Electronic nose gas detection system and detection method

Abstract

The invention relates to the technical field of gas detection equipment, and discloses an electronic nose gas detection system and detection method.The electronic nose gas detection system comprises a gas collection module, a gas conveying module, a gas reaction module, a control module, a data processing module and a gas recovery module; the gas collection module is used for absorbing a gas sample and a target gas from the outside, the gas transmission module is used for guiding the gas to flow from the gas collection module to the gas reaction module, and the gas reaction module is used for enabling the target gas and a specific reaction reagent to be mutually contacted and react; the control module is used for controlling on / off of an electromagnetic valve and a vacuum pump in the gas conveying module; the gas recovery module is used for separating valuable gas from waste gas or other gas mixtures and recovering the valuable gas; the device is simple in structure, convenient to use and high in detection precision, and cyclic utilization of resources is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection equipment, and in particular to an electronic nose gas detection system and a detection method. Background Art

[0002] An electronic nose is an electronic system that uses the response pattern of a gas sensor array to identify odors. It consists of a sensor array and an appropriate pattern recognition system and can identify simple or complex gases. At present, most electronic nose products on the market are produced abroad. These instruments are generally large in size and expensive, and it is difficult to meet the current domestic market demand for portable devices. Based on this, the electronic nose system is developing in the direction of portability and networking. With the continuous development of computer network technology, the Internet can already realize remote data transmission. The remote transmission, storage and calculation of electronic nose detection data based on the network have huge advantages in flexibility and practicality. The present invention combines a server to develop a network communication electronic nose detection platform, and stores and calculates electronic nose data on the server side. The entire system is flexible and lightweight, easy to use, and not restricted by location.

[0003] With the advancement of science and technology, people have discovered that smell can also be used as a criterion for measuring product quality. For example, if food or grain deteriorates or becomes moldy, it will emit corresponding gases, which can sometimes be smelled by people and sometimes difficult to detect. Therefore, electronic noses that simulate olfactory detection have emerged. Electronic nose technology has the advantages of real-time, rapid, and non-destructive testing. However, there is currently a lack of universal electronic nose detection equipment, and the existing detection system is not fully functional, has low detection accuracy, and cannot recover gas.

[0004] Therefore, there is an urgent need for a technology to replace the existing detection system to solve the problems of incomplete detection system functions, low detection accuracy and inability to recover gas. Summary of the invention

[0005] The embodiment of the present application provides an electronic nose gas detection system and detection method, which are used to solve the problems existing in the related art, such as incomplete detection system functions and low detection accuracy.

[0006] According to one aspect of an embodiment of the present application, an electronic nose gas detection system is provided, comprising:

[0007] Gas collection module, gas delivery module, gas reaction module, control module, data processing module and gas recovery module;

[0008] The gas collection module is used to absorb the target gas from the outside;

[0009] The gas delivery module is used to guide gas from the gas collection module to the gas reaction module. The gas delivery module includes a solenoid valve group, a vacuum pump group, and a flowmeter group;

[0010] The gas reaction module is used to bring the target gas and specific reaction reagents into contact with each other and carry out reactions. The gas reaction module establishes multiple reaction zones, each zone targeting a specific gas component, and each zone uses different reaction reagents and a sensor array to simultaneously react various components in the collected mixed gas in different zones;

[0011] The control module accurately regulates the opening and closing of the solenoid valves, the power of the vacuum pumps, and the measurement range of the flowmeters according to the set program and measurement requirements;

[0012] The data processing module is used to amplify, filter, denoise, and normalize the weak electrical signals output by the sensor array, perform digital conversion on the preprocessed signals, and analyze and process the data using built-in algorithms;

[0013] The data processing module is equipped with an alarm device. Set the safety gas concentration threshold as X, and the detected target gas concentration value as ΔX, where X > 0;

[0014] When ΔX < X, the target gas concentration is the normal gas concentration;

[0015] When ΔX ≥ X, the target gas concentration is the dangerous gas concentration, and the alarm device is triggered;

[0016] The gas recovery module is used to separate valuable gases from other gas mixtures and recover them.

[0017] Furthermore, the acquisition module includes a baseline adjustment channel, a sampling channel, and an enrichment channel; the baseline adjustment channel is used to calibrate the baseline signal of the sensor, the sampling channel is used to absorb the target gas to be detected in the outside world, and the enrichment channel is used to aggregate and concentrate the target gas molecules, adsorb the target gas using an adsorbent. After a certain amount of gas is adsorbed on the surface of the adsorption material in the channel, it is quickly released near the sensor array through the desorption process.

[0018] Furthermore, before detecting the target gas, the gas reaction module first adjusts the electronic flowmeter to the initial value, then connects the standard gas for adjusting the baseline, and then the control module controls the second solenoid valve to be energized, the normally closed channel to be turned on, the third solenoid valve to be energized, the normally closed channel to be turned on, and the fifth solenoid valve to be energized, changing the normally closed channel to a passage; the control module controls the first vacuum pump to be energized and start working, and draws the standard gas through the electronic flowmeter and the fifth solenoid valve, and enters different reaction zones through the gas path; at the same time, the control module controls the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve to be energized and the electrical path to be turned on, and the second vacuum pump starts to be energized to slowly discharge the gas in the reaction zone through the manual regulating valve at a speed first fast and then slow, and in this process, the value changes of the sensor in the reaction zone are observed, and when the baseline adjustment is stable, the sensor baseline can be calibrated at this time.

[0019] Further, after calibrating the sensor baseline, the control module controls the first solenoid valve, the second solenoid valve, the third solenoid valve and the fifth solenoid valve to be powered off, the first vacuum pump is powered off, and the baseline adjustment channel stops supplying gas; the flow control of the manual flowmeter is adjusted, and the second vacuum pump continues to work to slowly extract the standard gas in the reaction zone, reduce the concentration of the standard gas in the reaction chamber, and reduce the air pressure for the target gas to enter the reaction zone; after the concentration in the reaction zone is reduced, the sampling channel starts to take in air, the control module controls the first solenoid valve, the second solenoid valve, and the third solenoid valve to be powered on respectively, the fifth solenoid valve is turned on, and the first vacuum pump is started. Due to the pressure difference, the sampling gas quickly enters the reaction zone and diffuses. When the sampling gas basically fills the reaction zone, the control module controls the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve to be turned on respectively, the second vacuum pump is powered on, and the manual flowmeter is adjusted to overflow part of the target gas and the original standard gas in the reaction zone. At this time, the fourth solenoid valve is turned on to discharge the gas. After the target gas fills the reaction zone, all solenoid valves and pumps are powered off, and the sensor analyzes and reads stable gas readings.

[0020] Furthermore, the gas recovery module includes a pressure sensor for real-time monitoring of the pressure of the gas inside the recovery module. The pressure sensor is electrically connected to the alarm device, and the monitored gas pressure inside the recovery module is set to ΔP;

[0021] When 1<ΔP<5 standard atmospheric pressure, the gas pressure inside the recovery module is within the normal range;

[0022] When 1 ≥ ΔP or 5 ≤ ΔP standard atmospheric pressure, the gas pressure inside the recovery module is outside the normal range and the alarm device is triggered.

[0023] Furthermore, the recovery methods of the gas recovery module include compression storage, adsorption storage, chemical reaction recovery and catalytic reaction recovery.

[0024] Furthermore, the gas recovery module includes a condensation component and a membrane separation component; the condensation component is used to reduce the gas temperature to below the boiling point of the target gas, converting the gas from gas to liquid, and the membrane separation component is used for gas separation based on the selective permeation of gas molecules on both sides of the membrane.

[0025] Furthermore, the electronic nose gas detection system also includes a remote monitoring module for transmitting the system's detection data, the working status of each module, and alarm information to a mobile terminal device in real time.

[0026] Furthermore, the remote monitoring module stores the data received by the detection system on a local device first, and then regularly uploads the data to a cloud server for backup and sharing.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The gas reaction module establishes multiple reaction zones, and each zone uses different reaction reagents and sensor arrays for specific gas components, so that the reaction detection of various components in the collected mixed gas can be performed at the same time. This partitioned and targeted design greatly improves the efficiency and accuracy of the detection, and can analyze the composition of the mixed gas more comprehensively and carefully, and can also cope well with complex gas environments;

[0029] 2. The gas recovery module can separate valuable gases from other gas mixtures and recycle them, realizing the effective utilization of resources and avoiding the waste of valuable gases. It has positive significance from the perspective of environmental protection and resource utilization, and also expands the functional practicality of the entire system;

[0030] 3. The various modules of the electronic nose gas detection system work together to form a relatively complete, efficient, accurate, safe and practical gas detection and related processing process from gas collection, transportation, reaction, data processing to gas recovery. It has many beneficial effects and can play an important role in many scenarios that require gas detection and resource utilization.

[0031] According to another aspect of the embodiment of the present application, a method for electronic nose gas detection is provided, comprising the following steps:

[0032] S100: Absorb the target gas from the outside. Before detecting the target gas, first adjust the electronic flow meter to the initial value, then connect the standard gas for adjusting the baseline, then the second solenoid valve is energized, the normally closed channel is turned on; the third solenoid valve is energized, the normally closed channel is turned on; the fifth solenoid valve is energized, and the normally closed channel becomes a passage;

[0033] S200: The first vacuum pump is powered on and starts working, extracting the standard gas through the electronic flow meter and the fifth solenoid valve, and entering different reaction zones through the gas path;

[0034] S300: The sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are electrically connected, and the second vacuum pump starts to be powered on to slowly discharge the gas in the reaction zone through the manual regulating valve at a speed first fast and then slow. During this process, the value change of the sensor in the reaction zone is observed. When the baseline adjustment is stable, the sensor baseline can be calibrated at this time;

[0035] S400: After the sensor baseline is calibrated, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fifth solenoid valve are powered off, the first vacuum pump is powered off, and the baseline adjustment channel stops supplying gas;

[0036] S500: adjusting the flow control of the manual flow meter, the second vacuum pump continues to work to slowly extract the standard gas in the reaction zone, reduce the concentration of the standard gas in the reaction chamber, and reduce the gas pressure for the target gas to enter the reaction zone;

[0037] S600: After the concentration in the reaction zone decreases, the sampling channel starts to take in air, the first solenoid valve, the second solenoid valve, and the third solenoid valve are energized respectively, the fifth solenoid valve is turned on, and the first vacuum pump is started. Due to the pressure difference, the sampling gas quickly enters the reaction zone and diffuses;

[0038] S700: When the sampled gas basically fills the reaction zone, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are turned on respectively, the second vacuum pump is powered on, and the manual flow meter is adjusted to overflow part of the target gas and the original standard gas in the reaction zone. At this time, the fourth solenoid valve is turned on to discharge the gas;

[0039] S800: After the target gas fills the reaction zone, all solenoid valves and pumps are powered off, and the sensor analyzes and reads the gas stable readings;

[0040] S900: Separate and recycle the exhausted mixed gas.

[0041] It is understandable that the above-mentioned electronic nose gas detection system and detection method have the same beneficial effects, which will not be described in detail here.

[0042] The technical solution of the present application is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0044] The present application can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0045] Figure 1The structure block diagram of the electronic nose gas detection system provided by an embodiment of the present application is shown;

[0046] Figure 2 A circuit diagram of an electronic nose gas detection system provided by an embodiment of the present application is shown;

[0047] Figure 3 A flow chart showing the steps of an electronic nose gas detection method provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0049] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is not intended to limit the present application, its application, or uses.

[0051] Technologies, systems, and devices known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, such technologies, systems, and devices should be considered part of the specification.

[0052] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0053] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0054] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] Combine the following Figure 1-Figure 2To describe the electronic nose gas detection system and detection method according to the exemplary embodiment of the present application. It should be noted that the following application scenarios are only shown to facilitate understanding of the spirit and principle of the present application, and the embodiments of the present application are not limited in this regard. On the contrary, the embodiments of the present application can be applied to any applicable scenario.

[0056] Furthermore, the present application proposes an electronic nose gas detection system, comprising:

[0057] Gas collection module, gas delivery module, gas reaction module, control module, data processing module and gas recovery module;

[0058] The gas collection module is used to absorb the target gas from the outside;

[0059] The gas delivery module is used to guide the gas from the gas collection module to the gas reaction module, and the gas delivery module includes a magnetic valve group, a vacuum pump group and a flow meter group;

[0060] The gas reaction module is used to contact and react the target gas and specific reaction reagents. The gas reaction module establishes multiple reaction zones, each zone is for a specific gas component, and each zone uses different reaction reagents and sensor arrays to react various components in the collected mixed gas in different zones at the same time;

[0061] Specifically, the composition of the sensor array and its classification in the reaction zone are:

[0062] (1) First reaction zone: carbon dioxide and oxygen detection array

[0063] Target gas: Carbon dioxide (CO 2 ) and oxygen (O 2 )

[0064] Sensor used: ①Sensor 1 (oxygen sensor, specifically used for oxygen detection)

[0065] ②Sensor 2 (carbon dioxide sensor, suitable for carbon dioxide concentration detection)

[0066] Since oxygen sensors need to be protected from oxidation, infrared sensors for detecting carbon dioxide are specially designed to be placed in an air chamber to avoid cross-influence.

[0067] (2) Second reaction zone: Alkane and reducing gas detection array

[0068] Target gas: Alkane gases such as methane, propane, butane, and reducing gases such as hydrogen and carbon monoxide

[0069] Use sensors:

[0070] ①Sensor 1 is used to detect propane, butane and liquefied gas.

[0071] ②Sensor 2 specifically detects methane (CH 4 ).

[0072] ③Sensor 3 detects various alkane gases such as methane, propane, isobutane, etc.

[0073] ④Sensor 4 is used to detect alkane gases such as methane and butane

[0074] ⑤Sensor 5 can detect liquefied gas and methane

[0075] ⑥ Sensor 6 is used as a supplementary sensor for alkanes and reducing gases to detect hydrogen, carbon monoxide and combustible gases.

[0076] (3) Third reaction zone: Volatile organic compounds (VOC) and other gas detection array Target gases: ethanol, amines, hydrogen sulfide, aldehydes, lipids, ketones and other volatile organic compounds (VOC)

[0077] Use sensors:

[0078] ①Sensor 1 is used to detect organic volatile gases such as ethanol, lipids, alcohols, etc.

[0079] ②Sensor 2 detects hydrogen sulfide (H 2 S), amine compounds, volatile organic compounds.

[0080] ③ Sensor 3 is used to detect amines and sulfides (such as gases from food corruption).

[0081] ④Sensor 4 is used to detect hydrogen sulfide (H 2 S). (MQ136)

[0082] ⑤Sensor 5 supplements the detection of ethanol.

[0083] ⑥ Sensor 6 additionally detects ammonia, hydrogen sulfide and other volatile organic compounds in the air.

[0084] ⑦Sensor 7 is used to detect organic solvent gases such as aldehydes and ketones;

[0085] ⑧Sensor 8 is mainly used to detect formaldehyde, and can also detect benzene, acetic acid, acetone, etc.

[0086] The control module accurately regulates the opening and closing of the solenoid valve, the power of the vacuum pump, and the measuring range of the flow meter according to the set program and measurement requirements;

[0087] The data processing module is used to amplify, filter, denoise, and normalize the weak electrical signals output by the sensor array, perform digital conversion on the preprocessed signals, and analyze and process the data using built-in algorithms;

[0088] The data processing module is equipped with an alarm device. The safety gas concentration threshold is set as X, and the detected target gas concentration value is ΔX, where X > 0;

[0089] When ΔX < X, the target gas concentration is the normal gas concentration;

[0090] When ΔX ≥ X, the target gas concentration is the dangerous gas concentration, and the alarm device is triggered;

[0091] The gas recovery module is used to separate and recover valuable gases from other gas mixtures.

[0092] Specifically, the gas reaction module is provided with three different reaction zones, which are respectively used to detect different types of target gases such as carbon dioxide and oxygen, alkanes and reducing gases, volatile organic compounds (VOCs) and other gases. This zoning design enables the system to accurately analyze multiple gas components simultaneously. Whether it is carbon dioxide and oxygen commonly found in environmental monitoring, or alkanes, reducing gases, and various volatile organic compounds that may be involved in industrial production and living scenarios, it can effectively cover them, greatly improving the comprehensiveness of detection.

[0093] It can be understood that the gas recovery module can separate and recover valuable gases from other gas mixtures, realizing the reuse of resources and avoiding the waste of valuable gases. If some gases are directly discharged, it will not only waste resources but also may have an impact on the environment. Through the recycling and utilization of this module, it has positive significance from both environmental protection and economic perspectives, enhancing the comprehensive value of the entire system.

[0094] Specifically, the acquisition module includes a baseline adjustment channel, a sampling channel, and an enrichment channel; the baseline adjustment channel is used to calibrate the baseline signal of the sensor, the sampling channel is used to absorb the target gas to be detected in the external environment, and the enrichment channel is used to aggregate and concentrate the target gas molecules, adsorb the target gas using an adsorbent. After a certain amount of gas is adsorbed on the surface of the adsorption material in the channel, it is quickly released near the sensor array through the desorption process.

[0095] Specifically, the baseline adjustment channel can effectively eliminate the initial deviation of the sensor caused by its own characteristics and environmental factors (such as temperature and humidity changes) by calibrating the baseline signal of the sensor; the sampling channel is responsible for absorbing the target gas to be detected from the outside world, which is the basic link of the entire detection process; the enrichment channel uses adsorbents to adsorb the target gas to achieve the function of aggregating and concentrating the target gas molecules.

[0096] It is understandable that through the concentration effect of the enrichment channel, the originally trace target gas can reach a concentration level that can be more accurately detected by the sensor, effectively improving the detection sensitivity of the detection system for low-concentration target gas, so that those trace but potentially important gases can also be accurately detected.

[0097] Specifically, before detecting the target gas, the gas reaction module first adjusts the electronic flowmeter to the initial value, then connects the standard gas for adjusting the baseline, and then powers on the second solenoid valve to connect the normally closed channel; the third solenoid valve powers on to connect the normally closed channel; the fifth solenoid valve powers on to change from normally closed to open; the first vacuum pump powers on and starts working to draw the standard gas through the electronic flowmeter and the fifth solenoid valve, and into different reaction zones through the gas path; at the same time, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are respectively powered on to connect the electrical paths, and the second vacuum pump starts to power on to slowly discharge the gas in the reaction zone through the manual regulating valve at a speed first fast and then slow. In this process, the numerical changes of the sensor in the reaction zone are observed. When the baseline adjustment is stable, the sensor baseline can be calibrated at this time.

[0098] Specifically, after calibrating the sensor baseline, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fifth solenoid valve are powered off, the first vacuum pump is powered off, and the baseline adjustment channel stops supplying gas; the flow control of the manual flowmeter is adjusted, and the second vacuum pump continues to work to slowly extract the standard gas in the reaction area, reduce the concentration of the standard gas in the reaction chamber, and reduce the air pressure for the target gas to enter the reaction area; after the concentration in the reaction area is reduced, the sampling channel begins to take in air, the first solenoid valve, the second solenoid valve, and the third solenoid valve are powered on respectively, the fifth solenoid valve is turned on, and the first vacuum pump is started. Due to the pressure difference, the sampling gas quickly enters the reaction area and diffuses. When the sampling gas basically fills the reaction area, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are turned on respectively, the second vacuum pump is powered on, and the manual flowmeter is adjusted to overflow part of the target gas and the original standard gas in the reaction area. At this time, the fourth solenoid valve is turned on to discharge the gas. After the target gas fills the reaction area, all solenoid valves and pumps are powered off, and the sensor analyzes and reads stable readings of the gas.

[0099] It is understandable that after completing the baseline calibration of the sensor, through the orderly control of each solenoid valve, vacuum pump and manual flow meter, the concentration of the standard gas in the reaction chamber is first reduced to reduce the air pressure, and the pressure difference is used to allow the sampled gas to quickly enter the reaction area and diffuse. This intake method based on the principle of air pressure difference ensures that the target gas can enter the reaction area efficiently and smoothly, avoiding insufficient or uneven gas entry due to air pressure problems, making the gas distribution in the reaction area more in line with the detection requirements, laying the foundation for the subsequent accurate analysis of the target gas composition and concentration, and ensuring the smooth implementation of the detection work.

[0100] Specifically, when the sampled gas basically fills the reaction zone, part of the target gas and the original standard gas in the reaction zone are overflowed by controlling the relevant solenoid valves, vacuum pumps and manual flow meters, and then the excess gas is discharged until the target gas fills the reaction zone and the operation is stopped. This method of carefully adjusting the gas environment in the reaction zone can eliminate excess gas that may interfere with the detection of the target gas, make the gas composition in the reaction zone as pure as possible and meet the detection requirements, and allow the sensor to analyze and read stable readings in an ideal gas environment, thereby improving the accuracy of the detection, reflecting the actual characteristics and parameters of the target gas more truly and accurately, and helping to obtain high-quality detection results.

[0101] Specifically, the gas recovery module includes a pressure sensor for real-time monitoring of the pressure of the gas inside the recovery module. The pressure sensor is electrically connected to the alarm device. The monitored gas pressure inside the recovery module is set to ΔP;

[0102] When 1<ΔP<5 standard atmospheric pressure, the gas pressure inside the recovery module is within the normal range;

[0103] When 1 ≥ ΔP or 5 ≤ ΔP standard atmospheric pressure, the gas pressure inside the recovery module is outside the normal range and the alarm device is triggered.

[0104] It is understandable that during the gas recovery process, if the internal gas pressure exceeds the normal range, it may cause a series of safety hazards, such as container rupture, gas leakage, and even explosion. The pressure sensor monitors the pressure of the gas inside the recovery module in real time, and sets a reasonable pressure threshold. When the pressure is in an abnormal range, the alarm device can be triggered in time. Relevant staff can quickly know and take corresponding measures, such as adjusting the recovery process, checking whether the equipment is faulty, etc., effectively preventing safety accidents caused by abnormal pressure and ensuring the safety of the entire gas recovery work and the surrounding environment.

[0105] Specifically, the recovery methods of the gas recovery module include compression storage, adsorption storage, chemical reaction recovery and catalytic reaction recovery.

[0106] Specifically, the gas recovery module includes a condensation component and a membrane separation component; the condensation component is used to reduce the gas temperature to below the boiling point of the target gas and convert the gas from gas to liquid; the membrane separation component is used for gas separation based on the selective permeation of gas molecules on both sides of the membrane.

[0107] It is understandable that the condensation component lowers the gas temperature to below the boiling point of the target gas, thereby causing the gas to transform from a gaseous state to a liquid state. Liquid target gas is easier to collect and store than gaseous gas, which facilitates further processing or reuse. For example, in some industrial production, valuable organic solvent gas can be collected in conventional containers after being condensed into a liquid state, reducing the loss caused by gas volatilization and improving the efficiency and convenience of resource recovery;

[0108] In many mixed gas environments, different gases have different boiling points. By using the condensation component to lower the temperature, preliminary separation can be achieved based on the difference in boiling points of each gas, so that the target gas is liquefied and precipitated first, while other impurity gases with higher or lower boiling points remain in gaseous form, thereby achieving a certain degree of separation effect, improving the purity of the target gas recovery, and helping to obtain purer and higher quality recyclable gas resources in the future, meeting the requirements for the purity of the recovered gas in different application scenarios.

[0109] Specifically, the electronic nose gas detection system also includes a remote monitoring module for transmitting the system's detection data, the working status of each module, and alarm information to a mobile terminal device in real time.

[0110] It is understandable that professionals can directly conduct simple analysis of the received data on the mobile terminal device, and even use some data analysis software to conduct deeper mining, and timely adjust the relevant parameters and working mode of the detection system according to the analysis results. According to the trend of air quality detection data changes over a period of time, it is remotely determined whether the sampling frequency and detection range of the electronic nose gas detection system need to be optimized, making decision-making more timely and scientific, and further improving the overall performance and detection effect of the gas detection system.

[0111] Specifically, the remote monitoring module stores the data received by the detection system on the local device first, and then regularly uploads the data to the cloud server for backup and sharing.

[0112] It is understandable that the remote monitoring module's data processing method of first storing data locally and then regularly uploading it to the cloud server for backup and sharing has significant beneficial effects in ensuring data security, promoting shared collaboration, controlling costs, and standardizing data management.

[0113] See also Figure 3As shown, according to another aspect of the embodiment of the present application, a method for detecting gas by an electronic nose is provided, comprising the following steps:

[0114] Step 1: Absorb the target gas from the outside. Before detecting the target gas, first adjust the electronic flow meter to the initial value, then connect the standard gas for adjusting the baseline, then the second solenoid valve is energized, the normally closed channel is turned on; the third solenoid valve is energized, the normally closed channel is turned on; the fifth solenoid valve is energized, and the normally closed channel becomes a passage;

[0115] Step 2: The first vacuum pump is powered on and starts working, and the standard gas is drawn through the electronic flow meter and the fifth solenoid valve, and enters different reaction zones through the gas path;

[0116] Step 3: The sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are electrically connected, and the second vacuum pump starts to work to slowly discharge the gas in the reaction zone through the manual regulating valve at a speed first fast and then slow. During this process, the value change of the sensor in the reaction zone is observed. When the baseline adjustment is stable, the sensor baseline can be calibrated at this time;

[0117] Step 4: After the sensor baseline is calibrated, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fifth solenoid valve are powered off, the first vacuum pump is powered off, and the baseline adjustment channel stops supplying gas;

[0118] Step 5: Adjust the flow control of the manual flow meter, and the second vacuum pump continues to work to slowly extract the standard gas in the reaction zone, reduce the concentration of the standard gas in the reaction chamber, and reduce the gas pressure for the target gas to enter the reaction zone;

[0119] Step 6: After the concentration in the reaction zone decreases, the sampling channel starts to take in air, the first solenoid valve, the second solenoid valve, and the third solenoid valve are energized respectively, the fifth solenoid valve is turned on, and the first vacuum pump is started. Due to the pressure difference, the sampling gas quickly enters the reaction zone and diffuses;

[0120] Step 7: When the sampled gas basically fills the reaction zone, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are turned on respectively, the second vacuum pump is powered on, and the manual flow meter is adjusted to overflow part of the target gas and the original standard gas in the reaction zone. At this time, the fourth solenoid valve is turned on to discharge the gas;

[0121] Step 8: After the target gas fills the reaction area, all solenoid valves and pumps are powered off, and the sensor analyzes and reads the stable reading of the gas;

[0122] Step nine: Separate and recycle the exhausted mixed gas.

[0123] It can be understood that after the sampled gas basically fills the reaction zone, a series of solenoid valves are turned on, the second vacuum pump is powered on, and the manual flow meter is adjusted to allow part of the target gas and the original standard gas in the reaction zone to overflow, and the gas is discharged at the same time, so that the reaction zone can finally be filled with a suitable amount of target gas and be in a relatively stable state, which is convenient for the sensor to accurately analyze and read stable readings, thereby improving the accuracy and reliability of the test results;

[0124] The move of separating and recycling the discharged mixed gas reflects the advantages of environmental protection and resource utilization. It not only avoids the environmental pollution problems that may be caused by the random discharge of mixed gases, but also can recycle and reuse the valuable components in them, which is in line with the concept of sustainable development and efficient utilization of resources.

[0125] It should be noted that:

[0126] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known structures and technologies are not shown in detail so as not to obscure the understanding of this description.

[0127] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the disclosed system should not be interpreted as reflecting the following schematic diagram: the claimed application requires more features than those explicitly recited in each claim.

[0128] Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment.The claims following the Detailed Description are thus hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this application.

[0129] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present application and to form different embodiments.

[0130] For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0131] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An electronic nose gas detection system, characterized in that: Including: A gas collection module, a gas delivery module, a gas reaction module, a control module, a data processing module, and a gas recovery module; The gas collection module is used to absorb the target gas from the outside world; The gas delivery module is used to guide the gas to flow from the gas collection module to the gas reaction module. The gas delivery module includes a magnetic valve group, a vacuum pump group, and a flowmeter group; The gas reaction module is used to bring the target gas and specific reaction reagents into contact with each other and react. The gas reaction module establishes multiple reaction zones, each zone targeting a specific gas component, and each zone uses different reaction reagents and a sensor array to react various components in the collected mixed gas simultaneously in different zones; The control module regulates the opening and closing of the solenoid valve, the power of the vacuum pump, and the measurement range of the flowmeter according to the set program and measurement requirements; The data processing module is used to amplify, filter, denoise, and normalize the weak electrical signals output by the sensor array, perform digital conversion on the preprocessed signals, and analyze and process the data using the built-in algorithm; The data processing module is provided with an alarm device. The safety gas concentration threshold is set as X, and the detected target gas concentration value is ΔX, where X > 0; When ΔX < X, the target gas concentration is the normal gas concentration; When ΔX ≥ X, the target gas concentration is the dangerous gas concentration, and the alarm device is triggered; The gas recovery module is used to separate valuable gases from other gas mixtures and recover them.

2. The electronic nose gas detection system according to claim 1, wherein The acquisition module includes a baseline adjustment channel, a sampling channel, and an enrichment channel; the baseline adjustment channel is used to calibrate the baseline signal of the sensor, the sampling channel is used to absorb the target gas to be detected from the outside world, and the enrichment channel is used to aggregate and concentrate the target gas molecules, adsorb the target gas using an adsorbent. After a certain amount of gas is adsorbed on the surface of the adsorption material in the channel, it is quickly released near the sensor array through the desorption process.

3. The electronic nose gas detection system according to claim 2, wherein Before detecting the target gas, the gas reaction module first adjusts the electronic flowmeter to the initial value, then connects the standard gas for adjusting the baseline. After that, the control module controls the second solenoid valve to be energized, the normally closed channel to conduct, the third solenoid valve to be energized, the normally closed channel to conduct, and the fifth solenoid valve to be energized, changing from normally closed to a conducting path; the control module controls the first vacuum pump to be energized and start working, extracts the standard gas through the electronic flowmeter and the fifth solenoid valve, and enters different reaction zones through the gas path respectively; at the same time, the control module controls the sixth solenoid valve, the seventh solenoid valve, and the eighth solenoid valve to be energized and the gas paths to conduct, and the second vacuum pump starts to be energized and work to slowly discharge the gas in the reaction zone through the manual regulating valve at a speed that is first fast and then slow. During this process, observe the numerical changes of the sensors in the reaction zone. When the baseline is adjusted stably, the sensor baseline can be calibrated at this time.

4. The electronic nose gas detection system according to claim 3, wherein After calibrating the sensor baseline, the control module controls the first solenoid valve, the second solenoid valve, the third solenoid valve and the fifth solenoid valve to be powered off, the first vacuum pump is powered off, and the baseline adjustment channel stops supplying gas; the flow control of the manual flowmeter is adjusted, and the second vacuum pump continues to work to slowly extract the standard gas in the reaction area, reduce the concentration of the standard gas in the reaction chamber, and reduce the air pressure for the target gas to enter the reaction area; after the concentration in the reaction area is reduced, the sampling channel starts to take in air, the control module controls the first solenoid valve, the second solenoid valve, and the third solenoid valve to be powered on respectively, the fifth solenoid valve is turned on, and the first vacuum pump is started. Due to the pressure difference, the sampling gas quickly enters the reaction area and diffuses. When the sampling gas basically fills the reaction area, the control module controls the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve to be turned on respectively, the second vacuum pump is powered on, and the manual flowmeter is adjusted to overflow part of the target gas and the original standard gas in the reaction area. At this time, the fourth solenoid valve is turned on to discharge the gas. After the target gas fills the reaction area, all solenoid valves and pumps are powered off, and the sensor analyzes and reads stable gas readings.

5. The electronic nose gas detection system according to claim 1, characterized in that: The gas recovery module includes a pressure sensor for real-time monitoring of the pressure of the gas inside the recovery module. The pressure sensor is electrically connected to the alarm device. The monitored gas pressure inside the recovery module is ΔP. When 1<ΔP<5 standard atmospheric pressure, the gas pressure inside the recovery module is within the normal range; When 1 ≥ ΔP or 5 ≤ ΔP standard atmospheric pressure, the gas pressure inside the recovery module is outside the normal range and the alarm device is triggered.

6. The electronic nose gas detection system according to claim 1, characterized in that: The recovery methods of the gas recovery module include compression storage, adsorption storage, chemical reaction recovery and catalytic reaction recovery.

7. The electronic nose gas detection system according to claim 1, characterized in that: The gas recovery module includes a condensation component and a membrane separation component; the condensation component is used to reduce the gas temperature to below the boiling point of the target gas and convert the gas from gas to liquid; the membrane separation component is used for gas separation based on the selective permeation of gas molecules on both sides of the membrane.

8. The electronic nose gas detection system according to claim 1, characterized in that: The electronic nose gas detection system also includes a remote monitoring module for transmitting the system's detection data, the working status of each module, and alarm information to a mobile terminal device in real time.

9. The electronic nose gas detection system according to claim 8, characterized in that: The remote monitoring module first stores the data received by the detection system on the local device, and then regularly uploads the data to the cloud server for backup and sharing.

10. An electronic nose gas detection method, characterized in that: The following steps are involved: S100: Absorb the target gas from the outside. Before detecting the target gas, first adjust the electronic flow meter to the initial value, then connect the standard gas for adjusting the baseline, then the second solenoid valve is energized, the normally closed channel is turned on; the third solenoid valve is energized, the normally closed channel is turned on; the fifth solenoid valve is energized, and the normally closed channel becomes a passage; S200: The first vacuum pump is powered on and starts working, extracting the standard gas through the electronic flow meter and the fifth solenoid valve, and entering different reaction zones through the gas path; S300: The sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are electrically connected, and the second vacuum pump starts to be powered on to slowly discharge the gas in the reaction zone through the manual regulating valve at a speed first fast and then slow. During this process, the value change of the sensor in the reaction zone is observed. When the baseline adjustment is stable, the sensor baseline can be calibrated at this time; S400: After the sensor baseline is calibrated, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fifth solenoid valve are powered off, the first vacuum pump is powered off, and the baseline adjustment channel stops supplying gas; S500: adjusting the flow control of the manual flow meter, the second vacuum pump continues to work to slowly extract the standard gas in the reaction zone, reduce the concentration of the standard gas in the reaction chamber, and reduce the gas pressure for the target gas to enter the reaction zone; S600: After the concentration in the reaction zone decreases, the sampling channel starts to take in air, the first solenoid valve, the second solenoid valve, and the third solenoid valve are energized respectively, the fifth solenoid valve is turned on, and the first vacuum pump is started. Due to the pressure difference, the sampling gas quickly enters the reaction zone and diffuses; S700: When the sampled gas basically fills the reaction zone, the sixth solenoid valve, the seventh solenoid valve and the eighth solenoid valve are turned on respectively, the second vacuum pump is powered on, and the manual flow meter is adjusted to overflow part of the target gas and the original standard gas in the reaction zone. At this time, the fourth solenoid valve is turned on to discharge the gas; S800: After the target gas fills the reaction zone, all solenoid valves and pumps are powered off, and the sensor analyzes and reads the gas stable readings; S900: Separate and recycle the exhausted mixed gas.

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