme 6 or Scheme 7, an automatic igniter for ignition is connected to the gas casing.

[0041] The beneficial effects of this utility model are:

[0042] 1. The combustion-supporting gas is tangentially introduced through the guide tube, impacting the main combustion gas flow ejected from the central axial combustion gas duct at a preset angle, achieving primary turbulent mixing between the two. This initial mixed gas flow then impacts the conical guide column located at the top of the mixing chamber (the combustion head tube constitutes the mixing chamber). Constrained by the surface of the conical guide column, the mixed gas flow diffuses circumferentially along its guiding surface and deflects outward, impacting the inner wall of the combustion head tube. This process triggers intense secondary turbulent mixing and flow field reconstruction, significantly enhancing the molecular-scale mixing between the combustion gas and the combustion-supporting gas. The fully mixed homogeneous combustible mixture is finally ejected from the combustion head tube outlet for combustion. This multi-stage enhanced mixing mechanism effectively promotes complete combustion of fuel (improving combustion efficiency).

[0043] 2. Threaded Drive Mechanism: The meshing of the internal threaded cylinder (291) and the external threaded section (221) converts rotational motion into axial linear displacement. Each unit rotation angle corresponds to a fixed axial displacement (determined by the thread pitch), achieving micron-level length adjustment accuracy and ensuring precise control of the distance between the burner and the material in the furnace. This adapts to the heating requirements of materials with different particle sizes, avoiding direct flame impact on the material (leading to local overheating) or excessive distance (leading to reduced thermal efficiency).

[0044] 3. Angle adjustment is achieved through a hinge point and an angle adjustment mechanism (pull rod / chuck); length adjustment is achieved by rotating the internal threaded cylinder (291). When adjusting the length, there is no need to loosen the angle fixing component (chuck), avoiding repeated calibration; when adjusting the angle, the extended length is automatically maintained. The adjustment mechanism is fully integrated into the axial space of the combustion air duct (22), and the radial dimension is not increased.

[0045] 4. This invention preheats the combustion air, reducing the energy required to heat the air to ignition temperature and improving flame combustion efficiency. It directly utilizes the temperature within the expansion furnace's material channel, saving energy spent on preheating the combustion air. Attached Figure Description

[0046] To more clearly illustrate the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is the main structural view of the present invention;

[0048] Figure 2 This is a structural diagram of the burner nozzle of this utility model installed at the bottom of the combustion-supporting housing;

[0049] Figure 3 This is a perspective view of the burner nozzle of this utility model installed at the bottom of the combustion-supporting housing;

[0050] Figure 4 This is a cross-sectional view of the burner nozzle of this utility model (with an outer sleeve structure);

[0051] Figure 5 This is a front view of the burner nozzle of this utility model (with an outer sleeve structure);

[0052] Figure 6 The three-dimensional combustion nozzle of this utility model Figure 1 (Remove the combustion head tube and internal threaded cylinder; includes an outer sleeve)

[0053] Figure 7 The three-dimensional combustion nozzle of this utility model Figure 2 (Removal of the combustion head tube, with an outer casing);

[0054] Figure 8 The three-dimensional combustion nozzle of this utility model Figure 3 (Removal of the combustion head tube, with an outer casing);

[0055] Figure 9 This is a sectional perspective view of the combustion air preheating device of this utility model;

[0056] Figure 10 This is a perspective view of the combustion air preheating device of this utility model;

[0057] Figure 11 This is a schematic diagram of the present invention installed on an expansion furnace production line.

[0058] Reference numerals in the attached drawings: combustion shell 1, through groove 11, hinge shaft 12;

[0059] Burner nozzle 2, gas conduit 21, combustion air conduit 22, external thread section 221, combustion air channel 23, L-shaped air conduit 24, first flange 25, second flange 26, sealing gasket 27, bolt assembly 28, outer sleeve 29, internal threaded cylinder 291, fastening nut 210.

[0060] Combustion head tube 3, conical guide tube 31, conical guide column 32, support column 331, connecting rod 332;

[0061] Automatic igniter 4;

[0062] Angle adjustment mechanism 5, bracket 51, strip groove 511, pull rod 52, locking chuck 53, positioning nut 54;

[0063] Combustion-supporting air collection chamber 61 and gas collection chamber 62;

[0064] Combustion air preheating device 7, elbow pipe 71, water tank 72, installation interface 721, combustion air blower 73, material guide pipe 74, combustion air preheating box 75, air inlet 751 and preheating air outlet 752. Detailed Implementation

[0065] The following will refer to the appendix in the embodiments of this utility model. Figure 1-11 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0066] Example 1: This utility model discloses an energy-saving burner. The main body of the burner consists of a gas conduit 21 and a combustion air conduit 22 that are nested together from the inside out. A first flange 25 is fitted onto the lower end of the combustion air conduit 21, and a second flange 26 is fitted onto the gas conduit 21. A sealing gasket 27 is pressed between the two flanges, and the two flanges are fastened together by a bolt assembly 28, so that the lower end of the combustion air conduit 22 and the gas conduit 21 form a sealed connection, and an annular combustion air channel 23 is formed between the combustion air conduit 22 and the gas conduit 21. An L-shaped air guide pipe 24 is connected to the lower side wall of the combustion air conduit, and the L-shaped air guide pipe 24 connects to the combustion air channel 23. To improve the mixing of combustion air and fuel gas within the mixing chamber formed by the shorter combustion head pipe, a conical guide tube 31 is installed at the top of the combustion air duct 22, with the smaller end of the conical guide tube 31 located at the top. A conical guide column 32, coaxial with the combustion air duct, is installed above the combustion air duct, with the smaller end of the conical guide column 31 located at the bottom, and at least its top end is higher than the conical guide tube 31. The combination of the conical guide tube 31 and the conical guide column 32 allows the combustion air to impact the main fuel gas flow ejected from the central axial combustion air duct 21 at a predetermined angle from the top of the annular combustion air channel 23, achieving primary turbulent mixing. This initially mixed airflow then impacts the conical guide column 32 located at the top of the mixing chamber (the combustion head pipe 3 forms the mixing chamber). Constrained by the surface of the conical guide column 32, the mixed airflow diffuses circumferentially along its guiding surface and deflects outwards, impacting the inner wall of the combustion head pipe 3. This process induces intense secondary turbulent mixing and flow field reconstruction, significantly enhancing the molecular-scale mixing between the fuel gas and the combustion-supporting gas. The thoroughly mixed homogeneous combustible mixture is finally ejected from the gas head pipe outlet for combustion. This multi-stage enhanced mixing mechanism effectively promotes complete combustion of fuel (improves combustion efficiency).

[0067] In this embodiment, preferably, the support frame 33 includes a support column 331 vertically fixed to the bottom surface of the guide column 32, and a plurality of connecting rods 332 radially connected between the support column 331 and the inner wall of the gas conduit 21. The support frame supports the guide column 32 to the upper end extending out of the gas conduit 21, and the support rods support the guide column 32 and ensure the stability of the guide column after being impacted by gas.

[0068] In this embodiment, preferably, the top ends of the gas conduit 21 and the combustion air conduit 22 are flush with each other. By setting the end faces relatively flush, the outlets of both are aligned, allowing the conical guide tube to allow the combustion air to cut obliquely into the airflow ejected from the gas conduit 21, thus enabling a preliminary mixing of the two.

[0069] Example 2 discloses a burner nozzle with adjustable extension length. In this example, to adjust the extension length while keeping the burner nozzle angle constant, adapting to the heating requirements of materials with different particle sizes, an outer sleeve 22 is slidably fitted around the combustion air duct 22. Specifically, multiple axially extending movable grooves are provided on the inner circular surface of the outer sleeve 29, and multiple axially extending movable sliding strips are provided on the outer circular surface of the combustion air duct 22. The movable sliding strips and movable grooves correspond one-to-one and slide together, so that the outer sleeve 29 and the combustion air duct 22 can only move relative to each other axially and cannot rotate. The outer sleeve 29 is located above the L-shaped air duct 24, and the lower end of the outer sleeve 29 is rotatably connected to an internally threaded cylinder 291. An externally threaded section 221 that meshes with the internally threaded cylinder 291 is provided on the outer wall of the combustion air duct 22. In the embodiment where the outer sleeve 29 is provided, the outer diameter of the combustion head pipe 3 is at least no larger than the outer diameter of the combustion air duct, so that the outer sleeve 29 can be fitted into the installation position from above the combustion head pipe 3. Of course, since the combustion air duct 22 is provided with a movable slide bar on its exterior, a movable groove corresponding to the outer sleeve 29 can also be provided on the inner threaded cylinder 291 to facilitate its passage through the movable slide bar. In order to ensure the stability of the gas sleeve during operation, a clamping nut is also screwed on the outer threaded section 221. The clamping nut is pressed against the lower end face of the inner threaded cylinder 291, so that prestress is generated between the teeth of the inner threaded cylinder and the outer threaded section 221 to ensure that the two will not easily loosen.

[0070] Example 3 discloses an energy-saving combustion device for an expansion furnace. In this example, the burner nozzle installed is the same as that described in Example 1. The combustion device includes a combustion shell 1, which is fixed to the bottom of the expansion furnace during use to heat the material in the expansion furnace. The combustion shell is an open-top shell. Multiple elongated through grooves 11 are evenly distributed in a circular pattern at the bottom of the combustion shell 1. Rotating shafts are fixed at both ends of the combustion air duct 22 of the burner nozzle. Two rotating cylinders are provided on the outer surface of the bottom of the combustion shell 1, and the rotating shafts are rotatably connected within the rotating cylinders.

[0071] An angle adjustment mechanism 5 is provided between the combustion air duct 22 and the bottom of the combustion shell 1 to adjust the injection angle of the burner 2. The angle adjustment mechanism is located in the direction away from the shell at the hinge point between the combustion air duct 22 and the angle adjustment mechanism 5, that is, at the lower part of the hinge point.

[0072] When the burner nozzle 2 needs to be adjusted in angle, the angle can be adjusted by rotating the burner nozzle 2 along the hinge point through the angle adjustment mechanism 5.

[0073] This embodiment also includes a combustion air collection chamber 61 and a gas collection chamber 62. The gas source first introduces gas into the gas collection chamber 62, and then evenly distributes it to multiple gas conduits 21. The combustion air preheating device 7 preheats the combustion air before introducing it into the combustion air collection chamber 61, and then evenly supplies it to multiple combustion air channels 23. The collection chamber eliminates pressure fluctuations, providing a stable gas source to multiple burners. Preheating the combustion air reduces the energy required to heat the air to the ignition temperature, improving flame combustion efficiency.

[0074] Example 4 discloses a second energy-saving combustion device for an expansion furnace. In this example, the installed burner is the burner described in Example 2. This example provides an example where the burner extension length is adjustable.

[0075] The combustion device 2 includes a combustion shell 1, which is fixed to the bottom of the expansion furnace during use to heat the material in the expansion furnace. The combustion shell 1 is an open shell at the top. Multiple elongated through grooves 11 are evenly distributed in a circular pattern at the bottom of the combustion shell 1. Rotating shafts are fixed at both ends of the outer sleeve 29 of the burner nozzle. Two rotating cylinders are provided on the outer surface of the bottom of the combustion shell 1. The rotating shafts are rotatably connected within the rotating cylinders.

[0076] An angle adjustment mechanism 5 is provided between the outer tube 29 and the bottom of the combustion shell 1 to adjust the injection angle of the burner 2. The angle adjustment mechanism is located in the direction away from the shell at the hinge point between the outer tube 29 and the angle adjustment mechanism 5, that is, at the lower part of the hinge point.

[0077] When the burner nozzle 2 needs to be adjusted in angle, the angle can be adjusted by rotating the burner nozzle 2 along the hinge point through the angle adjustment mechanism 5.

[0078] This embodiment also includes a combustion air collection chamber 61 and a gas collection chamber 62. The gas source first introduces gas into the gas collection chamber 62, and then evenly distributes it to multiple gas conduits 21. The combustion air preheating device 7 preheats the combustion air before introducing it into the combustion air collection chamber 61, and then evenly supplies it to multiple combustion air channels 23. The collection chamber eliminates pressure fluctuations, providing a stable gas source to multiple burners. Preheating the combustion air reduces the energy required to heat the air to the ignition temperature, improving flame combustion efficiency.

[0079] In this embodiment, when it is necessary to adjust the extension length of the burner head tube 3, the movement of the outer sleeve 29 is restricted because it is connected to the combustion shell 1 through the angle adjustment mechanism. Therefore, the fastening nut 210 is loosened and the inner threaded cylinder is turned. At this time, with the cooperation of the inner threaded cylinder and the outer threaded section 221, the combustion air duct 22 moves axially, thereby adjusting the extension length of the burner head tube 3 to further adapt to the needs of different working conditions.

[0080] Example 5, based on Example 3 or Example 4, discloses a specific implementation of the angle adjustment mechanism 5. The angle adjustment mechanism includes a bracket 51 fixedly connected to the lower end of the combustion shell 1 and used in conjunction with the burner nozzle 2. The bracket 51 has a strip-shaped groove 511, and a pull rod 52 hinged to the burner nozzle 2 is slidably fitted in the strip-shaped groove 511. A locking chuck 53 is threadedly connected to the pull rod 52. A positioning nut 54 is threadedly fitted on the pull rod 52 on the side of the bracket 51 facing away from the chuck. This allows the pull rod 52 to be moved after the locking chuck 53 and the positioning nut 54 are loosened, thereby driving the burner nozzle 2 hinged to the combustion shell 1 to rotate, thus changing the nozzle angle of the burner nozzle 2. After adjustment, the locking chuck 53 and the positioning nut 54 are tightened onto the bracket 51.

[0081] Example 6, based on Example 3 or Example 4, the combustion air preheating device 7 includes:

[0082] Elbow pipe 71 connects to the material outlet of the expansion furnace, and a curved material channel is formed inside it.

[0083] The circulating cooling module includes a water tank 72 fitted around the elbow pipe 71. The water tank 72 has mounting interfaces 721 that seal with both ends of the elbow pipe 71 and are connected to a cooling water circulation system. The water tank 72 is a cylindrical shell closed at both ends. The cylindrical shell is placed vertically, and a cooling water inlet and outlet are respectively provided at the top of the cylindrical shell. The cooling water inlet and outlet are connected to the cooling water circulation system, which circulates cooling water to the water tank 72 to cool the elbow pipe 71 inside the water tank 72. The expanded perlite material is in a molten state before entering the elbow pipe 71. Because the material channel inside the elbow pipe 71 is cooled by cooling water, the temperature of the molten material flow decreases from 900-1050℃ to 680-780℃ when it enters the elbow pipe, changing the material from a molten state to a granular state. This cooling prevents the high-speed molten material from sticking to the curved part of the elbow pipe 71, causing material accumulation. The cooling water circulation system consists of circulation pipelines, circulation pumps, and cooling units, which are existing technologies and will not be described in detail here.

[0084] The feed pipe 74 is horizontally connected to the elbow pipe 71 at the discharge port; the material flow is discharged from the feed pipe to the subsequent process.

[0085] The combustion air preheating box 75 is installed in the middle section of the material guide pipe 74 and has an air inlet 751 and a preheating air outlet 752.

[0086] The combustion air blower 73 has an air inlet connected to the preheated air outlet 752 and an air outlet connected to the combustion air collection chamber 61.

[0087] A preheating air box 75 is wrapped around the outside of the feed pipe 74, so that the feed pipe 72 heats the air in the preheating air box 75. The air in the preheating air box 75 enters from the air inlet 751 under the action of the combustion blower, is heated, and is discharged from the preheating air outlet 752. This preheating air box 75 makes secondary use of the waste heat of the material flow discharged from the top of the expansion furnace to heat the combustion air of the burner at the bottom of the expansion furnace, which not only increases the combustion efficiency of the combustion air, but also further saves energy.

Claims

1. An energy-saving burner, characterized in that, include: The coaxially sleeved tubular assembly consists of a gas conduit (21) and a combustion air conduit (22) from the inside to the outside. The lower end of the combustion air conduit (22) forms a sealed connection with the gas conduit (21), and the gas conduit (21) extends downward beyond the combustion air conduit (22). The combustion head pipe (3) is coaxially fixed at the air outlet end of the combustion air duct (22), and an annular combustion air channel (23) is formed between the gas duct (21) and the combustion air duct (22); The L-shaped air duct (24) is connected to the lower side wall of the combustion air duct (22); A tapered guide tube (31) with an upwardly tapering structure is circumferentially arranged around the upper end of the combustion air duct (22); The tapered guide column (32) has an upwardly widening structure and is coaxially fixed to the upper end of the gas conduit (21) by a support frame (33); The guide cylinder (31) and the guide post (32) are both located inside the airflow channel of the combustion head tube (3), and the axial height of the top end of the guide post (32) is higher than that of the guide cylinder (31).

2. The energy-saving burner according to claim 1, characterized in that: The sealing connection structure includes a first flange (25) fitted onto the lower part of the combustion air duct (22), a second flange (26) fitted onto the gas duct (21), and a sealing gasket (27) pressed between the two flanges. The first flange (25) and the second flange (26) are fastened together by a bolt assembly (28).

3. The energy-saving burner according to claim 1, characterized in that: The support frame (33) includes a support column (331) that is vertically fixed to the bottom surface of the guide column (32), and a plurality of connecting rods (332) that are radially connected between the support column (331) and the inner wall of the gas conduit (21).

4. The energy-saving burner according to claim 1, characterized in that: The top end face of the gas duct (21) is flush with the top end face of the combustion air duct (22).

5. The energy-saving burner according to claim 1, characterized in that: It also includes an outer sleeve (29) that is axially slidably sleeved on the combustion air duct (22), the lower end of which is rotatably connected to an inner threaded cylinder (291); the outer wall of the combustion air duct (22) is provided with an outer threaded section (221) that meshes with the inner threaded cylinder (291).

6. An energy-saving combustion device for an expansion furnace, characterized in that, include: The combustion shell (1) is adapted to be installed at the bottom of the expansion furnace. Its bottom plate has multiple long strip-shaped through grooves (11) that radiate outwards evenly distributed around its circumference. The energy-saving burner (2) according to any one of claims 1-4, each burner (2) is pivotally connected to the lower end of the combustion shell (1) via a hinge shaft (12) and is embedded in a corresponding through groove (11); Angle adjustment mechanism (5) connects the combustion shell (1) and the burner (2) and is used to adjust the injection angle of the burner (2); Combustion-supporting air collection chamber (61) and gas collection chamber (62), wherein the L-shaped air guide pipe (24) is connected to the combustion-supporting air collection chamber (61) and the gas guide pipe (21) is connected to the gas collection chamber (62); The combustion air preheating device (7) has its air outlet connected to the combustion air collection chamber (61), and the gas source is connected to the gas collection chamber (62).

7. An energy-saving combustion device for an expansion furnace, characterized in that, include: The combustion shell (1) is adapted to be installed at the bottom of the expansion furnace. Its bottom plate has multiple long strip-shaped through grooves (11) that radiate outwards evenly distributed around its circumference. The energy-saving burner (2) according to multiple claims 5, wherein the outer sleeve (29) of each burner (2) is pivotally connected to the combustion shell (1) via a hinge shaft (12) and is embedded in the corresponding through groove (11); Angle adjustment mechanism (5) connects the combustion shell (1) and the outer sleeve (29), and the hinge point is higher than the connection point between the angle adjustment mechanism (5) and the outer sleeve (29); Combustion-supporting air collection chamber (61) and gas collection chamber (62), wherein the L-shaped air guide pipe (24) is connected to the combustion-supporting air collection chamber (61) and the gas guide pipe (21) is connected to the gas collection chamber (62); The combustion air preheating device (7) has its air outlet connected to the combustion air collection chamber (61), and the gas source is connected to the gas collection chamber (62).

8. The energy-saving combustion device for an expansion furnace according to claim 6 or 7, characterized in that: The combustion air preheating device (7) includes: Elbow pipe (71) connects to the material outlet of the expansion furnace, and a curved material channel is formed inside it; The circulating cooling module includes a water tank (72) fitted outside the elbow pipe (71), the water tank (72) being provided with an installation interface (721) that is sealed to both ends of the elbow pipe (71) and connected to the cooling water circulation system; The feed pipe (74) is connected to the outlet of the horizontally connected elbow pipe (71); Combustion-supporting air preheating box (75) is installed in the middle section of the material guide pipe (74) and is provided with an air inlet (751) and a preheating air outlet (752); The combustion air blower (73) has an air inlet connected to the preheated air outlet (752) and an air outlet connected to the combustion air collection chamber (61).

9. The energy-saving combustion device for an expansion furnace according to claim 6 or 7, characterized in that: The angle adjustment mechanism (5) includes: The bracket (51) fixed to the combustion shell (1) has a strip groove (511); A pull rod (52) is hinged at one end to a burner (2) or an outer sleeve (29), and at the other end is slidably engaged with a strip groove (511); The locking chuck (53) is threaded to the end of the pull rod (52) and presses against the surface of the bracket (51).

10. The energy-saving combustion device for an expansion furnace according to claim 6 or 7, characterized in that: An automatic igniter (4) for ignition is connected to the combustion shell (1).

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