Ammonia filling system with pipeline ammonia unloading and water curtain spraying functions

Abstract

The invention discloses an ammonia filling system with pipeline ammonia unloading and water curtain spraying functions. The system comprises a liquid ammonia filling module, a gas ammonia backflow module, a pipeline ammonia unloading module and a water curtain spraying module. The liquid ammonia filling module conveys liquid ammonia through a first filling ball valve, a filter, a liquid ammonia pump, a liquid phase mass flowmeter and a second filling ball valve; the gas ammonia reflux module realizes ammonia gas recovery through a first reflux ball valve, a gas phase mass flowmeter and a second reflux ball valve; the pipeline ammonia unloading module is respectively connected with the ammonia absorption treatment device through a liquid ammonia discharge ball valve and a gas ammonia discharge ball valve and is used for discharging residual ammonia; the water curtain spraying module is arranged above the filling system and used for leakage emergency treatment. According to the ammonia filling system, the independently arranged filling and backflow system is matched with a pipeline ammonia unloading function and water curtain spraying protection, so that the problems of incomplete residual ammonia discharge and leakage risk of a traditional ammonia filling system are effectively solved, and the safety and reliability of the ammonia filling process are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia filling equipment, and in particular to an ammonia filling system comprising pipeline ammonia leakage and water curtain spraying and a control method thereof. Background Art

[0002] Ammonia is an ideal hydrogen carrier because it is carbon-free, has a high hydrogen content (17.6 wt%), high mass energy density (22.5 MJ / kg), and high volume energy density (11.5 MJ / L). It also has a low boiling point and is easily liquefied under pressure at room temperature. Against the backdrop of the booming development of ammonia energy applications, ammonia storage and transportation systems characterized by safety, reliability, continuity, and low energy consumption will usher in new development opportunities, which also puts higher demands on the filling process during ammonia storage and transportation.

[0003] Most existing ammonia filling technologies use a single liquid-phase pipeline with an exhaust valve, which makes it difficult to meet the sealing requirements during the ammonia filling process and lacks the means to deal with ammonia leaks. Due to the characteristics of ammonia, ammonia remaining in the pipeline for a long time may cause pipeline corrosion, and if the ammonia filling system is idle for a long time, problems such as loose interfaces may occur. Due to the certain toxicity of ammonia, if a leak occurs during the filling process, it will lead to serious accidents. Summary of the Invention

[0004] In view of the fact that in the existing ammonia source storage and transportation process, the sealing requirements during the liquid ammonia filling process are difficult to meet and there is a lack of effective means to deal with liquid ammonia leakage; the long-term residence of liquid ammonia causes corrosion to the pipeline and loose interfaces when idle; an ammonia filling system with pipeline ammonia discharge and water curtain spraying is provided, which can, on the basis of ensuring the ammonia filling function, discharge the residual liquid ammonia in the pipeline in time after the filling is completed, and reduce the high pressure in the pipeline caused by the residual liquid ammonia, corrosion and loose interfaces during long-term storage.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an ammonia filling system with pipeline ammonia unloading and water curtain spraying, comprising a liquid ammonia filling module, a gas ammonia reflux module, a pipeline ammonia unloading module and a water curtain spraying module; the two ends of the liquid ammonia filling module are respectively connected to the liquid ammonia storage tank and the ammonia receiving bottle; the liquid ammonia filling module comprises a first filling ball valve, a filter, a liquid ammonia pump, a liquid phase mass flowmeter and a second filling ball valve; the filling ball valve, the filter, the liquid ammonia pump, the liquid phase mass flowmeter and the second filling ball valve are connected in series, the first filling ball valve is connected to the liquid ammonia storage tank, and the second filling ball valve is connected to the ammonia receiving bottle; the two ends of the gas ammonia recovery module are respectively connected to the liquid ammonia storage tank and the ammonia receiving bottle; the gas ammonia recovery module comprises a first reflux ball valve, a gas phase mass flowmeter and a second reflux ball valve; the first reflux ball valve, the gas phase mass flowmeter and the second reflux valve are connected in series; the first reflux ball valve is connected to the ammonia receiving bottle, and the second reflux ball valve is connected to the liquid ammonia storage tank;

[0006] The pipeline ammonia unloading module includes a liquid ammonia discharge ball valve, a gaseous ammonia discharge ball valve and an ammonia absorption treatment device; the liquid ammonia discharge ball valve is connected to the ammonia absorption treatment device; the gaseous ammonia discharge ball valve is connected to the ammonia absorption treatment device; the liquid ammonia discharge ball valve is connected to the gaseous ammonia recovery module, and the gaseous ammonia discharge ball valve is connected to the liquid ammonia filling module; the liquid ammonia discharge ball valve and the gaseous ammonia discharge ball valve are not connected to each other; the water curtain spray module is located above the gaseous ammonia recovery module and the liquid ammonia filling module; the water curtain spray module is used to spray water to the gaseous ammonia recovery module and the liquid ammonia filling module; a control method for an ammonia filling system including pipeline ammonia unloading and water curtain spraying; comprising the following steps: step 1: open the first filling ball valve and the first reflux ball valve; The liquid ammonia in the ammonia storage tank enters the ammonia receiving bottle through the first filling ball valve, filter, liquid ammonia pump liquid phase mass flowmeter, and second filling ball valve; Step 2: The ammonia gas in the ammonia receiving bottle is refluxed to the liquid ammonia storage tank through the first reflux ball valve, gas phase mass flowmeter, and second reflux ball valve; Step 3: Open the gas ammonia discharge ball valve and close the liquid ammonia discharge ball valve; introduce the ammonia gas remaining in the gas ammonia reflux module into the ammonia absorption treatment device through the gas ammonia discharge ball valve; Step 4: Close the gas ammonia discharge ball valve and open the liquid ammonia discharge ball valve; introduce the liquid ammonia remaining in the liquid ammonia filling module into the ammonia absorption treatment device through the liquid ammonia discharge ball valve; after the discharge is completed, close the liquid ammonia discharge ball valve to complete the filling of liquid ammonia.

[0007] Furthermore, a tank liquid phase pipeline connecting flange is provided between the first filling ball valve and the liquid ammonia storage tank, and a receiving bottle liquid phase pipeline connecting flange is provided between the second filling ball valve and the ammonia receiving bottle; the first reflux ball valve and the ammonia receiving bottle are connected via the receiving bottle gas phase pipeline connecting flange; the second reflux ball valve and the liquid ammonia storage tank are connected via the tank gas phase pipeline connecting flange.

[0008] Furthermore, the tank gas phase pipeline connection flange and the tank liquid phase connection flange are separately arranged and connected to different positions of the liquid ammonia storage tank; the receiving bottle gas phase pipeline connection flange and the receiving bottle liquid phase pipeline connection flange are separately arranged and connected to different positions of the ammonia receiving bottle.

[0009] Furthermore, the liquid phase connecting flange of the storage tank and the liquid phase pipeline connecting flange of the receiving bottle are correspondingly connected to the bottom of the liquid ammonia storage tank and the bottom of the ammonia receiving bottle; the gas phase connecting flange of the storage tank and the gas phase pipeline connecting flange of the receiving bottle are correspondingly connected to the top of the liquid ammonia storage tank and the top of the ammonia receiving bottle.

[0010] Furthermore, the first filling ball valve is connected to the filter and the liquid ammonia pump through a first pipeline, and the liquid ammonia pump is connected to the liquid mass flowmeter and the second filling ball valve through a second pipeline; the first pipeline and the second pipeline are connected, the second pipeline is set higher than the first pipeline, and the first reflux ball valve, the gas mass flowmeter and the second reflux ball valve are located on the third pipeline; the third pipeline is located above the second pipeline.

[0011] Furthermore, the liquid ammonia discharge valve is directly connected to the liquid ammonia mass flowmeter, and the gaseous ammonia discharge ball valve is directly connected to the gas phase mass flowmeter; when the liquid ammonia discharge valve is opened, the excess liquid ammonia in the liquid ammonia filling module passes through the liquid ammonia mass flowmeter, then passes through the liquid ammonia discharge valve and then enters the ammonia absorption treatment device for liquid ammonia recovery and storage; when the gaseous ammonia discharge ball valve is opened, the excess ammonia in the gaseous ammonia recovery module passes through the gas phase mass flowmeter, then passes through the gaseous ammonia discharge ball valve and enters the ammonia adsorption treatment device for ammonia recovery and storage.

[0012] Furthermore, the ammonia adsorption treatment device is connected to an ammonia discharge pipeline connecting flange, and the ammonia adsorption treatment device is respectively connected to the liquid ammonia discharge valve and the gaseous ammonia discharge ball valve through the ammonia discharge pipeline connecting flange.

[0013] Furthermore, the water curtain spray module includes an electronic control integrated panel, a high-pressure water tank, an ammonia concentration detector, a spray control ball valve and a water curtain nozzle; the electronic control integrated panel is electrically connected to the ammonia concentration detector, the high-pressure water tank and the spray control ball valve; the high-pressure water tank is connected to the spray control ball valve, and the spray control ball valve is then connected to the water curtain nozzle.

[0014] Furthermore, the electronic control integrated panel is also electrically connected to the first filling ball valve, the second filling ball valve and the liquid ammonia pump in the liquid ammonia filling module; the electronic control integrated panel is also electrically connected to the first reflux ball valve and the second reflux ball valve in the gas ammonia reflux module.

[0015] Furthermore, based on the detection result of the ammonia concentration detector, the electronic control integrated panel controls the spray control ball valve and controls the high-pressure water tank to supply water to the water curtain nozzle, forming a water curtain inside the system.

[0016] The ammonia filling system with pipeline ammonia unloading and water curtain spraying described in the present invention is characterized by separate arrangement of liquid ammonia filling and gaseous ammonia reflux and their synchronous operation, and a pipeline ammonia unloading module is respectively provided on the liquid ammonia filling module and the gaseous ammonia reflux module. On the basis of ensuring the ammonia filling function, on the one hand, the residual ammonia in the pipeline can be discharged in time after the ammonia filling is completed, so as to prevent the presence of high-pressure gaseous ammonia / liquid ammonia in the pipeline when the filling equipment is idle for a long time, and prevent leakage caused by corrosion, loose interfaces and other problems during long-term storage; combined with the water curtain spraying module, ammonia leakage and other problems occurring during the filling process are prevented in time, and a safe ammonia filling solution is provided which can actively unload ammonia and, when necessary, perform certain treatment on ammonia leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention, the following will briefly introduce the drawings required for use in the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a structural schematic diagram of an ammonia filling system comprising pipeline ammonia unloading and water curtain spraying according to the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the ammonia filling system with pipeline ammonia unloading and water curtain spraying according to the present invention includes a liquid ammonia filling module, a gaseous ammonia reflux module, a pipeline ammonia unloading module and a water curtain spraying module;

[0021] The two ends of the liquid ammonia filling module are respectively connected to the liquid ammonia storage tank and the ammonia receiving bottle; the liquid ammonia filling module includes a first filling ball valve 2, a filter 3, a liquid ammonia pump 4, a liquid phase mass flowmeter 5, and a second filling ball valve 6; the filling ball valve 2, the filter 3, the liquid ammonia pump 4, the liquid phase mass flowmeter 5 and the second filling ball valve 6 are connected in series, the first filling ball valve 2 is connected to the liquid ammonia storage tank, and the second filling ball valve 6 is connected to the ammonia receiving bottle;

[0022] The two ends of the gas ammonia recovery module are respectively connected to the liquid ammonia storage tank and the ammonia receiving bottle; the gas ammonia recovery module includes a first reflux ball valve 9, a gas phase mass flow meter 10, and a second reflux ball valve 11; the first reflux ball valve 9, the gas phase mass flow meter 10, and the corresponding second reflux valve 11 are connected in series; the first reflux ball valve 9 is connected to the ammonia receiving bottle, and the second reflux ball valve 11 is connected to the liquid ammonia storage tank;

[0023] The pipeline ammonia unloading module includes a liquid ammonia discharge ball valve 13, a gaseous ammonia discharge ball valve 14 and an ammonia absorption treatment device 23; the liquid ammonia discharge ball valve 13 is connected to the ammonia absorption treatment device 23; the gaseous ammonia discharge ball valve 14 is connected to the ammonia absorption treatment device 23; the liquid ammonia discharge ball valve 13 is connected to the gaseous ammonia recovery module, and the gaseous ammonia discharge ball valve 14 is connected to the liquid ammonia filling module; the liquid ammonia discharge ball valve 13 and the gaseous ammonia discharge ball valve 14 are not connected to each other; the water curtain spray module is located above the gaseous ammonia recovery module and the liquid ammonia filling module; the water curtain spray module is used to spray water to the gaseous ammonia recovery module and the liquid ammonia filling module.

[0024] exist Figure 1In the embodiment, a tank liquid phase pipeline connection flange 1 is provided between the first filling ball valve 2 of the liquid ammonia filling module and the liquid ammonia storage tank; the liquid ammonia storage tank is connected to the first filling ball valve 2 through the storage tank liquid phase pipeline connection flange 1, the first filling ball valve 2 is further connected to the filter 3 and the liquid ammonia pump 4 through a first pipeline, the liquid ammonia pump 4 is further connected to the liquid phase mass flowmeter 5 and the second filling ball valve 6 through a second pipeline, the first pipeline and the second pipeline are in communication, the first pipeline is used to introduce liquid ammonia into the liquid ammonia pump 4, the liquid ammonia pump 4 is further connected through the second pipeline The liquid ammonia is discharged through the pipeline and introduced into the ammonia receiving bottle; the second filling ball valve 6 is connected to the ammonia receiving bottle through the receiving bottle liquid phase pipeline connecting flange 7; after being pressurized by the liquid ammonia pump 4, the liquid ammonia passes through the liquid phase mass flowmeter 5, the second filling ball valve 6 and the receiving bottle liquid phase pipeline connecting flange 7 in sequence and enters the ammonia receiving bottle liquid; the specific mass of the added liquid ammonia can be obtained through the 5 liquid phase mass flowmeter to achieve accurate control of the liquid ammonia filling; specifically, the second pipeline connecting the liquid ammonia pump 4 and the second filling ball valve 6 is higher than the first pipeline connecting the liquid ammonia pump 4 and the first filling ball valve 2.

[0025] The gas ammonia recovery module is located above the liquid ammonia filling module; the first reflux ball valve 9, the gas phase mass flowmeter 10 and the second reflux ball valve 11 are located on the third pipeline, and the third pipeline is located above the second pipeline; wherein the first reflux ball valve 9 is connected to the ammonia receiving bottle through the receiving bottle gas phase pipeline connecting flange 8; the second reflux ball valve 11 is connected to the liquid ammonia storage tank through the tank gas phase pipeline connecting flange 12; the tank gas phase pipeline connecting flange 12 is separately arranged from the tank liquid phase connecting flange 1 and is connected to different positions of the liquid ammonia storage tank; the receiving bottle gas phase pipeline connecting flange 8 and the receiving bottle liquid phase pipeline connecting flange 7 are separately arranged and connected to different positions of the ammonia receiving bottle; specifically, the tank liquid phase connecting flange 1 and the receiving bottle liquid phase pipeline connecting flange 7 are correspondingly connected to the bottom of the liquid ammonia storage tank and the bottom of the ammonia receiving bottle; the tank gas phase connecting flange 12 and the receiving bottle gas phase pipeline connecting flange 8 are correspondingly connected to the top of the liquid ammonia storage tank and the top of the ammonia receiving bottle.

[0026] During the filling process, the gaseous ammonia in the ammonia receiving bottle can be returned to the liquid ammonia storage tank through the gaseous ammonia reflux pipeline, passing through the ammonia receiving bottle gas phase pipeline connecting flange 8, the first reflux ball valve 9, the gas phase mass flowmeter 10, the second reflux ball valve 11 and the storage tank gas phase pipeline connecting flange 12 in sequence; the specific mass of the reflux gaseous ammonia can be obtained through the gas phase mass flowmeter 10; the liquid ammonia filling amount can be obtained by calculating the difference between the liquid ammonia flow rate in the liquid phase flowmeter 5 and the gaseous ammonia flow rate in the gas phase flowmeter 10.

[0027] The pipeline ammonia unloading module includes a liquid ammonia discharge ball valve 13, a gaseous ammonia discharge ball valve 14 and an ammonia absorption treatment device 23; wherein the liquid ammonia discharge valve 13 is directly connected to the liquid ammonia mass flowmeter 5 in the liquid ammonia filling module; the liquid ammonia discharge valve 13 is further connected to the ammonia absorption treatment device 23, and when the liquid ammonia discharge valve 13 is opened; the excess liquid ammonia in the liquid ammonia filling module passes through the liquid ammonia mass flowmeter 5, then passes through the liquid ammonia discharge valve 13 and enters the ammonia absorption treatment device 23 for liquid ammonia recovery and storage, so as to ensure that the flow direction of ammonia is consistent with the flowmeter. Direction requirements; Similarly, the ammonia gas discharge ball valve 14 is directly connected to the gas mass flow meter 10 in the ammonia gas recovery module; the ammonia gas discharge ball valve 14 is further connected to the ammonia absorption treatment device 23. When the ammonia gas discharge ball valve 14 is opened, the excess ammonia in the ammonia gas recovery module passes through the gas mass flow meter 10 and then passes through the ammonia gas discharge ball valve 14 and enters the ammonia adsorption treatment device 23 for ammonia recovery and storage; thereby, the liquid ammonia in the liquid ammonia filling process and the ammonia in the ammonia confluence process are recycled and utilized, reducing the liquid ammonia The risk of leakage and direct emission of ammonia gas; the ammonia adsorption treatment device 23 is connected to an ammonia discharge pipeline connecting flange 15, and the ammonia adsorption treatment device 23 is connected to the liquid ammonia discharge valve 15 and the gas ammonia discharge ball valve 14 respectively through the ammonia discharge pipeline connecting flange 15; after the filling of liquid ammonia is completed, the gas ammonia discharge ball valve 14 is opened first, and the residual ammonia gas in the gas ammonia reflux module is discharged to the ammonia absorption treatment device 23 through the ammonia discharge pipeline connecting flange 15; after the discharge is completed, the gas ammonia discharge ball valve 14 is closed, and the The liquid ammonia discharge ball valve 13 is opened; the residual liquid ammonia in the liquid ammonia filling pipeline is discharged to the ammonia absorption treatment device 23 through the ammonia discharge pipeline connecting flange 15, and the liquid ammonia discharge ball valve 13 is closed after the discharge is completed; by discharging ammonia gas first and then discharging liquid ammonia in a step-by-step manner, the residual ammonia gas and liquid ammonia can be effectively discharged from the corresponding modules; the damage caused by the reverse flow of the gas phase flowmeter due to part of the liquid ammonia entering the gas ammonia pipeline during the discharge process is avoided, or the reverse flow of the liquid phase flowmeter due to part of the gas ammonia entering the liquid ammonia pipeline is avoided.

[0028] The water curtain spray module includes an electric control integrated panel 17, a high-pressure water tank 18, an ammonia concentration detector 16, a spray control ball valve 19 and a water curtain nozzle 20; the electric control integrated panel 17 is electrically connected to the ammonia concentration detector 16, the high-pressure water tank 18 and the spray control ball valve 19; the high-pressure water tank 18 is connected to the spray control ball valve 19, and the spray control ball valve 19 is further connected to the water curtain nozzle 20; the ammonia concentration detector 16 is used to detect the ammonia concentration in the system. According to the detection result of the ammonia concentration detector 16, if ammonia leakage occurs in the ammonia filling system, the ammonia concentration detector 16 can detect and feedback in time, and control the spray control ball valve 19 through the electric control integrated panel 17 to control the water curtain spraying. When the module is opened, the water pipe is connected to the high-pressure water tank 18 to supply water to the water curtain nozzle 20, forming a water curtain to absorb the leaked ammonia and prevent further diffusion of ammonia; preferably, the electronic control integrated panel 17 is also electrically connected to the first filling ball valve 2, the second filling ball valve 6 and the liquid ammonia pump 4 in the liquid ammonia filling module; the electronic control integrated panel 17 is also electrically connected to the first reflux ball valve 9 and the second reflux ball valve 11 in the gas ammonia reflux module; the electronic control integrated panel 17 can simultaneously control the liquid ammonia filling in the liquid ammonia filling module and the gas ammonia reflux in the gas ammonia reflux module; and combined with the ammonia concentration detector 16 to detect the ammonia concentration during operation, control the water curtain spray module to deal with the leaked ammonia in time, and reduce the impact of ammonia leakage.

[0029] The present application also discloses a control method for the ammonia filling system including pipeline ammonia unloading and water curtain spraying, comprising the following steps:

[0030] Step 1: Open the first filling ball valve and the first reflux ball valve; let the liquid ammonia in the liquid ammonia storage tank pass through the first filling ball valve, filter, liquid ammonia pump liquid phase mass flow meter, and the second filling ball valve into the ammonia receiving bottle;

[0031] Step 2: The ammonia gas in the ammonia receiving bottle flows back to the liquid ammonia storage tank through the first reflux ball valve, the gas phase mass flow meter and the second reflux ball valve;

[0032] Step 3: Open the gaseous ammonia discharge ball valve and close the liquid ammonia discharge ball valve; introduce the residual ammonia in the gaseous ammonia reflux module into the ammonia absorption treatment device through the gaseous ammonia discharge ball valve;

[0033] Step 4: Close the gaseous ammonia discharge ball valve and open the liquid ammonia discharge ball valve; introduce the liquid ammonia remaining in the liquid ammonia filling module into the ammonia absorption treatment device through the liquid ammonia discharge ball valve; after the discharge is completed, close the liquid ammonia discharge ball valve to complete the filling of liquid ammonia.

[0034] In step 1 and step 2, the filling of liquid ammonia and the reflux of gaseous ammonia are carried out simultaneously, which can reduce the back pressure of the ammonia receiving bottle and improve the filling efficiency; in step 1, step 2, step 3 and step 4, the water curtain spray module is electrically connected with the liquid ammonia filling module and the gaseous ammonia reflux module; the water curtain spray module includes an electric control integrated panel, a high-pressure water tank, an ammonia concentration detector, a spray control ball valve and a water curtain nozzle; the electric control integrated panel is electrically connected with the ammonia concentration detector, the high-pressure water tank and the spray control ball valve The high-pressure water tank is connected to the spray control ball valve, which is in turn connected to the water curtain nozzle. When ammonia leakage occurs in the ammonia filling system, for example, the ammonia concentration in the system exceeds the standard, the ammonia concentration detector 16 can detect and feedback in time, and the spray control ball valve 19 is controlled by the electronic control integrated panel 17 to control the opening of the water curtain spray module. The water pipe is connected to the high-pressure water tank 18 to supply water to the water curtain nozzle 20, forming a water curtain inside the system to absorb the leaked ammonia and prevent further diffusion of ammonia.

[0035] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An ammonia filling system with pipeline ammonia unloading and water curtain spraying, including a liquid ammonia filling module, a gaseous ammonia reflux module, a pipeline ammonia unloading module and a water curtain spraying module; The two ends of the liquid ammonia filling module are respectively connected to the liquid ammonia storage tank and the ammonia receiving bottle; the liquid ammonia filling module includes a first filling ball valve, a filter, a liquid ammonia pump, a liquid phase mass flow meter, and a second filling ball valve; the filling ball valve, the filter, the liquid ammonia pump, the liquid phase mass flow meter, and the second filling ball valve are connected in series, the first filling ball valve is connected to the liquid ammonia storage tank, and the second filling ball valve is connected to the ammonia receiving bottle; The two ends of the gas ammonia recovery module are respectively connected to the liquid ammonia storage tank and the ammonia receiving bottle; the gas ammonia recovery module includes a first reflux ball valve, a gas phase mass flow meter, and a second reflux ball valve; the first reflux ball valve, the gas phase mass flow meter, and the second reflux valve are connected in series; the first reflux ball valve is connected to the ammonia receiving bottle, and the second reflux ball valve is connected to the liquid ammonia storage tank; The pipeline ammonia unloading module includes a liquid ammonia discharge ball valve, a gaseous ammonia discharge ball valve and an ammonia absorption treatment device; the liquid ammonia discharge ball valve is connected to the ammonia absorption treatment device; the gaseous ammonia discharge ball valve is connected to the ammonia absorption treatment device; the liquid ammonia discharge ball valve is connected to the gaseous ammonia recovery module, and the gaseous ammonia discharge ball valve is connected to the liquid ammonia filling module; the liquid ammonia discharge ball valve and the gaseous ammonia discharge ball valve are not connected to each other; the water curtain spray module is located above the gaseous ammonia recovery module and the liquid ammonia filling module; the water curtain spray module is used to spray water to the gaseous ammonia recovery module and the liquid ammonia filling module; The control method of the ammonia filling system including pipeline ammonia unloading and water curtain spraying comprises the following steps: Step 1: Open the first filling ball valve and the first reflux ball valve; let the liquid ammonia in the liquid ammonia storage tank pass through the first filling ball valve, filter, liquid ammonia pump liquid phase mass flow meter, and the second filling ball valve into the ammonia receiving bottle; Step 2: The ammonia gas in the ammonia receiving bottle flows back to the liquid ammonia storage tank through the first reflux ball valve, the gas phase mass flow meter and the second reflux ball valve; Step 3: Open the gaseous ammonia discharge ball valve and close the liquid ammonia discharge ball valve; The residual ammonia in the gas ammonia reflux module is introduced into the ammonia absorption treatment device through the gas ammonia discharge ball valve; Step 4: Close the gaseous ammonia discharge ball valve and open the liquid ammonia discharge ball valve; introduce the liquid ammonia remaining in the liquid ammonia filling module into the ammonia absorption treatment device through the liquid ammonia discharge ball valve; After the discharge is completed, close the liquid ammonia discharge ball valve to complete the filling of liquid ammonia.

2. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 1 is characterized in that: A tank liquid phase pipeline connecting flange is provided between the first filling ball valve and the liquid ammonia storage tank, and a receiving bottle liquid phase pipeline connecting flange is provided between the second filling ball valve and the ammonia receiving bottle; the first reflux ball valve and the ammonia receiving bottle are connected via a receiving bottle gas phase pipeline connecting flange; the second reflux ball valve and the liquid ammonia storage tank are connected via a tank gas phase pipeline connecting flange.

3. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 2 is characterized in that: The gas phase pipeline connection flange of the storage tank is separately arranged from the liquid phase pipeline connection flange of the storage tank and is connected to different positions of the liquid ammonia storage tank; the gas phase pipeline connection flange of the receiving bottle and the liquid phase pipeline connection flange of the receiving bottle are separately arranged and are connected to different positions of the ammonia receiving bottle.

4. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 3 is characterized in that: The liquid phase connecting flange of the storage tank and the liquid phase pipeline connecting flange of the receiving bottle are correspondingly connected to the bottom of the liquid ammonia storage tank and the bottom of the ammonia receiving bottle; the gas phase connecting flange of the storage tank and the gas phase pipeline connecting flange of the receiving bottle are correspondingly connected to the top of the liquid ammonia storage tank and the top of the ammonia receiving bottle.

5. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 1 is characterized in that: The first filling ball valve is connected to the filter and the liquid ammonia pump via a first pipeline, and the liquid ammonia pump is connected to the liquid phase mass flow meter and the second filling ball valve via a second pipeline; The first pipeline and the second pipeline are connected, the second pipeline is arranged higher than the first pipeline, and the first reflux ball valve, the gas phase mass flow meter and the second reflux ball valve are located on the third pipeline; The third pipeline is located above the second pipeline.

6. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 1 is characterized in that: The liquid ammonia discharge valve is directly connected to the liquid ammonia mass flowmeter, and the gaseous ammonia discharge ball valve is directly connected to the gas phase mass flowmeter; When the liquid ammonia discharge valve is opened, the excess liquid ammonia in the liquid ammonia filling module passes through the liquid ammonia mass flowmeter, then passes through the liquid ammonia discharge valve and then enters the ammonia absorption treatment device for liquid ammonia recovery and storage; when the gaseous ammonia discharge ball valve is opened, the excess ammonia in the gaseous ammonia recovery module passes through the gas phase mass flowmeter, then passes through the gaseous ammonia discharge ball valve and enters the ammonia adsorption treatment device for ammonia recovery and storage.

7. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 6, characterized in that: The ammonia adsorption treatment device is connected to an ammonia discharge pipeline connecting flange, and the ammonia adsorption treatment device is connected to the liquid ammonia discharge valve and the gaseous ammonia discharge ball valve respectively through the ammonia discharge pipeline connecting flange.

8. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 1 is characterized in that: The water curtain spray module includes an electronic control integrated panel, a high-pressure water tank, an ammonia concentration detector, a spray control ball valve and a water curtain nozzle; the electronic control integrated panel is electrically connected to the ammonia concentration detector, the high-pressure water tank and the spray control ball valve; the high-pressure water tank is connected to the spray control ball valve, and the spray control ball valve is further connected to the water curtain nozzle.

9. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 8, characterized in that: The electronic control integrated panel is also electrically connected to the first filling ball valve, the second filling ball valve and the liquid ammonia pump in the liquid ammonia filling module; the electronic control integrated panel is also electrically connected to the first reflux ball valve and the second reflux ball valve in the gas ammonia reflux module.

10. The ammonia filling system with pipeline ammonia unloading and water curtain spraying according to claim 9, characterized in that: According to the detection result of the ammonia concentration detector, the electronic control integrated panel controls the spray control ball valve and controls the high-pressure water tank to supply water to the water curtain nozzle to form a water curtain inside the system.

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