Hydrogen solubility and multi-component gas competitive dissolution measuring device and method

Abstract

The invention relates to the technical field of gas solubility measurement, in particular to a hydrogen solubility and multi-component gas competitive dissolution measurement device and method, which are used for solving the problem of experimental result errors caused by water vapor generated by formation water in a dissolution cylinder due to temperature change. The device comprises a dissolved gas mechanism, the dissolved gas mechanism comprises a heat preservation box, and a first piston plate and a second piston plate are slidably connected into a dissolving cylinder and a gas cylinder respectively; the middle of the first piston plate is connected with an air conveying pipe which can communicate with the upper space and the lower space of the first piston plate. According to the device, partial pressure generated when formation water is converted into water vapor under different temperature conditions can be determined, the preset partial pressure of hydrogen is dynamically adjusted and maintained through the second piston plate, errors caused by formation water volume changes are eliminated, gas and formation water are isolated through the first piston plate, and formation water backflow during gas replacement and vacuumizing is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of gas solubility measurement, and in particular to a device and method for measuring hydrogen solubility and multi-component gas competitive dissolution. Background Art

[0002] Formation water is widely distributed in geological bodies. As the most important type of fluid at the basin scale, formation water is the carrier of various gas components. Affected by geological tectonic action and deep hydrothermal fluid transformation, changes in temperature and pressure conditions cause the solubility of gas components in formation water to change accordingly. Quantitative evaluation of the dissolution / analysis characteristics of hydrogen in formation water not only helps to deeply understand the large-scale migration and accumulation of natural hydrogen in geological bodies, but also has important significance for geological hydrogen storage technology.

[0003] During its migration, formation water may come into contact with other gases, such as methane, nitrogen, carbon dioxide, etc. These gases may compete with hydrogen for dissolution in formation water, that is, they will compete for dissolution space in formation water, thus affecting the dissolution and decomposition characteristics of hydrogen. Therefore, in order to accurately evaluate the dissolution and decomposition behavior of hydrogen in formation water, competitive dissolution tests are required.

[0004] The main purpose of the competitive dissolution test is to understand how much hydrogen will be desorbed after the formation water containing dissolved hydrogen comes into contact with other gases, so as to evaluate the feasibility and efficiency of formation hydrogen storage. Drawing on the experimental idea of ​​gas adsorption by solid materials, the gas solubility measurement system usually directly introduces the gas into the water and converts the gas solubility by monitoring the pressure change in the constant volume reactor. However, this method may have the following defects: (1) Unlike solid materials, as the temperature increases, on the one hand, the formation water will be converted into water vapor, affecting the pressure of the reactor; on the other hand, the formation water will expand, causing the gas phase to occupy a smaller volume in the reaction vessel, thereby causing errors in the experimental results; (2) Because the gas and formation water cannot be effectively isolated, vacuuming will cause the formation water to flow back, and it is impossible to simulate the competitive dissolution experiment of multi-component gas. Summary of the invention

[0005] The present invention provides a device for measuring the solubility of hydrogen in formation water and the solubility of gas under competitive dissolution of multiple components of gas. The device has the advantages of clarifying the partial pressure generated by the conversion of formation water into water vapor under different temperature conditions, ensuring that a preset partial pressure of hydrogen is reached in a reaction container through dynamic adjustment of a piston plate, and accurately measuring the solubility of hydrogen, thereby solving the problem of experimental result errors caused by the influence of temperature when gas dissolves in formation water. At the same time, a piston plate connected to a gas transmission tube is added to the dissolution cylinder to isolate the gas and formation water, thereby solving the problem of formation water backflow caused by the inability to effectively isolate the gas and formation water during vacuum extraction.

[0006] In order to alleviate the above technical problems, the technical solution provided by the present invention is: A hydrogen solubility and multi-component gas competitive dissolution measuring device, comprising a dissolved gas mechanism, the dissolved gas mechanism comprising an insulated box, two dissolved cylinders and a gas cylinder are arranged in the insulated box, one of the dissolved cylinders is connected to the gas cylinder through a pipeline, a first piston plate is slidably connected in both of the two dissolved cylinders, and a second piston plate is slidably connected in the gas cylinder; The gas cylinder is connected with the upper space of the first piston plate in the two dissolving cylinders through two pipes respectively. The upper space and lower space of the first piston plate in the two dissolving cylinders are connected with each other through pipes respectively. The upper pipe is used to transmit gas, and the lower pipe is used to transmit liquid. The middle part of the first piston plate is connected with an air transfer pipe, and the air transfer pipe can connect the upper and lower spaces of the first piston plate.

[0007] Furthermore, it also includes a gas injection mechanism, the gas injection mechanism includes a hydrogen tank and a methane tank, the hydrogen tank and the methane tank are respectively connected to the same booster pump through pipelines, and the booster pump is connected to the gas cylinder through a pipeline; After desorbing the hydrogen from the water, the gas cylinder and the dissolution cylinder are evacuated to remove the hydrogen, and then high purity methane is injected into the gas cylinder and the dissolution cylinder.

[0008] Furthermore, it also includes a parsing mechanism, the parsing mechanism includes a thermal parsing device, the thermal parsing device is connected to the dissolving tank through a pipeline, and a valve is provided on the pipeline connecting the thermal parsing device and the dissolving tank; The analysis mechanism further includes a gas collecting tank, which is connected to the thermal analysis device through a pipeline, and a high-precision balance is arranged at the lower part of the gas collecting tank, and a pressure gauge is arranged on the gas collecting tank.

[0009] Furthermore, the analysis mechanism also includes a quadrupole mass spectrometer, and the quadrupole mass spectrometer is connected to the gas collection tank through a pipeline.

[0010] Furthermore, it also includes a control mechanism, which includes a threaded barrel connected to the lower surface of the second piston plate, a threaded rod with an axially fixed position is threadedly connected to the threaded barrel, and the threaded barrel is key-slidingly connected to the gas cylinder. When the threaded rod rotates, the second piston plate can slide vertically in the gas cylinder.

[0011] Furthermore, the control mechanism also includes a motor, the output end of the motor is connected to a first magnet, the bottom end of the threaded rod is connected to a second magnet, the first magnet is magnetically coupled to the second magnet, when the gas pressure in the gas cylinder is lower than 1kPa, the first magnet can drive the second magnet to rotate synchronously, and when the gas pressure in the gas cylinder is higher than 1kPa, the first magnet can rotate relative to the second magnet, thereby maintaining the gas pressure in the gas cylinder at 1kPa.

[0012] Furthermore, the control mechanism further comprises a vent hole, the vent hole is opened on the side wall of the air transmission tube at the lower part of the first piston plate, the bottom end of the air transmission tube is connected to a fixing seat, the fixing seat is rotatably connected to a cylinder, and the inner wall of the cylinder is in contact with the outer wall of the air transmission tube; A through groove is provided on the side wall of the cylinder. When the gas pressure in the gas cylinder is not less than 1 kPa, the cylinder can rotate relative to the gas transmission tube so that the vent hole is connected with the through groove.

[0013] Furthermore, the control mechanism also includes an arc-shaped cylinder, the cylinder body of the arc-shaped cylinder is connected to the fixed seat, the cylinder rod of the arc-shaped cylinder is connected to the cylinder, and the arc-shaped cylinder can drive the cylinder to rotate relative to the air transmission tube when it is extended or retracted.

[0014] Furthermore, the control mechanism also includes two mutually meshing first gears and two mutually meshing second gears, wherein one of the first gear and the second gear is fixedly connected to the second magnet and the first magnet respectively, and the upper part of the other first gear is connected to a piston cylinder, an air guide pipe is connected between the piston cylinder and the arc cylinder, a circular plate is slidably connected in the piston cylinder, a screw is connected to the lower surface of the circular plate, the screw is threadedly connected to the first gear, and a limiting rod is connected to the bottom end of the screw, and the limiting rod is axially key-slidably connected to the second gear just below the piston cylinder; When the gas pressure in the gas cylinder is lower than 1kPa, the first gear and the second gear rotate synchronously, so that the screw does not rotate relative to the first gear. At this time, the circular plate does not move up relative to the piston cylinder. When the gas pressure in the gas cylinder is higher than 1kPa, the second gear rotates relative to the first gear, so that the screw rotates relative to the first gear to make the circular plate move up relative to the piston cylinder, thereby extending the arc cylinder.

[0015] A method for measuring hydrogen solubility and multi-component gas competitive dissolution, the method being applied to a hydrogen solubility and multi-component gas competitive dissolution measuring device, comprising the following steps: S1, evacuate the gas cylinder and one of the dissolving cylinders, close the valve of the pipeline for transmitting the liquid, and after the dissolving cylinder is evacuated, set the incubator to the test temperature, open the connecting valve on the pipeline connecting one of the dissolving cylinders and the gas cylinder, inject hydrogen into the gas cylinder, and stop injecting when the injection pressure of the hydrogen reaches a preset pressure; S2. Control the gas transmission tube to open so that hydrogen is dissolved in water. When hydrogen is dissolved in water and the volume of water changes, the first piston plate is lifted by the water with the changed volume and moves upward relative to the dissolution cylinder. When the first piston plate moves upward, the second piston plate moves downward by an equal distance in the gas cylinder, thereby maintaining a preset pressure of hydrogen. S3, analyzing the water containing dissolved hydrogen to obtain the amount of analyzed hydrogen; S4, after repeating step S1 and step S2, evacuate the gas cylinder and the other dissolving cylinder, close the connecting valve opened in step S1, open the connecting valve on the pipeline connecting the other dissolving cylinder and the gas cylinder, open the pipeline valve for transmitting liquid, transfer the water dissolved with hydrogen to the other dissolving cylinder through the pipeline, close the pipeline valve for transmitting liquid, inject competitive gas into the gas cylinder, and stop injecting competitive gas when the injection pressure reaches a preset pressure; S5, repeating step S2, so that the second piston plate moves downward by the same amount as the first piston plate; S6. Analyze the water in which the hydrogen and competitive gas are dissolved, collect and record the total amount of the analyzed mixed gas, inject the collected mixed gas into a gas chromatography-mass spectrometer to determine the percentage of different gas components, calculate the amount of hydrogen and competitive gas after analysis, compare the analyzed amount of hydrogen in step S3, and obtain the dissolved amount of hydrogen and methane in the formation water after competitive dissolution of the multi-component gases.

[0016] The beneficial effects of the present invention are analyzed as follows: A device for measuring hydrogen solubility and competitive dissolution of multi-component gases comprises a dissolved gas mechanism, wherein the dissolved gas mechanism comprises an insulated box, wherein a dissolving cylinder and a gas cylinder which are interconnected through a pipeline are arranged in the insulated box, wherein a first piston plate and a second piston plate are slidably connected in the dissolving cylinder and the gas cylinder respectively; the dissolving cylinder is filled with water at the lower part of the first piston plate, and a gas transmission pipe is connected to the middle part of the first piston plate, and the gas transmission pipe can connect the upper and lower spaces of the first piston plate; a connecting valve on the pipeline connecting the dissolving cylinder and the gas cylinder is opened, hydrogen is injected into the gas cylinder, the position of the second piston plate is adjusted so that the gas cylinder reaches a desired pressure value, the gas transmission pipe is controlled to open so that hydrogen is dissolved in water, the first piston plate is controlled to move downward to discharge water after the hydrogen is dissolved, the water is analyzed, and the volume of hydrogen after the analysis is collected and calculated.

[0017] By evacuating the dissolution cylinder and placing it in different temperature environments, the partial pressure generated by the conversion of formation water into water vapor under different temperature conditions can be clearly determined, and the preset partial pressure of hydrogen is maintained through dynamic adjustment by the second piston plate to eliminate the error caused by the volume change of formation water. The gas and formation water are isolated by the first piston plate to prevent the backflow of formation water when the gas is replaced and the vacuum is extracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the heat preservation box of the present invention; Figure 3 It is a structural schematic diagram of the threaded barrel of the present invention; Figure 4 is a cross-sectional view of the piston cylinder of the present invention; Figure 5 It is a structural schematic diagram of the air transmission pipe of the present invention; Figure 6 It is a schematic structural diagram of the cylinder of the present invention.

[0020] icon: 100, gas injection mechanism; 110, hydrogen tank; 120, methane tank; 130, booster pump; 200, dissolved gas mechanism; 210, heat preservation box; 220, gas cylinder; 230, dissolved cylinder; 300, control mechanism; 310, second piston plate; 311, threaded cylinder; 312, threaded rod; 313, second magnet; 314, motor; 315, first magnet; 320, first piston plate; 321, electric telescopic rod; 3 22. air transfer tube; 3221. air vent; 323. cylinder; 3231. through groove; 324. arc cylinder; 325. air guide tube; 330. first gear; 340. second gear; 350. round plate; 360. screw rod; 370. limit rod; 380. piston cylinder; 381. limit pin; 382. spring; 400. analysis mechanism; 410. thermal analysis device; 420. gas collection tank; 430. mass spectrometer. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Embodiment 1, as Figure 1-Figure 6 As shown, a hydrogen solubility and multi-component gas competitive dissolution measuring device includes a dissolved gas mechanism 200, and the dissolved gas mechanism 200 includes an insulated box 210, in which two dissolving cylinders 230 and a gas cylinder 220 are arranged, one of the dissolving cylinders 230 is connected to the gas cylinder 220 through a pipeline, and the first piston plate 320 is slidably connected in the two dissolving cylinders 230, and the second piston plate 310 is slidably connected in the gas cylinder 220; the gas cylinder 220 is connected to the upper space of the first piston plate 320 in the two dissolving cylinders 230 through two pipelines, and the upper space and the lower space in the first piston plate 320 in the two dissolving cylinders 230 are connected to each other through pipelines, the upper pipeline is used to transmit gas, and the lower pipeline is used to transmit liquid, and the middle of the first piston plate 320 is connected to an air transfer pipe 322, and the air transfer pipe 322 can connect the upper and lower spaces of the first piston plate 320.

[0025] The working mechanism of the hydrogen solubility and multi-component gas competitive dissolution measurement device and method provided in this embodiment is as follows: The dissolving cylinder 230 and the gas cylinder 220 are both provided with pressure gauges. When in use, water is injected into the dissolving cylinder 230. A liquid level sensor is provided in the dissolving cylinder 230. The height of the water in the dissolving cylinder 230 is sensed and recorded by the liquid level sensor, which is recorded as H0. Then, the water is vacuumized to discharge the dissolved gas in the water. The dissolving cylinder 230 and the gas cylinder 220 are both provided in the heat preservation box 210. The heat preservation box 210 is adjusted to a temperature T. After standing, the pressure generated by the evaporation of water in the dissolving cylinder 230 when the temperature is T is recorded. Then, the valve of the pipeline between the dissolving cylinder 230 and the gas cylinder 220 is opened, and high-purity hydrogen is injected into the gas cylinder 220 to make the pressure in the gas cylinder 220 reach P0, where P0 is the injection pressure of hydrogen. When hydrogen is dissolved in water, the air pressure in the gas cylinder 220 and the dissolving cylinder 230 decreases, and the volume of water increases due to the dissolution of hydrogen in water, so that the first piston The plate 320 moves upward, and after the liquid level sensor detects the upward movement distance of the first piston plate 320, the second piston plate 310 moves downward by the same distance, so that the injection partial pressure of hydrogen is not affected by the expansion of the formation water. After the gas pressure in the dissolving cylinder 230 is stabilized, it means that the hydrogen can no longer be dissolved in the water in the dissolving cylinder 230, and the water solubility in the dissolving cylinder 230 has reached saturation. At this time, the water level in the dissolving cylinder 230 is recorded as H1, and the expansion coefficient of water at this temperature and pressure is recorded as V (H1) - V (H0) / the amount of dissolved hydrogen. The first piston plate 320 is controlled to move downward to discharge the water after the dissolved hydrogen, and then the water level in the dissolving cylinder 230 is recorded as H2, and the formation water with dissolved gas is analyzed, and the analyzed gas is collected. The volume of the gas is determined by recording the weight of the gas under standard conditions. If the gas volume is calculated by a pressure gauge, the amount of gas substance is calculated by the ideal state equation; The above process measures the solubility of hydrogen. When measuring the competitive solubility of the gas, the water dissolved in hydrogen in one of the dissolving cylinders 230 is extracted through a pipeline to another dissolving cylinder 230, so that the water dissolved in hydrogen is completely transferred to the other dissolving cylinder 230 that has been evacuated in advance to ensure the accuracy of the experiment. After the water dissolved in hydrogen is completely transferred to the other dissolving cylinder 230, the gas cylinder 220 is evacuated again to discharge the hydrogen in the gas cylinder 220, and then methane is injected into the gas cylinder 220. The above operation is repeated so that methane can be dissolved in water, and the hydrogen precipitated due to the dissolution of methane remains in the dissolving cylinder 230. After the gas pressure stabilizes again, water equal to the amount of the analyzed hydrogen is extracted, and the water is analyzed again to obtain the amount of hydrogen and methane after analysis, thereby obtaining the solubility of the experimental gas. Set the temperature, pressure, salinity and other conditions, repeat the above steps, the expansion coefficient of formation water changes with temperature, pressure, salinity and alkalinity, and the solubility of hydrogen is tested under these changing conditions; It should be noted here that the experimental gas includes but is not limited to hydrogen and methane, and the competitive gas component can be methane, or nitrogen, carbon dioxide and other gases existing in the formation.

[0026] Regarding the structure of the gas injection mechanism 100, specifically: The gas injection mechanism 100 includes a hydrogen tank 110 and a methane tank 120, which are respectively connected to the same booster pump 130 through pipelines, and the booster pump 130 is connected to the gas cylinder 220 through a pipeline; after the hydrogen in the water is analyzed, the gas cylinder 220 and the dissolution cylinder 230 are evacuated to remove the hydrogen, and then high-purity methane is injected into the gas cylinder 220 and the dissolution cylinder 230.

[0027] When measuring the solubility of hydrogen, the booster pump 130 draws hydrogen from the hydrogen tank 110 and injects it into the gas cylinder 220. After the solubility measurement of hydrogen is completed, the hydrogen in the gas cylinder 220 and the dissolution cylinder 230 is removed by vacuuming, but the water dissolved in the hydrogen is not vacuumed. Subsequently, methane is pumped into the gas cylinder 220 by the booster pump 130 and the above steps of measuring the solubility of hydrogen are repeated. At this time, methane can be dissolved in the water previously dissolved in hydrogen under the action of pressure, thereby simulating competitive adsorption of gas. It should be noted here that two dissolution cylinders 230 are provided, and the formation water after dissolving hydrogen is transferred from one of the dissolution cylinders 230 to the other dissolution cylinder 230, and the transferred dissolution cylinder 230 is subsequently vacuumed.

[0028] Specifically, the structure of the analysis mechanism 400 is as follows: The analysis mechanism 400 includes a thermal analysis device 410 . The thermal analysis device 410 is connected to the dissolution tank 230 through a pipeline, and a valve is provided on the pipeline connecting the thermal analysis device 410 and the dissolution tank 230 .

[0029] The gas-dissolving water discharged from the dissolution tank 230 enters the thermal desorption device 410, and the gas-dissolving water is heated to decompose the gas in the gas-dissolving water, and the decomposed gas is collected, and the weight or volume of the gas is recorded; The analysis mechanism 400 may also use a device for applying negative pressure to precipitate gas in the water. To ensure that the gas is fully precipitated, an ultrasonic oscillator may also be used to vibrate the analysis mechanism 400.

[0030] Among the optional methods of this embodiment, the more preferred ones are: The analysis mechanism 400 further includes a gas collecting tank 420 . The gas collecting tank 420 is connected to the thermal analysis device 410 through a pipeline. A pressure gauge is provided on the gas collecting tank 420 .

[0031] The gas collection tank 420 is connected to the thermal analysis device 410 through a pipeline. The analyzed gas is collected by the gas collection tank 420. The pressure change before and after the gas collection tank 420 is detected by a pressure gauge. The volume of the gas is calculated by the pressure change. The calculation formula is: ΔV∝(1 / P2-1 / P1); Among them, ΔV represents the volume change; P1 is the initial pressure; and P2 is the pressure after the change.

[0032] Among the optional methods of this embodiment, the more preferred ones are: The analysis mechanism 400 further includes a quadrupole mass spectrometer 430 , which is connected to the gas collection tank 420 via a pipeline.

[0033] The second piston plate 310 is moved downward to squeeze the formation water containing the dissolved mixed gas into the thermal analysis device 410 for gas analysis, and the weight of the gas or the volume of the gas under standard conditions is recorded. The collected gas is measured by a quadrupole mass spectrometer 430 to determine the desolvation efficiency of hydrogen under different partial pressure conditions. Under the conditions of temperature, pressure and associated gas components, the desolvation efficiency of hydrogen is the solubility of hydrogen minus the solubility of the hydrogen mixed gas.

[0034] Regarding the structure of the control mechanism 300, specifically: The control mechanism 300 includes a threaded barrel 311 connected to the lower surface of the second piston plate 310, and a threaded rod 312 with an axially fixed position is threadedly connected to the threaded barrel 311. The threaded barrel 311 is slidably connected to the gas cylinder 220. When the threaded rod 312 rotates, the second piston plate 310 can slide vertically in the gas cylinder 220.

[0035] The threaded rod 312 does not move in the axial position, so when the threaded rod 312 rotates relative to the threaded barrel 311, the threaded barrel 311 can slide axially. The threaded barrel 311 and the gas cylinder 220 are key-slidingly connected to ensure that the threaded barrel 311 does not rotate relative to the gas cylinder 220, so that when the threaded barrel 311 moves, it can drive the second piston plate 310 to slide in the gas cylinder 220, so that the pressure in the gas cylinder 220 is controlled, and an electric telescopic rod 321 is connected between the first piston plate 320 and the top wall of the dissolution cylinder 230. The first piston plate 320 is moved up and down by controlling the extension and retraction of the electric telescopic rod 321, and the electric telescopic rod 321 can be freely extended and retracted when not started, so that the volume change after the gas dissolved in the water can make the first piston plate 320 passively move.

[0036] Among the optional methods of this embodiment, the more preferred ones are: The control mechanism 300 also includes a motor 314, the output end of the motor 314 is connected to a first magnet 315, the bottom end of the threaded rod 312 is connected to a second magnet 313, the first magnet 315 is magnetically coupled to the second magnet 313, when the air pressure in the gas cylinder 220 is lower than 1 kPa, the first magnet 315 can drive the second magnet 313 to rotate synchronously, and when the air pressure in the gas cylinder 220 is higher than 1 kPa, the first magnet 315 can rotate relative to the second magnet 313, thereby maintaining the air pressure in the gas cylinder 220 at 1 kPa.

[0037] When the gas pressure of the gas cylinder 220 and the dissolving cylinder 230 is maintained, the motor 314 is started to drive the second magnet 313 to rotate through the magnetic coupling between the first magnet 315 and the second magnet 313, so that the threaded rod 312 connected to the second magnet 313 rotates, and the threaded rod 312 drives the second piston plate 310 to move upward. When the gas pressure in the gas cylinder 220 is higher than 1kPa, the action of the gas pressure and the friction between the threaded rod 312, the threaded barrel 311 and the gas cylinder 220 hinders the rotation of the second magnet 313, so that the first magnet 315 rotates relative to the second magnet 313, thereby maintaining the gas pressure in the gas cylinder 220. If it is to be ensured that the second piston plate 310 can move the same amount as the first piston plate 320, the amount of current flowing through the two magnets is adjusted so that the coupling force of the two magnets increases, thereby ensuring that the motor 314 can drive the second piston plate 310 to move. At this time, the operation of the motor 314 depends on the control system receiving and converting the measured value of the liquid level sensor and then issuing an instruction to run, thereby dynamically adjusting the position of the second piston plate 310, so that the influence of the pressure change caused by the expansion of water is reduced, and the effect of maintaining the preset partial pressure of hydrogen is achieved. In addition, the displacement of the second piston plate 310 can also be synchronized according to the movement of the first piston plate 320 and the change of air pressure. The data obtained by the water level sensor and the pressure value of the dissolution cylinder 230 are transmitted to the control system together. The control system adaptively controls the movement of the second piston plate 310 while maintaining the hydrogen pressure in the dissolution cylinder 230.

[0038] Among the optional methods of this embodiment, the more preferred ones are: The control mechanism 300 also includes a vent hole 3221, which is provided on the side wall of the air pipe 322 at the lower part of the first piston plate 320. The bottom end of the air pipe 322 is connected to a fixed seat, and a cylinder 323 is rotatably connected to the fixed seat. The inner wall of the cylinder 323 fits the outer wall of the air pipe 322. A through groove 3231 is provided on the side wall of the cylinder 323. When the gas pressure in the gas cylinder 220 is not lower than 1 kPa, the cylinder 323 can rotate relative to the air pipe 322 to connect the vent hole 3221 with the through groove 3231.

[0039] When the gas pressure in the gas cylinder 220 and the dissolution cylinder 230 is 1 kPa, the vent 3221 on the gas transfer tube 322 connects the upper and lower spaces of the dissolution cylinder 230, so that hydrogen can dissolve in the water under the first piston plate 320. Conversely, when the gas pressure in the gas cylinder 220 and the dissolution cylinder 230 drops to below 1 kPa, the vent 3221 is closed, thereby preventing the hydrogen dissolved in the water from being decomposed due to low pressure.

[0040] Among the optional methods of this embodiment, the more preferred ones are: The control mechanism 300 further includes an arc-shaped cylinder 324 , the cylinder body of the arc-shaped cylinder 324 is connected to a fixed seat, and the cylinder rod of the arc-shaped cylinder 324 is connected to the cylinder 323 . When the arc-shaped cylinder 324 is extended or retracted, it can drive the cylinder 323 to rotate relative to the air transmission tube 322 .

[0041] When the arc cylinder 324 is extended, it can push the cylinder 323 to rotate relative to the air transfer tube 322, so that the through groove 3231 is connected with the air hole 3221, thereby connecting the upper and lower spaces of the first piston plate 320. When the arc cylinder 324 is shortened, the through groove 3231 and the air hole 3221 are no longer connected, thereby isolating the upper and lower spaces of the first piston plate 320.

[0042] Among the optional methods of this embodiment, the more preferred ones are: The control mechanism 300 also includes two mutually meshing first gears 330 and two mutually meshing second gears 340, wherein one of the first gears 330 and the second gear 340 are fixedly connected to the second magnet 313 and the first magnet 315 respectively, and the upper part of the other first gear 330 is connected to a piston cylinder 380, and an air guide pipe 325 is connected between the piston cylinder 380 and the arc cylinder 324, and a circular plate 350 is slidably connected in the piston cylinder 380, and a screw 360 is connected to the lower surface of the circular plate 350, and the screw 360 is threadedly connected to the first gear 330, and the bottom end of the screw 360 is connected to a limit rod 370, the limit rod 370 is axially key-slidably connected to the second gear 340 at the lower part of the piston cylinder 380; when the air pressure in the gas cylinder 220 is lower than 1kPa, the first gear 330 and the second gear 340 rotate synchronously, so that the screw 360 does not rotate relative to the first gear 330, and the circular plate 350 does not move up relative to the piston cylinder 380 at this time; and, when the air pressure in the gas cylinder 220 is higher than 1kPa, the second gear 340 rotates relative to the first gear 330, so that the screw 360 rotates relative to the first gear 330 to make the circular plate 350 move up relative to the piston cylinder 380, so that the arc cylinder 324 extends.

[0043] When the air pressure inside the gas cylinder 220 is lower than 1 kPa, the first magnet 315 can drive the second magnet 313 to rotate synchronously, so that the first gear 330 and the second gear 340 rotate synchronously, and the other first gear 330 and the second gear 340 mesh with these two first gears 330 and the second gear 340, so that the other two first gears 330 and the second gear 340 rotate synchronously. At this time, there is no relative rotation between the screw 360 and the corresponding first gear 330, so that the screw 360 does not slide axially relative to the first gear 330, and the circular plate 350 does not slide in the piston cylinder 380 at this time, and the air in the piston cylinder 380 does not enter the arc cylinder 324. In this state, the air pressure in the gas cylinder 220 and the dissolving cylinder 230 is lower than 1 kPa, and when the air pressure is higher than 1 kPa, the first magnet 315 rotates relative to the second magnet 313, so that the first gear 330 and the second gear The wheels 340 rotate relative to each other. At this time, the limit rod 370 that slides on the other second gear 340 rotates relative to the other first gear 330, so that the screw 360 connected to the limit rod 370 rotates relative to the first gear 330 connected thereto, and then the circular plate 350 slides up in the piston cylinder 380, so that the air in the piston cylinder 380 enters the arc cylinder 324. At this time, the arc cylinder 324 extends. After the arc cylinder 324 extends, the operation of the motor 314 is stopped. A pressure relief valve is also provided on the air guide pipe 325 connecting the piston cylinder 380 and the arc cylinder 324. An air pressure sensor is provided in the gas cylinder 220. When the air pressure sensor detects that the pressure is lower than 1kPa, the pressure relief valve opens, so that the arc cylinder 324 shortens and the pressure relief valve closes again. At the same time, according to the value of the air pressure sensor, the motor 314 starts again to pressurize the gas cylinder 220 and the dissolving cylinder 230, and the above actions are repeated. The two dissolving cylinders 230 are both provided with control mechanisms 300. The air guide pipes 325 of the two control mechanisms 300 are both connected to the piston cylinder 380. Valves are provided on the two air guide pipes 325. The opening and closing states of the two valves are adjusted according to the use states of the two dissolving cylinders 230. With the relative axial movement of the screw rod 360 and the piston cylinder 380, the circular plate 350 can move up to the top wall of the piston cylinder 380. At this time, the continued movement of the circular plate 350 will cause the limit pin 381 connected to the piston cylinder 380 to slide up relative to the second gear 340 and compress the spring 382. A pressure-sensitive switch for controlling the motor 314 to shut down is set on the top of the piston cylinder 380. When the upward piston cylinder 380 hits the pressure-sensitive switch, the motor 314 stops running, thereby preventing the device from being seriously damaged.

[0044] Example 2 On the basis of Example 1, a method for measuring hydrogen solubility and multi-component gas competitive dissolution is applied to a hydrogen solubility and multi-component gas competitive dissolution measuring device, comprising the following steps: S1, evacuate the gas cylinder 220 and one of the dissolving cylinders 230, close the valve of the pipeline for transmitting the liquid, and after the dissolving cylinder 230 is evacuated, set the incubator 210 to the test temperature, open the connecting valve on the pipeline connecting one of the dissolving cylinders 230 and the gas cylinder 220, inject hydrogen into the gas cylinder 220, and stop injecting when the injection pressure of the hydrogen reaches the preset pressure; S2. Control the gas transmission tube 322 to open, so that hydrogen is dissolved in water. When hydrogen is dissolved in water and the volume of water changes, the first piston plate 320 is lifted by the water with the changed volume and moves upward relative to the dissolution cylinder 230. When the first piston plate 320 moves upward, the second piston plate 310 moves downward in the gas cylinder 220 by an equal amount, thereby maintaining the preset pressure of hydrogen. S3, analyzing the water containing dissolved hydrogen to obtain the amount of analyzed hydrogen; S4, after repeating step S1 and step S2, evacuate the gas cylinder 220 and the other dissolving cylinder 230, close the connecting valve opened in step S1, open the connecting valve on the pipeline connecting the other dissolving cylinder 230 and the gas cylinder 220, open the pipeline valve for transmitting liquid, transfer the water dissolved with hydrogen to the other dissolving cylinder 230 through the pipeline, then close the pipeline valve for transmitting liquid, inject competitive gas into the gas cylinder 220, and stop injecting the competitive gas when the injection pressure reaches the preset pressure; S5, repeat step S2, so that the second piston plate 310 moves downward by the same amount as the first piston plate 320; S6. Analyze the water containing dissolved hydrogen and competitive gases, collect and record the total amount of the analyzed mixed gas, inject the collected mixed gas into a gas chromatograph-mass spectrometer to determine the percentage of different gas components, calculate the amount of analyzed hydrogen and competitive gas, compare the analyzed amount of hydrogen in step S3, and obtain the dissolved amount of hydrogen and methane in the formation water after competitive dissolution of multi-component gases.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring hydrogen solubility and multi-component gas competitive dissolution, characterized by: The invention comprises a dissolving gas mechanism (200), wherein the dissolving gas mechanism (200) comprises a heat preservation box (210), wherein two dissolving cylinders (230) and a gas cylinder (220) are arranged in the heat preservation box (210), wherein one of the dissolving cylinders (230) is connected to the gas cylinder (220) via a pipeline, wherein a first piston plate (320) is slidably connected in both the dissolving cylinders (230), and wherein a second piston plate (310) is slidably connected in the gas cylinder (220); The gas cylinder (220) is connected to the upper space of the first piston plate (320) in the two dissolving cylinders (230) through two pipes. The upper space and the lower space of the first piston plate (320) in the two dissolving cylinders (230) are connected to each other through pipes. The upper pipe is used to transmit gas, and the lower pipe is used to transmit liquid. The middle of the first piston plate (320) is connected to an air transmission pipe (322), and the air transmission pipe (322) can connect the upper and lower spaces of the first piston plate (320).

2. The hydrogen solubility and multi-component gas competitive dissolution measuring device according to claim 1, characterized in that: The apparatus further comprises a gas injection mechanism (100), the gas injection mechanism (100) comprising a hydrogen tank (110) and a competitive gas tank (120), the hydrogen tank (110) and the competitive gas tank (120) being respectively connected to the same booster pump (130) via a pipeline, and the booster pump (130) being connected to the gas cylinder (220) via a pipeline; After decomposing the hydrogen from the water, the gas cylinder (220) and the dissolution cylinder (230) are evacuated to remove the hydrogen, and then a competitive gas is injected into the gas cylinder (220) and the dissolution cylinder (230).

3. The hydrogen solubility and multi-component gas competitive dissolution measuring device according to claim 2, characterized in that: The device further comprises a decomposition mechanism (400), wherein the decomposition mechanism (400) comprises a thermal decomposition device (410), wherein the thermal decomposition device (410) is connected to the dissolution tank (230) via a pipeline, and a valve is provided on the pipeline connecting the thermal decomposition device (410) and the dissolution tank (230); The analysis mechanism (400) further comprises a gas collection tank (420), wherein the gas collection tank (420) is connected to the thermal analysis device (410) via a pipeline, and a pressure gauge is provided on the gas collection tank (420).

4. The hydrogen solubility and multi-component gas competitive dissolution measuring device according to claim 3, characterized in that: The analysis mechanism (400) further includes a quadrupole mass spectrometer (430), and the quadrupole mass spectrometer (430) is connected to the gas collection tank (420) via a pipeline.

5. The hydrogen solubility and multi-component gas competitive dissolution measuring device according to claim 4, characterized in that: The invention also includes a control mechanism (300), wherein the control mechanism (300) includes a threaded barrel (311) connected to the lower surface of the second piston plate (310), wherein the threaded barrel (311) is internally threadedly connected to a threaded rod (312) fixed in an axial position, and the threaded barrel (311) is slidably connected to the gas cylinder (220), and when the threaded rod (312) rotates, the second piston plate (310) can slide vertically in the gas cylinder (220).

6. The hydrogen solubility and multi-component gas competitive dissolution measuring device according to claim 5, characterized in that: The control mechanism (300) further includes a motor (314), wherein the output end of the motor (314) is connected to a first magnet (315), and the bottom end of the threaded rod (312) is connected to a second magnet (313), wherein the first magnet (315) is magnetically coupled to the second magnet (313), and when the air pressure in the gas cylinder (220) is lower than 1 kPa, the first magnet (315) can drive the second magnet (313) to rotate synchronously, and when the air pressure in the gas cylinder (220) is higher than 1 kPa, the first magnet (315) can rotate relative to the second magnet (313), thereby maintaining the air pressure in the gas cylinder (220) at 1 kPa.

7. The device for measuring hydrogen solubility and multi-component gas competitive dissolution according to claim 6, characterized in that: The control mechanism (300) further comprises a vent hole (3221), the vent hole (3221) being formed on the side wall of the air transmission tube (322) at the lower portion of the first piston plate (320), the bottom end of the air transmission tube (322) being connected to a fixing seat, the fixing seat being rotatably connected to a cylinder (323), the inner wall of the cylinder (323) being in contact with the outer wall of the air transmission tube (322); A through groove (3231) is provided on the side wall of the cylinder (323). When the gas pressure in the gas cylinder (220) is not less than 1 kPa, the cylinder (323) can rotate relative to the gas transmission tube (322) so that the vent hole (3221) is connected to the through groove (3231).

8. The device for measuring hydrogen solubility and multi-component gas competitive dissolution according to claim 7, characterized in that: The control mechanism (300) further comprises an arc-shaped cylinder (324), wherein the cylinder body of the arc-shaped cylinder (324) is connected to the fixing seat, and the cylinder rod of the arc-shaped cylinder (324) is connected to the cylinder (323). When the arc-shaped cylinder (324) is extended or retracted, it can drive the cylinder (323) to rotate relative to the air transmission tube (322).

9. The hydrogen solubility and multi-component gas competitive dissolution measuring device according to claim 8, characterized in that: The control mechanism (300) further includes two mutually meshing first gears (330) and two mutually meshing second gears (340), wherein one of the first gears (330) and the second gear (340) are fixedly connected to the second magnet (313) and the first magnet (315), respectively; the upper portion of the other first gear (330) is connected to a piston cylinder (380); an air guide tube (325) is connected between the piston cylinder (380) and the arc cylinder (324); a circular plate (350) is slidably connected in the piston cylinder (380); a screw (360) is connected to the lower surface of the circular plate (350); the screw (360) is threadedly connected to the first gear (330); the bottom end of the screw (360) is connected to a limiting rod (370); the limiting rod (370) is axially key-slidably connected to the second gear (340) directly below the piston cylinder (380); When the air pressure in the gas cylinder (220) is lower than 1 kPa, the first gear (330) and the second gear (340) rotate synchronously, so that the screw (360) does not rotate relative to the first gear (330), and at this time the circular plate (350) does not move upward relative to the piston cylinder (380); and, when the air pressure in the gas cylinder (220) is higher than 1 kPa, the second gear (340) rotates relative to the first gear (330), so that the screw (360) rotates relative to the first gear (330) so that the circular plate (350) moves upward relative to the piston cylinder (380), thereby extending the arc cylinder (324).

10. A method for measuring hydrogen solubility and multi-component gas competitive dissolution, the method being applied to the hydrogen solubility and multi-component gas competitive dissolution measuring device according to claim 1, characterized in that: The following steps are involved: S1, evacuating the gas cylinder (220) and one of the dissolving cylinders (230), closing the valve of the pipeline for transmitting the liquid, and after the dissolving cylinder (230) is evacuated, setting the heat preservation box (210) to the test temperature, opening the connecting valve on the pipeline connecting one of the dissolving cylinders (230) and the gas cylinder (220), and injecting hydrogen into the gas cylinder (220), and stopping the injection when the injection pressure of the hydrogen reaches a preset pressure; S2. Controlling the gas transmission tube (322) to open, so that hydrogen dissolves in water. When the hydrogen dissolves in water and causes the volume of the water to change, the first piston plate (320) is lifted by the water with the changed volume and moves upward relative to the dissolution cylinder (230). When the first piston plate (320) moves upward, the second piston plate (310) moves downward an equal distance in the gas cylinder (220), thereby maintaining a preset pressure of the hydrogen. S3, decomposing the water containing dissolved hydrogen to obtain the amount of decomposed hydrogen; S4, after repeating step S1 and step S2, the gas cylinder (220) and the other dissolving cylinder (230) are evacuated, the connecting valve opened in step S1 is closed, and the connecting valve on the pipeline connecting the other dissolving cylinder (230) and the gas cylinder (220) is opened, the pipeline valve for transmitting liquid is opened, the water dissolving hydrogen is transmitted to the other dissolving cylinder (230) through the pipeline, and then the pipeline valve for transmitting liquid is closed, and the competitive gas is injected into the gas cylinder (220), and the injection of the competitive gas is stopped when the injection pressure of the competitive gas reaches a preset pressure; S5, repeating step S2, so that the second piston plate (310) moves downward by the same amount as the first piston plate (320); S6. Desorb the water containing the dissolved hydrogen and competitive gases, collect and record the total amount of the dissolved mixed gas, inject the collected mixed gas into a gas chromatography-mass spectrometer to determine the percentage of different gas components, calculate the amount of hydrogen and competitive gas after desorption, and compare the amount of hydrogen desorbed in step S3 to obtain the amount of hydrogen and methane dissolved in the formation water after competitive dissolution of the multi-component gases.

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