Liquid ammonia heat treatment device

Abstract

The utility model relates to the technical field of liquid ammonia application, in particular to a liquid ammonia heat treatment device. The liquid ammonia heat treatment device comprises an evaporator, a heat exchange mechanism, a connecting pipe fitting and a flow controller, the air inlet end of the evaporator is communicated with a liquid ammonia tank used for storing liquid ammonia, and the air outlet end of the evaporator is communicated with one end of the connecting pipe fitting. And the other end of the connecting pipe fitting is communicated with the air inlet end of the flow controller. The liquid ammonia in the liquid ammonia tank can be completely gasified basically through the arranged evaporator, when the environment temperature is low and part of the liquid ammonia is not gasified, the liquid ammonia can exchange heat with the liquid ammonia flowing through the connecting pipe fitting through the connecting pipe fitting and the heat exchange mechanism arranged on the connecting pipe fitting, so that the remaining liquid ammonia is completely gasified, and the liquid ammonia is completely gasified. Therefore, no redundant liquid ammonia enters the flow controller along the pipeline, the probability of failure and damage of the flow controller is reduced, and production is not delayed.

Description

Technical Field

[0001] This utility model relates to the field of liquid ammonia application technology, specifically to a liquid ammonia heat treatment device. Background Technology

[0002] The workpiece is placed in a muffle furnace. Ammonia gas is introduced into the muffle furnace, allowing the active nitrogen atoms decomposed from the ammonia gas to penetrate into the metal surface, forming a nitrided layer with high hardness and strong corrosion resistance. However, since gaseous ammonia is not convenient to store and transport, liquid ammonia and an evaporator are usually purchased to vaporize the liquid ammonia into gaseous ammonia before introducing it into the muffle furnace.

[0003] Traditional liquid ammonia heat treatment equipment includes a liquid ammonia tank, an evaporator, a flow controller, and a muffle furnace connected in sequence by pipelines. Liquid ammonia is converted into gaseous ammonia by the evaporator and then enters the muffle furnace for application through the flow controller.

[0004] However, due to the influence of ambient temperature on the evaporator, some liquid ammonia may not be vaporized in cold weather. The liquid ammonia may then enter the flow controller through the pipeline, which can easily cause the flow controller to malfunction and be damaged, delaying production and resulting in low production efficiency. Utility Model Content

[0005] (I) The problem to be solved by this utility model is: how to fully vaporize liquid ammonia and reduce the situation where liquid ammonia flows into the flow controller and causes it to malfunction and damage, thus delaying production.

[0006] (II) Technical Solution

[0007] This utility model provides a liquid ammonia heat treatment device, including an evaporator, a heat exchange mechanism, connecting pipes and a flow controller;

[0008] The evaporator's inlet is connected to a liquid ammonia tank for storing liquid ammonia, and its outlet is connected to one end of the connecting pipe, while the other end of the connecting pipe is connected to the inlet of the flow controller.

[0009] The connecting pipe is provided with a heat exchange mechanism for exchanging heat with the liquid ammonia inside the connecting pipe.

[0010] According to one embodiment of the present invention, the liquid ammonia heat treatment device further includes a muffle furnace, and the heat exchange mechanism includes a heat exchange cylinder and a waste gas combustion assembly;

[0011] The inlet of the muffle furnace is connected to the outlet of the flow controller, and the outlet is equipped with the exhaust gas combustion assembly, which is used to burn the exhaust gas discharged from the muffle furnace.

[0012] The heat exchange cylinder has a heat exchange chamber, a first air inlet and a first air outlet connected together. The heat exchange chamber is used to collect the exhaust gas after combustion, and the connecting pipe is located inside the heat exchange chamber.

[0013] According to one embodiment of the present invention, the connecting pipe is a coil.

[0014] According to one embodiment of the present invention, the exhaust gas combustion assembly includes an exhaust pipe, a combustion cylinder, and an ignition component;

[0015] The combustion chamber has a connected guide cavity and a second gas outlet;

[0016] The two ends of the exhaust pipe are respectively connected to the guide cavity and the gas outlet of the muffle furnace;

[0017] The first air inlet and the second air outlet are positioned opposite to each other;

[0018] The ignition component is disposed on one side of the combustion cylinder and is used to burn the exhaust gas discharged from the combustion cylinder.

[0019] According to one embodiment of the present invention, the combustion cylinder includes an outer cylinder and an inner cylinder sleeved inside the outer cylinder;

[0020] The inner diameter of the outer cylinder is larger than the outer diameter of the inner cylinder;

[0021] The outer cylinder has a first opening, and the inner cylinder has a second opening. The direction of the first opening is opposite to that of the second opening. The bottom wall of the inner cylinder is connected to the first opening by a fastener.

[0022] The exhaust pipe is connected to the end of the outer cylinder away from the first opening.

[0023] According to one embodiment of the present invention, an air pipe is provided on one side of the outer cylinder.

[0024] According to one embodiment of the present invention, the ignition component includes an igniter, a protective cover, and a natural gas pipe;

[0025] The protective cover is fixed to one side of the outer cylinder by a connector;

[0026] One end of the natural gas pipe is connected inside the protective cover, and the igniter is used to ignite the natural gas inside the protective cover.

[0027] According to one embodiment of the present invention, the ignition component further includes a detection head, one end of which protrudes from the protective cover, and the detection head is used to detect whether there is a flame at the opening of the protective cover.

[0028] According to one embodiment of the present invention, a one-way valve is provided on the natural gas pipeline.

[0029] According to one embodiment of the present invention, the top end of the outer cylinder is provided with an annular tube, the annular tube is connected to the air pipeline, and the annular tube is provided with a plurality of through holes, which are distributed around the axial direction of the annular tube.

[0030] The beneficial effects of this utility model are:

[0031] The evaporator can vaporize almost all the liquid ammonia in the tank. When the ambient temperature is low and some liquid ammonia is not vaporized, the liquid ammonia passes through the connecting pipe fittings. The heat exchange mechanism on the connecting pipe fittings can exchange heat with the liquid ammonia flowing through the connecting pipe fittings, so that the remaining liquid ammonia is completely vaporized. As a result, no excess liquid ammonia will enter the flow controller through the pipeline, reducing the probability of the flow controller malfunctioning and damaging itself, and ensuring that production is not delayed. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A front view of the liquid ammonia heat treatment apparatus provided in an embodiment of this utility model;

[0034] Figure 2 A cross-sectional view of the liquid ammonia heat treatment apparatus provided in an embodiment of this utility model;

[0035] Figure 3 Provided for the embodiments of this utility model Figure 2 Enlarged view of section A.

[0036] Icons: 1. Evaporator; 2. Liquid ammonia tank; 3. Connecting pipe fittings; 4. Flow controller; 5. Muffle furnace; 6. Heat exchanger; 7. Exhaust pipe; 8. Combustion cylinder; 801. Outer cylinder; 802. Inner cylinder; 9. Ignition component; 901. Ignition device; 902. Protective cover; 903. Natural gas pipe; 904. Detection head; 905. Check valve; 10. Loop pipe; 11. Air pipeline. Detailed Implementation

[0037] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] like Figures 1-3 As shown, one embodiment of this utility model provides a liquid ammonia heat treatment device, including an evaporator 1, a heat exchange mechanism, a connecting pipe 3, and a flow controller 4;

[0039] The inlet of the evaporator 1 is connected to a liquid ammonia tank 2 for storing liquid ammonia, and its outlet is connected to one end of a connecting pipe 3. The other end of the connecting pipe 3 is connected to the inlet of the flow controller 4.

[0040] The connecting pipe 3 is equipped with a heat exchange mechanism for exchanging heat with the liquid ammonia inside the connecting pipe 3.

[0041] The evaporator 1 can vaporize almost all the liquid ammonia in the liquid ammonia tank 2. When the ambient temperature is low, some liquid ammonia will not be vaporized. The liquid ammonia will pass through the connecting pipe 3. The heat exchange mechanism on the connecting pipe 3 can exchange heat with the liquid ammonia flowing through the connecting pipe 3, so that the remaining liquid ammonia will be vaporized. As a result, no excess liquid ammonia will enter the flow controller 4 through the pipeline, reducing the probability of the flow controller 4 malfunctioning and damaging, and ensuring that production is not delayed.

[0042] Flow controller 4 can be an MFC flow controller.

[0043] According to one embodiment of the present invention, the liquid ammonia heat treatment device further includes a muffle furnace 5, and the heat exchange mechanism includes a heat exchange cylinder 6 and a waste gas combustion assembly.

[0044] The inlet of the muffle furnace 5 is connected to the outlet of the flow controller 4. The outlet is equipped with a waste gas combustion assembly, which is used to burn the waste gas discharged from the muffle furnace 5.

[0045] The heat exchange cylinder 6 has a heat exchange chamber, a first air inlet and a first air outlet connected together. The heat exchange chamber is used to collect the exhaust gas after combustion, and the connecting pipe 3 is located inside the heat exchange chamber.

[0046] The exhaust gas combustion assembly installed at the outlet of the muffle furnace 5 can burn the exhaust gas discharged from the muffle furnace 5, preventing environmental pollution. The heat exchange cylinder 6 collects the combusted exhaust gas, which then exchanges heat with the liquid ammonia in the connecting pipe 3 within the heat exchange cylinder 6. This causes the unvaporized liquid ammonia in the connecting pipe 3 to absorb heat and vaporize, reducing the possibility of flow controller 4 malfunction and ensuring uninterrupted production, thus improving production efficiency. The exhaust gas after heat exchange is discharged through the first outlet.

[0047] After the exhaust gas from the muffle furnace 5 is burned, it is collected in the heat exchanger 6 and heat-exchanged with the gas-liquid mixed ammonia in the connecting pipe 3, causing the liquid ammonia to vaporize. This achieves heat recovery and reuse, completely vaporizing the liquid ammonia and solving the problem of liquid ammonia entering the flow controller 4 due to seasonal influences, regional differences in ambient temperature, or insufficient evaporator capacity purchased by customers. This effectively ensures equipment stability and guarantees the stability of the atmosphere entering the furnace during product processing, reducing costs.

[0048] According to one embodiment of the present invention, the connecting pipe 3 is a coil. One end of the coil passes through the side wall of the heat exchange cylinder 6 and is connected to the outlet of the evaporator 1 through a first pipe. The other end of the coil passes through the side wall of the heat exchange cylinder 6 and is connected to the inlet of the flow controller 4 through a second pipe.

[0049] By setting the coil and its length, the temperature of ammonia entering the inlet of flow controller 4 can be effectively controlled. The longer the coil, the higher the temperature of ammonia entering the inlet of flow controller 4.

[0050] It should be noted that the gas-liquid mixed ammonia in the coil has a relatively fast flow rate, and can quickly exchange heat before entering the inlet of the flow controller 4. The ammonia gas has a short contact time with the high-temperature exhaust gas in the heat exchange cylinder 6, which can make the liquid ammonia vaporize while preventing the ammonia gas from decomposing.

[0051] Of course, the connecting pipe fitting 3 can also be equipped with multiple sets of interconnected coils, and its purpose has not deviated from the design concept of this utility model. Therefore, it should fall within the protection scope of this utility model.

[0052] According to one embodiment of the present invention, the exhaust gas combustion assembly includes an exhaust pipe 7, a combustion cylinder 8, and an ignition component 9;

[0053] The combustion chamber 8 has a connected guide cavity and a second air outlet;

[0054] The two ends of the exhaust pipe 7 are connected to the guide cavity and the gas outlet of the muffle furnace 5, respectively.

[0055] The first air inlet and the second air outlet are positioned opposite each other;

[0056] Ignition component 9 is located on one side of combustion cylinder 8 and is used to burn the exhaust gas discharged from combustion cylinder 8.

[0057] The heat exchange cylinder 6 is fixedly connected to the combustion cylinder 8 via a connecting plate. Optionally, the heat exchange cylinder 6 is fixedly connected to a support frame, with the bottom end of the support frame placed on the ground.

[0058] The diameter of the combustion cylinder 8 is larger than that of the exhaust pipe 7. When the exhaust gas in the exhaust pipe 7 enters the combustion cylinder 8 through the combustion cylinder 8, the cross-sectional area becomes larger, thus the exhaust gas flow rate decreases and the contact area of ​​the exhaust gas increases. When the ignition component 9 is ignited, the exhaust gas is burned more completely.

[0059] According to one embodiment of the present invention, such as Figure 3 As shown, the combustion cylinder 8 includes an outer cylinder 801 and an inner cylinder 802 sleeved inside the outer cylinder 801;

[0060] The inner diameter of the outer cylinder 801 is larger than the outer diameter of the inner cylinder 802;

[0061] The outer cylinder 801 has a first opening, and the inner cylinder 802 has a second opening. The directions of the first opening and the second opening are opposite, that is, the inner cylinder 802 is placed upside down inside the outer cylinder 801, and the bottom wall of the inner cylinder 802 is connected to the first opening by a fastener.

[0062] The exhaust pipe 7 is connected to the end of the outer cylinder 801 that is away from the first opening.

[0063] Preferably, the outer cylinder 801 is a straight cylinder. Optionally, the outer cylinder 801 is a conical cylinder, and the cross-sectional area of ​​the conical cylinder near the heat exchange cylinder 6 is larger than the cross-sectional area of ​​the other end.

[0064] The fasteners include a first plate and a second plate. The top wall of the outer cylinder 801 is welded to the first plate, and the bottom wall of the inner cylinder 802 is welded to the second plate. The first plate and the second plate are fixedly connected by bolts. Multiple first and second plates can be provided; preferably, four first plates and four second plates are provided, each corresponding to the other. The ends of the four second plates that are close to each other are welded together, and the other ends of the four second plates are fixed to their corresponding first plates by bolts. It should be noted that the installation position of the first plate does not affect the disassembly and assembly of the inner cylinder 802.

[0065] The four second plates are fixed together to form a cross-shaped plate, and there is a gap between every two second plates, which will not affect the exhaust gas discharge.

[0066] The outer diameter of the exhaust pipe 7 is smaller than the inner diameter of the inner cylinder 802. A water outlet is provided on the bottom wall of the outer cylinder 801, and a valve is provided on the water outlet. Preferably, the bottom of the outer cylinder 801 is inclined, and the bottom wall of the outer cylinder 801 is lower closer to the water outlet. Opening the valve facilitates the discharge of liquid, thereby improving the effect when burning exhaust gas.

[0067] It should be noted that the inner cylinder 802 is placed upside down inside the outer cylinder 801, and there is a gap between the second opening of the inner cylinder 802 and the outer cylinder 801. The end of the exhaust pipe 7 is located inside the inner cylinder 802 and is suspended in the air. The side wall of the exhaust pipe 7 is connected and fixed to the outer cylinder 801. The exhaust pipe 7 is a rigid pipe.

[0068] The exhaust gas is guided by a flow-guiding cavity, separating the gas and liquid, while increasing the contact area between the exhaust gas and the flame. Specifically, after the exhaust gas in the exhaust pipe 7 is discharged from the port of the exhaust pipe 7, it contacts the bottom wall of the inner cylinder 802 and changes its flow direction. It then flows downward from the gap between the inner cylinder 802 and the exhaust pipe 7 to the bottom wall of the outer cylinder 801. At this time, the liquid in the exhaust gas that appears due to condensation can accumulate on the bottom wall of the outer cylinder 801. When the outlet valve is opened, the liquid can be discharged from the outlet at the bottom of the outer cylinder 801. The gas contacts the bottom wall of the outer cylinder 801 and changes its flow direction again, flowing upward and being discharged from the second outlet for combustion. Most of the exhaust gas after combustion can be collected in the heat exchange cylinder 6.

[0069] It should be noted that the bottom wall of the inner cylinder 802 is located at the first opening, and the gap between the bottom of the inner cylinder 802 and the first opening forms the second air outlet.

[0070] According to one embodiment of the present invention, an air pipe 11 for supplying air is provided on one side of the outer cylinder 801, and an annular pipe 10 is connected to the top of the outer cylinder 801, and the annular pipe 10 is connected to the air pipe 11.

[0071] According to one embodiment of the present invention, the annular pipe 10 has multiple through holes distributed around the axial direction of the annular pipe 10. All the through holes face the second air outlet of the combustion chamber 8.

[0072] Through the multiple through holes opened on the air pipe 11 and the ring pipe 10, air can be supplied to the first opening of the outer cylinder 801 (i.e. the second air outlet of the combustion cylinder 8) to aid in the combustion of exhaust gas.

[0073] According to one embodiment of the present invention, the ignition component 9 includes an igniter 901, a protective cover 902, and a natural gas pipe 903;

[0074] The protective cover 902 is fixed to one side of the outer cylinder 801 via a connector;

[0075] One end of the natural gas pipe 903 is connected inside the protective cover 902, and the igniter 901 is used to ignite the natural gas inside the protective cover 902.

[0076] The ignition end of the igniter 901 is located inside the protective cover 902.

[0077] According to one embodiment of the present invention, the ignition component 9 further includes a detection head 904, one end of which protrudes from the protective cover 902. The detection head 904 is used to detect whether there is a flame at the opening of the protective cover 902.

[0078] The connector includes a connecting rod, one end of which is connected to the side wall of the outer cylinder 801, and the other end of which is fixed to the bottom wall of the protective cover 902. The side wall of the protective cover 902 has multiple holes.

[0079] The protective cover 902 can concentrate the ignited flame, allowing the flame to come into rapid contact with the exhaust gas and ignite it. While the natural gas pipe 903 is still supplying natural gas into the protective cover 902, the liquid ammonia heat treatment device also includes a controller and an alarm bell. When the detection head 904 does not detect the flame, the detection head 904 transmits a signal to the controller, which then controls the alarm bell electrically connected to it to sound an alarm.

[0080] The protective cover 902 is angled, with its opening facing the top of the combustion cylinder 8. It should be noted that there is a gap between the combustion cylinder 8 and the heat exchange cylinder 6. Preferably, the gap between the combustion cylinder 8 and the heat exchange cylinder 6 is between 2 cm and 50 cm, which neither affects the igniter 901's ignition of the exhaust gas inside the combustion cylinder 8 nor hinders the effective collection of exhaust gas heat. Preferably, the diameter of the first air inlet of the heat exchange cylinder 6 is larger than the diameter of the first opening of the outer cylinder 801. This results in better collection of the combusted exhaust gas, and consequently, better heat exchange.

[0081] According to one embodiment of this utility model, a one-way valve 905 is provided on the natural gas pipeline 903. The one-way valve 905 on the natural gas pipeline 903 improves safety. Similarly, a one-way valve 905 is also installed on the air pipeline 11. Preferably, a connecting pipeline can be installed between the air pipeline 11 and the natural gas pipeline 903, and a one-way valve 905 can be provided on the connecting pipeline, allowing the natural gas in the natural gas pipeline 903 to flow into the air pipeline 11 through the connecting pipeline to assist in exhaust gas combustion.

[0082] Specifically, the liquid ammonia in the liquid ammonia tank 2 is vaporized by the action of the evaporator 1. The vaporized ammonia gas is then fed into the muffle furnace 5 through the coil and the flow controller 4. The exhaust gas generated in the muffle furnace 5 is discharged to the exhaust pipe 7 through its outlet, and then enters the combustion cylinder 8 through the exhaust pipe 7. It is discharged from the second outlet of the combustion cylinder 8. The one-way valve 905 on the natural gas pipe 903 and the one-way valve 905 on the air pipe 11 are opened, and the exhaust gas is ignited with the igniter 901. The exhaust gas after combustion enters the heat exchange cylinder 6 and is discharged from the first outlet of the heat exchange cylinder 6.

[0083] When the ambient temperature decreases, the evaporator 1 fails to completely vaporize the liquid ammonia. As a result, some of the unvaporized liquid ammonia is transported with the ammonia gas. The unvaporized liquid ammonia exchanges heat with the high-temperature exhaust gas after combustion in the coil and heat exchange cylinder 6, thereby vaporizing the unvaporized liquid ammonia and reducing the possibility of liquid ammonia flowing through the flow controller 4 and causing it to be damaged.

[0084] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0085] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0086] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A liquid ammonia heat treatment apparatus, characterized in that, It includes an evaporator (1), a heat exchange mechanism, connecting pipe fittings (3), and a flow controller (4); The inlet of the evaporator (1) is connected to a liquid ammonia tank (2) for storing liquid ammonia, and its outlet is connected to one end of the connecting pipe (3). The other end of the connecting pipe (3) is connected to the inlet of the flow controller (4). The connecting pipe (3) is provided with a heat exchange mechanism for exchanging heat with the liquid ammonia inside the connecting pipe (3).

2. The liquid ammonia heat treatment apparatus according to claim 1, characterized in that, The liquid ammonia heat treatment device also includes a muffle furnace (5), and the heat exchange mechanism includes a heat exchange cylinder (6) and a waste gas combustion assembly; The inlet of the muffle furnace (5) is connected to the outlet of the flow controller (4), and the outlet is provided with the exhaust gas combustion assembly, which is used to burn the exhaust gas discharged from the muffle furnace (5). The heat exchange cylinder (6) has a heat exchange chamber, a first air inlet and a first air outlet connected together. The heat exchange chamber is used to collect the exhaust gas after combustion. The connecting pipe (3) is located inside the heat exchange chamber.

3. The liquid ammonia heat treatment apparatus according to claim 1, characterized in that, The connecting fitting (3) is a coil.

4. The liquid ammonia heat treatment apparatus according to claim 2, characterized in that, The exhaust gas combustion assembly includes an exhaust pipe (7), a combustion cylinder (8), and an ignition component (9); The combustion cylinder (8) has a connected guide cavity and a second air outlet; The two ends of the exhaust pipe (7) are respectively connected to the guide cavity and the gas outlet of the muffle furnace (5); The first air inlet and the second air outlet are positioned opposite to each other; The ignition component (9) is disposed on one side of the combustion cylinder (8) and is used to burn the exhaust gas discharged from the combustion cylinder (8).

5. The liquid ammonia heat treatment apparatus according to claim 4, characterized in that, The combustion cylinder (8) includes an outer cylinder (801) and an inner cylinder (802) sleeved inside the outer cylinder (801); The inner diameter of the outer cylinder (801) is larger than the outer diameter of the inner cylinder (802); The outer cylinder (801) has a first opening, and the inner cylinder (802) has a second opening. The direction of the first opening is opposite to that of the second opening. The bottom wall of the inner cylinder (802) is connected to the first opening by a fastener. The exhaust pipe (7) is connected to the end of the outer cylinder (801) away from the first opening.

6. The liquid ammonia heat treatment apparatus according to claim 5, characterized in that, An air duct (11) is provided on one side of the outer cylinder (801).

7. The liquid ammonia heat treatment apparatus according to claim 5, characterized in that, The ignition component (9) includes an igniter (901), a protective cover (902), and a natural gas pipe (903); The protective cover (902) is fixed to one side of the outer cylinder (801) by a connector; One end of the natural gas pipe (903) is connected inside the protective cover (902), and the igniter (901) is used to ignite the natural gas inside the protective cover (902).

8. The liquid ammonia heat treatment apparatus according to claim 7, characterized in that, The ignition component (9) also includes a detection head (904), one end of which protrudes from the protective cover (902). The detection head (904) is used to detect whether there is a flame at the opening of the protective cover (902).

9. The liquid ammonia heat treatment apparatus according to claim 7, characterized in that, A one-way valve (905) is provided on the natural gas pipeline (903).

10. A liquid ammonia heat treatment apparatus according to claim 6, characterized in that, The top end of the outer cylinder (801) is provided with a ring pipe (10), which is connected to the air pipe (11). The ring pipe (10) has multiple through holes, which are distributed around the axis of the ring pipe (10).

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