A burner suitable for mixed combustion of multiple fuels

Abstract

The invention discloses a burner suitable for mixed combustion of multiple fuels, which is used in the technical field of burners and comprises: a first gas pipe, one end of which is provided with a first combustible gas inlet, and the other end of which is provided with a first combustible gas outlet; a first combustion-supporting gas sleeve, which is sleeved outside the first gas pipe and forms a first combustion-supporting gas channel with the first gas pipe; a second combustion-supporting gas sleeve, which is sleeved outside the first combustion-supporting gas sleeve and forms a second combustion-supporting gas channel with the first combustion-supporting gas sleeve; a third combustion-supporting gas sleeve, which is sleeved outside the second combustion-supporting gas sleeve and forms a third combustion-supporting gas channel with the second combustion-supporting gas sleeve; the second gas pipe, one end of which is provided with a second combustible gas outlet on the second gas pipe is arranged close to the side wall of the second combustion-supporting gas sleeve; the third gas pipe, the combustible gas ejected from the three combustible gas outlets is combusted by the combustion-supporting gas of the third combustion-supporting gas channel. The burner is suitable for stable mixed combustion of multiple fuels.

Description

Technical Field

[0001] The invention relates to the technical field of burners, and in particular to a burner suitable for mixed combustion of multiple fuels. Background Art

[0002] Burners are widely used in high-temperature manufacturing to convert the chemical energy of fuel into thermal energy. In the field of high-temperature manufacturing, there is an urgent need to develop efficient and stable combustion technology for low-carbon and zero-carbon fuels.

[0003] Most of the carbon dioxide emitted by the high-temperature manufacturing industry is produced when burning fossil fuels. Therefore, replacing the original fossil fuels with advanced zero-carbon fuels is one of the most direct and effective ways to reduce carbon emissions. At present, the only optional zero-carbon fuels are hydrogen and ammonia. However, hydrogen is difficult to store and transport, which makes it difficult to use hydrogen as an industrial fuel on a large scale. Ammonia has many advantages over hydrogen. What is particularly important is that ammonia can be stored and transported in large volumes, and the cost is much lower than that of hydrogen storage and transportation. The fuel economy of ammonia is significantly better than that of hydrogen fuel, but ammonia is not easy to ignite or burn, and it will produce fuel-type nitrogen oxides (NOx) when burned at high temperatures.

[0004] Therefore, the development of a burner that can stably burn non-combustible combustible gases is of great significance to the high-temperature manufacturing industry. Summary of the invention

[0005] The object of the present invention is to provide a burner suitable for the mixed combustion of multiple fuels, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0006] The technical solutions adopted to solve the above technical problems are:

[0007] The present invention provides a burner suitable for mixed combustion of multiple fuels, comprising:

[0008] a first gas pipe, the first gas pipe being used to guide combustible gas;

[0009] a first combustion-supporting gas sleeve, which is sleeved outside the first gas pipe and forms a first combustion-supporting gas channel with the first gas pipe;

[0010] a second combustion-supporting gas sleeve, wherein the second combustion-supporting gas sleeve is sleeved outside the first combustion-supporting gas sleeve and forms a second combustion-supporting gas channel with the first combustion-supporting gas sleeve;

[0011] a third combustion-supporting gas sleeve, wherein the third combustion-supporting gas sleeve is sleeved outside the second combustion-supporting gas sleeve and forms a third combustion-supporting gas channel between the third combustion-supporting gas sleeve and the second combustion-supporting gas sleeve;

[0012] a second gas pipe, the second gas pipe being used for guiding the combustible gas, the second gas pipe being arranged close to the side wall of the second combustion-supporting gas sleeve, so that the combustible gas ejected from the second gas pipe is combusted by the combustion-supporting gas in the third combustion-supporting gas channel and heats the combustion-supporting gas in the third combustion-supporting gas channel;

[0013] The third gas pipe is used to guide the combustible gas, and the combustible gas ejected from the third gas pipe is combusted by the combustion-supporting gas of the third combustion-supporting gas channel.

[0014] As a further improvement of the above technical solution, a first combustible gas inlet and a first combustible gas outlet are respectively provided at both ends of the first gas pipe, and a jet is also provided at the end of the first gas pipe where the first combustible gas outlet is provided, and the first combustible gas outlet is closer to the first combustible gas inlet than the jet; the first combustible gas outlet is provided on the radial side wall of the first gas pipe, and the first combustible gas outlet includes a plurality of jet holes, one end of the jet holes is connected to the interior of the first gas pipe, and the other end of the jet holes is connected to the outside; the outer diameter of the jet body gradually increases along the axial direction of the first gas pipe toward the gas injection direction of the first combustion-supporting gas sleeve, so that an annular guide wall is formed on the outer periphery of the jet body.

[0015] As a further improvement of the above technical solution, the jet through hole is arranged obliquely from inside to outside along the radial direction of the first gas pipe and faces the first combustion-supporting gas channel.

[0016] As a further improvement of the above technical solution, the first combustion-supporting gas channel accommodates a primary wind swirl blade, and the primary wind swirl blade includes a plurality of first axial jet holes and a plurality of blade units. The plurality of first axial jet holes are distributed at intervals and surround the periphery of the first gas pipe. The plurality of blade units are distributed at intervals and surround the periphery of the first gas pipe. A primary wind outlet is formed between two adjacent blade units. The first axial jet holes and the blade units are distributed sequentially from the inside to the outside along the radial direction of the first gas pipe.

[0017] As a further improvement of the above technical solution, the guide wall is a curved surface structure, and the curvature of the outer diameter of the ejection body gradually decreases as it increases along the axial direction of the first gas pipe toward the outlet direction of the first combustion-supporting gas sleeve.

[0018] As a further improvement of the above technical solution, the second combustion-supporting gas channel is provided with secondary wind swirl blades, and the third combustion-supporting gas channel is provided with tertiary wind swirl blades.

[0019] As a further improvement of the above technical solution, the second combustible gas outlet of the second gas pipe is arranged close to the inner wall of the second combustion-supporting gas sleeve.

[0020] As a further improvement of the above technical solution, a plurality of second gas pipes are provided, and the plurality of second gas pipes are distributed at intervals in the circumferential direction around the second combustion-supporting gas sleeve.

[0021] As a further improvement of the above technical solution, there are multiple third gas pipes, which are distributed at intervals around the circumference of the third combustion-supporting gas sleeve, and the diameter of the outlet end of the third gas pipe is smaller than the diameter of the conveying section of the third gas pipe.

[0022] As a further improvement of the above technical solution, the burner suitable for mixed combustion of multiple fuels is provided with a first annular cover, the first annular cover is arranged around the outer periphery of the third combustion-supporting gas sleeve, the first annular cover has a first combustible gas delivery inlet, a first annular delivery channel and a plurality of first combustible gas delivery outlets, the first combustible gas delivery inlet, the first annular delivery channel and the first combustible gas delivery outlet are connected in sequence, and the plurality of first combustible gas delivery outlets are connected one by one with the plurality of second gas pipes;

[0023] The burner suitable for the mixed combustion of multiple fuels is provided with a second annular cover, which is arranged around the outer periphery of the third combustion-supporting gas sleeve and is connected to the side of the first annular cover away from the third gas pipe. The second annular cover has a second combustible gas inlet, a second annular conveying channel and a plurality of second combustible gas outlets. The second combustible gas inlet, the second annular conveying channel and the second combustible gas outlet are connected in sequence, and the plurality of second combustible gas outlets are connected one by one with the plurality of third gas pipes.

[0024] The beneficial effects of the present invention are:

[0025] The first combustion-supporting gas sleeve is used to sleeve the first gas pipe, and a first combustion-supporting gas channel is formed between the first gas pipe, so that the combustible gas and the combustion-supporting gas are fully in contact, so that the combustible gas ejected from the first gas pipe can ignite quickly and stably. The second combustion-supporting gas sleeve is sleeved outside the first combustion-supporting gas sleeve, and a second combustion-supporting gas channel is formed between the first combustion-supporting gas sleeve, and one end of the second gas pipe where the second combustion gas outlet is arranged is arranged close to the side wall of the second combustion-supporting gas sleeve, so that the combustion gas ejected from the second combustion gas outlet is assisted by the combustion gas in the third combustion-supporting gas channel and heats the combustion gas in the third combustion-supporting gas channel; on the one hand, the combustion gas in the second gas pipe can achieve high-range combustion of the flame, thereby effectively reducing the temperature of the furnace and preventing the furnace from being burned by high temperature; on the other hand, based on the second gas pipe being close to the combustion-supporting gas in the third combustion-supporting gas channel, the heat generated when the combustion of the combustion gas in the second gas pipe is carried out can heat the combustion gas in the third combustion-supporting gas channel, thereby making the combustion gas ejected from the third gas pipe easier to ignite when assisted by the combustion gas in the third combustion-supporting gas channel, and burning more stably, even if the combustion gas in the third gas pipe is a combustible gas that is not easy to ignite. In addition, flammable gases that are not easy to ignite include ammonia. Compared with hydrogen, ammonia is easier to store and transport; compared with methane, burning ammonia reduces carbon dioxide emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0027] Figure 1 This is a structural schematic diagram of a burner suitable for mixed combustion of multiple fuels provided by the present invention;

[0028] Figure 2 yes Figure 1 A schematic diagram of a connection structure between a first fuel gas pipe and a first combustion-supporting gas sleeve of a burner suitable for mixed combustion of multiple fuels;

[0029] Figure 3 yes Figure 1 A gas flow diagram of a burner suitable for mixed combustion of multiple fuels.

[0030] In the figure: 100, first fuel gas pipe; 101, first combustible gas inlet; 102, first combustible gas outlet; 1021, jet hole; 200, first combustion-supporting gas sleeve; 201, first combustion-supporting gas channel; 300, second combustion-supporting gas sleeve; 301, second combustion-supporting gas channel; 400, third combustion-supporting gas sleeve; 401, third combustion-supporting gas channel; 500, second fuel gas pipe; 501, second combustible gas inlet; 502, second combustible gas outlet; 600, third fuel gas pipe; 601, third Combustible gas inlet; 602, third combustible gas outlet; 700, injection body; 701, guide wall; 800, primary air swirl blade; 801, first axial jet hole; 802, blade unit; 8021, primary air outlet; 900, secondary air swirl blade; 110, tertiary air swirl blade; 120, first annular cover; 121, first combustible gas inlet; 122, first annular conveying channel; 130, second annular cover; 131, second combustible gas inlet; 132, second annular conveying channel. DETAILED DESCRIPTION

[0031] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Reference Figures 1 to 3 The present invention provides a burner suitable for mixed combustion of multiple fuels as follows:

[0036] A burner suitable for mixed combustion of multiple fuels comprises:

[0037] The first gas pipe 100 is used to guide the combustible gas. The combustible gas in the first gas pipe 100 is generally a combustible gas that is easy to ignite, such as methane and hydrogen. A first combustible gas inlet 101 is provided at one end of the first gas pipe 100, and a first combustible gas outlet 102 is provided at the other end of the first gas pipe 100. Figure 1 The gas flows from bottom to top. The first gas pipe 100 may be a round pipe or a square pipe, or a special-shaped pipe.

[0038] The first combustion-supporting gas sleeve 200 is sleeved outside the first gas pipe 100 and forms a first combustion-supporting gas channel 201 with the first gas pipe 100. The first combustion-supporting gas sleeve 200 can be a round tube or a square tube, or a special-shaped tube.

[0039] The second combustion-supporting gas sleeve 300 is sleeved outside the first combustion-supporting gas sleeve 200 and forms a second combustion-supporting gas channel 301 with the first combustion-supporting gas sleeve 200. The second combustion-supporting gas sleeve 300 can be a round tube or a square tube, and can also be a special-shaped tube.

[0040] The third combustion-supporting gas sleeve 400 is sleeved outside the second combustion-supporting gas sleeve 300 and forms a third combustion-supporting gas channel 401 with the second combustion-supporting gas sleeve 300. The third combustion-supporting gas sleeve 400 can be a round tube or a square tube, and can also be a special-shaped tube.

[0041] The second gas pipe 500 is used to guide the combustible gas. The combustible gas in the second gas pipe 500 is generally a combustible gas that is easy to ignite, such as methane and hydrogen. A second combustible gas inlet 501 is provided at one end of the second gas pipe 500, and a second combustible gas outlet 502 is provided at the other end of the second gas pipe 500. Figure 1 The upper end of the second combustible gas outlet 502 is arranged close to the side wall of the second combustion-supporting gas sleeve 300, so that the combustible gas ejected from the second combustible gas outlet 502 is combusted by the combustion-supporting gas in the third combustion-supporting gas channel 401 and heats the combustion-supporting gas in the third combustion-supporting gas sleeve 400. The second gas pipe 500 may be a round pipe or a square pipe, and of course may also be a special-shaped pipe.

[0042] The third gas pipe 600 is used to guide the combustible gas. The combustible gas in the third gas pipe 600 is generally difficult to ignite, but it is easy to store and transport, so it is used as the main combustion gas, such as ammonia. Burning ammonia for heating can reduce the emission of carbon dioxide. A third combustible gas inlet 601 is provided at one end of the third gas pipe 600, and a third combustible gas outlet 602 is provided at the other end of the third gas pipe 600. The combustible gas ejected from the third combustible gas outlet 602 is assisted by the combustion gas of the third combustion-supporting gas channel 401. The third gas pipe 600 can be a round tube or a square tube, and of course it can also be a special-shaped tube.

[0043] During operation, the first gas pipe 100 outputs a combustible gas that is easy to ignite (such as methane or hydrogen), and the first combustion-supporting gas channel 201 outputs air or oxygen, that is, the combustible gas that is easy to ignite in the first gas pipe 100 is ignited by an igniter, and then the heat is radially transferred to the second combustion-supporting gas channel 301 and the surrounding of the second gas pipe 500. The combustible gas ejected from the second gas pipe 500 can eject the combustible gas upward, and combined with the air or oxygen ejected from the second combustion-supporting gas channel 301, the flame has a high range to prevent the high-temperature flame from burning a burner suitable for mixed combustion of multiple fuels (that is, to prevent the furnace from being burned due to high temperature). With the assistance of the combustion heat of the combustible gas in the second gas pipe 500, combined with the air or oxygen in the third combustion-supporting gas channel 401 to assist combustion, the combustible gas (generally a gas that is not easy to ignite, such as ammonia) ejected from the third gas pipe 600 is ignited.

[0044] Therefore, the first combustion-supporting gas sleeve 200 is sleeved on the first gas pipe 100, and a first combustion-supporting gas channel 201 is formed between the first gas pipe 100 and the first combustion-supporting gas sleeve 200, so that the combustible gas is in full contact with the combustion-supporting gas, so that the combustible gas ejected from the first gas pipe 100 can be ignited quickly and stably. The second combustion-supporting gas sleeve 300 is sleeved on the outside of the first combustion-supporting gas sleeve 200, and a second combustion-supporting gas channel 301 is formed between the first combustion-supporting gas sleeve 200, and one end of the second gas pipe 500 where the second combustion gas outlet 502 is arranged is arranged against the side wall of the second combustion-supporting gas sleeve 300, so that the combustible gas ejected from the second combustion-supporting gas outlet 502 is assisted by the combustion-supporting gas in the third combustion-supporting gas channel 401, and the combustion-supporting gas in the third combustion-supporting gas channel 401 is heated; on the one hand, the combustible gas in the second gas pipe 500 can be ignited. The high-range combustion of the flame can effectively reduce the temperature of the furnace and prevent the furnace from being burned by high temperature; on the other hand, based on the second gas pipe 500 being close to the combustion-supporting gas in the third combustion-supporting gas channel 401, the heat generated when the combustible gas in the second gas pipe 500 is burned can heat the combustion-supporting gas in the third combustion-supporting gas channel 401, thereby making the combustible gas ejected by the third gas pipe 600 easier to ignite and burn more stably when the combustion is assisted by the combustion-supporting gas in the third combustion-supporting gas channel 401, even if the combustible gas in the third gas pipe 600 is a combustible gas that is not easy to ignite. In addition, the combustible gases that are not easy to ignite include ammonia, etc. Compared with hydrogen, ammonia is easier to store and transport; compared with methane, burning ammonia reduces the emission of carbon dioxide. In addition, the combustible gas ejected based on the third gas pipe 600 is far away from the furnace, thereby preventing ammonia from being burned at high temperature, thereby reducing the generation of nitrogen oxides.

[0045] As a further improvement of the above technical solution, a jet body 700 is also provided at one end of the first gas pipe 100 where the first combustible gas outlet 102 is provided, and the first combustible gas outlet 102 is closer to the first combustible gas inlet 101 than the jet body 700; the first combustible gas outlet 102 is provided on the radial side wall of the first gas pipe 100, and the first combustible gas outlet 102 includes a plurality of jet holes 1021, one end of the jet holes 1021 is connected to the inside of the first gas pipe 100, and the other end of the jet holes 1021 is connected to the outside; the outer diameter of the jet body 700 gradually increases along the axial direction of the first gas pipe 100 toward the gas injection direction of the first combustion-supporting gas sleeve 200, so that an annular guide wall 701 is formed on the outer periphery of the jet body 700. In this way, under the guidance of the guide wall 701, the path of the gas is Figure 3As shown, after the combustible gas in the first gas pipe 100 is ejected from the jet through hole 1021, it is fully mixed with the air ejected from the first combustion-supporting gas channel 201, so that the gas can be fully mixed, making it easier for the combustible gas to ignite. Since the jet through hole 1021 is not set on the guide wall 701, the guide wall 701 guides the gas more smoothly without turbulence, so that the combustible gas ejected from the first gas pipe 100 is burned more stably. In other embodiments, the first combustible gas outlet 102 can be an annular opening, and only one, two or a small number of them need to be set.

[0046] As a further improvement of the above technical solution, the jet through hole 1021 is arranged along the radial direction of the first gas pipe 100 from inside to outside and is inclined toward the first combustion-supporting gas channel 201. In this way, when the combustible gas in the first gas pipe 100 is ejected along the jet through hole 1021, the flow direction is opposite to that of the air ejected from the first combustion-supporting gas channel 201 (see Figure 3 ), causing the gases to collide and mix violently, making it easier to ignite the combustible gas, and thus easier to achieve rapid and stable ignition.

[0047] As a further improvement of the above technical solution, the first combustion-supporting gas channel 201 contains a primary wind swirl blade 800, and the primary wind swirl blade 800 includes a plurality of first axial jet holes 801 and a plurality of blade units 802, the plurality of first axial jet holes 801 are distributed at intervals and surround the periphery of the first gas pipe 100, the plurality of blade units 802 are distributed at intervals and surround the periphery of the first gas pipe 100, a primary wind outlet 8021 is formed between two adjacent blade units 802, and the first axial jet holes 801 and the blade units 802 are distributed in sequence from inside to outside along the radial direction of the first gas pipe 100. In this way, after being guided by the blade units 802, a primary swirl wind with a certain tangential velocity is generated, and the primary swirl wind can generate a vortex to improve the mixing degree of the primary swirl wind and the combustible gas ejected from the first gas pipe 100, thereby realizing lean combustion of gases such as methane and hydrogen, and avoiding excessive high-temperature combustion of ammonia, thereby reducing the generation of nitrogen oxides. In addition, the first axial jet hole 801 sprays air in a direction, so that the combustible gas can not only be fully mixed with the air, but also realize a parabola-like flow direction (i.e., return to the top of the jet body 700) after being guided by the guide wall 701 of the jet body 700 and under the guidance of a swirl wind, thereby realizing the reflux of high-temperature flue gas during combustion, which is more conducive to the stable and complete combustion of the combustible gas.

[0048] As a further improvement of the above technical solution, the guide wall 701 is a curved surface structure, and the curvature of the outer diameter of the ejector 700 gradually decreases along the axial direction of the first gas pipe 100 toward the outlet direction of the first combustion-supporting gas sleeve 200. In this way, when the primary swirl wind passes through the guide wall 701, the curved surface structure has less resistance to the primary swirl wind, so that the gas mixing process is smoother. In other embodiments, the guide wall 701 can be a planar structure.

[0049] As a further improvement of the above technical solution, the second combustion-supporting gas channel 301 is provided with a secondary wind swirl blade 900, and the third combustion-supporting gas channel 401 is provided with a tertiary wind swirl blade 110. In this way, the air in the second combustion-supporting gas channel 301 is guided by the secondary wind swirl blade 900, so that the combustible gas in the second gas pipe 500 is more fully mixed with the air sprayed from the second combustion-supporting gas channel 301 after being sprayed; and the air in the third combustion-supporting gas channel 401 is guided by the tertiary wind swirl blade 110, so that the combustible gas in the third gas pipe 600 is more fully mixed with the air sprayed from the third combustion-supporting gas channel 401 after being sprayed. In this way, the combustible gas sprayed from the second gas pipe 500 and the combustible gas sprayed from the third gas pipe 600 are ignited more stably and keep burning more stably.

[0050] As a further improvement of the above technical solution, one end of the second combustible gas outlet 502 provided on the second gas pipe 500 is arranged close to the inner wall of the second combustion-supporting gas sleeve 300. In this way, the combustible gas ejected from the second gas pipe 500 is mainly assisted in combustion by the air ejected from the second combustion-supporting gas channel 301, and secondly assisted in combustion by the air ejected from the third combustion-supporting gas channel 401. In other embodiments, one end of the second combustible gas outlet 502 provided on the second gas pipe 500 is arranged close to the outer wall of the second combustion-supporting gas sleeve 300 (i.e., located in the third combustion-supporting gas channel 401).

[0051] As a further improvement of the above technical solution, a plurality of second gas pipes 500 are provided, and the plurality of second gas pipes 500 are distributed at intervals around the circumference of the second combustion-supporting gas sleeve 300. In this way, the second combustion-supporting gas sleeve 300 can be set as a small-caliber structure, so that even if the combustible gas in the second gas pipe 500 is in a low-pressure and low-flow state, the combustible gas can be sprayed at a high range to protect the furnace. In addition, the plurality of second gas pipes 500 are distributed in an annular shape, which helps the combustible gas to be sprayed into the furnace more evenly, and avoids the combustible gas sprayed from the second gas pipe 500 from being unevenly distributed along the circumference of the second combustion-supporting gas sleeve 300, resulting in unstable combustion effect.

[0052] As a further improvement of the above technical solution, the third gas pipe 600 is provided with a plurality of them, and the plurality of the third gas pipes 600 are distributed at intervals around the circumference of the third combustion-supporting gas sleeve 400, and the caliber of the outlet end of the third gas pipe 600 is smaller than the caliber of the conveying section of the third gas pipe 600. In this way, the third gas pipe 600 also realizes high-range injection, so that the first gas pipe 100, the second gas pipe 500, and the third gas pipe 600 can more easily realize the three-level flame propagation in sequence from the inside to the outside, and each level has its own air source, so it can be self-stable, and thus it is also suitable for stable combustion under different fuels and different loads, especially allowing the combustible gas in the third gas pipe 600 to be a combustible gas that is not easy to ignite. In addition, the plurality of third gas pipes 600 are distributed in an annular shape, which helps the combustible gas to be sprayed into the furnace more evenly, and avoids the combustible gas sprayed by the third gas pipe 600 from being unevenly distributed along the circumference of the third combustion-supporting gas sleeve 400, resulting in unstable combustion effect.

[0053] As a further improvement of the above technical solution,

[0054] The burner suitable for mixed combustion of multiple fuels is provided with a first annular cover 120, the first annular cover 120 is arranged around the outer periphery of the third combustion-supporting gas sleeve 400, the first annular cover 120 has a first combustible gas inlet 121, a first annular conveying channel 122 and a plurality of first combustible gas outlets, the first combustible gas inlet 121, the first annular conveying channel 122 and the first combustible gas outlets are connected in sequence, and the plurality of first combustible gas outlets are connected one by one with the plurality of second gas pipes 500. In this way, the first annular conveying channel 122 is connected with the plurality of first combustible gas outlets, so that combustible gas can be supplied to the plurality of second gas pipes 500 through one or a few first combustible gas inlets 121.

[0055] The burner suitable for mixed combustion of multiple fuels is provided with a second annular cover 130, the second annular cover 130 is arranged around the outer periphery of the third combustion-supporting gas sleeve 400, and is connected to the first annular cover 120 on the side away from the third gas pipe 600, the second annular cover 130 has a second fuel gas inlet 131, a second annular conveying channel 132 and a plurality of second fuel gas outlets, the second fuel gas inlet 131, the second annular conveying channel 132 and the second fuel gas outlets are connected in sequence, and the plurality of second fuel gas outlets are connected one by one with the plurality of third gas pipes 600. In this way, the second annular conveying channel 132 is connected with the plurality of second fuel gas outlets, so that the fuel gas can be supplied to the plurality of third gas pipes 600 through one or a few second fuel gas inlets 131. In addition, since the second annular cover 130 is arranged around the periphery of the third combustion-supporting gas sleeve 400 and is connected to the side of the first annular cover 120 away from the third gas pipe 600, that is, located at the bottom of the first annular cover 120, the layout of the first annular cover 120 and the second annular cover 130 saves more space.

[0056] It can be understood that a burner suitable for the mixed combustion of multiple fuels is suitable for treating multiple mixed exhaust gases that are not easy to burn stably.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the present invention have been shown and described, a person skilled in the art may make various changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention. These changes, modifications, equivalent variations or substitutions are all included in the scope defined by the claims of this application. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A burner suitable for mixed combustion of multiple fuels, characterized in that: include: a first gas pipe, the first gas pipe being used to guide combustible gas; a first combustion-supporting gas sleeve, which is sleeved outside the first gas pipe and forms a first combustion-supporting gas channel with the first gas pipe; a second combustion-supporting gas sleeve, wherein the second combustion-supporting gas sleeve is sleeved outside the first combustion-supporting gas sleeve and forms a second combustion-supporting gas channel with the first combustion-supporting gas sleeve; a third combustion-supporting gas sleeve, wherein the third combustion-supporting gas sleeve is sleeved outside the second combustion-supporting gas sleeve and forms a third combustion-supporting gas channel between the third combustion-supporting gas sleeve and the second combustion-supporting gas sleeve; a second gas pipe, the second gas pipe being used for guiding the combustible gas, the second gas pipe being arranged close to the side wall of the second combustion-supporting gas sleeve, so that the combustible gas ejected from the second gas pipe is combusted by the combustion-supporting gas in the third combustion-supporting gas channel and heats the combustion-supporting gas in the third combustion-supporting gas channel; a third gas pipe, the third gas pipe being used to guide the combustible gas, the combustible gas ejected from the third gas pipe being combusted by the combustion-supporting gas of the third combustion-supporting gas channel; A first combustible gas inlet and a first combustible gas outlet are respectively provided at both ends of the first gas pipe, and a jet body is also provided at one end of the first gas pipe where the first combustible gas outlet is provided, and the first combustible gas outlet is closer to the first combustible gas inlet than the jet body; the first combustible gas outlet is provided on the radial side wall of the first gas pipe, and the first combustible gas outlet includes a plurality of jet through holes, one end of the jet through hole is connected to the interior of the first gas pipe, and the other end of the jet through hole is connected to the outside; the outer diameter of the jet body gradually increases along the axial direction of the first gas pipe toward the gas injection direction of the first combustion-supporting gas sleeve, so that an annular guide wall is formed on the periphery of the jet body; The gas injection through hole is arranged obliquely from inside to outside along the radial direction of the first gas pipe and faces the first combustion-supporting gas channel; The guide wall is a curved surface structure, and the curvature of the outer diameter of the ejector increases gradually along the axial direction of the first gas pipe toward the outlet direction of the first combustion-supporting gas sleeve.

2. The burner according to claim 1, characterized in that: The first combustion-supporting gas channel accommodates a primary wind swirl blade, which includes a plurality of first axial jet holes and a plurality of blade units. The plurality of first axial jet holes are distributed at intervals and surround the periphery of the first gas pipe. The plurality of blade units are distributed at intervals and surround the periphery of the first gas pipe. A primary wind outlet is formed between two adjacent blade units. The first axial jet holes and the blade units are distributed sequentially from the inside to the outside along the radial direction of the first gas pipe.

3. The burner according to claim 1, characterized in that: The second combustion-supporting gas channel is provided with secondary wind swirl blades, and the third combustion-supporting gas channel is provided with tertiary wind swirl blades.

4. The burner according to claim 1, characterized in that: The second combustible gas outlet of the second gas pipe is arranged close to the inner wall of the second combustion-supporting gas sleeve.

5. The burner according to claim 1, characterized in that: There are a plurality of second gas pipes, and the plurality of second gas pipes are distributed at intervals in the circumferential direction around the second combustion-supporting gas sleeve.

6. The burner according to claim 5, characterized in that: There are multiple third gas pipes, which are distributed at intervals around the circumference of the third combustion-supporting gas sleeve, and the diameter of the outlet end of the third gas pipe is smaller than the diameter of the conveying section of the third gas pipe.

7. The burner according to claim 5, characterized in that: The burner suitable for mixed combustion of multiple fuels is provided with a first annular cover, the first annular cover is arranged around the outer periphery of the third combustion-supporting gas sleeve, the first annular cover has a first combustible gas delivery inlet, a first annular delivery channel and a plurality of first combustible gas delivery outlets, the first combustible gas delivery inlet, the first annular delivery channel and the first combustible gas delivery outlets are connected in sequence, and the plurality of first combustible gas delivery outlets are connected one by one with a plurality of the second gas pipes; The burner suitable for the mixed combustion of multiple fuels is provided with a second annular cover, which is arranged around the outer periphery of the third combustion-supporting gas sleeve and is connected to the side of the first annular cover away from the third gas pipe. The second annular cover has a second combustible gas inlet, a second annular conveying channel and a plurality of second combustible gas outlets. The second combustible gas inlet, the second annular conveying channel and the second combustible gas outlet are connected in sequence, and the plurality of second combustible gas outlets are connected one by one with the plurality of third gas pipes.

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