Ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled marine low-speed engines

Abstract

The present invention discloses a simulation platform for detecting ammonia leakage and exhaust gas from an ammonia-fueled marine low-speed engine. The platform comprises a pressure vessel, a gas injection unit, a temperature regulation unit, a pressure regulation unit, an oil mist injection unit, and a detection unit. The gas injection unit is connected to the pressure vessel to inject a target gas into the pressure vessel; the temperature regulation unit is connected to the pressure vessel to inject hot air into the pressure vessel; the pressure regulation unit is connected to the pressure vessel to regulate the air pressure within the pressure vessel; the oil mist injection unit is connected to the pressure vessel to inject oil mist into the pressure vessel; and the detection unit is connected to the pressure vessel to detect the target gas in the mixed gas within the pressure vessel. Compared with existing technologies, this platform can mix ammonia leakage gas and exhaust gas containing unconventional emissions under different operating conditions of the low-speed engine within the pressure vessel, and detect them using the detection unit, thereby verifying the detection function and detection accuracy of the detection unit under different operating conditions of the low-speed engine.

Description

Technical Field

[0001] The present invention relates to the field of ammonia fuel ships, and in particular to an ammonia leakage and exhaust gas detection simulation platform for low-speed engines of ammonia fuel ships. Background Art

[0002] Ammonia is a classic chemical product and a typical carbon-free fuel. Gaseous ammonia can be liquefied at room temperature at approximately 7 to 8 atmospheres of pressure. A relatively well-established global infrastructure for ammonia production, storage, and transportation is also in place. Furthermore, ammonia's high octane rating and excellent anti-knock properties facilitate its widespread use as a fuel. Despite these advantages, ammonia leaks are a serious industrial accident in practice, posing significant health risks. Ammonia has a strong odor and can irritate the eyes and respiratory tract, causing tearing, redness, swelling, coughing, and difficulty breathing. Contact with skin or mucous membranes can cause burns, redness, swelling, or ulcers. Inhalation of high concentrations can cause headaches, dizziness, nausea, vomiting, and coma. Long-term exposure to low concentrations can impair lung function and increase the risk of chronic respiratory diseases.

[0003] Ammonia-fueled low-speed marine engines are currently in the R&D and testing phase. A system for detecting ammonia leaks and unconventional exhaust emissions suitable for these engines is also being developed simultaneously. To verify and evaluate the functionality and accuracy of these systems, a dedicated test bench is required that can simulate ammonia leak scenarios and unconventional emissions. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled low-speed marine engines, so as to solve the technical problem that the existing technology lacks a platform that can simulate ammonia leakage and unconventional emissions of ammonia-fueled low-speed marine engines, so as to verify and evaluate the functions and accuracy of the ammonia leakage detection system and the exhaust gas unconventional emission detection system.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] The present invention provides an ammonia leakage and exhaust gas detection simulation platform for an ammonia-fueled marine low-speed engine, comprising: a pressure vessel; a gas injection unit, the gas injection unit being connected to the pressure vessel to inject a target gas into the pressure vessel; a temperature regulating unit, the temperature regulating unit being connected to the pressure vessel to inject hot air into the pressure vessel; a pressure regulating unit, the pressure regulating unit being connected to the pressure vessel to regulate the air pressure in the pressure vessel; an oil mist injection unit, the oil mist injection unit being connected to the pressure vessel to inject oil mist into the pressure vessel; and a detection unit, the detection unit being connected to the pressure vessel to detect the target gas in the mixed gas in the pressure vessel.

[0007] In some embodiments, the gas injection unit includes a gas supply module, a first pressure reducing valve, a first flow meter and a first pipeline. The gas supply module is connected to the pressure vessel through the first pipeline. The first pressure reducing valve and the first flow meter are arranged on the first pipeline for adjusting the flow rate of the target gas.

[0008] In some embodiments, the gas injection unit further includes a fiber grating sensor and / or an electrochemical sensor, and the fiber grating sensor and / or the electrochemical sensor are disposed on the first pipeline to detect whether the target gas is leaking.

[0009] In some embodiments, the temperature regulating unit includes an air compressor, a second pipe, and an air heater. The air compressor is connected to the pressure container through the second pipe. The air heater is arranged on the second pipe to heat the air.

[0010] In some embodiments, the temperature regulating unit also includes an air cylinder, a second pressure reducing valve and a second flow meter. The air compressor is connected to the air cylinder, and the air cylinder is connected to the pressure vessel through a second pipe. The second pressure reducing valve and the second flow meter are arranged on the second pipe for measuring and adjusting the flow of air.

[0011] In some embodiments, the temperature regulating unit further includes a temperature sensor and a temperature controller. The temperature sensor is disposed in the pressure vessel, and the temperature sensor is connected to the air heater signal control via the temperature controller.

[0012] In some embodiments, the temperature regulating unit further includes a filter, which is disposed on the second pipe to filter particulate matter in the air.

[0013] In some embodiments, the pressure regulating unit includes a third pipe, a pressure regulating valve and a pressure sensor. One end of the third pipe is connected to the pressure container, and the other end forms an air vent. The pressure regulating valve is arranged on the third pipe, and the pressure sensor is arranged in the pressure container and is connected to the pressure regulating valve signal control.

[0014] In some embodiments, the oil mist injection unit includes an oil supply module, a compressed air supply module, an oil mist collector and a fourth pipe. The compressed air supply module is connected to the pressure vessel through the fourth pipe. The oil mist collector is arranged on the fourth pipe and connected to the oil supply module. The oil mist collector can atomize the oil into oil mist and mix it with the compressed air and transport it into the pressure vessel.

[0015] In some embodiments, the detection unit includes an ammonia leak pretreatment device and detection system and an exhaust gas pretreatment device and detection system.

[0016] Compared with the existing technology, the ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled marine low-speed engines provided by the present invention can mix ammonia leakage gas and exhaust gas containing unconventional emissions under different operating conditions of the low-speed engine in a pressure vessel, and use the detection unit to detect them, thereby verifying the detection function and detection accuracy of the detection unit under different operating conditions of the low-speed engine, thereby providing data support for improving the detection accuracy of the detection unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of an ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled marine low-speed engines provided by an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the local structure of the first pipeline. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In order to solve the technical problem of the lack of a platform capable of simulating ammonia leakage and unconventional emissions from ammonia-fueled marine low-speed engines, so as to verify and evaluate the functions and accuracy of ammonia leakage detection systems and exhaust gas unconventional emissions detection systems, the present invention provides an ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled marine low-speed engines (hereinafter referred to as low-speed engines). The platform can mix ammonia leakage gas and exhaust gas containing unconventional emissions under different operating conditions of the low-speed engine in a pressure vessel, and use a detection unit to detect them, thereby verifying the detection function and detection accuracy of the detection unit under different operating conditions of the low-speed engine, thereby providing data support for improving the detection accuracy of the detection unit.

[0021] It should be noted that the ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled marine low-speed engines described in the present invention is used for but not limited to simulating the gas generated when ammonia leaks from ammonia-fueled marine low-speed engines. For the sake of convenience, in the present invention, only the ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled marine low-speed engines is used to simulate the gas generated when ammonia leaks from ammonia-fueled marine low-speed engines as an example for explanation. The principle of simulating other gases by the ammonia leakage and exhaust gas detection simulation platform for ammonia-fueled marine low-speed engines is essentially the same as the principle of simulating the gas generated when ammonia leaks, and they will not be elaborated here.

[0022] See also Figure 1 , Figure 1This is a structural schematic diagram of an ammonia leakage and exhaust gas detection simulation platform for an ammonia-fueled marine low-speed engine in one embodiment of the present invention. The ammonia leakage and exhaust gas detection simulation platform for an ammonia-fueled marine low-speed engine includes a pressure vessel 1, a gas injection unit 2, a temperature adjustment unit 3, a pressure adjustment unit 4, an oil mist injection unit 5 and a detection unit 6.

[0023] Pressure vessel 1 is used to store gases simulating ammonia leaks or exhaust containing unconventional emissions. To simulate the actual operating conditions of a marine low-speed engine, pressure vessel 1 must be able to withstand certain temperatures and pressures. It is also preferably equipped with a safety valve 11. If the internal pressure of pressure vessel 1 rises abnormally, pressure relief valve 11 can be used to prevent accidents.

[0024] The gas injection unit 2 is connected to the pressure vessel 1 to inject target gas, ie, ammonia or tail gas containing unconventional emissions, into the pressure vessel 1 .

[0025] The temperature regulating unit 3 is communicated with the pressure vessel 1 to inject hot air into the pressure vessel 1 so that the temperature and pressure of the mixed gas in the pressure vessel 1 meet the requirements.

[0026] The pressure regulating unit 4 is in communication with the pressure container 1 to regulate the gas pressure in the pressure container 1 .

[0027] The oil mist injection unit 5 is in communication with the pressure vessel 1 to inject oil mist into the pressure vessel 1 , thereby simulating the oil mist environment in the scavenging box or the crankcase.

[0028] Detection unit 6 is connected to pressure vessel 1. The mixed gas in pressure vessel 1 can be transported to detection unit 6, which detects the target gas therein. Since the actual content of the target gas is known, the detection value of detection unit 6 reflects the detection accuracy of detection unit 6.

[0029] In some embodiments, the gas injection unit 2 includes a gas supply module 21, a first pressure reducing valve 22, a first flowmeter 23, and a first pipeline 24. The gas supply module 21 is connected to the pressure vessel 1 via the first pipeline 24, and the first pressure reducing valve 22 and the first flowmeter 23 are arranged on the first pipeline 24. The gas supply module 21 can use a gas tank or a gas supply pipeline to supply ammonia (liquid ammonia) and unconventional emissions. The first pressure reducing valve 22 is used to reduce the pressure of the target gas to an appropriate level, and the first flowmeter 23 is used to measure and adjust the flow rate of the target gas so that the target gas is quantitatively added to the pressure vessel 1. Since it is necessary to simulate ammonia leakage and tail gas containing unconventional emissions, two sets of gas injection units can be used to inject ammonia and unconventional emissions respectively, and connected by a three-way valve, sharing some pipelines to reduce costs.

[0030] See Figure 2In a preferred embodiment, a fiber grating sensor 25 and / or an electrochemical sensor 26 may be provided in section A of the first pipe 24. The fiber grating sensor 25 and / or the electrochemical sensor 26 are used to detect whether the target gas is leaking.

[0031] In some embodiments, the temperature adjustment unit 3 includes an air compressor 31, a second pipe 32, and an air heater 33. The air compressor 31 is connected to the pressure vessel 1 through the second pipe 32. The air heater 33 is disposed on the second pipe 32 to heat the air. The air compressor 31 drives air into the pressure vessel 1. As the air flows through the second pipe 32, it is heated by the air heater 33. The air enters the pressure vessel 1 and increases the temperature and pressure within the pressure vessel 1.

[0032] In some embodiments, the temperature regulating unit 3 further includes an air cylinder 34, a second pressure reducing valve 35 and a second flow meter 36. The air compressor 31 is connected to the air cylinder 34, and the air cylinder 34 is connected to the pressure vessel 1 through the second pipe 32. The second pressure reducing valve 35 and the second flow meter 36 are arranged on the second pipe 32. When conducting experiments, in order to meet the input rate requirements of hot air, very high performance requirements are placed on the air compressor 31. In order to reduce costs, an air cylinder 34 can be set, and the air compressor 31 compresses the air and stores it in the air cylinder 34 in advance, and then uses the air cylinder 34 to provide compressed air when conducting experiments. This not only ensures the hot air input rate, but also reduces the equipment cost. The second pressure reducing valve 35 is used to reduce the pressure of the compressed air to an appropriate size, and the second flow meter 36 is used to measure and adjust the input flow of the air.

[0033] In some embodiments, the temperature regulating unit 3 further includes a temperature sensor 37 and a temperature controller 38. The temperature sensor 37 is disposed in the pressure vessel 1 and is used to measure the temperature in the pressure vessel 1. The temperature sensor 37 is connected to the air heater 33 through the temperature controller 38 for signal control. When the temperature in the pressure vessel 1 reaches the required level, the air heater 33 is controlled to stop heating.

[0034] In some embodiments, the temperature regulating unit 3 further includes a filter 39 , which is disposed on the second pipe 32 to filter particulate matter in the air.

[0035] In some embodiments, the pressure regulating unit 4 includes a third pipe 41, a pressure regulating valve 42, and a pressure sensor 43. One end of the third pipe 41 is connected to the pressure vessel 1, and the other end forms a vent. The pressure regulating valve 42 is disposed on the third pipe 41, and the pressure sensor 43 is disposed within the pressure vessel 1 and is connected to the pressure regulating valve 42 for signal control. The temperature regulating unit 3 increases the pressure of the gas within the pressure vessel 1 while simultaneously increasing the temperature. When the pressure sensor 43 detects that the pressure within the pressure vessel 1 is too high, it controls the pressure regulating valve 42 to open, releasing pressure through the third pipe 41, reducing the pressure to an appropriate level.

[0036] In some embodiments, the oil mist injection unit 5 includes an oil supply module 51, a compressed air supply module 52, an oil mist collector 53, and a fourth pipe 54. The compressed air supply module 52 is connected to the pressure vessel 1 via the fourth pipe 54. The compressed air supply module 52 can share the air compressor 31 of the temperature control unit 3 or a combination of the air compressor 31 and the air cylinder 34. Alternatively, a separate air supply device similar to the air compressor 31 and the air cylinder 34 can be provided, as long as a stable air supply can be achieved. The oil mist collector 53 is provided on the fourth pipe 54 and connected to the oil supply module 51. The oil supply module 51 is used to deliver lubricating oil to the oil mist collector 53. After being atomized by the oil mist collector 53, the lubricating oil mist is formed, mixed with the compressed air in the fourth pipe 54, and delivered to the pressure vessel 1. The oil mist collector 53 can be a Venturi tube or other atomizer.

[0037] In some embodiments, the detection unit 6 includes an ammonia leak pre-treatment device and detection system 61 and an exhaust gas pre-treatment device and detection system 62. The ammonia leak pre-treatment device and detection system 61 is used to detect ammonia leaks, and the exhaust gas pre-treatment device and detection system 62 is used to detect unconventional emissions in the exhaust gas.

[0038] In order to better understand the present invention, the following Figure 1The technical solution of the present invention is described in detail: Ammonia gas (liquid ammonia) is quantitatively injected into the pressure vessel 1 via the gas injection unit 2. High-temperature air is introduced into the pressure vessel 1 via the temperature adjustment unit 3. The gas within the pressure vessel 1 is brought to the desired temperature. The pressure within the pressure vessel 1 is adjusted to the desired level via the pressure adjustment unit 4. Lubricating oil mist is introduced into the pressure vessel 1 via the oil mist injection unit 5. Through these steps, a gas is generated within the pressure vessel 1 that simulates the ammonia leak of a marine low-speed engine under certain operating conditions, and the ammonia content in this gas is known. This gas is then introduced into the detection unit 6 for detection. The detection result of the detection unit 6 is compared with the actual ammonia content to determine the detection accuracy of the detection unit 6 under these operating conditions. The test is then repeated with different operating conditions, i.e., with different temperature, pressure, lubricating oil content, ammonia content, and other data, to determine the detection accuracy of the detection unit 6 under other operating conditions.

[0039] The operation method for simulating exhaust gas containing unconventional emissions is the same as that for simulating ammonia leaks, except that ammonia (liquid ammonia) is replaced with unconventional emissions, and the test data is then changed accordingly.

[0040] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines, characterized in that: include: pressure vessels; a gas injection unit, the gas injection unit being connected to the pressure vessel to inject a target gas into the pressure vessel; a temperature regulating unit, the temperature regulating unit being in communication with the pressure vessel for injecting hot air into the pressure vessel; a pressure regulating unit, the pressure regulating unit being in communication with the pressure vessel to regulate the gas pressure in the pressure vessel; an oil mist injection unit, the oil mist injection unit being in communication with the pressure vessel for injecting oil mist into the pressure vessel; A detection unit is communicated with the pressure container to detect the target gas in the mixed gas in the pressure container.

2. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 1 is characterized in that: The gas injection unit includes a gas supply module, a first pressure reducing valve, a first flow meter and a first pipeline. The gas supply module is connected to the pressure vessel through the first pipeline. The first pressure reducing valve and the first flow meter are arranged on the first pipeline for measuring and adjusting the flow of the target gas.

3. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 2 is characterized in that: The gas injection unit further includes a fiber grating sensor and / or an electrochemical sensor, and the fiber grating sensor and / or the electrochemical sensor are arranged on the first pipeline to detect whether the target gas is leaking.

4. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 1 is characterized in that: The temperature regulating unit includes an air compressor, a second pipe and an air heater. The air compressor is connected to the pressure container through the second pipe. The air heater is arranged on the second pipe to heat air.

5. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 4 is characterized in that: The temperature regulating unit also includes an air cylinder, a second pressure reducing valve and a second flow meter. The air compressor is connected to the air cylinder, and the air cylinder is connected to the pressure vessel through the second pipe. The second pressure reducing valve and the second flow meter are arranged on the second pipe for measuring and adjusting the flow of air.

6. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 4 is characterized in that: The temperature regulating unit further comprises a temperature sensor and a temperature controller. The temperature sensor is arranged in the pressure vessel, and the temperature sensor is connected to the air heater through the temperature controller for signal control.

7. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 4 is characterized in that: The temperature regulating unit further includes a filter, which is arranged on the second pipe to filter particulate matter in the air.

8. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 1 is characterized in that: The pressure regulating unit includes a third pipeline, a pressure regulating valve and a pressure sensor. One end of the third pipeline is connected to the pressure container, and the other end forms an air vent. The pressure regulating valve is arranged on the third pipeline. The pressure sensor is arranged in the pressure container and is connected to the pressure regulating valve signal control.

9. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 1 is characterized in that: The oil mist injection unit includes an oil supply module, a compressed air supply module, an oil mist eliminator and a fourth pipeline. The compressed air supply module is connected to the pressure vessel through the fourth pipeline. The oil mist eliminator is arranged on the fourth pipeline and connected to the oil supply module. The oil mist eliminator can atomize the oil into oil mist and mix it with compressed air, and then transport it into the pressure vessel.

10. The ammonia leakage and exhaust gas detection simulation platform for ammonia fueled marine low-speed engines according to claim 1 is characterized in that: The detection unit includes an ammonia leakage pretreatment device and a detection system and an exhaust gas pretreatment device and a detection system.

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