Gas ammonia supply system capable of being flexibly switched and method for flexibly switching gas ammonia supply

Abstract

In order to overcome the defects in the prior art, the invention provides a gas ammonia supply system capable of being flexibly switched, the gas ammonia supply system comprises a liquid ammonia-gas ammonia conveying system and a gas ammonia conveying system, and the liquid ammonia-gas ammonia conveying system and the gas ammonia conveying system independently or jointly provide gas ammonia for a subsequent system. The liquid ammonia-gaseous ammonia conveying system comprises a liquid ammonia supply subsystem and a liquid ammonia vaporizer. The liquid ammonia supply subsystem provides liquid ammonia for the liquid ammonia vaporizer, and the liquid ammonia vaporizer vaporizes the liquid ammonia into gas ammonia and outputs the gas ammonia to the gas ammonia header pipe. The liquid ammonia supply subsystem comprises at least two of a bottle type liquid ammonia supply system, a liquid ammonia pipe network supply system and a liquid ammonia storage tank supply system. And the gas ammonia conveying system outputs gas ammonia to a gas ammonia main pipe through a compressor. According to the invention, integration of a plurality of gas ammonia supply modes is organically realized, so that a user can switch among the plurality of gas ammonia supply modes according to different actual conditions, thereby ensuring stable supply of gas ammonia.

Description

Technical Field

[0001] This invention relates to the field of industrial production technology, and in particular to a flexible ammonia supply system and a method for flexibly switching ammonia supply. Background Technology

[0002] Flue gas denitrification technology has received widespread attention as an effective means of reducing NOx emissions. Gaseous ammonia, as a commonly used denitrification reducing agent, has advantages such as fast reaction speed and high denitrification efficiency.

[0003] However, existing ammonia supply technologies often suffer from fixed processes, limited functionality, difficulty in operational adjustments, and high energy consumption. These issues restrict the flexibility and economic efficiency of ammonia production, making it difficult for companies to quickly adjust their production strategies when faced with new plant commissioning. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a flexibly switchable ammonia supply system, comprising a liquid ammonia-gas ammonia delivery system and a gas ammonia delivery system, wherein the liquid ammonia-gas ammonia delivery system and the gas ammonia delivery system, individually or jointly, supply gas ammonia to subsequent systems.

[0005] The liquid ammonia-gas ammonia delivery system includes: a liquid ammonia supply subsystem and a liquid ammonia vaporizer. The liquid ammonia supply subsystem supplies liquid ammonia to the liquid ammonia vaporizer, which vaporizes the liquid ammonia into gaseous ammonia and outputs gaseous ammonia to the main gaseous ammonia pipeline. The liquid ammonia supply subsystem includes at least two of the following: a bottled liquid ammonia supply system, a liquid ammonia pipeline supply system, and a liquid ammonia storage tank supply system.

[0006] The ammonia delivery system outputs ammonia gas to the main ammonia pipeline via a compressor.

[0007] Furthermore, the bottled liquid ammonia supply system includes several liquid ammonia cylinders. Each liquid ammonia cylinder is connected to the liquid ammonia input terminal of the liquid ammonia vaporizer via a first liquid ammonia delivery pipeline. A first switching valve is provided at the connection point between the first liquid ammonia delivery pipeline and the liquid ammonia cylinder.

[0008] Furthermore, the bottled liquid ammonia supply system also includes a liquid ammonia cylinder base. The liquid ammonia cylinder base has a grooved surface that matches the liquid ammonia cylinder.

[0009] Furthermore, the bottled liquid ammonia supply system also includes an electronic weighing device for weighing the liquid ammonia cylinders.

[0010] Furthermore, the liquid ammonia pipeline supply system includes a second liquid ammonia delivery pipeline connecting the external liquid ammonia pipeline network and the liquid ammonia input end of the liquid ammonia vaporizer. A second switching valve is installed on the second liquid ammonia delivery pipeline.

[0011] Furthermore, the liquid ammonia storage tank supply system includes: a third liquid ammonia delivery pipeline connecting the external liquid ammonia pipeline network and the liquid ammonia storage tank input end, and a third switching valve is provided on the third liquid ammonia delivery pipeline. The liquid ammonia storage tank output end is connected to the liquid ammonia input end of the liquid ammonia vaporizer via a fourth pipeline, and at least one liquid ammonia booster pump is provided on the fourth pipeline. A fifth switching valve is provided on the fourth pipeline between the liquid ammonia booster pump and the liquid ammonia input end of the liquid ammonia vaporizer.

[0012] Furthermore, the liquid ammonia vaporizer is heated by a heating element, and a flow control valve is installed on the ammonia gas output pipe.

[0013] In addition, the present invention provides a method for flexibly switching the supply of ammonia gas, using a flexibly switchable ammonia gas supply system as described above for supplying ammonia gas.

[0014] Furthermore, during normal production, the gaseous ammonia delivery system outputs gaseous ammonia to the main gaseous ammonia pipeline for use by downstream production equipment.

[0015] When the demand for ammonia is small or the infrastructure in the area is inadequate, a bottled liquid ammonia supply system is used to supply liquid ammonia to the liquid ammonia vaporizer, which then vaporizes the liquid ammonia into gaseous ammonia.

[0016] When the gaseous ammonia delivery system needs maintenance and cannot supply gaseous ammonia normally, the liquid ammonia pipeline supply system is activated first to supply liquid ammonia to the liquid ammonia vaporizer, which then vaporizes the liquid ammonia into gaseous ammonia.

[0017] When the liquid ammonia pressure supplied by the liquid ammonia pipeline supply system does not meet the requirements of the liquid ammonia vaporizer, liquid ammonia is supplied to the liquid ammonia vaporizer through the liquid ammonia storage tank supply system, and the liquid ammonia vaporizer vaporizes the liquid ammonia into gaseous ammonia.

[0018] Furthermore, the bottled liquid ammonia supply system includes an electronic weighing device for weighing the liquid ammonia cylinders. When supplying liquid ammonia using the bottled liquid ammonia supply system, the following analysis is performed:

[0019] Step 1: Obtain a non-replaceable liquid ammonia cylinder and obtain its current mass M. 0-n And determine M 0-n Is it greater than M? x , such as M 0-n >M x If n is selected, the liquid ammonia cylinder is set as an optional liquid ammonia cylinder; otherwise, it is set as a liquid ammonia cylinder to be replaced. Here, n is the natural number of the number of liquid ammonia cylinders installed in the bottled liquid ammonia supply system, and M... x The preset threshold for identifying empty bottles is used.

[0020] Step 2: Arrange all optional liquid ammonia cylinders according to M 0-nThe quality is sorted to obtain sequence list A, and M is selected from sequence list A. 0-n The lowest-priced liquid ammonia cylinder is selected as the preferred liquid ammonia cylinder, and liquid ammonia is supplied by the preferred liquid ammonia cylinder.

[0021] Step 3: Record the quality M of the liquid ammonia supply cylinder in real time. T-n And calculate the mass change value M of the liquid ammonia supply cylinder. c-n =(M 0-n )-(M T-n ), and determine M c-n Is it less than or equal to M? Q , such as M c-n ≤M Q If the liquid ammonia supply cylinder is stopped, the liquid ammonia supply cylinder is marked as a liquid ammonia cylinder to be replaced, and the liquid ammonia supply cylinder is deleted from sequence list A, generating sequence list B.

[0022] Step 4: Replace the sequence list A in step 2 with the newly generated sequence list B, and repeat steps 2 to 3 until the number of selectable liquid ammonia cylinders in the sequence list is less than the preset threshold.

[0023] Step 5 prompts the manager to replace all marked liquid ammonia cylinders to be replaced, and after the liquid ammonia cylinders to be replaced are completed, return to step 1.

[0024] This invention has at least one of the following beneficial effects:

[0025] (1) The present invention organically integrates multiple ammonia supply methods, allowing users to switch between multiple ammonia supply methods according to different actual conditions, thereby ensuring a stable supply of ammonia.

[0026] (2) This invention enables effective judgment and management of the supply of liquid ammonia cylinders, overcoming the difficulties in the supply management of liquid ammonia cylinders. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the flexible ammonia supply system of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the lateral structure of the flexible switchable ammonia supply system is shown.

[0029] Figure 3 for Figure 1 The diagram shows the rear structure of a flexible ammonia supply system. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] Please note that the terms "above", "below", "left", "right", "top", "top", "bottom", "bottom", etc., used in this invention to describe positional relationships do not represent the absolute positional relationship between modules / components / assemblies / parts / components, but rather the relative positional relationship between modules / components / assemblies / parts / components.

[0032] This invention provides, by way of example, a flexibly switchable ammonia supply system, such as... Figure 1-3 As shown, the system includes a liquid ammonia-gastric ammonia conveying system and a gaseous ammonia conveying system installed on the target working surface 1. The liquid ammonia-gastric ammonia conveying system and the gaseous ammonia conveying system, individually or jointly, supply gaseous ammonia to subsequent systems. The target working surface 1 can be the factory floor, a supporting surface of a three-dimensional production system, or other supporting surfaces or supporting systems used as needed to house the various systems described in this invention.

[0033] The liquid ammonia-gas ammonia delivery system includes: a liquid ammonia supply subsystem and a liquid ammonia vaporizer 8. The liquid ammonia supply subsystem supplies liquid ammonia to the liquid ammonia vaporizer 8, which vaporizes the liquid ammonia into gaseous ammonia and outputs gaseous ammonia to the main gaseous ammonia pipeline. The liquid ammonia supply subsystem includes at least two of the following: a bottled liquid ammonia supply system, a liquid ammonia pipeline supply system, and a liquid ammonia storage tank supply system.

[0034] The ammonia delivery system outputs ammonia to the main ammonia pipe via compressor 3.

[0035] Compared with existing ammonia supply technologies, which suffer from fixed processes, limited options, difficult adjustments, and high energy consumption, this invention organically integrates multiple ammonia supply methods, allowing users to switch between them according to their specific needs, thus ensuring a stable supply of ammonia.

[0036] This invention provides, by way of example, a bottled liquid ammonia supply system, such as... Figure 1-3 As shown, it includes several liquid ammonia cylinders 7. Each liquid ammonia cylinder 7 is connected to the liquid ammonia input terminal of a liquid ammonia vaporizer 8 via a first liquid ammonia delivery pipeline. A first switching valve 16 is provided at the connection point between the first liquid ammonia delivery pipeline and the liquid ammonia cylinder 7.

[0037] When the bottled liquid ammonia supply system needs to supply liquid ammonia to the liquid ammonia vaporizer 8, at least one of several liquid ammonia cylinders 7 can be selected, and the first switch valve 16 connected to the selected liquid ammonia cylinder 7 can be opened, so that the liquid ammonia in the selected liquid ammonia cylinder 7 is transported along the first liquid ammonia delivery pipeline to the liquid ammonia input end of the liquid ammonia vaporizer 8 under the action of the internal pressure of the liquid ammonia cylinder 7, thereby realizing the supply of liquid ammonia to the liquid ammonia vaporizer 8.

[0038] This invention provides, by way of example, a bottled liquid ammonia supply system, such as... Figure 1-3 As shown, the above-mentioned bottled liquid ammonia supply system also includes a liquid ammonia cylinder base 4. The liquid ammonia cylinder base 4 is provided with a grooved surface that matches the liquid ammonia cylinder 7.

[0039] When in use, the liquid ammonia cylinder 7 can be placed on the liquid ammonia cylinder base 4 to limit the installation of the liquid ammonia cylinder 7.

[0040] This invention provides an exemplary bottled liquid ammonia supply system, which further includes an electronic weighing device for weighing the liquid ammonia cylinder 7. In this case, the real-time weight of the liquid ammonia cylinder 7 can be obtained through the electronic weighing device.

[0041] This invention provides, by way of example, a liquid ammonia pipeline supply system, such as... Figure 1-3 As shown, it includes: a second liquid ammonia delivery pipeline connecting the external liquid ammonia pipeline network and the liquid ammonia vaporizer 8 to the liquid ammonia input end. A second switching valve 17 is installed on the second liquid ammonia delivery pipeline.

[0042] When the liquid ammonia pipeline supply system needs to supply liquid ammonia to the liquid ammonia vaporizer 8, the second switch valve 17 on the second liquid ammonia delivery pipeline is opened, so that the liquid ammonia from the external liquid ammonia pipeline can be delivered to the liquid ammonia input end of the liquid ammonia vaporizer 8 through the second liquid ammonia delivery pipeline.

[0043] This invention provides, by way of example, a liquid ammonia storage tank supply system, such as... Figure 1-3 As shown, it includes: a third liquid ammonia delivery pipeline connecting the external liquid ammonia pipeline network and the input end of the liquid ammonia storage tank 2, and a third switch valve 18 is provided on the third liquid ammonia delivery pipeline. The output end of the liquid ammonia storage tank 2 is connected to the liquid ammonia input end of the liquid ammonia vaporizer 8 through a fourth pipeline, and a first liquid ammonia booster pump 5 and a second liquid ammonia booster pump 6 are connected to the fourth pipeline through two pipelines. A fifth switch valve 19 is provided on the fourth pipeline between the liquid ammonia booster pump and the liquid ammonia input end of the liquid ammonia vaporizer 8.

[0044] When the liquid ammonia storage tank supply system needs to supply liquid ammonia to the liquid ammonia vaporizer 8, the fifth switch valve 19 on the fourth liquid ammonia delivery pipeline is opened, which allows the liquid ammonia stored in the liquid ammonia storage tank 2 to be delivered to the liquid ammonia input end of the liquid ammonia vaporizer 8 through the fourth liquid ammonia delivery pipeline. The liquid ammonia booster pump can supplement the pressure when the liquid ammonia pressure provided by the liquid ammonia storage tank 2 is insufficient.

[0045] If the liquid ammonia storage tank 2 is insufficient, the third switch valve 18 on the third liquid ammonia delivery pipeline can be opened to supply liquid ammonia to the liquid ammonia storage tank 2 using liquid ammonia from the external liquid ammonia pipeline network, thereby replenishing the liquid ammonia storage tank 2.

[0046] This invention provides an exemplary liquid ammonia vaporizer 8, which is heated by a heating assembly 9 and has a flow control valve 10 on the ammonia gas output pipe. The flow control valve 10 is used to control the flow rate of ammonia gas output from the ammonia gas output pipe to the boiler.

[0047] This invention provides an exemplary method for flexibly switching ammonia supply, which employs a flexibly switchable ammonia supply system as described above. Specifically, the method includes:

[0048] During normal production, gaseous ammonia is supplied to the main gaseous ammonia pipeline via the gaseous ammonia delivery system for use by downstream production equipment.

[0049] When the demand for ammonia is small or the infrastructure in the area is inadequate, a bottled liquid ammonia supply system is used to supply liquid ammonia to the liquid ammonia vaporizer 8, and the liquid ammonia vaporizer 8 vaporizes the liquid ammonia into gaseous ammonia.

[0050] When the gaseous ammonia delivery system needs maintenance and cannot supply gaseous ammonia normally, the liquid ammonia pipeline supply system is activated first to supply liquid ammonia to the liquid ammonia vaporizer 8, and the liquid ammonia vaporizer 8 vaporizes the liquid ammonia into gaseous ammonia.

[0051] When the liquid ammonia pressure supplied by the liquid ammonia pipeline supply system does not meet the requirements of the liquid ammonia vaporizer 8, liquid ammonia is supplied to the liquid ammonia vaporizer 8 through the liquid ammonia storage tank supply system, and the liquid ammonia vaporizer 8 vaporizes the liquid ammonia into gaseous ammonia.

[0052] Specifically:

[0053] During the project construction, the park's infrastructure was incomplete, and there were many cross-operations involving open flames. The boiler denitrification unit had a small demand for ammonia during its initial start-up phase, and storing a large amount of liquid ammonia on site would constitute a major hazard, requiring an upgrade in on-site control. This was extremely inconvenient for on-site construction. Therefore, liquid ammonia cylinders with small storage capacity and high safety became the preferred choice. Cylinders filled with liquid ammonia were purchased and transported to the site. The liquid ammonia cylinders were connected to the liquid ammonia vaporizer through steel pipes, and preheated using waste heat from steam. The liquid ammonia gas at the outlet of the liquid ammonia vaporizer was controlled within a certain pressure and temperature range by the liquid level regulating valve, temperature regulating valve, and outlet pressure regulating valve of the liquid ammonia vaporizer. Then, it was transported to the boiler's denitrification system through a high-efficiency, low-resistance pipeline.

[0054] During normal production or compressor system maintenance, liquid ammonia comes from the plant's liquid ammonia pipeline network at a working pressure of 2.45 MPa and a working temperature of 40°C. It enters the liquid ammonia vaporizer through valve control, and is then preheated using waste heat from steam. The liquid ammonia gas at the outlet of the liquid ammonia vaporizer is controlled within a certain pressure and temperature range through the liquid level regulating valve, temperature regulating valve, and pressure regulating valve at the outlet of the liquid ammonia vaporizer. It is then transported to the boiler's denitrification system through a high-efficiency, low-resistance pipeline.

[0055] During compressor system shutdown, liquid ammonia from the pipeline enters the liquid ammonia storage tank, is pressurized to 1.2–1.5 MPa by a pump, and has a temperature of -14.7–38.5°C. It then enters the liquid ammonia vaporizer, where it is preheated using waste heat from steam. The liquid ammonia gas at the outlet of the liquid ammonia vaporizer is controlled within a certain pressure and temperature range by the liquid level regulating valve, temperature regulating valve, and pressure regulating valve at the outlet of the liquid ammonia vaporizer. Finally, it is transported to the boiler's denitrification system via a high-efficiency, low-resistance pipeline.

[0056] During normal production, the compressor outlet provides gaseous ammonia at a pressure of 1.653 MPaG and a temperature of 102℃. After being reduced to 0.4 MPaG and a temperature of 90-100℃ by the pressure regulating valve, it is sent into the main gaseous ammonia pipe and then transported to the boiler pipe network through pipelines.

[0057] The four ammonia supply processes of this invention can be switched between each other. During normal operation, the process from liquid ammonia cylinder to vaporizer is switched to supplying ammonia to the boiler via the compressor outlet. First, liquid ammonia is drawn from the liquid ammonia pipeline to the liquid ammonia storage tank to establish a liquid level of 50%-60%. After passing through the economizer, the temperature and pressure are reduced to 10°C and 0.515 MPaG before being sent to the subcooler. The liquid ammonia in the shell side vaporizes and absorbs heat to cool the liquid ammonia in the tube side to below -15°C, and then is sent to the methanol wash ammonia coolers. Each ammonia cooler absorbs heat and vaporizes into ammonia gas, which enters the compressor inlet. After being pressurized to 1.653 MPaG and heated to 102°C by the compressor, a large portion of the ammonia gas is cooled by the circulating water heat exchanger and flows into the liquid ammonia storage tank. It then enters the economizer for continued circulation. A portion of the ammonia gas is depressurized to 0.4 MPaG via the regulating valve before being sent to the ammonia pipeline. For switching between the two processes, first open the pressure regulating valve from the compressor outlet to the main ammonia gas pipe, set the pressure after the valve to 0.4 MPaG, then slowly close the steam regulating valve and the inlet liquid level regulating valve of the liquid ammonia vaporizer until they are fully closed. After the vaporizer pressure no longer rises, disconnect them and monitor the vaporizer pressure to prevent overpressure.

[0058] The compressor system is a closed loop. During operation, non-condensable gases such as hydrogen and nitrogen are released from the liquid ammonia at low pressure, which will cause the system pressure to rise and energy consumption to increase. Supplying ammonia through the compressor outlet can reduce the accumulation of non-condensable gases and save energy. At the same time, the compressor outlet pressure regulating valve can automatically control the pressure to ensure the stability of the boiler ammonia gas.

[0059] This invention provides an exemplary bottled liquid ammonia supply system, including an electronic weighing device for weighing liquid ammonia cylinders 7. When supplying liquid ammonia using this bottled liquid ammonia supply system, the following analysis is performed:

[0060] Step 1: Obtain a non-replaceable liquid ammonia cylinder and obtain the current mass M of the liquid ammonia cylinder 7. 0-n And determine M 0-n Is it greater than M? x , such as M 0-n >M x If n is selected, then liquid ammonia cylinder 7 is set as an optional liquid ammonia cylinder; otherwise, liquid ammonia cylinder 7 is set as a liquid ammonia cylinder to be replaced. Where n is the natural number of the number of liquid ammonia cylinders 7 installed in the bottled liquid ammonia supply system, and M... x The preset threshold for identifying empty bottles is used.

[0061] Step 2: Arrange all optional liquid ammonia cylinders according to M 0-n The quality is sorted to obtain sequence list A, and M is selected from sequence list A. 0-n The lowest-grade liquid ammonia cylinder 7 is the current preferred liquid ammonia cylinder, and liquid ammonia is supplied by the current preferred liquid ammonia cylinder.

[0062] Step 3: Record the quality M of the liquid ammonia supply cylinder in real time.T-n And calculate the mass change value M of the liquid ammonia supply cylinder. c-n =(M 0-n )-(M T-n ), and determine M c-n Is it less than or equal to M? Q , such as M c-n ≤M Q If the liquid ammonia supply cylinder is stopped, the liquid ammonia supply cylinder is marked as a liquid ammonia cylinder to be replaced, and the liquid ammonia supply cylinder is deleted from sequence list A, generating sequence list B.

[0063] Step 4: Replace the sequence list A in step 2 with the newly generated sequence list B, and repeat steps 2 to 3 until the number of selectable liquid ammonia cylinders in the sequence list is less than the preset threshold.

[0064] Step 5 prompts the manager to replace all marked liquid ammonia cylinders to be replaced, and after the liquid ammonia cylinders to be replaced are completed, return to step 1.

[0065] Bottled liquid ammonia supply systems have the following advantages:

[0066] (1) Breaking the constraints of park conditions;

[0067] (2) Flexible operation: The liquid ammonia cylinder supply process is simple to operate and can easily adjust the supply of gaseous ammonia according to actual needs, thus achieving flexible operation.

[0068] (3) Safe and reliable. The storage and transportation of liquid ammonia cylinders follow strict safety standards, which can ensure the safety and reliability of the entire process. At the same time, the liquid ammonia is in a liquid state in the cylinder, the pressure is stable, and it is not easy to leak, which greatly reduces the safety risk.

[0069] (4) Convenient storage: Liquid ammonia cylinders are small in size and require little storage space, making them convenient to set up and use on-site.

[0070] (5) Convenient transportation: Liquid ammonia cylinders are conveniently transported by the manufacturer’s dedicated vehicles, reducing the risks during transportation.

[0071] However, the main reason why existing technologies rarely use liquid ammonia cylinders for liquid ammonia supply is that it is difficult to accurately monitor the liquid ammonia level in the cylinders. For example, using a hydraulic gauge to indirectly determine the liquid ammonia level based on the output pressure from the cylinder can be problematic when adjusting the output pressure. This means that the cylinder's output might only be considered complete when the output pressure is significantly insufficient or zero. Switching to a different cylinder at this point introduces a pressure fluctuation, leading to unstable output. This invention overcomes the shortcomings of existing technologies by directly measuring the weight change throughout the cylinder's output process. It allows for real-time and accurate measurement of the liquid ammonia output, enabling timely switching between cylinders for output. This ensures stable liquid ammonia output even when using liquid ammonia cylinders, making it a practical solution.

[0072] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A flexible ammonia supply system, characterized in that, It includes a liquid ammonia-gas ammonia delivery system and a gas ammonia delivery system, and the liquid ammonia-gas ammonia delivery system and the gas ammonia delivery system, individually or jointly, provide gas ammonia to the subsequent systems; The liquid ammonia-gas ammonia delivery system includes: a liquid ammonia supply subsystem and a liquid ammonia vaporizer (8); the liquid ammonia supply subsystem supplies liquid ammonia to the liquid ammonia vaporizer (8), and the liquid ammonia vaporizer (8) vaporizes the liquid ammonia into gaseous ammonia and outputs gaseous ammonia to the gaseous ammonia main pipe; the liquid ammonia supply subsystem includes at least two of the following: a bottle-type liquid ammonia supply system, a liquid ammonia pipeline supply system, and a liquid ammonia storage tank supply system; The ammonia delivery system outputs ammonia to the main ammonia pipe via a compressor (3).

2. The flexibly switchable ammonia supply system according to claim 1, characterized in that, The bottled liquid ammonia supply system includes: several liquid ammonia cylinders (7); the liquid ammonia cylinders (7) are connected to the liquid ammonia input end of the liquid ammonia vaporizer (8) through a first liquid ammonia delivery pipeline; the first liquid ammonia delivery pipeline is provided with a first switch valve (16) at the connection point with the liquid ammonia cylinders (7).

3. The flexibly switchable ammonia supply system according to claim 2, characterized in that, The bottled liquid ammonia supply system also includes: a liquid ammonia cylinder base (4); the liquid ammonia cylinder base (4) is provided with a groove surface that matches the liquid ammonia cylinder (7).

4. The flexibly switchable ammonia supply system according to claim 2 or 3, characterized in that, The bottled liquid ammonia supply system also includes an electronic weighing device for weighing the liquid ammonia cylinder (7).

5. The flexibly switchable ammonia supply system according to claim 1, characterized in that, The liquid ammonia pipeline supply system includes: a second liquid ammonia delivery pipeline connecting the external liquid ammonia pipeline and the liquid ammonia vaporizer (8) to the liquid ammonia input end; a second switch valve (17) is provided on the second liquid ammonia delivery pipeline.

6. The flexibly switchable ammonia supply system according to claim 1, characterized in that, The liquid ammonia storage tank supply system includes: a third liquid ammonia delivery pipeline connecting the external liquid ammonia pipeline network and the input end of the liquid ammonia storage tank (2), and a third switch valve (18) is provided on the third liquid ammonia delivery pipeline; the output end of the liquid ammonia storage tank (2) is connected to the liquid ammonia input end of the liquid ammonia vaporizer (8) through a fourth pipeline, and at least one liquid ammonia booster pump is provided on the fourth pipeline; a fifth switch valve (19) is provided on the fourth pipeline between the liquid ammonia booster pump and the liquid ammonia input end of the liquid ammonia vaporizer (8).

7. The flexibly switchable ammonia supply system according to claim 1, characterized in that, The liquid ammonia vaporizer (8) is heated by the heating assembly (9) and a flow control valve (10) is provided on the ammonia gas output pipe.

8. A method for flexibly switching ammonia gas supply, characterized in that, Ammonia gas is supplied using a flexible ammonia gas supply system as described in any one of claims 1-7.

9. The method for flexibly switching ammonia supply according to claim 8, characterized in that, During normal production, gaseous ammonia is output to the main gaseous ammonia pipeline through the gaseous ammonia delivery system for use by downstream production equipment; When the demand for ammonia is small or the infrastructure in the area is inadequate, a bottled liquid ammonia supply system is used to supply liquid ammonia to the liquid ammonia vaporizer (8), and the liquid ammonia is vaporized into gaseous ammonia by the liquid ammonia vaporizer (8). When the gaseous ammonia delivery system needs maintenance and cannot supply gaseous ammonia normally, the liquid ammonia pipeline supply system is started first to supply liquid ammonia to the liquid ammonia vaporizer (8), and the liquid ammonia vaporizer (8) vaporizes the liquid ammonia into gaseous ammonia; When the liquid ammonia pressure supplied by the liquid ammonia pipeline supply system does not meet the requirements of the liquid ammonia vaporizer (8), liquid ammonia is supplied to the liquid ammonia vaporizer (8) through the liquid ammonia storage tank supply system, and the liquid ammonia vaporizer (8) vaporizes the liquid ammonia into gaseous ammonia.

10. The method for flexibly switching ammonia supply according to claim 8, characterized in that, The bottled liquid ammonia supply system includes an electronic weighing device for weighing the liquid ammonia cylinder (7); when supplying liquid ammonia using the bottled liquid ammonia supply system, the following analysis is performed: Step 1: Obtain a non-replaceable liquid ammonia cylinder and obtain the current mass M of the liquid ammonia cylinder (7). 0-n And determine M 0-n Is it greater than M? x , such as M 0-n >M x， Then, the liquid ammonia cylinder (7) is set as an optional liquid ammonia cylinder; otherwise, the liquid ammonia cylinder (7) is set as a liquid ammonia cylinder to be replaced; where n is the natural number of the several liquid ammonia cylinders (7) installed in the bottled liquid ammonia supply system, and M x A preset threshold for identifying empty bottles is set. Step 2: Arrange all optional liquid ammonia cylinders according to M 0-n The quality is sorted to obtain sequence list A, and M is selected from sequence list A. 0-n The lowest liquid ammonia cylinder (7) is used as the current preferred liquid ammonia cylinder, and the liquid ammonia is supplied by the current preferred liquid ammonia cylinder; Step 3: Record the quality M of the liquid ammonia supply cylinder in real time. T-n And calculate the mass change value M of the liquid ammonia supply cylinder. c-n =(M 0-n )-(M T-n ), and determine M c-n Is it less than or equal to M? Q , such as M c-n ≤M Q If the liquid ammonia supply is stopped, the liquid ammonia supply cylinder is marked as a liquid ammonia cylinder to be replaced, and the liquid ammonia supply cylinder is deleted from the sequence list A, generating the sequence list B; Step 4: Replace the sequence list A in step 2 with the newly generated sequence list B, and repeat steps 2 to 3 until the number of selectable liquid ammonia cylinders in the sequence list is less than the preset threshold. Step 5 prompts the manager to replace all marked liquid ammonia cylinders to be replaced, and after the liquid ammonia cylinders to be replaced are completed, return to step 1.

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