Dissolved gas storage device and method for stabilizing output gas

Abstract

The application provides a dissolved gas storage device and a method for stably outputting gas, the device comprising: an air flow control unit, a solvent mixing unit, a solvent separation unit and a temperature control unit. The method comprises the following steps: S1: storing dissolved gas: using the device, adding solvent into the device, controlling temperature, connecting the air inlet pipe of the device to a dissolved gas cylinder, opening the air inlet pressure regulating valve to adjust the pressure to a first pressure, and standing for more than 8 hours; S2: outputting dissolved gas: connecting the air outlet pipe of the device to a device to be used, opening the air outlet pressure regulating valve to adjust the pressure to a second pressure, and making the gas in the dissolved gas cylinder flow into the device to be used after flowing through the device. Through the device and the method, the safety of the storage and use of the dissolved gas can be ensured, the proportion of the dissolved gas in the output gas of the dissolved gas storage device can be kept stable, and the problem that the solvent content in the output gas increases due to the decrease of the cavity pressure in the device with the output of the gas can be avoided.

Description

Technical Field

[0001] This invention relates to a dissolved gas storage and usage technology, and in particular to an apparatus and method for maintaining a stable proportion of dissolved gas in the output gas during the use of dissolved gas. Background Technology

[0002] Dissolved gases refer to gases that are stored and transported dissolved in a liquid solvent. A common example is acetylene dissolved in acetone, which is classified as a Class 2 hazardous gas. Taking dissolved acetylene as an example, to ensure safe transportation and storage, gaseous acetylene is compressed and dissolved in a liquid solvent (usually acetone) during the production process. This liquid solvent is then filled into special steel cylinders filled with porous packing material. When used, the acetylene gas spontaneously releases from the solvent; this type of acetylene is called "dissolved acetylene." Acetylene is a relatively reactive gas that rapidly polymerizes under high temperatures (above 300°C) or pressure, with the released heat driving the reaction forward. This process can easily lead to a rapid and large accumulation of heat, potentially causing an explosion that endangers personal safety and property. Dissolving acetylene in a liquid solvent for storage, transportation, and use significantly improves the safety of the gas. However, the solubility of acetylene in liquid solvents changes with temperature and pressure (see GB13591-2009, Regulations for Filling Dissolved Acetylene Cylinders), and the content of liquid solvent volatilized in the output gas gradually increases as the cylinder pressure decreases, and also varies with the ambient temperature of the cylinder. This phenomenon has a serious impact on scientific research and production activities with high gas stability requirements (such as CVD growth processes using dissolved acetylene as a carbon source).

[0003] Chinese utility model patent document CN206159814U discloses a novel pressure vessel for dissolving acetylene, comprising an outer shell, an inner shell, a reinforcing structure, a corrosion-resistant inner layer, and a control valve. The outer shell contains the reinforcing structure, the inner shell, and the corrosion-resistant inner layer in sequence. Anti-collision strips are symmetrically arranged on the upper and lower parts of the outer shell. A bottle neck shell extends through the upper end of the outer shell. The bottle neck shell contains, in sequence, an outlet pipe, an inner shell, an extension of the inner shell, a sealing gasket, a control valve, and a leak-proof gasket. A sealing ring is embedded in the lower outer periphery of the control valve, and a knob is welded to the upper end of the control valve. However, the aforementioned related technologies do not solve the problem of unstable acetylene gas content in the output gas during use. Therefore, there is an urgent need to develop a technology that can ensure the stability of the gas output from the dissolved gas storage device. Summary of the Invention

[0004] The present invention aims to solve the problems existing in related technologies and provides a dissolved gas stabilizing device. By limiting the pressure and temperature to a small range, the solvent content in the output gas is stabilized within a certain range, unaffected by pressure fluctuations of the dissolved gas storage device itself or changes in external ambient temperature, thus maximizing the stability of the gas output from the dissolved gas storage device.

[0005] To address the limitations of the aforementioned related technologies, this invention proposes a dissolved gas storage device and a method for stabilizing the proportion of dissolved gas in the output gas of the device.

[0006] In a first aspect, the present invention provides a dissolved gas storage device, comprising:

[0007] Airflow control unit: used to store dissolved gas or output gas containing dissolved gas, and to maintain the internal pressure of the dissolved gas storage device at P, where P is selected from 0.1-1.0 MPa;

[0008] Solvent mixing unit: used to contain solvent and control the weight of solvent, so that the dissolved gas flowing into the solvent mixing unit is fully mixed with the solvent;

[0009] Solvent separation unit: Used to separate solvent from the gas flowing out of the solvent mixing unit. The difference between the solvent content in the gas flowing out of the solvent separation unit and the preset target value is less than or equal to 10%.

[0010] Temperature control unit: controls the internal temperature of the dissolved gas storage device to T±1.0℃, where T is selected from -20℃~30℃;

[0011] The dissolved gas content in the gas output from the dissolved gas storage device is C ± 1%, where C is selected from 80% to 98%.

[0012] Furthermore: the airflow control unit includes an inlet pressure regulating valve, an outlet pressure regulating valve, an outlet pipe, and an inlet pipe;

[0013] The inlet pressure regulating valve is installed on the inlet pipe of the device to regulate the pressure of the gas entering the dissolved gas storage device.

[0014] The gas pressure regulating valve is installed on the gas outlet pipe of the device to regulate the pressure of the gas output by the dissolved gas storage device.

[0015] Furthermore, the solvent mixing unit includes: a solvent adding valve, a solvent discharging valve, a porous packing material, a weight detection device, and a porous nozzle;

[0016] The solvent mixing unit is disposed at the lower part of the dissolved gas storage device, and the porous packing abuts against the bottom of the inner cavity of the dissolved gas storage device; the solvent is contained in the porous packing, and / or the solvent is contained in the gap between the porous packing and the bottom of the inner cavity;

[0017] The porous nozzle is positioned above the bottom of the inner cavity, extending into the porous packing and parallel to the bottom of the inner cavity. The height of the porous nozzle relative to the bottom of the inner cavity is 0-h / 2. The porous nozzle is connected to the air inlet pipe of the device. Gas passing through the air inlet pipe of the device is ejected from the porous nozzle, passes through the pores of the porous packing, and flows out from above the porous packing. The upper edge of the porous packing is at a height of h relative to the bottom of the inner cavity.

[0018] The solvent addition valve is connected to the solvent mixing unit and is positioned above the surface of the solvent liquid to control the entry of solvent into the solvent mixing unit.

[0019] The solvent discharge valve is connected to the bottom of the solvent mixing unit to control the solvent to be discharged from the solvent mixing unit;

[0020] The weight detection device is used to detect the weight of the solvent in the dissolved gas storage device.

[0021] Furthermore: the dissolved gas is acetylene;

[0022] The solvent is acetone or DMF;

[0023] The solvent separation unit is provided with a separation structure, which is a gas path grid. The pore size of the gas path grid is 0.1-0.5 mm. The gas path grid is a layered structure, with adjacent upper and lower layers placed in an alternating manner with staggered pore positions, and the gap between the layers is 20 mm-50 mm.

[0024] Alternatively, the separation structure may be a multi-layer pleated filter element or a powder filter element, wherein the filtration accuracy of the multi-layer pleated filter element or the powder filter element is less than or equal to 5 micrometers.

[0025] Furthermore, the temperature control unit includes: a medium passage, a medium inlet, a medium outlet, and a medium cooling unit;

[0026] The cavity shell of the dissolved gas storage device has a double-layered hollow structure, with the hollow portion serving as the medium passage and the outer layer acting as the outer wall of the cavity.

[0027] The cooling medium is cooled in the medium cooling unit; the cooling medium flows from the medium cooling unit into the medium passage through the medium inlet, and flows from the medium passage into the medium cooling unit through the medium outlet.

[0028] Furthermore: the cooling medium is water, the medium passage is a cavity water jacket, and the medium cooling unit is a constant temperature chiller.

[0029] Secondly, the present invention provides a method for stabilizing the proportion of dissolved gas in the output gas of a dissolved gas storage device, comprising the following steps:

[0030] S1: Dissolved gas storage: Using the apparatus described in the first aspect, add solvent to the apparatus, turn on the temperature control unit to control the temperature at T ± 1.0℃, where T is selected from -20℃ to 30℃; close the inlet pressure regulating valve and the outlet pressure regulating valve, and slowly adjust the inlet pressure regulating valve so that the volumetric flow rate of the dissolved gas entering the inlet pipe of the apparatus is less than the first flow rate; after the pressure of the inlet pressure regulating valve stabilizes at the first pressure, let it stand for more than 8 hours.

[0031] S2: Output dissolved gas: Connect the gas outlet pipe of the device to the equipment where dissolved gas is to be used, open the gas outlet pressure regulating valve and adjust the pressure to the second pressure. The gas containing dissolved gas flows into the equipment where dissolved gas is to be used through the gas outlet pressure regulating valve.

[0032] Furthermore: the dissolved gas is acetylene;

[0033] The first flow velocity is 0.015 m. 3 / (h·L); the first pressure is selected from 0.1-1.0MPa; the second pressure is selected from 0.001-0.1MPa.

[0034] Further: In step S1, the dissolved gas enters the solvent at the bottom of the cavity through the device inlet pipe, inlet pressure regulating valve, and multi-hole nozzle. After mixing with the solvent, it passes through the multi-hole packing and flows out from above the multi-hole packing. The gas flowing out from above the multi-hole packing is a gas containing dissolved gas. The gas containing dissolved gas then passes through the gas path grid and is stored in the device. The dissolved gas in the storage is in a gaseous state and in a state of being dissolved in the solvent.

[0035] In step S2, the gas containing dissolved gas flows through the gas outlet pipe of the device into the equipment where the dissolved gas is to be used.

[0036] Furthermore: if the weight detection device detects that the solvent weight is less than the preset lower threshold, the solvent adding valve is opened to add solvent until the solvent weight is greater than or equal to the lower threshold;

[0037] If the weight detection device detects that the solvent weight is greater than the preset threshold, the solvent discharge valve is opened to discharge the solvent until the solvent weight is less than or equal to the threshold.

[0038] Compared with related technologies, the present invention has the following advantages:

[0039] The first aspect of this invention provides a dissolved gas storage device. By setting an airflow control unit to maintain the internal pressure of the device within a certain range, and by setting a temperature control unit to control the internal temperature of the storage device within a certain range, changes in the solubility of the dissolved gas in the liquid solvent due to pressure and temperature variations are avoided, ensuring the safe storage and use of the dissolved gas. At the same time, the solubility remains constant, making it easy to control the proportion of dissolved gas in the output gas. On this basis, by setting a solvent mixing unit and a solvent separation unit, the dissolved gas is fully mixed with the solvent in the solvent mixing unit, ensuring that the dissolved gas carries sufficient solvent. Then, the solvent separation unit separates excess solvent from the mixed gas. Under the combined effect of the above mechanisms, the dissolved gas is prevented from carrying too much or too little solvent, thereby ensuring the stability of the proportion of dissolved gas in the output gas.

[0040] The second aspect of this invention provides a method for stabilizing the proportion of dissolved gas in the output gas of a dissolved gas storage device. By using the aforementioned device and the steps of the method, and by controlling the internal pressure and temperature of the dissolved gas storage device, the safe storage and use of the dissolved gas is ensured, while the solubility remains unchanged. This makes it easy to control the proportion of dissolved gas in the output gas. Furthermore, after the dissolved gas is fully mixed with the solvent in the solvent mixing unit, it carries sufficient solvent. Then, the excess solvent in the mixed gas is separated by the solvent separation unit. Under the combined effect of the above mechanisms, it is avoided that the dissolved gas carries too much or too little solvent, thereby ensuring the stability of the proportion of dissolved gas in the output gas. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a dissolved gas storage device provided in one embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Outer wall of the cavity

[0044] 2-Media Path

[0045] 3-Medium Cooling Unit

[0046] 4-Media Inlet

[0047] 5-Media Outlet

[0048] 6-Inlet pipe of the device

[0049] 7-Intake pressure regulating valve

[0050] 8-Multi-hole nozzle

[0051] 9-Porous packing

[0052] 10-Solvent Addition Valve

[0053] 11- Solvent Discharge Valve

[0054] 12-Air Path Grille

[0055] 13- Device outlet pipe

[0056] 14-Outlet pressure regulating valve

[0057] 15-Weight Detection Device Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below. However, it should be understood that the description herein is merely illustrative and not intended to limit the scope of the invention.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. All characterization techniques mentioned herein can be found in relevant descriptions in the prior art, and will not be repeated here.

[0060] To further understand the present invention, the present invention will be described in detail below with reference to the preferred embodiments.

[0061] Example 1

[0062] like Figure 1 As shown, a dissolved gas storage device includes:

[0063] Airflow control unit: used to store dissolved gas or output gas containing dissolved gas, and to maintain the internal pressure of the dissolved gas storage device at P, where P is selected from 0.1-1.0 MPa;

[0064] Solvent mixing unit: used to contain solvent and control the weight of solvent, so that the dissolved gas flowing into the solvent mixing unit is fully mixed with the solvent;

[0065] Solvent separation unit: used to separate the solvent component from the gas flowing out of the solvent mixing unit. The difference between the solvent content in the gas flowing out of the solvent separation unit and a preset target value is less than or equal to 10%. The preset target value is calculated based on a target value for the proportion of dissolved gas in the output gas.

[0066] Temperature control unit: controls the internal temperature of the dissolved gas storage device to T±1℃, where T is selected from -20℃~30℃;

[0067] The dissolved gas proportion in the output gas of the dissolved gas storage device is C ± 1%, where C is selected from 80% to 98%.

[0068] P is selected from 0.1-1.0 MPa, for example, it can be 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1 MPa. The present invention is not limited to the above values, and other values ​​listed above are also applicable.

[0069] The preset target value is used to control the solvent content carried in the gas. Preset target value = 1 - the proportion of dissolved gas in the gas output from the dissolved gas storage device; the difference between the solvent content in the gas flowing out of the solvent separation unit and the preset target value is set to be less than or equal to 10%, for example, the difference between the solvent content and the preset target value is 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc. This invention is not limited to the above values; other unlisted values ​​within the above range are also applicable.

[0070] The dissolved gas is the effective component in the gas output from the device, such as an organic gas that is needed for combustion, chemical synthesis, etc., like acetylene or other organic gases that are gaseous at room temperature. The solvent can be a common nonpolar solvent such as acetone.

[0071] Preferably, the dissolved gas is acetylene.

[0072] Taking acetylene as a dissolved gas as an example, the acetylene-containing gas is thoroughly mixed with the solvent in a solvent mixing unit, and then separated by a solvent separation unit. During this process, it continuously mixes with the solvent gas in the cavity space, thereby separating excess solvent carried over. The combination of these processes ensures a stable acetylene content in the output gas. Therefore, the main purpose of the acetylene gas flowing out of the solvent separation unit is to separate excess solvent carried over. After this step, the acetylene gas content should be close to the target value of the acetylene content in the final output gas. The deviation of the solvent content in the gas flowing out of the solvent separation unit from the preset target value is controlled to be less than or equal to 10%. This ensures that the acetylene content in the output gas meets the target value after passing through the uppermost part of the cavity space. This invention is not limited to the aforementioned dissolved gas acetylene; similarly, it can also be applied to other dissolved gases dissolved in solvents.

[0073] For example, when the dissolved gas ratio X in the output gas is set within the range of 80%-98%, the preset target value is 20%-2%, and the deviation is controlled within 10%, that is, 2%-0.2%, which ensures the stability of the dissolved gas ratio in the output gas.

[0074] Preferably, the deviation is controlled to be less than or equal to 5%, that is, 1%-0.1%.

[0075] The T is selected from -20℃ to 30℃, and can be, for example, -20℃, -19℃, -18℃, -17℃, -16℃, -15℃, -14℃, -13℃, -12℃, -11℃, -10℃, -9℃, -8℃, -7℃, -6℃, -5℃, -4℃, -3℃, -2℃, -1℃, 0℃, 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃, 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃, 24℃, 25℃, 26℃, 27℃, 28℃, 29℃, 30℃, etc. The present invention is not limited to the above values, and other unlisted values ​​within the above range are also applicable. When in use, the temperature is set to a value within the range of -20℃ to 30℃. The device of the present invention can maintain a control accuracy of ±1.0℃ for the set temperature value.

[0076] The proportion C of dissolved gas in the output gas is selected from 80% to 98%, for example, it can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, etc. This invention is not limited to the above values; other unlisted values ​​within the above range are also applicable. In use, the proportion of dissolved gas in the output gas can be set to a value within the range of 80% to 98%, and the device of this invention can maintain a control accuracy of ±1% of the set value.

[0077] Taking acetylene gas dissolution as an example, as shown in Table 1, according to GB13591-2009, the filling regulations for dissolved acetylene gas cylinders, the solubility of acetylene gas changes with temperature and pressure. By setting up an airflow control unit to control the internal pressure of the device and setting up a temperature control unit to control the internal temperature of the device, the change in the solubility of acetylene gas due to pressure and temperature changes is avoided, that is, the solvent content in the output gas is stabilized.

[0078] Table 1. Gravimetric solubility of acetylene in acetone (unit: kg / kg)

[0079]

[0080]

[0081] Within the pressure setting range of this device, no handling or other actions are required during use, and the temperature is controlled within a low range. Therefore, the safety of acetylene during use can be guaranteed, and polymerization and explosion of acetylene can be avoided.

[0082] Preferably, the solvent separation unit can employ separation methods such as gas path grid, multi-layer pleated filter element, or powder filter element;

[0083] Most preferably, the solvent separation unit uses a gas path grid;

[0084] The filtration accuracy of the multi-layer pleated filter element or powder filter element is less than or equal to 5 micrometers, and it can be made of metal or polymer fiber.

[0085] Furthermore: the airflow control unit includes an inlet pressure regulating valve 7, an outlet pressure regulating valve 14, an outlet pipe 13, and an inlet pipe 6;

[0086] The inlet pressure regulating valve 7 is installed on the inlet pipe 6 of the device to regulate the pressure of the gas entering the dissolved gas storage device; the inlet pressure regulating valve 7 regulates the inlet pressure of the inlet pipe 6 of the device.

[0087] The outlet pressure regulating valve 14 is installed on the outlet pipe 13 of the device to regulate the pressure of the gas output from the dissolved gas storage device. The outlet pressure regulating valve 14 regulates the outlet pressure of the outlet pipe 13 of the device.

[0088] Further: The solvent mixing unit includes: a solvent adding valve 10, a solvent discharging valve 11, a porous packing 9, a weight detection device 15, and a porous nozzle 8;

[0089] The solvent mixing unit is disposed at the lower part of the dissolved gas storage device, and the porous packing 9 abuts against the bottom of the inner cavity of the dissolved gas storage device; the solvent is contained in the porous packing 9, and / or the solvent is contained in the gap between the porous packing 9 and the bottom of the inner cavity;

[0090] The porous nozzle 8 is positioned above the bottom of the inner cavity, extending into the porous packing 9 and parallel to the bottom of the inner cavity. The position of the porous nozzle 8 relative to the bottom of the inner cavity is at a height of 0-h / 2. The porous nozzle is connected to the air inlet pipe of the device. Gas passing through the air inlet pipe 6 is ejected from the porous nozzle 8, passes through the pores of the porous packing 9, and flows out from above the porous packing 9. The upper edge of the porous packing 9 is at a height of h relative to the bottom of the inner cavity (e.g., ...). Figure 1 (as shown);

[0091] The solvent addition valve 10 controls the entry of solvent into the solvent mixing unit;

[0092] The solvent discharge valve 11 controls the discharge of solvent from the solvent mixing unit;

[0093] The weight detection device 15 is used to detect the weight of the solvent in the dissolved gas storage device.

[0094] The dissolved gas ejected through the porous nozzle 8 is fully mixed with the solvent in the porous packing 9, which ensures that the solvent content carried in the output gas is stable, thereby ensuring that the dissolved gas content in the output gas is stable.

[0095] The function of porous packing is to ensure thorough mixing of dissolved gas and solvent, accelerating the dissolution process. When the dissolved gas reaches its saturation point, it can no longer dissolve in the solvent. However, as the pressure decreases (gas output from the upper part), dissolved gas overflows from the solvent and enters the upper space, increasing the pressure. The newly entering dissolved gas then continues to dissolve in the solvent, and this process repeats.

[0096] Further: the solvent is acetone or DMF; the solvent separation unit is a gas path grid 12, the pore size of the gas path grid 12 is 0.1-0.5mm, the gas path grid 12 has a layered structure, and adjacent upper and lower layers are placed in an alternating manner with staggered pore positions, and the gap between layers is 20-50mm.

[0097] Alternatively, the separation structure may be a multi-layer pleated filter element or a powder filter element, wherein the filtration accuracy of the multi-layer pleated filter element or the powder filter element is less than or equal to 5 micrometers.

[0098] Preferably, the solvent is acetone.

[0099] The DMF refers to N,N-dimethylformamide.

[0100] The total length of the gas path in the gas passage grille 12 is greater than or equal to 500cm, for example, 500cm, 1000cm, 1500cm, 2000cm, 2500cm, 3000cm, 3500cm, 4000cm, 4500cm, 5000cm, 6000cm, 7000cm, etc. This invention is not limited to the above values; other unlisted values ​​within the above range are also applicable. The gas path is the shortest path through which gas flows from the gas passage grille 12 to the gas passage grille 12.

[0101] The function of the gas path grille 12 is to lengthen the flow path of the acetylene gas in the device. Gases carrying more solvent when dissolving from the solvent solution undergo prolonged flow through the gas path grille 12, gradually separating excess solvent from the gas. Conversely, gases carrying less solvent when dissolving from the solvent solution gradually draw solvent from other gases during the same prolonged flow through the gas path grille 12. These two mechanisms ensure the stability of the acetylene content in the output gas. Simultaneously, the gas path grille 12 also has a small condensation effect, allowing excess solvent to flow back.

[0102] The principle of selective gas separation using a grid structure is as follows: smaller gas molecules pass through the grid more easily, while larger gas molecules do not. Polar gas molecules readily interact with polar groups on the grid surface and are thus adsorbed onto the grid structure surface. By adjusting the pore size and surface chemical properties of the grid's porous material, effective separation of excess solvent from acetylene gas can be achieved, thereby controlling the solvent and acetylene content within a stable preset range. The gas path grid 12 of this invention can achieve a separation efficiency of over 98% for excess solvent.

[0103] The gas passage grille 12 can be made of materials with strong chemical stability, such as glass, ceramics, polymers, or metal-organic frameworks, and can not react with dissolved gases or solvents. The structure of the gas passage grille 12 can be a plate grille or a membrane grille.

[0104] The gas path grille 12 is made of a smooth, chemically stable material that does not easily adsorb acetone droplets. The grille has a pore size of 0.1–0.5 mm and a layered structure. To prevent direct gas penetration, the pores in the upper and lower layers are staggered, maximizing the gas flow path. The gap between the gas path grille layers is 20–50 mm. The gaps between layers should not be too large, as this would reduce the total number of layers and pose a safety hazard. The pore size of the gas path grille 12 is 0.1–0.5 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. This invention is not limited to these values; other unlisted values ​​within the above range are also applicable.

[0105] The gap between the 12 layers of the air passage grille is 20-50mm, for example, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 35mm, 40mm, 50mm, etc. The present invention is not limited to the above values, and other unlisted values ​​within the above range are also applicable.

[0106] As the solvent passes through the gas path grille 12 or the multi-layer pleated filter element, it continuously mixes with the solvent gas in the cavity space. The gas path grille 12 or the multi-layer pleated filter element is placed in the cavity space, and its gas path (pore channel) is connected to the cavity space (gas can flow between them), so it can be fully mixed with the solvent gas in the cavity space.

[0107] Similarly, when the separation structure uses a powder filter element, the powder filter element continuously mixes with the solvent gas in its internal space, and its internal space is connected to the cavity space (the gas can flow between them).

[0108] Furthermore: the temperature control unit includes: a medium passage 2, a medium inlet 4, a medium outlet 5, and a medium cooling unit 3;

[0109] The dissolved gas storage device has an outer wall 1 of the cavity, and the medium passage 2 is disposed inside the outer wall 1 of the cavity.

[0110] The cooling medium is cooled in the medium cooling unit 3; the cooling medium flows from the medium cooling unit 3 into the medium passage 2 through the medium inlet 4, and flows from the medium passage 2 into the medium cooling unit 3 through the medium outlet 5.

[0111] The medium passage 2, medium inlet 4, medium outlet 5, and medium cooling unit 3 form a continuously circulating cooling loop, thereby keeping the temperature inside the device constant.

[0112] The device has an inner wall of the cavity and an outer wall of the cavity. The medium passage 2 is a gap formed between the inner wall of the cavity and the outer wall of the cavity, that is, the medium passage 2 covers the area of ​​the inner side of the outer wall of the cavity.

[0113] Alternatively, the device has an outer wall of the cavity, and the medium passage 2 is disposed on the inner side of the outer wall of the cavity. The medium passage 2 is a network of pipes, and the area of ​​the network covering the outer wall of the cavity is less than or equal to the total area of ​​the inner side of the outer wall of the cavity.

[0114] Preferably, the cooling medium is a liquid or a gas, including but not limited to air, water, oil, ethylene glycol solution, etc.; the cooling medium needs to be a non-corrosive medium to avoid damage to the metal cavity.

[0115] Most preferably, the cooling medium is water.

[0116] When the cooling medium is water, the value of T ranges from 0 to 30°C.

[0117] Preferably, the medium passage 2 is a whole-body cooling system, with a medium cooling jacket sandwiched between the inner and outer walls of the cavity covering the entire cavity, or the medium passage 2 is partially covered by a structure such as a pipe that allows the cooling medium to flow through it.

[0118] Most preferably, the medium passage 2 is cooled as a whole;

[0119] Furthermore: the cooling medium is water, the medium passage 2 is a cavity water jacket, and the medium cooling unit 3 is a constant temperature chiller.

[0120] The device of this invention maintains the internal pressure within a certain range by setting an airflow control unit and the temperature within a certain range by setting a temperature control unit. This avoids changes in the solubility of dissolved gases due to pressure and temperature variations, stabilizing the proportion of dissolved gases in the output gas and ensuring the safe storage and use of the dissolved gases. A solvent mixing unit ensures thorough mixing of the dissolved gas and solvent, and a solvent separation unit separates excess solvent from the mixed gas. Simultaneously, the dissolved gas and the gas in the cavity containing the solvent separation unit are continuously and uniformly mixed. Through the combination of these mechanisms, the proportion of dissolved gases in the output gas remains consistently stable. The device of this invention regulates the proportion of dissolved gases in the output gas by adjusting pressure and temperature; through these settings, the proportion of dissolved gases in the output gas remains consistently stable.

[0121] Example 2

[0122] like Figure 1 As shown, a method for stabilizing the proportion of dissolved gas in the output gas of a dissolved gas storage device includes the following steps:

[0123] S1: Dissolved gas storage: Using the device described above, add solvent to the device, turn on the temperature control unit to control the temperature at T ± 1.0℃, where T is selected from -20℃ to 30℃; close the inlet pressure regulating valve 7 and the outlet pressure regulating valve 14, and slowly adjust the inlet pressure regulating valve 7 so that the volumetric flow rate of the dissolved gas entering the inlet pipe 6 of the device is less than the first flow rate; after the pressure of the inlet pressure regulating valve 7 stabilizes at the first pressure, let it stand for more than 8 hours.

[0124] S2: Output dissolved gas: Connect the gas outlet pipe 13 of the device to the equipment where dissolved gas is to be used, open the gas outlet pressure regulating valve 14 to adjust the pressure to the second pressure, and the gas containing dissolved gas flows into the equipment where dissolved gas is to be used through the gas outlet pressure regulating valve 14.

[0125] In step S1, the pressure of the inlet pressure regulating valve 7 is stabilized at the first pressure. At this time, the internal pressure of the dissolved gas storage device also reaches 0.2 MPa, and the internal and external pressures are balanced. Under the condition that the inlet pressure regulating valve 7 maintains this pressure, the device is left to stand for more than 8 hours.

[0126] In step S2, the outlet pressure regulating valve 14 is opened to adjust the pressure to the second pressure. The inlet pressure is fixed at a certain value by the inlet pressure regulating valve 7, and the outlet pressure is controlled at the minimum value by the outlet pressure regulating valve 14 (to meet the minimum pressure required for subsequent use flow rate). This keeps the internal pressure of the device basically constant and avoids the impact caused by pressure fluctuations.

[0127] The T is selected from -20℃ to 30℃, and can be, for example, -20℃, -19℃, -18℃, -17℃, -16℃, -15℃, -14℃, -13℃, -12℃, -11℃, -10℃, -9℃, -8℃, -7℃, -6℃, -5℃, -4℃, -3℃, -2℃, -1℃, 0℃, 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃, 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃, 24℃, 25℃, 26℃, 27℃, 28℃, 29℃, or 30℃. This invention is not limited to the above values, and other unlisted values ​​within the above range are also applicable. When in use, the temperature is set to a temperature value within the above-mentioned temperature range, and the control accuracy of the device of the present invention is ±1.0℃.

[0128] Preferably, the first pressure is selected from 0.1-1.0 MPa; the second pressure is selected from 0.001-0.1 MPa.

[0129] Most preferably, the first pressure is 0.2 MPa.

[0130] Preferably, in step S1, the device is left to stand for more than 8 hours, such as 8 hours, 9 hours, 10 hours, etc.; the present invention is not limited to the above values, and other unlisted values ​​within the above range are also applicable.

[0131] Unit volume flow rate refers to the volume of gas injected per hour per liter of storage device volume. This ratio is used to control the filling speed to ensure the safety of the filling process.

[0132] Furthermore: the first flow velocity is 0.015 m 3 / h·L; the first pressure is selected from 0.1-1.0MPa, for example, it can be 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1MPa, etc. The present invention is not limited to the above values, and other unlisted values ​​within the above value range are also applicable.

[0133] The first flow rate is a safety threshold, meaning that the volume of gas added per liter of storage device volume per hour should not exceed 0.015 cubic meters. This limit helps reduce potential risks during the filling process, such as excessively rapid filling speeds that could cause gas temperatures to rise, increasing the risk of explosion. By limiting the flow rate of the filling volume, the filling speed of the gas within the storage device can be controlled, thereby reducing the heat of compression of the gas during filling, preventing excessively high temperatures within the storage device, and ensuring the safety of the filling process.

[0134] The second pressure is selected from 0.001-0.1 MPa, for example, it can be 0.001 MPa, 0.005 MPa, 0.01 MPa, 0.02 MPa, 0.03 MPa, 0.05 MPa, 0.06 MPa, 0.07 MPa, 0.08 MPa, 0.09 MPa, 0.1 MPa, etc. The present invention is not limited to the above values, and other unlisted values ​​within the above range are also applicable.

[0135] Further: In step S1, the dissolved gas enters the solvent at the bottom of the cavity through the device inlet pipe 6, the inlet pressure regulating valve 7, and the porous nozzle 8. After mixing with the solvent, it passes through the porous packing 9 and flows out from above the porous packing 9. The gas flowing out from above the porous packing 9 is a gas containing dissolved gas. The gas containing dissolved gas then passes through the gas path grid 12 and is stored in the device. The dissolved gas in the storage is in a gaseous state and in a state of being dissolved in the solvent.

[0136] The gas flowing out from above the porous packing 9 after the dissolved gas is mixed with the solvent contains the solvent, therefore it is a gas containing dissolved gas;

[0137] In step S2, the gas containing dissolved gas flows into the equipment containing dissolved gas to be used through the gas outlet pipe 13.

[0138] When the internal pressure of the device is high, the solvent content in the output dissolved gas is lower. Therefore, by allowing the gas to flow through the porous packing 9 and the solvent (usually acetone solution), the solvent in the gas is replenished. Then, the excess solvent is separated by the cavity space and the gas path grid 12, and the dissolved gas and gaseous solvent are fully mixed, thereby keeping the composition of the outflowing dissolved gas stable. The cavity space is the space in the inner cavity of the device excluding the solvent mixing unit, and the gas path grid 12 basically fills the cavity space. The volume of the cavity space is not less than 30L, for example, including but not limited to 30L, 31L, 32L, 33L, 34L, 35L, 36L, etc., to ensure the effect of stable dissolved gas content in the output gas.

[0139] In step S2, by opening the outlet pressure regulating valve 14 and adjusting the pressure to the second pressure, the pressure of the outlet pressure regulating valve 14 is kept at the minimum pressure required to meet the subsequent usage flow rate. This reduces the impact of pressure changes on the downstream equipment side on the device of the present invention. The second pressure is the minimum pressure required to adjust the outlet pressure of the outlet pressure regulating valve 14 to meet the usage flow rate of the downstream equipment.

[0140] Further: If the weight detection device 15 detects that the solvent weight is less than the preset lower threshold, the solvent addition valve 10 is opened to add solvent until the solvent weight is greater than or equal to the lower threshold.

[0141] If the weight detection device 15 detects that the solvent weight is greater than the preset threshold upper limit, it opens the solvent discharge valve 11 to discharge the solvent until the solvent weight is less than or equal to the threshold upper limit.

[0142] The lower threshold is 8-14 kg; the upper threshold is 9-15 kg. Factors to consider when selecting the threshold are: ① Bottle volume: the larger the bottle and the more solvent, the larger the upper and lower thresholds should be selected; ② Dissolved gas flow rate during use: the higher the dissolved gas flow rate and the more solvent, the larger the upper and lower thresholds should be selected.

[0143] The lower limit of the threshold is 8-14Kg, for example, it can be 8Kg, 9Kg, 10Kg, 11Kg, 12Kg, 13Kg, or 14Kg. This invention is not limited to the above values, and other values ​​listed above are also applicable.

[0144] The upper limit of the threshold is 9-15Kg, for example, it can be 9Kg, 10Kg, 11Kg, 12Kg, 13Kg, 14Kg, 15Kg. The present invention is not limited to the above values, and other values ​​listed above are also applicable.

[0145] When selecting the upper and lower limits of the threshold, the lower limit of the threshold should be less than the upper limit of the threshold.

[0146] The method for detecting the weight of the device of the present invention and estimating solvent loss is as follows:

[0147] Method 1: Before starting, read the bottle weight. After pouring in the solvent, compare the bottle weight with the reading to determine the amount of solvent added. After preparation, let it stand for at least 8 hours, then read the bottle weight again. After use, read the bottle weight again under the same pressure. Comparing the changes before and after will determine the difference in solvent content.

[0148] or,

[0149] Method 2: Before starting, read the cylinder weight; this is the tare weight of the cylinder. After use, read the cylinder weight again and subtract it from the tare weight to obtain the weight of the dissolved gas (acetylene) plus the solvent. Use the temperature and pressure to find the solubility of the dissolved gas (acetylene) in the solvent, and calculate the remaining solvent weight. This method ignores the weight of gaseous acetylene inside the cylinder chamber.

[0150] During normal use, the solvent will be gradually consumed, so it will be necessary to replenish the solvent when it is consumed to a certain extent. The above-mentioned solvent replenishment operation is used to replenish the solvent. When the preset threshold is changed or the filling error causes the solvent to be excessive, the solvent needs to be released to adjust the amount of solvent to an appropriate range. The above-mentioned solvent release operation is used to release the solvent.

[0151] When adding or releasing solvent, use must be paused and the previous preparation work, step S1 (standing for more than 8 hours), must be repeated.

[0152] The present invention provides a method for stabilizing the proportion of dissolved gas in an output gas. When used with acetylene gas, the internal pressure and temperature of the dissolved gas storage device can be controlled by using the above-mentioned device. After the acetylene and solvent are fully mixed, excess solvent in the acetylene gas is separated, thereby ensuring the safety of acetylene storage and the stability of the acetylene content in the output gas.

[0153] Experimental example:

[0154] Preparation steps (acetylene storage): First, add an appropriate amount of acetone solution to the bottom of the device through solvent addition valve 10. Turn on the constant temperature chiller and wait for the water temperature to reach the set value. Connect the device's inlet pipe 6 to the dissolved gas storage device. Close the inlet pressure regulating valve 7 and the outlet pressure regulating valve 14. Slowly adjust the inlet pressure regulating valve 7 to ensure that the volumetric flow rate of acetylene entering the device is less than 0.015 m³ / s. 3 / (h·L), after the air pressure at the outlet of the inlet pressure regulating valve 7 stabilizes at 0.2MPa, let it stand for more than 8 hours before it can be used.

[0155] Operating Procedures (Acetylene Output): Connect the device's outlet pipe 13 to the downstream equipment. Open the outlet pressure regulating valve 14 and adjust the pressure to 0.001 MPa (the minimum pressure required for subsequent usage flow). The acetylene gas in this device enters the acetone solution at the bottom of the chamber through the device's inlet pipe 6, inlet pressure regulating valve 7, and multi-hole nozzle 8. It then flows into the device's outlet pipe 13 through the multi-hole packing 9 and gas path grid 12, and finally into the downstream equipment through the outlet pressure regulating valve 14.

[0156] After a period of use, the weight of the device of the present invention is weighed by the weight detection device 15. When too much acetone is consumed, the displayed weight is reduced to below the lower threshold limit. At this time, acetone is added through the solvent addition valve 10. When too much acetone is consumed, the displayed weight exceeds the upper threshold limit. The excess acetone is released through the solvent release valve 11. The threshold is set to 9-10KG.

[0157] The acetylene content in the output gas was set to 85.2%. After observation, the standard deviation of the acetylene content was 86.5% after 900 minutes of output.

[0158] In embodiments of the present invention, the apparatus and method of the present invention are used for acetylene gas, and the solvent used is acetone. It is understood that the apparatus and method are not limited to the above-mentioned dissolved gas and solvent, and can also be used for the storage and use of other gases to which the inventive concept of the present invention applies.

[0159] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dissolved gas storage device, characterized in that, include: Airflow control unit: used to store dissolved gas and output gas containing dissolved gas, and to maintain the internal pressure of the dissolved gas storage device at P, where P is selected from 0.1-1.0 MPa; Solvent mixing unit: used to contain solvent and control the weight of solvent, so that the dissolved gas flowing into the solvent mixing unit is fully mixed with the solvent; Solvent separation unit: Used to separate the solvent from the gas flowing out of the solvent mixing unit. The difference between the solvent content in the gas flowing out of the solvent separation unit and the preset target value is less than or equal to 10%. Temperature control unit: controls the internal temperature of the dissolved gas storage device to T±1.0℃, where T is selected from -20℃ to 30℃; The dissolved gas content in the gas output from the dissolved gas storage device is C±1%, where C is selected from 80%-98%. The airflow control unit includes an inlet pressure regulating valve (7), an outlet pressure regulating valve (14), a device outlet pipe (13), and a device inlet pipe (6). The solvent mixing unit includes: a solvent adding valve (10), a solvent discharging valve (11), a porous packing (9), a weight detection device (15), and a porous nozzle (8); The solvent mixing unit is disposed at the lower part of the dissolved gas storage device, and the porous packing (9) abuts against the bottom of the inner cavity of the dissolved gas storage device; the solvent is contained in the porous packing (9), and / or the solvent is contained in the gap between the porous packing (9) and the bottom of the inner cavity; The porous nozzle (8) is positioned above the bottom of the inner cavity, extending into the porous packing (9) and parallel to the bottom of the inner cavity. The position of the porous nozzle (8) relative to the bottom of the inner cavity is 0-h / 2. The porous nozzle (8) is connected to the air inlet pipe (6) of the device. The dissolved gas passing through the air inlet pipe (6) of the device is ejected from the porous nozzle (8), passes through the pores of the porous packing (9), and flows out from above the porous packing (9). The upper edge of the porous packing (9) is at a height of h relative to the bottom of the inner cavity. The dissolved gas is acetylene; The solvent is acetone or DMF; The solvent separation unit is provided with a separation structure, which is a gas path grid (12). The pore size of the gas path grid (12) is 0.1~0.5mm. The gas path grid (12) is a layered structure, with adjacent upper and lower layers placed in an alternating manner with staggered pore positions. The gap between the layers is 20mm-50mm. Alternatively, the separation structure may be a multi-layer pleated filter element or a powder filter element, wherein the filtration accuracy of the multi-layer pleated filter element or the powder filter element is less than or equal to 5 micrometers.

2. The dissolved gas storage device according to claim 1, characterized in that: The inlet pressure regulating valve (7) is installed on the inlet pipe (6) of the device to regulate the pressure of the gas entering the dissolved gas storage device; The outlet pressure regulating valve (14) is installed on the outlet pipe (13) of the device to regulate the pressure of the gas output by the dissolved gas storage device.

3. The dissolved gas storage device according to claim 1, characterized in that: The solvent addition valve (10) is connected to the solvent mixing unit and is positioned above the surface of the solvent liquid to control the entry of solvent into the solvent mixing unit; The solvent discharge valve (11) is connected to the bottom of the solvent mixing unit to control the solvent to be discharged from the solvent mixing unit; The weight detection device (15) is used to detect the weight of the solvent in the dissolved gas storage device.

4. The dissolved gas storage device according to claim 1, characterized in that: The temperature control unit includes: a medium passage (2), a medium inlet (4), a medium outlet (5), and a medium cooling unit (3); The cavity shell of the dissolved gas storage device has a double-layer hollow structure, with the hollow part being the medium passage (2) and the outer layer being the outer wall of the cavity (1). The cooling medium is cooled in the medium cooling unit (3); the cooling medium flows from the medium cooling unit (3) into the medium passage (2) through the medium inlet (4) and flows from the medium passage (2) into the medium cooling unit (3) through the medium outlet (5).

5. The dissolved gas storage device according to claim 4, characterized in that: The cooling medium is water, the medium passage (2) is a cavity water jacket, and the medium cooling unit (3) is a constant temperature chiller.

6. A method for stabilizing the proportion of dissolved gas in the output gas of a dissolved gas storage device, characterized in that, Includes the following steps: S1: Storing dissolved gas: Using the dissolved gas storage device as described in any one of claims 1-5, add solvent to the dissolved gas storage device, turn on the temperature control unit to control the temperature at T ± 1.0℃, where T is selected from -20℃ to 30℃; close the inlet pressure regulating valve (7) and the outlet pressure regulating valve (14), and slowly adjust the inlet pressure regulating valve (7) so that the volumetric flow rate of the dissolved gas entering the inlet pipe (6) of the device is less than the first flow rate; after the pressure of the inlet pressure regulating valve (7) stabilizes at the first pressure, let it stand for more than 8 hours; S2: Output dissolved gas: Connect the gas outlet pipe (13) of the device to the equipment to be used for dissolved gas, open the gas outlet pressure regulating valve (14) and adjust the pressure to the second pressure. The gas containing dissolved gas flows into the equipment to be used for dissolved gas through the gas outlet pressure regulating valve (14).

7. The method according to claim 6, characterized in that: The dissolved gas is acetylene; The first flow rate is 0.015 m³ / (h·L); the first pressure is selected from 0.1-1.0 MPa; the second pressure is selected from 0.001-0.1 MPa.

8. The method according to claim 6, characterized in that: In step S1, the dissolved gas enters the solvent at the bottom of the cavity through the device inlet pipe (6), inlet pressure regulating valve (7), and multi-hole nozzle (8). After mixing with the solvent, it passes through the multi-hole packing (9) and flows out from above the multi-hole packing (9). The gas flowing out from above the multi-hole packing (9) is a gas containing dissolved gas. The gas containing dissolved gas then passes through the gas path grid (12) and is stored in the dissolved gas storage device. The dissolved gas in the storage is in a gaseous state and in a state of being dissolved in the solvent. In step S2, the gas containing dissolved gas flows into the equipment containing dissolved gas to be used through the gas outlet pipe (13).

9. The method according to claim 6, characterized in that: If the weight detection device (15) detects that the solvent weight is less than the preset threshold lower limit, the solvent addition valve (10) is opened to add solvent until the solvent weight is greater than or equal to the threshold lower limit; If the weight detection device (15) detects that the solvent weight is greater than the preset threshold limit, the solvent discharge valve (11) is opened to discharge the solvent until the solvent weight is less than or equal to the threshold limit.

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