Device and method for measuring gas solubility

Abstract

The application relates to the technical field of gas solubility testing, and relates to a gas solubility measuring device and method.The former comprises an equilibrium kettle, a pressurizing assembly, a first cylinder, a second cylinder and a first driving mechanism.The equilibrium kettle comprises a mixing cylinder, an upper end cover, a lower end cover and a sapphire glass cylinder.The lower end cover is fixedly arranged at the lower end of the mixing cylinder, and the upper end of the mixing cylinder is provided with a connecting hole communicating with the inside and outside.The application has a reasonable and compact structure, the mixing cylinder and the sapphire glass cylinder can mix the measured gas and the test liquid, the first driving mechanism is arranged, the first piston rod can be driven to reciprocate in the first cylinder, the measured gas in the pressurizing assembly can be quickly dissolved in the test liquid in the mixing cylinder, the sapphire glass cylinder is convenient for observing the gas phase when the measured gas is dissolved and balanced in the test liquid, the operation is convenient, and the accuracy of the test result can be improved.

Description

Technical Field

[0001] This invention relates to the field of gas solubility testing technology, and is a device and method for measuring gas solubility. Background Technology

[0002] Gas solubility testing is a method for quantifying the ability of gases to dissolve in a liquid phase, and it has important applications in many industrial fields. In environmental science, determining the solubility of greenhouse gases such as carbon dioxide in water can assess ocean acidification and climate change, supporting carbon sequestration technologies. In chemical production, such as ammonia synthesis and beverage manufacturing, precise control of gas solubility is required to ensure quality and efficiency. In the biomedical field, solubility analysis helps in the diagnosis and treatment of diseases by analyzing the mechanisms of oxygen and carbon dioxide transport in blood. In addition, gas solubility data provides fundamental support for process optimization and scientific innovation in energy development, food processing, and water quality monitoring.

[0003] Currently, the equilibrium-desorption method is mainly used to test gas solubility. First, the gas and liquid phases are brought to a dissolution equilibrium state under certain temperature and pressure. Then, the gas and liquid phases are separated by flash evaporation or desorption under normal temperature and pressure. The solubility is then calculated after measuring the volumes of the gas and liquid separately.

[0004] Chinese patent document CN115452985A discloses an apparatus for determining the solubility parameters of a gas in a liquid and its application. The apparatus includes a gas phase feeding device, a measuring device, a gas phase collecting device, a liquid phase feeding device, a liquid phase collecting device, a temperature control device, an inert gas replacement device, and a computer device. The gas phase feeding device, measuring device, and gas phase collecting device are interconnected. The liquid phase feeding device, measuring device, and liquid phase collecting device are interconnected. The gas phase feeding device, measuring device, and temperature control device are each connected to the computer device. The inert gas replacement device is connected to the gas phase feeding device, measuring device, gas phase collecting device, liquid phase feeding device, liquid phase collecting device, and temperature control device.

[0005] Chinese patent document CN106814177A discloses a device and method for testing the physical properties of gases in extra-heavy oil. The device includes: a high-temperature and high-pressure mixing unit, a density measurement unit, a viscosity measurement unit, a sampling unit, and a solubility measurement unit. The high-temperature and high-pressure mixing unit is connected to the density measurement unit, viscosity measurement unit, sampling unit, and solubility measurement unit, respectively. The sampling unit is connected to the density measurement unit, viscosity measurement unit, and solubility measurement unit, respectively. The high-temperature and high-pressure mixing unit includes a sample preparation device and a control device. The sample preparation device is equipped with an inlet and an outlet, and the control device includes a heater.

[0006] In the above testing methods, the solute ratio can easily change when the liquid phase is transferred between different devices; and gas components may remain in the liquid phase after gas-liquid desorption separation, leading to errors in gas solubility calculations. This method is only suitable for measuring the solubility of gases that are slightly soluble or insoluble in liquids at normal pressure and do not contain volatile components in the liquid medium. Furthermore, due to the presence of a phase interface between the gas and liquid, the dissolution process is relatively slow, and it is difficult to quickly reach phase equilibrium using only stirring methods, resulting in a long testing time.

[0007] From a thermodynamic perspective, the dissolution of a gas in a liquid is a dynamic phase equilibrium process. Initially, when the liquid solvent and gaseous solute come into contact, the gas gradually dissolves in the liquid phase, while volatile components from the liquid solvent enter the gas phase. When the gas is saturated and dissolved in the liquid, i.e., in gas-liquid phase equilibrium, both the volume and composition of the gas and liquid phases change relative to the initial state. To accurately determine the solubility of a gas, it is necessary to precisely measure the liquid volume and the equivalent gas volume that enters the liquid from the gas phase. Summary of the Invention

[0008] This invention provides a device and method for measuring gas solubility, which overcomes the shortcomings of the prior art and effectively solves the problem that the dissolution process is relatively slow in existing gas solubility measurements.

[0009] One of the technical solutions of this invention is achieved through the following measures: A gas solubility measuring device includes a balance vessel, a pressurizing component, a first cylinder, a second cylinder, and a first driving mechanism. The balance vessel includes a mixing cylinder, an upper end cover, a lower end cover, and a sapphire glass tube. The lower end cover is sealed and fixedly installed at the lower end of the mixing cylinder. The upper end of the mixing cylinder has a connecting hole that communicates internally and externally. The upper end cover is located above the mixing cylinder. A sapphire glass tube is fixedly installed between the center of the upper end cover and the connecting hole. A first connecting line is installed at the center of the upper end cover. A sampling valve is installed on the first connecting line. The lower outer side of the mixing cylinder has a liquid inlet that communicates internally and externally. A liquid inlet line is fixedly connected to the outer side of the mixing cylinder corresponding to the position of the liquid inlet line. A sampling valve is installed above the position of the liquid inlet line. The lower outer side of the mixing cylinder is provided with an internally and externally connected mounting hole. A first cylinder is fixedly installed on the outer side of the mixing cylinder corresponding to the mounting hole position. The left end of the first cylinder is provided with an internally and externally connected connecting hole. The first cylinder is provided with a first piston rod whose right end is sealed and passes through the right end of the first cylinder. A second cylinder is provided to the right of the first cylinder. The second cylinder is provided with a second piston rod whose left end is sealed and passes through the left end of the second cylinder. A first drive mechanism is connected between the right end of the first piston rod and the left end of the second piston rod. The right end of the second cylinder is provided with a first pressurizing hole and a second pressurizing hole that are internally and externally connected at intervals. The first pressurizing hole is fixedly connected to the outlet of the pressurizing component. A second connecting pipe is fixedly connected between the first connecting pipe at the position between the sampling valve and the upper end cover and the second pressurizing hole.

[0010] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions:

[0011] The aforementioned balance vessel may also include a stirring shaft, stirring blades, a stirring motor, and a magnetic coupler. The stirring shaft is rotatably mounted on the upper end of the lower end cover. Several stirring blades are fixedly mounted at intervals along the circumference on the outer side of the stirring shaft. The stirring motor is located below the lower end cover. The output shaft of the stirring motor is connected to the stirring shaft via a magnetic coupler. A scale marking layer is provided on the outer side of the sapphire glass cylinder.

[0012] The above may also include a three-way valve and a drain line. A three-way valve is installed between the first connecting line and the drain line at the position between the second connecting line and the upper end cover. A first pressure gauge is installed on the first connecting line at the position between the three-way valve and the sampling valve. An inlet valve is installed on the inlet line.

[0013] The aforementioned pressurization assembly may include a pressurizing cylinder, a pressurizing piston rod, an insulation box, a gas cylinder, and a second drive mechanism. The pressurizing cylinder, the first cylinder, the second cylinder, and the balance vessel are all installed inside the insulation box. The pressurizing cylinder is provided with a pressurizing piston rod that passes through the left end of the pressurizing cylinder and is sealed at the left end. The left end of the pressurizing piston rod is connected to the right end of the output shaft of the second drive mechanism. The right end of the pressurizing cylinder is provided with an inlet and an outlet that are connected internally and externally. An inlet pipeline is fixedly connected between the inlet and the outlet of the gas cylinder. An inlet check valve is installed on the inlet pipeline. A pressure reducing valve is installed on the inlet pipeline at the position between the inlet check valve and the gas cylinder. An outlet pipeline is fixedly connected between the outlet and the first pressurization port. An outlet check valve is installed on the outlet pipeline.

[0014] The right side of the aforementioned booster cylinder body may be provided with a test hole that connects the inside and outside, and a second pressure gauge is fixedly installed on the right side of the booster cylinder body corresponding to the test hole position.

[0015] The second technical solution of the present invention is achieved through the following measures: a method for measuring gas solubility, comprising the following steps:

[0016] S1, open the liquid inlet valve, close the sampling valve, connect the upper end of the sapphire glass tube to the first connecting line through the three-way valve, and use the gas to be tested in the gas cylinder to purge the mixing cylinder, the first cylinder, the second cylinder, the first connecting line, the second connecting line and the liquid inlet line. After purging, connect the upper end of the sapphire glass tube to the venting line through the three-way valve.

[0017] S2, start the first drive mechanism, move the left end of the first piston rod to the left end of the first cylinder, and stop the first drive mechanism;

[0018] S3, introduce the test liquid into the mixing cylinder through the inlet funnel, and close the inlet valve after the test liquid flows out of the end of the drain line;

[0019] S4, adjust the temperature of the insulated box to the set value;

[0020] S5, start the second drive mechanism. After the booster piston rod moves back and forth, it delivers the gas to be measured in the gas cylinder to the second cylinder. When the first pressure gauge reading reaches the set value, record the volume of the booster cylinder and the second pressure gauge reading, and stop the second drive mechanism.

[0021] S6, start the stirring motor to drive the stirring blades to rotate;

[0022] S7, the upper end of the sapphire glass tube is connected to the first connecting line through the three-way valve, and the gas to be measured in the first connecting line enters the mixing cylinder;

[0023] S8, the first drive mechanism is activated, and the first piston rod accelerates the dissolution rate of the gas being tested in the test liquid when it reciprocates left and right.

[0024] S9, when the first pressure reading decreases, the second drive mechanism is activated to restore the first pressure reading to the set value;

[0025] S10, repeat steps S8 to S9 until the first pressure gauge reading stabilizes, then stop the second drive mechanism;

[0026] S11, start the first drive mechanism, the first piston rod moves to the right and draws the test liquid from the mixing cylinder until the gas phase is observed in the sapphire glass tube, obtain the volume value from the scale marking layer, and record the volume of the booster cylinder and the reading of the second pressure gauge again.

[0027] S12, open the sampling valve, take a sample from the first connecting pipeline, analyze the gas phase composition using gas chromatography, and obtain the volume percentage of the gas being measured.

[0028] The following are further optimizations and / or improvements to the second technical solution of the above invention:

[0029] The purging process in step S1 above is as follows: Open the gas cylinder and adjust the pressure reducing valve so that the pressure of the inlet pipeline is at the set value. Start the second drive mechanism. After the booster piston rod moves to the left, it draws in the gas to be tested from the gas cylinder. After the booster piston rod moves to the right, it delivers the gas to be tested in the booster cylinder to the second cylinder. Start the first drive mechanism. The first piston rod and the second piston rod move back and forth. The gas to be tested in the second cylinder is delivered to the first connecting pipeline, the sapphire glass cylinder and the mixing cylinder, and then discharged after passing through the liquid inlet pipeline.

[0030] The present invention has a reasonable and compact structure. The mixing cylinder and the sapphire glass cylinder can mix the gas to be tested and the test liquid. By setting the first driving mechanism, the first piston rod can be driven to move back and forth in the first cylinder. This allows the gas to be tested in the pressurization component to dissolve quickly with the test liquid in the mixing cylinder. The sapphire glass cylinder facilitates the observation when the gas to be tested reaches equilibrium in the test liquid and a gas phase appears. The operation is more convenient and can improve the accuracy of the test results. Attached Figure Description

[0031] Appendix Figure 1 These are schematic diagrams of the main cross-sectional structure of embodiments one to seven of the present invention.

[0032] The codes in the attached diagram are as follows: 1 for the first cylinder, 2 for the second cylinder, 3 for the first drive mechanism, 4 for the mixing cylinder, 5 for the upper end cap, 6 for the lower end cap, 7 for the sapphire glass cylinder, 8 for the first connecting pipeline, 9 for the sampling valve, 10 for the liquid inlet pipeline, 11 for the first piston rod, 12 for the second piston rod, 13 for the second connecting pipeline, 14 for the stirring shaft, 15 for the stirring blade, 16 for the stirring motor, 17 for the magnetic coupler, 18 for the scale marking layer, 19 for the three-way valve, 20 for the venting pipeline, 21 for the first pressure gauge, 22 for the liquid inlet valve, 23 for the liquid inlet funnel, 24 for the pressurizing cylinder, 25 for the pressurizing piston rod, 26 for the insulation box, 27 for the gas cylinder, 28 for the second drive mechanism, 29 for the air inlet pipeline, 30 for the air inlet check valve, 31 for the pressure reducing valve, 32 for the air outlet pipeline, 33 for the air outlet check valve, and 34 for the second pressure gauge. Detailed Implementation

[0033] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0034] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0035] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0036] Example 1: As shown in the attached document Figure 1As shown, the gas solubility measuring device includes a balance vessel, a pressurizing component, a first cylinder 1, a second cylinder 2, and a first drive mechanism 3. The balance vessel includes a mixing cylinder 4, an upper end cover 5, a lower end cover 6, and a sapphire glass tube 7. The lower end cover 6 is sealed and fixedly installed at the lower end of the mixing cylinder 4. The upper end of the mixing cylinder 4 has a connecting hole that communicates with the inside and outside. The upper end cover 5 is located above the mixing cylinder 4. The sapphire glass tube 7 is fixedly installed between the center of the upper end cover 5 and the connecting hole. A first connecting line 8 is installed at the center of the upper end cover 5. A sampling valve 9 is installed on the first connecting line 8. The lower outer side of the mixing cylinder 4 has a liquid inlet that communicates with the inside and outside. A liquid inlet line 10 is fixedly connected to the outer side of the mixing cylinder 4 corresponding to the position of the liquid inlet. The lower outer side of the mixing cylinder 4 corresponding to the position above the liquid inlet has a... An internally and externally connected mounting hole is provided. A first cylinder 1 is fixedly installed on the outside of the mixing cylinder 4 corresponding to the mounting hole position. The left end of the first cylinder 1 is provided with an internally and externally connected connecting hole. The first piston rod 11 with its right end sealed and passing through the right end of the first cylinder 1 is provided inside the first cylinder 1. A second cylinder 2 is provided to the right of the first cylinder 1. The second piston rod 12 with its left end sealed and passing through the left end of the second cylinder 2 is provided inside the second cylinder 2. A first drive mechanism 3 is connected between the right end of the first piston rod 11 and the left end of the second piston rod 12. The right end of the second cylinder 2 is provided with a first pressurizing hole and a second pressurizing hole with internally and externally connected at intervals. The first pressurizing hole is fixedly connected to the outlet of the pressurizing component. A second connecting pipe 13 is fixedly connected between the first connecting pipe 8 corresponding to the position between the sampling valve 9 and the upper end cover 5 and the second pressurizing hole.

[0037] According to the requirements, the mixing cylinder 4 has a cylindrical structure with the upper end closed and the lower end open. The upper end cover 5 has a through hole in the center. The sapphire glass cylinder 7 has a tubular structure. The first driving mechanism 3 is a known technology, such as the driving mechanism described in the test device and method for gas viscosity under multiple working conditions disclosed in Chinese patent document CN120352295A.

[0038] During use, the mixing cylinder 4 and the sapphire glass cylinder 7 can mix the gas to be tested and the test liquid. By setting the first driving mechanism 3, the first piston rod 11 can be driven to move back and forth in the first cylinder 1. This allows the gas to be tested in the pressurizing component to dissolve quickly with the test liquid in the mixing cylinder 4. The sapphire glass cylinder 7 facilitates observation when the gas to be tested reaches equilibrium in the test liquid and a gas phase appears, making operation more convenient and improving the accuracy of test results. The setting of the first connecting pipeline 8 and the sampling valve 9 facilitates the sampling operation of the mixed liquid.

[0039] The above-mentioned gas solubility measuring device can be further optimized and / or improved according to actual needs:

[0040] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1As shown, the balance vessel also includes a stirring shaft 14, stirring blades 15, a stirring motor 16, and a magnetic coupler 17. The stirring shaft 14 is rotatably mounted on the upper end of the lower end cover 6. Several stirring blades 15 are fixedly mounted at intervals along the circumference on the outer side of the stirring shaft 14. The stirring motor 16 is located below the lower end cover 6. The output shaft of the stirring motor 16 is connected to the stirring shaft 14 through the magnetic coupler 17. The outer side of the sapphire glass cylinder 7 is provided with a scale marking layer 18.

[0041] According to the requirements, the magnetic coupler 17 (magnetic coupling) is a known existing technology. During use, by setting the magnetic coupler 17, leakage caused by poor sealing at the connection between the output shaft of the stirring motor 16 or the stirring shaft 14 and the lower end cover 6 can be avoided, which can improve the measurement accuracy. The sapphire glass cylinder 7 is provided with a scale marking layer 18 on the outside, which can obtain the volume from the first connecting pipe 8 to the corresponding position of the scale line. This allows the dissolved volume of the gas being measured to be obtained, making the measurement more convenient. The reciprocating movement of the first piston rod 11 allows the gas being measured to continuously enter and leave the balance vessel from the second cylinder, promoting turbulent contact between the gas being measured and the test liquid. At the same time, the rotation of the stirring blades 15 can accelerate the dissolution of the gas being measured and shorten the gas-liquid equilibrium time.

[0042] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, it also includes a three-way valve 19 and an emptying pipeline 20. A three-way valve 19 is installed between the first connecting pipeline 8, which is located between the second connecting pipeline 13 and the upper end cap 5, and the emptying pipeline 20. A first pressure gauge 21 is installed on the first connecting pipeline 8, which is located between the three-way valve 19 and the sampling valve 9. An inlet valve 22 is installed on the inlet pipeline 10.

[0043] According to the requirements, an inlet funnel 23 is provided above the mixing cylinder 4. The inlet pipeline 10 is fixedly connected between the lower end of the inlet funnel 23 and the inlet hole. The inlet pipeline 10 can also be fixedly connected between the inlet hole and the outlet of the inlet device. In the first state, the upper end of the sapphire glass cylinder 7 and the drain pipeline 20 are not connected. In the second state, the upper end of the sapphire glass cylinder 7 and the drain pipeline 20 are connected. The first pressure gauge 21 can obtain the pressure in the first connecting pipeline 8. The scale marking layer 18 can obtain the volume from the three-way valve 19 to the corresponding position of the scale line.

[0044] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1As shown, the pressurization assembly includes a pressurizing cylinder 24, a pressurizing piston rod 25, an insulation box 26, a gas cylinder 27, and a second drive mechanism 28. The pressurizing cylinder 24, the first cylinder 1, the second cylinder 2, and the balance vessel are all installed inside the insulation box 26. The pressurizing cylinder 24 has a pressurizing piston rod 25 with its left end sealed and passing through the left end of the pressurizing cylinder 24. The left end of the pressurizing piston rod 25 is connected to the right end of the output shaft of the second drive mechanism 28. The right end of the pressurizing cylinder 24 has an inlet and an outlet that are connected internally and externally. An air inlet line 29 is fixedly connected between the inlet and the outlet of the gas cylinder 27. An air inlet check valve 30 is installed on the air inlet line 29. A pressure reducing valve 31 is installed on the air inlet line 29 at the position between the air inlet check valve 30 and the gas cylinder 27. An air outlet line 32 is fixedly connected between the outlet and the first pressurization hole. An air outlet check valve 33 is installed on the air outlet line 32.

[0045] Depending on the requirements, the insulated box 26 is a known constant temperature box. Alternatively, a heat tracing device can be installed on the outer surface of the pressurizing cylinder 24, the first cylinder 1, the second cylinder 2, and the balance vessel. The second drive mechanism 28 has the same structure as the first drive mechanism 3. During use, the second drive mechanism 28 continuously operates, driving the pressurizing piston rod 25 to move back and forth, thus continuously inputting the gas to be tested from the gas cylinder 27 into the second cylinder 2 and the first connecting pipeline 8.

[0046] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, a test hole with internal and external communication is provided on the outer side of the right side of the booster cylinder 24, and a second pressure gauge 34 is fixedly installed on the right side of the booster cylinder 24 corresponding to the test hole position.

[0047] During use, the pressure of the gas being measured inside the booster cylinder 24 can be observed in real time by setting the second pressure gauge 34.

[0048] Example 6: As attached Figure 1 As shown, the method for measuring the solubility of this gas includes the following steps:

[0049] S1, open the liquid inlet valve 22, close the sampling valve 9, connect the upper end of the sapphire glass tube 7 to the first connecting line 8 through the three-way valve 19, and use the gas to be tested in the gas cylinder 27 to purge the mixing cylinder 4, the first cylinder 1, the second cylinder 2, the first connecting line 8, the second connecting line 13 and the liquid inlet line 10. After purging, connect the upper end of the sapphire glass tube 7 to the venting line 20 through the three-way valve 19.

[0050] S2, start the first drive mechanism 3, move the left end of the first piston rod 11 to the left end of the first cylinder 1, and stop the first drive mechanism 3;

[0051] S3, introduce the test liquid into the mixing cylinder 4 through the inlet funnel 23, and close the inlet valve 22 after the test liquid flows out of the end of the drain line 20.

[0052] S4, adjust the temperature of the insulation box 26 to the set value;

[0053] S5, start the second drive mechanism 28, after the booster piston rod 25 reciprocates left and right, it delivers the gas to be measured in the gas cylinder 27 to the second cylinder 2. When the reading of the first pressure gauge 21 reaches the set value, record the volume of the booster cylinder 24 and the reading of the second pressure gauge 34, and stop the second drive mechanism 28.

[0054] S6, start the stirring motor 16, which drives the stirring blade 15 to rotate;

[0055] S7, the upper end of the sapphire glass cylinder 7 is connected to the first connecting line 8 through the three-way valve 19, and the gas to be measured in the first connecting line 8 enters the mixing cylinder 4.

[0056] S8, the first drive mechanism 3 is started, and the first piston rod 11 accelerates the dissolution rate of the gas being tested in the test liquid when it reciprocates left and right;

[0057] S9, when the reading of the first pressure gauge 21 decreases, the second drive mechanism 28 is activated to restore the reading of the first pressure gauge 21 to the set value;

[0058] S10, repeat steps S8 to S9 until the reading of the first pressure gauge 21 is stable, then stop the second drive mechanism 28;

[0059] S11, start the first drive mechanism 3, the first piston rod 11 moves to the right and draws the test liquid from the mixing cylinder 4 until the gas phase is observed in the sapphire glass cylinder 7, the volume value is obtained by the scale marking layer 18, and the volume of the booster cylinder 24 and the reading of the second pressure gauge 34 are recorded again.

[0060] S12, open sampling valve 9, take a sample from first connecting line 8, analyze the gas phase composition using gas chromatography, and obtain the volume percentage of the gas being measured.

[0061] In step S5, when the reading of the first pressure gauge 21 reaches the set value p, the volume V of the rodless chamber of the booster cylinder 24 is recorded. 21 The reading of the second pressure gauge 34 is p 21 The volume V of the rodless chamber of the booster cylinder 24 21 The volume V of the rodless chamber of the booster cylinder 24 can be determined by comparing the position of the booster piston rod 25 with its initial position. The product of the inner diameter of the booster cylinder 24 and the distance the booster piston rod 25 has moved relative to its initial position is the volume V of the rodless chamber of the booster cylinder 24. 21Stop the second drive mechanism 28; in step S11, start the first drive mechanism 3, and after the first piston rod 11 moves to the right, it extracts a volume of V from the mixing cylinder 4. i The liquid was observed until the gas phase was detected in the sapphire glass tube 7, and the volume value V was obtained from the scale marking layer 18. K Record the volume V of the rodless chamber of the booster cylinder 24. 22 The reading of the second pressure gauge 34 is p 22 In step S12, gas chromatography is used to analyze the gas phase components and obtain the volume percentage n of the gas being measured.

[0062] The initial volume of the liquid is V, which is the volume of the chamber between the upper end of the lower cap 6 and the three-way valve 19. F Initially, the gas phase volume is the sum of the volumes of the second cylinder 2, the second connecting line 13, and the first connecting line 8 between the second connecting line 13 and the three-way valve 19, denoted as V. S After dissolution equilibrium is reached, the liquid volume expands and the gas phase volume decreases, with the volume change being V. i -V K .

[0063] The initial equivalent volume of the gas being measured is V1, and the formula for calculating V1 is:

[0064]

[0065] Where, p 21 The reading of the second pressure gauge 34 in step S5 is MPa; V 21 The volume of the rodless chamber of the booster cylinder 24 in step S5 (the volume between the right end of the booster piston rod 25 and the booster cylinder 24), m 3 p is the set value of the first pressure gauge 21, in MPa; V S Let m be the volume of the gas phase. 3 .

[0066] The equivalent volume of the measured gas after equilibrium is V2, and the formula for calculating V2 is:

[0067]

[0068] Where, p 22 The reading of the second pressure gauge 34 in step S11 is MPa; V 22 The volume of the rodless chamber of the booster cylinder 24 in step S11 is m. 3 p is the set value of the first pressure gauge 21, in MPa; V S Let m be the volume of the gas phase. 3 ; The change in volume of the gas being measured is expressed in m. 3 n represents the volume percentage of the gas being measured.

[0069] The equivalent volume of the gas dissolved in the liquid is V. g V g The calculation formula is:

[0070]

[0071] Where V1 is the initial equivalent volume of the measured gas, m 3 V2 is the equivalent volume of the measured gas after equilibrium, in meters. 3 .

[0072] The actual volume of the test liquid is V L V L The calculation formula is:

[0073]

[0074] Among them, V F To test the initial volume of the liquid, m 3 ; The change in volume of the gas being measured is expressed in m. 3 .

[0075] The Ostwald solubility coefficient (equilibrium constant) is S, and the formula for calculating S is:

[0076]

[0077] Among them, V g To test the equivalent volume of gas dissolved in the liquid, m 3 V L To test the actual volume of the liquid, m 3 .

[0078] The above method for measuring gas solubility can be further optimized and / or improved according to actual needs:

[0079] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 1 As shown, the purging process in step S1 is as follows: the gas cylinder 27 is opened and the pressure reducing valve 31 is adjusted so that the pressure of the inlet pipeline 29 is set to the set value. The second drive mechanism 28 is started. After the booster piston rod 25 moves to the left, it draws in the gas to be tested from the gas cylinder 27. After the booster piston rod 25 moves to the right, it delivers the gas to be tested in the booster cylinder 24 to the second cylinder 2. The first drive mechanism 3 is started. The first piston rod 11 and the second piston rod 12 move back and forth. The gas to be tested in the second cylinder 2 is delivered to the first connecting pipeline 8, the sapphire glass cylinder 7 and the mixing cylinder 4, and then discharged after passing through the liquid inlet pipeline 10.

[0080] During the reciprocating motion of the first piston rod 11 and the second piston rod 12, the gas to be tested in the gas cylinder 27 can be used to purge the first cylinder 1 and the second cylinder 2. The reciprocating motion of the first piston rod 11 and the second piston rod 12 ensures that the purging of the first cylinder 1 and the second cylinder 2 is more thorough. The upper end of the sapphire glass tube 7 is connected to the first connecting line 8 through the three-way valve 19, that is, the upper end of the sapphire glass tube 7 is not connected to the venting line 20 through the three-way valve 19. The upper end of the sapphire glass tube 7 is connected to the second connecting line 13 through the first connecting line 8.

[0081] After purging, stop the first drive mechanism 3 and the second drive mechanism 28, and repeat the purging process multiple times. This can remove impurities from the first connecting line 8, sapphire glass cylinder 7, mixing cylinder 4, first cylinder 1, second cylinder 2 and liquid inlet line 10, thus avoiding any impact on the measurement process and improving the accuracy of the measurement results.

[0082] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A device for measuring the solubility of a gas, characterized in that The balance kettle comprises a mixing cylinder, an upper end cover, a lower end cover, and a sapphire glass cylinder, the lower end of the mixing cylinder is fixedly and sealingly installed with the lower end cover, the upper end of the mixing cylinder is provided with a connecting hole communicating inside and outside, the upper end of the mixing cylinder is provided with the upper end cover, the central part of the upper end cover is fixedly installed with the sapphire glass cylinder between the connecting hole, the first connecting pipeline is installed on the central part of the upper end cover, the sampling valve is installed on the first connecting pipeline, the lower part of the mixing cylinder is provided with a liquid inlet hole communicating inside and outside, the outer side of the lower part of the mixing cylinder is fixedly and sealingly installed with the first cylinder body, the left end of the first cylinder body is provided with a communicating hole communicating inside and outside, the first cylinder body is provided with the second cylinder body, the second cylinder body is provided with the second piston rod sealingly penetrating through the left end of the second cylinder body, the first piston rod is transmissionally connected with the second piston rod between the right end of the first piston rod and the left end of the second piston rod, the right end of the second cylinder body is provided with the first pressurizing hole and the second pressurizing hole communicating inside and outside, the first pressurizing hole is fixedly communicated with the outlet of the pressurizing assembly, the second connecting pipeline is fixedly communicated between the first connecting pipeline and the second pressurizing hole.

2. The apparatus for measuring gas solubility according to claim 1, wherein The balance kettle further comprises a stirring shaft, stirring blades, a stirring motor, and a magnetic coupler, the stirring shaft is rotationally installed on the upper end of the lower end cover, a plurality of stirring blades are fixedly installed on the outer side of the stirring shaft along the circumference, the stirring motor is arranged below the lower end cover, the output shaft of the stirring motor is transmissionally connected with the stirring shaft through the magnetic coupler, and the outer side of the sapphire glass cylinder is provided with a scale mark layer.

3. The apparatus for measuring the solubility of a gas according to claim 1 or 2, characterized by The balance kettle further comprises a three-way valve and a emptying pipeline, the three-way valve is installed between the first connecting pipeline and the emptying pipeline corresponding to the position between the second connecting pipeline and the upper end cover, the first pressure gauge is installed on the first connecting pipeline corresponding to the position between the three-way valve and the sampling valve, and the liquid inlet valve is installed on the liquid inlet pipeline.

4. The apparatus for measuring gas solubility according to claim 1 or 2, characterized by The pressurizing assembly comprises a pressurizing cylinder, a pressurizing piston rod, a heat preservation box, a gas cylinder, and a second driving mechanism, the pressurizing cylinder, the first cylinder body, the second cylinder body, and the balance kettle are all installed in the heat preservation box, the pressurizing cylinder is provided with the pressurizing piston rod sealingly penetrating through the left end of the pressurizing cylinder, the left end of the pressurizing piston rod is transmissionally connected with the right end of the output shaft of the second driving mechanism, the right end of the pressurizing cylinder is provided with the inlet and the outlet communicating inside and outside, the inlet and the outlet of the gas cylinder are fixedly communicated with the gas inlet pipeline, the gas inlet pipeline is provided with the gas inlet check valve, the gas inlet pipeline is provided with the pressure reducing valve corresponding to the position between the gas inlet check valve and the gas cylinder, the outlet and the first pressurizing hole are fixedly communicated with the gas outlet pipeline, and the gas outlet pipeline is provided with the gas outlet check valve.

5. The apparatus for measuring gas solubility according to claim 3, wherein The pressurizing assembly comprises a booster cylinder, a booster piston rod, a heat preservation box, a gas cylinder and a second driving mechanism, the booster cylinder, the first cylinder, the second cylinder and the balance tank are all installed in the heat preservation box, the booster cylinder is provided with the booster piston rod penetrating through the left end of the booster cylinder and sealed at the left end, the left end of the booster piston rod is in transmission connection with the right end of the output shaft of the second driving mechanism, the right end of the booster cylinder is provided with an inlet and an outlet in communication with the inside and outside of the booster cylinder, the inlet and the outlet of the gas cylinder are fixedly connected with a gas inlet pipeline, the gas inlet pipeline is provided with a gas inlet check valve, the gas inlet pipeline between the gas inlet check valve and the gas cylinder is provided with a pressure reducing valve, the outlet is fixedly connected with a gas outlet pipeline, and the gas outlet pipeline is provided with a gas outlet check valve.

6. The apparatus for measuring gas solubility according to claim 4, wherein The right part of the booster cylinder is provided with a test hole in communication with the inside and outside of the booster cylinder, and a second pressure gauge is fixedly installed on the right part of the booster cylinder corresponding to the position of the test hole.

7. The apparatus for measuring gas solubility according to claim 5, wherein The right part of the booster cylinder is provided with a test hole in communication with the inside and outside of the booster cylinder, and a second pressure gauge is fixedly installed on the right part of the booster cylinder corresponding to the position of the test hole.

8. A method of measuring gas solubility using the measuring device of gas solubility according to any one of claims 4 to 7, characterized by The steps are as follows: S1, open the liquid inlet valve, close the sampling valve, connect the upper end of the sapphire glass cylinder with the first connecting pipeline through the three-way valve, and use the measured gas in the gas cylinder to purge the mixing cylinder, the first cylinder, the second cylinder, the first connecting pipeline, the second connecting pipeline and the liquid inlet pipeline, after the purging is completed, connect the upper end of the sapphire glass cylinder with the emptying pipeline through the three-way valve; S2, start the first driving mechanism, move the left end of the first piston rod to the left end of the first cylinder, and stop the first driving mechanism; S3, introduce the test liquid into the mixing cylinder through the liquid inlet funnel, and close the liquid inlet valve after the test liquid flows out from the end of the emptying pipeline; S4, adjust the temperature of the heat preservation box to the set value; S5, start the second driving mechanism, and after the booster piston rod reciprocates left and right, the measured gas in the gas cylinder is delivered into the second cylinder, when the first pressure gauge reaches the set value, record the volume of the booster cylinder and the second pressure gauge, and stop the second driving mechanism; S6, start the stirring motor to drive the stirring blade to rotate; S7, connect the upper end of the sapphire glass cylinder with the first connecting pipeline through the three-way valve, and the measured gas in the first connecting pipeline enters the mixing cylinder; S8, start the first driving mechanism, and accelerate the dissolution speed of the measured gas in the test liquid when the first piston rod reciprocates left and right; S9, when the first pressure gauge decreases, start the second driving mechanism to restore the first pressure gauge to the set value; S10, repeat steps S8 to S9 until the first pressure gauge is stable, and stop the second driving mechanism; S11, start the first driving mechanism, and after the first piston rod moves to the right, the test liquid is extracted from the mixing cylinder until the gas phase is observed in the sapphire glass cylinder, the volume value is obtained from the scale mark layer, and the volume of the booster cylinder and the second pressure gauge are recorded again; S12, open the sampling valve, sample from the first connecting pipeline, analyze the gas phase composition by gas chromatography, and obtain the volume percentage of the measured gas.

9. The method of measuring gas solubility according to claim 8, wherein The purging process in step S1 is: opening the gas cylinder and adjusting the pressure reducing valve so that the pressure of the gas inlet pipeline is a set value, starting the second driving mechanism, moving the pressurizing piston rod to the left to suck the measured gas from the gas cylinder, moving the pressurizing piston rod to the right to deliver the measured gas in the pressurizing cylinder to the second cylinder, starting the first driving mechanism, reciprocating the first piston rod and the second piston rod, delivering the measured gas in the second cylinder to the first connecting pipeline, the sapphire glass cylinder and the mixing cylinder, and then discharging through the liquid inlet pipeline.

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