Apparatus and method for combustion of ammonia
The ammonia combustion device efficiently vaporizes liquid ammonia using combustion heat and adjusts injection based on load conditions, addressing inefficiencies and emissions in conventional burners, achieving stable ammonia combustion with reduced carbon and nitrogen oxide production.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- POSCO HLDG INC
- Filing Date
- 2025-12-01
- Publication Date
- 2026-06-25
AI Technical Summary
Conventional ammonia combustion burners require separate equipment for vaporizing liquid ammonia, leading to increased costs and inefficiencies, and struggle to stably burn ammonia while minimizing carbon emissions and nitrogen oxide production.
An ammonia combustion device that vaporizes liquid ammonia using combustion heat, divides the combustion chamber load into multiple operating modes, and adjusts ammonia gas injection based on load conditions and temperature, using multiple nozzles and solenoid valves to control fuel and ammonia gas injection.
Stable ammonia combustion is achieved with reduced carbon emissions and minimized nitrogen oxide generation by utilizing combustion heat for vaporization and adjusting ammonia gas injection according to load conditions.
Smart Images
Figure KR2025020310_25062026_PF_FP_ABST
Abstract
Description
Ammonia combustion device and method
[0001] The present invention relates to an ammonia combustion apparatus and method for burning (or co-burning) a main fuel and / or ammonia.
[0002] Recently, with increasing interest in the environment and climate, and in line with international trends to reduce carbon emissions, basic plans for carbon neutrality are being legislated in various countries. In the thermal power generation sector, methods are being attempted to mix and burn hydrogen and ammonia with existing fuels as carbon-free fuels. Furthermore, to meet future carbon emission reduction targets, the combustion of hydrogen and ammonia can be expanded across the entire power generation and industrial sectors that utilize combustion facilities.
[0003] Typically, burners used to supply heat in industrial processes such as steelmaking or chemical manufacturing can utilize natural gas (LNG), liquefied petroleum gas (LPG), or by-product gas containing combustible substances emitted from the process as fuel. Since most of these fuels contain carbon, it is expected that ammonia will be replaced by carbon-free fuels and used in burners in the future to meet the demand for carbon emission reduction.
[0004] In conventional burners, when using gaseous fuel, ammonia must be supplied in a gaseous state during ammonia co-firing to prevent unburned fuel caused by ammonia having low combustibility; therefore, ammonia is mainly stored and transported in containers in a liquid state and supplied to the point of use, and for ammonia combustion, the liquid ammonia can be vaporized into a gaseous state and supplied to the burner.
[0005] However, in order to burn ammonia using a conventional ammonia combustion burner in this manner, energy is used to vaporize the liquid ammonia, which requires separate equipment and consequently leads to problems such as increased costs.
[0006] One embodiment of the present invention provides an ammonia combustion device and method that can vaporize liquid ammonia into ammonia gas using combustion heat from a flame when operating a burner, and divides the combustion chamber load condition, such as initial load rise and rated load, into a plurality of operating modes and appropriately adjusts the amount of ammonia gas injected differently for the purpose of reducing carbon emissions, thereby not only reducing carbon emissions but also stably burning ammonia.
[0007] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below.
[0008] According to one aspect of the present invention, an ammonia combustion device is proposed comprising: a fuel injection nozzle configured to inject a first fuel supplied into a combustion chamber; an igniter disposed on an outer part of the fuel injection nozzle and igniting the first fuel injected into the combustion chamber to form a first flame; an air nozzle disposed on the outer side of the fuel injection nozzle and configured to inject combustion air into the first flame; an ammonia nozzle disposed on the outer side of the air nozzle and configured to inject a supplied ammonia gas around the first flame; an ammonia gas-liquid separation tank connected to the ammonia nozzle and configured to store liquid ammonia stored inside, vaporize the liquid ammonia into ammonia gas by thermal energy from the flame, and supply the ammonia gas to the ammonia nozzle; and a controller that controls the injection amount of the first fuel and the ammonia gas in one of a plurality of pre-separated operating modes according to the load condition of the combustion chamber.
[0009] The ammonia combustion device further includes a temperature measuring instrument that detects the internal temperature of the combustion chamber and provides the detected temperature; and the controller is configured to determine the combustion chamber load state based on the detected temperature and to determine one of a plurality of first, second, third, and fourth operating modes that are pre-classified according to the combustion chamber load state.
[0010] The ammonia combustion device further includes a gas meter that measures the concentration of nitrogen oxides and / or unburned ammonia based on the exhaust gas discharged from the combustion furnace; and the controller is configured to control the injection amount of the first fuel and the ammonia gas based on the concentration of nitrogen oxides and / or unburned ammonia.
[0011] The ammonia nozzle is configured to include: a first ammonia nozzle disposed outside the air nozzle and configured to inject a first ammonia gas to form a second flame around the first flame by receiving the ammonia gas; and a second ammonia nozzle disposed outside the first ammonia nozzle and configured to inject a second ammonia gas to form a third flame adjacent to the second flame by receiving the ammonia gas.
[0012] The above ammonia gas-liquid separation tank is configured to include: a first gas-liquid separation tank connected to at least the first ammonia nozzle and comprising a first heat exchanger that transfers heat from a heater into the interior, and configured to vaporize a stored first liquid ammonia into a first ammonia gas by the heat from the first heat exchanger; and a second gas-liquid separation tank connected to at least the second ammonia nozzle and comprising a second heat exchanger that transfers thermal energy from the flame formed in the combustion furnace into the interior, and configured to vaporize a second liquid ammonia into a second ammonia gas by the heat from the second heat exchanger.
[0013] The above ammonia combustion device is configured to include: a main solenoid valve disposed in a first pipe of the first fuel to regulate the supply amount of the first fuel; a first ammonia gas solenoid valve installed in a first ammonia gas pipe connecting the first gas-liquid separation tank and the first ammonia nozzle, wherein the opening rate is adjusted according to a control signal, and the first ammonia gas solenoid valve includes a first outlet valve installed on the outlet side of the first gas-liquid separation tank and a first inlet valve installed on the inlet side of the first ammonia nozzle; and a second ammonia gas solenoid valve installed in a second ammonia gas pipe connecting the second gas-liquid separation tank and the second ammonia nozzle, wherein the opening rate is adjusted according to a control signal, and the second ammonia gas solenoid valve includes a second outlet valve installed on the outlet side of the second gas-liquid separation tank and a second inlet valve installed on the inlet side of the second ammonia nozzle.
[0014] The above ammonia combustion device is configured to further include a third electronic valve installed in a third ammonia gas pipe connecting the first ammonia gas pipe and the second ammonia gas pipe, the opening rate of which is adjusted according to a control signal.
[0015] The controller comprises: a first operating mode control unit that controls the main electronic valve to inject only the first fuel into the combustion chamber by performing a first operating mode when the detected temperature is below a first reference temperature; a second operating mode control unit that controls the main electronic valve and the first ammonia gas electronic valve to inject the first fuel and the first ammonia gas into the combustion chamber by performing a second operating mode when the detected temperature exceeds the first reference temperature and is below a second reference temperature; and a third operating mode control unit that controls the main electronic valve, the first ammonia gas electronic valve, and the second ammonia gas electronic valve to inject the first fuel, the first ammonia gas, and the second ammonia gas into the combustion chamber by performing a third operating mode when the detected temperature exceeds the second reference temperature and is below a third reference temperature. and a fourth operating mode control unit that controls the main electronic valve and the second ammonia gas electronic valve to perform a fourth operating mode when the detected temperature exceeds a third reference temperature, thereby blocking the supply of the first ammonia gas and injecting the first fuel and the second ammonia gas into the combustion chamber; is configured to include
[0016] Additionally, according to another aspect of the present invention, an ammonia combustion method is proposed comprising: a fuel injection nozzle for injecting a first fuel into a combustion chamber; an igniter disposed on an outer portion of the fuel injection nozzle; an air nozzle disposed on the outer side of the fuel injection nozzle; a first ammonia nozzle disposed on the outer side of the air nozzle; a second ammonia nozzle disposed on the outer side of the first ammonia nozzle; a first gas-liquid separation tank for supplying a first ammonia gas to at least the first ammonia nozzle; and a second gas-liquid separation tank for supplying a second ammonia gas to at least the second ammonia nozzle, the method comprising: a combustion load monitoring step for monitoring a combustion chamber load state based on a detected temperature of the combustion chamber; and an operating mode control step for determining one of a plurality of pre-separated operating modes according to the combustion chamber load state, and controlling the injection amount of the first fuel, the first ammonia gas, and the second ammonia gas according to the determined operating mode.
[0017] The above operating mode control step comprises: a first operating mode control step in which, if the detected temperature of the combustion chamber is below a first reference temperature, a first operating mode is performed to form a first flame by controlling the main electronic valve to inject only the first fuel into the combustion chamber through the fuel injection nozzle; and a second operating mode control step in which, if the detected temperature exceeds the first reference temperature and is below a second reference temperature, a second operating mode is performed to form the first flame and the second flame by controlling the main electronic valve and the first ammonia gas electronic valve to inject the first fuel through the fuel injection nozzle and the first ammonia gas through the first ammonia nozzle into the combustion chamber. The method is configured to include: a third operation mode control step in which, if the detected temperature exceeds a second reference temperature and is below a third reference temperature, a third operation mode is performed to form the flame, the second flame, and the third flame by controlling the main electronic valve, the first ammonia gas electronic valve, and the second ammonia gas electronic valve to inject the first fuel through the fuel injection nozzle, the first ammonia gas through the first ammonia nozzle, and the second ammonia gas through the second ammonia nozzle into the combustion chamber; and a fourth operation mode control step in which, if the detected temperature exceeds a third reference temperature, a fourth operation mode is performed to cut off the supply of the first ammonia gas and to form the first flame and the third flame by controlling the main electronic valve and the second ammonia gas electronic valve to inject the first fuel through the fuel injection nozzle and the second ammonia gas through the second ammonia nozzle into the combustion chamber.
[0018] The third operating mode control step is configured such that the controller controls the flow rate ratio of the first ammonia gas and the second ammonia gas based on the nitrogen oxide concentration and / or unburned ammonia concentration analyzed by the gas meter.
[0019] Furthermore, the aspects of the present invention are not limited to those exemplified above, and other aspects may be additionally understood during the process of the following description.
[0020] According to one aspect of the present invention, liquid ammonia can be vaporized into ammonia gas using combustion heat from a flame when the burner is operated, and by dividing the combustion chamber load condition into a plurality of operating modes according to the initial load rise and rated load, and by appropriately adjusting the amount of ammonia gas injected for the purpose of reducing carbon emissions, it is possible to not only reduce carbon emissions but also to stably combust ammonia and control the generation of nitrogen oxides (NOx) and unburned ammonia.
[0021] The various and beneficial advantages and effects of the present invention are not limited to those described above, and other unmentioned technical effects may be more easily understood from the description below in the process of explaining specific embodiments of the present invention.
[0022] FIG. 1 is an exemplary diagram of the configuration of an ammonia combustion device according to one embodiment of the present invention.
[0023] Figure 2 is an example diagram of a temperature measuring instrument and controller.
[0024] Figure 3 is an example diagram of a gas meter, a temperature meter, and a controller.
[0025] FIG. 4 is an example diagram of an ammonia nozzle, an ammonia gas-liquid separation tank, a main solenoid valve, a first ammonia liquid valve, a second ammonia liquid valve, a first ammonia gas solenoid valve, and a second ammonia gas solenoid valve.
[0026] Figure 5 is an example diagram of a third electronic valve.
[0027] Figure 6 is an example diagram of the configuration of a controller.
[0028] FIG. 7 is a flowchart illustrating an ammonia combustion method according to one embodiment of the present invention.
[0029] Figure 8 is an example diagram of the configuration of the driving mode control step.
[0030] FIG. 9 is an explanatory diagram of the operation of the first driving mode stage.
[0031] FIG. 10 is an explanatory diagram of the operation of the second driving mode stage.
[0032] FIG. 11 is an explanatory diagram of the operation of the third driving mode stage.
[0033] FIG. 12 is an explanatory diagram of the operation of the fourth driving mode stage.
[0034] FIG. 13 is an explanatory diagram of the flow rate control operation for ammonia gas in the third operating mode stage.
[0035] FIG. 14 is a block diagram of a computing device capable of wholly or partially implementing an ammonia combustion device and method according to one embodiment of the present invention.
[0036] In the drawings and detailed description, the same reference numerals refer to the same components. The drawings may not be to scale, and the relative sizes, proportions, and depictions of drawing elements may be exaggerated for clarity, illustrative purposes, and convenience.
[0037] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to facilitate a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, this is merely illustrative and the present invention is not limited thereto.
[0038] In describing the embodiments of the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions might unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions within the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification. Terms used in the detailed description are intended merely to describe the embodiments of the present invention and should not be limiting in any way. Unless explicitly stated otherwise, expressions in the singular form include the meaning of the plural form. In this description, expressions such as "include" or "comprise" are intended to refer to certain characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof, and should not be interpreted to exclude the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, parts thereof, or combinations thereof other than those described.
[0039] Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings.
[0040] FIG. 1 is an exemplary diagram of the configuration of an ammonia combustion device according to one embodiment of the present invention.
[0041] Referring to FIG. 1, an ammonia combustion device (1) according to one embodiment of the present invention may include a fuel injection nozzle (100), an air nozzle (200), an igniter (20), an ammonia nozzle (300), an ammonia gas-liquid separation tank (500), and a controller (800).
[0042] The fuel injection nozzle (100) can inject a first fuel into the combustion chamber (10). For example, the first fuel (F1) can be supplied from the first fuel storage (5) and can be natural gas (LNG), liquefied petroleum gas (LPG), or byproduct gas. As an example, the first fuel (F1) can be supplied from the first fuel storage (5) to the fuel injection nozzle (100) through the main electronic valve (VL1).
[0043] An igniter (20) may be positioned on an outer part of the fuel injection nozzle (100) and may ignite the first fuel injected into the combustion chamber (10) to form a first flame (11).
[0044] An air nozzle (200) may be positioned outside the fuel injection nozzle (100) and may inject combustion air (Air) into the first flame (11). For example, an air blower fan (not shown) that operates in conjunction with the start of combustion operation may be installed in the air nozzle (200), and air may be injected into the combustion chamber (10) through the air nozzle (200) by the air blower fan.
[0045] The ammonia nozzle (300) can be positioned outside the air nozzle (200) and can spray supplied ammonia (NH3) gas (AG) (AG1, AG2) around the first flame (11), and accordingly, second and third ammonia flames (12, 13) can be formed around the first flame (11). This will be further explained with reference to FIG. 4.
[0046] The ammonia gas-liquid separation tank (500) can be connected to the ammonia nozzle (300) via an ammonia gas pipe (P10-P20, see FIG. 4) and can store liquid ammonia (LA) (LA1, LA2) inside it. In the ammonia gas-liquid separation tank (500), the liquid ammonia (LA) can be vaporized into ammonia gas (AG) by thermal energy from at least one of the first to third flames (11, 12, 13), and the ammonia gas (AG) can be supplied to the ammonia nozzle (300) via the ammonia gas pipe (P10-P20, see FIG. 4). This will be further explained with reference to FIG. 4.
[0047] Additionally, the controller (800) can control the injection amount of the first fuel and the ammonia gas through the main solenoid valve (VL1), the first ammonia gas solenoid valve (VL10), and the second ammonia gas solenoid valve (VL20) in one of a plurality of pre-classified operating modes according to the load state (LS) of the combustion chamber (10). For example, the load state (LS) of the combustion chamber (10) can be determined based on the temperature of the combustion chamber (10). The controller (800) will be further explained with reference to FIGS. 2 to 6.
[0048] In FIG. 1, 6 is a second fuel storage tank for storing a second fuel (F2) which is liquid ammonia (LA), VL2 is a pipe for supplying liquid ammonia from the second fuel storage tank (6) to an ammonia gas-liquid separation tank (500), and VL3 is a pipe connecting the first ammonia gas-liquid separation tank (510) and the second ammonia gas-liquid separation tank (520) included in the ammonia gas-liquid separation tank (500) described with reference to FIG. 4.
[0049] And, 30 is a heater. TT is a temperature transmitter that detects the internal temperature of the first and second ammonia gas-liquid separation tanks (510, 520) and transmits temperature information to the controller (800), PT is a pressure transmitter that detects the internal pressure of the first and second ammonia gas-liquid separation tanks (510, 520) and transmits pressure information to the controller (800), and FT is a flow transmitter that detects the ammonia gas flow rate of the first and second ammonia gas pipes (P10, P20, see FIG. 5) and transmits ammonia gas flow rate information to the controller (800). Accordingly, the controller (800) can monitor the temperature information, pressure information, and flow rate information.
[0050] Figure 2 is an example diagram of a temperature measuring instrument and controller.
[0051] Referring to FIG. 2, the ammonia combustion device (1) may include a temperature measuring instrument (600).
[0052] For example, the temperature measuring instrument (600) may detect the internal temperature to predict the load state of the combustion chamber (10) and provide the detected temperature (Td) to the controller (800). For example, the temperature measuring instrument (600) may include a plurality of temperature sensors (TS1, TS2~TSn) for measuring the temperature at different locations inside the combustion chamber (10). As an example, the plurality of temperature sensors (TS1, TS2~TSn) may be thermocouples, but are not limited thereto.
[0053] The controller (800) determines the combustion chamber load state based on the detected temperature (Td), determines one of a plurality of pre-classified operating modes according to the combustion chamber load state, for example, first, second, third, and fourth operating modes (M1, M2, M3, M4), and controls the injection amount of the first fuel and the ammonia gas according to the determined operating mode. This will be further explained with reference to FIGS. 3 to 6.
[0054] In the following description of the present disclosure, a plurality of operating modes are described, with respect to the first, second, third, and fourth operating modes (M1, M2, M3, M4) as examples; however, this is merely for the convenience of explanation and understanding and is not limited thereto.
[0055] Figure 3 is an example diagram of a gas meter, a temperature meter, and a controller.
[0056] Referring to FIG. 3, the ammonia combustion device (1) may include a gas detector (700).
[0057] For example, the gas meter (700) can measure the concentration of nitrogen oxides and / or unburned ammonia based on the exhaust gas discharged from the combustion chamber (10), and can provide information regarding the concentration of nitrogen oxides and / or unburned ammonia measured in this way to the controller (800).
[0058] The controller (800) can control the injection amount of the first fuel and the ammonia gas based on the nitrogen oxide concentration and / or unburned ammonia concentration through the main solenoid valve (VL1), the first ammonia gas solenoid valve (VL10), and the second ammonia gas solenoid valve (VL20).
[0059] For example, when the combustion operation is started, the controller (800) controls the main electronic valve (VL1) to be in an open state so that the first fuel (F1) is supplied from the first fuel storage (5) to the fuel injection nozzle (100) through the first pipe (P1) and then injected into the combustion chamber (10).
[0060] Additionally, the controller (800) controls the first liquid ammonia valve (VL2) to an open state so that the second fuel (F2) can be supplied from the second fuel storage tank (6) to the ammonia gas-liquid separation tank (500) through the first liquid ammonia pipe (P2), and the first ammonia gas-liquid separation tank (510, see FIG. 4) can be heated by a heater (30) to vaporize the liquid ammonia and supply the ammonia gas generated to the ammonia nozzle (300) through the ammonia gas pipe (P10, see FIG. 4). Additionally, the ammonia gas-liquid separation tank (520, see FIG. 4) supplies ammonia gas, which is generated by vaporizing liquid ammonia by the combustion heat of the combustion chamber (10), to the ammonia nozzle (300) through the ammonia gas pipe (P20, see FIG. 4), and accordingly, the ammonia gas can be injected into the combustion chamber (10) by the ammonia nozzle (300).
[0061] FIG. 4 is an example diagram of an ammonia nozzle, an ammonia gas-liquid separation tank, a main solenoid valve, a first ammonia liquid valve, a second ammonia liquid valve, a first ammonia gas solenoid valve, and a second ammonia gas solenoid valve.
[0062] Referring to FIG. 4, the ammonia nozzle (300) may include a first ammonia nozzle (310) and a second ammonia nozzle (320).
[0063] The first ammonia nozzle (310) is positioned outside the air nozzle (200) and can supply the ammonia (NH3) gas to form a second flame (12) around the first flame (11) of the combustion chamber (10) by injecting the first ammonia gas (AG1) around the first flame (11).
[0064] And, the second ammonia nozzle (320) is positioned outside the first ammonia nozzle (310) and can inject the second ammonia gas (AG2) adjacent to the second flame (12) of the combustion chamber (10) to form a third flame (13) adjacent to the second flame (12) by receiving the ammonia (NH3) gas.
[0065] Additionally, the ammonia gas-liquid separation tank (500) may include a first gas-liquid separation tank (510) and a second gas-liquid separation tank (520).
[0066] The first gas-liquid separation tank (510) may include a first heat exchanger (511) that is connected to at least the first ammonia nozzle (310) and transfers heat from the heater (30) into the interior. The first liquid ammonia (LA1) stored by the heat from the first heat exchanger (511) may be vaporized into a second ammonia gas (AG1).
[0067] Additionally, the second gas-liquid separation tank (520) may include a second heat exchanger (521) that is connected to at least the second ammonia nozzle (320) and transfers thermal energy from the flame (11) formed in the combustion chamber (10) into the interior. The second liquid ammonia (LA2) may be vaporized into the second ammonia gas (AG2) by the heat from the second heat exchanger (521). That is, the second liquid ammonia (LA2) may be vaporized into the second ammonia gas (AG2) in the second gas-liquid separation tank (520) using thermal energy from at least the first flame (11) formed in the combustion chamber (10). As an example, the second gas-liquid separation tank (520) may receive liquid ammonia from the first gas-liquid separation tank (510) through a pipe (P3, see FIG. 5) and an electronic valve (VL3, see FIG. 5).
[0068] Additionally, referring to FIG. 4, the ammonia combustion device (1) may include a main electronic valve (VL1), a first ammonia gas electronic valve (VL10), and a second ammonia gas electronic valve (VL20).
[0069] The main electronic valve (VL1) is positioned in the first pipe (P1) connecting the first fuel storage (5) and the fuel injection nozzle (100), and can adjust the supply amount of the first fuel (F1) supplied from the first fuel storage (5) to the fuel injection nozzle (100) through the first pipe (P1) according to the control of the controller (800).
[0070] The first ammonia gas solenoid valve (VL10) may be installed in the first ammonia gas piping (P10) connecting the first gas-liquid separation tank (510) and the first ammonia nozzle (310), and the opening rate may be adjusted according to a control signal from a controller (800), and may include a first outlet valve (VL11) and a first inlet valve (VL12). For example, the first outlet valve (VL11) may be installed on the outlet side of the first gas-liquid separation tank (510), and the first inlet valve (VL12) may be installed on the inlet side of the first ammonia nozzle (310), and each of the first outlet valve (VL11) and the first inlet valve (VL12) may be individually controlled according to the control of the controller (800).
[0071] Additionally, the second ammonia gas solenoid valve (VL20) may be installed in the second ammonia gas piping (P20) connecting the second gas-liquid separation tank (520) and the second ammonia nozzle (320), and the opening rate may be adjusted according to a control signal from the controller (800), and may include a second outlet valve (VL21) and a second inlet valve (VL22). For example, the second outlet valve (VL21) may be installed on the outlet side of the second gas-liquid separation tank (520). The second inlet valve (VL22) may be installed on the inlet side of the second ammonia nozzle (320), and each of the second outlet valve (VL21) and the second inlet valve (VL22) may be individually controlled according to the control of the controller (800).
[0072] Figure 5 is an example diagram of a third electronic valve.
[0073] Referring to FIG. 5, the ammonia combustion device (1) may further include a third electronic valve (VL30).
[0074] For example, the third electronic valve (VL30) is installed in the third ammonia gas pipe (P30) connecting the first ammonia gas pipe (P10) and the second ammonia gas pipe (P20), and the opening rate can be adjusted according to the control signal of the controller (800).
[0075] For example, the third solenoid valve (VL30) can supply ammonia gas from the first ammonia gas-liquid separation tank (510) through the first outlet valve (VL11) which is in an open state to the second ammonia nozzle (320) through the second inlet valve (VL22). Additionally, the third solenoid valve (VL30) can supply ammonia gas from the second ammonia gas-liquid separation tank (520) through the second outlet valve (VL21) which is in an open state to the first ammonia nozzle (310) through the first inlet valve (VL12).
[0076] For example, the first gas-liquid separation tank (510) can receive liquid ammonia from the second fuel storage tank (6) through the pipe (P2) and the electronic valve (VL2) under the control of the controller (800), and the second gas-liquid separation tank (520) can receive liquid ammonia from the first gas-liquid separation tank (510) through the pipe (P3) and the electronic valve (VL3) under the control of the controller (800).
[0077] The ammonia combustion device (1) described above is divided into first, second, third, and fourth operating modes according to the control of the controller (800) based on the combustion load state of the combustion chamber (10), and combustion can be controlled in a direction that reduces the generation of nitrogen oxides (NOx) and unburned ammonia, and this is further explained with reference to FIGS. 6 to 13.
[0078] Figure 6 is an example diagram of the configuration of a controller.
[0079] Referring to FIG. 6, the controller (800) may include a first driving mode control unit (810), a second driving mode control unit (820), a third driving mode control unit (830), and a fourth driving mode control unit (840).
[0080] The first driving mode control unit (810) can perform the first driving mode (M1) when the detected temperature (Td) is lower than the first reference temperature (Tref1) (e.g., 250°C), and control the main electronic valve (VL1) to an open state so that only the first fuel is injected into the combustion chamber (10) up to, for example, 250°C, and control the first ammonia gas electronic valve (VL10) and the second ammonia gas electronic valve (VL20) to a closed state.
[0081] Accordingly, when the first fuel is injected into the combustion chamber (10) and air is injected into the combustion chamber (10) through the air nozzle (200), and the igniter (20) is operated by the controller (800), the first fuel is ignited and a main flame (11) can be formed inside the combustion chamber (10) using only the first fuel, without ammonia being injected.
[0082] The second operating mode control unit (820) can perform the second operating mode (M2) when the detected temperature (Td) exceeds the first reference temperature (Tref1) (e.g., 250°C) and is below the second reference temperature (Tref2) (e.g., 650°C), and can control the main electronic valve (VL1) and the first ammonia gas electronic valve (VL10) to an open state and control the second ammonia gas electronic valve (VL20) to a closed state so as to inject the first fuel and the first ammonia gas into the combustion chamber (10), for example, from 250°C to 650°C.
[0083] Accordingly, a first ammonia gas (AG1) can be injected inside the combustion chamber (10) to surround the first flame (11) formed by the first fuel, and accordingly, a second flame (12) can be formed around the first flame (11) and close to the first flame (11) so that combustion can be maintained stably. In this case, the ammonia in the first ammonia gas (AG1) can be sufficiently burned by the heat of the first flame (11) so that the emission of unburned ammonia can be reduced. For example, in the second operating mode (M2), the first ammonia gas (AG1) can be generated in the first ammonia gas-liquid separation tank (510) by the heater (30), and the first ammonia gas (AG1) can be supplied to the first ammonia nozzle (310) through the first ammonia gas electronic valve (VL10) and then injected into the combustion chamber (10).
[0084] The third operating mode control unit (830) can control the main electronic valve (VL1), the first ammonia gas electronic valve (VL10), and the second ammonia gas electronic valve (VL20) to be open so as to inject the first fuel, the first ammonia gas (AG1), and the second ammonia gas electronic valve (VL20) into the combustion chamber (10) when the detected temperature (Td) exceeds the second reference temperature (Tref2) (e.g., 650°C) and is less than or equal to the third reference temperature (Tref3) (e.g., 1000°C).
[0085] Accordingly, a second ammonia gas (AG2) can be injected into the combustion chamber (10) adjacent to the second flame (12) formed by the first ammonia gas (AG1), and accordingly, a third flame (13) can be formed adjacent to the second flame (12), and accordingly, the combustion chamber (10) can be heated evenly, and accordingly, the ammonia can be completely burned so that the emission of unburned ammonia can be minimized.
[0086] And, the fourth operating mode control unit (840) performs the fourth operating mode (M4) when the detected temperature (Td) exceeds the third reference temperature (Tref3) (e.g., 1000℃), and when the combustion chamber (10) is sufficiently heated to exceed 1000℃, the burner can be operated under rated load conditions. In this case, since there is sufficient radiant heat from the flame inside the combustion chamber (10), the first electronic valve (VL10) is controlled to a closed state to cut off the supply of the second ammonia gas, and the main electronic valve (VL1) and the second electronic valve (VL20) are controlled to an open state to inject the first fuel and the second ammonia gas into the combustion chamber (10).
[0087] Accordingly, inside the combustion chamber (10), a first flame (11) from the first fuel and a third flame (13) from the second ammonia gas (AG2) can be formed. Additionally, in the fourth operating mode control unit (840), heat transfer from inside the combustion chamber (10) to the second heat exchanger (521) is sufficient so that all the ammonia required in the second gas-liquid separation tank (520) can be vaporized, and at this time, the ammonia flow rate of the first and second ammonia supply units can be distributed and controlled through real-time combustion exhaust gas component measurement.
[0088] In this way, depending on the composition of the exhaust gas, the first ammonia flame (12) and the second ammonia flame (13) can be formed simultaneously, and by appropriately adjusting the ammonia flow rate distribution, the emission of nitrogen oxides and unburned ammonia can be minimized.
[0089] Meanwhile, the area where the first flame (11) is formed by the first fuel injected by the first fuel injection nozzle (100) may be formed in a horizontal direction away from the end where the first fuel is injected, if the first fuel injection nozzle (100) is installed horizontally on the bottom surface of the combustion chamber (10). In this case, the first ammonia gas or / and the second ammonia gas may be injected in a shape that surrounds the first flame (11). Accordingly, the second flame and the third flame may be formed in a shape that surrounds the first flame (11).
[0090] Additionally, the ammonia gas injection location is located further outward from the location where the first fuel is injected and the location where air is injected, depending on the arrangement of the first and second ammonia nozzles (310, 320), and is located away from the main flame (11) produced by the first fuel, and is an area where a relatively small amount of oxygen concentration is formed, and this area may be an oxygen-deficient area. A flame produced by the first and second ammonia gases may be formed in this oxygen-deficient area, and in this case, the ammonia burns slowly in an area where it is relatively concentrated, thereby suppressing the generation of nitrogen oxides.
[0091] To elaborate, the controller (800) can increase the supply of the first ammonia gas through the first ammonia nozzle (310) when the combustion load in the combustion chamber (10) increases, thereby increasing the intensity of the flame caused by the first ammonia gas, and when the combustion load increases sufficiently, it can reduce the supply of the first ammonia gas through the first ammonia nozzle (310) and increase the supply of the second ammonia gas through the second ammonia nozzle (320) to control the intensity of the flame caused by the second ammonia gas. Accordingly, the intensity of the flame caused by the second ammonia gas is increased, making it possible to operate with reduced harmful substances.
[0092] Next, with reference to FIGS. 7 to 13, an ammonia combustion method will be described. In this disclosure, the description of the ammonia combustion method and the description of the ammonia combustion apparatus may be applied complementarily or commonly to parts that are identically applicable, unless there are mutually exclusive circumstances. Accordingly, redundant descriptions may be omitted. Below, the main process of the ammonia combustion method is described.
[0093] FIG. 7 is a flowchart illustrating an ammonia combustion method according to one embodiment of the present invention.
[0094] Referring to FIGS. 5 and FIGS. 7, an ammonia combustion method according to one embodiment of the invention can be carried out by an ammonia combustion device (1, see FIG. 5).
[0095] The above ammonia combustion method may include a combustion load monitoring step (S100) and an operating mode control step (S200).
[0096] In the combustion load monitoring step (S100), the ammonia combustion device (1, see FIG. 5) can monitor the combustion chamber load condition based on the detected temperature (Td) of the combustion chamber (10).
[0097] In the driving mode control step (S200), the controller (800) of the ammonia combustion device (1, see FIG. 5) determines one of the first, second, third, and fourth driving modes (M1, M2, M3, M4) that are pre-classified according to the combustion chamber load state, and can control the injection amount of the first fuel, the first ammonia gas, and the second ammonia gas according to the determined driving mode.
[0098] Figure 8 is an example diagram of the configuration of the driving mode control step.
[0099] Referring to FIG. 8, the driving mode control step (S200) may include a first driving mode control step (S210), a second driving mode control step (S220), a third driving mode control step (S230), and a fourth driving mode control step (S240).
[0100] In the first driving mode control step (S210), the controller (800) of the ammonia combustion device (1, see FIG. 5) can perform the first driving mode (M1) when the detection temperature (Td) of the combustion chamber (10) is lower than or equal to the first reference temperature (Tref1), and control the main electronic valve (VL1) to inject only the first fuel corresponding to natural gas (LNG), liquefied petroleum gas (LPG), or byproduct gas into the combustion chamber (10) through the fuel injection nozzle (100) to form the first flame (11).
[0101] In the second driving mode control step (S220), the controller (800) of the ammonia combustion device (1, see FIG. 5) can perform the second driving mode (M2) when the detected temperature (Td) exceeds the first reference temperature (Tref1) and is below the second reference temperature (Tref2), and control the main electronic valve (VL1) and the first ammonia gas electronic valve (VL10) to inject the first fuel through the fuel injection nozzle (100) and the first ammonia gas through the first ammonia nozzle (310) into the combustion chamber (10) to form the first flame (11) and the second flame (12).
[0102] In the third driving mode control step (S230), the controller (800) of the ammonia combustion device (1, see FIG. 5) can perform the third driving mode (M3) when the detected temperature (Td) exceeds the second reference temperature (Tref2) and is lower than the third reference temperature (Tref3), and control the main electronic valve (VL1), the first ammonia gas electronic valve (VL10), and the second ammonia gas electronic valve (VL20) to inject the first fuel through the fuel injection nozzle (100), the first ammonia gas through the first ammonia nozzle (310), and the second ammonia gas through the second ammonia nozzle (320) into the combustion chamber (10) to form the flame (11), the second flame (12), and the third flame (13).
[0103] And, in the fourth driving mode control step (S240), the controller (800) of the ammonia combustion device (1, see FIG. 5) can perform the fourth driving mode (M4) when the detected temperature (Td) exceeds the third reference temperature (Tref3), thereby blocking the supply of the first ammonia gas and controlling the main electronic valve (VL1) and the second ammonia gas electronic valve (VL20) to inject the first fuel through the fuel injection nozzle (100) and the second ammonia gas through the second ammonia nozzle (320) into the combustion chamber (10) to form the first flame (11) and the second flame (13).
[0104] FIG. 9 is an explanatory diagram of the operation of the first driving mode stage.
[0105] Referring to FIG. 9, for example, in the first operating mode control step (S210), the controller (800) of the ammonia combustion device (1, see FIG. 5) can perform the first operating mode (M1) if the detected temperature (Td) is lower than or equal to the first reference temperature (Tref1) (e.g., 250°C), thereby controlling the main valve (VL1) to an open state and controlling the first ammonia gas solenoid valve (VL10) and the second ammonia gas solenoid valve (VL20) to a closed state. Accordingly, the first fuel can be injected into the combustion chamber (10) through the fuel injection nozzle (100).
[0106] FIG. 10 is an explanatory diagram of the operation of the second driving mode stage.
[0107] Referring to FIG. 10, in the second operation mode control step (S220), the controller (800) of the ammonia combustion device (1, see FIG. 5) can perform a second operation mode (M2) when the detected temperature (Td) exceeds the first reference temperature (Tref1) (e.g., 250°C) and is below the second reference temperature (Tref2) (e.g., 650°C), and, for example, can control the main solenoid valve (VL1) and the first ammonia gas solenoid valve (VL10) to an open state to inject the first fuel and the first ammonia gas into the combustion chamber (10) from 250°C to 650°C, and at the same time control the heater (30) to an operating state and control the second ammonia gas solenoid valve (VL20) to a closed state.
[0108] That is, when the main flame (11) is formed by the first fuel, the first ammonia gas electronic valve (VL10) is controlled to an open state, thereby controlling the flow rate of the first ammonia gas supplied from the first gas-liquid separation tank (510) to the first ammonia nozzle (310) through the first ammonia gas pipe (P10).
[0109] In this case, a second flame (12) by the first ammonia gas may be additionally formed around the main flame (11) formed in the combustion chamber (10). In this case, by adjusting the opening rate of the first ammonia gas solenoid valve (VL10) installed in the first ammonia gas piping (P10) between the first gas-liquid separation tank (510) and the first ammonia nozzle (310), the flow rate of the first ammonia gas supplied from the first gas-liquid separation tank (510) to the first ammonia nozzle (310) can be controlled.
[0110] FIG. 11 is an explanatory diagram of the operation of the third driving mode stage.
[0111] Referring to FIG. 11, in the third operation mode control step (S230), the controller (800) of the ammonia combustion device (1, see FIG. 5) can perform the third operation mode (M3) when the detected temperature (Td) exceeds the second reference temperature (Tref2) (e.g., 650°C) and is below the third reference temperature (Tref3) (e.g., 1000°C), and control the main solenoid valve (VL1), the first ammonia gas solenoid valve (VL10), and the second ammonia gas solenoid valve (VL20) to an open state so as to inject the first fuel, the first ammonia gas (AG1), and the second ammonia gas (AM2) into the combustion chamber (10), for example, from 650°C to 1000°C.
[0112] That is, in the third driving mode control step (S230), the controller (800) of the ammonia combustion device (1, see FIG. 5) controls the second ammonia gas electronic valve (VL20) to an open state while a flame is formed by the first fuel and the first ammonia gas, thereby controlling the flow rate of the second ammonia gas supplied from the second gas-liquid separation tank (520) to the second ammonia nozzle (320) through the second ammonia gas pipe (P20).
[0113] In this case, in the combustion chamber (10), a third flame (13) by the second ammonia gas may be additionally formed around the second flame (12) by the first ammonia gas formed around the main flame (11).
[0114] For example, by using a second ammonia gas solenoid valve (VL20) installed in a second ammonia gas pipe (P20) connecting the second gas-liquid separation tank (520) and the second ammonia nozzle (320), the opening rate of the second ammonia gas pipe (P20) can be adjusted, thereby controlling the flow rate of the second ammonia gas supplied from the second gas-liquid separation tank (520) to the second ammonia nozzle (320).
[0115] FIG. 12 is an explanatory diagram of the operation of the fourth driving mode stage.
[0116] Referring to FIG. 12, in the fourth operation mode control step (S240), the controller (800) of the ammonia combustion device (1, see FIG. 5) performs the fourth operation mode (M4) when the detected temperature (Td) exceeds the third reference temperature (Tref3) (e.g., 1000°C), and when the combustion chamber (10) is sufficiently heated to exceed 1000°C, the burner can be operated under rated load conditions. In this case, since heat transfer from inside the combustion chamber (10) to the second gas-liquid separation tank (520) is sufficient, the first solenoid valve (VL10) can be controlled to a closed state to cut off the supply of the second ammonia gas, and the main solenoid valve (VL1) and the second solenoid valve (VL20) can be controlled to an open state to inject the first fuel and the second ammonia gas into the combustion chamber (10).
[0117] That is, when a flame is formed by the first fuel, the first ammonia gas, and the second ammonia gas, the first ammonia gas electronic valve (VL10) is controlled to a closed state to stop the heater (30) and block the first ammonia gas supplied from the first gas-liquid separation tank (510) to the first ammonia nozzle (310).
[0118] In this case, a flame formed by the second ammonia gas around the main flame (11) can be formed in the combustion chamber (10). Additionally, if necessary, the third solenoid valve (VL30) can be controlled to an open state so that a second flame (12) and a third flame (13) can be formed by the second ammonia gas around the first flame (11) in the combustion chamber (10).
[0119] For example, by using a second ammonia gas solenoid valve (VL20) installed in a second ammonia gas pipe (P20) connecting the second gas-liquid separation tank (520) and the second ammonia nozzle (320), the opening rate of the second ammonia gas pipe (P20) can be adjusted, thereby controlling the flow rate of the second ammonia gas supplied from the second gas-liquid separation tank (520) to the second ammonia nozzle (320). Additionally, by controlling a third solenoid valve, the distribution control of the second ammonia gas to the first ammonia nozzle (310) and the second ammonia nozzle (320) is possible.
[0120] FIG. 13 is an explanatory diagram of the flow rate control operation for ammonia gas in the third operating mode stage.
[0121] Referring to FIG. 13, in the third driving mode control step (S230), the controller (800) of the ammonia combustion device (1, see FIG. 5) can control the flow rate ratio of the first ammonia gas and the second ammonia gas based on the nitrogen oxide concentration and / or unburned ammonia concentration analyzed by the gas meter (700).
[0122] For example, if the nitrogen oxide concentration measured by the gas meter (700) based on the exhaust gas discharged from the combustion chamber (10) is higher than the reference value, the controller (800) can control the increase in the opening rate of the second ammonia gas solenoid valve (VL20) so that the supply amount of the second ammonia gas increases, and conversely, if the unburned ammonia concentration is higher than the reference value, the controller (800) can control the increase in the opening rate of the first ammonia gas solenoid valve (VL10) so that the supply amount of the first ammonia gas increases.
[0123] Accordingly, the supply flow rates of the first and second ammonia gases can be appropriately distributed and controlled through real-time combustion flue gas component measurement, and by distributing the first and second ammonia flow rates differently in this way, the emission of nitrogen oxides and unburned ammonia can be minimized.
[0124] FIG. 14 is a block diagram of a computing device capable of wholly or partially implementing an ammonia combustion device and method according to one embodiment of the present invention.
[0125] As illustrated in FIG. 14, the computing device (1000) includes at least one processor (1100), a computer-readable storage medium (1200), and a communication bus (1300).
[0126] The processor (1100) can cause the computing device (1000) to operate according to the exemplary embodiment described above. For example, the processor (1100) can execute one or more programs stored in a computer-readable storage medium (1200). The one or more programs may include one or more computer-executable instructions, and the computer-executable instructions may be configured to cause the computing device (1000) to perform operations according to the exemplary embodiment when executed by the processor (1100).
[0127] A computer-readable storage medium (1200) is configured to store computer-executable instructions or program code, program data and / or other suitable forms of information. A program (1210) stored in the computer-readable storage medium (1200) includes a set of instructions executable by a processor (1100). In one embodiment, the computer-readable storage medium (1200) may be memory (volatile memory such as random access memory, non-volatile memory, or a suitable combination thereof), one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other forms of storage media that are accessed by a computing device (1000) and capable of storing desired information, or a suitable combination thereof.
[0128] The communication bus (1300) interconnects various other components of the computing device (1000), including the processor (1100) and the computer-readable storage medium (1200).
[0129] The computing device (1000) may also include one or more input / output interfaces (1500) and one or more network communication interfaces (1600) that provide interfaces for one or more input / output devices (1400). The input / output interfaces (1500) and network communication interfaces (1600) are connected to a communication bus (1300). The network may be any one of a cellular network, such as GSM (Global System for Mobile Communications), EDGE (Enhanced Data Rates for GSM Evolution), GPRS (General Packet Radio Service), CDMA (Code Division Multiple Access), Time Division-CDMA (TD-CDMA), UMTS (Universal Mobile Telecommunications System), LTE (Long Term Evolution), or other cellular networks.
[0130] An input / output device (1400) may be connected to other components of a computing device (1000) through an input / output interface (1500). An exemplary input / output device (1400) may include input devices such as a pointing device (such as a mouse or trackpad), a keyboard, a touch input device (such as a touchpad or touchscreen), a voice or sound input device, various types of sensor devices and / or imaging devices, and / or output devices such as a display device, a printer, a speaker and / or a network card. An exemplary input / output device (1400) may be included inside the computing device (1000) as a component constituting the computing device (1000), or it may be connected to the computing device (1000) as a separate device distinct from the computing device (1000).
[0131] Although representative embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.
[0132] (Explanation of symbols)
[0133] 10: Combustion furnace
[0134] 20: Ignition device
[0135] 30: Heater
[0136] 100: Fuel injection nozzle
[0137] 200: Air nozzle
[0138] 300; ammonia nozzle
[0139] 400: Ammonia gas-liquid separation tank
[0140] 500: Temperature gauge
[0141] 510: First heat exchanger
[0142] 521: Second heat exchanger
[0143] 600: Gas analyzer
[0144] 700: Controller
[0145] 310: 1st ammonia nozzle
[0146] 320: Second ammonia nozzle
[0147] 410: 1st gas-liquid separation tank
[0148] 420: Second gas-liquid separation tank
[0149] P10: 1st Pipeline
[0150] VL10: 1st ammonia gas solenoid valve
[0151] P20: 2nd Piping
[0152] VL20: Second ammonia gas solenoid valve
[0153] VL30: Third solenoid valve
Claims
1. A fuel injection nozzle configured to inject the supplied first fuel into the combustion chamber; An igniter disposed on an outer portion of the fuel injection nozzle and igniting a first fuel injected into the combustion chamber to form a first flame; An air nozzle positioned on the outside of the fuel injection nozzle and configured to inject combustion air into the first flame; An ammonia nozzle positioned on the outer side of the air nozzle and configured to spray supplied ammonia gas around the first flame; An ammonia gas-liquid separation tank configured to be connected to the ammonia nozzle, store liquid ammonia stored internally, vaporize the liquid ammonia into ammonia gas by thermal energy from the flame, and supply the ammonia gas to the ammonia nozzle; and A controller that controls the injection amount of the first fuel and the ammonia gas in one of a plurality of pre-classified operating modes according to the load condition of the combustion chamber; Ammonia combustion device.
2. In Paragraph 1, A temperature measuring instrument that detects the internal temperature of the combustion furnace and provides the detected temperature; further comprising The controller determines the combustion chamber load state based on the detected temperature and determines one of a plurality of first, second, third, and fourth operating modes that are pre-classified according to the combustion chamber load state. Ammonia combustion device.
3. In Paragraph 1, A gas meter for measuring nitrogen oxide concentration and / or unburned ammonia concentration based on flue gas discharged from the combustion furnace; further comprising The above controller Controlling the injection amount of the first fuel and the ammonia gas based on the above nitrogen oxide concentration and / or unburned ammonia concentration Ammonia combustion device.
4. In paragraph 2, the ammonia nozzle A first ammonia nozzle disposed on the outer side of the air nozzle and configured to receive the ammonia gas and inject the first ammonia gas to form a second flame around the first flame; and A second ammonia nozzle disposed on the outer side of the first ammonia nozzle and configured to receive the ammonia gas and inject a second ammonia gas to form a third flame adjacent to the second flame; comprising Ammonia combustion device.
5. In paragraph 4, the ammonia gas-liquid separation tank is, At least a first gas-liquid separation tank configured to include a first heat exchanger connected to the first ammonia nozzle and transferring heat from a heater into the interior, and to vaporize the stored first liquid ammonia into a first ammonia gas by the heat from the first heat exchanger; and A second gas-liquid separation tank comprising: at least a second heat exchanger connected to the second ammonia nozzle and transferring thermal energy from the flame formed in the combustion furnace into the interior, and configured to vaporize the second liquid ammonia into the second ammonia gas by the heat from the second heat exchanger; Ammonia combustion device.
6. In Paragraph 5, A main electronic valve disposed in the first pipe of the first fuel to regulate the supply amount of the first fuel; A first ammonia gas solenoid valve installed in a first ammonia gas piping connecting the first gas-liquid separation tank and the first ammonia nozzle, wherein the opening rate is adjusted according to a control signal, and comprising a first outlet valve installed on the outlet side of the first gas-liquid separation tank and a first inlet valve installed on the inlet side of the first ammonia nozzle; and A second ammonia gas solenoid valve installed in a second ammonia gas piping connecting the second gas-liquid separation tank and the second ammonia nozzle, wherein the opening rate is adjusted according to a control signal, and comprising a second outlet valve installed on the outlet side of the second gas-liquid separation tank and a second inlet valve installed on the inlet side of the second ammonia nozzle; comprising Ammonia combustion device.
7. In Paragraph 6, A third solenoid valve installed in a third ammonia gas pipe connecting the first ammonia gas pipe and the second ammonia gas pipe, wherein the opening rate is adjusted according to a control signal; further comprising Ammonia combustion device.
8. In paragraph 6, the above controller A first operating mode control unit that controls a main electronic valve to inject only the first fuel into the combustion chamber by performing a first operating mode when the detected temperature is below a first reference temperature; A second operating mode control unit that controls the main electronic valve and the first ammonia gas electronic valve to inject the first fuel and the first ammonia gas into the combustion chamber by performing a second operating mode when the detected temperature exceeds the first reference temperature and is below the second reference temperature; A third operating mode control unit that controls the main electronic valve, the first ammonia gas electronic valve, and the second ammonia gas electronic valve to inject the first fuel, the first ammonia gas, and the second ammonia gas into the combustion chamber by performing a third operating mode when the detected temperature exceeds the second reference temperature and is below the third reference temperature; and A fourth operating mode control unit that controls the main solenoid valve and the second ammonia gas solenoid valve to cut off the supply of the first ammonia gas and inject the first fuel and the second ammonia gas into the combustion chamber when the detected temperature exceeds the third reference temperature, thereby performing a fourth operating mode; Ammonia combustion device.
9. A method for ammonia combustion comprising: a fuel injection nozzle for injecting a first fuel into a combustion chamber; an igniter disposed on an outer portion of the fuel injection nozzle; an air nozzle disposed on the outer side of the fuel injection nozzle; a first ammonia nozzle disposed on the outer side of the air nozzle; a second ammonia nozzle disposed on the outer side of the first ammonia nozzle; a first gas-liquid separation tank for supplying a first ammonia gas to at least the first ammonia nozzle; and a second gas-liquid separation tank for supplying a second ammonia gas to at least the second ammonia nozzle. A combustion load monitoring step for monitoring the combustion chamber load state based on the detected temperature of the combustion chamber; and An operating mode control step comprising: determining one of a plurality of pre-classified operating modes according to the combustion chamber load state, and controlling the injection amounts of the first fuel, the first ammonia gas, and the second ammonia gas according to the determined operating mode. Ammonia combustion method.
10. In claim 9, the above-mentioned driving mode control step is, A first operation mode control step in which, if the detected temperature of the combustion chamber is below a first reference temperature, a first operation mode is performed to form a first flame by controlling the main electronic valve to inject only the first fuel into the combustion chamber through the fuel injection nozzle; A second operating mode control step in which, if the detected temperature exceeds a first reference temperature and is lower than or equal to a second reference temperature, a second operating mode is performed to control the main electronic valve and the first ammonia gas electronic valve to inject a first fuel through the fuel injection nozzle and a first ammonia gas through the first ammonia nozzle into the combustion chamber, thereby forming the first flame and the second flame; A third operation mode control step in which, if the detected temperature exceeds a second reference temperature and is lower than or equal to a third reference temperature, a third operation mode is performed to inject a first fuel through the fuel injection nozzle, a first ammonia gas through the first ammonia nozzle, and a second ammonia gas through the second ammonia nozzle into the combustion chamber, thereby controlling the main electronic valve, the first ammonia gas electronic valve, and the second ammonia gas electronic valve to form the flame, the second flame, and the third flame; and A fourth operating mode control step comprising: when the detected temperature exceeds a third reference temperature, performing a fourth operating mode to cut off the supply of the first ammonia gas, and controlling the main electronic valve and the second ammonia gas electronic valve to inject the first fuel through the fuel injection nozzle and the second ammonia gas through the second ammonia nozzle into the combustion chamber to form the first flame and the third flame; Ammonia combustion method.
11. In Clause 10, the third driving mode control step is, A controller controls the flow rate ratio of the first ammonia gas and the second ammonia gas based on the nitrogen oxide concentration and / or unburned ammonia concentration analyzed by a gas meter. Ammonia combustion method.