Pure ammonia fuel supply system for industrial boiler

Abstract

The utility model relates to the technical field of ammonia energy utilization, in particular to a pure ammonia fuel supply system for an industrial boiler. The pure ammonia fuel supply system for the industrial boiler comprises a liquid ammonia temperature adjusting device, a liquid ammonia evaporation device, a plasma ignition burner and a boiler, the liquid ammonia temperature adjusting device is used for providing liquid ammonia subjected to temperature adjustment, the liquid ammonia evaporation device is used for heating and gasifying the liquid ammonia to form ammonia gas, the plasma ignition burner is used for igniting the ammonia gas to form flue gas, and the flue gas enters the boiler for heat exchange. And water in the boiler is subjected to heat exchange to form steam to be output to a steam using end. According to the pure ammonia fuel supply system for the industrial boiler, rapid ignition and stable and continuous combustion of pure ammonia fuel are achieved by arranging the plasma ignition combustor, then the working stability of the industrial boiler using the pure ammonia fuel is improved, meanwhile, due to the fact that the pure ammonia fuel is used, greenhouse gas emission is reduced, and the air quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonia energy utilization, in particular to a pure ammonia fuel supply system for industrial boilers. Background Art

[0002] With the increasing attention paid to environmental protection and energy transformation around the world, the development of efficient, clean and renewable energy utilization methods has become an important research direction in the industrial field. As one of the main sources of energy consumption and emissions, the fuel selection of industrial boilers is of great significance for reducing greenhouse gas emissions and improving air quality.

[0003] The hydrogen storage density of liquid ammonia is significantly higher than that of liquid hydrogen, and it can be used directly as an energy source. However, since ammonia has poor combustion characteristics as an energy fuel, its laminar combustion velocity and calorific value are low, while the energy required for ignition is high, the ignition temperature is high, the explosion limit is narrow, and it is not easy to ignite and burn continuously.

[0004] Therefore, there is an urgent need for a pure ammonia fuel supply system for industrial boilers to achieve rapid ignition and stable and continuous combustion of pure ammonia fuel, and to improve the working stability of industrial boilers when using pure ammonia fuel. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a pure ammonia fuel supply system for industrial boilers, which solves the technical problems that when ammonia fuel is used in industrial boiler working conditions, pure ammonia fuel is difficult to ignite and continue to burn, and greenhouse gas emissions from industrial boilers pollute the environment.

[0007] (II) Technical solution

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0009] The embodiment of the utility model provides a pure ammonia fuel supply system for an industrial boiler, comprising a liquid ammonia temperature regulating device for providing temperature-regulated liquid ammonia, a liquid ammonia evaporation device for heating and gasifying liquid ammonia to form ammonia gas, a plasma ignition burner for igniting ammonia gas to form flue gas, and a boiler for using flue gas to exchange heat with water to form steam; the liquid outlet of the liquid ammonia temperature regulating device is connected to the liquid inlet of the liquid ammonia evaporation device; the gas outlet of the liquid ammonia evaporation device is connected to the gas inlet of the plasma ignition burner; the smoke outlet of the plasma ignition burner is connected to the smoke inlet of the boiler, and the steam outlet of the boiler is used to connect to the steam end.

[0010] Preferably, the plasma ignition burner includes an igniter, an injection box, an ammonia supply unit and a diversion unit, the front side of the injection box forms a combustion zone, the combustion zone is connected to the smoke inlet of the boiler, and the gas outlet of the liquid ammonia evaporation device is respectively connected to the igniter and the ammonia supply unit; the front end of the igniter passes through the injection box and extends to the front side of the injection box, the front end of the igniter forms an ignition zone, and the ignition zone is connected to the combustion zone; the inner cavity of the igniter forms a combustion chamber, and the outlet end of the ammonia supply unit is connected to the inner cavity of the injection box; the diversion unit includes an injection module and a heat recovery channel, the injection module is connected to the front side of the injection box and is connected to the inner cavity of the injection box, the ignition zone can preheat the injection module and ignite the ammonia output by the injection module to the combustion zone, and the ammonia in the combustion zone burns to form flue gas that enters the smoke inlet of the boiler; the heat recovery channel connects the inner cavity of the injection box and the combustion chamber, so that the ammonia in the inner cavity of the injection box flows back to the combustion chamber and is ignited.

[0011] Preferably, the boiler includes a furnace body and a furnace core arranged in the furnace body; a storage space is provided between the furnace body and the furnace core, and the storage space is used to store water; the combustion zone of the plasma ignition burner is connected to the smoke inlet of the furnace core; a steam channel is provided on the furnace body, the inlet of the steam channel is connected to the storage space, and the outlet of the steam channel is connected to the steam end.

[0012] Preferably, the boiler further comprises a smoke pipe, which is wound around the upper part of the furnace body; the smoke outlet of the furnace is connected to the smoke inlet of the smoke pipe.

[0013] Preferably, the plasma ignition burner is connected to the furnace body via a flange.

[0014] Preferably, the liquid ammonia evaporation device includes an evaporator, a circulating water component and an ammonia pressure-stabilizing tank; the water inlet of the evaporator is connected to the water outlet of the circulating water component, the liquid inlet of the evaporator is connected to the liquid outlet of the liquid ammonia temperature regulating device, the gas outlet of the evaporator is connected to the gas inlet of the ammonia pressure-stabilizing tank, and the gas outlet of the ammonia pressure-stabilizing tank is respectively connected to the igniter and the gas inlet of the ammonia supply unit; the circulating water component is used to exchange heat with the evaporator to vaporize the liquid ammonia in the evaporator to form ammonia gas that enters the ammonia pressure-stabilizing tank.

[0015] Preferably, the circulating water component includes a loop, a circulating water pump and an air conditioner for an industrial boiler; the circulating water pump, the evaporator and the air conditioner for an industrial boiler are arranged in series on the loop, the water outlet of the air conditioner for the industrial boiler is connected to the water inlet of the evaporator, and the water outlet of the evaporator is connected to the water inlet of the air conditioner for the industrial boiler.

[0016] Preferably, the liquid ammonia temperature control device comprises a liquid storage tank containing liquid ammonia and a temperature control room; the liquid storage tank is arranged in the temperature control room, and the liquid outlet of the liquid storage tank is connected to the liquid inlet of the evaporator to provide liquid ammonia for the evaporator.

[0017] Preferably, the liquid ammonia temperature regulating device further comprises a filter; the liquid outlet of the liquid storage tank is connected to the liquid inlet of the evaporator through the filter.

[0018] Preferably, a first valve is provided between the liquid storage tank and the filter; a second valve is provided between the evaporator and the air conditioner for the industrial boiler; a third valve is provided between the ammonia pressure stabilizing tank and the plasma ignition burner; and a fourth valve is provided between the boiler and the steam end.

[0019] (III) Beneficial effects

[0020] The beneficial effects of the utility model are:

[0021] The utility model discloses a pure ammonia fuel supply system for industrial boilers, comprising a liquid ammonia temperature control device, a liquid ammonia evaporation device, a plasma ignition burner and a boiler. The liquid ammonia temperature control device is used to provide temperature-controlled liquid ammonia, the liquid ammonia evaporation device is used to heat and gasify liquid ammonia to form ammonia gas, the plasma ignition burner is used to ignite the ammonia gas to form flue gas that enters the boiler for heat exchange, and the water in the boiler forms steam after heat exchange and is output to the steam-using end. The pure ammonia fuel supply system for industrial boilers realizes the rapid ignition and stable and continuous combustion of pure ammonia fuel by setting a plasma ignition burner, thereby improving the working stability of industrial boilers when using pure ammonia fuel. At the same time, due to the use of pure ammonia fuel, greenhouse gas emissions are reduced and air quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the process of the pure ammonia fuel supply system for industrial boilers of the utility model;

[0023] Figure 2 for Figure 1 A cross-sectional schematic diagram of a plasma ignition burner in FIG.

[0024] Figure 3 This is a schematic diagram of the boiler structure.

[0025] [Description of Reference Numerals]

[0026] 1: Liquid storage tank; 2: Adjusting room; 3: Filter; 4: Evaporator; 5: Ammonia pressure regulating tank; 6: Loop; 7: Circulating water pump; 8: Air conditioner for industrial boiler; 9: Plasma ignition burner; 91: Ignitor; 92: Injection box; 93: Ammonia supply unit; 94: Diversion unit; 941: Injection module; 942: Heat recovery channel; 10: Boiler; 101: Furnace body; 102: Furnace core; 103: Smoke pipe; 11: First valve; 12: Second valve; 13: Third valve; 14: Fourth valve. DETAILED DESCRIPTION

[0027] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0028] like Figure 1As shown, this embodiment provides a pure ammonia fuel supply system for industrial boilers, which includes a liquid ammonia temperature control device, a liquid ammonia evaporation device, a plasma ignition burner 9 and a boiler 10. The liquid outlet of the liquid ammonia temperature control device is connected to the liquid inlet of the liquid ammonia evaporation device, and the gas outlet of the liquid ammonia evaporation device is connected to the gas inlet of the plasma ignition burner 9; the smoke outlet of the plasma ignition burner 9 is connected to the smoke inlet of the boiler 10, and the steam outlet of the boiler 10 is used to connect to the steam end, the liquid ammonia temperature control device is used to provide liquid ammonia after temperature control, the liquid ammonia evaporation device is used to heat and gasify the liquid ammonia to form ammonia gas, and the plasma ignition burner 9 is used to ignite the ammonia gas to form smoke entering the boiler 10 for heat exchange, and the water in the boiler 10 is heat exchanged to form steam output to the steam end.

[0029] The pure ammonia fuel supply system for industrial boilers realizes rapid ignition and stable and continuous combustion of pure ammonia fuel by setting a plasma ignition burner 9, thereby improving the working stability of the industrial boiler 10 when using pure ammonia fuel. At the same time, due to the use of pure ammonia fuel, greenhouse gas emissions are reduced and air quality is improved.

[0030] The liquid ammonia temperature control device comprises a liquid storage tank 1 storing liquid ammonia, a temperature control room 2 and a filter 3. The liquid storage tank 1 is arranged in the temperature control room 2. The liquid outlet of the liquid storage tank 1 is connected with the liquid inlet of the evaporator 4 after filtering impurities through the filter 3 to provide liquid ammonia for the evaporator 4. The temperature control room 2 provides a temperature-adjustable environment of 0°C to 20°C for the liquid storage tank 1, ensures that the liquid ammonia in the liquid storage tank 1 is at a constant temperature, ensures that the system pressure is at a stable value of 0.4 to 0.8 MPa, and improves the reliability of the system.

[0031] The liquid ammonia evaporation device includes an evaporator 4, a circulating water component and an ammonia pressure-stabilizing tank 5. The water inlet of the evaporator 4 is connected to the water outlet of the circulating water component, the liquid inlet of the evaporator 4 is connected to the liquid outlet of the liquid ammonia temperature control device, the gas outlet of the evaporator 4 is connected to the gas inlet of the ammonia pressure-stabilizing tank 5, and the gas outlet of the ammonia pressure-stabilizing tank 5 is respectively connected to the gas inlets of the igniter 91 and the ammonia supply unit 93. The circulating water component is used for heat exchange with the evaporator 4 to vaporize the liquid ammonia in the evaporator 4 to form ammonia gas that enters the ammonia pressure-stabilizing tank 5.

[0032] The circulating water component includes a loop 6, a circulating water pump 7 and an air conditioner 8 for an industrial boiler. The circulating water pump 7, the evaporator 4 and the air conditioner 8 for an industrial boiler are arranged in series on the loop 6. The water outlet of the air conditioner 8 for an industrial boiler is connected to the water inlet of the evaporator 4. The water outlet of the evaporator 4 is connected to the water inlet of the air conditioner 8 for an industrial boiler. The cooling water in the loop 6 is heat-exchanged through the air conditioner 8 for an industrial boiler to form hot water. The hot water passes through the circulating water pump 7 and then enters the evaporator 4 for heat exchange to form cooling water. Liquid ammonia enters the evaporator 4. The evaporator 4 vaporizes the liquid ammonia through heat exchange to form ammonia gas, which enters the ammonia pressure-stabilizing tank 5.

[0033] In this embodiment, cooling water is converted into high-temperature water after heat exchange through the industrial boiler air conditioner 8. The high-temperature water is converted into cooling water after heat exchange through the evaporator 4 and returns to the industrial boiler air conditioner 8 for heat exchange again, thereby making full use of the cooling and heat dissipation losses and improving the overall efficiency and economy of the module.

[0034] like Figure 2 As shown, the plasma ignition burner 9 includes an igniter 91, an injection box 92, an ammonia supply unit 93 and a diversion unit 94. The front side of the injection box 92 forms a combustion zone, which is connected to the smoke inlet of the boiler 10. The gas outlet of the liquid ammonia evaporation device is connected to the igniter 91 and the ammonia supply unit 93 respectively. The front end of the igniter 91 passes through the injection box 92 and extends to the front side of the injection box 92. The front end of the igniter 91 forms an ignition zone, which is connected to the combustion zone. The front end inner cavity of the igniter 91 forms a combustion chamber, the outlet end of the ammonia supply unit 93 is connected to the inner cavity of the injection box 92, the diversion unit 94 includes an injection module 941 and a heat recovery channel 942, the injection module 941 is connected to the front side of the injection box 92 and is connected to the inner cavity of the injection box 92, the ignition zone can preheat the injection module 941 and ignite the ammonia output by the injection module 941 to the combustion zone, the ammonia in the combustion zone burns to form flue gas that enters the smoke inlet of the boiler 10, the heat recovery channel 942 connects the inner cavity of the injection box 92 and the combustion chamber, so that the ammonia in the inner cavity of the injection box 92 flows back to the combustion chamber and is ignited.

[0035] In this embodiment, a combustion chamber is formed inside the igniter 91. This chamber is where the initial combustion of ammonia occurs. The front end of the igniter 91 is designed as an open structure that penetrates the injection box 92, so that the high-temperature flame and heat generated by the plasma ignition can be directly radiated to the preheating zone, which is convenient for heating the ammonia in the injection box 92, and under the flow of the burning mixed gas, an ignition zone can also be formed on the front side of the injection box 92 to ignite the high-temperature ammonia output by the injection module 941. At the same time, the burning mixed gas output by the combustion chamber can also preheat the injection module 941, thereby increasing the temperature of the ammonia output by the injection module 941, which is conducive to ensuring that the ammonia is ignited.

[0036] The injection module 941 and the heat recovery channel 942 divide the ammonia into two output directions. Most of the ammonia is output through the injection module 941 and can be ignited by the igniter 91, and a small part is output to the inside of the igniter 91 through the heat recovery channel 942. Before the igniter 91 stops working, this small part of the ammonia can be ignited and can remain in the combustion chamber for a period of time after ignition. In this way, even if the igniter 91 stops working, the ammonia output by the heat recovery channel 942 can still be ignited.

[0037] The igniter 91 plays an ignition role in the initial stage of combustion. When the ammonia in the injection box 92 can reach the temperature of autonomous combustion, it still maintains self-sustaining combustion after the plasma ignition burner 9 is turned off, thereby ensuring the reliability of the use of the plasma ignition burner 9. The igniter 91 does not need to remain in working condition all the time, thereby reducing the energy consumption of the plasma ignition burner 9.

[0038] like Figure 3 As shown, the boiler 10 includes a furnace body 101, a furnace 102 and a smoke pipe 103. The furnace 102 is arranged in the furnace body 101, and the smoke pipe 103 is wound around the upper part of the furnace body 101. A storage space is provided between the furnace body 101 and the furnace 102, and the storage space is used to store water. The combustion zone of the plasma ignition burner 9 is connected to the smoke inlet of the furnace 102, and the smoke outlet of the furnace 102 is connected to the smoke inlet of the smoke pipe 103. A steam channel is provided on the furnace body 101, and the inlet of the steam channel is connected to the storage space, and the outlet of the steam channel is connected to the steam end. Among them, the plasma ignition burner 9 and the furnace body 101 are connected by a flange.

[0039] In order to facilitate the control of the flow between two adjacent components, a first valve 11 is provided between the liquid storage tank 1 and the filter 3, a second valve 12 is provided between the evaporator 4 and the industrial boiler air conditioner 8, a third valve 13 is provided between the ammonia pressure regulating tank 5 and the plasma ignition burner 9, and a fourth valve 14 is provided between the boiler 10 and the steam end.

[0040] Working principle: The temperature in the conditioning room 2 can be adjusted at 0℃~25℃, and the pressure in the liquid storage tank 1 is maintained at 0.4~1.0MPa. The valve of the liquid storage tank 1 is opened, and the liquid ammonia comes out of the liquid ammonia tank and passes through the filter 3, then opens the first valve 11 and enters the evaporator 4, where it is heated and vaporized by the refrigerant water to form ammonia gas. After the refrigerant water releases heat and cools, the second valve 12 is opened and enters the air conditioner 8 for the industrial boiler, providing a cold source for the refrigeration system. The vaporized ammonia gas enters the ammonia pressure-stabilizing tank 5, opens the third valve 13, enters the plasma ignition burner 9 for combustion, and provides high-temperature flue gas for the industrial boiler 10. After the flue gas enters the furnace 102 and the smoke pipe 103 to heat the water, the water is evaporated into water vapor, and the fourth valve 14 is opened to enter the steam-using end.

[0041] In the description of the utility model, it is necessary to understand that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0045] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A pure ammonia fuel supply system for industrial boilers, characterized in that: It comprises a liquid ammonia temperature regulating device for providing temperature-regulated liquid ammonia, a liquid ammonia evaporating device for heating and gasifying the liquid ammonia to form ammonia gas, a plasma ignition burner (9) for igniting the ammonia gas to form flue gas, and a boiler (10) for using the flue gas to exchange heat with water to form steam; The liquid outlet of the liquid ammonia temperature regulating device is connected to the liquid inlet of the liquid ammonia evaporating device; The gas outlet of the liquid ammonia evaporation device is communicated with the gas inlet of the plasma ignition burner (9); The smoke outlet of the plasma ignition burner (9) is in communication with the smoke inlet of the boiler (10), and the steam outlet of the boiler (10) is used to connect to the steam end.

2. The pure ammonia fuel supply system for industrial boilers according to claim 1, characterized in that: The plasma ignition burner (9) comprises an igniter (91), an injection box (92), an ammonia supply unit (93) and a diversion unit (94); the front side of the injection box (92) forms a combustion zone, the combustion zone is connected to the smoke inlet of the boiler (10), and the gas outlet of the liquid ammonia evaporation device is respectively connected to the igniter (91) and the ammonia supply unit (93); The front end of the igniter (91) passes through the injection box (92) and extends to the front side of the injection box (92), and the front end of the igniter (91) forms an ignition zone, which is connected to the combustion zone; The inner cavity of the igniter (91) forms a combustion cavity, and the outlet end of the ammonia supply unit (93) is connected to the inner cavity of the injection box (92); The diversion unit (94) comprises an injection module (941) and a heat recovery channel (942); the injection module (941) is connected to the front side of the injection box (92) and communicates with the inner cavity of the injection box (92); the ignition zone is capable of preheating the injection module (941) and igniting the ammonia output by the injection module (941) to the combustion zone; the ammonia in the combustion zone burns to form flue gas that enters the smoke inlet of the boiler (10); The heat recovery channel (942) connects the inner cavity of the injection box (92) and the combustion chamber, so that the ammonia gas in the inner cavity of the injection box (92) flows back to the combustion chamber and is ignited.

3. The pure ammonia fuel supply system for industrial boilers according to claim 2, characterized in that: The boiler (10) comprises a furnace body (101) and a furnace core (102) arranged in the furnace body (101); A storage space is provided between the furnace body (101) and the furnace core (102), and the storage space is used to store water; The combustion zone of the plasma ignition burner (9) is in communication with the smoke inlet of the furnace (102); The furnace body (101) is provided with a steam channel, the inlet of the steam channel is communicated with the storage space, and the outlet of the steam channel is communicated with the steam using end.

4. The pure ammonia fuel supply system for industrial boilers according to claim 3, characterized in that: The boiler (10) further comprises a smoke pipe (103), wherein the smoke pipe (103) is wound around the upper part of the furnace body (101); The smoke outlet of the furnace (102) is in communication with the smoke inlet of the smoke pipe (103).

5. The pure ammonia fuel supply system for industrial boilers according to claim 3, characterized in that: The plasma ignition burner (9) and the furnace body (101) are connected via a flange.

6. The pure ammonia fuel supply system for industrial boilers according to claim 2, characterized in that: The liquid ammonia evaporation device comprises an evaporator (4), a circulating water component and an ammonia pressure stabilizing tank (5); The water inlet of the evaporator (4) is communicated with the water outlet of the circulating water component, the liquid inlet of the evaporator (4) is communicated with the liquid outlet of the liquid ammonia temperature regulating device, the gas outlet of the evaporator (4) is communicated with the gas inlet of the ammonia pressure regulating tank (5), and the gas outlet of the ammonia pressure regulating tank (5) is communicated with the gas inlets of the igniter (91) and the ammonia supply unit (93) respectively; The circulating water component is used to exchange heat with the evaporator (4) to vaporize the liquid ammonia in the evaporator (4) to form ammonia gas which enters the ammonia pressure-stabilizing tank (5).

7. The pure ammonia fuel supply system for industrial boilers according to claim 6, characterized in that: The circulating water assembly comprises a loop (6), a circulating water pump (7) and an air conditioner (8) for an industrial boiler; The circulating water pump (7), the evaporator (4) and the industrial boiler air conditioner (8) are arranged in series on the loop (6); the water outlet of the industrial boiler air conditioner (8) is connected to the water inlet of the evaporator (4), and the water outlet of the evaporator (4) is connected to the water inlet of the industrial boiler air conditioner (8).

8. The pure ammonia fuel supply system for industrial boilers according to claim 7, characterized in that: The liquid ammonia temperature control device comprises a liquid storage tank (1) storing liquid ammonia and a temperature control chamber (2); The liquid storage tank (1) is arranged in the temperature-controlled chamber (2); the liquid outlet of the liquid storage tank (1) is connected to the liquid inlet of the evaporator (4) to provide liquid ammonia for the evaporator (4).

9. The pure ammonia fuel supply system for industrial boilers according to claim 8, characterized in that: The liquid ammonia temperature regulating device further comprises a filter (3); The liquid outlet of the liquid storage tank (1) is connected to the liquid inlet of the evaporator (4) through the filter (3).

10. The pure ammonia fuel supply system for industrial boilers according to claim 9, characterized in that: A first valve (11) is provided between the liquid storage tank (1) and the filter (3); A second valve (12) is provided between the evaporator (4) and the industrial boiler air conditioner (8); A third valve (13) is provided between the ammonia pressure stabilizing tank (5) and the plasma ignition burner (9); A fourth valve (14) is provided between the boiler (10) and the steam-using end.

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