Immersed burner with multiple nozzles and kiln

Abstract

The utility model discloses a submerged burner with multiple nozzles, which comprises a burner body and at least one nozzle, at least one first passage and at least one second passage are formed in the nozzle, the at least one first passage is derived from a common first fluid passage, and / or the at least one second passage is derived from a common second fluid passage, wherein at least one valve is provided upstream of the at least one first passage and / or the at least one second passage, the valve providing selective communication of the first fluid and / or the second fluid to the outlet of the first passage and / or the outlet of the second passage. The reasonable design of the public fuel channel and the public oxidant channel saves space and reduces cost. The design of the one-way valve has the effect of preventing backfire from burning to an adjacent burner, and the nozzle cannot be blocked.

Description

Technical Field

[0001] This application belongs to the field of combustion and relates to an immersion burner for melting materials by mixing an oxidizer and a fuel. In particular, it relates to an immersion burner with multiple nozzles. Background Art

[0002] The immersion combustion technology is widely used in industries such as glass, mineral, and metal manufacturing. The immersion burner is located below the surface of the molten material. The immersion burner is installed on the side wall and / or bottom wall of the kiln, and its nozzles are immersed in the melt. For the immersion burner, the flame and combustion products after the combustion of the fuel and the oxidizer pass through and directly contact the melt. Therefore, the heat transfer effect is much more effective than the heat transfer by flame radiation above the melt surface, thereby reducing the heat transfer to the refractory material in the kiln and the heat loss in the flue gas. This can reduce fuel consumption and thus reduce carbon dioxide emissions. Moreover, since the temperature of the combustion chamber above the melt is relatively low, the emission of NOx during the combustion process is also reduced.

[0003] The typical structure of the immersion burner is disclosed in Publication No. US2016060154A1. The flame of the immersion burner travels vertically through the glass melt, entraining a large amount of glass melt and spraying the glass melt to the side. The immersion burner includes a hollow tube, a first gas supply pipeline, and a second gas supply pipeline. Among them, the first gas supply pipeline delivers the first gas through the tube and exits from the top end of the tube; the second gas supply pipeline delivers the second gas through the tube and exits from the top end of the tube. The first gas and the second gas are mixed, and the mixed gas is emitted from the top end of the tube.

[0004] Since the immersion burner is immersed in the melt, once a combustion failure occurs, the melt flows back into the immersion burner and solidifies, and the immersion burner cannot be used continuously. When the impulsive force of the nozzles of the immersion burner is insufficient, the flame is prone to flashback or spray out from the adjacent refractory material. The nozzles or the immersion burner are extremely prone to wear and have a short service life. In the prior art, there is a lack of a cut-off and adjustment control device between the fuel or oxidizer pipeline and the burner nozzles of the immersion burner, and the combustion cannot be cut off in time when flashback occurs. The nozzles and the burner body are often integrated, and the individual nozzles cannot be replaced.

[0005] In addition, when the size of the kiln increases, multiple groups or multiple rows / columns of immersion burners need to be arranged. If each group of immersion burners is respectively arranged with fuel or oxidizer pipelines, the size of the entire burner module will be very large, which brings difficulties to the maintenance of the kiln. Summary of the Utility Model

[0006] When abnormal combustion such as flashback occurs, there is a possibility that the flame adheres to the nozzle and causes thermal damage. Therefore, it is desired to suppress the occurrence of such a situation.

[0007] To solve the above technical problems, a first aspect of the present application provides an immersion burner with multiple nozzles, including a burner body and at least one nozzle. At least one first passage and at least one second passage are formed in the nozzle, and the at least one first passage and the at least one second passage are arranged such that a first fluid from an outlet of the at least one first passage and a second fluid from an outlet of the at least one second passage are mixed with each other;

[0008] The at least one first passage is derived from a common first fluid channel, and / or the at least one second passage is derived from a common second fluid channel.

[0009] Wherein, at least one valve is arranged upstream of the at least one first passage and / or the at least one second passage, and the valve provides selective communication of the first fluid and / or the second fluid to the outlet of the first passage and / or the outlet of the second passage.

[0010] Further, the valve is a check valve.

[0011] Further, a mixing channel is formed at the end of a nozzle, and the outlet of each first passage and the outlet of each second passage are in fluid communication with the mixing channel, so that the first fluid and the second fluid are mixed in the mixing channel and flow out through the outlet of the mixing channel.

[0012] Further, a protective member is arranged at the end of the nozzle, and the protective member is sealingly connected to the burner body.

[0013] Further, the protective member includes a partial cylindrical section and a partial conical section.

[0014] Further, a cooling medium channel is integrated in the immersion burner.

[0015] Further, the cooling medium channel extends to the mixing channel.

[0016] Further, the cooling medium channel is derived from a common cooling channel.

[0017] Further, each first passage includes a first flow regulating device.

[0018] Further, each second passage includes a second flow regulating device.

[0019] Further, one of the first fluid and the second fluid is an oxidant, and the other is a fuel.

[0020] The second aspect of the present application provides a kiln furnace, which is configured with an inlet for molten material, a melt outlet, and a melting chamber for melting the molten material. The kiln furnace includes at least one submerged burner installed at the bottom of the kiln furnace according to any one of the foregoing in the melting chamber.

[0021] Compared with the prior art, the technical solution provided by the present application has the following advantages:

[0022] 1. The reasonable design of the common fuel channel and the common oxidant channel can achieve the purpose of saving space and reducing costs.

[0023] 2. The design of the one-way valve has the effect of preventing backfire from burning to adjacent burners, and nozzle blockage will not occur.

[0024] 3. The end of the burner nozzle can be replaced separately, which greatly saves the cost of replacing wear-prone parts and there is no need to replace the entire nozzle.

[0025] 4. The size, shape, and number of the mixing channels at the burner nozzle can be replaced as needed to achieve different premixing effects and adjust the position of the high-temperature point of the flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The advantages and spirit of the present application can be further understood through the following detailed description and drawings.

[0027] Figure 1 is a schematic diagram of the overall structure of the burner provided by the present application;

[0028] Figure 2 is a top view of a multi-nozzle burner provided by the present application;

[0029] Figure 3 is along Figure 2 the sectional view of the multi-nozzle burner along the O-O tangent line in;

[0030] Figure 4 is a top view of another multi-nozzle burner provided by the present application;

[0031] Figure 5 is a schematic diagram of the protective part and the nozzle outlet of another multi-nozzle burner provided by the present application;

[0032] Figure 6 is Figure 2 a schematic diagram of a multi-nozzle burner in which a common oxidant channel and a common fuel channel are configured;

[0033] Figure 7 is along Figure 6 the sectional view of the burner along the B-B tangent line in;

[0034] Figure 8 is alongFigure 6 Cross-sectional view of the burner along the C-C tangent line.

[0035] In the figure: 1 represents the burner body, 2 represents the protective part, 2-1 represents the nozzle outlet of the burner, 3 represents the fuel-oxidizer delivery assembly, 3-1 represents the oxidizer passage, 3-2 represents the fuel passage, 3-3 represents the outlet of the fuel passage, 3-4 represents the check valve, 4 represents the cooling water assembly, 4-1 represents the inlet pipe of the cooling water, 4-2 represents the return pipe of the cooling water, 5 represents the temperature sensor. 6 represents the common oxidizer passage, 7 represents the common fuel passage, and 8 represents the mixing passage. Specific embodiments

[0036] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it should be understood that the present application is not limited to the embodiments described below, and the technical concept of the present application can be implemented in combination with other known technologies or other technologies with the same functions as those known technologies.

[0037] In the description of the following specific embodiments, in order to clearly show the structure and working mode of the present application, many directional terms will be used for description. However, terms such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "axial", "radial", etc. should be understood as convenient terms and should not be understood as limiting terms.

[0038] In the description of the following specific embodiments, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 to the present application.

[0039] The terms "upward", "downward", "above" and "below" are made with reference to the central transverse axis of the submerged burner. Therefore, the terms "upward" and "downward" should be understood to refer to directions away from and towards the transverse axis. In addition, when the first structure is described as being located "above" or "below" the second structure, this should be understood to mean that the first structure is located farther or closer to the transverse axis.

[0040] In addition, the terms "first" and "second" are used only for descriptive purposes and do not limit the chronological order, quantity, or importance. They should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Instead, they are merely used to distinguish one technical feature in this technical solution from another. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined. Similarly, the qualifier similar to "a" that appears in this text does not limit the quantity but describes a technical feature that has not appeared previously. Similarly, unless a noun is modified by a specific quantifier, it should be regarded as including both the singular and plural forms in this text. In this technical solution, it may include a single or a plural number of such technical features. Similarly, the modifiers similar to "about" or "approximately" that appear before a numeral usually include the present number, and their specific meanings should be understood in the context of the context.

[0041] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality of" means two or more. "And / or" is used to describe the association relationship of associated objects and indicates that three relationships may exist. For example, "A and / or B" may represent: only A exists, only B exists, and both A and B exist simultaneously. Here, A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (one)" or its similar expression means any combination of these items, including any combination of a single item (one) or plural items (ones). For example, at least one (one) of a, b, or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c may be single or plural.

[0042] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. "Fixedly connected" or "fixed connection" or "non - movably connected" is understood to mean that the connection between two or more structural members is not configured to provide relative movement. An example of a fixed connection is a welded joint or a bolt connection, and in some cases, a weld seam and a bolt connection. "Movably connected" or "movable" or "movable connection" is understood to mean a connection between two or more structural members that allows horizontal and / or vertical relative movement between the members under extreme dynamic loads. Such a connection generally does not allow movement under static loads or general dynamic loads (such as those imposed by mild / moderate wind forces).

[0043] The terms "unit", "piece", "object", and "module" described in this specification represent units for handling at least one function and operation, and can be implemented by hardware components or software components and their combinations.

[0044] The term "sealed connection" or "sealable connection" represents the following characteristics: two components are connected or can be connected by welding, bonding, threading, or other means, such that no contents will leak from a specific chamber through this sealed connection.

[0045] "Upstream" and "downstream" described in this specification are defined relative to the expected flow of a fluid (e.g., fuel or oxidant). The upstream end corresponds to the end closest to the inlet where the fluid is introduced into the device, and the downstream end corresponds to the outlet or nozzle end where the fluid exits the device.

[0046] Unless clearly indicated to the contrary, each aspect or embodiment defined herein can be combined with any other one or more aspects or one or more embodiments. In particular, any feature indicated as preferred or advantageous can be combined with any other feature indicated as preferred or advantageous.

[0047] Term Explanation

[0048] As used herein, the term "fuel" refers to gaseous fuel, liquid fuel, or solid fuel that can be used interchangeably or in combination. If it is at least partially in gaseous form, it can be introduced directly into the burner. If in liquid or solid form, it is introduced near the burner. Gaseous fuels can be natural gas (primarily methane), propane, hydrogen, syngas, biogas, or any other hydrocarbon compound and / or sulfur-containing compound and / or nitrogen-containing compound. Solid or liquid fuels can be any compound primarily in carbon- and / or hydrocarbon- and / or sulfur-containing forms. Those skilled in the art can determine the introduction method of gaseous fuel, liquid fuel, or solid fuel as needed, and this application does not intend to make any restrictions.

[0049] As used herein, "oxidizer" can consist of an oxidizer such as air or oxygen-enriched air. The oxidizer stream preferably consists of an oxidizer with an oxygen molar concentration of at least 50%, preferably at least 80%, more preferably at least 90%, and most preferably at least 95%. These oxidizers include oxygen-enriched air containing at least 50% by volume of oxygen, 99.5% pure oxygen produced by a cryogenic air separation unit, or non-pure oxygen (88% by volume or more) produced by a vacuum pressure swing adsorption process, or oxygen produced from any other source.

[0050] As used herein, the term "nozzle" refers to a component located at the end of the burner that sprays fuel and oxidizer to cause combustion, which can be a separate component or integrated with other components.

[0051] As used herein, the terms "molten", "melted", "melting operation", "melting process" include the operation of heating a medium to be heated from a substantially solid state to a substantially liquid state.

[0052] As used herein, the term "melt" refers to a substance obtained after melting that can contain inorganic compositions, metals, organic compositions, etc., which can be molten glass, molten metal, molten resin, molten waste, etc.

[0053] As used herein, the term "axial" refers to the direction of a rotational axis, symmetry axis, or approximate centerline that is generally parallel to the central axis direction of the burner body. The term "radial" can refer to the direction or relationship with respect to a line extending perpendicularly outward from a shared centerline, axis, or similar reference.

[0054] As used herein, "flow rate" refers to the volume of the "first fluid", "second fluid", "mixed fluid" or "premixed gas" involved herein flowing through a unit cross-sectional area in the passage / channel where it is located or at the outlet per unit time, and can be expressed as flow rate v = V / (T*S), where V represents the volume of the fluid, T represents time, and S represents the cross-sectional area in the passage / channel where it is located or at the outlet, and its unit is, for example, m / s.

[0055] As used herein, "surrounding" or "encircling" basically refers to a shape forming a ring, and generally means that the inner circle is surrounded within the outer circle, so that there is a certain gap between the inner layer and the outer layer. The gap here can be an annular gap or a non-annular gap.

[0056] As used herein, a check valve can be referred to as a non-return valve or a reflux valve.

[0057] The content disclosed in the Chinese invention patent with the application number CN202111680255.3 is incorporated herein by reference in its entirety.

[0058] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0059] Embodiment 1

[0060] According to an exemplary embodiment of the present application, an immersion burner is provided. Although the overall structure of the burner is not shown in the drawings for simplicity, those skilled in the art can understand the complete main body of the immersion burner.

[0061] In a kiln equipped with such a burner in the embodiment, those skilled in the art can determine the appropriate number of immersion burners in each kiln, for example, including the number of immersion burners between 10 and 100, preferably between 20 and 80. These immersion burners can be arranged in several rows or columns parallel to each other. Each burner includes at least one individual nozzle. Each nozzle preferably has substantially the same diameter. For example, multiple nozzles can be configured Figure 2 radially with a common center as shown, and are formed on the same burner. For example, multiple nozzles can also be configured in an array of multiple rows or columns and are formed on the same burner.

[0062] In each nozzle of the burner body, at least one first passage and at least one second passage are formed, and at least one first passage and at least one second passage are arranged such that a first fluid from an outlet of at least one first passage and a second fluid from an outlet of at least one second passage are mixed with each other. In the above example, one of the first fluid and the second fluid is an oxidant and the other is a fuel. Hereinafter, an example in which the first fluid is an oxidant and the second fluid is a fuel will be described. However, those skilled in the art can also understand that the first fluid can also be a fuel and the second fluid can be an oxidant.

[0063] As Figure 1 and Figure 3 shown, a fuel-oxidant delivery assembly 3 is configured with:

[0064] At least one fuel passage 3-2 for fuel to flow through, and an outlet 3-3 of the fuel passage is provided at one end thereof; and

[0065] At least one oxidant passage 3-1 for oxidant to flow through, and the oxidant passage 3-1 is configured to surround the outer wall of the fuel passage 3-2.

[0066] To optimize the occupied space of the submerged burner and the arrangement of the supply ports of the first fluid and the second fluid, a design of a common first fluid channel and a common second fluid channel can be adopted. All the first passages are derived from the common first fluid channel. Similarly, all the second passages are derived from the common second fluid channel. Wherein the inlet of the common first fluid channel is in fluid communication with the supply port of the first fluid; and the inlet of the common second fluid channel is in fluid communication with the supply port of the second fluid. For example, as Figure 6 shown, a common fuel channel 7 and a common oxidant channel 6, Figure 7 and Figure 8 respectively show cross-sectional views along Figure 6 the B-B tangent and the C-C tangent in

[0067] In some embodiments, flow regulating devices, such as distribution valves, can be provided in each first passage and each second passage to distribute the first fluid among multiple first passages or to distribute the second fluid among multiple second passages.

[0068] The end of the nozzle forms a mixing channel 8. The outlet of each fuel passage 3-2 and the outlet of each oxidant passage 3-1 are both in fluid communication with the mixing channel 8, such that the fuel and the oxidant are premixed in the mixing channel 8 and flow out through the outlet of the mixing channel 8 for ejection. The degree of mixing of the fuel and the oxidant plays a crucial role in the combustion speed and the flame stability. In this application, by forming the mixing channel 8 inside the burner, the fuel and the oxidant are premixed in the mixing channel before being ejected from the burner. The pre-mixing of the fuel and the oxidant makes the combustion flame more stable and enables the combustion to proceed faster. As Figure 3 shown, exemplarily, one mixing channel 8 is provided in the nozzle, and the flow rate of the fluid mixture in the mixing channel can be greater than the flow rate of the fluid mixture at the outlet. As Figure 4 and Figure 5 shown, exemplarily, the mixing channel 8 can be divided into a plurality of branches in a trumpet shape near the nozzle outlet 2-1, thereby affecting the angle and shape of the ejected flame.

[0069] The front end of the nozzle (i.e., at least part of the mixing channel) is configured with a protective member 2 having a conical, cylindrical or annular outer periphery. The protective member 2 can include a partial cylindrical section and a partial conical section. The protective member 2 is hermetically connected to the burner body 1 and has an internal space. The protective member is formed of metal. As the material for forming the protective member, it is not limited thereto. The protective member can be made of materials such as titanium, ceramics or high-temperature-resistant metals containing nickel and chromium that are more heat-resistant than the nozzle. The thickness of the protective member can be adjusted according to the usage conditions. The design of the protective member makes it easy to replace and simple to install. When exposed to a flame such as flashback, the protective member may melt and be damaged, thereby protecting the burner or the main body part of the nozzle from being burned. The method for replacing the protective member at this time includes: separating the protective member from the nozzle, installing the cylindrical section of the housing of the replacement protective member onto the burner body through a sliding fit (such as a threaded connection), and the rear conical section extending outward. It is known to those skilled in the art that the shape, quantity and angle of partial sections of the mixing channel surrounded by the protective member can all be adjusted to change the shape of the combustion flame.

[0070] In some cases, flashback (reverse combustion) may occur in the mixing channel 8, for example, the flame returns along the mixing channel 8 to the fuel passage 3-2 and the oxidant passage 3-1. For example, the flame moves into the mixing channel 8, the flow rate and pressure of the oxidant passage 3-1 increase, the oxidant will flow into the fuel passage 3-2, and then flow back reversely through the common fuel channel 7 into the adjacent nozzle / burner, causing damage to the burner. To solve the above problems, as Figure 6As shown, a check valve 3-4 can be provided in the upstream fuel passage 3-2. This check valve 3-4 can allow fuel to flow into the mixing passage 8 through operation, while preventing the oxidant from flowing back into the fuel passage 3-2. That is to say, if the pressure in the fuel passage 3-2 drops below a predetermined level, the fuel check valve closes to isolate the connection between the oxidant passage and the fuel passage. At the same time, the fuel fluid pressure in the fuel passage can be adjusted and increased to further prevent the oxidant from flowing back into the fuel passage.

[0071] Similarly, an oxidant check valve (not shown in the figure) can be provided in the oxidant passage 3-1. At this time, if the pressure in the oxidant passage drops below a predetermined level, the oxidant check valve closes to isolate the connection between the oxidant passage and the fuel passage.

[0072] Exemplarily, each nozzle is provided with an independent oxidant and / or fuel check valve.

[0073] During flashback (reverse combustion), the fuel and / or oxidant check valve interrupts the fuel to the fuel passage 3-2 or the oxidant to the oxidant passage 3-1, reducing or even stopping the flowing fuel or oxidant. This operation can cause partial or complete flameout, thereby weakening or eliminating the reverse combustion condition.

[0074] As Figure 3 shown, a temperature sensor (such as a thermocouple) 5 or a pressure sensor extends into the burner body to indicate whether the mixing passage is blocked. If flashback occurs, the temperature of the mixing passage 8 and even the fuel passage 3-2 will rise to a set value. Or, if the mixing passage 8 is blocked, the pressure of the fuel / oxidant will increase.

[0075] Furthermore, since cooling is very important for the burner, especially for the submerged burner, to prevent ablation and damage to the burner. The burners in the above examples of this application can be configured with a cooling medium passage located outside the burner body. The cooling medium circulates in this cooling medium passage to cool down the burner and prevent the temperature of the burner from exceeding the maximum temperature it can withstand. Taking the circulation of cooling water in the cooling medium passage as an example, as Figure 3 shown, the cooling water assembly 4 includes a water inlet pipe 4-1 for cooling water and a water return pipe 4-2 for cooling water. Exemplarily, each burner can be inserted into a cooling sleeve to form a burner assembly as a whole. The scale of the burner assembly can be set according to the heating position and heating power requirements.

[0076] In order to save costs and simplify the installation process, the present application also provides a burner module, which includes the burner assemblies in the above examples and a common cooling channel. A plurality of installation spaces are defined in a common cooling block formed by the common cooling channel, and each of the burners is installed in each of the installation spaces and cooled. In this way, there is no need to install a separate cooling jacket for each burner, so the cost can be reduced and the installation process can be simplified. Those skilled in the art can understand that in order to achieve a better cooling effect, the burner assembly including the cooling jacket can also be arranged in the installation space to achieve a double cooling effect on the burner. In order to achieve the purpose of saving space and cost and achieving a better cooling effect, the burner can also be integrated with the common cooling block to form an integral part, for example, the outer surface of the burner and the common cooling block together define a cooling channel for the cooling medium.

[0077] The present application also provides a heating device, which is, for example, a kiln furnace that accommodates a molten substance, and the above-mentioned submerged burner can be arranged in the heating device. The submerged burner can be arranged at the bottom or side wall or top wall of the kiln furnace. For the submerged burner, its nozzle is submerged in the molten substance. The heating device can achieve various required power ranges by flexibly combining the burners. Taking an example that a submerged burner includes 4 independent nozzles. A circular protective member 2 is arranged around the outlets of the independent nozzles. The power range of each burner is 50KW to 300KW. The outlet diameter range of each independent nozzle is between 1 and 10mm, preferably 4 to 7mm. The pre-mixed gas flow velocity range of each nozzle is between 30 and 320 m / s.

[0078] What is described in this specification is only the preferred specific embodiments of the present application. The above embodiments are only used to illustrate the technical solutions of the present application rather than to limit the present application. Any technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments according to the concept of the present application should be within the scope of the present application.

Claims

1. An immersion burner with multiple nozzles, comprising a burner body and at least one nozzle, characterized in that: At least one first passage and at least one second passage are formed in the nozzle, and the at least one first passage and the at least one second passage are arranged so that a first fluid from an outlet of the at least one first passage and a second fluid from an outlet of the at least one second passage are mixed with each other; at least one first passage is derived from a common first fluid channel, and / or at least one second passage is derived from a common second fluid channel, At least one valve is disposed upstream of at least one first passage and / or at least one second passage, and the valve provides selective communication of the first fluid and / or the second fluid to the outlet of the first passage and / or the outlet of the second passage.

2. The submerged burner according to claim 1, characterized in that The valve is a one-way valve.

3. The submerged burner according to claim 1 or 2, characterized in that: A mixing channel is formed at the end of a nozzle, and the outlet of each first passage and the outlet of each second passage are fluidly connected to the mixing channel, so that the first fluid and the second fluid are mixed in the mixing channel and flow out through the outlet of the mixing channel.

4. The submerged burner according to claim 1 or 2, characterized in that: A protective member is arranged at the end of the nozzle, and the protective member is sealed and connected to the burner body.

5. The submerged burner according to claim 4, characterized in that The guard includes a partial cylindrical section and a partial conical section.

6. The submerged burner according to claim 1, characterized in that A cooling medium channel is integrated into the submerged burner.

7. The submerged burner according to claim 1, characterized in that Each first passage includes a first flow regulating device.

8. The submerged burner according to claim 1, characterized in that Each second passage includes a second flow regulating device.

9. The submerged burner according to claim 1, characterized in that One of the first fluid and the second fluid is an oxidant, and the other is a fuel.

10. A kiln, characterized in that: The kiln is provided with an inlet for molten material, a melt outlet and a melting chamber for melting the molten material, and the kiln comprises in the melting chamber at least one submerged burner installed at the bottom of the kiln according to any one of claims 1 to 9.

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