Stepped double-water-cooling non-catalytic converter burner

Abstract

The utility model belongs to the technical field of non-catalytic converter burners, and relates to a stepped double-water-cooling non-catalytic converter burner which comprises a long cylindrical burner body, the head of the burner body is in a stepped shaft shape with a thin front end and a thick rear end, and a cylindrical inner cooling water pipe and a cylindrical outer cooling water pipe are arranged at the head of the burner body. The inner cooling water pipe is annularly sleeved with the outer cooling water pipe, and the inner cooling water pipe forwards extends out of the front end face of the outer cooling water pipe in the axial direction; the axial length of the outer-layer water cooling structure is smaller than that of the inner-layer water cooling structure, so that when the burner is used, the outer-layer water cooling structure is positioned outside a hearth of the non-catalytic converter, and the external cylindrical fluid channel is positioned in the burner mounting chamber; the phenomenon that the cooling water structure on the outer layer of the burner is cracked and damaged due to backflow of high-temperature hot air in the furnace is effectively prevented, so that the service life of the burner of the non-catalytic converter is prolonged, and the use cost of the burner is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of non-catalytic reforming furnace burners, and relates to a non-catalytic reforming furnace burner with a stepped double water cooling structure. Background Art

[0002] A non-catalytic reforming furnace is a device used to process combustible tail gases, and is usually used in fields such as processing natural gas, coke oven gas, blast furnace gas to convert combustible gases or tail gases into clean energy. Compared with a catalytic reforming furnace, a non-catalytic reforming furnace does not use a catalyst to accelerate chemical reactions, but relies on high-temperature conditions to promote chemical reactions of combustible gases, thereby achieving the conversion or decomposition of combustible gases. The working principle of a non-catalytic reforming furnace mainly promotes chemical reactions of combustible tail gases through a high-temperature environment, and these reactions usually occur spontaneously under high-temperature conditions without the help of a catalyst. For example, when processing coke oven gas, a non-catalytic reforming furnace can convert coke oven gas into carbon monoxide and hydrogen through high-temperature oxidation, thereby synthesizing clean energy such as methanol. The characteristics of a non-catalytic reforming furnace are: high-temperature operation and no catalyst. The non-catalytic reforming furnace has a wide application range and flexible operation, so it is widely used in waste gas treatment.

[0003] However, existing non-catalytic reforming furnace burners usually adopt a single-layer water cooling method. During use, a part of the length of the head of the burner extends into the non-catalytic reforming furnace. Since the mixed gas of outer-ring natural gas and steam is sprayed into the furnace at a high pressure at the burner inlet, eddy currents will be formed, resulting in the backflow of high-temperature hot gas in the non-catalytic reforming furnace. The burner is exposed to long-term high-temperature thermal radiation and has poor heat dissipation effect, which causes the material fatigue period of the non-catalytic reforming furnace burner. In severe cases, the outer layer of the burner even cracks due to long-term high temperature. Replacing the entire burner is costly and inconvenient. In view of the above problems, the inventor proposes a non-catalytic reforming furnace burner with a stepped double water cooling structure to solve the above problems. Summary of the Utility Model

[0004] The technical solution adopted by the utility model to solve the technical problems is: a non-catalytic reforming furnace burner with a stepped double water cooling structure, comprising: a long cylindrical burner body, the head of the burner body is in the shape of a stepped shaft with a thin front end and a thick rear end, the head of the burner body is provided with a cylindrical inner cooling water pipe and a cylindrical outer cooling water pipe, the outer cooling water pipe is sleeved around the outer circumference of the inner cooling water pipe, and the inner cooling water pipe extends forward along the axis beyond the front end face of the outer cooling water pipe;

[0005] A first inlet pipe is arranged along the axis in the inner cavity of the inner cooling water pipe, the fluid passage of the first inlet pipe is cylindrical, a first cooling water cavity is arranged in the pipe wall of the inner cooling water pipe, the first cooling water cavity is cylindrical, and the first cooling water cavity annularly wraps around the outer circumference of the first inlet pipe; cooling water circulates in the first cooling water cavity;

[0006] A second cooling water chamber is provided inside the pipe wall of the outer cooling water pipe. The second cooling water chamber is cylindrical, and cooling water circulates therein. An annular second inlet pipe is formed between the inner wall of the outer cooling water pipe and the outer wall of the inner cooling water pipe.

[0007] The fluid outlet of the first inlet pipe is circular and arranged axially forward, and the fluid outlet of the second inlet pipe is annular and arranged forward in a direction parallel to the axis.

[0008] Preferably, both the first cooling water chamber and the second cooling water chamber are of an inner and outer double-layer cylindrical structure stratified radially. The water inlet and outlet of the first cooling water chamber and the water inlet and outlet of the second cooling water chamber are respectively located in different layers of their respective inner and outer double-layer cylindrical structures. The inner and outer cavities of the inner and outer double-layer cylindrical structures are communicated at one end of their respective pipelines close to the burner head.

[0009] More preferably, the water inlets of the first cooling water chamber and the second cooling water chamber are respectively located in the inner layer of their respective inner and outer double-layer cylindrical structures, and the water outlets of the first cooling water chamber and the second cooling water chamber are respectively located in the outer layer of their respective inner and outer double-layer cylindrical structures.

[0010] More preferably, the water inlets of the first cooling water chamber and the second cooling water chamber are respectively located in the outer layer of their respective inner and outer double-layer cylindrical structures, and the water outlets of the first cooling water chamber and the second cooling water chamber are respectively located in the inner layer of their respective inner and outer double-layer cylindrical structures.

[0011] More preferably, the water inlets of the first cooling water chamber and the second cooling water chamber are respectively connected to the cooling water inlet connection pipe, and the water outlets of the first cooling water chamber and the second cooling water chamber are respectively connected to the cooling water outlet connection pipe. The cooling water inlet connection pipe and the cooling water outlet connection pipe are respectively fixedly arranged on the side wall of the burner body, and first flanges are respectively provided at the pipe orifices of the cooling water inlet connection pipe and the cooling water outlet connection pipe.

[0012] Preferably, the fluid inlets of the first inlet pipe and the second inlet pipe are respectively arranged at the tail of the burner body. A second flange is provided at the fluid inlet of the first inlet pipe, and a third flange is provided at the fluid inlet of the second inlet pipe.

[0013] More preferably, the fluid inlet direction of the first inlet pipe is arranged axially, and the fluid inlet direction of the second inlet pipe is arranged radially.

[0014] More preferably, a mixture of oxygen and steam circulates in the first inlet pipe, and a mixture of natural gas and steam circulates in the second inlet pipe.

[0015] Preferably, a burner mounting flange is provided on the outer wall of the outer cooling water pipe.

[0016] Preferably, the first inlet pipe, the inner cooling water pipe, the second inlet pipe, and the outer cooling water pipe are coaxial with the rotating shaft.

[0017] The beneficial effects of the present utility model are as follows:

[0018] By adopting an inner and outer double-layer water cooling structure, the outer water cooling structure and the inner water cooling structure are sleeved in a stepped shaft shape. The inner water cooling structure wraps the internal cylindrical fluid channel, and the inner and outer water cooling structures clamp the external cylindrical fluid channel. Moreover, the axial length of the outer water cooling structure is shorter than that of the inner water cooling structure. When the burner is in use, the outer water cooling structure is located outside the non-catalytic reforming furnace hearth, and the external cylindrical fluid channel is in the burner installation chamber, effectively preventing the cracking and damage of the outer cooling water structure of the burner caused by the backflow of high-temperature hot gas in the furnace. Therefore, the present utility model extends the service life of the non-catalytic reforming furnace burner and reduces the use cost of the burner. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a non-catalytic reforming furnace burner with a stepped double water cooling.

[0020] In the figure, 1 is the burner body; 2 is the inner cooling water pipe; 3 is the outer cooling water pipe; 4 is the first inlet pipe; 5 is the second inlet pipe; 6 is the first cooling water chamber; 7 is the second cooling water chamber; 8 is the cooling water inlet connecting pipe; 9 is the cooling water outlet connecting pipe; 10 is the first flange; 11 is the second flange; 12 is the third flange; 13 is the burner installation flange. Detailed Embodiments

[0021] Next, the relevant technologies in the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0022] Refer to Figure 1 , a non-catalytic reforming furnace burner with a stepped double water cooling, comprising: a long cylindrical burner body 1, the head of the burner body 1 is in a stepped shaft shape with a thin front end and a thick rear end, a cylindrical inner cooling water pipe 2 and a cylindrical outer cooling water pipe 3 are provided at the head of the burner body 1, the outer cooling water pipe 3 is annularly sleeved outside the inner cooling water pipe 2, and the inner cooling water pipe 2 axially extends forward beyond the front end face of the outer cooling water pipe 3;

[0023] Inside the inner cooling water pipe 2, a first inlet pipe 4 is axially provided in the inner cavity. The fluid passage of the first inlet pipe 4 is cylindrical. Inside the pipe wall of the inner cooling water pipe 2, a first cooling water cavity 6 is provided. The first cooling water cavity 6 is cylindrical. The first cooling water cavity 6 annularly wraps around the outer circumference of the first inlet pipe 4. Cooling water circulates and flows inside the first cooling water cavity 6;

[0024] Inside the pipe wall of the outer cooling water pipe 3, a second cooling water cavity 7 is provided. The second cooling water cavity 7 is cylindrical. Cooling water circulates and flows inside the second cooling water cavity 7. An annular second inlet pipe 5 is formed between the inner wall of the outer cooling water pipe 3 and the outer wall of the inner cooling water pipe 2;

[0025] The fluid outlet of the first inlet pipe 4 is circular and axially forward. The fluid outlet of the second inlet pipe 5 is annular and forward in a direction parallel to the axis;

[0026] When the burner body 1 is in use, the front end of the first inlet pipe 4 wrapped by the inner cooling water pipe 2 extends into the non-catalytic reforming furnace. The front end of the outer cooling water pipe 3 outside the furnace of the non-catalytic reforming furnace abuts against the outer wall of the non-catalytic reforming furnace. The front end of the second inlet pipe 5 is in the burner installation chamber, facing the burner inlet on the non-catalytic reforming furnace. Since the outer cooling water pipe 3 does not extend into the non-catalytic reforming furnace, the burner in this part will not be burned by the high temperature in the furnace. Although the front end of the first inlet pipe 4 wrapped by the inner cooling water pipe 2 extends into the non-catalytic reforming furnace, the normal temperature and high-pressure mixed gas ejected from the front end of the second inlet pipe 5 forms a cylindrical fluid protection layer on the outer circumference of the inner cooling water pipe 2. The inner layer of the fluid protection layer protects the outer circumference of the inner cooling water pipe 2, and at the same time, the outer layer of the fluid protection layer can continuously isolate the high-temperature hot gas that rolls back in the non-catalytic reforming furnace. Therefore, the front end of the entire burner body 1 no longer directly contacts the high-temperature environment in the non-catalytic reforming furnace, ensuring the working temperature of the front end of the burner of the non-catalytic reforming furnace. Therefore, it can effectively prevent the situation of cracking and damage of the outer layer cooling water structure of the burner caused by the reflux of high-temperature hot gas in the furnace, thereby extending the service life of the burner of the non-catalytic reforming furnace and reducing the use cost of the burner.

[0027] Further, both the first cooling water cavity 6 and the second cooling water cavity 7 are inner and outer double-layer cylindrical structures stratified in the radial direction. The water inlet and outlet of the first cooling water cavity 6 and the water inlet and outlet of the second cooling water cavity 7 are respectively located in different layers of their respective inner and outer double-layer cylindrical structures. The inner and outer cavities of the inner and outer double-layer cylindrical structures are connected at one end close to the burner head of their respective pipelines. The inner and outer double-layer cylindrical structures can enable the cooling water to circulate along the axial length of the entire cooling water cavity, ensuring the circulation flow rate and flow volume of the cooling water at the front end of the burner, and the circulating cooling effect is better.

[0028] Furthermore, the water inlets of the first cooling water chamber 6 and the second cooling water chamber 7 are respectively located in the inner layers of their respective inner and outer double-cylinder structures, and the water outlets of the first cooling water chamber 6 and the second cooling water chamber 7 are respectively located in the outer layers of their respective inner and outer double-cylinder structures; according to different usage environments and requirements, the cooling water circulation can be carried out in the way of water inlet from the inner layer and water outlet from the outer layer.

[0029] Furthermore, the water inlets of the first cooling water chamber 6 and the second cooling water chamber 7 are respectively located in the outer layers of their respective inner and outer double-cylinder structures, and the water outlets of the first cooling water chamber 6 and the second cooling water chamber 7 are respectively located in the inner layers of their respective inner and outer double-cylinder structures; according to different usage environments and requirements, the cooling water circulation can be carried out in the way of water inlet from the outer layer and water outlet from the inner layer.

[0030] Furthermore, the water inlets of the first cooling water chamber 6 and the second cooling water chamber 7 are respectively connected to the cooling water inlet connecting pipe 8, and the water outlets of the first cooling water chamber 6 and the second cooling water chamber 7 are respectively connected to the cooling water outlet connecting pipe 9. The cooling water inlet connecting pipe 8 and the cooling water outlet connecting pipe 9 are respectively fixedly arranged on the side wall of the burner main body 1, and first flanges 10 are respectively arranged at the pipe orifices of the cooling water inlet connecting pipe 8 and the cooling water outlet connecting pipe 9; connecting the water circuits of the first cooling water chamber 6 and the second cooling water chamber 7 to a cooling water circulation pipeline, the cooling water circulation flow of the first cooling water chamber 6 and the second cooling water chamber 7 can be adjusted according to requirements by means of setting tees with different shapes and calibers at the connection points, setting valves with controllable flow rates and flow velocities respectively on the pipelines of the first cooling water chamber 6 and the second cooling water chamber 7, etc., so as to control the cooling capacity of different cooling water chambers; moreover, sharing a cooling water connecting pipe can reduce the number of interfaces on the burner main body 1, thereby making the structure of the burner main body 1 simpler and the installation and disassembly more convenient.

[0031] Further, the fluid inlets of the first inlet pipe 4 and the second inlet pipe 5 are respectively arranged at the tail of the burner main body 1. A second flange 11 is arranged at the fluid inlet of the first inlet pipe 4, and a third flange 12 is arranged at the fluid inlet of the second inlet pipe 5; arranging the fluid inlets at the tail of the burner main body 1 makes the fluid inlets far away from the furnace body of the non-catalytic reformer on the premise of convenient installation. Since the fluids flowing in the fluid inlets and pipelines are all combustible or combustion-supporting gases, such as natural gas, oxygen, etc., it is therefore safer and more reliable; each flange is used for the butt joint and connection of each fluid inlet to the pipeline or source of combustible or combustion-supporting gas.

[0032] Furthermore, the fluid inlet direction of the first inlet pipe 4 is arranged axially, and the fluid inlet direction of the second inlet pipe 5 is arranged radially; the inlets of the first inlet pipe 4 and the second inlet pipe 5 are respectively arranged radially and axially, so that the installation positions of the first inlet pipe 4 and the second inlet pipe 5 are staggered, ensuring sufficient installation space and spacing, making the installation and disassembly more convenient and the operation safer.

[0033] Furthermore, a mixture of oxygen and steam flows in the first inlet pipe 4, and a mixture of natural gas and steam flows in the second inlet pipe 5.

[0034] Further, a burner installation flange 13 is provided on the outer wall of the outer cooling water pipe 3; the burner installation flange 13 is used to dock the burner head with the non-catalytic reformer. After fixing the position of the burner head, it is ensured that the front end of the first inlet pipe 4 wrapped by the inner cooling water pipe 2 extends into the non-catalytic reformer, the front end of the outer cooling water pipe 3 abuts against the outer wall of the non-catalytic reformer, and the front end of the second inlet pipe 5 is directly opposite the burner inlet on the non-catalytic reformer. It is necessary to ensure the seal between the outer ring of the second inlet pipe 5 and the outer wall of the non-catalytic reformer and ensure that the pipe orifices of the second inlet pipe 5 are evenly distributed in a circular shape on the outer circumference of the inner cooling water pipe 2, so that the normal temperature and high-pressure mixed gas ejected from the orifices of the second inlet pipe 5 forms a cylindrical fluid protection layer with a uniform thickness on the outer circumference of the inner cooling water pipe 2, thereby protecting the burner head in the furnace from directly contacting the high-temperature hot gas in the furnace.

[0035] Further, the first inlet pipe 4, the inner cooling water pipe 2, the second inlet pipe 5, and the outer cooling water pipe 3 are coaxial with the rotation axis; the coaxial arrangement ensures that the normal temperature and high-pressure mixed gas ejected from the orifices of the second inlet pipe 5 forms a cylindrical fluid protection layer with a uniform thickness on the outer circumference of the inner cooling water pipe 2, thereby extending the service life of the burner.

[0036] Embodiment

[0037] In this embodiment, for the non-catalytic reformer burner with stepped double water cooling, the burner head of the burner body 1 is fixedly docked to the burner inlet of the non-catalytic reformer through the burner installation flange 13, so that the front end of the first inlet pipe 4 wrapped by the inner cooling water pipe 2 extends into the non-catalytic reformer, the outer cooling water pipe 3 is located outside the furnace chamber of the non-catalytic reformer and its front end abuts against the outer wall of the non-catalytic reformer, and the front end of the second inlet pipe 5 is in the burner installation chamber and is directly opposite the burner inlet on the non-catalytic reformer.

[0038] Then, cooling water is introduced through the cooling water inlet connecting pipe 8. After entering the cooling water inlet connecting pipe 8, the cooling water is respectively diverted to the first cooling water chamber 6 and the second cooling water chamber 7. The first cooling water chamber 6 directly cools the outer wall of the first inlet pipe 4, and the first cooling water chamber 6 and the second cooling water chamber 7 jointly cool the second inlet pipe 5 in an inner and outer sandwiching manner.

[0039] Then, a mixed gas of oxygen and steam is introduced into the first inlet pipe 4 through the second flange 11, and a mixed gas of natural gas and steam is introduced into the second inlet pipe 5 through the third flange 12. The mixed gas of oxygen and steam is sprayed into the non-catalytic reformer in a cylindrical shape after passing through the wrapping section of the first cooling water chamber 6; the mixed gas of natural gas and steam is sprayed into the non-catalytic reformer in a cylindrical shape after being sandwiched by the first cooling water chamber 6 and the second cooling water chamber 7 inside and outside, and a cylindrical fluid protection layer is continuously formed outside the first cooling water chamber 6 due to inertia when initially entering the non-catalytic reformer.

[0040] Due to the continuous formation of a cylindrical fluid protection layer outside the first cooling water chamber 6, in the non-catalytic reformer, the first cooling water chamber 6 is no longer directly in contact with the high-temperature environment inside the furnace, while the second cooling water chamber 7 is directly located outside the non-catalytic reformer. Therefore, the front end of the entire burner body 1 is no longer directly in contact with the high-temperature environment inside the non-catalytic reformer, ensuring the working temperature of the front end of the non-catalytic reformer burner. Therefore, it can effectively prevent the cracking and damage of the outer layer cooling water structure of the burner caused by the backflow of high-temperature hot gas in the furnace.

[0041] In summary, the present utility model adopts an inner and outer double-layer water-cooling structure. The outer water-cooling structure and the inner water-cooling structure are sleeved in a stepped shaft shape. The inner water-cooling structure wraps the internal cylindrical fluid channel, and the inner and outer water-cooling structures clamp the external cylindrical fluid channel. Moreover, the axial length of the outer water-cooling structure is shorter than that of the inner water-cooling structure. When the burner is in use, the outer water-cooling structure is located outside the furnace chamber of the non-catalytic reformer, and the external cylindrical fluid channel is in the burner installation chamber, effectively preventing the cracking and damage of the outer layer cooling water structure of the burner caused by the backflow of high-temperature hot gas in the furnace. The present utility model extends the service life of the non-catalytic reformer burner and reduces the use cost of the burner. Therefore, the present utility model has a wide application prospect.

[0042] It should be emphasized that the above are only the preferred embodiments of the present utility model, and there is no any form of limitation to the present utility model. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still belong to the scope of the technical solution of the present utility model.

Claims

1. A stepped double water-cooled non-catalytic converter burner, comprising: A long cylindrical burner body (1), characterized in that: the head of the burner body (1) is in the shape of a stepped shaft with a thin front end and a thick rear end, the head of the burner body (1) is provided with a cylindrical inner cooling water pipe (2) and a cylindrical outer cooling water pipe (3), the outer cooling water pipe (3) is annularly sleeved outside the inner cooling water pipe (2), and the inner cooling water pipe (2) extends forward axially from the front end surface of the outer cooling water pipe (3); The inner cavity of the inner cooling water pipe (2) is provided with a first inlet pipe (4) along the axial direction, the fluid passage of the first inlet pipe (4) is cylindrical, a first cooling water cavity (6) is provided in the wall of the inner cooling water pipe (2), the first cooling water cavity (6) is cylindrical, and the first cooling water cavity (6) is annularly wrapped around the outer circumference of the first inlet pipe (4); cooling water circulates in the first cooling water cavity (6); A second cooling water chamber (7) is provided in the wall of the outer cooling water pipe (3), the second cooling water chamber (7) is cylindrical, and cooling water circulates in the second cooling water chamber (7); an annular second inlet pipe (5) is formed between the inner wall of the outer cooling water pipe (3) and the outer wall of the inner cooling water pipe (2); The fluid outlet of the first inlet pipe (4) is circular and arranged forward in the axial direction, and the fluid outlet of the second inlet pipe (5) is annular and arranged forward in a direction parallel to the axial direction.

2. A stepped double water-cooled non-catalytic converter burner as claimed in claim 1, characterized in that: The first cooling water chamber (6) and the second cooling water chamber (7) are both inner and outer double-layer cylindrical structures layered along the radial direction. The water inlet and outlet of the first cooling water chamber (6) and the water inlet and outlet of the second cooling water chamber (7) are respectively located in different layers of the inner and outer double-layer cylindrical structures. The inner and outer chambers of the inner and outer double-layer cylindrical structures are connected at one end of each pipeline close to the burner head.

3. A stepped double water-cooled non-catalytic converter burner as claimed in claim 2, characterized in that: The water inlet of the first cooling water chamber (6) and the water inlet of the second cooling water chamber (7) are respectively located in the inner layer of their respective inner and outer double-layer cylindrical structures, and the water outlet of the first cooling water chamber (6) and the water outlet of the second cooling water chamber (7) are respectively located in the outer layer of their respective inner and outer double-layer cylindrical structures.

4. A stepped double water-cooled non-catalytic converter burner as claimed in claim 2, characterized in that: The water inlet of the first cooling water chamber (6) and the water inlet of the second cooling water chamber (7) are respectively located in the outer layer of their respective inner and outer double-layer cylindrical structures, and the water outlet of the first cooling water chamber (6) and the water outlet of the second cooling water chamber (7) are respectively located in the inner layer of their respective inner and outer double-layer cylindrical structures.

5. A stepped double water-cooled non-catalytic converter burner as claimed in claim 2, characterized in that: The water inlet of the first cooling water chamber (6) and the water inlet of the second cooling water chamber (7) are respectively connected to the cooling water inlet pipe (8), and the water outlet of the first cooling water chamber (6) and the water outlet of the second cooling water chamber (7) are respectively connected to the cooling water outlet pipe (9). The cooling water inlet pipe (8) and the cooling water outlet pipe (9) are respectively fixedly arranged on the side wall of the burner body (1), and the first flange (10) is respectively provided at the pipe opening of the cooling water inlet pipe (8) and the cooling water outlet pipe (9).

6. A stepped double water-cooled non-catalytic converter burner as claimed in claim 1, characterized in that: The fluid inlet of the first inlet pipe (4) and the fluid inlet of the second inlet pipe (5) are respectively arranged at the rear of the burner body (1); the fluid inlet of the first inlet pipe (4) is provided with a second flange (11), and the fluid inlet of the second inlet pipe (5) is provided with a third flange (12).

7. A stepped double water-cooled non-catalytic converter burner as claimed in claim 6, characterized in that: The fluid inlet direction of the first inlet pipe (4) is arranged in the axial direction, and the fluid inlet direction of the second inlet pipe (5) is arranged in the radial direction.

8. A stepped double water-cooled non-catalytic converter burner as claimed in claim 6, characterized in that: A mixed gas of oxygen and steam flows through the first inlet pipe (4), and a mixed gas of natural gas and steam flows through the second inlet pipe (5).

9. A stepped double water-cooled non-catalytic converter burner as claimed in claim 1, characterized in that: A burner mounting flange (13) is provided on the outer wall of the external cooling water pipe (3).

10. A stepped double water-cooled non-catalytic converter burner as claimed in claim 1, characterized in that: The first inlet pipe (4), the inner cooling water pipe (2), the second inlet pipe (5) and the outer cooling water pipe (3) rotate on the same axis.

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