Hydrogen combustion device

Abstract

This hydrogen combustion device is provided with: a hydrogen burner having a burner throat that has an air flow path through which combustion air flows, and a fuel nozzle that ejects hydrogen fuel into the air flow path or into the flow of combustion air blown out from the burner throat, and that burns the hydrogen fuel and emits a hydrogen flame; and a developer adding device that adds a powdered developer comprising a metal or a metal salt that reacts with the hydrogen flame to the combustion air.

Description

Technical Field

[0001] The present disclosure relates to a technique for visualizing a hydrogen flame in a hydrogen combustion device. Background Art

[0002] In recent years, hydrogen has become a fuel that does not emit CO even when burned. 2 It has attracted attention as a low environmental load and clean fuel. On the other hand, compared with other gas fuels such as LNG, hydrogen fuel has extremely weak luminous intensity in the visible wavelength range and does not generate light flames, so it is difficult to visually confirm the hydrogen flame. The operator of the combustion furnace sometimes determines whether there are abnormalities in the burner, fuel supply system, and air supply system based on the state of the flame visually observed. Therefore, a technology for visualizing the hydrogen flame has been proposed in the past.

[0003] The hydrogen combustion device disclosed in Patent Document 1 includes: a burner that burns hydrogen to emit a hydrogen flame; and a spray nozzle that is disposed adjacent to the burner and sprays a coloring liquid that exhibits a flame color reaction. The coloring liquid sprayed from the spray nozzle contacts the hydrogen flame emitted from the burner to exhibit a flame color reaction, thereby coloring the hydrogen flame.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-8244 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the hydrogen combustion device of Patent Document 1, since the spray nozzle of the coloring liquid is arranged adjacent to the fuel outlet of the burner, the spray nozzle exposed to the high-temperature hydrogen flame may burn out. In addition, in order to arrange the spray nozzle adjacent to the fuel outlet of the burner, it is necessary to make a significant design change from the existing burner. In addition, in order to make the spray range of the coloring liquid from the spray nozzle wider, it is necessary to suppress the surrounding air from being drawn into the surroundings of the sprayed coloring liquid.

[0009] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a technology for realizing visualization of a hydrogen flame with a simple structure in a hydrogen combustion device.

[0010] Means for solving problems

[0011] In order to solve the above-mentioned problems, a hydrogen combustion device in one embodiment of the present invention comprises: a hydrogen burner, which has a burner throat and a fuel nozzle, the burner throat has an air flow path for combustion air to flow, the fuel nozzle sprays hydrogen fuel into the air flow path or into the flow of the combustion air blown out from the burner throat, and the hydrogen burner burns the hydrogen fuel to emit a hydrogen flame; and a color developer adding device, which adds a powdered color developer composed of a metal or a metal salt that reacts with the hydrogen flame to produce a flame color to the combustion air.

[0012] Effects of the Invention

[0013] According to the present disclosure, it is possible to provide a technology for realizing visualization of a hydrogen flame with a simple structure in a hydrogen combustion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing the overall structure of a hydrogen combustion device according to an embodiment of the present disclosure.

[0015] Figure 2 It is a diagram showing the overall structure of a hydrogen combustion device according to Modification 1.

[0016] Figure 3 This is a diagram showing a schematic structure of a hydrogen combustion device according to Modification 2. DETAILED DESCRIPTION

[0017] Next, embodiments of the present disclosure will be described with reference to the drawings. Figure 1 This is a diagram showing a schematic configuration of a hydrogen combustion device 1 according to one embodiment of the present disclosure. Figure 1 The hydrogen combustion device 1 shown is a device for burning hydrogen fuel, and for example, a furnace or a combustion furnace of a boiler is provided as a combustion device. The hydrogen combustion device 1 of this embodiment comprises a hydrogen burner 2 and a developer adding device 4 for supplying a developer to the combustion air of the hydrogen burner 2. The hydrogen burner 2 may be a hydrogen-only burner or a hydrogen-mixed burner.

[0018] 〈Hydrogen Burner 2〉

[0019] The hydrogen burner 2 of this embodiment is a general multi-tube type burner. However, the form of the hydrogen burner 2 included in the hydrogen combustion device 1 of the present disclosure is not particularly limited, and for example, it may be a core sintering type burner.

[0020] The hydrogen burner 2 has a cylindrical burner throat 21, a plurality of fuel nozzles 22 arranged inside the burner throat 21, and a wind box 23 connected to the burner throat 21. The wind box 23 is connected to an air supply pipe 25, and combustion air is supplied to the wind box 23 through the air supply pipe 25. An air register 24 is interposed between the wind box 23 and the burner throat 21, and the combustion air in the wind box 23 is adjusted to a suitable amount for combustion by the air register 24 and is sent into the burner throat 21.

[0021] The inner cylinder is concentrically arranged in the burner throat 21, so that a primary air flow path 31 on the inner circumference side of the inner cylinder and a secondary air flow path 32 on the outer circumference side of the inner cylinder are formed in the burner throat 21. The front end of the burner throat 21 serves as an air outlet 30 for the combustion air flowing in the primary air flow path 31 and the secondary air flow path 32 to be blown out.

[0022] The plurality of fuel nozzles 22 include a central nozzle disposed at the axis of the burner throat 21 and a plurality of peripheral nozzles disposed in a ring shape with the central nozzle as the center. A flame stabilizer 29 is provided around the front end of the central nozzle. The central nozzle may also be an oil nozzle for spraying oil fuel. The plurality of peripheral nozzles are disposed between the primary air flow path 31 and the secondary air flow path 32.

[0023] In the hydrogen burner 2, the combustion air that is pressure-sent from the wind box 23 to the burner throat 21 is blown out from the air outlet 30 through the air flow paths 31 and 32. In the flow of the combustion air blown out from the air outlet 30, the fuel gas is ejected from the nozzles at the front ends of the plurality of fuel nozzles 22. The fuel gas is a gas containing hydrogen or hydrogen. The hydrogen ejected from the fuel nozzle 22 is mixed with the combustion air and burns to generate a hydrogen flame.

[0024] <Developer adding device 4>

[0025] The developer adding device 4 adds a developer to the combustion air before mixing with the hydrogen fuel. The developer adding device 4 of this embodiment is configured to supply the developer to the flow path of the combustion air in the burner throat 21 of the hydrogen burner 2.

[0026] The color developer is a powdered (or granular) metal or metal salt that uses flame color reaction to visualize the hydrogen flame. As such a color developer, metals such as alkali metals, alkaline earth metals, copper, or their metal salts are used. Sodium chloride (NaCl), sodium bicarbonate (NaHCO 3 ) and sodium carbonate (Na 2 CO 3 ) or other alkali metal salts as color developers.

[0027] The developer adding device 4 has a supply pipe 41, a feeder 42, and an operating member 43. The supply port 411 provided in the supply pipe 41 is arranged in the air flow path 31, 32 in the burner throat 21 of the hydrogen burner 2. In the present embodiment, the supply ports 411 of the plurality of supply pipes 41 are arranged in a ring shape so as to surround the plurality of fuel nozzles 22, so as to supply the developer to the air flow paths 31, 32 in the burner throat 21 in a dispersed manner. According to the arrangement of the supply ports 411 of the supply pipe 41, the developer is added to the combustion air in the primary air flow path 31 and / or the secondary air flow path 32, but the developer may also be added to the combustion air in other flow paths of the combustion air of the hydrogen burner 2 (for example, in the wind box 23).

[0028] The feeder 42 delivers a predetermined amount of the color developer to the supply pipe 41. The method of delivering the powdered color developer by the feeder 42 is not particularly limited, and examples thereof include a method of delivering by air, a method of delivering by vibration, and a method of delivering by a screw. As the feeder 42, a powder feeder of a known structure can be used. The operating member 43 is electrically connected to the feeder 42, and when the operating member 43 is turned on, the feeder 42 is triggered to operate.

[0029] <Visual confirmation method of hydrogen flame>

[0030] In the hydrogen combustion device 1 of the above structure, the hydrogen flame can be visualized at any time during the combustion of hydrogen in the hydrogen burner 2. Usually, the developer adding device 4 is stopped. When the operator turns on the operating member 43 of the developer adding device 4, the turn-on command is transmitted to the feeder 42. The feeder 42 that receives the turn-on command delivers a predetermined amount of developer to the supply pipe 41. Thus, the developer coming out of the supply port 411 of the supply pipe 41 is added to the combustion air flowing in the air flow path 31, 32 in the burner throat 21 of the hydrogen burner 2. The developer is transported by the combustion air, blown out from the air outlet 30 together with the combustion air, and diffused along with the flow of the combustion air. The developer emits light of the color inherent to the metal contained in the developer by contacting with the hydrogen flame. For example, when sodium chloride is used as the developer, the part of the hydrogen flame that contacts the developer looks yellow. The operator can visually confirm the state of the hydrogen flame by visually confirming the hydrogen flame visualized in this way.

[0031] [Variant 1]

[0032] In the hydrogen combustion device 1 of the above embodiment, the developer is supplied to the air flow paths 31 and 32 in the burner throat 21 of the hydrogen burner 2. However, the method of supplying the developer is not limited thereto as long as the developer can be supplied to the flow path of the combustion air.

[0033] Figure 21 is a diagram showing a schematic structure of a hydrogen combustion device 1 according to a modification example 1. In the hydrogen combustion device 1 according to the modification example 1, components identical or similar to those in the above-mentioned embodiment are denoted by the same reference numerals as in the drawings, and description thereof is omitted. Figure 2 As shown, in the hydrogen combustion device 1 of the modification 1, the supply port 411 of the supply pipe 41 of the developer adding device 4 is arranged in the air supply pipe 25 for supplying combustion air to the hydrogen burner 2. Moreover, the developer supplied from the supply pipe 41 to the air supply pipe 25 is transported by the combustion air flowing in the air supply pipe 25, passes through the air box 23 and the air flow paths 31 and 32 of the burner throat 21, and is blown out from the air blowing port 30 together with the combustion air.

[0034] [Variant 2]

[0035] In the hydrogen combustion device 1 of the above embodiment, the hydrogen burner 2 is a diffusion combustion system, but the hydrogen burner 2 may be a partial premixing combustion system.

[0036] Figure 3 2 is a diagram showing a schematic structure of a hydrogen combustion device 1 according to a second modification. In the hydrogen combustion device 1 according to the second modification, components identical or similar to those in the aforementioned embodiment are denoted by the same reference numerals as in the drawings, and description thereof is omitted. Figure 3 As shown, the hydrogen combustion device 1 of the modification 2 has a partially premixed hydrogen burner 2. The hydrogen combustion device 1 of the modification 2 is a hydrogen burner 2 of the above-mentioned embodiment, in which a premixing fuel nozzle 26 is added to the hydrogen burner 2. The premixing fuel nozzle 26 is a fuel nozzle that sprays hydrogen fuel into the flow of combustion air in the burner throat 21.

[0037] The premixing fuel nozzle 26 has an outlet disposed in at least one of the primary air flow path 31 and the secondary air flow path 32 of the combustor throat 21. In this modification, the outlet of the premixing fuel nozzle 26 is disposed in the air flow path 31, but may be disposed in the secondary air flow path 32.

[0038] In this modification, the premixing fuel nozzle 26 is independent of the fuel nozzle 22, but the premixing fuel nozzle 26 may utilize a portion of the flow path of the fuel nozzle 22. For example, a small hole may be provided in at least one of the fuel nozzles 22 and the small hole may be used as the outlet of the premixing fuel nozzle 26, thereby using one pipe as the fuel nozzle 22 and the premixing fuel nozzle 26.

[0039] The fuel gas blown from the premixing fuel nozzle 26 to the air flow paths 31 and 32 in the burner throat 21 is blown out from the air outlet 30 in a state mixed with the combustion air in the burner throat 21. However, the flow rate of the fuel gas blown from the premixing fuel nozzle 26 is set so that the hydrogen concentration of the premixed gas of the combustion air and the fuel gas in the burner throat 21 is less than the flammable range. The premixed gas of the combustion air and the fuel gas blown from the air outlet 30 of the burner throat 21 is mixed with the fuel gas blown from the fuel nozzle 22 and burns.

[0040] 〔Summarize〕

[0041] The hydrogen combustion device 1 of the first item of the present disclosure comprises: a hydrogen burner 2, which has a burner throat 21 and fuel nozzles 22, 26, the burner throat 21 has air flow paths 31, 32 for the flow of combustion air, the fuel nozzles 22, 26 spray hydrogen fuel into the air flow paths 31, 32 or into the flow of combustion air blown out from the burner throat 21, and the hydrogen burner 2 burns the hydrogen fuel to emit a hydrogen flame; and a color developer adding device 4, which adds a powdered color developer composed of a metal or a metal salt that reacts with the hydrogen flame to produce a flame color to the combustion air.

[0042] In the hydrogen combustion device 1 of the above structure, the hydrogen fuel ejected from the fuel nozzle 22 of the hydrogen burner 2 is mixed with the combustion air and burned to generate a hydrogen flame. The hydrogen flame contacts the color developer blown out together with the combustion air to generate a flame color reaction, and the color developer emits light that can be visually confirmed, thereby making it possible to visualize the hydrogen flame. In the hydrogen combustion device 1, since the powdered color developer is added to the combustion air, no dedicated nozzle for the color developer is provided near the ejection port of the fuel nozzle 22, and it is not necessary to consider the burning of such a nozzle. In addition, the color developer adding device 4 adds the powdered color developer to the flow path of the combustion air, so the color developer adding device 4 can be attached to the hydrogen burner 2 without making a significant design change to the hydrogen burner 2 itself. In addition, in the hydrogen burner 2, combustion occurs in the place where the combustion air exists, and the propagation of the flame occurs. The powdered color developer blown out from the air blowing port 30 is diffused along with the flow of the combustion air, so the color developer and the hydrogen flame can be efficiently contacted. That is, in the hydrogen combustion device 1, there is no need to have a special diffusion unit for the color developer or to adjust the diffusion, and the color developer can be brought into contact with the hydrogen flame to color the hydrogen flame. In this way, in the hydrogen combustion device 1, the visualization of the hydrogen flame can be achieved with a simpler structure than in the prior art.

[0043] The hydrogen combustion device 1 of the second item of the present disclosure is the hydrogen combustion device 1 of the first item, wherein the developer adding device 4 has: a supply pipe 41 having a supply port 411 arranged in the flow path of the combustion air; and a feeder 42 that feeds the developer to the supply pipe 41.

[0044] The hydrogen combustion device 1 according to the third aspect of the present disclosure is the hydrogen combustion device 1 according to the second aspect, wherein the supply pipe 41 of the developer adding device 4 has a supply port 411 disposed in the air flow paths 31 , 32 .

[0045] The hydrogen combustion device 1 of the fourth item of the present disclosure is based on the hydrogen combustion device 1 of the second item, wherein the hydrogen combustion device 1 has an air supply pipe 25 connected to the hydrogen burner 2 and supplies combustion air to the hydrogen burner 2, and the supply pipe 41 of the color developer adding device 4 has a supply port 411 arranged in the air supply pipe 25.

[0046] In the hydrogen combustion apparatus 1 of items 2 to 4, by adding a color developer to the combustion air before mixing with the hydrogen fuel, the combustion air and the color developer are blown out from the air outlet 30 in a pre-mixed state. Thus, the color developer can be more effectively diffused. In addition, in the hydrogen combustion apparatus 1 of items 2 to 4, the color developer adding device 4 can be added without making a significant design change to the hydrogen burner 2 and the air supply pipe 25.

[0047] The hydrogen combustion device 1 of item 5 of the present disclosure is the hydrogen combustion device 1 of any item of items 2 to 4, wherein the developer adding device 4 has an operating member 43, and the feeder 42 is configured to transport a specified amount of developer to the supply pipe 41 according to the operation of the operating member 43.

[0048] In the hydrogen combustion device 1 having the above configuration, the developer adding device 4 operates in response to the operator's operation of the operating element 43, and as a result, the hydrogen flame is visualized. Therefore, the operator can visualize the hydrogen flame at any timing.

[0049] The above discussion of the present disclosure is presented for the purpose of illustration and description, and is not intended to limit the present disclosure to the methods disclosed in this specification. For example, in the above detailed description, various features of the present disclosure are summarized into one embodiment for the purpose of rationalizing the present disclosure, but several of the multiple features may be combined. In addition, the multiple features included in the present disclosure may also be combined with alternative embodiments, structures or methods other than those described above.

Claims

1. A hydrogen combustion device, comprising: A hydrogen burner having a burner throat and a fuel nozzle, wherein the burner throat has an air flow path for combustion air to flow, the fuel nozzle ejecting hydrogen fuel into the air flow path or into the flow of the combustion air blown out from the burner throat, and the hydrogen burner burns the hydrogen fuel to emit a hydrogen flame; and A developer adding device adds a powdered developer composed of a metal or a metal salt that reacts with a hydrogen flame to produce a flame color to the combustion air.

2. The hydrogen combustion device according to claim 1, wherein: The developer adding device comprises: a supply pipe having a supply port disposed in a flow path of the combustion air; and A feeder delivers the developer to the supply pipe.

3. The hydrogen combustion device according to claim 2, wherein: The supply pipe of the developer adding device has the supply port arranged in the air flow path.

4. The hydrogen combustion device according to claim 2, wherein: The hydrogen combustion device includes an air supply pipe connected to the hydrogen burner and supplying the combustion air to the hydrogen burner. The supply pipe of the developer adding device has the supply port arranged in the air supply pipe.

5. The hydrogen combustion device according to any one of claims 2 to 4, wherein: The developer adding device includes an operating element, and the feeder is configured to feed a predetermined amount of the developer to the supply pipe in response to an operation of the operating element.

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