A marine NH3 automatic collection and detection device

Abstract

This invention discloses an automatic NH3 collection and detection device for marine NH3 engines. The device includes 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 sampling and collection component is connected to the detection chamber and is positioned around the NH3 vaporizer of the marine NH3 engine to drive the gas to be tested around the vaporizer into the detection chamber. The detection signal transmitting unit and the detection signal receiving unit are positioned opposite each other and located on opposite sides of the detection chamber. The detection signal transmitting unit emits a detection light signal of a preset wavelength to allow the light signal to pass through the gas to be tested in the detection chamber. The detection signal receiving unit receives the detection light signal and generates an inductive signal. The control and processing unit determines the NH3 concentration of the gas to be tested based on the inductive signal. This invention can accurately detect NH3 leaks, ensuring the normal operation of marine NH3 engines and personnel safety.

Description

Technical Field

[0001] This invention relates to the field of marine NH3 engine technology, and in particular to an automatic marine NH3 collection and detection device. Background Technology

[0002] An NH3 engine is an internal combustion engine that uses ammonia (NH3) as fuel, characterized by low carbon emissions and the use of renewable energy. It generates power by burning ammonia gas inside the engine cylinder, primarily producing nitrogen and water with virtually no carbon dioxide, aligning with the global trend towards low-carbon development. Ammonia fuel can be produced from renewable energy sources, making it sustainable.

[0003] For this reason, NH3 engines have promising applications in marine propulsion, providing the shipping industry with a low-carbon and sustainable energy solution. By using ammonia as fuel, NH3 engines can significantly reduce carbon dioxide emissions from ships, contributing to the shipping industry's decarbonization goals.

[0004] In an NH3 engine, the NH3 carburetor is a key component. Its main function is to convert liquid ammonia fuel into a gaseous state for combustion in the engine. The NH3 carburetor heats the liquid ammonia to vaporize it and then delivers the gaseous ammonia to the engine's combustion chamber.

[0005] However, since NH3 vaporizers operate under high temperature and high pressure for extended periods, and NH3 is highly corrosive, NH3 vaporizers inevitably experience issues such as aging of seals, material corrosion, or poor connections. This can lead to gaseous NH3 leaking out of the vaporizer, affecting the normal operation of the NH3 engine and posing a threat to the safety of the crew on board.

[0006] Therefore, how to accurately detect NH3 leaks and ensure the normal operation of marine NH3 engines and the safety of personnel is an urgent problem to be solved. Summary of the Invention

[0007] To address the aforementioned technical problems and deficiencies, the purpose of this invention is to provide a marine NH3 automatic collection and detection device that can accurately detect whether NH3 is leaking, ensuring the normal operation of marine NH3 engines and the safety of personnel.

[0008] To achieve the above objectives, the present invention provides a marine NH3 automatic collection and detection device, comprising 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 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 is disposed around the NH3 vaporizer of the marine NH3 engine. It is used to drive the gas to be measured around the NH3 vaporizer into the detection chamber according to the sampling command from the control and processing unit. The detection signal transmitting unit and the detection signal receiving unit are disposed opposite each other and located on opposite 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 command from the control and processing unit, so that the detection light signal passes through the gas to be measured in the detection chamber and is directed towards the detection signal receiving unit. The detection signal receiving unit is used to receive the detection light signal and generate an electro-inductive signal. The control and processing unit is used to determine the NH3 concentration of the gas to be measured based on the electro-inductive signal.

[0009] This invention achieves efficient and accurate detection of NH3 concentration around an NH3 vaporizer by integrating key components such as a sampling and collection assembly, a detection chamber, a detection signal transmission and reception unit, and a control and processing unit. The sampling and collection assembly actively collects the gas being tested, ensuring timely and representative detection. The detection signal transmission and reception unit uses a specific wavelength of light signal to pass through the gas in the detection chamber, generating an inductive signal related to the NH3 concentration, providing accurate data for subsequent processing. The control and processing unit processes the signal from the sensor to calculate the NH3 concentration, determining whether there is an NH3 leak in the vaporizer. The entire device is highly automated, easy to operate, and highly adaptable, capable of stable operation in complex marine environments. It can accurately detect NH3 leaks, ensuring the normal operation of marine NH3 engines and the safety of personnel.

[0010] In some embodiments, the sampling and collection assembly includes a vacuum pump and an air inlet pipe. The air inlet of the air inlet pipe is located around the NH3 vaporizer. The air inlet pipe is connected to the detection chamber. The vacuum pump is installed on the air inlet pipe to generate negative pressure inside the air inlet pipe.

[0011] By integrating a vacuum pump and an air intake pipe into the sampling and collection assembly, the device can actively and efficiently collect the gas to be measured around the NH3 vaporizer. The vacuum pump, located on the air intake pipe, generates negative pressure, overcoming the limitations of relying solely on natural gas diffusion and improving sampling efficiency and speed. The air inlet of the air intake pipe is located around the NH3 vaporizer, ensuring the accuracy and representativeness of the sampling and enabling timely detection of potential NH3 leaks. Furthermore, this design reduces interference from ambient air and prevents the mixing of other irrelevant gases, providing a pure and reliable gas sample for subsequent NH3 concentration detection. This improves the accuracy and reliability of the detection results and provides strong protection for the safe operation of marine NH3 engines.

[0012] In some embodiments, the sampling and collection assembly further includes a salt spray filtration unit disposed at the air inlet for filtering salt spray in the marine environment.

[0013] The technical solution described in the above embodiment incorporates a salt spray filter unit into the sampling and collection assembly, effectively addressing the complex marine environment. The salt spray filter unit is located at the air inlet, serving as the first line of defense against gas entering the sampling system. In the marine environment, salt spray is pervasive; if salt particles enter the detection system with the gas, they can clog pipes, contaminate components, and interfere with detection. The salt spray filter unit, using high-efficiency filter materials, accurately intercepts salt particles, allowing gas to pass smoothly while keeping salt out. This effectively prevents the adverse effects of salt spray on the detection process, avoids equipment corrosion and damage, extends the equipment's service life, ensures the stability and accuracy of the detection results, and enables the device to operate stably in the marine environment for extended periods, providing reliable assurance for the monitoring of marine NH3 engines.

[0014] In some embodiments, the device further includes a pressure sensor disposed in a detection chamber for detecting the pressure in the detection chamber. The pressure sensor is connected to a control processing unit, which is connected to a vacuum pump.

[0015] The technical solution described in the above embodiment introduces a pressure sensor and places it in the detection chamber, adding an important environmental monitoring function to the detection process. The pressure sensor can detect the pressure inside the detection chamber in real time and accurately, transmitting the pressure data to the control processing unit. Based on the pressure information, the control processing unit intelligently adjusts the operating status of the vacuum pump, such as adjusting the pumping rate or starting and stopping the vacuum pump, thereby precisely controlling the pressure inside the detection chamber and keeping it within the optimal detection range. This dynamic adjustment mechanism effectively avoids the impact of pressure fluctuations on NH3 concentration detection, improving the stability and accuracy of the detection. Simultaneously, the addition of the pressure sensor enhances the device's environmental adaptability, enabling it to operate stably under different pressure conditions, providing strong support for reliable monitoring of marine NH3 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 NH3 vaporizer and are connected to the control processing unit. The control processing unit is also used to compensate for the NH3 concentration of the gas being measured based on the temperature and humidity information.

[0017] The technical solution described in the above embodiment, equipped with temperature and humidity sensors positioned around the NH3 vaporizer, enables accurate acquisition of temperature and humidity information. These two environmental factors significantly affect the vaporization efficiency of NH3 and the properties of the measured gas. Based on this information, the control and processing unit compensates for the NH3 concentration, effectively eliminating detection errors caused by temperature and humidity changes. For example, increased temperature accelerates the movement of NH3 molecules, and increased humidity affects the absorption characteristics of NH3 molecules. The compensation algorithm adjusts the processing parameters of the detection signal according to the actual temperature and humidity conditions, making the detection results closer to the true value. This compensation mechanism significantly improves the accuracy and reliability of the detection, ensuring that the device provides accurate NH3 concentration data under different environmental conditions, providing strong support for the safe operation and performance monitoring of marine NH3 engines.

[0018] In some embodiments, the control processing unit is further configured to acquire the ship's acceleration information and compensate for the NH3 concentration of the gas being measured based on the acceleration information, temperature information, and humidity information.

[0019] The technical solution adopted in the above embodiments enables the device to more comprehensively cope with complex navigation environments. During navigation, changes in acceleration can alter the airflow velocity and distribution within the detection chamber, thereby affecting the interaction between NH3 molecules and the detection light signal, leading to detection errors. By introducing acceleration information, the control processing unit can accurately assess the impact of acceleration on the detection process and, combined with temperature and humidity data, use a comprehensive compensation algorithm to precisely correct the NH3 concentration. This multi-factor fusion compensation method effectively improves the stability and accuracy of the detection results, ensuring that the device can provide reliable NH3 concentration data under various navigation conditions, providing a more solid guarantee for the safe operation of marine NH3 engines.

[0020] In some embodiments, the control processing unit is specifically used to input acceleration information, temperature information and humidity information into a preset multi-source data fusion compensation model to obtain a compensation factor, and to compensate for the NH3 concentration of the measured gas based on the compensation factor.

[0021] The technical solution described in the above embodiments achieves intelligent compensation for NH3 concentration detection. This model is a complex algorithm that comprehensively considers the influence of multiple environmental factors. Through advanced algorithms such as deep learning and neural networks, it fuses information from different data sources to uncover the correlation between various factors and NH3 concentration detection errors. The compensation factor output by the model is a value that integrates the effects of acceleration, temperature, and humidity, reflecting the degree to which the NH3 concentration detection results need adjustment under current environmental conditions. Based on the correction using the compensation factor, the comprehensive errors caused by environmental factors can be eliminated, making the detection results more accurate. This process not only improves 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 NH3 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 transmission frequency of the detection signal transmission unit according to the operating status of the marine NH3 engine.

[0023] The technical solution described in the above embodiments achieves dynamic optimization of the detection process. When the NH3 engine is operating at high load, the consumption and emission of NH3 are significant. The control processing unit increases the sampling frequency and signal transmission frequency, enabling the device to collect gas samples and acquire detection data more frequently, promptly detecting potential NH3 leaks and ensuring the sensitivity and timeliness of the detection. Conversely, when the engine is under low load or shut down, the control processing unit reduces the sampling frequency and signal transmission frequency to reduce energy consumption and extend equipment lifespan, while ensuring the economic efficiency and rationality of the detection. This intelligent control strategy allows the device to closely coordinate with the operating status of the NH3 engine, improving detection efficiency and accuracy, and providing strong support for the safe and efficient operation of the engine.

[0024] In some embodiments, the device further includes a display screen connected to the control processing unit for displaying the detection results of the gas being measured.

[0025] The technical solution adopted in the above embodiments provides the device with an intuitive and convenient result display function. The control processing unit transmits the detected NH3 concentration data to the display screen, which clearly presents it in the form of numbers, charts, or graphs. The high-resolution, high-contrast display screen ensures accurate display of detection results under various lighting conditions. The real-time displayed NH3 concentration value allows operators to understand the current NH3 concentration level at a glance; the trend graph shows the change of NH3 concentration over time, providing a visual basis for analyzing engine operating status and carburetor performance. When an abnormal NH3 concentration is detected, the display screen can also alert the operator with a striking color or flashing mode, and display alarm information and emergency response prompts to guide the crew to take timely action. This design enhances the user experience and practicality of the device, providing convenient and intuitive information support for the monitoring and maintenance of marine NH3 engines.

[0026] In some embodiments, the device further includes an alarm unit connected to the control processing unit. When the NH3 concentration of the gas being measured is greater than a set threshold, the control processing unit controls the alarm unit to issue an alarm message indicating an abnormal NH3 concentration.

[0027] The technical solution described in the above embodiment adds an important safety early warning function to the device. When the detected NH3 concentration exceeds the set safety threshold, the control processing unit quickly activates the alarm program, controlling the alarm unit to issue an alarm message indicating an abnormal NH3 concentration. The combination of audible and visual alarms ensures that crew members can promptly perceive the alarm signal even in noisy shipboard environments. The rapid alarm sound and flashing red light quickly attract the crew's attention, while the specific alarm content and emergency response prompts provide clear action guidelines. This early warning mechanism effectively prevents safety accidents such as poisoning, fire, or explosion that may result from excessive NH3 concentration, ensuring the safety of the ship and crew, and building a solid defense for the safe operation of marine NH3 engines.

[0028] One or more technical solutions provided by this invention have at least the following technical effects or advantages:

[0029] 1. By actively collecting gas samples around the NH3 vaporizer using a sampling and collection component, and utilizing the optical signal detection principle of the detection signal transmission and reception unit, combined with intelligent data processing by the control and processing unit, the NH3 concentration can be accurately calculated. Simultaneously, the introduction of a multi-source data fusion compensation model, incorporating temperature, humidity, and acceleration, effectively eliminates the interference of environmental factors on the detection results, significantly improving the accuracy and reliability of the detection. This ensures accurate NH3 concentration data can be obtained under various environmental conditions, providing a solid data guarantee for the safe operation of marine NH3 engines.

[0030] 2. Achieving a high degree of automation, the control and processing unit not only handles data processing and concentration calculations but also intelligently adjusts the sampling and signal transmission frequencies based on the NH3 engine's operating status, optimizing the detection process. Furthermore, the device features an automatic alarm function, promptly issuing warnings when NH3 concentration exceeds the standard, reminding crew members to take appropriate measures. The display screen shows real-time detection results and related information, providing operators with an intuitive interface. This intelligent design significantly reduces the complexity and workload of manual operation, improving the device's usability and efficiency, making the monitoring of marine NH3 engines more convenient and efficient.

[0031] 3. The salt spray filtration unit in the sampling and collection assembly effectively addresses the salt spray problem in the marine environment, preventing salt particles from corroding and contaminating the detection elements, thus extending the service life of the device. The addition of a pressure sensor enables the device to monitor and adjust the air pressure in the detection chamber in real time, ensuring the stability of the detection process. Simultaneously, by setting safety thresholds and alarm units, the device can promptly issue warnings when NH3 concentrations are abnormal, preventing potential safety accidents and ensuring the safety of the ship and crew. These designs enable the device to operate stably and continuously in the complex and ever-changing marine environment, providing strong support for the safe use of marine NH3 engines and contributing to the green and safe development of the shipping industry. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of a marine NH3 automatic collection and detection device according to an embodiment of the present invention;

[0034] Figure 2 This is a unit connection diagram of a marine NH3 automatic collection and detection device according to an embodiment of the present invention. Detailed Implementation

[0035] The terminology used in the following embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the invention, the singular expressions “a,” “an,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in the invention refers to any or all possible combinations comprising one or more of the listed items.

[0036] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0037] It should also be noted that, unless otherwise explicitly specified and limited, the terms "setting" and "connection" in the embodiments of the present invention should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components; it can be a wired communication connection or a wireless communication connection. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances. The embodiments of the present invention will be described in detail below.

[0038] This invention provides a marine NH3 automatic collection and detection device (hereinafter referred to as the device or detection device for ease of explanation), such as... Figure 1 As shown, it 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 connected to the sampling and collection component 1, the detection signal transmitting unit 3, and the detection signal receiving unit 4, respectively.

[0039] The sampling and collection component 1 is connected to the detection chamber 2. The sampling and collection component 1 is set around the NH3 vaporizer of the marine NH3 engine and is used to drive the gas to be tested around the NH3 vaporizer into the detection chamber 2 according to the sampling command of the control and processing unit 5.

[0040] Specifically, the sampling and collection component 1 is connected to the detection chamber 2 and arranged around the NH3 vaporizer of the marine NH3 engine, forming a highly efficient gas collection channel. When the control and processing unit 5 issues a sampling command, the sampling and collection component 1 responds quickly, activating its built-in micro-pump or fan to generate negative pressure or airflow, precisely drawing the gas to be measured around the NH3 vaporizer into the collection pipe. This gas flows rapidly within the pipe, undergoing preliminary dust removal and dehumidification pretreatment to eliminate interference from particulate matter and moisture, before being smoothly introduced into the detection chamber 2. The gas environment within the detection chamber 2 is relatively stable, providing favorable conditions for subsequent signal transmission and reception, ensuring the accuracy and reliability of NH3 concentration detection. Through this design, the sampling and collection component 1 can promptly detect minute NH3 leaks around the NH3 vaporizer, laying a solid foundation for real-time monitoring and safety assurance of the NH3 engine's operating status.

[0041] The detection signal transmitting unit 3 and the detection signal receiving unit 4 are arranged opposite to each other and are located on both sides of the detection chamber 2 respectively. The detection signal transmitting unit 3 is used to transmit a detection light signal of a preset wavelength according to the detection command of the control processing unit 5, so that the detection light signal passes through the gas to be measured in the detection chamber 2 and is directed to the detection signal receiving unit 4. The detection signal receiving unit 4 is used to receive the detection light signal and generate an inductive signal.

[0042] Specifically, the detection signal transmitting unit 3 and the detection signal receiving unit 4 are positioned opposite each other on both sides of the detection chamber 2, forming a straight optical path to ensure that the detection light signal can pass unobstructed through the gas being measured in the detection chamber 2. When the control processing unit 5 issues a detection command, the detection signal transmitting unit 3 immediately starts, emitting a beam of detection light signal of a preset wavelength using a built-in laser or a light source of a specific wavelength. The detection light signal travels along the set optical path through the gas being measured in the detection chamber 2, interacting with gas molecules during this process, such as through absorption and scattering, thereby carrying gas concentration information. At the same time, the detection signal receiving unit 4 is ready at the other end of the optical path. When the detection light signal arrives, its built-in photodetector (such as a photodiode, photomultiplier tube, etc.) responds quickly, converting the received light signal into an inductive signal. The intensity of this inductive signal is closely related to the concentration of NH3 in the gas being measured, providing a crucial basis for subsequent concentration calculations and data analysis.

[0043] Through this carefully designed optical signal transmission and reception mechanism, the device can achieve non-contact, high-precision detection of NH3 concentration, is unaffected by electromagnetic interference, and has the advantages of fast response speed and high sensitivity.

[0044] In this embodiment, the wavelength for detecting the optical signal is typically selected in the infrared band where NH3 molecules exhibit characteristic absorption peaks. NH3 molecules have multiple characteristic absorption peaks in the infrared region, one of which is a significant peak located in the mid-infrared band, approximately around 10 micrometers (10,000 nanometers), specifically between 9.5 and 10.5 micrometers. This absorption peak within this wavelength range is primarily due to the vibrational modes of NH3 molecules, exhibiting high selectivity and sensitivity, and effectively distinguishing NH3 from other gas molecules.

[0045] The control processing unit 5 is used to determine the NH3 concentration of the gas being measured based on the inductive signal. Specifically, after receiving the inductive signal from the detection signal receiving unit 4, the control processing unit 5 first preprocesses the signal, including filtering and amplification, to eliminate noise interference and extract the effective signal components. Then, based on the attenuation of the light signal emitted by the detection signal transmitting unit 3 at a preset wavelength as it passes through the gas being measured, the Beer-Lambert Law is used. This law states that the attenuation of the light signal is directly proportional to the gas concentration, i.e., A = ∈·c·l, where A is the absorbance (related to the intensity of the inductive signal), ∈ is the molar absorptivity (related to the molecular properties of NH3), c is the gas concentration, and l is the optical path length.

[0046] The control processing unit 5 calculates the NH3 concentration c of the gas being measured by substituting the pre-calibrated molar absorptivity ∈ of NH3 at this wavelength and the known optical path length l into the above formula.

[0047] This embodiment employs the aforementioned device design, actively collecting the gas to be tested around the NH3 vaporizer via the sampling and collection component 1. This ensures timely and accurate detection, avoiding detection delays and errors caused by NH3 diffusion. The design of the detection chamber 2 provides a stable detection environment for the gas to be tested, enabling the detection signal transmitting unit 3 and the detection signal receiving unit 4 to accurately transmit and receive light signals. The photoelectric sensing signal generated after the detection light signal of a preset wavelength passes through the gas to be tested is used to control the processing unit 5 to accurately calculate the NH3 concentration. This process is unaffected by external environmental interference, improving detection sensitivity and reliability. Simultaneously, the automated design of this embodiment reduces the complexity and risk of manual operation, lowers maintenance costs, and improves work efficiency. This embodiment addresses the issue of unreliable sealing of the NH3 vaporizer under high temperature and high pressure environments, effectively and accurately detecting the NH3 concentration to determine whether the NH3 vaporizer is leaking. While ensuring the normal operation of the marine NH3 engine, it effectively prevents the threat to the safety of shipboard personnel from NH3 leakage.

[0048] In this embodiment, the control processing unit 5 is the core of the marine NH3 automatic collection and detection device, and is responsible for key tasks such as data processing, signal control and decision execution.

[0049] The control processing unit 5 can use a high-performance industrial-grade microprocessor or embedded system as the main control chip, such as the ARM Cortex series, Intel Atom series, or Xilinx FPGA. These processors have powerful data processing capabilities and real-time performance, enabling them to efficiently process large amounts of data from sensors and make rapid control decisions. It also needs to be equipped with sufficient storage devices, such as flash memory, random access memory (RAM), and hard disk drives (HDDs) or solid-state drives (SSDs), to store detection data, program code, historical records, and other information, ensuring data reliability and integrity.

[0050] Meanwhile, the control processing unit 5 also needs to integrate various 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 screen 91, alarm unit 92, and other external devices.

[0051] To improve system stability and reliability, a high-quality power management module should be selected to provide a stable power supply for the control processing unit 5, and it should also have overload protection and short-circuit protection functions. During hardware design, the special characteristics of the marine environment, such as shock resistance, moisture resistance, and corrosion resistance, must be fully considered. A housing and components with good protective performance should be selected to ensure that the control processing unit 5 can operate stably for a long time under harsh marine conditions.

[0052] In some embodiments, the sampling and collection assembly 1 includes a vacuum pump 11 and an air inlet pipe 12. The air inlet 121 of the air inlet pipe 12 is located around the NH3 vaporizer. The air inlet pipe 12 is connected to the detection chamber 2. The vacuum pump 11 is installed on the air inlet pipe 12 to generate negative pressure inside the air inlet pipe 12.

[0053] The air inlet 121 of the air inlet pipe 12 is located in the surrounding area of ​​the NH3 vaporizer. This maximizes the capture of NH3 gas that may leak from the vaporizer, ensuring the accuracy and representativeness of the sampling. The other end of the air inlet pipe 12 is closely connected to the detection chamber 2, providing a direct channel for the gas to be tested to the detection area, allowing the gas to smoothly enter the detection chamber 2 for subsequent detection and analysis.

[0054] The vacuum pump 11 is the core power unit of the sampling and collection assembly 1, and is installed on the inlet pipe 12. When it starts working, the vacuum pump 11 draws gas from the inlet pipe 12, creating a negative pressure inside the pipe. This negative pressure effect can generate a sufficiently strong suction force to actively draw the gas around the NH3 vaporizer into the inlet pipe 12, overcoming the limitations of relying solely on natural gas diffusion and greatly improving the efficiency and speed of sampling. At the same time, the generation of negative pressure also helps to reduce the interference of ambient air on the sampling process, avoids the mixing of other irrelevant gases, and ensures the purity of the gas being measured and the reliability of the detection results.

[0055] Through this structural design and working principle, the sampling and collection component 1 can stably and efficiently deliver the gas to be measured to the detection chamber 2, laying a solid foundation for the accurate detection of NH3 concentration.

[0056] Furthermore, in some embodiments, the sampling and collection assembly 1 further includes a salt spray filtration unit 13, which is disposed at the air inlet 121 and is used to filter salt spray in the marine environment.

[0057] This embodiment takes into account the marine environment, where salt spray is prevalent. If salt particles from this spray enter the detection system along with the gas, they may have many adverse effects on the subsequent detection process, such as clogging the air intake pipe 12, contaminating the detection elements, and interfering with the transmission of optical signals, thereby reducing the accuracy of the detection and the service life of the equipment. The addition of the salt spray filter unit 13 effectively solves this problem.

[0058] The salt spray filtration unit 13 employs high-efficiency filtration materials, such as specially designed filter screens or cartridges, including activated carbon, glass fiber, polytetrafluoroethylene, and polypropylene. These materials have a dense network of tiny pores on their surfaces, enabling precise interception and adsorption of salt particles in the salt spray, allowing gas to pass through smoothly while keeping salt out. As a result, the gas being tested after treatment by the salt spray filtration unit 13 becomes relatively pure, no longer containing large amounts of salt impurities. This provides a favorable gas environment for subsequent NH3 detection, ensuring the reliability of the test results and the long-term stable operation of the equipment. This fully demonstrates the invention's comprehensive consideration and ingenious response to the unique environmental factors at sea.

[0059] In some embodiments, such as Figure 1 and Figure 2 As shown, the detection device in this embodiment also includes one or more of the following: a pressure sensor 6, a temperature sensor 7, a humidity sensor 8, a display screen 91, and an alarm unit 92.

[0060] The pressure sensor 6 is installed in the detection chamber 2 to detect the pressure in the detection chamber 2. The pressure sensor 6 is connected to the control processing unit 5, and the control processing unit 5 is connected to the vacuum pump 11.

[0061] As the core area for gas detection, the stability of the internal air pressure in detection chamber 2 directly affects the accuracy and reliability of the detection results. The air pressure sensor 6, through its high-precision sensing element, can sensitively capture minute changes in air pressure within detection chamber 2, accurately sensing both fluctuations during gas collection and changes in external environmental air pressure.

[0062] The pressure sensor 6 is closely connected to the control processing unit 5, transmitting the detected pressure data to the control processing unit 5 in real time. Upon receiving the pressure data, the control processing unit 5 quickly analyzes and processes it to determine whether the current pressure is within a set reasonable range. If the pressure is too high or too low, the control processing unit 5 immediately activates the corresponding adjustment mechanism, where its connection with the vacuum pump 11 plays a crucial role.

[0063] The control processing unit 5 sends adjustment commands to the vacuum pump 11 to precisely control the working state of the vacuum pump 11, such as adjusting the pumping speed or starting and stopping the vacuum pump 11, thereby changing the negative pressure in the air inlet pipe 12 and thus affecting the air pressure in the detection chamber 2.

[0064] Through this intelligent linkage, the detection device can always maintain stable air pressure in detection chamber 2, creating favorable environmental conditions for accurate detection of NH3 concentration, ensuring that the detection results are not affected by air pressure fluctuations, greatly improving the detection performance and adaptability of the device, and enabling it to operate stably and reliably in complex and ever-changing marine environments.

[0065] Temperature sensor 7 is used to detect temperature information, and humidity sensor 8 is used to detect humidity information. Both temperature sensor 7 and humidity sensor 8 are located around the NH3 vaporizer and are connected to control processing unit 5. Control processing unit 5 is also used to compensate for the NH3 concentration of the measured gas based on the temperature and humidity information.

[0066] Temperature sensor 7 and humidity sensor 8 are important environmental monitoring components in the marine NH3 automatic collection and detection device of this invention, and they are both arranged in the surrounding area of ​​the NH3 vaporizer. This embodiment considers that during the operation of the NH3 vaporizer, the temperature and humidity conditions around it directly affect the vaporization efficiency of NH3 and the properties of the measured gas, thus significantly impacting the NH3 concentration detection results. Temperature sensor 7 uses a high-precision temperature-sensing element, capable of accurately sensing temperature changes around the NH3 vaporizer in real time, sensitively capturing both fluctuations in ambient temperature and heat generated during vaporizer operation. Humidity sensor 8 utilizes advanced humidity sensing technology to accurately measure the water vapor content in the surrounding air, promptly acquiring humidity information. The temperature and humidity data acquired by these two sensors are transmitted to the control processing unit 5 in real time through a stable connection.

[0067] The control and processing unit 5 uses a built-in compensation algorithm to accurately compensate for the NH3 concentration of the measured gas based on the received temperature and humidity information and the physicochemical properties of NH3. This is because changes in temperature and humidity may alter the diffusion rate and absorption spectrum characteristics of NH3 molecules, thereby affecting the accuracy of the detection signal.

[0068] Through compensation processing, the control processing unit 5 can eliminate the errors caused by these environmental factors, ensuring that the detected NH3 concentration value is closer to the true value, significantly improving the reliability and accuracy of the detection results, and providing strong support for the safe operation and performance monitoring of marine NH3 engines.

[0069] In some embodiments, the control processing unit 5 is further configured to acquire the ship's acceleration information and compensate for the NH3 concentration of the gas being measured based on the acceleration information, temperature information, and humidity information.

[0070] It is noted that ships inevitably experience various acceleration changes during navigation, such as acceleration and deceleration. These acceleration fluctuations will cause changes in the airflow velocity and distribution in the detection chamber 2, which in turn affects the interaction between NH3 molecules and the detection light signal, resulting in deviations in the detection results.

[0071] The control processing unit 5 is connected to the ship's navigation system or accelerometer to acquire accurate acceleration information in real time. Combined with existing temperature and humidity information, the control processing unit 5 uses a pre-defined compensation algorithm to comprehensively consider the effects of acceleration, temperature, and humidity on the NH3 detection process.

[0072] For example, changes in acceleration may affect the diffusion coefficient of NH3 molecules, an increase in temperature will accelerate the movement of NH3 molecules, and an increase in humidity may alter the absorption characteristics of the gas being measured or NH3 molecules. Based on the interaction of these factors, the control and processing unit 5 dynamically adjusts the processing parameters of the detection signal to accurately compensate for the NH3 concentration.

[0073] This embodiment, through extensive prior experiments, has obtained sufficient experimental data and algorithm optimization to ensure the accuracy and stability of the compensation effect. Through this comprehensive compensation mechanism, this embodiment can consistently provide accurate and reliable NH3 concentration detection results under various complex navigation conditions, providing solid data support for the safe operation and performance optimization of marine NH3 engines, fully demonstrating the core value and technological innovation of the control and processing unit 5 in the device.

[0074] Furthermore, the control processing unit 5 is specifically used to input acceleration information, temperature information and humidity information into a preset multi-source data fusion compensation model to obtain a compensation factor, and to compensate for the NH3 concentration of the measured gas based on the compensation factor.

[0075] Among them, the multi-source data fusion compensation model is a complex algorithm model that comprehensively considers the impact of various environmental factors on NH3 detection. Through deep learning, neural networks and other algorithms, it fuses information from different data sources and discovers the correlation between various factors and NH3 concentration detection errors.

[0076] The source data fusion compensation model performs a series of calculations and analyses, such as weighted fusion and error correction, ultimately outputting a precise compensation factor. This compensation factor is a value that integrates the effects of acceleration, temperature, and humidity, reflecting the degree to which the NH3 concentration detection results need to be adjusted under the current environmental conditions.

[0077] The control processing unit 5 then corrects the detected NH3 concentration value based on this compensation factor. The correction process typically involves multiplying or adding the original detected concentration to the compensation factor to obtain the compensated NH3 concentration value, thereby eliminating detection errors caused by environmental factors and ensuring the accuracy and reliability of the detection results.

[0078] This process not only improves detection accuracy but also enhances the device's adaptability to complex marine environments, providing strong technical support for the stable operation and performance monitoring of marine NH3 engines.

[0079] In this embodiment, the construction and training process of the multi-source data fusion compensation model is as follows:

[0080] 1) Collect historical data: A large amount of historical data is collected during the actual operation of the marine NH3 engine, including NH3 concentration detection data, acceleration data, temperature data, and humidity data. This data can be obtained from sensor records, equipment logs, and maintenance reports.

[0081] 2) Synchronized Data: Ensure that the collected data of all types are synchronized in time, that is, each NH3 concentration detection data has corresponding acceleration, temperature, and humidity data. This allows for accurate analysis of the impact of different environmental factors on NH3 concentration detection.

[0082] 3) Data preprocessing: The collected raw data is cleaned and preprocessed to remove outliers, noise, and missing values. For example, noise in acceleration data can be removed using filtering algorithms, and missing values ​​in temperature or humidity data can be filled using interpolation methods to improve data quality and usability.

[0083] 4) Feature Extraction: Extract features from the raw data that are helpful for model learning. For acceleration data, features such as the magnitude and rate of change of acceleration can be extracted; for temperature and humidity data, features such as the absolute value of temperature, rate of change, and relative value of humidity can be extracted. Additionally, it is worth considering constructing some cross-features, such as the interaction features between acceleration and temperature, to capture the complex relationships between different factors.

[0084] 5) Feature selection: Through correlation analysis and feature importance assessment, the features most influential on NH3 concentration detection compensation are selected. Redundant and irrelevant features are eliminated to reduce model complexity and improve training efficiency.

[0085] 6) Feature normalization: Normalize the extracted features to bring them into the same dimension, facilitating model training and learning. Commonly used normalization methods include min-max normalization and Z-score normalization.

[0086] 7) Selecting an appropriate model: Based on the characteristics of the problem and the nature of the data, select a model suitable for multi-source data fusion and compensation. Commonly used models include neural networks, support vector machines, random forests, and Bayesian networks. Neural networks have powerful nonlinear mapping capabilities and adaptive learning capabilities, making them suitable for handling complex multi-factor interactions; support vector machines perform well in small sample situations and are suitable for handling high-dimensional data; random forests have good robustness and interpretability, making them suitable for handling large-scale data.

[0087] 8) Determine the model structure: For neural network models, it is necessary to determine structural parameters such as the number of layers, the number of neurons in each layer, and the type of activation function. For support vector machine models, it is necessary to select appropriate kernel functions 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.

[0088] 9) Divide the dataset into training and test sets: Typically, 70% of the data is used as the training set and 30% as the test set. The training set is used for model training, and the test set is used for model evaluation and validation.

[0089] 10) Training the Model: Train the selected model using the training set data. Adjust the model's parameters using optimization algorithms (such as gradient descent, genetic algorithms, etc.) to achieve the best fit on the training data. For example, when training a neural network, update the network's weights and biases using the backpropagation algorithm to make the network's output as close as possible to the actual NH3 concentration value.

[0090] 11) Cross-validation: During training, cross-validation is used to validate the model and 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 validated multiple times, and the average result is taken as the model's performance metric.

[0091] 12) Evaluation Metrics: Select appropriate evaluation metrics to measure model performance. Commonly used evaluation metrics include mean squared error (MSE), root mean square error (RMSE), mean absolute error (MAE), and coefficient of determination (R²). 2 These indicators can reflect the accuracy and stability of the model in predicting NH3 concentrations.

[0092] 13) Test Model: Test the trained model using test set data and calculate the model's evaluation index value on the test set. By comparing the test results of different models, select the model with the best performance as the final multi-source data fusion compensation model.

[0093] 14) Model Optimization: Based on the model evaluation results, further optimize the model. This can involve adjusting the model's structural parameters, training algorithm parameters, etc., to improve the model's prediction accuracy and generalization ability. For example, the number of layers or neurons in the neural network can be increased, the kernel parameters of the support vector machine can be adjusted, or the number and depth of trees in the random forest can be changed.

[0094] In some embodiments, the control processing unit 5 can also compensate for the NH3 concentration according to a concentration detection compensation formula. The concentration detection compensation formula includes:

[0095]

[0096] Where C represents the compensated NH3 concentration, C m This represents the detected NH3 concentration.

[0097] 'a' represents the ship's acceleration information.

[0098] T represents temperature information.

[0099] T0 represents the reference temperature, which is usually set to the ambient temperature when the NH3 vaporizer is working normally, such as 20℃, 25℃, etc.

[0100] H represents humidity information.

[0101] H0 represents the reference humidity, which is usually set to the ambient humidity when the NH3 vaporizer is working normally, such as 50%, 60%, etc.

[0102] α is the acceleration compensation coefficient, which represents the degree of influence of acceleration on NH3 concentration detection. It is expressed in exponential form to reflect the effect of acceleration changes on airflow velocity and NH3 diffusion rate.

[0103] β and δ represent the linear influence coefficients of temperature and humidity changes on NH3 concentration detection, respectively, and are used to adjust the degree of influence of temperature and humidity changes relative to the reference value on the detection results.

[0104] γ and η represent the nonlinear influence indices of temperature and humidity changes on NH3 concentration detection, respectively, and are used to describe the degree of nonlinearity of the influence of temperature and humidity changes on NH3 concentration detection.

[0105] This embodiment collects NH3 concentration detection data and actual concentration data under different acceleration, temperature, and humidity conditions through experiments or data analysis. Using nonlinear fitting methods, such as least squares method and gradient descent method, the optimal coefficients α, β, γ, δ, and η are fitted based on the collected data, so that the formula can fit the actual NH3 concentration detection data to the greatest extent.

[0106] Among them, the nonlinear exponential compensation form provides a more flexible compensation method for temperature and humidity changes, which can better describe their complex impact on NH3 concentration detection and improve the reliability and accuracy of detection results.

[0107] In some embodiments, the control processing unit 5 is further configured to control the sampling frequency of the sampling collection component 1 and the signal transmission frequency of the detection signal transmission unit 3 according to the operating status of the marine NH3 engine.

[0108] Specifically, when the NH3 engine is operating under high load, the consumption and emission of NH3 are relatively large, making NH3 leakage more likely in the NH3 carburetor. At this time, the control processing unit 5 receives a high-load signal from the engine operation status monitoring system and immediately analyzes and determines that the sensitivity and timeliness of detection need to be improved. Therefore, the control processing unit 5 sends a command to the sampling and collection assembly 1 to increase the sampling frequency, causing the vacuum pump 11 to operate at a higher frequency and accelerating the extraction speed of gas in the intake pipe 12. This allows for more frequent collection of gas samples around the NH3 carburetor, ensuring that any potential NH3 leakage can be detected promptly.

[0109] At the same time, the control processing unit 5 will also increase the signal transmission frequency of the detection signal transmission 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 acquired per unit time and improving the accuracy and reliability of the detection results.

[0110] Conversely, when the NH3 engine is under low load or shut down, the emission of NH3 is relatively small, and the probability of NH3 leakage from the NH3 carburetor is relatively low. The control processing unit 5 will correspondingly reduce the sampling frequency and signal transmission frequency to reduce energy consumption and extend equipment lifespan, while ensuring the economic efficiency and rationality of the detection.

[0111] Through this intelligent control strategy, the device can closely coordinate with the operating status of the NH3 engine to achieve precise control over the NH3 concentration detection process, providing strong support for the safe and efficient operation of marine NH3 engines.

[0112] In some embodiments, the display screen 91 is connected to the control processing unit 5 and is used to display the detection results of the gas being tested.

[0113] Specifically, after completing the precise calculation and compensation of the concentration of the measured gas NH3, the control and processing unit 5 transmits the final detection data to the display screen 91 in the form of numbers, charts, or graphs. The display screen 91 employs high-resolution, high-contrast display technology to ensure clear display of the detection results under various lighting conditions. For example, it can display the NH3 concentration value in real time, typically in ppm (parts per million) or mg / m³. 3(mg / m³) allows operators to clearly understand the current NH3 concentration level at a glance. Furthermore, display screen 91 can also present a trend graph of NH3 concentration changes over time, showing fluctuations in NH3 concentration at different time periods through line graphs or curves, providing a visual basis for analyzing the operating status of the NH3 engine and the performance of the carburetor. When an abnormally high NH3 concentration is detected, display screen 91 can promptly alert operators with a prominent color (such as red) or by flashing, and may also display alarm information and corresponding emergency response prompts, such as "NH3 concentration exceeds the standard, please check the carburetor seal," ensuring that the crew can respond quickly and take appropriate measures to ensure the safe operation of the ship.

[0114] The design of the display screen 91 takes into full account the special characteristics of the marine environment, and has good shockproof, moisture-proof and corrosion-proof performance, ensuring that it can work stably and reliably under harsh marine conditions, providing convenient and intuitive information support for the monitoring and maintenance of marine NH3 engines.

[0115] In some embodiments, the alarm unit 92 is connected to the control processing unit 5. When the NH3 concentration of the gas being measured is greater than a set threshold, the control processing unit 5 controls the alarm unit 92 to issue an alarm message indicating an abnormal NH3 concentration.

[0116] Specifically, the control processing unit 5 monitors and analyzes the NH3 concentration data of the gas being tested in real time and compares it with a preset safety threshold. This threshold is determined based on factors such as the hazardous concentration limit of NH3, ship safety standards, and engine operating requirements. Once the detected NH3 concentration exceeds this preset threshold, it indicates a possible NH3 leak or other abnormal situation. At this time, the control processing unit 5 will immediately activate the alarm procedure and send a command to the alarm unit 92.

[0117] Upon receiving the instruction, alarm unit 92 quickly issues a clear alarm message, typically in the form of both audible and visual alarms. Audible alarms emit a rapid, loud sound, such as a buzzer or siren, ensuring the crew's attention is drawn even in noisy shipboard environments. Visual alarms provide a visual warning through flashing red lights or other warning lights, enabling the crew to quickly identify the alarm status.

[0118] The alarm message may also include specific alarm content, such as "NH3 concentration exceeds the standard" or "NH3 leak in the detection area", as well as possible emergency measures prompts to guide the crew to take timely action, such as activating the emergency ventilation system, closing relevant valves, and evacuating personnel, in order to prevent the NH3 concentration from rising further, avoid possible poisoning, fire or explosion and other safety accidents, and ensure the safety of the ship and crew.

[0119] Through this automated alarm mechanism, the device can respond promptly to abnormal NH3 concentrations, providing strong protection for the safe operation of marine NH3 engines.

[0120] The marine NH3 automatic collection and detection device of this invention achieves efficient and accurate detection of NH3 concentration around the NH3 vaporizer through key components such as the sampling and collection component 1, the detection chamber 2, the detection signal transmission and reception unit, and the control and processing unit 5. The sampling and collection component 1 cleverly combines a vacuum pump 11 and an air inlet pipe 12 to actively collect the gas being tested, ensuring the timeliness and representativeness of the detection. The salt spray filtration unit 13 effectively intercepts salt spray particles from the sea, protecting the detection element from contamination. The detection signal transmission and reception unit uses a light signal of a specific wavelength to pass through the gas in the detection chamber 2, generating an electro-inductive signal related to the NH3 concentration, providing accurate data for subsequent processing.

[0121] The control processing unit 5 not only processes temperature, humidity, and acceleration information from sensors, but also integrates a multi-source data compensation model to dynamically calculate compensation factors, accurately correcting the NH3 concentration and eliminating environmental interference to accurately detect whether the NH3 vaporizer is leaking. Furthermore, the display screen 91 intuitively presents the detection results, and the alarm unit 92 issues timely warnings when the concentration exceeds the standard, ensuring ship safety.

[0122] The entire device is highly automated, easy to operate, and highly adaptable, 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.

[0123] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to 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 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 connected to the sampling and collection component, the detection signal transmitting unit, and the detection signal receiving unit, respectively. The sampling and collection component is connected to the detection chamber. The sampling and collection component is set around the NH3 vaporizer of the marine NH3 engine. It is used to drive the gas to be tested around the NH3 vaporizer into the detection chamber according to the sampling command 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 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 command of the control processing unit, so that the detection light signal passes through the gas to be measured in the detection chamber and is directed 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 gas being measured based on the photoelectric sensing signal; The device also 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 NH3 vaporizer and are connected to the control processing unit. The control processing unit is also used to compensate for the NH3 concentration of the gas being measured based on the temperature information and the humidity information. The control processing unit is also used to acquire the ship's acceleration information, 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 the NH3 concentration of the gas being measured based on the compensation factor; The construction and training process of the multi-source data fusion compensation model includes: A large amount of historical data was collected during the actual operation of marine NH3 engines, including NH3 concentration detection data, acceleration data, temperature data, and humidity data. It was ensured that the collected data types were synchronized over time. The raw data was cleaned and preprocessed. Features helpful for model learning were extracted from the raw data, including the magnitude and rate of change of acceleration, the absolute value and rate of change of temperature, and the relative value of humidity. Cross-features were constructed, including the interaction features between acceleration and temperature, to capture the complex relationships between different factors. Through correlation analysis and feature importance assessment, the features most influential on NH3 concentration detection compensation were selected. The extracted features were normalized. A suitable model was selected, the model structure was determined, training and testing sets were divided, the model was trained, cross-validated, evaluation metrics were established, the model was tested, and the model was optimized. The sampling and collection assembly includes a vacuum pump and an air inlet pipe. The air inlet of the air inlet pipe is located around the NH3 vaporizer. The air inlet pipe is connected to the detection chamber. The vacuum pump is installed on the air inlet pipe to generate negative pressure inside the air inlet pipe. The sampling and collection assembly also includes a salt spray filtration unit, which is disposed at the air inlet and is used to filter salt spray in the marine environment. The control processing unit is also used to compensate for the NH3 concentration according to the concentration detection compensation formula; wherein the concentration detection compensation formula includes: Where C represents the compensated NH3 concentration, C m The values ​​represent: α represents the detected NH3 concentration; 'a' represents the ship's acceleration information; 'T' represents the temperature information; 'T0' represents the reference temperature, usually set to the ambient temperature when the NH3 vaporizer is operating normally; 'H' represents the humidity information; 'H0' represents the reference humidity, usually set to the ambient humidity when the NH3 vaporizer is operating normally; 'α' is the acceleration compensation coefficient, indicating the degree of influence of acceleration on NH3 concentration detection, expressed in exponential form, reflecting the influence of acceleration changes on airflow velocity and NH3 diffusion rate; 'β' and 'δ' represent the linear influence coefficients of temperature and humidity changes on NH3 concentration detection, respectively, used to adjust the degree of influence of temperature and humidity changes relative to the reference value on the detection results; 'γ' and 'η' represent the nonlinear influence exponents of temperature and humidity changes on NH3 concentration detection, respectively, used to describe the nonlinearity of the influence of temperature and humidity changes on NH3 concentration detection. The device also includes a pressure sensor, which is installed in the detection chamber to detect the pressure in the detection chamber. The pressure sensor is connected to the control processing unit, and the control processing unit is connected to the vacuum pump. The control processing unit is also used to adjust the pumping speed or start / stop status of the vacuum pump according to the air pressure data detected by the air pressure sensor, so as to control the air pressure in the detection chamber to be maintained within a set detection range.

2. The apparatus 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 status of the marine NH3 engine.

3. The apparatus 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 results of the gas being tested.

4. The apparatus 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 gas being measured is greater than a set threshold, the control processing unit controls the alarm unit to issue an alarm message indicating an abnormal NH3 concentration.

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