Spray gun and combustor

Abstract

The utility model discloses a spray gun and a burner, and relates to the technical field of float glass melting furnaces. The spray gun comprises a fuel supply unit, a combustion-supporting medium supply unit and a gas output unit; the fuel supply unit is provided with at least two gas inlet passages for introducing different fuels respectively; the combustion-supporting medium supply unit is connected with the fuel supply unit and is provided with a combustion-supporting gas passage for introducing combustion-supporting gas; the gas output unit is connected with the combustion-supporting medium supply unit and provided with a mixed gas channel communicating with the gas inlet channel and the combustion-supporting gas channel, and the output end of the mixed gas channel is suitable for stretching into the kiln so as to be used for spraying mixed gas to the kiln. According to the combustor spray gun, multi-fuel mixed combustion is achieved, high-purity oxygen is used as a combustion-supporting medium, a combustor provides a fuel supply mode of mixed combustion of various gaseous fuels, and the combustion effect of various flame sections can be achieved through an oxygen supply selection device of the combustor.

Description

Technical Field

[0001] The utility model relates to the technical field of float glass melting furnace, in particular to a spray gun and a burner. Background Art

[0002] Most existing spray guns are in the form of single fuel supply, such as: spray guns for natural gas, spray guns for heavy oil, spray guns for hydrogen, etc.

[0003] Among them, natural gas spray guns and heavy oil spray guns can only use carbon-containing fuels when in use, and the burners equipped with such spray guns have high carbon emissions. Hydrogen spray guns use hydrogen as fuel when in use, which can reduce carbon emissions, but the flame radiation formed by hydrogen combustion is low, and the intense combustion reaction of hydrogen causes the spray gun flame to be short, which cannot heat the melt well.

[0004] In view of this, it is necessary to design a spray gun that has both carbon reduction and heating effects. Utility Model Content

[0005] The main purpose of the utility model is to provide a spray gun and a burner, aiming to reduce carbon emissions while improving the effect of heating a molten material.

[0006] To achieve the above object, the utility model provides a spray gun, comprising:

[0007] The fuel supply unit is provided with at least two air intake passages for respectively introducing different fuels;

[0008] a combustion-supporting medium supply unit, connected to the fuel supply unit and provided with a combustion-supporting gas passage for introducing the combustion-supporting gas; and

[0009] A gas output unit is connected to the combustion-supporting medium supply unit, and the gas output unit is provided with a mixed gas passage which is respectively connected to the air intake passage and the combustion-supporting gas passage, and the output end of the mixed gas passage is suitable for extending into the kiln to be used for spraying the mixed gas into the kiln.

[0010] Optionally, the fuel supply unit includes a first air inlet pipe, a second air inlet pipe and a third air inlet pipe, the air inlet end of the first air inlet pipe is used to introduce a first fuel, the air inlet end of the second air inlet pipe is used to introduce a second fuel, the air inlet end of the third air inlet pipe is used to introduce a third fuel, and the outlet ends of the second air inlet pipe and the third air inlet pipe are respectively connected to the first air inlet pipe.

[0011] Optionally, the air intake end of the first air intake pipe is provided with a first inlet connection structure suitable for externally connecting to a first fuel supply device, the air intake end of the second air intake pipe is provided with a second inlet connection structure suitable for externally connecting to a second fuel supply device, and the air intake end of the third air intake pipe is provided with a third inlet connection structure suitable for externally connecting to a third fuel supply device.

[0012] Optionally, the fuel supply unit also includes a gas sealing tube and a gas mixing tube, one end of the gas sealing tube is connected to the gas outlet end of the first air inlet pipe, and the other end of the gas sealing tube is connected to the gas mixing tube, and the gas mixing tube is inserted into the mixed gas passage through the combustion-supporting gas passage.

[0013] Optionally, the fuel supply unit and the combustion-supporting medium supply unit can slide relative to each other to change the relative position of the mixing pipe in the mixed gas passage to change the contact position of the fuel and oxygen.

[0014] Optionally, the combustion-supporting medium supply unit includes an oxygen inlet pipe, an oxygen primary selection device, an upper oxygen supply pipe, an oxygen central supply pipe and an oxygen lower supply pipe, the inlet end of the oxygen inlet pipe is used to introduce combustion-supporting gas, the outlet end of the oxygen inlet pipe is connected to the oxygen primary selection device, the oxygen primary selection device has a first outlet end, a second outlet end and a third outlet end, the first outlet end of the oxygen primary selection device is connected to the inlet end of the oxygen central supply pipe, the second outlet end of the oxygen primary selection device is connected to the inlet end of the upper oxygen supply pipe, the third outlet end of the oxygen primary selection device is connected to the inlet end of the lower oxygen supply pipe, and the outlet ends of the upper oxygen supply pipe, the oxygen central supply pipe and the lower oxygen supply pipe are respectively connected to the gas output unit;

[0015] The oxygen primary selection device is used to control the oxygen to enter the oxygen upper gas supply pipe, the oxygen central gas supply pipe or the oxygen lower gas supply pipe to adjust the flame cross-sectional shape.

[0016] Optionally, the combustion-supporting medium supply unit further includes a first upper air supply pipe, a second upper air supply pipe and an oxygen secondary selection device, the gas outlet end of the upper oxygen supply pipe is connected to the oxygen secondary selection device, the oxygen secondary selection device has a first gas outlet end and a second gas outlet end, the first gas outlet end of the oxygen secondary selection device is connected to the first upper air supply pipe, the second gas outlet end of the oxygen secondary selection device is connected to the second upper air supply pipe, the upper two sides of the gas output unit are provided with a first through hole and a second through hole respectively connected to the kiln, the gas outlet ends of the first upper air supply pipe and the second upper air supply pipe are respectively connected to the first through hole and the second through hole, the lower part of the gas output unit is provided with a third through hole suitable for connecting to the kiln, the gas outlet end of the lower oxygen supply pipe is connected to the third through hole;

[0017] The oxygen secondary selection device is used to control the oxygen to enter the first upper air supply pipe or the second upper air supply pipe to adjust the flame cross-sectional shape.

[0018] Optionally, the combustion-supporting medium supply unit also includes an oxygen sealing tube and an oxygen center tube, the oxygen sealing tube is installed at one end of the oxygen center tube and is sealedly connected to the fuel supply unit, and the oxygen center gas supply pipe is connected to the mixed gas passage of the gas output unit through the oxygen center tube.

[0019] Optionally, the gas output unit is a refractory brick, and the combustion-supporting medium supply unit is detachably fixed on the refractory brick.

[0020] To achieve the above object, the utility model further provides a burner, comprising the spray gun as described above, wherein the spray gun comprises:

[0021] The fuel supply unit is provided with at least two air intake passages for respectively introducing different fuels;

[0022] a combustion-supporting medium supply unit, connected to the fuel supply unit and provided with a combustion-supporting gas passage for introducing the combustion-supporting gas; and

[0023] A gas output unit is connected to the combustion-supporting medium supply unit, and the gas output unit is provided with a mixed gas passage which is respectively connected to the air intake passage and the combustion-supporting gas passage, and the output end of the mixed gas passage is suitable for extending into the kiln to be used for spraying the mixed gas into the kiln.

[0024] In the technical solution of the utility model, the spray gun includes a fuel supply unit, a combustion medium supply unit and a gas output unit; the fuel supply unit is provided with at least two air inlet passages for respectively introducing different fuels; the combustion medium supply unit is connected to the fuel supply unit and is provided with a combustion gas passage for introducing combustion gas; the gas output unit is connected to the combustion medium supply unit, and the gas output unit is provided with a mixed gas passage respectively connected to the air inlet passage and the combustion gas passage, and the output end of the mixed gas passage is suitable for extending into the kiln to spray the mixed gas into the kiln. It can be understood that when in use, fuels such as natural gas, ammonia and hydrogen can be selectively introduced, two or more fuels can be mixed, and the usage of various fuels can be balanced, which can reduce the usage of natural gas, thereby reducing carbon emissions, and can also reduce the usage of hydrogen, which helps to ensure a better heating effect of the melt. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 This is a schematic structural diagram of an embodiment of a spray gun of the utility model;

[0027] Figure 2 It is a cross-sectional view of the mixing pipe in the first embodiment of the spray gun of the utility model when it is in the first position;

[0028] Figure 3 It is a cross-sectional view of the mixing pipe in the spray gun of the utility model when it is in the second position;

[0029] Figure 4 This is a structural schematic diagram of a fuel supply unit in an embodiment of a spray gun of the utility model;

[0030] Figure 5 This is a structural schematic diagram of a combustion-supporting medium supply unit in an embodiment of a spray gun of the utility model;

[0031] Figure 6 It is a cross-sectional view of a combustion medium supply unit in one embodiment of the spray gun of the utility model;

[0032] Figure 7 This is a schematic diagram of the structure of a gas output unit in one embodiment of the spray gun of the utility model;

[0033] Figure 8 It is a side view of a gas output unit in one embodiment of the spray gun of the utility model;

[0034] Fig. 9 It is a schematic diagram of gas path connection when the oxygen primary selection device in one embodiment of the spray gun of the utility model is in various positions;

[0035] Fig.10 It is a schematic diagram of gas path connection when the oxygen secondary selection device in one embodiment of the spray gun of the utility model is in various positions;

[0036] Fig.11 It is a schematic diagram of the flame cross-sectional shape when the primary oxygen selection device and the secondary oxygen selection device in one embodiment of the spray gun of the utility model are in different combination states.

[0037] Description of Figure Numbers:

[0038] 10. Fuel supply unit; 20. Combustion-supporting medium supply unit; 30. Gas output unit; 10a. Air intake passage; 20a. Combustion-supporting gas passage; 30a. Mixed gas passage; 11. First air intake pipe; 12. Second air intake pipe; 13. Third air intake pipe; 111. First inlet connection structure; 121. Second inlet connection structure; 131. Third inlet connection structure; 14. Gas sealing pipe; 15. Mixing pipe; 21. Oxygen air intake pipe; 22. Oxygen primary selection device; 23. Oxygen upper air supply pipe; 24. Oxygen central air supply pipe; 25. Oxygen lower air supply pipe; 231. First upper air supply pipe; 232. Second upper air supply pipe; 233. Oxygen secondary selection device; 30b. First through hole; 30c. Second through hole; 30d. Third through hole; 26. Oxygen sealing pipe; 27. Oxygen central pipe; 28. Connecting plate; 41. Fastening bolts.

[0039] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] The utility model provides a spray gun which can be applied to a burner, in particular to a burner of a float glass melting furnace, but is not limited here.

[0045] Reference Figures 1 to 3 In one embodiment of the utility model, the spray gun includes a fuel supply unit 10, a combustion-supporting medium supply unit 20 and a gas output unit 30; the fuel supply unit 10 is provided with at least two air inlet passages 10a for respectively introducing different fuels; the combustion-supporting medium supply unit 20 is connected to the fuel supply unit 10 and is provided with at least one combustion-supporting gas passage 20a for introducing combustion-supporting gas; the gas output unit 30 is connected to the combustion-supporting medium supply unit 20, and the gas output unit 30 is provided with a mixed gas passage 30a respectively connected to the air inlet passage 10a and the combustion-supporting gas passage 20a, and the output end of the mixed gas passage 30a is suitable for extending into the kiln to be used for spraying the mixed gas into the kiln.

[0046] In this embodiment, the fuel supply unit 10 may include two, three or more pipelines, and the combustion-supporting medium supply unit 20 may include at least one pipeline, which is not limited here.

[0047] In this embodiment, the gas output unit 30 can be made of a high temperature resistant material, such as a refractory brick, etc., which is not limited here. To facilitate the disassembly and assembly of the spray gun, the combustion medium supply unit 20 can be provided with a connecting plate 28, which can be detachably fixed to the refractory brick by fastening bolts 41 or the like.

[0048] It can be understood that when in use, fuels such as natural gas, ammonia and hydrogen can be selectively introduced to mix two or more fuels. By balancing the usage of various fuels, the usage of fuels with higher carbon content (such as natural gas) can be reduced, thereby reducing carbon emissions. At the same time, the usage of fuels with lower flame radiation formed by combustion (such as hydrogen) can also be reduced, which helps to ensure better heating effect of the melt.

[0049] It should be noted that the burner spray gun provides a fuel supply mode for mixed combustion of two or more gaseous fuels, that is, the spray gun can be fed with two, three or more fuels. Of course, the spray gun can also be fed with only one gaseous fuel, and it is only necessary to block the interface that does not feed the fuel or feed all interfaces with the same fuel. When only one gaseous fuel is fed, the spray gun has the same function as the existing single fuel supply spray gun.

[0050] In order to achieve a diversified fuel supply model to further reduce carbon and other pollutant emissions, refer to Figures 1 to 4 In one embodiment, the fuel supply unit 10 may include a first intake pipe 11, a second intake pipe 12 and a third intake pipe 13. The intake end of the first intake pipe 11 is used to introduce the first fuel, the intake end of the second intake pipe 12 is used to introduce the second fuel, and the intake end of the third intake pipe 13 is used to introduce the third fuel. The outlet ends of the second intake pipe 12 and the third intake pipe 13 are respectively connected to the first intake pipe 11.

[0051] When three gaseous fuels (such as natural gas, ammonia, and hydrogen) are introduced, the use of natural gas can be reduced, thereby achieving the purpose of carbon reduction. At the same time, ammonia is introduced as a fuel, and the excess coefficient of ammonia is controlled (i.e., ammonia is slightly excessive). Excess ammonia can react with nitrogen oxides already generated in the kiln at high temperature to generate nitrogen, which can effectively reduce the generation of nitrogen oxides in the kiln. In other words, the utility model introduces ammonia as a fuel, which can reduce carbon and reduce the emission of nitrogen oxides in the kiln at the same time.

[0052] Main reference Figure 4In this embodiment, the air inlet end of the first air inlet pipe 11 is provided with a first inlet connection structure 111 suitable for externally connecting a first fuel supply device, the air inlet end of the second air inlet pipe 12 is provided with a second inlet connection structure 121 suitable for externally connecting a second fuel supply device, and the air inlet end of the third air inlet pipe 13 is provided with a third inlet connection structure 131 suitable for externally connecting a third fuel supply device. In this way, it is helpful to connect various fuel supply devices and facilitate the introduction of various fuels.

[0053] Furthermore, if Figure 3 and Figure 4 As shown, the fuel supply unit 10 may also include a gas sealing tube 14 and a mixing tube 15. One end of the gas sealing tube 14 is connected to the gas outlet end of the first air inlet pipe 11, and the other end of the gas sealing tube 14 is connected to the mixing tube 15. The mixing tube 15 is inserted into the mixed gas passage 30a through the combustion-supporting gas passage 20a.

[0054] Preferably, refer to Figure 2 and Figure 3 The fuel supply unit 10 and the combustion-supporting medium supply unit 20 can slide relative to each other to change the relative position of the mixing pipe 15 in the mixed gas passage 30a and change the contact position of the fuel and oxygen, thereby adjusting the combustion effect of the burner and further improving the effect of heating the melt.

[0055] In order to achieve a variety of flame cross-section shapes, further meet the heating needs in different scenarios and expand the scope of application, refer to Figure 1 , Figure 5 and Figure 6 In one embodiment, the combustion-supporting medium supply unit 20 may include an oxygen inlet pipe 21, an oxygen primary selection device 22, an oxygen upper air supply pipe 23, an oxygen central air supply pipe 24 and an oxygen lower air supply pipe 25. The air inlet end of the oxygen inlet pipe 21 is used to introduce combustion-supporting gas, and the air outlet end of the oxygen inlet pipe 21 is connected to the oxygen primary selection device 22. The oxygen primary selection device 22 has a first air outlet end, a second air outlet end and a third air outlet end. The first air outlet end of the oxygen primary selection device 22 is connected to the air inlet end of the oxygen central air supply pipe 24, the second air outlet end of the oxygen primary selection device 22 is connected to the air inlet end of the oxygen upper air supply pipe 23, the third air outlet end of the oxygen primary selection device 22 is connected to the air inlet end of the oxygen lower air supply pipe 25, and the air outlet ends of the oxygen upper air supply pipe 23, the oxygen central air supply pipe 24 and the oxygen lower air supply pipe 25 are respectively connected to the gas output unit 30.

[0056] The oxygen primary selection device 22 is used to control the oxygen to enter the oxygen upper gas supply pipe 23 or the oxygen central gas supply pipe 24 or the oxygen lower gas supply pipe 25 to adjust the flame cross-sectional shape.

[0057] In this embodiment, the oxygen primary selection device 22 can adopt a commercially available three-way valve or a manual valve or an electric control valve made based on the principle of a three-way valve, which can allow oxygen to pass through and can allow oxygen to enter the oxygen upper supply pipe 23 or the oxygen central supply pipe 24 or the oxygen lower supply pipe 25 by changing the internal passage.

[0058] like Figure 7 and Figure 8 As shown, in this embodiment, the internal mixed gas passage 30a of the gas output unit 30 may include a central through hole and a central through hole diffuser that are connected in sequence, a first through hole 30b and a second through hole 30c that are respectively connected to the kiln are opened on both sides of the upper part of the gas output unit 30, and a third through hole 30d that is suitable for connecting to the kiln is provided at the lower part of the gas output unit 30. The oxygen central supply pipe 24 enters the kiln through the central through hole and the central through hole diffuser inside the gas output unit 30 to assist in combustion; the oxygen lower supply pipe 25 enters the kiln through the third through hole 30d at the lower part of the gas output unit 30 to assist in combustion.

[0059] Combination Figure 2 , Figure 7 and Figure 8 After the three gas fuels are mixed in the first air inlet pipe 11, they pass through the gas sealing pipe 14 and the mixing pipe 15 in turn, and then enter the central through hole and the central through hole diffusion port inside the gas output unit 30, and are finally transported into the kiln for combustion.

[0060] In this embodiment, the first air inlet pipe 11 and the gas sealing pipe 14, and the gas sealing pipe 14 and the gas mixing pipe 15 can be connected together by welding or other methods.

[0061] Based on the above embodiments, refer to Figure 1 , Figure 5 and Figure 6 The combustion-supporting medium supply unit 20 may also include a first upper air supply pipe 231, a second upper air supply pipe 232 and an oxygen secondary selection device 233. The air outlet end of the upper oxygen air supply pipe 23 is connected to the oxygen secondary selection device 233. The oxygen secondary selection device 233 has a first air outlet end and a second air outlet end. The first air outlet end of the oxygen secondary selection device 233 is connected to the first upper air supply pipe 231, and the second air outlet end of the oxygen secondary selection device 233 is connected to the second upper air supply pipe 232. The air outlet ends of the first upper air supply pipe 231 and the second upper air supply pipe 232 are respectively connected to the first through hole 30b and the second through hole 30c, and the air outlet end of the lower oxygen air supply pipe 25 is connected to the third through hole 30d.

[0062] The oxygen secondary selection device 233 is used to control the oxygen to enter the first upper air supply pipe 231 or the second upper air supply pipe 232 to adjust the flame cross-sectional shape.

[0063] In this embodiment, the oxygen introduced into the oxygen upper gas supply pipe 23 enters the oxygen secondary selection device 233. The oxygen secondary selection device 233 may also be a commercially available three-way valve or a manual valve or an electric control valve made based on the principle of a three-way valve, which allows oxygen to pass through and can change the internal passage to allow oxygen to enter the first upper gas supply pipe 231 or the second upper gas supply pipe 232. The oxygen entering the first upper gas supply pipe 231 enters the kiln through the first through hole 30b of the gas output unit 30 to assist in combustion; the oxygen entering the second upper gas supply pipe 232 enters the kiln through the second through hole 30c of the gas output unit 30 to assist in combustion.

[0064] Reference Figures 9 to 11 The oxygen primary selection device 22 is provided with an upper passage, a middle passage, a lower passage and a selector. Similarly, the oxygen secondary selection device 233 can be provided with a gas supply passage, a left passage, a right passage and a selector. Among them, the selector can selectively deliver oxygen to the target pipeline by switching the state. The oxygen primary selection device 22 and the oxygen secondary selection device 233 can both have 4 states, and various flame cross-section shapes can be formed by selecting these states (for specific flame cross-section shapes, please refer to Fig.11 ) to meet the different requirements of different kilns or different positions of the kiln for the flame cross-sectional shape. Specifically, the four states of the oxygen primary selection device 22 and the oxygen secondary selection device 233 refer to the forms of connection of their respective pipelines. For details, please refer to Fig. 9 and Fig.10 , Fig. 9 The pipeline connection relationship of the oxygen primary selection device 22 in four states is shown in FIG. Fig.10 The diagram shows the pipeline connection relationship of the oxygen secondary selection device 233 under four states.

[0065] Furthermore, in order to facilitate the connection between the fuel supply unit 10 and the combustion medium supply unit 20, and to allow the fuel to flow into the mixed gas passage 30a better to ensure a good combustion effect, the main reference is Figure 6 In this embodiment, the combustion-supporting medium supply unit 20 may also include an oxygen sealing tube 26 and an oxygen center tube 27. The oxygen sealing tube 26 is installed at one end of the oxygen center tube 27 and is sealed and connected to the fuel supply unit 10. The oxygen center gas supply pipe 24 is connected to the mixed gas passage 30a of the gas output unit 30 through the oxygen center tube 27.

[0066] Specifically, combined Figure 2 , Figure 3 , Figure 4 and Figure 6The mixing pipe 15 of the fuel supply unit 10 is inserted into the oxygen center pipe 27 inserted into the combustion medium supply unit 20. The contact parts are the gas sealing pipe 14 and the oxygen sealing pipe 26. The two sealing pipes can be sealed with two layers of standard O-rings to ensure that oxygen does not leak. The fuel supply unit 10 can slide back and forth in the combustion medium supply unit 20, thereby changing the relative position of the mixing pipe 15 in the center through hole of the gas output unit 30, thereby changing the contact position between the gas and oxygen.

[0067] It is worth mentioning that in the conventional all-oxygen spray gun, oxygen is only introduced through the central hole of the refractory bricks and burns with the fuel in the refractory bricks. Since the temperature of the all-oxygen flame is relatively high, the refractory bricks are easily burned. However, in the present invention, in addition to the oxygen being introduced through the central hole, part of the oxygen is also introduced through the first through hole 30b, the second through hole 30c and the third through hole 30d (e.g. Figure 8 As shown in the figure, this part of oxygen does not burn before entering the kiln, and its temperature is much lower than the temperature inside the kiln. It can effectively cool the refractory bricks and protect them from being burned, which is beneficial to extend the service life of the spray gun.

[0068] The utility model also proposes a burner, which includes a spray gun. The specific structure of the spray gun refers to the above embodiment. Since the burner proposed by the utility model includes all schemes of all embodiments of the above spray gun, it has at least the same technical effects as the above spray gun, which will not be elaborated here one by one.

[0069] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A spray gun, characterized in that: include: The fuel supply unit is provided with at least two air intake passages for respectively introducing different fuels; a combustion-supporting medium supply unit, connected to the fuel supply unit and provided with a combustion-supporting gas passage for introducing the combustion-supporting gas; and A gas output unit is connected to the combustion-supporting medium supply unit, and the gas output unit is provided with a mixed gas passage which is respectively connected to the air intake passage and the combustion-supporting gas passage, and the output end of the mixed gas passage is suitable for extending into the kiln to be used for spraying the mixed gas into the kiln.

2. The spray gun according to claim 1, characterized in that The fuel supply unit includes a first intake pipe, a second intake pipe and a third intake pipe. The intake end of the first intake pipe is used to introduce a first fuel, the intake end of the second intake pipe is used to introduce a second fuel, and the intake end of the third intake pipe is used to introduce a third fuel. The outlet ends of the second intake pipe and the third intake pipe are respectively connected to the first intake pipe.

3. The spray gun according to claim 2, characterized in that The air inlet end of the first air inlet pipe is provided with a first inlet connection structure suitable for externally connecting to a first fuel supply device, the air inlet end of the second air inlet pipe is provided with a second inlet connection structure suitable for externally connecting to a second fuel supply device, and the air inlet end of the third air inlet pipe is provided with a third inlet connection structure suitable for externally connecting to a third fuel supply device.

4. The spray gun according to claim 2, characterized in that The fuel supply unit also includes a gas sealing tube and a gas mixing tube, one end of the gas sealing tube is connected to the gas outlet end of the first air inlet pipe, and the other end of the gas sealing tube is connected to the gas mixing tube, and the gas mixing tube is inserted into the mixed gas passage through the combustion-supporting gas passage.

5. The spray gun according to claim 4, characterized in that The fuel supply unit and the combustion-supporting medium supply unit can slide relative to each other to change the relative position of the gas mixing pipe in the mixed gas passage and thus change the contact position of the fuel and oxygen.

6. The spray gun according to claim 1, characterized in that The combustion-supporting medium supply unit comprises an oxygen inlet pipe, an oxygen primary selection device, an upper oxygen supply pipe, an oxygen central supply pipe and an oxygen lower supply pipe, the inlet end of the oxygen inlet pipe is used to introduce combustion-supporting gas, the outlet end of the oxygen inlet pipe is connected with the oxygen primary selection device, the oxygen primary selection device has a first outlet end, a second outlet end and a third outlet end, the first outlet end of the oxygen primary selection device is connected with the inlet end of the oxygen central supply pipe, the second outlet end of the oxygen primary selection device is connected with the inlet end of the upper oxygen supply pipe, the third outlet end of the oxygen primary selection device is connected with the inlet end of the lower oxygen supply pipe, the outlet ends of the upper oxygen supply pipe, the oxygen central supply pipe and the lower oxygen supply pipe are respectively connected with the gas output unit; The oxygen primary selection device is used to control the oxygen to enter the oxygen upper gas supply pipe, the oxygen central gas supply pipe or the oxygen lower gas supply pipe to adjust the flame cross-sectional shape.

7. The spray gun according to claim 6, characterized in that The combustion-supporting medium supply unit also includes a first upper air supply pipe, a second upper air supply pipe and an oxygen secondary selection device, the gas outlet end of the oxygen upper air supply pipe is connected to the oxygen secondary selection device, the oxygen secondary selection device has a first gas outlet end and a second gas outlet end, the first gas outlet end of the oxygen secondary selection device is connected to the first upper air supply pipe, the second gas outlet end of the oxygen secondary selection device is connected to the second upper air supply pipe, the upper two sides of the gas output unit are provided with a first through hole and a second through hole respectively connected to the kiln, the gas outlet ends of the first upper air supply pipe and the second upper air supply pipe are respectively connected to the first through hole and the second through hole, the lower part of the gas output unit is provided with a third through hole suitable for connecting to the kiln, the gas outlet end of the oxygen lower air supply pipe is connected to the third through hole; The oxygen secondary selection device is used to control the oxygen to enter the first upper air supply pipe or the second upper air supply pipe to adjust the flame cross-sectional shape.

8. The spray gun according to claim 6, characterized in that The combustion-supporting medium supply unit also includes an oxygen sealing tube and an oxygen center tube. The oxygen sealing tube is installed at one end of the oxygen center tube and is sealed and connected to the fuel supply unit. The oxygen center gas supply pipe is connected to the mixed gas passage of the gas output unit through the oxygen center tube.

9. The spray gun according to claim 1, characterized in that The gas output unit is a refractory brick, and the combustion-supporting medium supply unit is detachably fixed on the refractory brick.

10. A burner, characterized in that: Comprising the spray gun as described in any one of claims 1 to 9.

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