A device for preparing a standard of the henry constant of methane in water for experimental use

Abstract

The application discloses a kind of experimental water in methane henry constant standard preparation device, comprising: raw water treatment module, with raw water treatment tank and the heating module of being arranged in raw water treatment tank and the liquid in raw water treatment tank is heated;Standard addition processing module has processing cavity, standard addition component, oscillation device and constant temperature device, processing cavity is connected raw water treatment tank by pipeline, standard addition component is used to the solution in processing cavity with preset solubility methane standard gas;Oscillation device is used to the solution in processing cavity with preset concentration methane standard gas is added to oscillation, constant temperature device is used to the solution in processing cavity with preset concentration methane standard gas is added to set temperature heating or heat preservation;Gas supply module is communicated with raw water treatment tank and processing cavity by pipeline, and gas supply module is used to the solution in raw water treatment tank and processing cavity with argon, the henry constant standard preparation of experimental raw water under the high-efficiency realization of multiple set methane concentration standard gas is inhaled.

Description

Technical Field

[0001] This invention relates to the field of methane aqueous solution determination technology, and more specifically to an apparatus for preparing a standard for the Henry's constant of methane in experimental water. Background Technology

[0002] With the continuous upgrading and deepening of water environment, marine environment, and resource surveys, the content of dissolved methane in water has attracted much attention from scientists. The solubility of gases in water mainly depends on the strength of interstitial filling and hydration. Different solute compositions result in different interstitial filling and hydration strengths, leading to different Henry's constants at different temperatures and pressures. Various types of water, such as river water, lake water, seawater, distilled water, purified water, ultrapure water, deionized water, tap water, and sewage, have different compositions; more precisely, they contain different types of solutes. The Henry's constant for methane in these waters is not entirely the same, and its magnitude is closely related to the solute composition. Therefore, it is difficult to characterize the Henry's constant of methane in water using uniform data.

[0003] To accurately measure the methane concentration in water, it is necessary to first measure the methane content in that type of water and characterize the Henry's constant using set parameters. However, the experimental determination of the Henry's constant for methane in different solutes is quite complex. Different preparation and treatment methods for experimental raw water with different solutes exist under different environments, leading to difficulties in accurately expressing the Henry's constant for methane in different solutes due to variations in parameter standards and environmental settings.

[0004] Therefore, it is quite difficult to obtain a universal standard aqueous solution of methane to characterize the measurement of Henry's constant. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus for preparing a standard for the Henry's constant of methane in experimental water, so as to solve the technical problem of the lack of a unified parameter for characterizing the Henry's constant of methane in different solutes in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] An apparatus for preparing a standard for the Henry's constant of methane in experimental water, comprising:

[0008] The raw water treatment module includes a raw water treatment tank and a heating module disposed inside the raw water treatment tank to heat the liquid inside the raw water treatment tank.

[0009] The spiking module includes a processing chamber, a spiking assembly, an oscillation device, and a temperature control device. The processing chamber is connected to the raw water treatment tank via a pipe with a valve. The processing chamber is used to receive the solution transferred from the raw water treatment tank. The spiking assembly is used to inject a preset concentration of methane standard gas into the solution in the processing chamber.

[0010] The oscillation device is located at the bottom of the processing chamber and is used to oscillate the solution in the processing chamber with added methane standard gas of a preset concentration. The temperature control device is located inside the processing chamber and is used to heat or keep the solution in the processing chamber with added methane standard gas of a preset concentration at a set temperature.

[0011] The gas supply module is connected to the raw water treatment tank and the treatment chamber via a pipeline, and the gas supply module is used to introduce argon gas into the solution in the raw water treatment tank and the treatment chamber.

[0012] As a preferred embodiment of the present invention, the raw water treatment tank includes a raw water tank body and a raw water tank cover disposed on the raw water tank body. A liquid mixing chamber is disposed inside the raw water tank body. The gas supply module is used to supply gas to the liquid mixing chamber. The liquid mixing chamber is connected to the treatment chamber through a pipe with a valve.

[0013] The raw water tank cover is equipped with a pressure control valve that changes the pressure of the chamber located above the liquid surface in the liquid distribution chamber in accordance with the pressure provided by the gas supply module.

[0014] As a preferred embodiment of the present invention, the raw water tank includes, from top to bottom, a first liquid preparation chamber containing experimental raw water and a second liquid preparation chamber not containing experimental raw water. The two liquid preparation chambers are connected by a balancing structure, which is used to transport the treated experimental raw water in the first liquid preparation chamber to the second liquid preparation chamber. The second liquid preparation chamber is connected to the treatment chamber through a pipe with a valve.

[0015] As a preferred embodiment of the present invention, the processing chamber includes a tank and a cover disposed on the tank. The bottom of the tank is provided with a water inlet valve pipe and an air inlet. The cover is provided with an exhaust valve, a vacuum valve and a first sampling valve disposed in the middle of the tank in the radial direction. The tank is provided with a pressure replenishing mechanism inside, which is used to force the gas inside the tank to escape from the first sampling valve by means of air expansion.

[0016] As a preferred embodiment of the present invention, the interior of the tank is provided with a dividing component, which is used to divide the cavity inside the tank into an error characterization cavity located at the upper part of the dividing component and an experimental operation cavity located at the lower part of the dividing component. The dividing component is used to connect the error characterization cavity and the experimental operation cavity in an active or passive manner, and the pressure compensation mechanism is disposed in the experimental operation cavity.

[0017] As a preferred embodiment of the present invention, the dividing component includes a plate body that is sealed to the inner wall of the tank body, the edge of the plate body is connected to the inner wall of the tank body by a movable sealing ring, the plate body is provided with an array of valve groups, and the center of the plate body is provided with a second sampling valve that is on the same axis as the first sampling valve.

[0018] In a preferred embodiment of the present invention, the valve assembly operates by receiving external control signals, thereby connecting the error characterization chamber and the experimental operation chamber.

[0019] Alternatively, the valve assembly may operate after the relative pressure between the error characterization chamber and the experimental operation chamber reaches a set limit value, thereby connecting the error characterization chamber and the experimental operation chamber.

[0020] In a preferred embodiment of the present invention, the dividing component is movably mounted on the inner wall of the tank via an adjusting component. The adjusting component is used to adjust the upper and lower positions of the dividing component within the tank. The dividing component is provided with a second sampling valve for cooperating with the first sampling valve.

[0021] As a preferred embodiment of the present invention, the pressure replenishment mechanism includes a bladder located within the experimental operating chamber, and the air inlet of the bladder is sealed on the inner wall of the tank by a two-way valve.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention places the raw water for experimental treatment and standard methane gas, and performs gas-liquid equilibrium within an environmental component. This allows for the trace analysis and preparation of raw water in a single environment. It enables the addition and calibration of various concentrations of standard methane gas in the raw water while maintaining precise control over the composition of ions and gases. This yields standard Henry's constants for various concentrations of standard methane gas in the raw water, which can then be used to characterize the Henry's constants of other existing solutes. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the stock solution water preparation device is provided for an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a preparation apparatus having a first liquid preparation chamber and a second liquid preparation chamber is provided for embodiments of the present invention.

[0027] Figure 3 A schematic diagram of the spiking processing component is provided for an embodiment of the present invention.

[0028] The labels in the diagram represent the following:

[0029] 1-Tank body; 2-Raw water tank cover; 3-Inlet valve pipe; 4-Air inlet; 5-Exhaust valve; 6-Vacuum valve; 7-First sampling valve; 8-Pressure replenishment mechanism; 9-Dividing assembly; 10-Adjusting assembly; 11-Second sampling valve; 12-Raw water treatment module; 13-Air supply module; 14-First liquid preparation chamber; 15-Second liquid preparation chamber; 16-Balancing structure; 17-Heating module; 18-Spikeing module; 19-Treatment chamber; 20-Spikeing assembly; 21-Oscillating device; 22-Raw water treatment tank; 23-Constant temperature device; 121-Liquid preparation chamber; 122-Raw water tank cover; 123-Raw water tank body;

[0030] 81-Bag body; 82-Inlet opening; 83-Two-way valve;

[0031] 91-Error characterization chamber; 92-Experimental operation chamber; 93-Plate body; 94-Modible sealing ring; 95-Valve assembly. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1 As shown, the present invention provides an apparatus for preparing a standard for the Henry's constant of methane in experimental water, comprising:

[0034] The raw water treatment module 12 includes a raw water treatment tank 22 and a heating module 17 installed inside the raw water treatment tank to heat the liquid inside the raw water treatment tank 22.

[0035] The spiking module 18 includes a processing chamber 19, a spiking component 20, an oscillation device 21, and a constant temperature device 23. The processing chamber 19 is connected to the raw water treatment tank 22 through a pipe with a valve. The processing chamber 19 is used to receive the solution transferred from the raw water treatment tank 22. The spiking component 20 is used to inject methane standard gas of a preset concentration into the solution in the processing chamber.

[0036] The oscillation device 21 is located at the bottom of the processing chamber 19. The oscillation device 21 is used to oscillate the solution in the processing chamber with added methane standard gas of a preset concentration. The temperature control device 23 is located inside the processing chamber 19. The temperature control device 23 is used to heat or keep the solution in the processing chamber 22 with added methane standard gas of a preset concentration at a set temperature.

[0037] The gas supply module 13 is connected to the raw water treatment tank 22 and the treatment chamber 19 through a pipeline, and the gas supply module 13 is used to introduce argon gas into the solution in the raw water treatment tank 22 and the treatment chamber 19.

[0038] The raw water treatment tank 12 includes a raw water tank body 123 and a raw water tank cover 122 disposed on the raw water tank body 123. A liquid mixing chamber 121 is disposed inside the raw water tank body 122. An air supply module 13 is used to supply air to the liquid mixing chamber 121. The liquid mixing chamber 121 is connected to the treatment chamber 19 through a pipe with a valve.

[0039] The raw water tank cover 122 is equipped with a pressure control valve that changes the pressure of the chamber located above the liquid surface in the liquid distribution chamber 121 in accordance with the pressure provided by the gas supply module 13.

[0040] The raw water tank 123 includes, from top to bottom, a first liquid preparation chamber 14 containing experimental raw water and a second liquid preparation chamber 15 not containing experimental raw water. The two liquid preparation chambers 121 are connected by a balancing structure 16, which is used to transport the treated experimental raw water in the first liquid preparation chamber 14 to the second liquid preparation chamber 15. The second liquid preparation chamber 15 is connected to the treatment chamber 19 through a pipe with a valve.

[0041] In the preparation of raw water, the raw water treatment tank 22 and the treatment chamber 19 are evacuated to a negative vacuum pressure through a vacuum system. The air in the raw water treatment tank 22 and the treatment chamber 19 is replaced and removed by the argon gas supply system provided by the gas supply module 13. The raw water treatment module 12 is heated by the heating module 17 to boil and release the experimental raw water (specifically pure water). Then, the gas supply module 13 purges the solution in the raw water treatment tank 22 with argon gas to remove methane, thus obtaining the experimental raw solution.

[0042] Gas is collected in the raw water treatment module 12 and its content is detected by gas chromatography. If carbon dioxide is detected, the heating step is repeated. If methane is detected, the gas supply module 13 repeatedly purges the raw water treatment module 12. Then, the raw liquid is introduced into the treatment chamber 19 of the spiking treatment module 18. A preset concentration of methane standard gas is added to the experimental raw liquid through the spiking component 20. After oscillation by the oscillating device, the constant temperature water device 23 starts heating to reach the set constant temperature target temperature. After maintaining the target stable for a period of time, the treatment chamber 19 reaches a gas-liquid equilibrium state, and the raw water for determining Henry's constant is obtained.

[0043] The raw water treatment module 12 includes at least one liquid dispensing chamber 121 connected to the gas supply module 13, and a raw water tank cover 122 for sealing the liquid dispensing chamber. The gas supply module 13 is used to supply ambient gas to the liquid dispensing chamber 121.

[0044] The raw water tank cover 122 is used to actively or passively change the pressure of the chamber located above the liquid surface in the liquid distribution chamber 121 in conjunction with the pressure changes in the liquid distribution chamber 121 provided by the gas supply module 13.

[0045] like Figure 2 and Figure 3 As shown, the raw water treatment tank 123 of the present invention further includes a first liquid preparation chamber 14 containing experimental raw water and a second liquid preparation chamber 15 not containing experimental raw water. The two liquid preparation chambers 121 are connected by a balancing structure 16, wherein the balancing structure 16 can be a peristaltic pump or a micro pump capable of bidirectional transport. The pipe connecting the two liquid preparation chambers 121 is a circulation pipe capable of circulating transport of liquids in the two liquid preparation chambers. The balancing structure 16 is used to transport the treated experimental raw water to the second liquid preparation chamber 15 after the gas supply module 13 has supplied ambient gas and heated the first liquid preparation chamber 14.

[0046] The processing chamber 19 specifically includes a tank body 1 and a cover 2 disposed on the tank body 1. The bottom of the tank body 1 is provided with a water inlet valve pipe 3 and an air inlet 4 connected to the spiking assembly 20. The cover 2 is provided with an exhaust valve 5, a vacuum valve 6 and a first sampling valve 7 disposed in the middle of the tank body 1 in the radial direction. The tank body 1 is provided with a pressure replenishing mechanism 8. The pressure replenishing mechanism 8 is used to force the gas in the tank body to escape from the first sampling valve 7 by means of air expansion.

[0047] Specifically, the spiking component 20 can be a syringe or a sampling needle.

[0048] The pressure replenishing mechanism 8 in this invention is specifically an airbag with its port set on the inner wall of the tank 1. The airbag is installed on the inner wall of the tank 1 through a two-way valve. The airbag and the cavity inside the tank 1 are in an absolutely independent and sealed state, and are supplied with air through an external air source.

[0049] Furthermore, in this invention, in order to enable the measuring device to adapt to a wider range of gradient changes in headspace methane content at equilibrium, and to obtain more accurate measurement parameters by changing the experimental parameters through variable tank volume, and to quickly and conveniently calculate data errors.

[0050] The tank 1 of the present invention is provided with a dividing component 9 inside. The dividing component 9 is used to divide the cavity inside the tank 1 into an error characterization cavity 91 located at the upper part of the dividing component 9 and an experimental operation cavity 92 located at the lower part of the dividing component 9. The dividing component 9 is used to connect the error characterization cavity 91 and the experimental operation cavity 92 in an active or passive manner. The pressure compensation mechanism 8 is provided in the experimental operation cavity 92.

[0051] The dividing component 9 is movably mounted on the inner wall of the tank 1 via the adjusting component 10. The adjusting component 10 is used to adjust the upper and lower positions of the dividing component 9 within the tank. The dividing component 9 is provided with a second sampling valve 11 for cooperating with the first sampling valve 7.

[0052] In S200, high-purity argon gas is then injected into the upper chamber of the liquid until the pressure in all chambers reaches the set value. Then, the gas is evacuated through the exhaust valve to put the error characterization chamber under negative pressure until the error characterization chamber and the experimental operation chamber are just not connected, and the pressure in the experimental operation chamber reaches the set value.

[0053] The dividing assembly 9 includes a plate 93 that is sealed to the inner wall of the tank. The edge of the plate 93 is connected to the inner wall of the tank 1 by a movable sealing ring 94. The plate 93 is provided with an array of valve groups 95. The center of the plate 93 is set with a second sampling valve 11 that is on the same axis as the first sampling valve 7.

[0054] Among them, valve group 95 operates by receiving external control signals, connecting the error characterization chamber and the experimental operation chamber;

[0055] Alternatively, valve assembly 95 operates after the relative pressure between error characterization chamber 91 and experimental operation chamber 92 reaches a set limit value, thereby connecting error characterization chamber 91 and experimental operation chamber 92.

[0056] The specific principle is that, at a constant capacity, the pressure increase caused by filling with inactive gases such as rare gases does not affect the equilibrium. When other conditions remain constant, an increase in temperature shifts the equilibrium towards an endothermic reaction, while a decrease in temperature shifts the equilibrium towards an exothermic reaction. A catalyst can only shorten the time required to reach equilibrium; it cannot change the equilibrium state.

[0057] In reactions involving gas, gas generation, and changes in the number of gas molecules before and after the reaction, when other conditions remain constant, an increase in pressure (increase in pressure due to gas compression) shifts the equilibrium towards a decrease in gas volume; conversely, a decrease in pressure (increase in gas volume to reduce pressure) shifts the equilibrium towards a increase in gas volume. Therefore, this invention does not require consideration of plate weight.

[0058] In this invention, when sampling the headspace gas in the experimental operating chamber using a CH4 sampling and measuring instrument, the needle part of the sampling instrument can pass through the first sampling valve 7 and the second sampling valve 11 in sequence to sample and measure the headspace gas in the experimental operating chamber. When the sampling instrument is removed, it can be taken out from the second sampling valve 11 and the first sampling valve 7 in sequence. The first sampling valve 7 and the second sampling valve 11 are immediately closed when they are separated from the needle part, so that any gas that may be generated in the experimental operating chamber 92 will escape into the error characterization chamber and become the error parameter in the error characterization chamber 91.

[0059] Furthermore, the adjustment component 10 in this invention can be a permanent magnet ring structure set on the tank 1, and the plate 93 is made of metal. In this way, the position of the plate 93 can be adjusted by the adjustment component 10, and the plate 93 can be in a suspended state. This can more specifically represent the pressure changes in the error characterization chamber and the experimental operation chamber, as well as the position changes when in a gas-liquid equilibrium system during the experiment. This represents the volume changes of the error characterization chamber and the experimental operation chamber during the experiment. By superimposing a Hall sensor on the permanent magnet ring structure, the adjustment position of the plate 93 can be known.

[0060] Alternatively, the adjustment component 10 in this invention is a lead screw and nut pair transmission component, which adjusts the position of the plate 93 manually. This allows the measurement personnel to manually change the position of the plate 93, thereby changing the experimental parameters, quickly obtaining experimental parameters under different gas-liquid equilibrium volumes, and reducing the steps of error calibration.

[0061] The measuring device in this experimental design has the following characteristics: excellent sealing performance; real-time monitoring of headspace pressure within the chamber; convenient addition of a fixed amount of standard gas; and the ability to transfer headspace gas without altering its pressure or overall volume, thus maintaining the gas-liquid balance within the closed system.

[0062] The CH4 analyzer can perform tens to thousands of consecutive measurements in the same error characterization chamber, selecting the average of the most stable data range as the measured value for that sample. Compared to gas chromatography, it offers higher accuracy and a lower detection limit. It is suitable for mixed gas samples with methane content below or above 1×10⁻⁶.

[0063] The varying equilibration times affect the headspace-liquid equilibrium in the system, as well as the concentration of the gas in the gas-phase mixture. Too short a time prevents the target gas from effectively evaporating into the gas phase, failing to reach a stable equilibrium. Too long a time prolongs experimental analysis time and increases errors.

[0064] For example: Take six vacuum-treated gas-liquid equilibrium mixing devices ①②......⑥. Introduce 2.5L of experimental water into each device and fill with 99.999% high-purity argon gas until the internal pressure reaches 101325Pa. Shake for 30 minutes. Then simultaneously place them in a 25℃ constant-temperature water bath for settling. Every 1 hour, extract headspace gas samples from one mixing device for methane content testing. The results show that the headspace methane content varies significantly within the 1-2 hour range, indicating that the methane gas in the closed system has not yet reached gas-liquid equilibrium during this time. After 2 hours, the headspace methane concentration in the closed system remains essentially unchanged, indicating that the system has reached equilibrium after 2 hours. Therefore, at 25℃ and one atmosphere, it takes at least 2 hours for methane gas in a closed system to reach gas-liquid equilibrium. In this invention, the volume of the experimental operating chamber can be synchronously adjusted using the segmented component 9 to accelerate or increase the system equilibrium time or provide more synchronous adjustment methods for gas-liquid equilibrium parameters.

[0065] To further explain, the pressure replenishment mechanism 8 includes a bladder 81 located within the experimental operating chamber 92, and the air inlet 82 of the bladder 81 is sealed and installed on the inner wall of the tank 1 by a two-way valve 83.

[0066] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. An apparatus for preparing a standard for the Henry's constant of methane in experimental water, characterized in that, include: The raw water treatment module (12) includes a raw water treatment tank (22) and a heating module (17) installed inside the raw water treatment tank to heat the liquid inside the raw water treatment tank (22). The spiking module (18) includes a processing chamber (19), a spiking assembly (20), an oscillation device (21), and a constant temperature device (23). The processing chamber (19) is connected to the raw water treatment tank (22) through a pipe with a valve. The processing chamber (19) is used to receive the solution transferred from the raw water treatment tank (22). The spiking assembly (20) is used to add a preset concentration of methane standard gas to the solution in the processing chamber. The oscillation device (21) is located at the bottom of the processing chamber (19). The oscillation device (21) is used to oscillate the solution in the processing chamber with added methane standard gas of a preset concentration. The constant temperature device (23) is located inside the processing chamber (19). The constant temperature device (23) is used to heat or keep the solution in the processing chamber (19) with added methane standard gas of a preset concentration at a set temperature. The gas supply module (13) is connected to the raw water treatment tank (22) and the treatment chamber (19) through a pipeline, and the gas supply module (13) is used to introduce argon gas into the solution in the raw water treatment tank (22) and the treatment chamber (19); The processing chamber (19) includes a tank (1) and a cover (2) provided on the tank (1). The bottom of the tank (1) is provided with a water inlet valve pipe (3) and an air inlet (4). The cover (2) is provided with an exhaust valve (5), a vacuum valve (6) and a first sampling valve (7) provided in the middle of the tank (1) in the radial direction. The tank (1) is provided with a pressure replenishing mechanism (8). The pressure replenishing mechanism (8) is used to force the gas in the tank to escape from the first sampling valve (7) by means of inflation expansion. The tank (1) is provided with a dividing component (9) inside. The dividing component (9) is used to divide the cavity inside the tank (1) into an error characterization cavity (91) located at the upper part of the dividing component (9) and an experimental operation cavity (92) located at the lower part of the dividing component (9). The dividing component (9) is used to connect the error characterization cavity (91) and the experimental operation cavity (92) in an active or passive manner. The pressure compensation mechanism (8) is provided in the experimental operation cavity (92). The dividing assembly (9) includes a plate (93) that is sealed to the inner wall of the tank. The edge of the plate (93) is connected to the inner wall of the tank (1) by a movable sealing ring (94). An array of valve groups (95) is provided on the plate (93). A second sampling valve (11) is provided at the center of the plate (93) and is on the same axis as the first sampling valve (7). The valve assembly (95) operates by receiving external control signals, thereby connecting the error characterization chamber and the experimental operation chamber. Alternatively, the valve assembly (95) operates after the relative pressure between the error characterization chamber (91) and the experimental operation chamber (92) reaches a set limit value, thereby connecting the error characterization chamber (91) and the experimental operation chamber (92).

2. The apparatus for preparing a standard for the Henry's constant of methane in experimental water according to claim 1, characterized in that, The raw water treatment tank (22) includes a raw water tank body (123) and a raw water tank cover (122) disposed on the raw water tank body (123). A liquid mixing chamber (121) is disposed inside the raw water tank body (123). The gas supply module (13) is used to supply gas to the liquid mixing chamber (121). The liquid mixing chamber (121) is connected to the treatment chamber (19) through a pipe with a valve. The raw water tank cover (122) is provided with a pressure control valve for changing the pressure of the chamber located above the liquid surface in the liquid distribution chamber (121) in accordance with the pressure provided by the gas supply module (13).

3. The apparatus for preparing a standard for the Henry's constant of methane in experimental water according to claim 2, characterized in that, The raw water tank (123) includes, from top to bottom, a first liquid preparation chamber (14) containing experimental raw water and a second liquid preparation chamber (15) not containing experimental raw water. The two liquid preparation chambers (121) are connected by a balancing structure (16). The balancing structure (16) is used to transport the treated experimental raw water in the first liquid preparation chamber (14) to the second liquid preparation chamber (15). The second liquid preparation chamber (15) is connected to the treatment chamber (19) through a pipe with a valve.

4. The apparatus for preparing a standard for the Henry's constant of methane in experimental water according to claim 3, characterized in that, The dividing component (9) is movably mounted on the inner wall of the tank (1) via the adjusting component (10). The adjusting component (10) is used to adjust the upper and lower positions of the dividing component (9) within the tank. The dividing component (9) is provided with a second sampling valve (11) for cooperating with the first sampling valve (7).

5. The apparatus for preparing a standard for the Henry's constant of methane in experimental water according to claim 4, characterized in that, The pressure replenishment mechanism (8) includes a bladder (81) located in the experimental operation chamber (92), and the air inlet (82) of the bladder (81) is sealed on the inner wall of the tank (1) by a two-way valve (83).

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