Marine NH3 automatic collection and detection device

Abstract

The invention discloses an automatic NH3 collecting and detecting device for a ship, and relates to the field of NH3 engines. The device comprises a sampling and collecting assembly, a detection chamber, a detection signal transmitting unit, a detection signal receiving unit and a control processing unit, the sampling and collecting assembly is connected with the detection chamber, and the sampling and collecting assembly is arranged on the periphery of an NH3 vaporizer of the marine NH3 engine and used for driving detected gas on the periphery of the NH3 vaporizer to enter the detection chamber; the detection signal transmitting unit and the detection signal receiving unit are oppositely arranged and are respectively positioned on two sides of the detection chamber; the detection signal emission unit is used for emitting a detection light signal with a preset wavelength, so that the detection light signal passes through the detected gas in the detection chamber; the detection signal receiving unit is used for receiving the detection light signal and generating an electric induction signal; and the control processing unit is used for determining the NH3 concentration of the detected gas according to the electric induction signal. According to the invention, whether NH3 leaks or not can be accurately detected, and normal operation of the marine NH3 engine and personnel safety are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of marine NH 3 engines, and particularly to an automatic collection and detection device for marine NH 3 engines. Background Art

[0002] NH 3 engine is an internal combustion engine fueled by ammonia (NH 3 ), which has the characteristics of low carbon emissions and utilization of renewable energy. It generates power by burning ammonia gas in the engine cylinder. During the combustion process, nitrogen and water are mainly produced, and almost no carbon dioxide is generated, which is in line with the global trend of low-carbon development. Ammonia fuel can be produced from renewable energy and is sustainable.

[0003] Therefore, NH 3 engines have positive application prospects in marine power, and can provide a low-carbon and sustainable energy solution for the shipping industry. By using ammonia as fuel, NH 3 engines can significantly reduce the carbon dioxide emissions of ships and help achieve the decarbonization goal of the shipping industry.

[0004] In an NH 3 engine, the NH 3 vaporizer is a key component, and its main function is to convert liquid ammonia fuel into gas for combustion in the engine. The NH 3 vaporizer vaporizes liquid ammonia by heating it and transports the gaseous ammonia to the combustion chamber of the engine.

[0005] However, due to the long-term operation of the NH 3 vaporizer in high-temperature and high-pressure environments, and NH 3 having strong corrosiveness, the NH 3 vaporizer will inevitably experience situations such as seal aging, material corrosion, or poor connection, resulting in the leakage of gaseous NH 3 from the vaporizer, affecting the normal operation of the NH 3 engine and posing a threat to the safety of the ship's crew.

[0006] Therefore, how to accurately detect whether NH 3 is leaking and ensure the normal operation of the marine NH 3 engine and the safety of personnel is an urgent problem to be solved. Summary of the Invention

[0007] Aiming at the above technical problems and defects, the purpose of the present invention is to provide an automatic collection and detection device for marine NH 3 engines, which can accurately detect NH 3Whether there is leakage to ensure the normal operation of the marine NH 3 engine and the safety of personnel.

[0008] To achieve the above object, the present invention provides a marine NH 3 automatic collection and detection device, including a sampling and collection component, a detection chamber, a detection signal transmitting unit, a detection signal receiving unit, and a control and processing unit; the control and processing unit is respectively connected to the sampling and collection component, the detection signal transmitting unit, and the detection signal receiving unit; the sampling and collection component is connected to the detection chamber, and the sampling and collection component is arranged around the NH 3 carburetor of the marine NH 3 engine, and is used to drive the measured gas around the NH 3 carburetor into the detection chamber according to the sampling instruction of the control and processing unit; the detection signal transmitting unit and the detection signal receiving unit are arranged opposite to each other and are respectively located on both sides of the detection chamber; the detection signal transmitting unit is used to emit a detection optical signal with a preset wavelength according to the detection instruction of the control and processing unit, so that the detection optical signal passes through the measured gas in the detection chamber and is directed to the detection signal receiving unit; the detection signal receiving unit is used to receive the detection optical signal and generate an electrical induction signal; the control and processing unit is used to determine the NH 3 concentration of the measured gas according to the electrical induction signal.

[0009] The present invention integrates key components such as a sampling and collection component, a detection chamber, a detection signal transmitting and receiving unit, and a control and processing unit, and realizes the efficient and accurate detection of the NH 3 concentration around the NH 3 carburetor. The sampling and collection component actively collects the measured gas to ensure the timeliness and representativeness of the detection; the detection signal transmitting and receiving unit uses an optical signal with a specific wavelength to pass through the gas in the detection chamber and generates an electrical induction signal related to the NH 3 concentration, providing accurate data for subsequent processing. The control and processing unit processes the signals from the sensor, calculates the NH 3 concentration, and judges whether there is NH 3 leakage in the NH 3 carburetor. The whole device has a high degree of automation, is easy to operate, has strong adaptability, can operate stably in a complex marine environment, and can accurately detect NH 3 leakage to ensure the normal operation of the marine NH 3 engine and the safety of personnel.

[0010] In some embodiments, the sampling and collection component includes a vacuum pump and an intake pipe. The intake port of the intake pipe is located around the NH 3 carburetor. The intake pipe is connected to the detection chamber, and the vacuum pump is arranged on the intake pipe to generate negative pressure in the intake pipe.

[0011] Adopting the technical solution of the above embodiment, by integrating a vacuum pump and an intake pipe in the sampling and collection component, the device can actively and efficiently collect NH 3 the measured gas around the vaporizer. The vacuum pump is arranged on the intake pipe to generate negative pressure, overcoming the limitation of relying solely on the natural diffusion of gas, and improving the sampling efficiency and speed. The intake port of the intake pipe is located around the NH 3 vaporizer, ensuring the accuracy and representativeness of sampling, and being able to promptly capture possible NH 3 leakage. In addition, this design also reduces the interference of the external environmental air and avoids the mixing of other irrelevant gases, providing a pure and reliable gas sample for the subsequent NH 3 concentration detection, thereby improving the accuracy and reliability of the detection results and providing a strong guarantee for the safe operation of the marine NH 3 engine.

[0012] In some embodiments, the sampling and collection component further includes a salt spray filtration unit, which is arranged at the intake port and used to filter the salt spray in the marine environment.

[0013] Adopting the technical solution of the above embodiment, adding a salt spray filtration unit to the sampling and collection component effectively addresses the complex marine environment. The salt spray filtration unit is arranged at the intake port and becomes the first line of defense for gas to enter the sampling system. In the marine environment, salt spray is diffused, and if salt particles enter the detection system along with the gas, they will block the pipeline, contaminate the components, and interfere with the detection. The salt spray filtration unit uses high-efficiency filtration materials to accurately intercept salt particles, allowing the gas to pass through smoothly while keeping the salt out. This effectively prevents the adverse effects of salt spray on the detection process, avoids the corrosion and damage of the equipment, extends the service life of the equipment, ensures the stability and accuracy of the detection results, enables the device to operate stably in the marine environment for a long time, and provides a reliable guarantee for the monitoring of the marine NH 3 engine.

[0014] In some embodiments, the device further includes a barometric pressure sensor, which is arranged in the detection chamber and used to detect the barometric pressure in the detection chamber. The barometric pressure sensor is connected to the control and processing unit, and the control and processing unit is connected to the vacuum pump.

[0015] Adopting the technical solution of the above embodiment, introducing a barometric pressure sensor and arranging it in the detection chamber adds an important environmental monitoring function to the detection process. The barometric pressure sensor can detect the barometric pressure in the detection chamber in real time and accurately, and transmit the barometric pressure data to the control and processing unit. The control and processing unit intelligently adjusts the working state of the vacuum pump according to the barometric pressure information, such as adjusting the pumping rate or starting and stopping the vacuum pump, so as to precisely control the barometric pressure in the detection chamber and keep it within the optimal detection range. This dynamic adjustment mechanism effectively avoids the influence of barometric pressure fluctuations on NH 3The influence of concentration detection is improved, enhancing the stability and accuracy of detection. Meanwhile, the addition of the barometric pressure sensor also enhances the environmental adaptability of the device, enabling it to operate stably under different barometric pressure conditions, providing strong support for the reliable monitoring of marine NH 3 engines.

[0016] In some embodiments, the device further includes a temperature sensor for detecting temperature information and a humidity sensor for detecting humidity information. Both the temperature sensor and the humidity sensor are disposed around the NH 3 vaporizer and are both connected to the control and processing unit. The control and processing unit is further configured to compensate for the NH 3 concentration of the gas to be measured according to the temperature information and the humidity information.

[0017] Adopting the technical solution of the above embodiment, equipping with a temperature sensor and a humidity sensor and disposing them around the NH 3 vaporizer can accurately obtain temperature and humidity information. These two environmental factors have a significant impact on the vaporization efficiency of NH 3 and the properties of the gas to be measured. The control and processing unit compensates for the NH 3 concentration according to this information, effectively eliminating the detection errors caused by temperature and humidity changes. For example, an increase in temperature will accelerate the movement of NH 3 molecules, and an increase in humidity will affect the absorption characteristics of NH 3 molecules. The compensation algorithm can adjust the processing parameters of the detection signal according to the actual temperature and humidity conditions, making the detection result closer to the true value. This compensation mechanism significantly improves the accuracy and reliability of detection, ensuring that the device can provide accurate NH 3 concentration data under different environmental conditions, providing strong guarantee for the safe operation and performance monitoring of marine NH 3 engines.

[0018] In some embodiments, the control and processing unit is further configured to obtain the acceleration information of the ship and compensate for the NH 3 concentration of the gas to be measured according to the acceleration information, the temperature information and the humidity information.

[0019] Adopting the technical solution of the above embodiment enables the device to more comprehensively cope with complex navigation environments. During the navigation of the ship, changes in acceleration will cause changes in the air flow velocity and distribution in the detection chamber, thereby affecting the interaction between NH 3 molecules and the detection optical signal, resulting in detection errors. By introducing the acceleration information, the control and processing unit can accurately evaluate the influence of acceleration on the detection process, and combine the temperature and humidity data to apply a comprehensive compensation algorithm to the NH 3The concentration is accurately calibrated. This compensation method that integrates multiple factors effectively improves the stability and accuracy of the detection results, ensuring that the device can provide reliable NH 3 concentration data under various navigation conditions, providing a more solid guarantee for the safe operation of marine NH 3 engines.

[0020] In some embodiments, the control processing unit is specifically configured to input acceleration information, temperature information, and humidity information into a preset multi-source data fusion compensation model to obtain a compensation factor, and based on the compensation factor, compensate for the NH 3 concentration of the measured gas.

[0021] By adopting the technical solution of the above embodiment, intelligent compensation for NH 3 concentration detection is achieved. This model is a complex algorithm model that comprehensively considers the influence of various environmental factors. Through advanced algorithms such as deep learning and neural networks, information from different data sources is fused and processed to discover the correlation law between each factor and the NH 3 concentration detection error. The compensation factor output by the model is a value that comprehensively reflects the influence of acceleration, temperature, and humidity, indicating the degree to which the NH 3 concentration detection result needs to be adjusted under the current environmental conditions. Based on the correction of the compensation factor, the comprehensive error caused by environmental factors can be eliminated, making the detection result more accurate. This process not only improves the detection accuracy but also enhances the adaptability of the device in complex marine environments, providing strong technical support for the stable operation and performance monitoring of marine NH 3 engines.

[0022] In some embodiments, the control processing unit is further configured to control the sampling frequency of the sampling collection component and the signal emission frequency of the detection signal emission unit according to the operating state of the marine NH 3 engine.

[0023] By adopting the technical solution of the above embodiment, dynamic optimization of the detection process is achieved. When the NH 3 engine is operating at high load, the consumption and emission of NH 3 are relatively large. The control processing unit will increase the sampling frequency and signal emission frequency, enabling the device to collect gas samples and obtain detection data more frequently, and promptly capturing possible NH 3 leakage situations to ensure the sensitivity and timeliness of detection. When the engine is operating at low load or in a shutdown state, the control processing unit reduces the sampling frequency and signal emission frequency to reduce energy consumption and extend the service life of the equipment, while ensuring the economy and rationality of detection. This intelligent control strategy enables the device to adapt to the NH 3The operating states of the engine are closely coordinated to improve the detection efficiency and accuracy, providing a strong guarantee for the safe and efficient operation of the engine.

[0024] In some embodiments, the device further includes a display screen, which is connected to the control processing unit and is used to display the detection results of the gas to be detected.

[0025] Adopting the technical solution of the above embodiment provides an intuitive and convenient result display function for the device. The control processing unit transmits the detected NH 3 concentration data to the display screen, which is clearly presented in the form of numbers, charts or graphs. The high-resolution and high-contrast display screen ensures that the detection results can be accurately displayed under various lighting conditions. The real-time displayed NH 3 concentration value enables the operator to clearly understand the current NH 3 concentration level at a glance; the trend chart shows the change of NH 3 concentration over time, providing a visual basis for analyzing the operating state of the engine and the performance of the carburetor. When the detected NH 3 concentration is abnormal, the display screen can also remind the operator in a prominent color or flashing manner, and display the alarm information and emergency measure prompts to guide the crew to take actions in a timely manner. This design improves the user experience and practicality of the device, providing convenient and intuitive information support for the monitoring and maintenance of marine NH 3 engines.

[0026] In some embodiments, the device further includes an alarm unit, which is connected to the control processing unit. When the NH 3 concentration of the gas to be detected is greater than the set threshold, the control processing unit controls the alarm unit to send out an alarm message indicating abnormal NH 3 concentration.

[0027] Adopting the technical solution of the above embodiment adds an important safety warning function to the device. When the detected NH 3 concentration exceeds the set safety threshold, the control processing unit quickly starts the alarm program and controls the alarm unit to send out an alarm message indicating abnormal NH 3 concentration. The combination of sound and light alarms ensures that the crew can promptly detect the alarm signal in the noisy ship environment. The rapid alarm sound and flashing red light quickly attract the attention of the crew, while the specific alarm content and emergency measure prompts provide clear action guidelines for the crew. This warning mechanism effectively prevents safety accidents such as poisoning, fire or explosion that may be caused by excessive NH 3 concentration, safeguards the safety of the ship and the crew, and builds a solid defense line for the safe operation of marine NH 3 engines.

[0028] One or more technical solutions provided by the present invention have at least the following technical effects or advantages: 1. The sampling and collection component actively collects the gas samples around the vaporizer for NH 3 and, by using the optical signal detection principle of the detection signal transmitting and receiving unit and combining with the intelligent data processing of the control and processing unit, can accurately calculate the NH 3 concentration. At the same time, a multi-source data fusion compensation model for temperature, humidity, acceleration, etc. is introduced to effectively eliminate the interference of environmental factors on the detection results, significantly improve the detection accuracy and reliability, and ensure accurate NH 3 concentration data under different environmental conditions, providing a solid data guarantee for the safe operation of marine NH 3 engines.

[0029] 2. High automation is achieved. The control and processing unit is not only responsible for data processing and concentration calculation, but also can intelligently adjust the sampling frequency and signal transmission frequency according to the operating state of the NH 3 engine to optimize the detection process. In addition, the device has an automatic alarm function. When the detected NH 3 concentration exceeds the standard, it can issue a warning in time to remind the crew to take measures. The display screen shows the detection results and relevant information in real time, providing an intuitive operation interface for the operator. This intelligent design greatly reduces the complexity and workload of manual operation, improves the usability and working efficiency of the device, and makes the monitoring of marine NH 3 engines more convenient and efficient.

[0030] 3. The salt spray filtering unit in the sampling and collection component effectively addresses the salt spray problem in the marine environment, prevents the corrosion and pollution of the detection elements by salt particles, and extends the service life of the device. The addition of the air pressure sensor enables the device to monitor and adjust the air pressure in the detection chamber in real time to ensure the stability of the detection process. At the same time, by setting safety thresholds and alarm units, the device can issue an alarm in time when the NH 3 concentration is abnormal, preventing potential safety accidents and ensuring the safety of the ship and crew. These designs enable the device to operate stably in the complex and changeable marine environment for a long time, providing a strong guarantee for the safe use of marine NH 3 engines and helping the shipping industry achieve green and safe development. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present invention and, together with the specification, are used to explain the principles of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings: Figure 1 is a structural schematic diagram of a marine NH 3 automatic collection and detection device according to an embodiment of the present invention; Figure 2 is a unit connection diagram of a marine NH 3 automatic collection and detection device according to an embodiment of the present invention. Detailed implementation manners

[0032] The terms used in the following embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the specification of the present invention, the singular forms "a", "an", "the above", "the", and "this" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in the present invention refers to any or all possible combinations including one or more of the listed items.

[0033] Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0034] It should also be noted that, unless otherwise clearly specified and limited, the terms "arranged" and "connected" in the embodiments of the present invention should be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements; it may be a wired communication connection or a wireless communication connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The embodiments of the present invention will be specifically described below.

[0035] The embodiment of the present invention provides a marine NH 3 automatic collection and detection device (for the convenience of description, hereinafter referred to as the device or detection device), as Figure 1 shown, includes a sampling and collection component 1, a detection chamber 2, a detection signal transmitting unit 3, a detection signal receiving unit 4, and a control and processing unit 5; the control and processing unit 5 is respectively connected to the sampling and collection component 1, the detection signal transmitting unit 3, and the detection signal receiving unit 4.

[0036] Among them, the sampling and collection component 1 is connected to the detection chamber 2, and the sampling and collection component 1 is arranged on the NH of the marine NH 3 engine's NH3 Around the vaporizer, used to drive NH according to the sampling instruction of the control processing unit 5 3 The gas to be measured around the vaporizer enters the detection chamber 2.

[0037] Specifically, the sampling and collection component 1 is connected to the detection chamber 2 and is arranged around the NH 3 of the marine NH 3 around the vaporizer to form an efficient gas collection channel. When the control processing unit 5 issues a sampling instruction, the sampling and collection component 1 responds quickly, starts the built-in micro air pump or fan and other power devices, generates negative pressure or air flow, and precisely inhales the gas to be measured around the NH 3 around the vaporizer into the collection pipeline. These gases flow rapidly in the pipeline, and will undergo preliminary pretreatment such as dust removal and dehumidification to eliminate the interference of particulate matter and moisture on the detection, and then are smoothly introduced into the detection chamber 2. The gas environment in the detection chamber 2 is relatively stable, providing good conditions for the subsequent emission and reception of detection signals, ensuring the accuracy and reliability of NH 3 concentration detection. Through this design, the sampling and collection component 1 can timely capture the tiny NH 3 leakage around the vaporizer, laying a solid foundation for the real-time monitoring and safety guarantee of the operation status of the NH 3 engine. 3 It has laid a solid foundation for the real-time monitoring of the engine operation status and safety guarantee.

[0038] The detection signal transmitting unit 3 and the detection signal receiving unit 4 are arranged opposite to each other and are respectively located on both sides of the detection chamber 2; the detection signal transmitting unit 3 is used to emit a detection optical signal with a preset wavelength according to the detection instruction of the control processing unit 5, so that the detection optical signal passes through the gas to be measured in the detection chamber 2 and shoots towards the detection signal receiving unit 4; the detection signal receiving unit 4 is used to receive the detection optical signal and generate an electric induction signal.

[0039] Specifically, the detection signal transmitting unit 3 and the detection signal receiving unit 4 are arranged opposite to each other on both sides of the detection chamber 2 to form a straight optical path, ensuring that the detection optical signal can pass through the gas to be measured in the detection chamber 2 without obstruction. When the control processing unit 5 issues a detection instruction, the detection signal transmitting unit 3 is immediately started, and a detection optical signal with a preset wavelength is emitted by using the built-in laser or a light source with a specific wavelength. The detection optical signal travels along the set optical path, passes through the gas to be measured in the detection chamber 2, and interacts with gas molecules during this process, such as absorption, scattering, etc., thus carrying the gas concentration information. At the same time, the detection signal receiving unit 4 is waiting in full force at the other end of the optical path. When the detection optical signal arrives, its built-in photodetector (such as a photodiode, a photomultiplier tube, etc.) responds quickly and converts the received optical signal into an electric induction signal. The intensity of this electric induction signal is related to the NH in the gas to be measured 3is closely related to the concentration, providing a key basis for subsequent concentration calculation and data analysis.

[0040] Through this carefully designed optical signal emission and reception mechanism, the device can achieve non-contact and high-precision detection of NH 3 concentration, is not affected by electromagnetic interference, and has the advantages of fast response speed and high sensitivity.

[0041] In this embodiment, the wavelength of the detection optical signal is usually selected in the infrared band where the NH 3 molecule has a characteristic absorption peak. The NH 3 molecule has multiple characteristic absorption peaks in the infrared region. One of the more prominent absorption peaks is located in the mid-infrared band, around 10 micrometers (10,000 nanometers). Specifically, it is between 9.5 and 10.5 micrometers. The absorption peak in this wavelength range is mainly due to the vibration mode of the NH 3 molecule, which has high selectivity and sensitivity and can effectively distinguish NH 3 from other gas molecules.

[0042] The control processing unit 5 is used to determine the NH 3 concentration of the gas to be measured according to the electrical induction signal. Specifically, after receiving the electrical induction signal transmitted by the detection signal receiving unit 4, the control processing unit 5 first preprocesses the signal, including operations such as filtering and amplification, to eliminate noise interference and extract the effective signal components. Then, according to the attenuation of the preset wavelength detection optical signal emitted by the detection signal transmitting unit 3 when passing through the gas to be measured, using the Beer-Lambert Law, which states that the attenuation degree of the optical signal is proportional to the gas concentration, that is, A = ∈·c·l, where A is the absorbance (related to the intensity of the electrical induction signal), ∈ is the molar absorption coefficient (related to the characteristics of the NH 3 molecule), c is the gas concentration, and l is the optical path length.

[0043] The control processing unit 5 substitutes the molar absorption coefficient ∈ of NH 3 at this wavelength obtained through pre-calibration, and the known optical path length l into the above formula to calculate the NH 3 concentration c of the gas to be measured.

[0044] In this embodiment, the above device design is adopted. The sampling and collection component 1 actively collects the gas to be measured around the vaporizer, ensuring the timeliness and accuracy of the detection and avoiding NH 3 from 3Detection delay and error caused by diffusion. The design of the detection chamber 2 provides a stable detection environment for the gas to be detected, enabling the detection signal transmitting unit 3 and the detection signal receiving unit 4 to accurately transmit and receive optical signals. Using the photoinductive signal generated after the detection optical signal with a preset wavelength passes through the gas to be detected, the control and processing unit 5 can accurately calculate the NH 3 concentration. This process is not interfered by the external environment, improving the detection sensitivity and reliability. At the same time, the automated design of this embodiment reduces the complexity and risk of manual operation, lowers the maintenance cost, and improves the work efficiency. This embodiment is aimed at NH 3 vaporizers, which are prone to unreliable sealing in high-temperature and high-pressure environments, and can effectively and accurately detect the NH 3 concentration to determine whether the NH 3 vaporizer leaks. While ensuring the normal operation of the marine NH 3 engine, it effectively prevents the threat to the safety of the ship's crew caused by NH 3 leaks.

[0045] In this embodiment, the control and processing unit 5 serves as the core of the marine NH3 automatic collection and detection device, responsible for key tasks such as data processing, signal control, and decision execution.

[0046] The control and processing unit 5 can use a high-performance industrial-grade microprocessor or an embedded system as the main control chip, such as the ARM Cortex series, Intel Atom series, or Xilinx FPGA, etc. These processors have powerful data processing capabilities and real-time performance, can efficiently process a large amount of data from sensors, and quickly make control decisions. And it needs to be equipped with sufficient storage devices, such as flash memory (Flash), random access memory (RAM), and hard disk (HDD) or solid-state drive (SSD), for storing detection data, program code, historical records, and other information to ensure the reliability and integrity of the data.

[0047] At the same time, the control and processing unit 5 also needs to integrate a variety of communication interface hardware, such as RS-232 / RS-485 serial ports, Ethernet interfaces, USB interfaces, and wireless communication modules (such as Wi-Fi, Bluetooth, LoRa, etc.), to achieve stable communication and data transmission with sensors, display screens 91, alarm units 92, and other external devices.

[0048] To improve the stability and reliability of the system, a high-quality power management module should also be selected to provide a stable power supply for the control processing unit 5 and have functions such as overload protection and short-circuit protection. When designing the hardware, the particularity of the marine environment, such as shock resistance, moisture resistance, and corrosion resistance, should also be fully considered, and a housing and components with good protection performance should be selected to ensure that the control processing unit 5 can operate stably for a long time under harsh marine conditions.

[0049] In some embodiments, the sampling and collection assembly 1 includes a vacuum pump 11 and an intake pipe 12. The intake port 121 of the intake pipe 12 is located around the NH 3 vaporizer. The intake pipe 12 is connected to the detection chamber 2, and the vacuum pump 11 is arranged on the intake pipe 12 to generate a negative pressure in the intake pipe 12.

[0050] Among them, the intake port 121 of the intake pipe 12 is located in the surrounding area of the NH 3 vaporizer, so that the NH that may leak from the vaporizer can be captured to the maximum extent 3 gas, ensuring the accuracy and representativeness of sampling. The other end of the intake pipe 12 is closely connected to the detection chamber 2, providing a direct passage for the gas to be measured to the detection area, enabling the gas to smoothly enter the detection chamber 2 and undergo subsequent detection and analysis.

[0051] The vacuum pump 11 is the core power device of the sampling and collection assembly 1 and is arranged on the intake pipe 12. When it starts to work, the vacuum pump 11 extracts the gas in the intake pipe 12 to generate a negative pressure inside the pipe. This negative pressure effect can generate a sufficient suction force to actively suck the gas around the NH 3 vaporizer into the intake pipe 12, overcoming the limitation of relying solely on natural gas diffusion, greatly improving the sampling efficiency and speed. At the same time, the generation of negative pressure also helps to reduce the interference of the external environmental air on the sampling process, avoid the mixing of other irrelevant gases, and ensure the purity of the gas to be measured and the reliability of the detection results.

[0052] Through this structural design and working principle, the sampling and collection assembly 1 can stably and efficiently transport the gas to be measured to the detection chamber 2, laying a solid foundation for achieving accurate detection of the NH 3 concentration.

[0053] Furthermore, in some embodiments, the sampling and collection assembly 1 further includes a salt spray filtering unit 13, and the salt spray filtering unit 13 is arranged at the intake port 121 to filter the salt spray in the marine environment.

[0054] In this embodiment, considering the maritime environment where salt spray pervades, if salt particles enter the detection system along with the gas, it may have many adverse effects on the subsequent detection process, such as clogging the intake pipe 12, contaminating the detection element, interfering with the transmission of optical signals, etc., thereby reducing the detection accuracy and the service life of the equipment. The addition of the salt spray filtering unit 13 effectively solves this problem.

[0055] The salt spray filtering unit 13 uses high-efficiency filtering materials, such as special filter screens or filter elements, such as activated carbon, glass fiber, polytetrafluoroethylene, polypropylene, etc. These materials are densely covered with tiny pores on the surface, which can precisely intercept and adsorb the salt particles in the salt spray, allowing the gas to pass through smoothly while keeping the salt out. In this way, the measured gas processed by the salt spray filtering unit 13 becomes relatively pure and no longer contains a large amount of salt impurities, providing a good gas environment for the subsequent NH 3 detection, ensuring the reliability of the detection results and the long-term stable operation of the equipment, fully reflecting the comprehensive consideration and ingenious response of the present invention to the special environmental factors at sea.

[0056] In some embodiments, such as Figure 1 and Figure 2 shown, the detection device of this embodiment further includes one or more of a pressure sensor 6, a temperature sensor 7, a humidity sensor 8, a display screen 91, and an alarm unit 92.

[0057] Among them, the pressure sensor 6 is arranged in the detection chamber 2 for detecting the air pressure in the detection chamber 2. The pressure sensor 6 is connected to the control and processing unit 5, and the control and processing unit 5 is connected to the vacuum pump 11.

[0058] As the core area for gas detection, the stability of the internal air pressure in the detection chamber 2 is directly related to the accuracy and reliability of the detection results. The pressure sensor 6 can keenly capture the minute air pressure changes in the detection chamber 2 through high-precision sensing elements, whether it is due to fluctuations during the gas collection process or changes in the external environmental air pressure, all of which can be accurately sensed by it.

[0059] The pressure sensor 6 is closely connected to the control and processing unit 5, and transmits the detected air pressure data to the control and processing unit 5 in real time. After receiving the air pressure data, the control and processing unit 5 will quickly analyze and process it to determine whether the current air pressure is within the set reasonable range. If the air pressure is too high or too low, the control and processing unit 5 will immediately activate the corresponding adjustment mechanism, and its connection with the vacuum pump 11 plays a key role at this time.

[0060] The control processing unit 5 sends adjustment instructions to the vacuum pump 11 to precisely regulate the working state of the vacuum pump 11, such as adjusting the pumping rate or starting and stopping the vacuum pump 11, thereby changing the negative pressure in the intake pipe 12 and further affecting the air pressure in the detection chamber 2.

[0061] Through this intelligent linkage method, the detection device can always maintain the air pressure in the detection chamber 2 stable, creating good environmental conditions for the accurate detection of NH 3 concentration, ensuring that the detection results are not interfered by air pressure fluctuations, greatly improving the detection performance and adaptability of the device, and enabling it to operate stably and reliably in the complex and changeable marine environment.

[0062] The temperature sensor 7 is used to detect temperature information, and the humidity sensor 8 is used to detect humidity information. Both the temperature sensor 7 and the humidity sensor 8 are set around the NH 3 vaporizer and are both connected to the control processing unit 5. The control processing unit 5 is also used to compensate for the NH 3 concentration of the measured gas according to the temperature information and humidity information.

[0063] The temperature sensor 7 and the humidity sensor 8 are important environmental monitoring components in the marine NH 3 automatic collection detection device of the present invention, and they are both arranged in the surrounding area of the NH 3 vaporizer. In this embodiment, considering that during the operation of the NH 3 vaporizer, the temperature and humidity conditions around it will directly affect the NH 3 vaporization efficiency and the properties of the measured gas, and thus have a significant impact on the detection results of the NH 3 concentration. The temperature sensor 7 uses a high-precision temperature sensing element, which can perceive the temperature change around the NH 3 vaporizer in real time and accurately. Whether it is due to the fluctuation of the ambient temperature or the heat generated during the operation of the vaporizer, it can be keenly captured. The humidity sensor 8 uses advanced humidity sensing technology to accurately measure the water vapor content in the surrounding air and obtain humidity information in a timely manner. The temperature and humidity data obtained by these two sensors are transmitted to the control processing unit 5 in real time through a stable connection with the control processing unit 5.

[0064] The control processing unit 5, according to the received temperature and humidity information, combines the physical and chemical characteristics of NH 3 and uses the built-in compensation algorithm to accurately compensate for the NH 3 concentration of the measured gas. This is because the changes in temperature and humidity may cause changes in the diffusion rate, absorption spectrum characteristics, etc. of NH 3 molecules, thereby affecting the accuracy of the detection signal.

[0065] Through compensation processing, the control processing unit 5 can eliminate the errors caused by these environmental factors, ensuring that the detected NH 3 concentration value is closer to the true value, significantly improving the reliability and accuracy of the detection result, and providing a strong guarantee for the safe operation and performance monitoring of the marine NH 3 engine.

[0066] In some embodiments, the control processing unit 5 is further configured to obtain the acceleration information of the vessel, and compensate for the NH 3 concentration of the gas to be measured according to the acceleration information, temperature information, and humidity information.

[0067] It should be noted that during the navigation of the vessel, it will inevitably experience various acceleration changes, such as acceleration, deceleration, etc. These fluctuations in acceleration will cause changes in the air flow velocity and distribution in the detection chamber 2, which in turn affect the interaction between the NH 3 molecules and the detection optical signal, resulting in deviations in the detection result.

[0068] The control processing unit 5 is connected to the navigation system or accelerometer of the vessel to obtain accurate acceleration information in real time. Combining the existing temperature and humidity information, the control processing unit 5 uses a set compensation algorithm to comprehensively consider the effects of acceleration, temperature, and humidity on the NH 3 detection process.

[0069] For example, changes in acceleration may affect the diffusion coefficient of NH 3 molecules, an increase in temperature will accelerate the movement of NH 3 molecules, and an increase in humidity may change the absorption characteristics of the gas to be measured or NH 3 molecules, etc. The control processing unit 5 dynamically adjusts the processing parameters of the detection signal according to the interaction of these factors to accurately compensate for the NH 3 concentration.

[0070] In this embodiment, through a large number of prior experiments, sufficient experimental data support and algorithm optimization are obtained to ensure the accuracy and stability of the compensation effect. Through this comprehensive compensation mechanism, this embodiment can always provide accurate and reliable NH 3 concentration detection results under various complex navigation conditions, providing a solid data guarantee for the safe operation and performance optimization of the marine NH 3 engine, fully reflecting the core value and technological innovation of the control processing unit 5 in the device.

[0071] Furthermore, the control processing unit 5 is specifically configured to input the acceleration information, temperature information, and humidity information into a preset multi-source data fusion compensation model to obtain a compensation factor, and compensate for the NH 3 concentration of the gas to be measured based on the compensation factor.

[0072] Among them, the multi-source data fusion compensation model is a complex algorithm model that comprehensively considers the influence of various environmental factors on NH 3 detection. Through algorithms such as deep learning and neural networks, it fuses the information of different data sources, and discovers the correlation rules between various factors and the 3 detection error of NH concentration.

[0073] A series of calculations and analyses will be carried out inside the source data fusion compensation model, such as weighted fusion and error correction. Finally, an accurate compensation factor will be output. This compensation factor is a value that comprehensively considers the influence of acceleration, temperature, and humidity, and reflects the degree to which the 3 detection result of NH concentration needs to be adjusted under the current environmental conditions.

[0074] The control processing unit 5 then compensates and corrects the detected NH 3 concentration value based on this compensation factor. The correction process usually involves multiplying or adding the original detected concentration by the compensation factor to obtain the compensated 3 NH concentration value, thereby eliminating the detection error caused by environmental factors and ensuring the accuracy and reliability of the detection result.

[0075] This process not only improves the detection accuracy, but also enhances the adaptability of the device in complex marine environments, providing strong technical support for the stable operation and performance monitoring of marine NH 3 engines.

[0076] In this embodiment, the construction and training process of the multi-source data fusion compensation model is as follows: 1) Collect historical data: During the actual operation of the marine NH 3 engine, collect a large amount of historical data, including NH 3 concentration detection data, acceleration data, temperature data, and humidity data, etc. These data can be obtained from sensor records, device logs, and maintenance reports.

[0077] 2) Synchronize data: Ensure that the collected data of various types are synchronized in time, that is, each piece of 3 NH concentration detection data has corresponding acceleration, temperature, and humidity data. In this way, the influence of different environmental factors on NH 3 concentration detection can be accurately analyzed.

[0078] 3) Data preprocessing: Clean and preprocess the collected original data to remove outliers, noise, and missing values. For example, the noise in the acceleration data can be removed through a filtering algorithm, and the missing values in the temperature or humidity data can be filled by interpolation methods to improve the quality and usability of the data.

[0079] 4) Feature extraction: Extract features from the original data that are helpful for model learning. For acceleration data, features such as the magnitude of acceleration and the rate of change of direction can be extracted; for temperature and humidity data, features such as the absolute value of temperature, the rate of change, and the relative value of humidity can be extracted. At the same time, some cross features can also be considered, such as the interaction features between acceleration and temperature, to capture the complex relationships between different factors.

[0080] 5) Feature selection: Select the features that have the most influence on NH 3 concentration detection compensation through methods such as correlation analysis and feature importance evaluation. Eliminate redundant and irrelevant features to reduce the complexity of the model and improve the training efficiency.

[0081] 6) Feature normalization: Normalize the extracted features so that they are within the same dimension range, which is convenient for model training and learning. Commonly used normalization methods include min-max normalization, Z-score normalization, etc.

[0082] 7) Select a suitable model: According to the characteristics of the problem and the nature of the data, select a model suitable for multi-source data fusion compensation. Commonly used models include neural networks, support vector machines, random forests, Bayesian networks, etc. Neural networks have powerful non-linear mapping capabilities and adaptive learning capabilities, and are suitable for dealing with complex multi-factor interaction relationships; support vector machines perform well in the case of small samples and are suitable for dealing with high-dimensional data; random forests have good robustness and interpretability and are suitable for dealing with large-scale data.

[0083] 8) Determine the model structure: For neural network models, it is necessary to determine structural parameters such as the number of network layers, the number of neurons in each layer, and the type of activation function. For support vector machine models, it is necessary to select a suitable kernel function and kernel parameters. For random forest models, it is necessary to determine parameters such as the number of trees and the depth of the trees. The selection of these structural parameters needs to be adjusted and optimized according to the complexity of the data and the performance requirements of the model.

[0084] 9) Divide the training set and the test set: Divide the collected data set into a training set and a test set. Usually, 70% of the data is used as the training set and 30% of the data is used as the test set. The training set is used for model training, and the test set is used for model evaluation and verification.

[0085] 10) Train the model: Use the training set data to train the selected model. Adjust the parameters of the model through optimization algorithms (such as gradient descent method, genetic algorithm, etc.) to make it achieve the best fitting effect on the training data. For example, when training a neural network, update the weights and biases of the network through the backpropagation algorithm to make the output of the network as close as possible to the actual NH 3 concentration value.

[0086] 11) Cross-validation: During the training process, the cross-validation method is adopted to verify the model to prevent overfitting. The training set is further divided into multiple subsets, and one subset is used as the validation set in turn, while the remaining subsets are used as the training set. The model is trained and verified multiple times, and the average result is taken as the performance index of the model.

[0087] 12) Evaluation metrics: Appropriate evaluation metrics are selected to measure the performance of the model. Commonly used evaluation metrics include mean squared error (MSE), root mean squared error (RMSE), mean absolute error (MAE), coefficient of determination (R 2 ) etc. These metrics can reflect the accuracy and stability of the model when predicting NH3 concentration.

[0088] 13) Testing the model: Use the test set data to test the trained model and calculate the evaluation metric values of the model on the test set. By comparing the test results of different models, the model with the optimal performance is selected as the final multi-source data fusion compensation model.

[0089] 14) Model optimization: According to the results of model evaluation, the model is further optimized. The structural parameters of the model, the parameters of the training algorithm, etc. can be adjusted to improve the prediction accuracy and generalization ability of the model. For example, the number of layers or neurons of the neural network can be increased, the kernel parameters of the support vector machine can be adjusted, or the number and depth of the trees in the random forest can be changed, etc.

[0090] In some embodiments, the control processing unit 5 can also compensate for the NH 3 concentration according to the concentration detection compensation formula. Among them, the concentration detection compensation formula includes: Among them, C represents the compensated NH3 concentration, and C m represents the detected NH3 concentration.

[0091] a represents the acceleration information of the ship.

[0092] T represents the temperature information.

[0093] T 0 represents the reference temperature, usually set as the ambient temperature when the NH 3 vaporizer is working properly, such as 20°C, 25°C, etc.

[0094] H represents the humidity information.

[0095] H 0 represents the reference humidity, usually set as the ambient humidity when the NH 3 vaporizer is working properly, such as 50%, 60%, etc.

[0096] α is the acceleration compensation coefficient, representing the influence degree of acceleration on the NH 3 concentration detection, in exponential form, reflecting the influence of acceleration change on the air flow velocity and NH 3 diffusion rate.

[0097] β and δ respectively represent the linear influence coefficients of temperature and humidity changes on the NH 3 concentration detection, used to adjust the influence degree of the changes of temperature and humidity relative to the reference values on the detection results.

[0098] γ and η respectively represent the non - linear influence indices of temperature and humidity changes on the NH 3 concentration detection, used to describe the non - linear degree of the influence of temperature and humidity changes on the NH 3 concentration detection.

[0099] In this embodiment, through experiments or data analysis, NH 3 concentration detection data and actual concentration data under different acceleration, temperature and humidity conditions are collected. Using non - linear fitting methods, such as the least - squares method, gradient descent method, etc., according to the collected data, the optimal coefficients α, β, γ, δ and η are fitted, so that the formula can best fit the actual NH 3 concentration detection data.

[0100] Among them, the non - linear index compensation form provides a more flexible compensation method for temperature and humidity changes, and can better describe their complex influence on the NH 3 concentration detection, improving the reliability and accuracy of the detection results.

[0101] In some embodiments, the control processing unit 5 is further configured to control the sampling frequency of the sampling and collection component 1 and the signal transmission frequency of the detection signal transmission unit 3 according to the operating state of the marine NH 3 engine.

[0102] Specifically, when the NH 3 engine is in a high - load operating state, the consumption and emissions of NH 3 are relatively large, and the NH 3 carburetor is more likely to have NH 3 leakage. At this time, the control processing unit 5 will receive a high - load signal transmitted from the engine operating state monitoring system, and then analyze and judge that it is necessary to improve the detection sensitivity and timeliness. Therefore, the control processing unit 5 sends an instruction to the sampling and collection component 1 to increase the sampling frequency, so that the vacuum pump 11 operates at a higher frequency, accelerating the extraction speed of the gas in the intake pipe 12, thereby collecting the gas samples around the NH 3 carburetor more frequently, ensuring that the possible NH 3Leakage situation.

[0103] At the same time, the control processing unit 5 will also increase the signal emission frequency of the detection signal emission unit 3, so that the detection light signal passes through the gas in the detection chamber 2 at a faster rate, increasing the amount of detection data obtained per unit time, and improving the accuracy and reliability of the detection results.

[0104] In contrast, in NH 3 When the engine is under low load or stopped, NH 3 The emission of NH 3 NH appears in the carburetor 3 The probability of leakage is relatively low. The control processing unit 5 will reduce the sampling frequency and signal transmission frequency accordingly to reduce energy consumption and extend the service life of the equipment, while ensuring the economy and rationality of the detection.

[0105] Through this intelligent control strategy, the device can 3 The engine's operating status is closely coordinated to achieve NH 3 Accurate control of the concentration detection process provides marine NH 3 It provides strong guarantee for the safe and efficient operation of the engine.

[0106] In some embodiments, the display screen 91 is connected to the control processing unit 5 for displaying the detection result of the detected gas.

[0107] Specifically, the control processing unit 5 completes the NH 3 After the concentration is accurately calculated and compensated, the final test data will be transmitted to the display screen 91 in the form of numbers, charts or graphics. The display screen 91 adopts high-resolution and high-contrast display technology to ensure that the test results can be clearly displayed under various lighting conditions. For example, it can display NH 3 The concentration is usually expressed in ppm (parts per million) or mg / m 3 (mg per cubic meter), allowing operators to understand the current NH 3 In addition, the display screen 91 can also display the concentration level of NH 3 The trend chart of concentration change over time can be used to show the NH 3 The fluctuation of NH concentration in different time periods is used to analyze 3 The engine's operating status and carburetor's performance are visualized. 3 When the concentration increases abnormally, the display screen 91 can promptly remind the operator in a striking color (such as red) or by flashing, and may also display an alarm message and corresponding emergency measures, such as "NH 3"The concentration exceeds the standard. Please check the sealing condition of the vaporizer", etc., to ensure that the crew can respond quickly and take corresponding measures to ensure the safe operation of the ship.

[0108] The design of the display screen 91 fully considers the particularity of the marine environment and has good shock resistance, moisture resistance and corrosion resistance, ensuring that it can still work stably and reliably under harsh marine conditions, providing convenient and intuitive information support for the monitoring and maintenance of marine NH 3 engines.

[0109] In some embodiments, the alarm unit 92 is connected to the control processing unit 5. When the NH 3 concentration of the measured gas is greater than the set threshold, the control processing unit 5 controls the alarm unit 92 to send out an alarm message indicating abnormal NH 3 concentration.

[0110] Specifically, the control processing unit 5 monitors and analyzes the NH 3 concentration data of the measured gas in real time and compares it with the preset safety threshold. This threshold is determined comprehensively based on factors such as the dangerous concentration limit of NH 3 , the safety standards of the ship, and the operating requirements of the engine, etc. Once the detected NH 3 concentration exceeds this set threshold, it indicates that there may be NH 3 leakage or other abnormal situations. At this time, the control processing unit 5 will immediately start the alarm program and send an instruction to the alarm unit 92.

[0111] After receiving the instruction, the alarm unit 92 quickly sends out obvious alarm information, usually including two forms: sound and light alarms. The sound alarm will emit a rapid and loud alarm sound, such as a beeping sound or a siren sound, to ensure that it can attract the attention of the crew in the noisy ship environment; the light alarm will provide a visual warning through flashing red lights or other warning lights, enabling the crew to quickly identify the alarm status.

[0112] The alarm information may also include specific alarm content, such as "NH 3 concentration exceeds the standard", "NH 3 leakage in the detection area", etc., as well as possible emergency measure prompts to guide the crew to take actions in a timely manner, such as starting the emergency ventilation system, closing relevant valves, evacuating personnel, etc., to prevent the NH 3 concentration from rising further and avoid possible safety accidents such as poisoning, fire or explosion, ensuring the safety of the ship and the crew.

[0113] Through this automated alarm mechanism, the device can respond to abnormal NH 3 concentration situations in a timely manner, providing a strong guarantee for the safe operation of marine NH 3 engines.

[0114] Marine NH 3 Automatic collection and detection device, through key parts such as the sampling and collection component 1, the detection chamber 2, the detection signal transmitting and receiving unit, and the control and processing unit 5, realizes the efficient and accurate detection of the NH 3 NH around the vaporizer 3 concentration. The sampling and collection component 1 cleverly combines the vacuum pump 11 and the intake pipe 12 to actively collect the gas to be measured, ensuring the timeliness and representativeness of the detection; the salt spray filtration unit 13 effectively intercepts the marine salt spray particles to protect the detection elements from contamination. The detection signal transmitting and receiving unit uses the optical signal with a specific wavelength to pass through the gas in the detection chamber 2 to generate an electrical induction signal related to the NH 3 concentration, providing accurate data for subsequent processing.

[0115] The control and processing unit 5 not only processes the temperature, humidity, and acceleration information from the sensors, but also integrates the multi-source data compensation model to dynamically calculate the compensation factor to accurately correct the NH 3 concentration, eliminating the interference of environmental factors to accurately detect whether the NH 3 vaporizer leaks. In addition, the display screen 91 intuitively presents the detection results, and the alarm unit 92 issues a warning in a timely manner when the concentration exceeds the standard to ensure the safety of the ship.

[0116] The whole device has a high degree of automation, is easy to operate, and has strong adaptability, providing strong technical support for the safe operation and performance monitoring of marine NH3 engines, and helping the shipping industry achieve low-carbon and sustainable development.

[0117] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A marine NH3 automatic collection and detection device, characterized in that: It includes a sampling and collecting component, a detection chamber, a detection signal transmitting unit, a detection signal receiving unit and a control processing unit; the control processing unit is connected to the sampling and collecting component, the detection signal transmitting unit and the detection signal receiving unit respectively; The sampling and collecting assembly is connected to the detection chamber, and the sampling and collecting assembly is arranged around the NH3 vaporizer of the marine NH3 engine, and is used to drive the measured gas around the NH3 vaporizer into the detection chamber according to the sampling instruction of the control processing unit; The detection signal transmitting unit and the detection signal receiving unit are arranged opposite to each other and are respectively located on both sides of the detection chamber; the detection signal transmitting unit is used to transmit a detection light signal of a preset wavelength according to the detection instruction of the control processing unit, so that the detection light signal passes through the detected gas in the detection chamber and is emitted to the detection signal receiving unit; the detection signal receiving unit is used to receive the detection light signal and generate a photoelectric sensing signal; The control processing unit is used to determine the NH3 concentration of the measured gas according to the photoelectric sensing signal.

2. The device according to claim 1, characterized in that The sampling and collecting assembly includes a vacuum pump and an air intake pipe. The air intake of the air intake pipe is located around the NH3 vaporizer. The air intake pipe is connected to the detection chamber. The vacuum pump is arranged on the air intake pipe to generate negative pressure in the air intake pipe.

3. The device according to claim 2, characterized in that The sampling and collecting assembly further comprises a salt mist filtering unit, which is arranged at the air inlet and is used for filtering salt mist in a marine environment.

4. The device according to claim 2, characterized in that It also includes an air pressure sensor, which is arranged in the detection chamber and is used to detect the air pressure in the detection chamber. The air pressure sensor is connected to the control processing unit, and the control processing unit is connected to the vacuum pump.

5. The device according to any one of claims 1 to 4, characterized in that: It also includes a temperature sensor for detecting temperature information and a humidity sensor for detecting humidity information. The temperature sensor and the humidity sensor are both arranged around the NH3 vaporizer and are both connected to the control processing unit. The control processing unit is also used to compensate for the NH3 concentration of the measured gas according to the temperature information and the humidity information.

6. The device according to claim 5, characterized in that The control processing unit is also used to obtain acceleration information of the ship, and compensate the NH3 concentration of the measured gas according to the acceleration information, the temperature information and the humidity information.

7. The device according to claim 6, characterized in that The control processing unit is specifically used to input the acceleration information, the temperature information and the humidity information into a preset multi-source data fusion compensation model to obtain a compensation factor, and compensate for the NH3 concentration of the measured gas based on the compensation factor.

8. The device according to claim 1, characterized in that The control processing unit is also used to control the sampling frequency of the sampling collection component and the signal transmission frequency of the detection signal transmission unit according to the operating state of the marine NH3 engine.

9. The device according to claim 1, characterized in that It also includes a display screen, which is connected to the control processing unit and is used to display the detection result of the detected gas.

10. The device according to claim 1, characterized in that It also includes an alarm unit, which is connected to the control processing unit. When the NH3 concentration of the measured gas is greater than a set threshold, the control processing unit controls the alarm unit to issue an alarm message of abnormal NH3 concentration.

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