Natural disaster geochemical gas monitoring system based on Beidou positioning

Abstract

The invention relates to a natural disaster geochemical gas monitoring system based on Beidou positioning. The natural disaster geochemical gas monitoring system comprises a microsampling control module, a sensing detection module, a signal processing module, an ARM control module and a Beidou positioning communication module, the micro sample injection control module comprises a sampling pump, a constant flow pump, a dust removal gasification pipe, a pretreatment quantification pipe, a constant temperature micro separation column and two electromagnetic valves, the sample gas inlet is sequentially connected with the dust removal gasification pipe and a common port of the first electromagnetic valve, and a first gas outlet of the first electromagnetic valve is sequentially connected with the sampling pump and the gas outlet; a second air outlet of the first electromagnetic valve is connected with a pretreatment quantitative pipe, the pretreatment quantitative pipe is connected with a public port of a second electromagnetic valve, a first air outlet of the second electromagnetic valve is sequentially connected with a constant flow pump and a constant-temperature micro-separation column, and an air outlet of the constant-temperature micro-separation column is connected with a sensing detection module; a second air outlet of the second electromagnetic valve is connected with air to serve as an air inlet. According to the invention, big data cloud platform monitoring and management of various gas concentrations and geographic information are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas geochemical analysis, and in particular relates to a natural disaster geochemical gas monitoring system based on Beidou positioning. Background Art

[0002] Geochemistry is the science that studies the chemical composition, chemical reactions and chemical evolution of the earth. Domestic and foreign studies have shown that natural disasters, especially volcanic eruptions, earthquakes, mudslides, landslides and tsunamis caused by crustal movement, will cause slight changes in the chemical components of gas, water, soil and rocks in geochemistry during their gestation, development and occurrence.

[0003] At present, the existing geochemical observation network adopts a regular flow observation method, that is, gas or water samples are captured at fixed sampling points and sent to the laboratory to analyze the chemical composition of the gas or water samples using gas chromatographs and ion chromatographs. This method uses laboratory equipment and has high analysis accuracy, but it has problems such as slow response, easy introduction of errors during sampling, and small amount of analysis data, which leads to missing subtle changes in geochemistry. With the in-depth construction of the geochemical observation network, the demand for on-site real-time online monitoring is increasing. In order to realize the scientific geochemical observation network formed by multiple locations and multiple measurement projects, a geochemical gas monitoring system with positioning, continuous observation, real-time analysis, and automation is urgently needed. Summary of the invention

[0004] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to solve at least one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a natural disaster geochemical gas monitoring system based on Beidou positioning that meets one or more of the aforementioned needs. It can analyze the chemical composition of gases in samples in situ and in real time online. It not only has the characteristics of automatic continuous monitoring, but also has the functions of positioning, data transmission and remote control. It is mainly used to detect the concentrations of hydrogen, helium, methane and carbon dioxide in the gas, and simultaneously monitor the ambient temperature, air pressure and sample temperature to realize synchronous online observation of multiple measurement items.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A natural disaster geochemical gas monitoring system based on Beidou positioning, comprising a micro-injection control module, a sensor detection module, a signal processing module, an ARM control module and a Beidou positioning communication module; the micro-injection control module is connected to the sensor detection module by a gas circuit, the sensor detection module outputs a signal to the signal processing module, the signal processing module outputs a measurement result to the ARM control module, the ARM control module stores data and transmits it to a cloud platform via the Beidou positioning communication module;

[0007] The micro-injection control module includes a sampling pump, a constant flow pump, a dust removal gasification tube, a pretreatment quantitative tube, a constant temperature micro separation column and two solenoid valves, the sample air inlet is sequentially connected to the dust removal gasification tube and the common port of the first solenoid valve, the first air outlet of the first solenoid valve is sequentially connected to the sampling pump and the air outlet, the second air outlet of the first solenoid valve is connected to the pretreatment quantitative tube, the pretreatment quantitative tube is connected to the common port of the second solenoid valve, the first air outlet of the second solenoid valve is sequentially connected to the constant flow pump and the constant temperature micro separation column, the air outlet of the constant temperature micro separation column is connected to the sensor detection module, and the second air outlet of the second solenoid valve is connected to air as an air inlet;

[0008] Among them, the pretreatment quantitative tube is used to dehumidify the gas and accurately measure the gas volume.

[0009] As a preferred solution, the micro-injection control module has three gas paths, namely:

[0010] Pre-sampling gas circuit: the sample air inlet, dust removal gasification tube, first solenoid valve, sampling pump and air outlet are connected in sequence;

[0011] Gas detection gas circuit: sample gas inlet, dust removal gasification tube, first solenoid valve, pretreatment quantitative tube, second solenoid valve, constant flow pump, constant temperature micro separation column, sensor detection module are connected in sequence;

[0012] Purification gas path: the air inlet, the second solenoid valve, the pretreatment quantitative tube, the first solenoid valve, the sampling pump and the air outlet are connected in sequence.

[0013] As a preferred solution, a filter membrane is built into one end of the air inlet of the dust removal gasification pipe, and a heating wire is wrapped on the outside.

[0014] As a preferred solution, a dehumidifying medium is provided in the pretreatment quantitative tube, and the pretreatment quantitative tube measures a fixed volume of gas;

[0015] Among them, a heating wire is arranged outside the pretreatment quantitative tube, a constant temperature cotton is wrapped outside the heating wire, and a temperature sensor is arranged inside the constant temperature cotton.

[0016] As a preferred solution, the dehumidification medium is color-changing silica gel, and the fixed volume is 1 to 5 mL.

[0017] As a preferred embodiment, the length of the isothermal micro-separation column is not less than 3 meters, and the inner diameter is 0.5 to 3 mm;

[0018] The filling medium in the constant temperature micro-separation column is a wood porous carbon-based material with a pore size distribution of 3 to 10 μm.

[0019] As a preferred solution, the sensing detection module includes a gas detection sensor, an ambient temperature sensor, an air pressure sensor and a sample temperature sensor, wherein the gas detection sensor includes at least two types of sensor arrays connected in series, wherein one sensor is a gas sensitive film sensor, and the other is a thermal conductivity sensor or an infrared non-dispersive sensor;

[0020] When measuring gas, it first passes through a thermal conductivity sensor or an infrared non-dispersive sensor, and then passes through a gas sensitive film sensor.

[0021] As a preferred solution, the ARM control module is an ARM single-chip microcomputer with a timer and a data storage card embedded therein;

[0022] The ARM control module communicates with the Beidou positioning communication module through the I2C bus.

[0023] As a preferred solution, the natural disaster geochemical gas monitoring system also includes a power control module for supplying power.

[0024] As a preferred solution, the monitoring process of the natural disaster geochemical gas monitoring system includes:

[0025] (1) The ARM control module starts the measurement at a fixed time, the first solenoid valve is connected to the sampling pump, the sample is pre-sampled through the pre-sampling gas line, the dead volume gas in the gas pipeline is extracted, and a fresh sample is collected;

[0026] (2) The first solenoid valve is connected to the pretreatment quantitative tube, the sampling pump stops working, the constant flow pump starts working, the sample is dusted, gasified, and dehumidified, enters the constant temperature gas micro separation column for time-sequential separation, and is output to the sensor detection module for detection;

[0027] (3) The signal processing module receives the signal output by the sensor detection module and outputs it to the ARM control module. The ARM control module saves the measurement results locally and transmits them to the cloud platform through the Beidou positioning communication module;

[0028] (4) The ARM control module performs a threshold judgment on the measurement result. If it is lower than the threshold, it waits for the next timed start. If it is higher than the threshold, it starts the frequency-increasing timed start measurement.

[0029] (5) During the measurement interval, the ARM control module starts the heating of the sampling pump and the pretreatment quantitative tube. The second solenoid valve is connected to the air, and the first solenoid valve is connected to the pretreatment quantitative tube and the sampling pump. The air purification circuit works, and the dehumidification medium of the pretreatment quantitative tube releases water vapor due to the heat, and dehumidification is automatically restored.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention adopts gas trace online collection technology. The gas collected on-site is subjected to dust removal, gasification, dehumidification, and time-series separation. The array sensor is used to realize synchronous online observation of multiple geochemical gases. The array sensor has a low gas detection limit, sensitive response, and real-time monitoring on-site, replacing laboratory sample delivery detection, and achieving the timeliness, systematicness and automation of geochemical local area network monitoring. The coordinate information of the monitor is obtained through Beidou positioning, and the measurement results of the monitoring site are obtained in real time, realizing big data cloud platform monitoring and management of multiple gas concentrations and geographic information. Based on the Beidou global short message communication mode, uninterrupted monitoring of geochemical gas analysis is realized when the public network is interrupted when a natural disaster occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a structural diagram of a natural disaster geochemical gas monitoring system based on Beidou positioning according to Example 1 of the present invention;

[0033] Figure 2 It is a gas path diagram of a natural disaster geochemical gas monitoring system based on Beidou positioning according to Example 1 of the present invention. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the embodiments of the present invention, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings and other implementation methods can be obtained based on these accompanying drawings without creative work.

[0035] Embodiment 1:

[0036] like Figure 1 As shown, the natural disaster geochemical gas monitor system based on Beidou positioning of this embodiment includes a trace injection control module 1, a sensor detection module 2, a Beidou positioning communication module 3, a signal processing module 4, an ARM control module 5 and a power control module 6. The trace injection control module is connected to the sensor detection module gas circuit, the sensor detection module outputs a signal to the signal processing module, the signal processing module outputs a measurement result to the ARM control module, the ARM control module stores the data and transmits it to the cloud platform after being encrypted by the Beidou positioning communication module, and the power control module supplies power to each module.

[0037] like Figure 2As shown, the micro-injection control module of this embodiment includes a sampling pump 11, a constant flow pump 12, a dust removal and gasification tube 13, a pretreatment quantitative tube 14, a constant temperature micro-separation column 15, a first solenoid valve 16 and a second solenoid valve 17 (both adopt three-way valves), the sample air inlet 10 is connected to the dust removal and gasification tube and the common port of the first solenoid valve in sequence, the first air outlet of the first solenoid valve is connected to the sampling pump and the air outlet 18 in sequence, the second air outlet of the first solenoid valve is connected to the pretreatment quantitative tube, the pretreatment quantitative tube is connected to the common port of the second solenoid valve, the first air outlet of the second solenoid valve is connected to the constant flow pump, the constant temperature micro-separation column to the sensor detection module in sequence, and the second air outlet of the second solenoid valve is connected to the air as the air inlet 19. Among them, the micro-injection control module contains three gas circuits: ① pre-sampling gas circuit, the sample air inlet, the dust removal gasification tube, the first solenoid valve, the sampling pump and the air outlet are connected in sequence for extracting samples; ② gas detection gas circuit, the sample air inlet, the dust removal gasification tube, the first solenoid valve, the pretreatment quantitative tube, the second solenoid valve, the constant flow pump and the constant temperature micro separation column are connected in sequence for dust removal, gasification, dehumidification and separation of the gas, and the gas circuit is connected to the sensor detection module; ③ purification gas circuit, the air inlet, the second solenoid valve, the pretreatment quantitative tube, the first solenoid valve, the sampling pump and the air outlet are connected in sequence for online removal of moisture in the pipeline and restoration of the dehumidification capacity of the medium in the pretreatment quantitative tube.

[0038] The flow rate of the above sampling pump is not less than 200mL / min, which quickly extracts the sample gas and removes the dead volume of the external sample sampling pipeline. The constant flow pump controls the gas through the gas pretreatment gas line at a fixed flow rate to ensure that the sample is completely gasified and dehumidified, and effectively separated in the constant temperature micro separation column.

[0039] The dust removal gasification pipe of this embodiment has a small-pore filter membrane built into one end of the air inlet, and a heating wire wrapped outside, which can quickly heat up to above 300°C. It can effectively block dust particles in the gas to prevent clogging the internal pipeline of the equipment. The dust removal gasification pipe uses high temperature to quickly gasify the gas.

[0040] The pretreatment quantitative tube of this embodiment uses a reusable dehumidification medium for adsorption dehumidification to prevent gas with water vapor from entering the subsequent analysis pipeline and causing condensation blockage; the pretreatment quantitative tube uses a fixed volume to measure a certain gas, so that the gas input to the sensor detection module is a fixed volume to complete the quantitative analysis. Specifically, the pretreatment quantitative tube of this embodiment is built with a reusable dehumidification medium for adsorption dehumidification, and the volume is fixed at 1 to 5 mL. The outside includes a heating wire, and the heating wire is wrapped with a constant temperature cotton. There is a temperature sensor on the constant temperature cotton, which can control the temperature to be constant at 100°C. Preferably, the dehumidification medium in the pretreatment quantitative tube is color-changing silica gel.

[0041] The constant temperature gas micro-separation column of this embodiment is not less than 3 meters in length, has an inner diameter of 0.5 to 3 mm, a pore size distribution of 3 to 10 μm, a filling medium of wood porous carbon-based material, and an external constant temperature controlled at 60°C.

[0042] The sensing detection module of this embodiment is a combination of multiple sensor arrays, including gas detection sensors, ambient temperature, air pressure and sample temperature sensors, wherein the gas detection sensor includes at least two types of sensor combinations, one of which is a gas-sensitive film sensor, and the other is a thermal conductivity sensor or an infrared non-dispersive sensor. The combination of the sensor array group is in series form. When measuring gas, it first passes through the thermal conductivity sensor or the infrared non-dispersive sensor, and then passes through the gas-sensitive film sensor. The gas-sensitive film sensor is mainly used to detect H 2 , CH 4 The concentration of the film material is generally a palladium-containing gas-sensitive composite film with high sensitivity to free hydrogen ions.

[0043] The ARM control module of this embodiment controls the start and stop of the pump and valve in the micro-injection module through the single-chip microcomputer, senses the constant temperature in the sensing detection module, receives the digital signal output by the signal processing module, and transmits the signal to the Beidou positioning communication module after the single-chip microcomputer operation and analysis. The data storage card embedded in the ARM control module can save the measurement results in real time. The ARM control module has a built-in threshold judgment timer. When it is lower than the alarm threshold, the ARM control module starts the pump and valve sampling detection at a fixed time. When the detection result is higher than the threshold, the ARM control module starts the pump and valve at a higher frequency and encrypts the sampling observation.

[0044] The signal processing module of this embodiment receives the signal output by the sensor detection module. Each sensor forms a signal through amplification, filtering, and A / D conversion. The signal is analyzed through data fusion, automatic interpretation, and index acquisition to obtain the results of each gas concentration, temperature, and air pressure, and output them to the ARM control module.

[0045] In this embodiment, there is bidirectional communication between the Beidou positioning communication module and the cloud platform. The measurement results on the ARM control module communicate with the Beidou positioning communication module using I2C. The Beidou positioning communication module encrypts the measurement results and uploads them to the cloud platform. The cloud platform configures the measurement parameters and communication parameters of the monitor.

[0046] The power control module of this embodiment includes a driving circuit, a protection circuit, and a floating charge circuit. The driving circuit provides a stable operating voltage for the micro-injection control module, the sensor detection module, the Beidou positioning communication module, the signal processing module, and the ARM control module. The protection circuit is connected to the power input of the device and has overvoltage, overcurrent, undervoltage, short circuit and other protections. The floating charge circuit is connected to the power output of the device and can reverse charge the battery.

[0047] The processing methods involved in the above-mentioned functional modules of this embodiment belong to the existing technology and will not be described in detail here.

[0048] The workflow of the natural disaster geochemical gas monitoring system based on Beidou positioning in this implementation case includes:

[0049] (1) The ARM control module starts the measurement at a fixed time, the first solenoid valve is connected to the sampling pump, the sample is pre-sampled through the pre-sampling gas line, the dead volume gas in the sampling gas pipeline is extracted, and a fresh sample is collected;

[0050] (2) The first solenoid valve is connected to the pretreatment quantitative tube, the sampling pump stops working, the constant flow pump starts working, the sample is dusted, gasified, and dehumidified, enters the constant temperature gas micro separation column for time-sequential separation, and is output to the sensor detection module for detection;

[0051] (3) The signal processing module receives the signal output by the sensor detection module and outputs it to the ARM control module. The ARM control module saves the measurement results locally and transmits them to the cloud platform through the Beidou positioning communication module;

[0052] (4) The ARM control module performs a threshold judgment on the measurement result. If it is lower than the threshold, it waits for the next timed start. If it is higher than the threshold, it starts the frequency-increasing timed start measurement.

[0053] (5) During the measurement interval, the ARM control module starts the sampling pump and the heating wire of the pretreatment quantitative tube. The second solenoid valve is connected to the air, and the first solenoid valve is connected to the pretreatment quantitative tube and the sampling pump. The air purification circuit works, and the dehumidification medium releases water vapor due to heat, thereby restoring the dehumidification capacity.

[0054] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, according to the ideas provided by the present invention, there will be changes in the specific implementation methods, and these changes should also be regarded as the protection scope of the present invention.

Claims

1. A natural disaster geochemical gas monitoring system based on Beidou positioning, characterized in that: It includes a micro-injection control module, a sensor detection module, a signal processing module, an ARM control module and a Beidou positioning communication module; the micro-injection control module is connected to the sensor detection module through a gas circuit, the sensor detection module outputs a signal to the signal processing module, the signal processing module outputs a measurement result to the ARM control module, the ARM control module stores the data and transmits it to the cloud platform via the Beidou positioning communication module; The micro-injection control module includes a sampling pump, a constant flow pump, a dust removal gasification tube, a pretreatment quantitative tube, a constant temperature micro separation column and two solenoid valves, the sample air inlet is sequentially connected to the dust removal gasification tube and the common port of the first solenoid valve, the first air outlet of the first solenoid valve is sequentially connected to the sampling pump and the air outlet, the second air outlet of the first solenoid valve is connected to the pretreatment quantitative tube, the pretreatment quantitative tube is connected to the common port of the second solenoid valve, the first air outlet of the second solenoid valve is sequentially connected to the constant flow pump and the constant temperature micro separation column, the air outlet of the constant temperature micro separation column is connected to the sensor detection module, and the second air outlet of the second solenoid valve is connected to air as an air inlet; Among them, the pretreatment quantitative tube is used to dehumidify the gas and accurately measure the gas volume.

2. The natural disaster geochemical gas monitoring system according to claim 1, characterized in that: The micro-injection control module has three gas paths, namely: Pre-sampling gas circuit: the sample air inlet, dust removal gasification tube, first solenoid valve, sampling pump and air outlet are connected in sequence; Gas detection gas circuit: sample gas inlet, dust removal gasification tube, first solenoid valve, pretreatment quantitative tube, second solenoid valve, constant flow pump, constant temperature micro separation column, sensor detection module are connected in sequence; Purification gas path: the air inlet, the second solenoid valve, the pretreatment quantitative tube, the first solenoid valve, the sampling pump and the air outlet are connected in sequence.

3. The natural disaster geochemical gas monitoring system according to claim 2, characterized in that: A filter membrane is built into one end of the air inlet of the dust removal gasification pipe, and a heating wire is wrapped outside.

4. The natural disaster geochemical gas monitoring system according to claim 2, characterized in that: The pretreatment quantitative tube is provided with a dehumidifying medium, and the pretreatment quantitative tube measures a fixed volume of gas; Among them, a heating wire is arranged outside the pretreatment quantitative tube, a constant temperature cotton is wrapped outside the heating wire, and a temperature sensor is arranged inside the constant temperature cotton.

5. The natural disaster geochemical gas monitoring system according to claim 4, characterized in that: The dehumidification medium is color-changing silica gel, and the fixed volume is 1 to 5 mL.

6. The natural disaster geochemical gas monitoring system according to claim 2, characterized in that: The constant temperature micro separation column has a length of not less than 3 meters and an inner diameter of 0.5 to 3 mm; The filling medium in the constant temperature micro-separation column is a wood porous carbon-based material with a pore size distribution of 3 to 10 μm.

7. The natural disaster geochemical gas monitoring system according to any one of claims 1 to 6, characterized in that: The sensing detection module includes a gas detection sensor, an ambient temperature sensor, an air pressure sensor, and a sample temperature sensor, wherein the gas detection sensor includes at least two types of sensor arrays connected in series, one of which is a gas-sensitive film sensor, and the other is a thermal conductivity sensor or an infrared non-dispersive sensor; When measuring gas, it first passes through a thermal conductivity sensor or an infrared non-dispersive sensor, and then passes through a gas sensitive film sensor.

8. The natural disaster geochemical gas monitoring system according to claims 1-6, characterized in that: The ARM control module is an ARM single-chip microcomputer with a timer and a data storage card embedded therein; The ARM control module communicates with the Beidou positioning communication module through the I2C bus.

9. The natural disaster geochemical gas monitoring system according to claims 1-6, characterized in that: A power control module is also included for supplying power.

10. The natural disaster geochemical gas monitoring system according to claims 2-6, characterized in that: The monitoring process includes: (1) The ARM control module starts the measurement at a fixed time, the first solenoid valve is connected to the sampling pump, the sample is pre-sampled through the pre-sampling gas line, the dead volume gas in the gas pipeline is extracted, and a fresh sample is collected; (2) The first solenoid valve is connected to the pretreatment quantitative tube, the sampling pump stops working, the constant flow pump starts working, the sample is dusted, gasified, and dehumidified, enters the constant temperature gas micro separation column for time-sequential separation, and is output to the sensor detection module for detection; (3) The signal processing module receives the signal output by the sensor detection module and outputs it to the ARM control module. The ARM control module saves the measurement results locally and transmits them to the cloud platform through the Beidou positioning communication module; (4) The ARM control module performs a threshold judgment on the measurement result. If it is lower than the threshold, it waits for the next timed start. If it is higher than the threshold, it starts the frequency-increasing timed start measurement. (5) During the measurement interval, the ARM control module starts the heating of the sampling pump and the pretreatment quantitative tube. The second solenoid valve is connected to the air, and the first solenoid valve is connected to the pretreatment quantitative tube and the sampling pump. The air purification circuit works, and the dehumidification medium of the pretreatment quantitative tube releases water vapor due to the heat, and dehumidification is automatically restored.

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