In-situ detection device and method for methane and carbon dioxide in seawater

Abstract

The invention relates to a seawater methane and carbon dioxide in-situ detection device and a method thereof.The seawater methane and carbon dioxide in-situ detection device comprises a detection box, a water pump, a sample reserving chamber, a sample bin, a nitrogen tank, a water storage chamber, an electric module, a detection chamber and a control module, and the water pump, the sample reserving chamber, the sample bin, the nitrogen tank, the water storage chamber, the electric module, the detection chamber and the control module are arranged in the detection box; a water outlet of the water pump is connected with a water inlet end of the sample bin, a sample output end of the sample bin is connected with the sample reserving chamber, an exhaust end of the sample bin is connected with the detection chamber, and a methane sensor and a carbon dioxide sensor which are electrically connected with the control module are arranged in the detection chamber; the electric module is used for conveying a water sample in the water storage chamber and nitrogen in the nitrogen tank to the sample bin. The device is reasonable in design, can perform in-situ detection on methane and carbon dioxide in seawater outdoors, is simple to operate, reduces time consumption, can be operated without professional technicians, and provides technical support for dynamically and timely mastering the content of methane in seawater.

Description

Technical Field

[0001] The invention relates to an in-situ detection device and method for seawater methane and carbon dioxide. Background Art

[0002] The ocean is one of the largest carbon reservoirs on Earth, and dissolved carbon dioxide and methane in seawater are important components of greenhouse gases. By measuring the methane and carbon dioxide levels in seawater, global greenhouse gas emissions can be more accurately calculated. For example, the ocean absorbs a large amount of atmospheric carbon dioxide each year, accounting for approximately one-third of global carbon dioxide emissions. Although methane concentrations in seawater are relatively low, its greenhouse effect is dozens of times more potent than that of carbon dioxide, making accurate accounting of its emissions crucial for assessing its contribution to the global greenhouse effect. Furthermore, the ocean is home to a large number of microorganisms that produce or consume methane and carbon dioxide through respiration and metabolic processes. Therefore, measuring changes in methane and carbon dioxide in seawater can provide insights into the role of marine ecosystems in the global carbon cycle and the feedback mechanisms of these processes on climate change.

[0003] However, the current detection of methane and carbon dioxide in seawater usually requires collecting water samples and transporting them back to the laboratory, and then using headspace equilibrium-gas chromatography for detection. This method has cumbersome operating steps, is time-consuming, and requires professional technicians to operate. Summary of the Invention

[0004] The present invention aims to improve upon the problems of the prior art. Specifically, the present invention aims to provide an in-situ detection device and method for seawater methane and carbon dioxide, which are rationally designed and provide technical support for dynamically and timely grasping the methane content in seawater.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an in-situ detection device for seawater methane and carbon dioxide, comprising a detection box, a water pump arranged in the detection box, a sample retention chamber, a sample bin, a nitrogen tank, a water storage chamber, an electric module, a detection chamber and a control module, the water inlet of the water pump is connected to a pumping pipe for extending into seawater, the water outlet of the water pump is connected to the water inlet end of the sample bin, the sample output end of the sample bin is connected to the sample retention chamber, the exhaust end of the sample bin is connected to the detection chamber, and the detection chamber is provided with a methane sensor and a carbon dioxide sensor electrically connected to the control module; the electric module is used to transport the water sample in the water storage chamber and the nitrogen in the nitrogen tank to the sample bin.

[0006] Furthermore, the interior of the detection box is provided with a first support plate, a second support plate and a third support plate, which are spaced apart from each other, in sequence from bottom to top. The sample retention chamber and the water pump are both provided on the first support plate and are distributed on the left and right; the sample bin and the nitrogen tank are both provided on the second support plate, the nitrogen tank is located on the right side of the sample bin, and a terminal box is provided on the left side of the sample bin; the control module, the detection chamber, the electric module and the water storage chamber are provided on the third support plate in sequence from left to right.

[0007] Furthermore, a first solenoid valve is installed on the water suction pipe; the sample chamber is connected to a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe, the first connecting pipe is connected to the water outlet of the water pump, and the first connecting pipe is provided with a second solenoid valve; the second connecting pipe is connected to the sample retention chamber, and the second connecting pipe is provided with a fourth solenoid valve; the third connecting pipe is connected to the detection chamber, and the third connecting pipe is provided with a fifth solenoid valve, the fourth connecting pipe is connected to the electric module, and the fourth connecting pipe is provided with a third solenoid valve.

[0008] Furthermore, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve and the four-way solenoid valve are all electrically connected to the control module.

[0009] Furthermore, a liquid level sensor and a thermometer are provided in the sample chamber, and both the liquid level sensor and the thermometer are electrically connected to the control module.

[0010] Furthermore, the electric module includes a vertically arranged syringe, the push rod of the syringe is driven up and down by an electric screw arranged above, the output end of the syringe is connected to a four-way solenoid valve, the four-way solenoid valve is connected to the sample chamber, the nitrogen tank and the water storage chamber, and the four-way solenoid valve is electrically connected to the control module.

[0011] Furthermore, a vacuum pump is provided on the left side of the detection chamber. The vacuum pump is connected to the detection chamber via a vacuum pipe, and the vacuum pump is used to vacuum the detection chamber.

[0012] Furthermore, the control module includes a protective box, in which a controller, a memory and a battery are installed. The controller is used to receive and process information transmitted by the methane sensor and the carbon dioxide sensor, the battery is used to power the controller, and the memory is used to store information of the controller; a partition is vertically installed in the terminal box, and the partition separates the terminal box into a control area on the left and a display area on the right. The left control area is installed with control buttons, and the right display area is installed with a display screen. The control buttons and the display screen are both electrically connected to the controller.

[0013] Furthermore, sample bottles are provided in the sample retention room; universal wheels are installed at the four top corners of the bottom of the detection box; door openings are provided on the front sides of the sample retention room, terminal box, electric module and protective box, and protective doors are hinged in the door openings for sealing the door openings. A ventilation hole is opened on the protective door of the protective box, and a dustproof net is installed in the ventilation hole.

[0014] Another technical solution adopted by the present invention is: a method for in-situ detection of methane and carbon dioxide in seawater, during detection: open the first solenoid valve and the second solenoid valve, pump seawater into the sample chamber, and after the liquid level sensor detects that the sample chamber is full of water, close the first solenoid valve and the second solenoid valve; turn on the nitrogen switch of the nitrogen tank, switch the four-way solenoid valve of the electric module to open only the nitrogen channel connected to the nitrogen tank, turn on the motor switch of the electric screw, and the electric screw drives the push rod of the syringe to move upward. At this time, an appropriate amount of nitrogen enters the syringe cavity, and close the nitrogen switch of the nitrogen tank; switch the four-way solenoid valve to the channel connected to the sample chamber, open the third solenoid valve and the fourth solenoid valve, and the push rod of the injection cavity moves downward under the drive of the electric screw motor to inject the nitrogen in the syringe cavity into the sample chamber, and the water sample of the same volume is transferred from the sample chamber to the sample bottle in the sample retention room, and close the third solenoid valve and the fourth solenoid valve; let the water sample in the sample chamber stand, and wait for the sample After the water-gas balance in the chamber, the four-way solenoid valve is switched to the channel connected to the water storage chamber, and the electric screw drives the push rod of the syringe to move upward, and the water sample with the same volume as the above-mentioned nitrogen in the water storage chamber enters the injection chamber of the syringe cavity; the four-way solenoid valve is switched to the channel connected to the sample chamber again, and the third solenoid valve and the fifth solenoid valve are opened at the same time. The push rod of the syringe moves downward under the drive of the electric screw, and the water sample in the syringe cavity of the syringe cavity is injected into the sample chamber under the drive of the motor. The gas above the sample chamber is squeezed into the detection box chamber, and the third solenoid valve and the fifth solenoid valve are closed; the methane sensor and the carbon dioxide sensor detect the methane and carbon dioxide content entering the detection box chamber, and the methane sensor and the carbon dioxide sensor transmit the detected data information to the controller. After the controller processes the data, it is displayed on the display screen, thereby realizing the in-situ detection of methane and carbon dioxide in seawater at the same time.

[0015] Compared with the existing technology, the present invention has the following effects: the present invention has a reasonable design and can perform in-situ detection of methane and carbon dioxide in seawater outdoors. The operation is simple and time-saving, and it can be operated without the need for professional technicians, providing technical support for dynamic and timely grasp of the methane content in seawater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic diagram of the main structure of an embodiment of the present invention; Figure 2 yes Figure 1 Schematic diagram of the internal structure; Figure 3 Schematic diagram of the structure of the electric module in an embodiment of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 5 Schematic diagram of the working process of an embodiment of the present invention.

[0017] In the picture: 1-Detection box; 11-Box door; 111-Ventilation fan; 12-Universal wheel; 13-Hose channel; 2-First support plate; 21-Water pump; 211-Interface; 212-First solenoid valve; 213-Water extraction pipe; 214-First connecting pipe; 215-Second connecting pipe; 216-Third connecting pipe; 217-Fourth connecting pipe; 22-Sample room; 221-Sample bottle; 222-Limiting plate; 3-Second support plate; 31-Nitrogen tank; 311-Nitrogen switch; 32-Sample chamber; 321-Liquid level sensor; 322-Sealing plug; 323-Second solenoid valve; 324-Third solenoid valve; 325-Fourth solenoid valve; 326-Fifth solenoid valve; 327- Thermometer; 33-terminal box; 331-horizontal partition; 332-control button area; 333-display screen; 334-vertical partition; 4-third support plate; 41-water storage chamber; 42-electric module; 421-electric screw; 422-syringe; 423-upper fixing plate; 424-lower fixing plate; 425-upper groove; 426-lower groove; 427-four-way solenoid valve; 43-detection chamber; 431-methane sensor; 432-carbon dioxide sensor; 433-vacuum pump; 434-sixth solenoid valve; 435-vacuum tube; 44-protective box; 441-controller; 442-memory; 443-battery; 444-protective door; 445-ventilation port. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] like Figures 1 to 5As shown, the present invention is an in-situ detection device for seawater methane and carbon dioxide, comprising a detection box 1, a water pump 21 arranged in the detection box 1, a sample chamber 22, a sample bin 32, a nitrogen tank 31, a water storage chamber 41, an electric module 42, a detection chamber 43 and a control module, wherein the water inlet of the water pump 21 is connected to a pumping pipe 213 for extending into seawater, and the water outlet of the water pump 21 is connected to the water inlet end of the sample bin 32 so that the seawater is pumped into the sample bin 32 by the water pump; the sample output end of the sample bin 32 is connected to the sample chamber 22, and the exhaust end of the sample bin 32 is connected to the detection chamber 43; a methane sensor 431 and a carbon dioxide sensor 432 electrically connected to the control module are provided in the detection chamber 43, the methane sensor 431 is used to detect the methane concentration, and the carbon dioxide sensor 432 is used to detect the carbon dioxide concentration; the electric module 42 is used to transport the water sample in the water storage chamber 41 and the nitrogen in the nitrogen tank 31 to the sample bin 32.

[0021] In this embodiment, the interior of the detection box 1 is provided with a first support plate 2, a second support plate 3 and a third support plate 4, which are spaced apart from each other, from bottom to top. The first support plate 2, the second support plate 3 and the third support plate 4 are all arranged horizontally; the sample retention chamber 22 and the water pump 21 are both arranged on the first support plate 2 and are distributed on the left and right; the sample bin 32 and the nitrogen tank 31 are both arranged on the second support plate 3, the nitrogen tank 31 is located on the right side of the sample bin 32, and a nitrogen switch 311 is provided at the air outlet end of the nitrogen tank 31, and a terminal box 33 is provided on the left side of the sample bin 32; the control module, the detection chamber 43, the electric module 42 and the water storage chamber 41 are arranged on the third support plate 4 from left to right.

[0022] In this embodiment, a first solenoid valve 212 is installed at the end of the suction pipe 213 away from the water pump. The first solenoid valve 212 is used to control the opening and closing of the suction pipe. The suction pipe is made of a hose and is detachably connected to the water inlet of the water pump 21 via an interface 214. The opening and closing of the suction pipe 213 is controlled by the first solenoid valve 212. The first solenoid valve 212 is installed at the end of the suction pipe 213 away from the water pump 21. When the suction pipe 213 is placed in seawater for water sampling, this prevents part of the water sample from entering the suction pipe 213 before the suction pipe 213 reaches the water layer from which the water sample is to be collected. In actual application, by adjusting the length of the suction pipe 213 inserted into the water, seawater samples at different levels can be collected.

[0023] In this embodiment, the sample chamber 32 is a sealed structure as a whole. The sample chamber 32 is connected to the water pump 21, the sample retention chamber 22, the electric module 42 and the detection chamber 43 through four connecting pipes. Specifically, the four connecting pipes are the first connecting pipe 214, the second connecting pipe 215, the third connecting pipe 216 and the fourth connecting pipe 217. The first connecting pipe 214, the second connecting pipe 215, the third connecting pipe 216 and the fourth connecting pipe 217 are connected to the top cover of the sample chamber 32 with sealing plugs 322. The first connecting pipe 214 connects the sample chamber 32 with the water outlet of the water pump 21 and is provided with a second solenoid valve 323. The second connecting pipe 215 connects the sample chamber 32 with the sample retention chamber 22 and is provided with a fourth solenoid valve 325. The third connecting pipe 216 connects the sample chamber 32 with the detection chamber 43 to facilitate the entry of gas within the sample chamber into the detection chamber. The third connecting pipe 216 is provided with a fifth solenoid valve 326. The fourth connecting pipe 217 is connected to the output end of the electric module 42 and is provided with a third solenoid valve 324. In actual use, the second solenoid valve 323 controls the volume of seawater entering the sample chamber 32 from the water pump 21, the fourth solenoid valve 325 controls the volume of seawater entering the sample retention chamber 22 from the sample chamber 32, and the third solenoid valve 324 controls the volume of water sample and nitrogen entering the sample chamber 32 from the electric module 42.

[0024] In this embodiment, the electric module 42 includes a vertically arranged syringe 422, and the syringe 422 includes a vertically arranged syringe and a push rod cooperating with the syringe. The push rod of the syringe 422 is driven up and down by an electric screw 421 arranged above. The syringe output port of the syringe 422 is connected to a four-way solenoid valve 427, and the four-way solenoid valve 427 is connected to the sample chamber 32, the nitrogen tank 31 and the water storage chamber 41. The four-way solenoid valve 427 is electrically connected to the control module. The four-way solenoid valve drives the valve core to move through the magnetic field of the electromagnetic coil to realize flow path switching.

[0025] Further, such as Figure 3 As shown, the electric module 42 also includes an upper fixing plate 423 and a lower fixing plate 424. The upper fixing plate 423 is connected to the push rod of the syringe 422 via an adjustable bolt. The electric screw 421 is connected to the upper fixing block 423. The lower fixing plate 424 secures the syringe 422's barrel via an upper groove 425 and a lower groove 426. The depth and width of the upper and lower grooves closely match the syringe. In actual use, the syringe 422 is installed and removed by adjusting the bolts of the upper fixing plate 423. During installation, the syringe barrel must first be locked into the upper and lower grooves of the lower fixing plate.

[0026] It should be noted that an electric lead screw, also known as an electric push rod, push rod motor, electric cylinder, or linear actuator, is an electric drive device that converts the rotational motion of a motor into the linear reciprocating motion of a push rod. Its structure and operating principle are both prior art and will not be further elaborated here.

[0027] In this embodiment, Figure 1 As shown, the control module includes a protective box 44, in which a horizontal partition 331 is horizontally installed. The horizontal partition 331 divides the protective box 44 into an upper protection area and a lower protection area. The upper protection area is equipped with a controller 441 and a memory 442. The controller 441 is electrically connected to the memory 442 for storing data information. In actual application, the controller 441 is used to receive and process the information transmitted by the methane sensor 431 and the carbon dioxide sensor 432, and the memory 442 is used to store the detected data to prevent the loss of the detected data. A battery 443 is installed in the lower protection area; the battery 443 is installed at the inner bottom of the protective box 44, and the detection device is powered by the battery 443, so that in-situ detection can be achieved without an external power supply. It should be noted that the controller 441 can be a single-chip microcomputer or a PLC controller.

[0028] In this embodiment, Figure 1 、 2 As shown, the methane sensor 431 and the carbon dioxide sensor 432 are fixed to the top of the detection box 43 by screws or brackets.

[0029] In this embodiment, a vertical partition 334 is vertically installed in the terminal box 33. The vertical partition 331 divides the terminal box 33 into a control area on the left and a display area on the right. The control area on the left is installed with a control button area 332, and the display area on the right is installed with a display screen 333. The control button area 332 and the display screen 333 are both electrically connected to the controller 441.

[0030] In this embodiment, a liquid level sensor 321 and a thermometer 327 are provided within the sample chamber 32. These are electrically connected to the controller 441 of the control module via wires. In actual use, the liquid level sensor 321 and thermometer 327 transmit water level and temperature information within the sample chamber 32 to the controller 441. The controller 441 receives and processes the water level information and displays it on a display screen.

[0031] In this embodiment, a vacuum pump 433 is provided on the left side of the detection chamber 43. The vacuum pump 433 is electrically connected to a controller 441. A vacuum pump 435 connects the vacuum pump 433 and the detection chamber 43. A sixth solenoid valve 434 is provided at the air inlet of the vacuum pump 433, which is also connected to the controller 441. Before water sample testing, the vacuum pump 433 evacuates the air in the detection chamber 43, creating a vacuum state within the detection chamber 43 and eliminating interference from methane and carbon dioxide in the air. It should be noted that in actual applications, the sensor type can be replaced with other gas sensors, such as an oxygen sensor, a nitrous oxide sensor, a nitrogen sensor, a hydrogen sulfide sensor, etc., as needed.

[0032] In this embodiment, the first solenoid valve 212, the second solenoid valve 323, the third solenoid valve 324, the fourth solenoid valve 325, the fifth solenoid valve 326, the nitrogen switch 311, the sixth solenoid valve 434, and the four-way solenoid valve 427 are all connected to the control button area 332 via wires. The first solenoid valve 212, the second solenoid valve 323, the third solenoid valve 324, the fourth solenoid valve 325, the fifth solenoid valve 326, the nitrogen switch 311, the sixth solenoid valve 434, and the four-way solenoid valve 427 can be controlled and opened and closed via the control button area 332. The opening and closing status of the motors of the solenoid valves and the electric screw can be displayed on the display screen 333 via the controller 441. Information detected by the liquid level sensor and thermometer is also displayed on the display screen. Information detected by the methane sensor 431 and the carbon dioxide sensor 432 can also be displayed on the display screen 333 via the controller 441.

[0033] In this embodiment, Figure 2 As shown, the sample storage room 22, terminal box 33, electric module 42, and protective box 44 are each provided with a door opening on the front side wall. A protective door 444 is hingedly connected to the door opening for sealing the door opening. The protective door 444 of the protective box 44 is provided with a vent, and a dust screen 445 is installed in the vent. The protective door 444 is mounted in the door opening via a hinge or hinge. In actual use, the sample storage room 22, intelligent terminal box 33, electric module 42, and protective box 44 components can be accessed and used, or maintained and replaced, by opening the protective door 444. The vent dissipates heat from the interior of the protective box 44, and the dust screen 445 prevents external dust from entering the interior of the protective box 44 through the vent.

[0034] In this embodiment, Figure 1As shown, a sample bottle 221 is placed in the sample chamber 22, and a limit plate 222 is horizontally installed in the sample chamber 22. The limit plate 222 is provided with a plurality of limit holes that are connected from left to right and are connected to each other. The limit holes are used to limit the position of the sample bottle 221. The left end of the limit plate 222 is installed on the left inner wall of the sample chamber 22, and the right end of the limit plate 222 is installed on the right inner wall of the sample chamber 22. When the sample bottle 221 is placed in the sample chamber 22, the sample bottle 221 is passed through the limit hole. In actual application, the water sample entering the sample chamber 22 from the sample bin 32 is received by the sample bottle 221, the water sample for detection is retained, and the sample bottle 221 is stored in the sample chamber 22.

[0035] In this embodiment, Figure 1 and Figure 4 The door 11 of the detection box 1 is provided with a ventilation window, and a ventilation fan 111 is installed in the ventilation window. In actual use, the ventilation fan 111 in the ventilation window is used to dissipate heat and ventilate the interior of the detection box 1. A hose channel 13 is installed at the bottom of the right side of the detection box 1. The installation position of the hose channel 13 is slightly lower than the water pump interface 211. The water pump 21's suction pipe 213 is a detachable structure and extends to the outside of the detection box 1 through the hose channel 13. In actual use, one end of the suction pipe 213 is installed on the interface 211 of the water pump 21 through the hose channel 13. When sampling, the suction pipe 213 extends through the hose channel 13 into the seawater to collect water samples.

[0036] In this embodiment, universal wheels 12 are installed at the four top corners of the bottom of the detection box 1. Figure 4 As shown, the universal wheels 12 have a self-locking function, and the four universal wheels 12 are distributed in a rectangular shape as a whole, so that the entire mobile device can be pushed to move by the four universal wheels.

[0037] In this embodiment, the controller 441 processes the methane and carbon dioxide concentrations (mg / L) measured by the methane sensor 431 and the carbon dioxide sensor 432 to convert them into molar concentrations (mol / L) of methane and carbon dioxide in seawater. The conversion formula is as follows: (1) Convert the methane and carbon dioxide concentrations (mg / L) measured by the methane sensor 431 and the carbon dioxide sensor 432 into molar concentrations: : methane and carbon dioxide concentrations (mg / L) measured by the methane sensor 431 and the carbon dioxide sensor 432; P 总 : Usually atmospheric pressure (Pa); R : gas constant (8.314 J / (mol·K)); T : Sample chamber equilibrium temperature (K, T=273.15+℃).

[0038] (2) Methane concentration in water: K H : Henry coefficient, methane and carbon dioxide in water at different temperatures K H Can be searched through literature.

[0039] Units converted to molar concentration (mol / L): M : Molar masses of methane and carbon dioxide.

[0040] In this embodiment, during detection, the specific steps are as follows: (1) Open the door 11 of the detection box 1, open the sixth solenoid valve 434 through the control button area 332, start the vacuum pump, and evacuate the gas in the detection chamber 43; (2) Place one end of the water extraction pipe 213 equipped with the first solenoid valve 212 into the seawater. When the water extraction pipe 213 reaches the water intake layer, open the first solenoid valve 212 and the second solenoid valve 323 and start the water pump 21 through the control button area 332 to pump the seawater into the sample chamber 32. Observe the information transmitted by the liquid level sensor 321 on the display screen 333. When the sample chamber is full of water, immediately close the first solenoid valve 212, the second solenoid valve 323 and the water pump 21. (3) The flow path of the four-way solenoid valve 427 is adjusted through the control button area 332 to open the communication channel between the nitrogen tank 31 and the syringe 422, and the nitrogen switch 311 is turned on. Then, the electric screw 421 is started through the control button area 332. The electric screw 421 drives the push rod of the syringe 422 to move upward, and a certain volume of nitrogen enters the cavity of the syringe 422 from the nitrogen tank 31. The nitrogen switch 311 is closed, and the electric screw 421 is closed; (4) Regulate the flow path of the four-way solenoid valve 427 through the control button area 332, open the communication channel between the sample chamber 32 and the syringe 422, open the third solenoid valve 324 and the fourth solenoid valve 325, start the electric screw 421, and the electric screw 421 drives the push rod of the syringe 422 to move downward. The nitrogen in the inner cavity of the syringe 422 is injected into the sample chamber 32. Under the action of the nitrogen pressure, the same volume of water sample in the sample chamber 32 is squeezed from the sample chamber 32 into the sample retention chamber 22. Manually place the sample bottle 221 just below the connecting pipe leading to the sample retention chamber 22, and store the water sample squeezed out of the sample chamber 32 in the sample bottle 221 for use in laboratory testing of other indicators. After all the nitrogen in the syringe 422 is transferred to the sample chamber 32, close the electric screw 421, and close the third solenoid valve 324 and the fourth solenoid valve 325. (5) The water sample in the sample chamber is left to stand, and the methane and carbon dioxide in the remaining water sample in the sample chamber 32 enter the upper gas through molecular motion until the methane and carbon dioxide in the remaining water sample and the upper gas reach equilibrium. At the same time, the temperature displayed by the thermometer 327 is recorded; (6) After the water-gas balance in the sample chamber 32 is reached, the flow path of the four-way solenoid valve 427 is adjusted by the control button area 332 to open the communication channel between the water storage chamber 41 and the syringe 422, and the electric screw 421 is started. The electric screw 421 drives the push rod of the syringe 422 to move upward, and the water sample with the same volume as the nitrogen in the water storage chamber 41 enters the inner cavity of the syringe 422, and the electric screw 421 is closed; (7) The flow path of the four-way solenoid valve 427 is adjusted by the control button area 332 to open the communication channel between the sample chamber 32 and the syringe 422, open the third solenoid valve 324 and the fifth solenoid valve 326, start the electric screw 421, and the electric screw 421 drives the push rod of the syringe 422 to move downward. The water sample in the inner cavity of the syringe 422 enters the sample chamber 32. The gas above the sample chamber 32 is transferred to the detection chamber 43 under the action of the water sample pressure. The electric screw 421 is closed, and the third solenoid valve 324 and the fifth solenoid valve 326 are closed. (8) The methane sensor 431 and the carbon dioxide sensor 432 in the detection chamber 43 detect the methane and carbon dioxide in the gas and transmit the detection information to the controller 441. After the controller 441 receives and processes the detection information, it is displayed on the display screen 333. The detection personnel obtain the methane and carbon dioxide content in the seawater by viewing the information displayed on the display screen 333, thereby realizing the in-situ detection of the methane and carbon dioxide content in the seawater.

[0041] If the present invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integrated molding using a casting process) (except where it is obviously impossible to use an integrated molding process).

[0042] In addition, unless otherwise stated, the terms used in any technical solution disclosed in the present invention to express positional relationships or shapes include states or shapes that are approximate, similar, or close thereto.

[0043] Any component provided by the present invention may be assembled from multiple separate components, or may be a separate component manufactured by an integral molding process.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions claimed for protection by the present invention.

Claims

1. An in-situ detection device for seawater methane and carbon dioxide, characterized by: The invention comprises a detection box, a water pump arranged in the detection box, a sample retention chamber, a sample bin, a nitrogen tank, a water storage chamber, an electric module, a detection chamber and a control module. The water inlet of the water pump is connected to a water pumping pipe for extending into seawater, the water outlet of the water pump is connected to the water inlet end of the sample bin, the sample output end of the sample bin is connected to the sample retention chamber, the exhaust end of the sample bin is connected to the detection chamber, and a methane sensor and a carbon dioxide sensor electrically connected to the control module are provided in the detection chamber; the electric module is used to transport the water sample in the water storage chamber and the nitrogen in the nitrogen tank to the sample bin.

2. The in-situ detection device for seawater methane and carbon dioxide according to claim 1, characterized in that: The interior of the detection box is provided with a first support plate, a second support plate and a third support plate from bottom to top, and the sample retention room and the water pump are both provided on the first support plate and distributed on the left and right; the sample bin and the nitrogen tank are both provided on the second support plate, the nitrogen tank is located on the right side of the sample bin, and a terminal box is provided on the left side of the sample bin; the control module, the detection chamber, the electric module and the water storage chamber are provided on the third support plate from left to right.

3. The in-situ detection device for seawater methane and carbon dioxide according to claim 1, characterized in that: A first solenoid valve is installed on the water suction pipe; the sample chamber is connected to a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe, the first connecting pipe is connected to the water outlet of the water pump, and the first connecting pipe is provided with a second solenoid valve; the second connecting pipe is connected to the sample retention chamber, and the second connecting pipe is provided with a fourth solenoid valve; the third connecting pipe is connected to the detection chamber, and the third connecting pipe is provided with a fifth solenoid valve, the fourth connecting pipe is connected to the electric module, and the fourth connecting pipe is provided with a third solenoid valve.

4. The in-situ detection device for seawater methane and carbon dioxide according to claim 3, characterized in that: The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve and the four-way solenoid valve are all electrically connected to the control module.

5. The in-situ detection device for seawater methane and carbon dioxide according to claim 1, characterized in that: A liquid level sensor and a thermometer are provided in the sample chamber, and both the liquid level sensor and the thermometer are electrically connected to the control module.

6. The in-situ detection device for seawater methane and carbon dioxide according to claim 1, characterized in that: The electric module includes a vertically arranged syringe, the push rod of the syringe is driven up and down by an electric screw arranged above, the output end of the syringe is connected to a four-way solenoid valve, the four-way solenoid valve is connected to the sample chamber, the nitrogen tank and the water storage chamber, and the four-way solenoid valve is electrically connected to the control module.

7. The in-situ detection device for seawater methane and carbon dioxide according to claim 1, characterized in that: A vacuum pump is provided on the left side of the detection chamber. The vacuum pump is connected to the detection chamber via a vacuum pipe. The vacuum pump is used to vacuum the detection chamber.

8. The in-situ detection device for seawater methane and carbon dioxide according to claim 2, characterized in that: The control module includes a protective box, in which a controller, a memory and a battery are installed. The controller is used to receive and process information transmitted by the methane sensor and the carbon dioxide sensor, the battery is used to power the controller, and the memory is used to store information of the controller; a partition is vertically installed in the terminal box, which separates the terminal box into a control area on the left and a display area on the right. The control area on the left is installed with control buttons, and the display area on the right is installed with a display screen. The control buttons and the display screen are both electrically connected to the controller.

9. The in-situ detection device for seawater methane and carbon dioxide according to claim 8, characterized in that: Sample bottles are provided in the sample retention room; universal wheels are installed at the four top corners of the bottom of the detection box; door openings are provided on the front sides of the sample retention room, terminal box, electric module and protective box, and protective doors for sealing the door openings are hinged in the door openings. A ventilation hole is opened on the protective door of the protective box, and a dustproof net is installed in the ventilation hole.

10. A method for in-situ detection of methane and carbon dioxide in seawater, characterized by: The device comprises an in-situ detection device for methane and carbon dioxide in seawater according to any one of claims 1 to 9, wherein during detection: the first solenoid valve and the second solenoid valve are opened to pump seawater into the sample chamber, and after the liquid level sensor detects that the sample chamber is full of water, the first solenoid valve and the second solenoid valve are closed; the nitrogen switch of the nitrogen tank is opened, the four-way solenoid valve of the electric module is switched to open only the nitrogen channel connected to the nitrogen tank, the motor switch of the electric screw is turned on, the electric screw drives the push rod of the syringe to move upward, at which time an appropriate amount of nitrogen enters the syringe cavity, and the nitrogen switch of the nitrogen tank is closed; the four-way solenoid valve is switched to the channel connected to the sample chamber, the third solenoid valve and the fourth solenoid valve are opened, and the push rod of the injection cavity moves downward under the drive of the electric screw motor, and the syringe cavity is filled with nitrogen. The nitrogen in the body is injected into the sample chamber, and the water sample of the same volume is transferred from the sample chamber to the sample bottle in the sample retention chamber, and the third solenoid valve and the fourth solenoid valve are closed; the water sample in the sample chamber is allowed to stand, and after the water-gas equilibrium in the sample chamber is reached, the four-way solenoid valve is switched to the channel connected to the water storage chamber, and the electric screw drives the push rod of the syringe to move upward, and the water sample of the same volume as the above-mentioned nitrogen in the water storage chamber enters the injection chamber of the syringe cavity; the four-way solenoid valve is switched to the channel connected to the sample chamber again, and the third solenoid valve and the fifth solenoid valve are opened at the same time. The push rod of the syringe moves downward under the drive of the electric screw, and the water sample in the syringe cavity of the syringe cavity is injected into the sample chamber driven by the motor. The gas above the sample chamber is squeezed into the detection box chamber, and the third solenoid valve and the fifth solenoid valve are closed; The methane sensor and carbon dioxide sensor detect the methane and carbon dioxide content entering the detection chamber. The methane sensor and carbon dioxide sensor transmit the detected data information to the controller. After the controller processes the data, it displays it on the display screen, thereby realizing the in-situ detection of methane and carbon dioxide in seawater at the same time.

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