A water-gas synchronous gas concentration detection device and detection method

Abstract

The present invention provides a gas concentration detection device and detection method for water-gas synchronization, wherein the gas concentration detection device comprises a shell, a balanced membrane assembly is arranged at the water inlet of the shell, a laser sensor is arranged inside the shell, the balanced membrane assembly and the laser sensor are cyclically connected to separate the gas and liquid of the water body to be tested and detect the concentration of each gas phase component in the gas; the laser sensor is externally connected to the gas sampling pipeline. The gas concentration detection system provided by the present invention can automatically complete the continuous measurement of the concentration of each gas component in the gas and water body, and realize the synchronous high-precision detection and analysis of the gas and water body in a relatively short time.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas detection, and relates to a gas concentration detection device and a detection method, and in particular to a water-gas synchronous gas concentration detection device and a detection method. Background Art

[0002] The environment is the basis for human survival. With the development of the world economy, environmental pollution has become increasingly serious, not only causing huge economic losses, but also gradually endangering the living environment of human beings. Therefore, environmental protection has become one of the research topics of many countries. Global climate change, greenhouse effect, the formation of photochemical smog, acid rain, the destruction of the ozone layer in the stratosphere, etc., all of which are affecting the living environment of human beings. Their formation is related to the concentration of trace gases in the atmosphere. For example: excessive combustion of coal, oil and natural gas causes the concentration of CO2 in the air to rise, causing the earth's surface to heat up, causing sea level rise, abnormal climate, land drought, etc., and also affects human functions, causing headaches, fatigue, vomiting, breathing difficulties and other poisoning symptoms; for example, due to the production and processing of petrochemical production, sewage / garbage treatment plants, gasoline engine exhaust, metallurgical industry, etc., and the processing and use of various chemical raw materials, as well as the incomplete combustion of organic matter such as wood and tobacco, the volatile organic compounds produced by the process will cause various discomforts to the human body due to their toxicity, irritation, and carcinogenicity. Trace pollutant gases in the atmosphere mainly include: CO2, CH4, N2O, NH3, SO2, C2H2, C2H4, C2H6, etc. Their concentrations are mainly in the ppm range. Accurate measurement of these trace gas components is very important for air pollution monitoring and control.

[0003] Atmospheric trace gas monitoring technology is mainly divided into chemical method and spectroscopy method. The traditional air pollution monitoring method is based on wet chemical technology and experimental analysis after air sampling, but due to its slow response and complex pretreatment process, it cannot meet the needs of real-time, online, and remote sensing monitoring of atmospheric pollutants. The gradually developed spectroscopy has obvious advantages in these aspects, mainly manifested in: easy to achieve completely non-contact online automatic monitoring, high sensitivity of the instrument, wide measurement range, can reflect the average pollution level of an area, easy maintenance of the system, etc. Spectroscopy uses the interaction characteristics of light and atmospheric pollution molecules for monitoring.

[0004] In recent years, several optical and spectral technologies with great application prospects in environmental pollution monitoring include: differential absorption spectroscopy technology in the ultraviolet to visible band, infrared band Fourier transform infrared spectroscopy technology for monitoring multiple pollutants, tunable diode laser absorption spectroscopy technology, differential absorption lidar technology, laser induced fluorescence technology, etc. Among these technologies, tunable diode laser absorption spectroscopy technology is increasingly widely used in the monitoring of trace gases in atmospheric pollution due to its high sensitivity, fast response time, and real-time online monitoring.

[0005] CN110470623A discloses a gas concentration detection system, including a main controller, a laser signal generating device, a signal separator, an optical fluctuation information extraction device and a gas concentration detection device. The main controller controls the laser information generating device to emit a laser signal of a preset wavelength, and obtains the gas concentration after removing the optical fluctuation interference by fitting the gas concentration data to be measured and the optical fluctuation data; the signal separator divides the laser signal into a first beam of optical signal and a second beam of optical signal, and emits them to the optical fluctuation information extraction device and the gas concentration detection device respectively; the optical fluctuation information extraction device uses the first beam of optical signal to extract the optical fluctuation information of the laser light source; and the gas concentration detection device uses the second beam of optical signal to measure the gas concentration of the gas to be measured.

[0006] CN204855367U discloses a laser spectrometer for detecting gas concentration, the laser spectrometer having: a laser, which is tunable within a certain width of wavelength range; a measuring volume, in which the gas to be measured is contained, and the gas to be measured has an absorption to be measured in the wavelength range; a first light detector; an evaluation and control unit, which is used to control the laser and evaluate the light intensity detected on the first light detector and thereby determine the gas concentration; and a device for calibrating the width of the wavelength range. In order to provide an improved laser spectrometer and method for detecting gas concentration, so that calibration can be performed more simply and as well as possible, it is proposed that the device for calibrating the width has an interferometer, at least a portion of the laser light is guided through the device and detected by the first light detector or another light detector, and the evaluation and control unit is designed to infer the calibration of the width of the wavelength range based on the generated interference signal.

[0007] CN108226094A discloses a gas concentration monitoring system, including a laser generating device, a microcontroller, a photoelectric detection device and a gas optical fiber sensor device. The microcontroller is electrically connected to the photoelectric detection device. The gas optical fiber sensor device is used to detect the gas to be measured. The laser generating device is used to output signal light. The signal light is transmitted to the gas optical fiber sensor device, a part of the signal light is absorbed by the gas to be measured in the gas optical fiber sensor device, and another part of the signal light is output from the gas optical fiber sensor device and transmitted to the photoelectric detection device. The photoelectric detection device is used to convert the received signal light into a first electrical signal and send the first electrical signal to the microcontroller.

[0008] However, currently known gas concentration detection devices can only detect gas concentrations in the atmosphere, but cannot detect gas concentrations in water bodies. However, synchronous water and gas detection is still in great demand in the field of environmental pollution monitoring. Summary of the invention

[0009] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a water-gas synchronized gas concentration detection device and detection method. The gas concentration detection device provided by the present invention can achieve synchronized high-precision detection of mixed gas and gas in water in a relatively short time.

[0010] To achieve this object, the present invention adopts the following technical solutions:

[0011] In the first aspect, the present invention provides a gas concentration detection device for synchronous navigation between sea and air, the gas concentration detection device comprising a shell, a balanced membrane assembly is arranged at the water inlet of the shell, a laser sensor is arranged inside the shell, the balanced membrane assembly and the laser sensor are cyclically connected for performing gas-liquid separation on the water body to be tested and detecting the concentration of each gas phase component in the gas; the laser sensor is externally connected to a gas collection pipeline.

[0012] The gas concentration detection device provided by the present invention can automatically complete the continuous measurement of the concentration of each gas component in the gas and water body, and realize the synchronous high-precision detection and analysis of the gas and water body in a relatively short time.

[0013] The working principle of the laser sensor provided by the present invention is that the gas molecules entering the laser sensor absorb the laser ions, and the concentrations of different gas components are obtained through the change of absorbance. The detection accuracy is improved by setting the laser sensor.

[0014] It should be noted that:

[0015] (1) The gas concentration detection device provided by the present invention realizes synchronous detection of water and gas. The synchronization here does not mean that water body detection and gas detection are carried out at the same time at a certain moment, but that water body detection and gas detection are completed separately within a shorter period of time. The detection frequency of water body detection and gas detection can be pre-programmed, and the detection process runs automatically after the setting is completed. For example, it can be set to perform 3 gas detections and 2 water body detections within an hour (since water body detection requires gas-liquid analysis in advance and cyclic stabilization for a period of time, theoretically the detection cycle of water body detection is longer). Gas detection and water body detection can be performed alternately or completed at one time. The specific setting method and detection frequency can be reasonably adjusted in combination with the usage scenario.

[0016] (2) The gas concentration detection device provided by the present invention has no specific requirements and special limitations on the type of gas to be detected. The gas to be detected is a mixed gas of multiple gases. After detection by the present invention, the content data of all single gas components in the gas to be detected can be output at one time.

[0017] (3) The water body detection described in the present invention refers to the detection of each gas component in the water body, rather than the detection of each component in the water body. Therefore, the present invention sets up a balanced membrane assembly to perform gas-liquid separation on the water body to be tested in advance. At the same time, it is found through multiple tests that one separation cannot extract all gas components in the water body, so it is necessary to perform multiple cycles of separation and extraction. By constructing a circulation pipeline between the balanced membrane assembly and the laser sensor, each time the gas flows through the balanced membrane assembly, it will diffuse with the water body to be tested on the membrane interception side driven by the concentration gradient, so that the gas concentration on both sides of the membrane tends to be stable. At this time, the test result of the laser sensor also tends to the temperature, which is the final measured result.

[0018] As a preferred technical solution of the present invention, the water inlet of the shell is connected to a water collection pipeline.

[0019] Preferably, the laser sensor is independently externally connected to the gas collection pipeline, the first standard gas pipeline and the second standard gas pipeline.

[0020] As a preferred technical solution of the present invention, a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve are further arranged inside the housing.

[0021] Preferably, the first valve inlet is independently connected to the balancing membrane assembly and the fourth valve, and the first valve outlet is connected to the second valve.

[0022] Preferably, the inlet of the second valve is independently connected to the first valve and the pressure relief pipeline, and the outlet of the second valve is connected to the laser sensor; a pressure reducing valve is arranged on the connecting pipeline between the second valve and the laser sensor.

[0023] Preferably, the inlet of the third valve is independently connected to the gas collection pipeline and the first standard gas pipeline, and the outlet of the third valve is connected to the fourth valve.

[0024] Preferably, the fourth valve inlet is independently connected to the third valve and the second standard gas pipeline, and the fourth valve outlet is connected to the first valve.

[0025] Preferably, the fifth valve inlet is connected to a laser sensor, and the fifth valve outlet is independently connected to an exhaust pipeline and a sixth valve.

[0026] Preferably, a conveying device is provided on the connecting pipeline between the laser sensor and the fifth valve.

[0027] Preferably, the sixth valve inlet is connected to the fifth valve, and the sixth valve outlet is respectively connected to the exhaust pipeline and the balancing membrane assembly.

[0028] As a preferred technical solution of the present invention, the first valve is a two-position three-way electromagnetic valve, and the first valve includes two working positions. When the first valve is switched to the first working position, it connects the balancing membrane assembly and the second valve. When the first valve is switched to the second working position, it connects the fourth valve and the second valve.

[0029] Preferably, the second valve is a two-position three-way solenoid valve, and the second valve includes two working positions. When the second valve is switched to the first working position, the first valve and the laser sensor are connected; when the second valve is switched to the second working position, the pressure relief pipeline and the laser sensor are connected.

[0030] Preferably, the third valve is a two-position three-way solenoid valve, and the third valve includes two working positions. When the third valve is switched to the first working position, the first standard gas pipeline and the fourth valve are connected; when the second valve is switched to the second working position, the gas production pipeline and the fourth valve are connected.

[0031] Preferably, the fourth valve is a two-position three-way electromagnetic valve, and the fourth valve includes two working positions. When the fourth valve is switched to the first working position, the second standard gas pipeline and the first valve are connected; when the third valve is switched to the second working position, the third valve and the first valve are connected.

[0032] Preferably, the fifth valve is a two-position three-way electromagnetic valve, and the fifth valve includes two working positions. When the fifth valve is switched to the first working position, the laser sensor and the exhaust pipe are connected; when the third valve is switched to the second working position, the laser sensor and the sixth valve are connected.

[0033] Preferably, the sixth valve is a two-position three-way solenoid valve, and the sixth valve includes two working positions. When the sixth valve is switched to the first working position, the fifth valve and the exhaust pipeline are connected; when the sixth valve is switched to the second working position, the fifth valve and the balancing membrane assembly are connected.

[0034] The present invention arranges a plurality of groups of electromagnetic valves, and realizes the independent operation of different process by switching the working positions of the electromagnetic valves, thereby ensuring that the synchronous detection and analysis of the gas concentration of water and gas is completed in a short time.

[0035] It can be understood that the first working position and the second working position defined in the present invention are not limitations of the two-position three-way valve, but are only a self-set naming method for the convenience of description, as long as the switching connection between different pipelines or equipment can be achieved after switching the valve.

[0036] As a preferred technical solution of the present invention, a data processing unit and a power supply unit are also provided inside the shell, the data processing unit is electrically connected to the gas analysis unit, and the data processing unit is used to receive and record the detection data transmitted by the gas analysis unit; the power supply unit is electrically connected to the data processing unit, and the power supply unit is used to supply power to the data processing unit.

[0037] In a second aspect, the present invention provides a method for detecting gas concentration synchronously with water and gas, using the gas concentration detection device synchronously with water and gas as described in the first aspect to synchronously analyze and detect the concentrations of various gas phase components in the gas and water, and the gas concentration detection method comprises:

[0038] The water body to be tested is passed into the gas concentration detection device, and the balanced membrane assembly separates the gas and liquid in the water body to be tested. The separated gas circulates between the balanced membrane assembly and the laser sensor. When the gas flows through the balanced membrane assembly, it undergoes equilibrium diffusion with the gas in the water body to be tested until the gas concentration tends to be stable, and then the laser sensor analyzes and detects the gas phase components in the gas; the gas to be tested is passed into the laser sensor through the gas sampling pipeline, and the gas phase components in the gas to be tested are analyzed and detected.

[0039] As a preferred technical solution of the present invention, the gas concentration detection method includes the following four independently running process: laser sensor calibration, water body detection, gas detection and detection result correction.

[0040] The laser sensor calibration process specifically includes:

[0041] The first standard gas pipeline introduces the first standard gas into the laser sensor to calibrate the laser sensor.

[0042] Preferably, the water body detection process specifically includes:

[0043] The water to be tested is sent into the gas concentration detection device through the water sampling pipeline. The water to be tested is separated into gas and liquid through the balanced membrane assembly. The separated gas circulates between the balanced membrane assembly and the laser sensor. When the gas flows through the balanced membrane assembly, the gas on both sides of the membrane assembly and the water to be tested are balanced and diffused until the laser sensor detects that the concentration of each gas phase component in the gas tends to be stable and then outputs the detection result. The gas is exhausted after the detection is completed.

[0044] In the present invention, the balanced membrane assembly only allows the gas in the water body to be tested to pass, such as methane, carbon dioxide and water vapor. The optional balanced membrane assembly is a silicon balanced membrane. When the water body to be tested flows through the balanced membrane assembly, gas-liquid separation occurs, but the effect of the gas-liquid separation is poor, which is not enough to filter and obtain most of the gases in the water body to be tested, thereby causing a deviation in the measurement result. Therefore, it is necessary to undergo a circulation filtration, and the pressure difference formed by the gas concentration gradient on both sides of the membrane assembly is used to complete the full separation of the water body to be tested and the gas. When the concentration of a certain component gas in the water body to be tested on one side of the membrane is higher than the concentration of the component gas on the other side of the membrane, under the action of the pressure difference, the component gas will diffuse and transfer from the water body to be tested on the interception side of the membrane to the filtration side of the membrane; when the concentration of a certain gas component in the water body to be tested on one side of the membrane is lower than the concentration of the component gas on the other side of the membrane, the component gas will diffuse and transfer from the filtration side of the membrane to the water body to be tested on the interception side, thereby obtaining a stable concentration of the gas component in the water body to be tested.

[0045] Preferably, the gas detection process specifically includes:

[0046] The gas to be tested is introduced into the laser sensor through the gas sampling pipeline, and the laser sensor analyzes each gas phase component in the gas to be tested and outputs the test results.

[0047] Preferably, the detection result correction process specifically includes:

[0048] The second standard gas is passed into the laser sensor through the second standard gas pipeline. The difference between the actual measured result of the second standard gas and the standard value is the detection error. The detection error is calculated based on the detection result output during the water body detection process or the gas detection process to obtain the corrected detection result, and the corrected detection result is transmitted to the data processing unit.

[0049] Exemplarily, the detection result correction method described in the present invention means that if a 200ppm standard gas is measured and the measurement result obtained by the laser sensor is 201ppm, then 1ppm can be added to the result when the actual measured data is processed.

[0050] As a preferred technical solution of the present invention, independent operation of different process steps is achieved by switching the working position of the valve in the gas concentration detection device.

[0051] Preferably, the following methods are used to achieve independent operation of different process steps:

[0052] (I) The second valve, the third valve, the fifth valve and the sixth valve are switched to the first working position, the first valve and the fourth valve are switched to the second working position, the first standard gas pipeline is connected to the laser sensor inlet, and the laser sensor outlet is connected to the exhaust pipeline, and the laser sensor is calibrated;

[0053] (II) The first valve and the second valve are switched to the first working position, the fifth valve and the sixth valve are switched to the second working position, the balance membrane assembly and the laser sensor are circulated and connected to perform water body detection, after the detection, the fifth valve and the sixth valve are switched to the first working position, the outlet of the laser sensor is switched and connected to the exhaust pipeline, and the pipeline is exhausted;

[0054] (III) The first valve, the third valve and the fourth valve are switched to the second working state, the second valve, the fifth valve and the sixth valve are switched to the first working state, the gas collection pipeline is connected to the laser sensor inlet, and the laser sensor outlet is connected to the exhaust pipeline for gas detection;

[0055] (IV) The second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are switched to the first working position, the first valve is switched to the second working position, the second standard gas pipeline is connected to the inlet of the laser sensor, and the outlet of the laser sensor is connected to the exhaust pipeline to calibrate the detection results.

[0056] As a preferred technical solution of the present invention, the gas concentration detection method also includes periodic pipeline pressure relief.

[0057] Preferably, the switching mode of the valve working position during the periodic pressure relief of the pipeline is:

[0058] The working positions of other valves remain unchanged, the second valve is switched to the second working position, and the pressure relief pipeline is connected to the pressure reducing valve to relieve the pressure in the pipeline.

[0059] The reason why the present invention can realize arbitrary switching between four completely different process routes in a short time is that multiple groups of solenoid valves are set up, and the working state of each solenoid valve is controlled by program to realize free switching of different process routes in a short time. The logical control of each solenoid valve and the coordination relationship of the working state are also one of the main inventive points of the present invention.

[0060] Exemplarily, the gas concentration detection method provided by the present invention specifically includes the following steps:

[0061] (1) Laser sensor calibration: The second valve, the third valve, the fifth valve and the sixth valve are switched to the first working position, the first valve and the fourth valve are switched to the second working position, the first standard gas pipeline is connected to the laser sensor inlet through the fourth valve, the first valve and the second valve in sequence, the laser sensor outlet is connected to the exhaust pipeline through the fifth valve, the first standard gas pipeline is passed into the laser sensor, and the laser sensor is calibrated at a single point;

[0062] (2) Water body detection: the first valve and the second valve are switched to the first working state (the working state of the third valve and the fourth valve is irrelevant, because once the first valve is switched to the first working state, the connection between the gas sampling pipeline, the first standard gas pipeline, the second standard gas pipeline and the laser sensor is cut off), the fifth valve and the sixth valve are switched to the second working state, the outlet of the balancing membrane assembly is connected to the inlet of the laser sensor through the first valve and the second valve in turn, and the outlet of the laser sensor is connected to the inlet of the balancing membrane assembly through the fifth valve and the sixth valve in turn, thereby forming a circular connection between the laser sensor and the balancing membrane assembly, and the water body to be tested is sent to the gas concentration detection device through the water sampling pipeline, and the water body to be tested is separated into gas and liquid through the balancing membrane assembly, and the separated gas circulates between the balancing membrane assembly and the laser sensor. When the gas flows through the balancing membrane assembly, the gas on both sides of the balancing membrane assembly and the water body to be tested diffuse under the drive of the concentration difference until the laser sensor detects that the concentration of each gas phase component in the gas tends to be stable and then outputs the detection result. After the detection is completed, the fifth valve and the sixth valve are switched to the first working state, and the outlet of the laser sensor is switched to the exhaust pipeline to exhaust the pipeline;

[0063] (3) Gas detection: The first valve, the third valve and the fourth valve are switched to the second working state, and the second valve, the fifth valve and the sixth valve are switched to the first working state. The gas collection pipeline is connected to the laser sensor inlet through the third valve, the fourth valve, the first valve and the second valve in sequence, and the laser sensor outlet is connected to the exhaust pipeline through the fifth valve. The gas to be tested is sent to the laser sensor through the gas collection pipeline. The laser sensor analyzes each gas phase component in the gas to be tested and outputs the test result.

[0064] (4) Detection result calibration: the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are switched to the first working position, the first valve is switched to the second working position, the second standard gas pipeline is connected to the laser sensor inlet through the fourth valve, the first valve and the second valve in sequence, the laser sensor outlet is connected to the exhaust pipeline through the fifth valve, the second standard gas pipeline introduces the second standard gas (200 ppm standard gas) into the laser sensor, and the detection results obtained during the water body detection process or the gas detection process are calibrated, and the calibrated detection results are transmitted to the data processing unit; the calibration process includes:

[0065] The difference between the actual measurement result of the second standard gas and the standard value is the detection error, which is calculated based on the detection result output during the water body detection process or the gas detection process to obtain the corrected detection result;

[0066] (5) Regular pressure relief: Regularly relieve pressure on the system pipeline, keep the working positions of other valves unchanged, switch the second valve to the second working position, and connect the pressure relief pipeline to the pressure reducing valve through the second valve to relieve pressure on the pipeline.

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] (1) The gas concentration detection device provided by the present invention can automatically complete the continuous measurement of the concentration of each gas component in the gas and water body, and realizes high-precision gas content detection of the gas and water body by setting a laser sensor.

[0069] (2) The present invention is provided with multiple groups of solenoid valves, and the independent operation of different process steps is realized by switching the working positions of the solenoid valves, thereby ensuring that the simultaneous detection and analysis of the gas concentration of water and gas is completed in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 A valve working position diagram of a gas analysis unit for running a laser sensor calibration process provided by a specific embodiment of the present invention;

[0071] Figure 2 A valve working position diagram of a gas analysis unit for running a water body detection process provided by a specific embodiment of the present invention;

[0072] Figure 3 A valve working position diagram of a gas analysis unit for running a gas detection process provided by a specific embodiment of the present invention;

[0073] Figure 4 A valve working position diagram of a gas analysis unit during a test result correction process provided in accordance with a specific embodiment of the present invention.

[0074] Among them, 1-laser sensor; 2-balanced membrane assembly; 3-first valve; 4-second valve; 5-third valve; 6-fourth valve; 7-pressure reducing valve; 8-fifth valve; 9-sixth valve; 10-transportation device; 11-gas collection pipeline; 12-first standard gas pipeline; 13-second standard gas pipeline; 14-pressure relief pipeline; 15-exhaust pipeline. DETAILED DESCRIPTION

[0075] It should be understood that, in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0076] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0077] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0078] In a specific embodiment, the present invention provides a water-gas synchronous gas concentration detection device, the gas concentration detection device is as follows Figure 1-4 As shown, it includes a shell, a balanced membrane assembly 2 is arranged at the water inlet of the shell, a laser sensor 1 is arranged inside the shell, and the balanced membrane assembly 2 and the laser sensor 1 are cyclically connected to separate the gas and liquid of the water body to be tested and detect the concentration of each gas phase component in the gas; the laser sensor 1 is externally connected to the gas collection pipeline 11.

[0079] The water inlet of the shell is connected to the water collection pipeline; the laser sensor 1 is independently connected to the gas collection pipeline 11, the first standard gas pipeline 12 and the second standard gas pipeline 13. The first valve 3, the second valve 4, the third valve 5, the fourth valve 6, the fifth valve 8 and the sixth valve 9 are also arranged inside the shell.

[0080] The inlet of the first valve 3 is independently connected to the balancing membrane assembly 2 and the fourth valve 6, and the outlet of the first valve 3 is connected to the second valve 4. The first valve 3 is a two-position three-way electromagnetic valve, and the first valve 3 includes two working positions. When the first valve 3 is switched to the first working position, the balancing membrane assembly 2 and the second valve 4 are connected, and when the first valve 3 is switched to the second working position, the fourth valve 6 and the second valve 4 are connected.

[0081] The inlet of the second valve 4 is independently connected to the first valve 3 and the pressure relief pipeline 14, and the outlet of the second valve 4 is connected to the laser sensor 1; a pressure reducing valve 7 is arranged on the connecting pipeline between the second valve 4 and the laser sensor 1. The second valve 4 is a two-position three-way solenoid valve, and the second valve 4 includes two working positions. When the second valve 4 is switched to the first working position, the first valve 3 and the laser sensor 1 are connected, and when the second valve 4 is switched to the second working position, the pressure relief pipeline 14 and the laser sensor 1 are connected.

[0082] The inlet of the third valve 5 is independently connected to the gas collection pipeline 11 and the first standard gas pipeline 12, and the outlet of the third valve 5 is connected to the fourth valve 6. The third valve 5 is a two-position three-way solenoid valve, and the third valve 5 includes two working positions. When the third valve 5 is switched to the first working position, the first standard gas pipeline 12 and the fourth valve 6 are connected. When the second valve 4 is switched to the second working position, the gas collection pipeline 11 and the fourth valve 6 are connected.

[0083] The inlet of the fourth valve 6 is independently connected to the third valve 5 and the second standard gas pipeline 13, and the outlet of the fourth valve 6 is connected to the first valve 3. The fourth valve 6 is a two-position three-way electromagnetic valve, and the fourth valve 6 includes two working positions. When the fourth valve 6 is switched to the first working position, the second standard gas pipeline 13 and the first valve 3 are connected, and when the third valve 5 is switched to the second working position, the third valve 5 and the first valve 3 are connected.

[0084] The inlet of the fifth valve 8 is connected to the laser sensor 1, and the outlet of the fifth valve 8 is independently connected to the exhaust pipeline 15 and the sixth valve 9, and a conveying device 10 is arranged on the connecting pipeline between the laser sensor 1 and the fifth valve 8. The fifth valve 8 is a two-position three-way electromagnetic valve, and the fifth valve 8 includes two working positions. When the fifth valve 8 is switched to the first working position, the laser sensor 1 and the exhaust pipeline 15 are connected, and when the third valve 5 is switched to the second working position, the laser sensor 1 and the sixth valve 9 are connected.

[0085] The inlet of the sixth valve 9 is connected to the fifth valve 8, and the outlet of the sixth valve 9 is respectively connected to the exhaust pipeline 15 and the balanced membrane assembly 2. The sixth valve 9 is a two-position three-way solenoid valve, and the sixth valve 9 includes two working positions. When the sixth valve 9 is switched to the first working position, the fifth valve 8 and the exhaust pipeline 15 are connected, and when the sixth valve 9 is switched to the second working position, the fifth valve 8 and the balanced membrane assembly 2 are connected.

[0086] A data processing unit and a power supply unit are also provided inside the housing. The data processing unit is electrically connected to the gas analysis unit and is used to receive and record the detection data transmitted by the gas analysis unit. The power supply unit is electrically connected to the data processing unit and is used to supply power to the data processing unit.

[0087] The working principle of the gas concentration detection device provided by the present invention is:

[0088] (1) Calibration of laser sensor 1 (such as Figure 1 As shown): the second valve 4, the third valve 5, the fifth valve 8 and the sixth valve 9 are switched to the first working position, the first valve 3 and the fourth valve 6 are switched to the second working position, the first standard gas pipeline 12 is connected to the inlet of the laser sensor 1 through the fourth valve 6, the first valve 3 and the second valve 4 in sequence, the outlet of the laser sensor 1 is connected to the exhaust pipeline 15 through the fifth valve 8, the first standard gas pipeline 12 introduces the first standard gas (400ppm standard gas) into the laser sensor 1, and the laser sensor 1 is single-point calibrated;

[0089] (2) Water body testing (such as Figure 2 As shown in the figure): the first valve 3 and the second valve 4 are switched to the first working state (the working state of the third valve 5 and the fourth valve 6 is irrelevant, because once the first valve 3 is switched to the first working state, the connection between the gas production pipeline 11, the first standard gas pipeline 12 and the second standard gas pipeline 13 and the laser sensor 1 is cut off), the fifth valve 8 and the sixth valve 9 are switched to the second working state, the outlet of the balanced membrane assembly 2 is connected to the inlet of the laser sensor 1 through the first valve 3 and the second valve 4 in sequence, and the outlet of the laser sensor 1 is connected to the inlet of the balanced membrane assembly 2 through the fifth valve 8 and the sixth valve 9 in sequence, so that the laser sensor 1 and the balanced membrane assembly 2 form a loop connection, the water body to be tested is sent to the gas concentration detection device through the water sampling pipeline, the water body to be tested is separated into gas and liquid through the balanced membrane assembly 2, and the separated gas circulates between the balanced membrane assembly 2 and the laser sensor 1. When the gas flows through the balanced membrane assembly 2, the gas on both sides of the balanced membrane assembly 2 and the water body to be tested are diffused under the drive of the concentration difference until the laser sensor 1 detects that the concentration of each gas phase component in the gas tends to be stable and then outputs the detection result. After the detection is completed, the fifth valve 8 and the sixth valve 9 are switched to the first working state, and the outlet of the laser sensor 1 is switched to the exhaust pipeline 15 to exhaust the pipeline;

[0090] (3) Gas detection (such as Figure 3 As shown): the first valve 3, the third valve 5 and the fourth valve 6 are switched to the second working state, the second valve 4, the fifth valve 8 and the sixth valve 9 are switched to the first working state, the gas sampling pipeline 11 is connected to the inlet of the laser sensor 1 through the third valve 5, the fourth valve 6, the first valve 3 and the second valve 4 in sequence, the outlet of the laser sensor 1 is connected to the exhaust pipeline 15 through the fifth valve 8, the gas to be measured is sent to the laser sensor 1 through the gas sampling pipeline 11, and the laser sensor 1 analyzes each gas phase component in the gas to be measured to obtain the detection result;

[0091] (4) Test result correction (such as Figure 4 As shown in the figure): the second valve 4, the third valve 5, the fourth valve 6, the fifth valve 8 and the sixth valve 9 are switched to the first working state, the first valve 3 is switched to the second working state, the second standard gas pipeline 13 is connected to the inlet of the laser sensor 1 through the fourth valve 6, the first valve 3 and the second valve 4 in sequence, the outlet of the laser sensor 1 is connected to the exhaust pipeline 15 through the fifth valve 8, the second standard gas pipeline 13 passes the second standard gas (200ppm standard gas) to the laser sensor 1, and the detection results obtained in the water body detection process or the gas detection process are corrected, and the corrected detection results are transmitted to the data processing unit; the correction process includes:

[0092] The difference between the actual measurement result of the second standard gas and the standard value is the detection error, which is calculated based on the detection result output during the water body detection process or the gas detection process to obtain the corrected detection result;

[0093] (5) Regular pressure relief: Regularly relieve pressure on the system pipeline, keep the working positions of other valves unchanged, switch the second valve 4 to the second working position, and connect the pressure relief pipeline 14 to the pressure reducing valve 7 through the second valve 4 to relieve pressure on the pipeline.

[0094] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for detecting gas concentration synchronously with water and gas, characterized in that: A gas concentration detection device synchronized with water and gas is used to synchronously analyze and detect the concentration of each gas phase component in the gas and water. The gas concentration detection device includes a shell, a balanced membrane assembly is arranged at the water inlet of the shell, and a laser sensor is arranged inside the shell. The balanced membrane assembly and the laser sensor are cyclically connected to separate gas and liquid from the water to be tested and detect the concentration of each gas phase component in the gas; the laser sensor is externally connected to a gas collection pipeline; The water inlet of the shell is connected to the water collection pipeline; The laser sensor is independently connected to the gas collection pipeline, the first standard gas pipeline and the second standard gas pipeline; The housing is further provided with a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a sixth valve; The inlet of the first valve is independently connected to the balancing membrane assembly and the fourth valve, and the outlet of the first valve is connected to the second valve; The inlet of the second valve is independently connected to the first valve and the pressure relief pipeline, and the outlet of the second valve is connected to the laser sensor; a pressure reducing valve is arranged on the connecting pipeline between the second valve and the laser sensor; The inlet of the third valve is independently connected to the gas collection pipeline and the first standard gas pipeline, and the outlet of the third valve is connected to the fourth valve; The inlet of the fourth valve is independently connected to the third valve and the second standard gas pipeline, and the outlet of the fourth valve is connected to the first valve; The inlet of the fifth valve is connected to the laser sensor, and the outlet of the fifth valve is independently connected to the exhaust pipeline and the sixth valve respectively; A conveying device is provided on the connecting pipeline between the laser sensor and the fifth valve; The sixth valve inlet is connected to the fifth valve, and the sixth valve outlet is respectively connected to the exhaust pipeline and the balancing membrane assembly; The gas concentration detection method comprises: The water body to be tested is passed into the gas concentration detection device, and the balanced membrane assembly separates the gas and liquid in the water body to be tested. The separated gas circulates between the balanced membrane assembly and the laser sensor. When the gas flows through the balanced membrane assembly, it undergoes equilibrium diffusion with the gas in the water body to be tested until the gas concentration tends to be stable, and then the laser sensor analyzes and detects the gas phase components in the gas; the gas to be tested is passed into the laser sensor through the gas sampling pipeline, and the gas phase components in the gas to be tested are analyzed and detected.

2. The gas concentration detection method according to claim 1, characterized in that: The first valve is a two-position three-way electromagnetic valve, and the first valve includes two working positions. When the first valve is switched to the first working position, the balancing membrane assembly and the second valve are connected. When the first valve is switched to the second working position, the fourth valve and the second valve are connected.

3. The gas concentration detection method according to claim 1, characterized in that: The second valve is a two-position three-way solenoid valve, and the second valve includes two working positions. When the second valve is switched to the first working position, the first valve and the laser sensor are connected; when the second valve is switched to the second working position, the pressure relief pipeline and the laser sensor are connected.

4. The gas concentration detection method according to claim 1, characterized in that: The third valve is a two-position three-way solenoid valve, and the third valve includes two working positions. When the third valve is switched to the first working position, the first standard gas pipeline and the fourth valve are connected. When the second valve is switched to the second working position, the gas collection pipeline and the fourth valve are connected.

5. The gas concentration detection method according to claim 1, characterized in that: The fourth valve is a two-position three-way electromagnetic valve, and the fourth valve includes two working positions. When the fourth valve is switched to the first working position, the second standard gas pipeline and the first valve are connected. When the third valve is switched to the second working position, the third valve and the first valve are connected.

6. The gas concentration detection method according to claim 1, characterized in that: The fifth valve is a two-position three-way electromagnetic valve, and the fifth valve includes two working positions. When the fifth valve is switched to the first working position, the laser sensor and the exhaust pipe are connected. When the third valve is switched to the second working position, the laser sensor and the sixth valve are connected.

7. The gas concentration detection method according to claim 1, characterized in that: The sixth valve is a two-position three-way solenoid valve, and the sixth valve includes two working positions. When the sixth valve is switched to the first working position, the fifth valve and the exhaust pipeline are connected. When the sixth valve is switched to the second working position, the fifth valve and the balancing membrane assembly are connected.

8. The gas concentration detection method according to claim 1, characterized in that: The laser sensor, the balancing membrane assembly, the first to sixth valves, the pressure reducing valve, the conveying device, the gas collection pipeline, the first standard gas pipeline, the second standard gas pipeline, the pressure relief pipeline and the exhaust pipeline constitute a gas analysis unit.

9. The gas concentration detection method according to claim 8, characterized in that: A data processing unit and a power supply unit are also provided inside the shell. The data processing unit is electrically connected to the gas analysis unit and is used to receive and record the detection data transmitted by the gas analysis unit. The power supply unit is electrically connected to the data processing unit and is used to supply power to the data processing unit.

10. The gas concentration detection method according to claim 1, characterized in that: The gas concentration detection method includes the following four independently running process: laser sensor calibration, water body detection, gas detection and detection result correction.

11. The gas concentration detection method according to claim 10, characterized in that: The laser sensor calibration process specifically includes: The first standard gas pipeline introduces the first standard gas into the laser sensor to calibrate the laser sensor.

12. The gas concentration detection method according to claim 10, characterized in that: The water body detection process specifically includes: The water to be tested is sent into the gas concentration detection device through the water sampling pipeline. The water to be tested is separated into gas and liquid through the balanced membrane assembly. The separated gas circulates between the balanced membrane assembly and the laser sensor. When the gas flows through the balanced membrane assembly, the gas on both sides of the balanced membrane assembly and the water to be tested are balanced and diffused until the laser sensor detects that the concentration of each gas phase component in the gas tends to be stable and then outputs the detection result. The gas is exhausted after the detection is completed.

13. The gas concentration detection method according to claim 10, characterized in that: The gas detection process specifically includes: The gas to be tested is introduced into the laser sensor through the gas sampling pipeline, and the laser sensor analyzes each gas phase component in the gas to be tested and outputs the test results.

14. The gas concentration detection method according to claim 10, characterized in that: The detection result correction process specifically includes: The second standard gas is passed into the laser sensor through the second standard gas pipeline. The difference between the actual measured result of the second standard gas and the standard value is the detection error. The detection error is calculated based on the detection result output during the water body detection process or the gas detection process to obtain the corrected detection result, and the corrected detection result is transmitted to the data processing unit.

15. The gas concentration detection method according to claim 10, characterized in that: The independent operation of different process steps can be realized by switching the working position of the valve in the gas concentration detection device; The following methods are used to achieve independent operation of different process steps: (I) The second valve, the third valve, the fifth valve and the sixth valve are switched to the first working position, the first valve and the fourth valve are switched to the second working position, the first standard gas pipeline is connected to the laser sensor inlet, and the laser sensor outlet is connected to the exhaust pipeline, and the laser sensor is calibrated; (II) The first valve and the second valve are switched to the first working position, the fifth valve and the sixth valve are switched to the second working position, the balance membrane assembly and the laser sensor are circulated and connected to perform water body detection, after the detection, the fifth valve and the sixth valve are switched to the first working position, the outlet of the laser sensor is switched and connected to the exhaust pipeline, and the pipeline is exhausted; (III) The first valve, the third valve and the fourth valve are switched to the second working state, the second valve, the fifth valve and the sixth valve are switched to the first working state, the gas collection pipeline is connected to the laser sensor inlet, and the laser sensor outlet is connected to the exhaust pipeline for gas detection; (IV) The second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are switched to the first working position, the first valve is switched to the second working position, the second standard gas pipeline is connected to the inlet of the laser sensor, and the outlet of the laser sensor is connected to the exhaust pipeline to calibrate the detection results.

16. The gas concentration detection method according to claim 1, characterized in that: The gas concentration detection method also includes periodic pipeline pressure relief.

17. The gas concentration detection method according to claim 16, characterized in that: The switching mode of the valve working position during the periodic pressure relief process of the pipeline is: The working positions of other valves remain unchanged, the second valve is switched to the second working position, and the pressure relief pipeline is connected to the pressure reducing valve to relieve the pressure in the pipeline.

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