Geochemical multi-parameter field online monitoring system and monitoring method

Abstract

The invention relates to a geochemical multi-parameter field online monitoring system and a geochemical multi-parameter field online monitoring method. The system comprises a gas taking unit, a gas transmission unit, a monitoring unit and a data remote transmission unit, the gas taking unit, the gas transmission unit and the monitoring unit are sequentially connected through gas pipelines, and the monitoring unit is in communication connection with the data remote transmission unit; the gas transmission unit comprises an enrichment fractionation pipe, a three-way electromagnetic valve, a residual liquid bottle and a hydraulic water-sealed tank, a gas outlet of the gas taking unit is sequentially connected with the enrichment fractionation pipe and a public port of the three-way electromagnetic valve, a first gas outlet of the three-way electromagnetic valve is connected with the residual liquid bottle, and a gas outlet of the residual liquid bottle is connected with a gas inlet of the monitoring unit; and a second air outlet of the three-way electromagnetic valve is connected with the hydraulic water-sealed tank. The geochemical multi-parameter field online monitoring system and the geochemical multi-parameter field online monitoring method have the characteristics of automatic gas taking, real-time analysis and remote transmission, sampling, analysis, power supply, lightning protection and data communication are integrated, the integration degree is high, manual operation is not needed, and the analysis interference error is small.

Description

Technical Field

[0001] The invention belongs to the technical field of gas geochemical analysis, and in particular relates to a geochemical multi-parameter field online monitoring system and a monitoring method. Background Art

[0002] The gas inside the earth is the most sensitive and mobile fluid substance in the geochemical field. It can directly carry the deep earth information to the surface. Therefore, during the crustal activity, a large amount of deep earth information is released to the surface. The crustal activity can be judged by monitoring the surface gas. However, the release of deep crustal gas is usually carried out in a small scale and low speed, which is difficult to capture effectively. However, in some major escape channels of fault zones, the underground gas situation can be effectively observed. Hot springs, volcanoes and fault fracture zones are all underground gas escape channels. Therefore, the gas escaping from hot springs, volcanoes and fracture zones is a good indicator of fault activity.

[0003] An important means of studying gas geochemistry is the rare gas geochemistry method. The rare gases that are closely related to crustal activity and relatively sensitive include H2, He, CO2, CH4, Hg, Rn, etc. Studies have shown that these gases may show obvious abnormalities before or after an earthquake. Therefore, monitoring the escaped gas from the fault zone can monitor the crustal activity and then monitor the earthquake gestation and occurrence process.

[0004] In the prior art, the observation method used to study the relationship between gas geochemistry and crustal activity is to use a 500mL glass bottle to collect gas using the drainage gas collection method or to use a soil gas collection device to collect gas by enrichment and then put it into a sampling gas bag, and then bring it back to the laboratory for gas concentration analysis using a trace gas mass spectrometer or a gas chromatograph. This intermittent manual sampling and analysis method has an obvious earthquake reflection effect in the long-term observation of multiple fault zones, but its intermittent sampling causes the analysis to be delayed and it is easy to miss some small and medium-sized earthquake activity processes; in addition, the sampling process has a large number of artificial interference factors, which makes some gases with higher solubility or faster escape rate affected by the air, resulting in large analysis errors. Summary of the invention

[0005] 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 geochemical multi-parameter field online monitoring system and monitoring method that meets one or more of the above-mentioned needs.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0007] A geochemical multi-parameter field online monitoring system comprises a gas extraction unit, a gas transmission unit, a monitoring unit and a data remote transmission unit, wherein the gas extraction unit, the gas transmission unit and the monitoring unit are connected in sequence through a gas pipeline, and the monitoring unit is in communication connection with the data remote transmission unit;

[0008] Among them, the gas transmission unit includes an enrichment and distillation tube, a three-way solenoid valve, a residual liquid bottle and a hydraulic water seal tank. The gas outlet of the gas extraction unit is connected to the enrichment and distillation tube and the common port of the three-way solenoid valve in sequence. The first gas outlet of the three-way solenoid valve is connected to the residual liquid bottle, the gas outlet of the residual liquid bottle is connected to the gas inlet of the monitoring unit, and the second gas outlet of the three-way solenoid valve is connected to the hydraulic water seal tank.

[0009] As a preferred solution, the enrichment fractionation tube includes a vertical tube and an inclined tube, the bottom of the vertical tube is connected to the gas extraction unit, and the top is connected to the inclined tube, and the inner wall of the vertical tube is staggeredly distributed with cooling bosses from bottom to top, and the cooling bosses are cone structures, and the cone tip points to the radial center of the vertical tube;

[0010] The slope pipe includes an upwardly inclined section and a downwardly inclined section extending therefrom, the bottom end of the upwardly inclined section is connected to the top of the vertical pipe, and the bottom end of the downwardly inclined section is connected to the common port of the three-way solenoid valve.

[0011] As a preferred solution, the slope of the upward inclined section is 15 to 75°, and the slope of the downward inclined section is 30 to 60°.

[0012] As a preferred solution, the residual liquid bottle includes a first-stage gas-water separation bottle and a second-stage automatic drainage bottle. The water outlet of the first-stage gas-water separation bottle is higher than the water inlet of the second-stage automatic drainage bottle. The inlet of the first-stage gas-water separation bottle is connected to the first gas outlet of the three-way solenoid valve, the gas outlet is connected to the monitoring unit, the water outlet is connected to the water inlet of the second-stage automatic drainage bottle, and the water outlet of the second-stage automatic drainage bottle is naturally emptied.

[0013] As a preferred embodiment, the monitoring unit includes a multi-component separation column, a steady flow pump and a multi-parameter sensing detection module connected in sequence, the air inlet of the multi-component separation column is connected to the air outlet of the residual liquid bottle, the multi-parameter sensing detection module is electrically connected to the signal analysis circuit, and the signal analysis circuit communication serial port is connected to the data remote transmission unit.

[0014] As a preferred embodiment, the multi-component separation column is a micro-chromatographic column based on the principle of gas chromatography, which is used for chromatographic separation of H2, He, CO2, CH4, and Hg in the gas escaping from the earth's crust;

[0015] Among them, the filling medium of the multi-component separation column is a wood porous carbon-based material, the length of the separation column is not less than 3 meters, the inner diameter is 0.5 to 3 mm, and the pore size is 3 to 10 μm.

[0016] As a preferred solution, the multi-parameter sensing detection module includes a gas detection sensor, an ambient temperature sensor, an air pressure sensor and a sample temperature sensor;

[0017] Among them, the gas detection sensor includes a thermal conductivity sensor, an infrared spectrum sensor and a thin film gas sensor. The gas passes through the thermal conductivity sensor, the infrared spectrum sensor and the thin film gas sensitive array sensor in turn. The hydrogen sensitive film, the methane gas sensitive sensor, the carbon dioxide gas sensitive sensor and the mercury gas sensitive sensor are distributed in parallel in the gas chamber of the thin film gas sensitive array sensor. The hydrogen sensitive film is a palladium-doped tin oxide film, the methane gas sensitive sensor is a platinum-doped vanadium oxide film, the carbon dioxide gas sensitive sensor is a perovskite PrFeO3 nanoparticle-doped tin oxide film, and the mercury gas sensitive sensor is a nano-gold film.

[0018] As a preferred solution, the signal analysis circuit is used to receive the transient response signal output by the gas detection sensor, perform sample identification and cluster comparison on the signal, output the concentration value of each gas, and transmit it to the data remote transmission unit;

[0019] Among them, the signal analysis circuit sequentially identifies the characteristic peaks output by the thermal conductivity sensor and the intensity output by the infrared spectrum sensor, and then identifies the characteristic signals output by the thin film gas sensitive array sensor, clusters and compares the characteristic signals of the thin film gas sensitive array sensor with the corresponding characteristic peak heights output by the thermal conductivity sensor or the intensity output by the infrared spectrum sensor, and outputs the concentration value of each gas.

[0020] As a preferred solution, the air extraction unit adopts a submerged air collecting hood;

[0021] The geochemical multi-parameter field online monitoring system also includes an uninterruptible power supply unit and a lightning protection unit, which are used for power supply and lightning protection during the continuous operation of the online monitoring system.

[0022] The present invention also provides a monitoring method of a geochemical multi-parameter field online monitoring system as described in any of the above schemes, comprising the following process:

[0023] Place the air extraction unit in the area to be extracted, so that the air extraction unit is completely submerged below the water surface or below 3 meters of the shallow surface of the soil. The air extraction unit is completely isolated from the surface air by hot spring water seal or soil seal;

[0024] The gas transmission unit transmits the gas collected by the gas extraction unit to the monitoring unit or the air. When working, the three-way solenoid valve of the gas transmission unit is connected to the first gas outlet, and the excess hot spring liquid or condensed water is discharged through the gas outlet of the residual liquid bottle and then enters the monitoring unit. The monitoring unit analyzes the concentration of each component after multi-component separation, and transmits the analysis result to the data remote transmission unit, which outputs it to the user monitoring end;

[0025] When the work stops, the three-way solenoid valve of the gas transmission unit is connected to the second gas outlet, and the gas collected by the gas extraction unit is discharged into the air through the hydraulic water seal tank.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The geochemical multi-parameter field online monitoring system and monitoring method of the present invention have the characteristics of automatic gas extraction, real-time analysis, and remote transmission, and integrate sampling-analysis-power supply-lightning protection-data communication. The system has a high degree of integration, does not require manual operation, and has a small analysis interference error. The geochemical multi-parameter field online monitoring system adopts a submerged in-situ natural gas extraction method, uses automated gas transmission and analysis technology, realizes automatic sampling of hot spring or soil gas-continuous online analysis, and achieves real-time data transmission during the analysis process to meet the needs of real-time monitoring of crustal activity; the system automatically extracts gas, transmits gas, and exhausts gas, does not require manual operation, and can ensure the real-time nature of gas analysis, greatly improves the frequency of earthquake monitoring, reduces the time and error of manual sampling and analysis, and upgrades geochemical gas analysis from manual analysis to automatic analysis, improves the existing geochemical analysis method, and provides more accurate and detailed data for studying crustal activity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of a hot spring well geochemical multi-parameter field online monitoring system according to Example 1 of the present invention;

[0029] Figure 2 is a schematic structural diagram of an enrichment fractionation tube according to Example 1 of the present invention;

[0030] Figure 3 It is a structural diagram of the soil well geochemical multi-parameter field online monitoring system of Example 1 of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] Embodiment 1:

[0033] like Figure 1As shown, the hot spring well geochemical multi-parameter field online monitoring system of the present embodiment includes a gas extraction unit 1, a gas transmission unit, a monitoring unit 3, a data remote transmission unit 4, an uninterruptible power supply unit 5 and a lightning protection unit. The gas extraction unit 1, the gas transmission unit and the monitoring unit 3 are connected in sequence by gas pipelines, the monitoring unit 3 and the data remote transmission unit 4 are connected by communication serial ports, the uninterruptible power supply unit 5 is electrically connected to the gas transmission unit 2, the monitoring unit 3, and the data remote transmission unit 4 in sequence, and the lightning protection unit is embedded in the monitoring unit 3, the data remote transmission unit 4 and the uninterruptible power supply unit 5.

[0034] Specifically, the gas extraction unit 1 is a submerged gas collection hood, which is installed in the area where the escaped bubbles are concentrated in the hot spring well 0. It is made of stainless steel, with a polytetrafluoroethylene film on the surface, and the thickness of the film is not less than 3mm. The gas collection hood is cylindrical, hollow inside, and not less than 10cm in height. The diameter of the cylinder is set according to the diffusion area of ​​the hot spring bubbles or the diameter of the soil gas collection well. The top middle is opened with a hole diameter of not less than 5cm, and the arc angle transition is connected to the gas transmission unit 2. The gas extraction unit of the hot spring well is completely immersed in the hot spring water when installed, and the depth of 0.5 to 1.5 meters under the hot spring well is the best, so as to ensure that the gas extraction unit is completely isolated from the air through a certain thickness of water, so that the gas collected by the gas extraction unit can only be the gas escaping from the fault zone.

[0035] The gas transmission unit of this embodiment includes an enrichment and distillation tube 2-1, a three-way solenoid valve 2-2, a residual liquid bottle 2-3 and a hydraulic water seal tank 2-4. The gas outlet of the gas extraction unit is connected to the common port of the enrichment and distillation tube 2-1 and the three-way solenoid valve 2-2 in sequence. The first gas outlet of the three-way solenoid valve 2-2 is connected to the residual liquid bottle 2-3, the gas outlet of the residual liquid bottle is connected to the gas inlet of the monitoring unit 3, and the second gas outlet of the three-way solenoid valve is connected to the hydraulic water seal tank 2-4.

[0036] Furthermore, if Figure 2 As shown, the enrichment fractionation pipe 2-1 includes a vertical pipe 21a and an inclined pipe. The bottom of the vertical pipe 21a is connected to the gas extraction unit 1, and the top is connected to the inclined pipe. The cooling bosses 200 are staggered from bottom to top inside the vertical pipe. The cooling bosses 200 are cone structures, and the cone tip points to the radial center of the vertical pipe. One section of the inclined pipe is tilted upward to form an upward inclined section 21b, and the angle is between 15° and 75°. The other section is tilted downward to form a downward inclined section 21c connected to the three-way solenoid valve 2-2, and the angle is between 30° and 60°. The enrichment fractionation pipe 2-1 of this embodiment can effectively collect the gas of the gas extraction unit, and at the same time, utilize the upper and lower temperature difference of the vertical pipe and the cone of the cooling boss to condense the water vapor in the gas, so that when the gas passes through the inclined pipe, it flows back to the liquid surface of the gas extraction unit through the upward inclined section 21b, thereby achieving the effect of gas-liquid fractionation.

[0037] The residual liquid bottle 2-3 of this embodiment includes a first-stage gas-water separation bottle 23a and a second-stage automatic drainage bottle 23b. The water outlet of the first-stage gas-water separation bottle is higher than the water inlet of the second-stage automatic drainage bottle. The inlet of the first-stage gas-water separation bottle is connected to the first gas outlet of the three-way solenoid valve 2-2, the gas outlet is connected to the monitoring unit, the water outlet is connected to the water inlet of the second-stage automatic drainage bottle, and the water outlet of the second-stage automatic drainage bottle is naturally emptied.

[0038] The inlet of the hydraulic water seal tank 2-4 of this embodiment is connected to the second air outlet of the three-way solenoid valve 2-2, and the pipe is immersed in the bottom of the hydraulic water seal tank. The volume of the hydraulic water seal tank is not less than 5L. The volume of the hydraulic water seal tank is set according to the gas escape flow rate, and its air outlet is naturally emptied.

[0039] The monitoring unit 3 of this embodiment includes a multi-component separation column 3-1, a steady flow pump 3-2, a multi-parameter sensing detection module 3-3 and a signal analysis circuit. The gas transmission unit is connected to the multi-component separation column, the steady flow pump and the multi-parameter sensing detection module in sequence. The multi-parameter sensing detection module is electrically connected to the signal analysis circuit, and the signal analysis circuit is electrically connected to the data remote transmission unit. Among them, the steady flow pump extracts the escaping gas at a constant flow rate, so that the gas passes through the multi-component separation column slowly and evenly.

[0040] The multi-component separation column 3-1 is a micro-chromatographic column based on the principle of gas chromatography, which performs chromatographic separation on five gases, H2, He, CO2, CH4 and Hg, in the gas escaping from the earth's crust. The filling medium of the multi-component separation column is a wood porous carbon-based material. The length of the separation column is not less than 3 meters, the inner diameter is 0.5 to 3 mm, and the pore size distribution is 3 to 10 μm. When the gas passes through the multi-component separation column, the viscosity strength of the active bonds between each gas component and the porous carbon-based surface is different, resulting in the separation of the gas components in a short time sequence.

[0041] The multi-parameter sensing detection module of the present embodiment includes a gas detection sensor, an ambient temperature sensor, an air pressure sensor and a sample temperature sensor. The gas detection sensor includes a three-level sensor, wherein the first-level sensor is a thermal conductivity sensor, the second-level sensor is an infrared spectrum sensor, and the third-level sensor is a thin film gas sensitive array sensor. The gas passes through the first-level thermal conductivity sensor, the second-level infrared spectrum sensor and the third-level thin film gas sensitive sensor in sequence; wherein the thermal conductivity sensor measures the concentrations of H2, He, CO2, CH4 and Hg in the escaping gas; the infrared spectrum sensor mainly measures the concentrations of CO2 and CH4, and is used to broaden the detection range of gas concentration; the third-level sensor performs fine measurement according to the response objects of various gas sensors, and is used to improve the sensitivity of the sensor; specifically, a hydrogen sensitive film, a methane gas sensitive sensor, a carbon dioxide gas sensitive sensor and a mercury gas sensitive sensor are distributed in parallel in the gas chamber of the three-level thin film gas sensitive sensor, wherein the hydrogen sensitive film is a palladium-doped tin oxide film, the methane gas sensitive sensor is a platinum-doped vanadium oxide film, the carbon dioxide gas sensitive sensor is a perovskite PrFeO3 nanoparticle-doped tin oxide film, and the mercury gas sensitive sensor is a nano-gold film.

[0042] Furthermore, the signal analysis circuit is connected to the multi-parameter sensing detection module, and is used to receive the transient response signal output by the three-stage sensor array group, and perform sample identification and cluster comparison on the signal, output the concentration value of each gas, and transmit it to the data remote transmission unit. The signal analysis circuit sequentially identifies the characteristic peak output by the thermal conductivity sensor and the intensity output by the infrared non-dispersive sensor (i.e., infrared spectrum sensor), and then identifies the characteristic signal output by each gas-sensitive film sensor, clusters and compares the characteristic signal of the gas-sensitive film sensor with the corresponding characteristic peak height output by the thermal conductivity sensor or the intensity output by the infrared non-dispersive sensor, and outputs a complete set of values, i.e., the concentration value of each gas. The above-mentioned signal analysis circuit can be specifically referred to the prior art, and will not be described here.

[0043] The data transmission unit of this embodiment is a data transmission module based on network communication, which is used to transmit the detection results of the measuring point to the user monitoring terminal in real time. The data transmission unit uses a high-performance processor with ARM as the core to collect the data output by the monitoring unit, and adopts the data communication protocol of ultra-high frequency radio frequency identification and spread spectrum communication data transmission technology to realize point-to-point communication.

[0044] In order to ensure continuous online real-time measurement, the geochemical multi-parameter field online monitoring system of this embodiment uses an uninterruptible power supply unit to provide power, and provides supplementary power through large-capacity batteries or direct current power supplies such as solar energy and wind energy. At the same time, in order to ensure safe operation, the system is respectively provided with a secondary lightning protection module on the power supply unit, the monitoring unit and the data transmission unit. Among them, the first-level lightning protection is located in the power supply unit and includes a lightning protection ground network and a surge protector. The second-level lightning protection is located in the circuit of the monitoring unit and the data transmission unit, and a surge protector and overvoltage protection are provided.

[0045] Based on the above geochemical multi-parameter field online monitoring system, the monitoring method of this embodiment includes the following process:

[0046] The air extraction unit is placed in the area where bubbles are concentrated in the hot spring well, and it is ensured that the air extraction unit is completely immersed in the area below the water surface. The air extraction unit is sealed by the hot spring water seal to completely isolate the air extraction unit from the surface air; the gas transmission unit transmits the gas collected by the air extraction unit to the monitoring unit or the air, and the steady-flow pump in the monitoring unit works regularly. When working, the three-way solenoid valve of the gas transmission unit is connected to the first air outlet, and the excess hot spring liquid or condensed water is discharged through the air outlet of the residual liquid bottle and then enters the monitoring unit. The monitoring unit analyzes the concentration of each component after multi-component separation, and transmits the analysis results to the data remote transmission unit, which outputs them to the user monitoring end; when the steady-flow pump of the monitoring unit stops working, the three-way solenoid valve of the gas transmission unit is connected to the second air outlet, and the gas collected by the air extraction unit is discharged into the air through the hydraulic water seal tank to prevent the gas in the air extraction unit from accumulating to form a positive pressure cavity, causing the escaping gas channel to be blocked, resulting in untimely gas renewal, or lowering the water level to cause the air extraction unit to be exposed to the air.

[0047] Embodiment 2:

[0048] The soil well geochemical multi-parameter field online monitoring system of this embodiment is different from that of Embodiment 1 in that: the online monitoring system monitors a different environment, and the system architecture is consistent with that of Embodiment 1;

[0049] Specifically, Figure 3 As shown, the gas extraction unit 1 is installed in the area where bubbles are concentrated in the soil well 0', in the area below 3 meters of the shallow surface of the soil, to ensure that the gas extraction unit is completely isolated from the air through a certain thickness of soil, so that the gas collected by the gas extraction unit can only be the gas escaping from the fault zone;

[0050] For other structures, please refer to Example 1;

[0051] The monitoring method of the soil well geochemical multi-parameter field online monitoring system of this embodiment includes the following processes:

[0052] The gas extraction unit is placed in the area below 3 meters of the shallow surface of the soil, and it is ensured that the gas extraction unit is completely immersed in the area below 3 meters of the shallow surface of the soil. The gas extraction unit is sealed by the soil to completely isolate the gas extraction unit from the surface air; the gas transmission unit transmits the gas collected by the gas extraction unit to the monitoring unit or the air, and the steady-flow pump in the monitoring unit works regularly. When working, the three-way solenoid valve of the gas transmission unit is connected to the first air outlet, and the excess hot spring liquid or condensed water is discharged through the air outlet of the residual liquid bottle and then enters the monitoring unit. The monitoring unit performs multi-component separation and analyzes the concentration of each component, and transmits the analysis result to the data remote transmission unit, which outputs it to the user monitoring end; when the steady-flow pump of the monitoring unit stops working, the three-way solenoid valve of the gas transmission unit is connected to the second air outlet, and the gas collected by the gas extraction unit is discharged into the air through the hydraulic water seal tank to prevent the gas in the gas extraction unit from accumulating to form a positive pressure cavity, causing the escaping gas channel to be blocked, resulting in untimely gas renewal or lowering the water level to cause the gas extraction unit to be exposed to the air.

[0053] 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 geochemical multi-parameter field online monitoring system, characterized in that: It includes a gas extraction unit, a gas transmission unit, a monitoring unit and a data remote transmission unit, wherein the gas extraction unit, the gas transmission unit and the monitoring unit are connected in sequence through a gas pipeline, and the monitoring unit is communicatively connected with the data remote transmission unit; Among them, the gas transmission unit includes an enrichment and distillation tube, a three-way solenoid valve, a residual liquid bottle and a hydraulic water seal tank. The gas outlet of the gas extraction unit is connected to the enrichment and distillation tube and the common port of the three-way solenoid valve in sequence. The first gas outlet of the three-way solenoid valve is connected to the residual liquid bottle, the gas outlet of the residual liquid bottle is connected to the gas inlet of the monitoring unit, and the second gas outlet of the three-way solenoid valve is connected to the hydraulic water seal tank.

2. The geochemical multi-parameter field online monitoring system according to claim 1 is characterized in that: The enrichment fractionation pipe comprises a vertical pipe and an inclined pipe, the bottom of the vertical pipe is connected to the gas extraction unit, and the top is connected to the inclined pipe, and the inner wall of the vertical pipe is staggeredly distributed with cooling bosses from bottom to top, and the cooling bosses are cone structures, and the cone tip points to the radial center of the vertical pipe; The slope pipe includes an upwardly inclined section and a downwardly inclined section extending therefrom, the bottom end of the upwardly inclined section is connected to the top of the vertical pipe, and the bottom end of the downwardly inclined section is connected to the common port of the three-way solenoid valve.

3. The geochemical multi-parameter field online monitoring system according to claim 2 is characterized in that: The upwardly inclined section has an inclination of 15 to 75 degrees, and the downwardly inclined section has an inclination of 30 to 60 degrees.

4. The geochemical multi-parameter field online monitoring system according to any one of claims 1 to 3, characterized in that: The residual liquid bottle includes a first-stage gas-water separation bottle and a second-stage automatic drainage bottle. The water outlet of the first-stage gas-water separation bottle is higher than the water inlet of the second-stage automatic drainage bottle. The inlet of the first-stage gas-water separation bottle is connected to the first gas outlet of the three-way solenoid valve, the gas outlet is connected to the monitoring unit, the water outlet is connected to the water inlet of the second-stage automatic drainage bottle, and the water outlet of the second-stage automatic drainage bottle is naturally emptied.

5. The geochemical multi-parameter field online monitoring system according to any one of claims 1 to 3, characterized in that: The monitoring unit includes a multi-component separation column, a steady flow pump and a multi-parameter sensing detection module connected in sequence. The air inlet of the multi-component separation column is connected to the air outlet of the residual liquid bottle. The multi-parameter sensing detection module is electrically connected to the signal analysis circuit. The communication serial port of the signal analysis circuit is connected to the data remote transmission unit.

6. The geochemical multi-parameter field online monitoring system according to claim 5, characterized in that: The multi-component separation column is a micro-chromatographic column based on the principle of gas chromatography, which is used to perform chromatographic separation of H2, He, CO2, CH4, and Hg in the gas escaping from the earth's crust; Among them, the filling medium of the multi-component separation column is a wood porous carbon-based material, the length of the separation column is not less than 3 meters, the inner diameter is 0.5 to 3 mm, and the pore size is 3 to 10 μm.

7. The geochemical multi-parameter field online monitoring system according to claim 5, characterized in that: The multi-parameter sensing detection module includes a gas detection sensor, an ambient temperature sensor, an air pressure sensor and a sample temperature sensor; Among them, the gas detection sensor includes a thermal conductivity sensor, an infrared spectrum sensor and a thin film gas sensor. The gas passes through the thermal conductivity sensor, the infrared spectrum sensor and the thin film gas sensitive array sensor in turn. The hydrogen sensitive film, the methane gas sensitive sensor, the carbon dioxide gas sensitive sensor and the mercury gas sensitive sensor are distributed in parallel in the gas chamber of the thin film gas sensitive array sensor. The hydrogen sensitive film is a palladium-doped tin oxide film, the methane gas sensitive sensor is a platinum-doped vanadium oxide film, the carbon dioxide gas sensitive sensor is a perovskite PrFeO3 nanoparticle-doped tin oxide film, and the mercury gas sensitive sensor is a nano-gold film.

8. The geochemical multi-parameter field online monitoring system according to claim 7, characterized in that: The signal analysis circuit is used to receive the transient response signal output by the gas detection sensor, perform sample identification and cluster comparison on the signal, output the concentration value of each gas, and transmit it to the data remote transmission unit; Among them, the signal analysis circuit sequentially identifies the characteristic peaks output by the thermal conductivity sensor and the intensity output by the infrared spectrum sensor, and then identifies the characteristic signals output by the thin film gas sensitive array sensor, clusters and compares the characteristic signals of the thin film gas sensitive array sensor with the corresponding characteristic peak heights output by the thermal conductivity sensor or the intensity output by the infrared spectrum sensor, and outputs the concentration value of each gas.

9. The geochemical multi-parameter field online monitoring system according to any one of claims 1 to 3, characterized in that: The air extraction unit adopts a submerged air collecting hood; The geochemical multi-parameter field online monitoring system also includes an uninterruptible power supply unit and a lightning protection unit, which are used for power supply and lightning protection during the continuous operation of the online monitoring system.

10. The monitoring method of the geochemical multi-parameter field online monitoring system according to any one of claims 1 to 9, characterized in that: The process includes: Place the air extraction unit in the area to be extracted, so that the air extraction unit is completely submerged below the water surface or below 3 meters of the shallow surface of the soil. The air extraction unit is completely isolated from the surface air by hot spring water seal or soil seal; The gas transmission unit transmits the gas collected by the gas extraction unit to the monitoring unit or the air. When working, the three-way solenoid valve of the gas transmission unit is connected to the first gas outlet, and the excess hot spring liquid or condensed water is discharged through the gas outlet of the residual liquid bottle and then enters the monitoring unit. The monitoring unit analyzes the concentration of each component after multi-component separation, and transmits the analysis result to the data remote transmission unit, which outputs it to the user monitoring end; When the work stops, the three-way solenoid valve of the gas transmission unit is connected to the second gas outlet, and the gas collected by the gas extraction unit is discharged into the air through the hydraulic water seal tank.

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