Ammonia fuel supply system for visual test and supply method thereof

Abstract

A wide pressure range ammonia fuel supply system and supply method for visualization test, relates to the field of ship zero-carbon energy saving and emission reduction technology. The problem of high / low pressure ammonia fuel spray and combustion research conducted by the high combustion conditions required for the application of ammonia fuel on the engine. The system uses a low-pressure gas-phase ammonia fuel supply path to deliver ammonia fuel to an ammonia fuel injection module, and also delivers ammonia fuel to the ammonia fuel injection module after pressurizing the ammonia fuel through a pressurized supply path; ammonia fuel is also delivered to a high-pressure liquid ammonia supply submodule; the high-pressure liquid ammonia supply submodule delivers ammonia fuel to the ammonia fuel injection module after pressurizing and processing the ammonia fuel; the ammonia fuel injection module delivers ammonia fuel to the comprehensive measurement and control module; the comprehensive measurement and control module conducts tests; the pipeline cleaning module is used to clean the waste ammonia fuel in the pipeline and deliver it to the waste fuel treatment module for treatment; the present application is suitable for the research in the field of zero-carbon fuel spray combustion.

Description

Technical Field

[0001] This invention relates to the field of zero-carbon energy conservation and emission reduction technology for ships. Background Technology

[0002] Most ocean-going vessels use internal combustion engines for propulsion. While carbon-based fuels such as marine light diesel and heavy oil can meet the load requirements of ship navigation, they have high greenhouse gas and particulate matter emissions. Electric propulsion, although clean, fast-response, and efficient, has limitations in range and load capacity, as well as high maintenance costs. The marine engine industry is actively seeking new energy sources to replace traditional fossil fuels, such as ammonia, natural gas, and methanol. Using these low-carbon or zero-carbon fuels is a new way to achieve emission reduction.

[0003] Studies by Blarigan et al. have shown that pure ammonia can only successfully auto-ignite at extremely high compression ratios (>35), indicating that the combustion of pure ammonia requires high combustion conditions. Many studies have investigated the combustion characteristics of ammonia fuel in spark ignition (SI) and compression ignition (CI) engines by injecting ammonia into the intake manifold.

[0004] In SI mode, ammonia combustion can be achieved through either spark ignition or jet ignition. In both cases, hydrogen acts as an ignition promoter and combustion stabilizer, making ammonia combustion easier to control and enhancing combustion performance. However, the interplay between engine power, NOx emissions, and unburned ammonia strongly depends on the concentration of the ammonia-hydrogen mixture, increasing the complexity of the engine control system.

[0005] For CI mode, ammonia / diesel dual-fuel (ADDF) combustion is a feasible ammonia combustion strategy. Some scholars have also found that hydrogen is very effective in accelerating ammonia combustion. Therefore, the application of ammonia fuel in compression ignition engines urgently needs to be studied.

[0006] Liquid ammonia has a high latent heat of vaporization, and its atomization and evaporation process causes a sharp drop in engine cylinder temperature. Using a jet flame to ignite ammonia results in an excessively slow combustion rate; specifically, the laminar flame velocity peaks at an equivalence ratio of 1.1, with a maximum propagation speed of only 7 cm / s. This leads to increased emissions of unburned ammonia and NOx. Therefore, it is necessary to develop a high / low-pressure ammonia fuel spray combustion testing system to investigate the effects of injection pressure, hydrogen blending ratio, and equivalence ratio on ammonia fuel atomization, evaporation, and combustion, providing a theoretical basis for the development of ammonia-fueled engines. Summary of the Invention

[0007] This invention relates to a wide-pressure-range supply system designed to address the high combustion conditions required for ammonia fuel application in engines, based on research into high / low-pressure ammonia fuel spray and combustion. The system enables ammonia fuel injection pressure to reach a wide range of 7-2000 bar, with the process visualized and flexibly adjustable.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] This invention provides a wide-pressure-range ammonia fuel supply system for visual testing, the system comprising an ammonia fuel supply module, a pipeline cleaning module, a first waste fuel treatment module, a second waste fuel treatment module, and a comprehensive measurement and control module;

[0010] The ammonia fuel supply module includes a low-pressure gas-liquid two-phase ammonia supply submodule, a high-pressure liquid ammonia supply submodule, and an ammonia fuel injection module.

[0011] The low-pressure gas-liquid two-phase ammonia supply submodule includes a low-pressure gas-phase ammonia fuel supply passage and a pressurized supply passage.

[0012] The low-pressure gas phase ammonia fuel supply passage is used to directly supply ammonia fuel to the ammonia fuel injection module, and is also used to supply the ammonia fuel to the pressurization supply passage for pressurization treatment, and to supply the pressurized ammonia fuel to the ammonia fuel injection module, and to supply ammonia fuel to the high-pressure liquid ammonia supply submodule.

[0013] The high-pressure liquid ammonia supply submodule is used to pressurize the received ammonia fuel and deliver it to the ammonia fuel injection module.

[0014] The ammonia fuel injection module is used to receive ammonia fuel and deliver the ammonia fuel to the integrated measurement and control module;

[0015] The integrated measurement and control module is used to conduct a mixing test of the received ammonia fuel with other gases;

[0016] The pipeline cleaning module is used to clean the waste ammonia fuel in the low-pressure gas phase ammonia fuel supply passage and the high-pressure liquid ammonia supply sub-module, and to transport the waste ammonia fuel to the first waste fuel treatment module and the second waste fuel treatment module, respectively.

[0017] Both the first waste fuel processing module and the second waste fuel processing module are used to process the received waste ammonia fuel.

[0018] Furthermore, in a preferred embodiment, the aforementioned low-pressure gas phase ammonia fuel supply passage includes an ammonia storage tank, a first three-way valve, a second electric valve, a fourth electric valve, a sixth electric valve, and a second manual valve.

[0019] The ammonia storage tank is equipped with a pressure reducing valve;

[0020] The first three-way valve, the second electric valve, the fourth electric valve, the sixth electric valve, and the second manual valve are connected in series with the pressure reducing valve.

[0021] The pressure reducing valve is used to reduce the pressure of ammonia fuel in the ammonia storage tank and to deliver the treated ammonia fuel to the first three-way valve.

[0022] The first three-way valve is used to deliver the received ammonia fuel to the second electric valve;

[0023] The second electric valve is used to deliver the received ammonia fuel to the fourth electric valve, and also to deliver the ammonia fuel to the pressurized supply passage;

[0024] The fourth electric valve is used to deliver the received ammonia fuel to the sixth electric valve, and also to deliver the ammonia fuel to the pressurized supply passage.

[0025] The sixth electric valve is used to deliver the received ammonia fuel to the second manual valve, and also to deliver the ammonia fuel to the first waste fuel treatment module.

[0026] The second manual valve is used to deliver the received ammonia fuel to the ammonia fuel injection module, and also to deliver ammonia fuel to the high-pressure liquid ammonia supply submodule.

[0027] Furthermore, in a preferred embodiment, the pressurization supply passage includes a hydraulic pump, a first manual valve, a first pressurization module, and a second pressurization module;

[0028] The first pressurization module includes a second three-way valve, a third electric valve, and a first piston accumulator;

[0029] The second pressurization module includes a third three-way valve, a fifth electric valve, and a second piston accumulator;

[0030] The first manual valve is connected in series at the outlet of the hydraulic pump;

[0031] The third electric valve is connected in series at the inlet of the first piston accumulator;

[0032] The fifth electric valve is connected in series at the inlet of the second piston accumulator;

[0033] The second three-way valve is connected in series with the first manual valve and the third electric valve;

[0034] The third three-way valve is connected in series with the second three-way valve and the fifth electric valve;

[0035] The hydraulic pump is used to provide hydraulic pressure to the first piston accumulator and the second piston accumulator through the second three-way valve and the third three-way valve, respectively.

[0036] The first piston accumulator is used to pressurize the ammonia fuel according to the received liquid pressure and deliver the pressurized ammonia fuel to the low-pressure gas-liquid two-phase ammonia supply submodule.

[0037] The second piston accumulator is used to pressurize the ammonia fuel according to the received liquid pressure and deliver the pressurized ammonia fuel to the low-pressure gas-liquid two-phase ammonia supply submodule.

[0038] Furthermore, in a preferred embodiment, the pipeline cleaning module includes an air compressor, a check valve, and a first electric valve;

[0039] The one-way valve and the first electric valve are connected in series at the outlet of the air compressor.

[0040] The first electric valve is connected to the first three-way valve;

[0041] The air compressor is used to deliver gas to the low-pressure gas phase ammonia fuel supply passage.

[0042] Furthermore, in a preferred embodiment, the ammonia fuel injection module includes a second pneumatic control valve and an ammonia injector;

[0043] The ammonia injector is equipped with an ammonia fuel injection valve;

[0044] The second pneumatic control valve is connected in series with the ammonia fuel injection valve;

[0045] The second pneumatic control valve is connected to the second manual valve;

[0046] The ammonia injector is used to inject the received ammonia fuel into the integrated measurement and control module.

[0047] Furthermore, in a preferred embodiment, the high-pressure liquid ammonia supply submodule includes a high-pressure booster, a pneumatic booster pump, a pressure regulator, and a first pneumatic control valve.

[0048] The second waste fuel treatment module includes a third pneumatic control valve and a second waste fuel treatment device.

[0049] The third pneumatic control valve is connected in series with the second waste fuel treatment device;

[0050] The first pneumatic control valve is connected in series at the outlet of the high-pressure booster;

[0051] The pneumatic booster pump is used to provide air pressure to the high-pressure booster.

[0052] The voltage regulator is used to maintain the pressure inside the high-pressure booster.

[0053] The high-pressure booster is used to receive ammonia fuel delivered by the second manual valve, pressurize the ammonia fuel and deliver it to the ammonia injector, and also to deliver waste ammonia fuel to the second waste fuel treatment device for processing.

[0054] Furthermore, in a preferred embodiment, the first waste fuel treatment module includes a seventh electric valve and a first waste fuel treatment device;

[0055] The seventh electric valve is connected in series with the first waste fuel treatment device;

[0056] The first waste fuel treatment device is used to treat the waste ammonia fuel delivered from the sixth electric valve.

[0057] Furthermore, in a preferred embodiment, the aforementioned integrated measurement and control module includes an optical diagnostic testing platform and a gas supply system;

[0058] The gas supply system is used to provide other gases to the optical diagnostic testing platform;

[0059] The optical diagnostic testing platform is used to receive ammonia fuel injected by the ammonia injector and to conduct mixing tests on the received ammonia fuel with other gases.

[0060] Furthermore, in a preferred embodiment, the system further includes an ECU control system;

[0061] The ECU control system is used to control the injection quantity of the ammonia fuel injection module.

[0062] The present invention also provides a wide-pressure-range ammonia fuel supply method for visualization tests, the method being implemented based on the wide-pressure-range ammonia fuel supply system for visualization tests described in any one of the above claims.

[0063] The beneficial effects of this invention are as follows:

[0064] 1. This embodiment provides a wide-pressure-range ammonia fuel supply system for visualized experiments. It employs two modes to supply ammonia fuel to the injector: a low-pressure gas-liquid two-phase ammonia supply submodule and a high-pressure liquid ammonia supply submodule. These submodules can also be integrated separately, enabling ammonia fuel testing at different pressures. The ammonia fuel supply process and the injector injection process are separated, allowing for precise pressure control. A pipeline cleaning module cleans the waste ammonia fuel in both the low-pressure gas-liquid two-phase and high-pressure liquid ammonia supply submodules, and then transports it to a first and second waste fuel treatment module for further processing. This system achieves ammonia fuel injection at a predetermined temperature of 300-400K and a pressure of 7-2000 bar. The device has a long service life, is simple to operate, provides process visualization, and offers high safety. It becomes an effective experimental tool for research in the field of zero-carbon fuel spray combustion.

[0065] This invention is applicable to research in the field of zero-carbon fuel spray combustion. Attached Figure Description

[0066] Figure 1 These are schematic diagrams of the wide pressure range ammonia fuel supply system for visualization testing as described in embodiments one through nine.

[0067] Figure 2 This is a schematic diagram of the low-pressure ammonia fuel spray combustion test system described in Embodiment 10;

[0068] Figure 3 This is a schematic diagram of the high-pressure ammonia fuel spray combustion test system described in Embodiment 10.

[0069] Among them, 1-ammonia storage tank, 2-air compressor, 3-hydraulic pump, 4-check valve, 5-first manual valve, 6-first three-way valve, 7-first electric valve, 8-second electric valve, 9-first piston accumulator, 10-third electric valve, 11-second three-way valve, 12-fourth electric valve, 13-second piston accumulator, 14-fifth electric valve, 15-third three-way valve, 16-sixth electric valve, 17-second manual valve, 18-seventh electric valve, 19-ammonia fuel injection valve, 20-optical diagnostic testing platform, 21-gas supply system, 22-high-pressure booster, 23-pneumatic booster pump, 24-first pneumatic control valve, 25-pressure stabilizer, 26-second pneumatic control valve, 27-third pneumatic control valve, 28-first waste fuel treatment device, 29-ammonia injector, 30-second waste fuel treatment device. Detailed Implementation

[0070] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

[0071] Implementation Method 1. See [link / reference] Figure 1 This embodiment describes a wide-pressure-range ammonia fuel supply system for visualization testing. The system includes an ammonia fuel supply module, a pipeline cleaning module, a first waste fuel treatment module, a second waste fuel treatment module, and a comprehensive measurement and control module.

[0072] The ammonia fuel supply module includes a low-pressure gas-liquid two-phase ammonia supply submodule, a high-pressure liquid ammonia supply submodule, and an ammonia fuel injection module.

[0073] The low-pressure gas-liquid two-phase ammonia supply submodule includes a low-pressure gas-phase ammonia fuel supply passage and a pressurized supply passage.

[0074] The low-pressure gas phase ammonia fuel supply passage is used to directly supply ammonia fuel to the ammonia fuel injection module, and is also used to supply the ammonia fuel to the pressurization supply passage for pressurization treatment, and to supply the pressurized ammonia fuel to the ammonia fuel injection module, and to supply ammonia fuel to the high-pressure liquid ammonia supply submodule.

[0075] The high-pressure liquid ammonia supply submodule is used to pressurize the received ammonia fuel and deliver it to the ammonia fuel injection module.

[0076] The ammonia fuel injection module is used to receive ammonia fuel and deliver the ammonia fuel to the integrated measurement and control module;

[0077] The integrated measurement and control module is used to conduct a mixing test of the received ammonia fuel with other gases;

[0078] The pipeline cleaning module is used to clean the waste ammonia fuel in the low-pressure gas phase ammonia fuel supply passage and the high-pressure liquid ammonia supply sub-module, and to transport the waste ammonia fuel to the first waste fuel treatment module and the second waste fuel treatment module, respectively.

[0079] Both the first waste fuel processing module and the second waste fuel processing module are used to process the received waste ammonia fuel.

[0080] In practical applications, this implementation method, such as Figure 1 As shown, the low-pressure gaseous ammonia fuel supply path can directly supply ammonia fuel to the ammonia fuel injection module, enabling testing in gaseous or liquid ammonia form. Alternatively, the ammonia fuel can be supplied to the pressurized supply path for pressurization, and then supplied to the ammonia fuel injection module, enabling testing of ammonia fuel at 16 MPa and below, i.e., testing in liquid form. Ammonia fuel can also be supplied to the high-pressure liquid ammonia supply submodule; the high-pressure liquid ammonia supply submodule pressurizes the received ammonia fuel and supplies it to the ammonia fuel injection module, enabling testing of ammonia fuel at 16 MPa-50 MPa. Simultaneously, the integrated monitoring and control module mixes the received ammonia fuel with other gases to complete the test. The pipeline cleaning module cleans the waste ammonia fuel in both the low-pressure gaseous ammonia fuel supply path and the high-pressure liquid ammonia supply submodule, and supplies the waste ammonia fuel to the first and second waste fuel treatment modules for further processing.

[0081] This embodiment provides a wide-pressure-range ammonia fuel supply system for visualization experiments. It employs two modes to supply ammonia fuel to the injector: a low-pressure gas-liquid two-phase ammonia supply submodule and a high-pressure liquid ammonia supply submodule. Alternatively, the low-pressure gas-liquid two-phase ammonia supply submodule and the high-pressure liquid ammonia supply submodule can be integrated separately. Figure 2 and Figure 3As shown, this system enables ammonia fuel testing under different pressures, while separating the ammonia fuel supply process from the ammonia fuel injector injection process, achieving precise pressure control. A pipeline cleaning module is used to clean the waste ammonia fuel in the low-pressure gas-liquid two-phase ammonia supply submodule and the high-pressure liquid ammonia supply submodule, respectively, and then transport them to the first and second waste fuel treatment modules for processing. This allows ammonia fuel to be injected at a predetermined temperature of 300-400K and a pressure of 7-2000 bar. The device has a long service life, is simple to operate, provides process visualization, and offers high safety. It has become an effective experimental tool for research in the field of zero-carbon fuel spray combustion.

[0082] Implementation Method 2. See also Figure 1 This embodiment is an example of the low-pressure gas phase ammonia fuel supply path in the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 1. The low-pressure gas phase ammonia fuel supply path includes an ammonia storage tank 1, a first three-way valve 6, a second electric valve 8, a fourth electric valve 12, a sixth electric valve 16, and a second manual valve 17.

[0083] The ammonia storage tank 1 is equipped with a pressure reducing valve;

[0084] The first three-way valve 6, the second electric valve 8, the fourth electric valve 12, the sixth electric valve 16, and the second manual valve 17 are connected in series on the pressure reducing valve.

[0085] The pressure reducing valve is used to reduce the pressure of ammonia fuel in the ammonia storage tank 1 and to deliver the treated ammonia fuel to the first three-way valve 6.

[0086] The first three-way valve 6 is used to deliver the received ammonia fuel to the second electric valve 8;

[0087] The second electric valve 8 is used to deliver the received ammonia fuel to the fourth electric valve 12, and also to deliver the ammonia fuel to the pressurized supply passage.

[0088] The fourth electric valve 12 is used to deliver the received ammonia fuel to the sixth electric valve 16, and also to deliver the ammonia fuel to the pressurized supply passage.

[0089] The sixth electric valve 16 is used to deliver the received ammonia fuel to the second manual valve 17, and also to deliver the ammonia fuel to the first waste fuel treatment module.

[0090] The second manual valve 17 is used to deliver the received ammonia fuel to the ammonia fuel injection module, and also to deliver ammonia fuel to the high-pressure liquid ammonia supply submodule.

[0091] In practical applications, this implementation method, such as Figure 1As shown, the low-pressure gas phase ammonia fuel supply passage includes an ammonia storage tank 1, a first three-way valve 6, a second electric valve 8, a fourth electric valve 12, a sixth electric valve 16, and a second manual valve 17. The ammonia storage tank 1 is equipped with a pressure reducing valve.

[0092] In application, the low-pressure mode includes both gaseous ammonia and medium-low pressure liquid ammonia. First, liquid ammonia flows out in gaseous or liquid form under the action of the pressure reducing valve, sequentially opening the second electric valve 8, the fourth electric valve 12, the sixth electric valve 16, and the second manual valve 17. Simultaneously, a pressure gauge monitors the pipeline pressure. The gaseous ammonia enters the ammonia fuel injection module, which then injects either gaseous or liquid ammonia into the integrated measurement and control module for testing. After the test, the waste ammonia fuel enters the first waste fuel treatment device, the pipeline is depressurized to atmospheric pressure, and then the pipeline cleaning module purges the gaseous ammonia from the pipeline into the first waste fuel treatment device, completing the cleaning process.

[0093] Implementation Method 3. Participation Figure 1 This embodiment is an example of the pressurization supply path in the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 2. The pressurization supply path includes a hydraulic pump 3, a first manual valve 5, a first pressurization module, and a second pressurization module.

[0094] The first pressurization module includes a second three-way valve 11, a third electric valve 10, and a first piston accumulator 9;

[0095] The second pressurization module includes a third three-way valve 15, a fifth electric valve 14, and a second piston accumulator 13;

[0096] The first manual valve 5 is connected in series at the outlet of the hydraulic pump 3;

[0097] The third electric valve 10 is connected in series at the inlet of the first piston accumulator 9;

[0098] The fifth electric valve 14 is connected in series at the inlet of the second piston accumulator 13;

[0099] The second three-way valve 11 is connected in series with the first manual valve 5 and the third electric valve 10;

[0100] The third three-way valve 15 is connected in series with the second three-way valve 11 and the fifth electric valve 14;

[0101] The hydraulic pump 3 is used to provide hydraulic pressure to the first piston accumulator 9 and the second piston accumulator 13 through the second three-way valve 11 and the third three-way valve 15 respectively.

[0102] The first piston accumulator 9 is used to pressurize the ammonia fuel according to the received liquid pressure and deliver the pressurized ammonia fuel to the low-pressure gas-liquid two-phase ammonia supply submodule.

[0103] The second piston accumulator 13 is used to pressurize the ammonia fuel according to the received liquid pressure and deliver the pressurized ammonia fuel to the low-pressure gas-liquid two-phase ammonia supply submodule.

[0104] In practical applications, this implementation method, such as Figure 1 As shown, to obtain an ammonia fuel pressure of 16 MPa or below, the pressure value of the pressure reducing valve of the ammonia storage tank can be set to allow the ammonia fuel to flow out in liquid form. Based on opening the second electric valve 8, the fourth electric valve 12, and the sixth electric valve 16, the third electric valve 10 and the first manual valve 5 are opened. The first piston accumulator 9 is used alone. The third electric valve 10 is opened to push the moving piston of the first piston accumulator 9 to the top. The fifth electric valve 14 is closed to pressurize the liquid ammonia entering the first piston accumulator 9. When the pipeline pressure reaches the target pressure value, the second manual valve 17 is opened, and the ammonia fuel enters the ammonia fuel injection module.

[0105] To obtain an ammonia fuel pressure of 16MPa-50MPa, the pressure value of the pressure reducing valve of the ammonia storage tank can be set, and the second electric valve 8, the fourth electric valve 12, the sixth electric valve 16, and the second manual valve 17 can be opened to fill the pipeline and the first piston accumulator 9 and the second piston accumulator 13 with liquid ammonia fuel. Then, the fourth electric valve 12 and the second manual valve 17 can be closed, and the third electric valve 10 and the first manual valve 5 can be opened. The first piston accumulator 9 can be used to pressurize the ammonia fuel to 16MPa. Then, the fourth electric valve 12 and the fifth electric valve 14 can be opened, and the second piston accumulator 13 can be used to continue to pressurize the fuel to the target pressure value. Finally, the second manual valve 17 can be opened, and the ammonia fuel can enter the ammonia fuel injection module.

[0106] Implementation Method Four. See also Figure 1 This embodiment is an example of the pipeline cleaning module in the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 3. The pipeline cleaning module includes an air compressor 2, a one-way valve 4, and a first electric valve 7.

[0107] The one-way valve 4 and the first electric valve 7 are connected in series at the outlet of the air compressor 2.

[0108] The first electric valve 7 is connected to the first three-way valve 6;

[0109] The air compressor 2 is used to supply gas to the low-pressure gas phase ammonia fuel supply passage.

[0110] In practical application, after the test, the waste ammonia fuel is introduced into the first waste fuel treatment device. The pipeline is depressurized to atmospheric pressure, and the one-way valve 4 and the first electric valve 7 are opened. The air compressor 2 is used to purge the gaseous ammonia in the pipeline into the first waste fuel treatment device to complete the cleaning. The first piston accumulator 9 and the second piston accumulator 13 will retain pressurized ammonia fuel. The seventh electric valve 18 is opened first to depressurize the pipeline. After the pipeline pressure stabilizes, the pistons of the first piston accumulator 9 and the second piston accumulator 13 are pushed to the top to push the ammonia fuel into the pipeline. Then, the first electric valve 7, the air compressor 2, and the one-way valve 4 are opened to purge the gaseous ammonia in the pipeline into the waste fuel treatment device to complete the cleaning.

[0111] Implementation Method 5. See also Figure 1 This embodiment is an example of the ammonia fuel injection module in the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 4. The ammonia fuel injection module includes a second pneumatic control valve 26 and an ammonia injector 29.

[0112] The ammonia injector 29 is equipped with an ammonia fuel injection valve 19;

[0113] The second pneumatic control valve 26 is connected in series with the ammonia fuel injection valve 19;

[0114] The second pneumatic control valve 26 is connected to the second manual valve 17;

[0115] The ammonia injector 29 is used to inject the received ammonia fuel into the integrated measurement and control module.

[0116] In practical application, ammonia fuel enters the ammonia injector 29 and awaits instructions to be injected into the integrated measurement and control module.

[0117] Implementation method six. See also Figure 1 This embodiment is an example of the high-pressure liquid ammonia supply submodule in the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 5. The high-pressure liquid ammonia supply submodule includes a high-pressure booster 22, a pneumatic booster pump 23, a pressure regulator 25, and a first pneumatic control valve 24.

[0118] The second waste fuel treatment module includes a third pneumatic control valve 27 and a second waste fuel treatment device 30;

[0119] The third pneumatic control valve 27 is connected in series with the second waste fuel treatment device 30;

[0120] The first pneumatic control valve 24 is connected in series at the outlet of the high-pressure booster 22;

[0121] The pneumatic booster pump 23 is used to provide air pressure to the high-pressure booster 22;

[0122] The voltage regulator 25 is used to maintain the pressure inside the high-pressure booster 22;

[0123] The high-pressure booster 22 is used to receive ammonia fuel delivered by the second manual valve 17, and is also used to pressurize the ammonia fuel and deliver it to the ammonia injector 29, and to deliver waste ammonia fuel to the second waste fuel treatment device 30 for treatment.

[0124] In practical applications, this implementation method, such as Figure 1 As shown, when a high-pressure mode is required, 16MPa liquid ammonia needs to be supplied into the high-pressure booster 22 to reset the piston of the high-pressure booster 22. This opens the first pneumatic control valve 24, the second pneumatic control valve 26, and the third pneumatic control valve 27 to purge air from the pipeline, filling the high-pressure liquid ammonia supply pipeline with liquid ammonia. Once the pipeline pressure stabilizes, the second pneumatic control valve 26 and the third pneumatic control valve 27 are closed, and the ammonia fuel in the high-pressure booster 22 is pressurized. By setting the medium pressure of the booster pump 23, after the booster 22 finishes operation, the temperature sensor and pressure sensor read the target ammonia fuel state value, and the second pneumatic control valve 26 is opened. 6. During the injection process of ammonia fuel into the ammonia injector 29, the pressure in the high-pressure chamber of the high-pressure booster 22 will gradually decrease. In order to maintain the stability of the injection pressure, the pressure stabilizer 25 is used to maintain the pressure. After the injection is completed, the fuel pressure in the booster 22 is still relatively high. The pneumatic booster pump 23 is used to relieve part of the pressure, and then the third pneumatic control valve 27 is opened to allow the ammonia fuel to enter the second waste fuel treatment device and be depressurized to atmospheric pressure. At this time, there is residual gaseous ammonia fuel in the pipeline. A certain amount of air is introduced through the low-pressure gas-liquid two-phase ammonia supply submodule to purge the residual gaseous ammonia in the pipeline to the second waste fuel treatment device.

[0125] Implementation Method Seven. See also Figure 1 This embodiment is described by way of example of the first waste fuel treatment module in the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 6. The first waste fuel treatment module includes a seventh electric valve 18 and a first waste fuel treatment device 28.

[0126] The seventh electric valve 18 is connected in series with the first waste fuel treatment device 28;

[0127] The first waste fuel treatment device 28 is used to treat the waste ammonia fuel delivered from the sixth electric valve 16.

[0128] In practical application, the first waste fuel treatment device 28 is used to treat the waste ammonia fuel delivered from the sixth electric valve 16.

[0129] Implementation method eight. See also Figure 1 This embodiment is an example of the integrated measurement and control module in the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 7. The integrated measurement and control module includes an optical diagnostic testing platform 20 and a gas supply system 21.

[0130] The gas supply system 21 is used to provide other gases to the optical diagnostic testing platform 20;

[0131] The optical diagnostic testing platform 20 is used to receive ammonia fuel injected by the ammonia injector 29, and also to conduct mixing tests on the received ammonia fuel with other gases.

[0132] In practical application, this embodiment uses a rapid compression expander (RCEM) to power the optical diagnostic testing platform 20. A preset ratio of nitrogen and oxygen is introduced to simulate the intake state of an internal combustion engine, and ammonia is injected at low pressure. When the piston of the RCEM moves to near the top dead center, the ignition system is controlled to ignite the mixture, forming a low-pressure premixed combustion mode for ammonia combustion testing. Similarly, in the intake state, an appropriate ratio of hydrogen is introduced through the gas supply system to simulate hydrogen-blended ammonia fuel combustion. After the test is completed, the exhaust system is turned on, and the exhaust gas generated in the system is diluted and converted to meet the emission requirements before being discharged into the atmosphere.

[0133] Implementation Method Nine. See also Figure 1 This embodiment is described by adding an ECU control system to the wide pressure range ammonia fuel supply system for visualization testing described in Embodiment 8.

[0134] The ECU control system is used to control the injection quantity of the ammonia fuel injection module.

[0135] Implementation Method 10. See also Figure 2 and Figure 3 This embodiment describes a wide-pressure-range ammonia fuel supply method for visualization tests, which is implemented based on the wide-pressure-range ammonia fuel supply system for visualization tests described in any one of embodiments one to nine.

[0136] In practical applications, this implementation method uses low-voltage mode, such as... Figure 2As shown, a preset ratio of nitrogen and oxygen is introduced into the rapid compression expander (RCEM) to simulate the intake state of an internal combustion engine. Ammonia is injected at low pressure. When the piston of the RCEM moves to near the top dead center, the ignition system is controlled to ignite the mixture, forming a low-pressure premixed combustion mode for ammonia combustion test. Similarly, when the intake state is achieved, an appropriate ratio of hydrogen is introduced through the gas supply system to simulate hydrogen-blended combustion of ammonia fuel.

[0137] After testing, the exhaust system is activated to dilute and convert the waste gas generated within the system to meet emission requirements before releasing it into the atmosphere. Because ammonia is toxic and corrosive, ammonia leak alarms are installed in the ammonia transport pipelines and the testing system installation space to detect leaks. Furthermore, all components inside the ammonia storage tank, solenoid valves, high-pressure pipes, and other equipment that come into contact with ammonia must be ammonia-resistant; materials that are not ammonia-resistant should be avoided. The optical path system performs optical diagnostics of high / low-pressure ammonia fuel spray and combustion through the viewing window of the optical diagnostic testing platform.

[0138] High voltage mode such as Figure 3 As shown. The heating system is turned on to preheat the constant volume bomb body. When the integrated monitoring and control system detects that the internal and external temperatures of the constant volume bomb have reached the set values, the heating is complete. Subsequently, the gas supply system introduces a preset ratio of nitrogen, oxygen, ethylene, and hydrogen into the constant volume bomb body to form a combustible mixture. When the specified temperature and pressure are reached, the ignition system is controlled to ignite the mixture. When the integrated monitoring and control system detects the target values ​​of the temperature and pressure drop, it sends a signal to the ECU unit to complete the high-pressure injection of ammonia fuel. At this time, a high-pressure ammonia combustion test can be performed. Similarly, a cold or hot spray test of high-pressure ammonia can be performed.

[0139] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0140] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0141] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A wide-pressure-range ammonia fuel supply system for visualization testing, characterized in that: The system includes an ammonia fuel supply module, a pipeline cleaning module, a first waste fuel treatment module, a second waste fuel treatment module, and a comprehensive measurement and control module. The ammonia fuel supply module includes a low-pressure gas-liquid two-phase ammonia supply submodule, a high-pressure liquid ammonia supply submodule, and an ammonia fuel injection module. The low-pressure gas-liquid two-phase ammonia supply submodule includes a low-pressure gas-phase ammonia fuel supply passage and a pressurized supply passage. The low-pressure gas phase ammonia fuel supply passage is used to directly supply ammonia fuel to the ammonia fuel injection module, and is also used to supply the ammonia fuel to the pressurization supply passage for pressurization treatment, and to supply the pressurized ammonia fuel to the ammonia fuel injection module, and to supply ammonia fuel to the high-pressure liquid ammonia supply submodule. The high-pressure liquid ammonia supply submodule is used to pressurize the received ammonia fuel and deliver it to the ammonia fuel injection module. The ammonia fuel injection module is used to receive ammonia fuel and deliver the ammonia fuel to the integrated measurement and control module; The integrated measurement and control module is used to conduct a mixing test of the received ammonia fuel with other gases; The pipeline cleaning module is used to clean the waste ammonia fuel in the low-pressure gas phase ammonia fuel supply passage and the high-pressure liquid ammonia supply sub-module, and to transport the waste ammonia fuel to the first waste fuel treatment module and the second waste fuel treatment module, respectively. Both the first waste fuel processing module and the second waste fuel processing module are used to process the received waste ammonia fuel.

2. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 1, characterized in that, The low-pressure gas phase ammonia fuel supply passage includes an ammonia storage tank (1), a first three-way valve (6), a second electric valve (8), a fourth electric valve (12), a sixth electric valve (16), and a second manual valve (17). The ammonia storage tank (1) is equipped with a pressure reducing valve; The first three-way valve (6), the second electric valve (8), the fourth electric valve (12), the sixth electric valve (16), and the second manual valve (17) are connected in series on the pressure reducing valve. The pressure reducing valve is used to reduce the pressure of ammonia fuel in the ammonia storage tank (1) and to deliver the treated ammonia fuel to the first three-way valve (6); The first three-way valve (6) is used to deliver the received ammonia fuel to the second electric valve (8); The second electric valve (8) is used to deliver the received ammonia fuel to the fourth electric valve (12) and also to deliver the ammonia fuel to the pressurized supply passage; The fourth electric valve (12) is used to deliver the received ammonia fuel to the sixth electric valve (16) and also to deliver the ammonia fuel to the pressurized supply passage. The sixth electric valve (16) is used to deliver the received ammonia fuel to the second manual valve (17) and also to deliver the ammonia fuel to the first waste fuel treatment module; The second manual valve (17) is used to deliver the received ammonia fuel to the ammonia fuel injection module and also to deliver ammonia fuel to the high-pressure liquid ammonia supply submodule.

3. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 2, characterized in that, The pressurization supply channel includes a hydraulic pump (3), a first manual valve (5), a first pressurization module, and a second pressurization module; The first pressurization module includes a second three-way valve (11), a third electric valve (10), and a first piston accumulator (9); The second pressurization module includes a third three-way valve (15), a fifth electric valve (14), and a second piston accumulator (13); The first manual valve (5) is connected in series at the outlet of the hydraulic pump (3); The third electric valve (10) is connected in series at the inlet of the first piston accumulator (9); The fifth electric valve (14) is connected in series at the inlet of the second piston accumulator (13); The second three-way valve (11) is connected in series with the first manual valve (5) and the third electric valve (10); The third three-way valve (15) is connected in series with the second three-way valve (11) and the fifth electric valve (14); The hydraulic pump (3) is used to provide hydraulic pressure to the first piston accumulator (9) and the second piston accumulator (13) through the second three-way valve (11) and the third three-way valve (15), respectively. The first piston accumulator (9) is used to pressurize the ammonia fuel according to the received liquid pressure and deliver the pressurized ammonia fuel to the low-pressure gas-liquid two-phase ammonia supply submodule. The second piston accumulator (13) is used to pressurize the ammonia fuel according to the received liquid pressure and deliver the pressurized ammonia fuel to the low-pressure gas-liquid two-phase ammonia supply submodule.

4. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 3, characterized in that, The pipeline cleaning module includes an air compressor (2), a one-way valve (4), and a first electric valve (7); The one-way valve (4) and the first electric valve (7) are connected in series at the outlet of the air compressor (2); The first electric valve (7) is connected to the first three-way valve (6); The air compressor (2) is used to deliver gas to the low-pressure gas phase ammonia fuel supply passage.

5. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 4, characterized in that, The ammonia fuel injection module includes a second pneumatic control valve (26) and an ammonia injector (29); The ammonia injector (29) is equipped with an ammonia fuel injection valve (19); The second pneumatic control valve (26) is connected in series with the ammonia fuel injection valve (19); The second pneumatic control valve (26) is connected to the second manual valve (17); The ammonia injector (29) is used to inject the received ammonia fuel into the integrated measurement and control module.

6. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 5, characterized in that, The high-pressure liquid ammonia supply submodule includes a high-pressure booster (22), a pneumatic booster pump (23), a pressure regulator (25), and a first pneumatic control valve (24); The second waste fuel treatment module includes a third pneumatic control valve (27) and a second waste fuel treatment device (30); The third pneumatic control valve (27) is connected in series with the second waste fuel treatment device (30); The first pneumatic control valve (24) is connected in series at the outlet of the high-pressure booster (22); The pneumatic booster pump (23) is used to provide air pressure to the high-pressure booster (22); The voltage regulator (25) is used to maintain the pressure inside the high-pressure booster (22); The high-pressure booster (22) is used to receive ammonia fuel delivered by the second manual valve (17), and is also used to pressurize the ammonia fuel and deliver it to the ammonia injector (29), and to deliver waste ammonia fuel to the second waste fuel treatment device (30) for treatment.

7. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 6, characterized in that, The first waste fuel treatment module includes a seventh electric valve (18) and a first waste fuel treatment device (28); The seventh electric valve (18) is connected in series with the first waste fuel treatment device (28); The first waste fuel treatment device (28) is used to treat the waste ammonia fuel delivered from the sixth electric valve (16).

8. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 7, characterized in that, The integrated measurement and control module includes an optical diagnostic testing platform (20) and a gas supply system (21); The gas supply system (21) is used to supply other gases to the optical diagnostic testing platform (20); The optical diagnostic test platform (20) is used to receive ammonia fuel injected by the ammonia injector (29) and to conduct a mixing test of the received ammonia fuel with other gases.

9. The wide-pressure-range ammonia fuel supply system for visual testing according to claim 8, characterized in that, The system also includes an ECU control system; The ECU control system is used to control the injection quantity of the ammonia fuel injection module.

10. A wide-pressure-range ammonia fuel supply method for visualization testing, characterized in that: The method is based on the wide pressure range ammonia fuel supply system for visualization testing as described in any one of claims 1-9.

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