Ammonia thermal decomposition equipment

Abstract

To provide an ammonia thermal dissolution device which can effectively dissolute an ammonia to hydrogen and nitrogen in order to use the ammonia as the fuel of an industrial furnace burner, and can suppress the discharge of a nitrogen oxide.SOLUTION: The ammonia thermal dissolution device is a device which is disposed at a prescribed portion of a first piping 11 to which the ammonia is supplied in an industrial furnace 1 for combusting a gas ammonia which is supplied to a burner 10 together with combustion air by a flame F from the burner 10 and comprises: a heating part 100 for heating the ammonia which passes through the inside of first piping 11; liquid ammonia piping 70 inserted into an end part of the heating part 100 to supply a liquid ammonia, and having an inner diameter smaller than the first piping 11; an injection nozzle 80 disposed at a tip of the liquid ammonia piping 70 which is inserted into the heating part 100; and a compression part 200 disposed at this side of the heating part 100 of the liquid ammonia piping 70, and compressing the liquid ammonia in the liquid ammonia piping 70.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an ammonia thermal decomposition apparatus that is attached to an industrial furnace that burns ammonia as fuel. [Background technology]

[0002] In recent years, ammonia has been attracting attention as a new fuel from the perspective of curbing global warming, as it does not produce carbon dioxide when burned. However, when ammonia is mixed with fossil fuels or burned alone, nitrogen oxides (NO X It is known that the amount of emissions of ) increases (see, for example, Patent Document 1).

[0003] The combustion device described in Patent Document 1 solves the problem of increased nitrogen oxides when coal is burned with ammonia added.

[0004] Although ammonia has been attracting attention as a new fuel, there have been no industrial furnaces that effectively use ammonia as fuel, and the technology is currently in the research and development stage. In general, the combustion speed of ammonia is about 25% of that of natural gas, and when burned, nitrogen oxides (NO X This is because the amount of CO2 emissions has increased to a level higher than the regulated value (180 ppm, O2=11%), making it unusable as fuel.

[0005] It is now beginning to be discovered that when the hydrogen content of ammonia gas is around 30%, it has a burning speed similar to that of natural gas, and even at around 20%, it has a burning speed that can be used without any problems in practical applications.

[0006] To use ammonia as fuel for the burners of industrial furnaces, the ammonia must be decomposed into hydrogen and nitrogen, but such equipment does not currently exist. Therefore, industrial furnaces still have to rely on fossil fuels, and as a result, they are unable to reduce the emission of greenhouse gases (nitrogen oxides).

[0007] Furthermore, when comparing the transportation of ammonia in gaseous state with the transportation of ammonia in liquid state, the inner diameter of the gas piping is about 30 to 40 mm, or at least 15 mm, while the inner diameter of the liquid piping is about 4 mm. Therefore, it is possible to make the equipment more compact by using the liquid piping from the tank that supplies liquid ammonia as close as possible to the burner. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 7020759 Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, an object of the present invention is to provide an ammonia thermal decomposition apparatus that can effectively decompose ammonia into hydrogen and nitrogen and suppress the emission of nitrogen oxides in order to use ammonia as fuel for the burners of industrial furnaces. [Means for solving the problem]

[0010] In order to achieve the above object, an ammonia thermal decomposition apparatus (50) of the present invention is an apparatus provided in an industrial furnace (1) in which gaseous ammonia supplied to a burner (10) together with combustion air is combusted by a flame (F) from the burner (10), the apparatus being provided at a predetermined portion of a first pipe (11) to which the ammonia is supplied, a heating section (100) that heats ammonia passing through the first pipe (11); a liquid ammonia pipe (70) having an inner diameter smaller than that of the first pipe (11), the liquid ammonia pipe (70) being inserted into an end of the heating part (100) opposite to the burner (10) side and supplying liquid ammonia; an injection nozzle (80) provided at a tip of the liquid ammonia pipe (70) inserted into the heating section (100); a pressurizing section (200) provided in front of the heating section (100) of the liquid ammonia pipe (70) for pressurizing the liquid ammonia in the liquid ammonia pipe (70); Preparation, Furthermore, the liquid ammonia pipe (70) located between the heating section (100) and the pressurizing section (200) is provided with a heater (90) for heating the liquid ammonia inside the liquid ammonia pipe (70). It is characterized by:

[0012] The present invention also provides 1. An industrial furnace (1) in which gaseous ammonia supplied to a burner (10) together with combustion air is combusted by a flame (F) from the burner (10), the device being provided at a predetermined portion of a first pipe (11) to which the ammonia is supplied, a heating section (100) that heats ammonia passing through the first pipe (11); a liquid ammonia pipe (70) having an inner diameter smaller than that of the first pipe (11), the liquid ammonia pipe (70) being inserted into an end of the heating part (100) opposite to the burner (10) side and supplying liquid ammonia; an injection nozzle (80) provided at a tip of the liquid ammonia pipe (70) inserted into the heating section (100); a pressurizing section (200) that is provided upstream of the heating section (100) in the liquid ammonia pipe (70) and that pressurizes the liquid ammonia in the liquid ammonia pipe (70), A heated air pipe (300) is provided to supply heated air from the end of the heating section (100) to the injection nozzle (80).

[0013] The present invention also provides an apparatus for an industrial furnace (1) in which gaseous ammonia supplied to a burner (10) together with combustion air is combusted by a flame (F) from the burner (10), the apparatus being provided at a predetermined portion of a first pipe (11) to which the ammonia is supplied, the apparatus comprising: a heating section (100) that heats ammonia passing through the first pipe (11); a liquid ammonia pipe (70) having an inner diameter smaller than that of the first pipe (11), the liquid ammonia pipe (70) being inserted into an end of the heating part (100) opposite to the burner (10) side and supplying liquid ammonia; an injection nozzle (80) provided at a tip of the liquid ammonia pipe (70) inserted into the heating section (100); a pressurizing section (200) provided in the liquid ammonia pipe (70) upstream of the heating section (100) and configured to pressurize the liquid ammonia in the liquid ammonia pipe (70); an on-off control valve (17) provided in the first pipe (11); The predetermined portion is between the burner (10) and the regulating valve (17). can be, The liquid ammonia pipe (70) located between the heating section (100) and the pressurizing section (200) is provided with a heater (90) for heating the liquid ammonia inside the liquid ammonia pipe (70). It is characterized by: The present invention also provides an apparatus for an industrial furnace (1) in which gaseous ammonia supplied to a burner (10) together with combustion air is combusted by a flame (F) from the burner (10), the apparatus being provided at a predetermined portion of a first pipe (11) to which the ammonia is supplied, the apparatus comprising: a heating section (100) that heats ammonia passing through the first pipe (11); a liquid ammonia pipe (70) having an inner diameter smaller than that of the first pipe (11), the liquid ammonia pipe (70) being inserted into an end of the heating part (100) opposite to the burner (10) side and supplying liquid ammonia; an injection nozzle (80) provided at a tip of the liquid ammonia pipe (70) inserted into the heating section (100); a pressurizing section (200) that is provided upstream of the heating section (100) in the liquid ammonia pipe (70) and that pressurizes the liquid ammonia in the liquid ammonia pipe (70), the predetermined portion is within a range of 2 m from a connection position (P) of the first pipe (11) to the burner (10), The liquid ammonia pipe (70) located between the heating section (100) and the pressurizing section (200) is provided with a heater (90) for heating the liquid ammonia inside the liquid ammonia pipe (70). It is characterized by:

[0014] The present invention also provides an apparatus for an industrial furnace (1) in which gaseous ammonia supplied to a burner (10) together with combustion air is combusted by a flame (F) from the burner (10), the apparatus being provided at a predetermined portion of a first pipe (11) to which the ammonia is supplied, the apparatus comprising: a heating section (100) that heats ammonia passing through the first pipe (11); a liquid ammonia pipe (70) having an inner diameter smaller than that of the first pipe (11), the liquid ammonia pipe (70) being inserted into an end of the heating part (100) opposite to the burner (10) side and supplying liquid ammonia; an injection nozzle (80) provided at a tip of the liquid ammonia pipe (70) inserted into the heating section (100); a pressurizing section (200) provided in the liquid ammonia pipe (70) upstream of the heating section (100) and configured to pressurize the liquid ammonia in the liquid ammonia pipe (70); an on-off control valve (17) provided in the first pipe (11); the predetermined portion is between the burner (10) and the regulating valve (17); A heated air pipe (300) is provided to supply heated air from the end of the heating section (100) to the injection nozzle (80). The present invention also provides an apparatus for an industrial furnace (1) in which gaseous ammonia supplied to a burner (10) together with combustion air is combusted by a flame (F) from the burner (10), the apparatus being provided at a predetermined portion of a first pipe (11) to which the ammonia is supplied, the apparatus comprising: a heating section (100) that heats ammonia passing through the first pipe (11); a liquid ammonia pipe (70) having an inner diameter smaller than that of the first pipe (11), the liquid ammonia pipe (70) being inserted into an end of the heating part (100) opposite to the burner (10) side and supplying liquid ammonia; an injection nozzle (80) provided at a tip of the liquid ammonia pipe (70) inserted into the heating section (100); a pressurizing section (200) that is provided upstream of the heating section (100) in the liquid ammonia pipe (70) and that pressurizes the liquid ammonia in the liquid ammonia pipe (70), The predetermined portion is within a range of 2 m from a connection position (P) of the first pipe (11) to the burner (10). can be, A heated air pipe (300) is provided to supply heated air from the end of the heating section (100) to the injection nozzle (80).

[0015] The symbols in parentheses above indicate corresponding elements or matters described in the drawings and in the detailed description of the invention to be described later. [Effects of the Invention]

[0016] According to the ammonia thermal decomposition apparatus of the present invention, the liquid ammonia pipe that supplies liquid ammonia has an inner diameter smaller than that of the first pipe that supplies gaseous ammonia, and when the liquid ammonia in the liquid ammonia pipe is pressurized in the pressurizing section and then injected into the heating section from the injection nozzle, it becomes gaseous ammonia in the first pipe. In the heating section, heat is applied to the ammonia inside the first pipe to heat the ammonia to a predetermined temperature. This heat effectively decomposes the gaseous ammonia into hydrogen and nitrogen, allowing the ammonia (hydrogen) to be used efficiently as fuel for the burner and simultaneously reducing nitrogen oxide emissions.

[0017] According to this, the liquid ammonia pipe (for transporting liquid ammonia), which has a considerably smaller inner diameter than the first pipe for transporting gaseous ammonia, can be used as close as possible to the burner side, for example, between the burner and the adjusting valve provided on the burner side, or up to a location within 2 m from the connection position of the first pipe to the burner, thereby making the entire facility more compact. That is, in the piping before the burner, the amount of the first piping with a large inner diameter used can be reduced, resulting in space saving.

[0018] Furthermore, according to the present invention, a heater for heating the liquid ammonia inside the liquid ammonia pipe located between the heating section and the pressurizing section is provided in the liquid ammonia pipe, so that the liquid ammonia can be heated efficiently.

[0019] Furthermore, according to the present invention, a heated air pipe is provided for supplying heated air from the end of the heating section to the injection nozzle, so that the liquid ammonia can be heated efficiently. [Brief explanation of the drawings]

[0020] [Figure 1]1 is a vertical cross-sectional view showing a main part of an industrial furnace equipped with an ammonia thermal decomposition apparatus according to the present invention. [Figure 2] 1 is an enlarged cross-sectional view showing an ammonia thermal decomposition apparatus according to an embodiment of the present invention. [Figure 3] FIG. 2 is an enlarged cross-sectional view showing another ammonia thermal decomposition apparatus according to an embodiment of the present invention. [Figure 4] FIG. 10 is an enlarged cross-sectional view showing yet another ammonia thermal decomposition apparatus according to an embodiment of the present invention. [Figure 5] 1 is a vertical cross-sectional view showing a main part of another industrial furnace equipped with an ammonia thermal decomposition apparatus according to the present invention. FIG. [Figure 6] 10 is a vertical cross-sectional view showing the main parts of yet another industrial furnace equipped with an ammonia thermal decomposition apparatus according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] An ammonia thermal decomposition apparatus 50 according to an embodiment of the present invention will be described with reference to FIGS.

[0022] The industrial furnace 1 (here, a metal heating furnace will be described as an example) to which the ammonia thermal decomposition apparatus 50 according to this embodiment is attached has a generally rectangular cross section as shown in FIG. 1, and is a furnace in which a burner 10 is provided on a side wall 3 of the furnace wall that constitutes the furnace body 2, and ammonia (NH3) is mixed and burned with gas fuel by flame F from the burner 10.

[0023] Ammonia (NH3) is sent from the ammonia supply device 14 to the burner 10 via a first pipe 11, and an ammonia on-off valve (solenoid valve) 17 is provided along the first pipe 11. As will be described later, the ammonia supply device 14 side of the first pipe 11 is a liquid ammonia pipe 70 for supplying liquid ammonia. The ammonia is supplied to the burner 10 in the form of vaporized ammonia, i.e., gaseous ammonia. The gas fuel is made of existing gas such as city gas or propane gas, and is sent from a gas supply device 15 to the burner 10 via a second pipe 12, and a gas on-off valve (solenoid valve) 18 is provided along the second pipe 12. Combustion air is fresh air sent to the burner 10 by a blower 16 via an air pipe 13, and an air on-off valve (electromagnetic valve) 19 is provided midway along the air pipe 13. The burner 10 extends horizontally and radiates a flame F horizontally (from right to left in FIG. 1).

[0024] Four ammonia injection nozzles (first ammonia injection nozzle, second ammonia injection nozzle, third ammonia injection nozzle, fourth ammonia injection nozzle) 21, 22, 23, 24 are provided at intervals (equally spaced here) in the direction in which flame F extends, i.e., from right to left in FIG. 1 , on the ceiling wall 5 of industrial furnace 1.

[0025] Ammonia supplied from an ammonia supply device 14 is injected from these ammonia injection nozzles 21, 22, 23, and 24 into the furnace via solenoid valves (first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve) 31, 32, 33, and 34, respectively, in a direction perpendicular to the direction in which the flame F extends, i.e., from top to bottom. An ammonia supply pipe 60 for sending ammonia from the ammonia supply device 14 to each of the ammonia injection nozzles 21, 22, 23, and 24 branches off from the first piping 11 between the burner 10 and the ammonia thermal decomposition device 50, and gaseous ammonia flows through this pipe. A flue 20 for discharging exhaust gas is provided in a part of the ceiling wall 5 of the industrial furnace 1.

[0026] The ammonia thermal decomposition apparatus 50 according to this embodiment is attached to an industrial furnace 1 that burns ammonia supplied to the burner 10 together with combustion air and gas fuel using a flame F from the burner 10, and is provided at a predetermined portion of the first piping 11 to which ammonia is supplied.

[0027] As shown in FIG. 1 , the ammonia thermal decomposition apparatus 50 is provided in the first piping 11 between the burner 10 and the ammonia on-off valve 17, and gaseous ammonia output from the ammonia thermal decomposition apparatus 50 is supplied to the burner 10 via the first piping 11, and is also supplied from the ammonia supply pipe 60 to the ammonia injection nozzles 21, 22, 23, and 24 via the first solenoid valve 31, the second solenoid valve 32, the third solenoid valve 33, and the fourth solenoid valve 34. The ammonia thermal decomposition device 50 is arranged immediately before the burner 10, in this case within a range of 2 m from the connection position P of the first pipe 11 to the burner 10.

[0028] As shown in FIG. 2 , the ammonia thermal decomposition apparatus 50 includes a heating section 100 that heats the ammonia passing through the inside of the first piping 11, a liquid ammonia piping 70 that is inserted into the end of the heating section 100 opposite to the burner 10 side and that supplies liquid ammonia from the ammonia supplier 14, an injection nozzle 80 that is provided at the tip of the liquid ammonia piping 70 inserted into the heating section 100, and a pressurizing section 200 that is provided on the liquid ammonia piping 70 before the heating section 100 and that pressurizes the liquid ammonia in the liquid ammonia piping 70.

[0029] The heating unit 100 may have any configuration as long as it heats and thermally decomposes gaseous ammonia in the first pipe 11 to generate hydrogen gas, but here it is made up of a direct heating heater H1 provided inside the first pipe 11, a heat insulating member T provided so as to surround the first pipe 11 from the outside, and a catalyst C provided inside the first pipe 11 to decompose the ammonia into hydrogen and nitrogen. Here, the ammonia gas is heated to 200°C or higher to thermally decompose the ammonia gas and generate hydrogen gas. The direct heater H1 is disposed in a central portion within a predetermined portion of the first pipe 11, and is disposed so that its entire surface (front, rear, and outer circumferential surfaces) directly contacts the gaseous ammonia passing through the first pipe 11. The material of the heat-insulating member T is not limited, but common materials such as glass wool and rock wool can be used. The catalyst C is not particularly limited, but alumina is used in this embodiment. Alumina has the advantage of being less expensive than other catalysts C (e.g., ruthenium-based metals). Therefore, the ammonia thermal decomposition apparatus 50 can be manufactured inexpensively. Using alumina as the catalyst C can prevent the first pipe 11 from being corroded by ammonia or oxidized by heat, thereby improving the physical stability of the ammonia thermal decomposition apparatus 50. In addition to alumina and ruthenium-based catalysts, high-entropy alloys composed of Co, Mo, Fe, Ni, or Cu, as well as metal amides and imides, can be used as the catalyst C.

[0030] Instead of or in addition to providing catalyst C in the first pipe 11, it is also possible to coat the inner surface of the first pipe 11 with a layer of catalyst C, or to form part of the first pipe 11 with catalyst C. Furthermore, an indirect heater may be provided on the outer peripheral surface side of the first pipe 11 to indirectly heat the gaseous ammonia through the first pipe 11 . The direct heater H1 can be covered with a cover made of a catalyst C (for example, alumina) to further enhance the catalytic effect.

[0031] The inner diameter of the liquid ammonia pipe 70 that transports ammonia in a liquid state is 4 mm, which is considerably smaller than the inner diameter (30 to 40 mm) of the first pipe 11 that transports ammonia in a gas state. Here, the portion of first piping 11 connecting between ammonia thermal decomposition apparatus 50 and burner 10, including the portion inside heating section 100 of ammonia thermal decomposition apparatus 50, is a flow path for transporting gaseous ammonia and has a large inner diameter, while the portion of first piping 11 connecting ammonia supply device 14 to ammonia thermal decomposition apparatus 50 is a flow path for transporting liquid ammonia as liquid ammonia piping 70 and has a small inner diameter. The injection nozzle 80 sprays the ammonia passing through the liquid ammonia pipe 70 into the heating section 100 in the form of a mist, and the mist of ammonia vaporizes in the heating section 100 to become gaseous ammonia.

[0032] The pressurizing unit 200 pressurizes the inside of the liquid ammonia pipe 70 to 8 to 30 atmospheres and heats the liquid ammonia to 30 to 50°C. For example, liquid ammonia has a boiling point of 40°C at 17 atmospheres, so if the pressure is increased to 20 atmospheres, it can be heated to 40°C, at which point the ammonia remains in a liquid state (the boiling point of ammonia increases as the pressure increases).

[0033] Furthermore, a heater 90 for heating the liquid ammonia inside the liquid ammonia pipe 70 is provided in the portion of the liquid ammonia pipe 70 located between the heating unit 100 and the pressurizing unit 200 .

[0034] Furthermore, a heated air pipe 300 is provided from the end of the heating section 100 to supply heated air to the injection nozzle 80 provided within the heating section 100 .

[0035] According to the ammonia thermal decomposition apparatus 50 configured in this manner, the liquid ammonia supplied from the ammonia supply device 14 is pressurized to, for example, 20 atmospheres by the pressurizing section 200, and heated to 40°C by the heater 90 to become liquid ammonia. The pressurized and heated liquid ammonia is injected into the first pipe 11 of the heating unit 100 from the injection nozzle 80 provided at the tip of the liquid ammonia pipe 70. At this time, since the pressure inside the first pipe 11 is 1 atmosphere, the ammonia injected from the injection nozzle 80 is instantly vaporized into ammonia gas. When the gaseous ammonia is heated to 200° C. or higher by the heating unit 100, the ammonia gas is thermally decomposed to generate hydrogen gas. This allows ammonia to be easily decomposed into hydrogen and nitrogen, and the ammonia (hydrogen) can be effectively used as fuel for the burner 10, while simultaneously reducing the emission of nitrogen oxides.

[0036] According to the findings of the inventors, the decomposition of ammonia into hydrogen and nitrogen is promoted when heated to 200°C or higher, and the ammonia spontaneously decomposes when heated to 1000°C or higher. Catalyst C such as alumina also effectively promotes the decomposition of ammonia. Therefore, the ammonia thermal decomposition apparatus 50 according to this embodiment is set to heat ammonia to 200°C or higher and controls the temperature to effectively decompose ammonia through the action of this heat and the action of the catalyst C (alumina). For this reason, the ammonia thermal decomposition apparatus 50 is suitable for use in an industrial furnace 1 with a heating temperature of less than 1000°C.

[0037] According to this, the liquid ammonia piping 70 for transporting liquid ammonia, which has an inner diameter considerably smaller than that of the first piping 11 for transporting gaseous ammonia, can be used between the burner 10 and the ammonia on-off valve 17 up to a position as close as possible to the burner 10 side, thereby making it possible to make the entire facility compact. That is, in the piping before the burner 10, the amount of the first piping 11 having a large inner diameter used can be reduced, resulting in space saving.

[0038] In this embodiment, as shown in FIG. 2, heater 90 is provided and heated air is sent from heated air pipe 300 so as to efficiently heat the liquid ammonia in liquid ammonia pipe 70, but if the ammonia injected from injection nozzle 80 in heating unit 100 is reliably vaporized to become gaseous ammonia, it is possible to omit heater 90 as shown in FIG. 3, or to omit heated air pipe 300 as shown in FIG. 4, or even to omit both heater 90 and heated air pipe 300.

[0039] In this embodiment, as shown in FIG. 1, the first to fourth ammonia injection nozzles 21 to 24 are provided on the ceiling wall 5 of the furnace body 2, and gaseous ammonia sent from the ammonia thermal decomposition device 50 via the ammonia supply pipe 60 is made to flow into the furnace. However, as shown in FIG. 5, the first to fourth ammonia injection nozzles 21 to 24, the ammonia supply pipe 60, and the first to fourth solenoid valves 31 to 34 associated therewith may be omitted. Furthermore, as shown in FIG. 5, it is also possible to supply only gaseous ammonia as fuel to the burner 10 together with combustion air, without supplying the gas fuel 15 to the burner 10.

[0040] 6, an ammonia thermal decomposition device 50 may be provided for each ammonia injection nozzle 21, 22, 23, 24 and each solenoid valve 31, 32, 33, 34. In this case, an ammonia supply pipe 60 branches off between the ammonia supply device 14 and the ammonia on-off valve 17, and liquid ammonia flows up to the ammonia thermal decomposition device 50. The portions of the first to fourth ammonia supply pipes 61-64 connecting the ammonia thermal decomposition device 50 and each ammonia injection nozzle 21, 22, 23, 24, including the portion inside the heating section 100 of the ammonia thermal decomposition device 50, serve as flow paths for transporting gaseous ammonia, and their inner diameters are significantly larger than those of the ammonia supply pipe 60 for transporting liquid ammonia. In this case, ammonia thermal decomposition devices 50 are provided at a total of five locations, on the burner 10 side and on the sides of each ammonia injection nozzle 21, 22, 23, and 24, and each ammonia thermal decomposition device 50 is provided with a heater 100 and a pressurizer 200, but it is also possible to provide only one pressurizer 200 at a position (position indicated by S in FIG. 6) closer to the ammonia supplier 14 side from the position where the ammonia supply pipe 60 branches off from the first piping 11, and send the ammonia pressurized there to each ammonia thermal decomposition device 50 (not shown). This allows the number of pressurizers 200 to be reduced from five to one.

[0041] In addition, in the industrial furnace 1 that burns ammonia supplied to the burner 10 together with combustion air, the above-mentioned patent documents do not describe at all an industrial furnace in which the liquid ammonia is vaporized immediately before the burner 10 to make the entire facility compact.

[0042] The ammonia thermal decomposition apparatus 50 according to this embodiment can be used in any field where ammonia is used as fuel (for example, thermal power generation). [Explanation of symbols]

[0043] 1. Industrial furnace 2 Furnace body 3 side wall 5 Ceiling Wall 10 Burner 11 First piping 12 Second piping 13 Air piping 14 Ammonia supply device 15 Gas supply equipment 16 Blower 17 Ammonia on-off valve 18 Gas on-off valve 19 Air on-off valve 20 flue 21 First ammonia injection nozzle 22 Second ammonia injection nozzle 23 Third ammonia injection nozzle 24 No. 4 ammonia injection nozzle 31 First solenoid valve 32 Second solenoid valve 33 Third solenoid valve 34 Fourth solenoid valve 50 Ammonia thermal decomposition equipment 60 Ammonia supply pipe 61 First ammonia supply pipe 62 Second ammonia supply pipe 63 Third ammonia supply pipe 64 No. 4 ammonia supply pipe 70 Liquid ammonia piping 80 spray nozzle 90 Heater 100 Heating section 200 Pressure section 300 Heated air piping C catalyst F flame H1 Direct Heater P Connection position S Pressure machine installation location T Thermal insulation material

Claims

1. 1. An apparatus for use in an industrial furnace in which gaseous ammonia supplied to a burner together with combustion air is combusted with a flame from the burner, the apparatus being provided at a predetermined portion of a first pipe to which the ammonia is supplied, a heating unit that heats ammonia passing through the inside of the first pipe; a liquid ammonia pipe having an inner diameter smaller than that of the first pipe, the liquid ammonia pipe being inserted into an end of the heating unit opposite to the burner side and supplying liquid ammonia; an injection nozzle provided at a tip of the liquid ammonia pipe inserted into the heating unit; a pressurizing unit provided in the liquid ammonia pipe upstream of the heating unit and configured to pressurize the liquid ammonia in the liquid ammonia pipe, The ammonia thermal decomposition apparatus further comprises a heater provided in the liquid ammonia pipe located between the heating unit and the pressurizing unit, the heater heating the liquid ammonia in the liquid ammonia pipe.

2. 1. An apparatus for use in an industrial furnace in which gaseous ammonia supplied to a burner together with combustion air is combusted with a flame from the burner, the apparatus being provided at a predetermined portion of a first pipe to which the ammonia is supplied, a heating unit that heats ammonia passing through the inside of the first pipe; a liquid ammonia pipe having an inner diameter smaller than that of the first pipe, the liquid ammonia pipe being inserted into an end of the heating unit opposite to the burner side and supplying liquid ammonia; an injection nozzle provided at a tip of the liquid ammonia pipe inserted into the heating unit; a pressurizing unit provided in the liquid ammonia pipe upstream of the heating unit and configured to pressurize the liquid ammonia in the liquid ammonia pipe, a heated air pipe for supplying heated air from an end of the heating section to the injection nozzle;

3. 1. An apparatus for use in an industrial furnace in which gaseous ammonia supplied to a burner together with combustion air is combusted with a flame from the burner, the apparatus being provided at a predetermined portion of a first pipe to which the ammonia is supplied, a heating unit that heats ammonia passing through the inside of the first pipe; a liquid ammonia pipe having an inner diameter smaller than that of the first pipe, the liquid ammonia pipe being inserted into an end of the heating unit opposite to the burner side and supplying liquid ammonia; an injection nozzle provided at a tip of the liquid ammonia pipe inserted into the heating unit; a pressurizing unit provided in the liquid ammonia pipe upstream of the heating unit and configured to pressurize the liquid ammonia in the liquid ammonia pipe; an on-off control valve provided in the first pipe; the predetermined portion is between the burner and the regulating valve, an ammonia thermal decomposition apparatus, wherein the liquid ammonia pipe located between the heating unit and the pressurizing unit is provided with a heater for heating the liquid ammonia inside the liquid ammonia pipe.

4. 1. An apparatus for use in an industrial furnace in which gaseous ammonia supplied to a burner together with combustion air is combusted with a flame from the burner, the apparatus being provided at a predetermined portion of a first pipe to which the ammonia is supplied, a heating unit that heats ammonia passing through the inside of the first pipe; a liquid ammonia pipe having an inner diameter smaller than that of the first pipe, the liquid ammonia pipe being inserted into an end of the heating unit opposite to the burner side and supplying liquid ammonia; an injection nozzle provided at a tip of the liquid ammonia pipe inserted into the heating unit; a pressurizing unit provided in the liquid ammonia pipe upstream of the heating unit and configured to pressurize the liquid ammonia in the liquid ammonia pipe, the predetermined portion is within a range of 2 m from a connection position of the first pipe to the burner, an ammonia thermal decomposition apparatus, wherein the liquid ammonia pipe located between the heating unit and the pressurizing unit is provided with a heater for heating the liquid ammonia inside the liquid ammonia pipe.

5. 1. An apparatus for use in an industrial furnace in which gaseous ammonia supplied to a burner together with combustion air is combusted with a flame from the burner, the apparatus being provided at a predetermined portion of a first pipe to which the ammonia is supplied, a heating unit that heats ammonia passing through the inside of the first pipe; a liquid ammonia pipe having an inner diameter smaller than that of the first pipe, the liquid ammonia pipe being inserted into an end of the heating unit opposite to the burner side and supplying liquid ammonia; an injection nozzle provided at a tip of the liquid ammonia pipe inserted into the heating unit; a pressurizing unit provided in the liquid ammonia pipe upstream of the heating unit and configured to pressurize the liquid ammonia in the liquid ammonia pipe; an on-off control valve provided in the first pipe; the predetermined portion is between the burner and the regulating valve, a heated air pipe for supplying heated air from an end of the heating section to the injection nozzle;

6. 1. An apparatus for use in an industrial furnace in which gaseous ammonia supplied to a burner together with combustion air is combusted with a flame from the burner, the apparatus being provided at a predetermined portion of a first pipe to which the ammonia is supplied, a heating unit that heats ammonia passing through the inside of the first pipe; a liquid ammonia pipe having an inner diameter smaller than that of the first pipe, the liquid ammonia pipe being inserted into an end of the heating unit opposite to the burner side and supplying liquid ammonia; an injection nozzle provided at a tip of the liquid ammonia pipe inserted into the heating unit; a pressurizing unit provided in the liquid ammonia pipe upstream of the heating unit and configured to pressurize the liquid ammonia in the liquid ammonia pipe, the predetermined portion is within a range of 2 m from a connection position of the first pipe to the burner, a heated air pipe for supplying heated air from an end of the heating section to the injection nozzle;

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