Dissolved gas storage device and method for stably outputting gas

Abstract

The invention provides a dissolved gas storage device and a method for stably outputting gas. The device comprises a gas 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 a solvent into the device, controlling the temperature, connecting a gas inlet pipe of the device to a dissolved gas cylinder, opening a gas inlet pressure regulating valve to regulate the pressure to a first pressure, and standing for more than 8 hours; and S2, outputting the dissolved gas: connecting a gas outlet pipe of the device to equipment to be used, opening a gas outlet pressure regulating valve to regulate the pressure to second pressure, and enabling the gas in the dissolved gas cylinder to flow into the equipment to be used after flowing through the device. Through the device and the method, safe storage and use of the dissolved gas can be guaranteed, the proportion of the dissolved gas in the output gas of the dissolved gas storage device is kept stable, and the problem that the content of a solvent in the output gas is increased due to the fact that the pressure of an inner cavity of the device is reduced along with gas output is solved.

Description

Technical Field

[0001] The invention relates to a dissolved gas storage and use technology, in particular to a device and method for maintaining a stable dissolved gas ratio in output gas during the dissolved gas use process. Background Art

[0002] Dissolved gas refers to gas dissolved in a liquid solvent for storage and transportation. A common dissolved gas is acetylene dissolved in acetone, which belongs to the second category of dangerous gas. Taking dissolved acetylene as an example, in order to achieve the safety of transportation and storage, the gaseous acetylene will be compressed and dissolved in a liquid solvent (usually acetone) during the production process. These liquid solvents are filled in special steel cylinders filled with porous fillers. When used, acetylene gas will spontaneously release from the solvent. Such acetylene is called "dissolved acetylene". Acetylene gas is a relatively active gas. It will rapidly undergo polymerization reaction under high temperature (above 300°C) or pressure conditions, and the heat released will drive the reaction to proceed continuously. This process can easily cause rapid and large accumulation of heat, which may cause an explosion and endanger personal and property safety. By dissolving in a liquid solvent for storage, transportation and use, the safety of acetylene gas can be greatly improved. However, the solubility of acetylene in liquid solvents changes with temperature and pressure (see GB13591-2009, Regulations on Filling of Dissolved Acetylene Cylinders), and the content of liquid solvent volatilized in the output gas during use gradually increases as the cylinder pressure decreases, and changes with the change of the ambient temperature of the cylinder. This phenomenon has a serious impact on scientific research and production activities that require high gas stability (such as CVD growth processes using dissolved acetylene as a carbon source).

[0003] Chinese utility model patent document CN206159814U discloses a new type of pressure vessel for dissolving acetylene, including a bottle shell, a bottle inner shell, a reinforcement structure, an anti-corrosion inner layer and a control valve, wherein the bottle shell is provided with a reinforcement structure, a bottle inner shell and an anti-corrosion inner layer in sequence, and anti-collision strips are symmetrically provided at the upper and lower parts of the outer periphery of the bottle shell, and a bottle mouth shell is provided through the upper end of the bottle shell, and an air outlet pipe, a bottle mouth inner shell, an inner shell extension section, a sealing cushion, a control valve and an anti-leakage gasket are provided in sequence on the bottle mouth shell, a sealing ring is inlaid on the lower side of the outer periphery of the control valve, and a knob is welded on the upper end of the control valve. In the above-mentioned related technologies, the problem of unstable acetylene gas content in the output gas during use is not solved. Therefore, it is urgent to develop a technology that can ensure the stability of the gas output by the dissolved gas storage device. Summary of the invention

[0004] The present invention aims to solve the problems existing in the related art and provides a dissolved gas stabilizing device. By limiting the pressure and temperature within a smaller range, the solvent content in the output gas is stabilized within a certain range, and is not affected by the pressure changes of the dissolved gas storage device itself and the temperature changes of the external environment, thereby greatly ensuring the stability of the gas output by the dissolved gas storage device.

[0005] In view of the limitations existing in the above-mentioned related technologies, the present invention proposes a dissolved gas storage device and a method for stabilizing the dissolved gas ratio 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 make the cavity pressure of the dissolved gas storage device P, P is selected from 0.1-1.0Mpa;

[0008] Solvent mixing unit: used to contain the solvent and control the weight of the 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 the solvent in the gas flowing out of the solvent mixing unit, and 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 be T±1.0°C, where T is selected from -20°C to 30°C;

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

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

[0013] The air inlet pressure regulating valve is arranged on the air inlet pipe of the device to adjust the pressure of the gas entering the dissolved gas storage device;

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

[0015] Further: the solvent mixing unit comprises: a solvent adding valve, a solvent releasing valve, a porous filler, a weight detection device, and a porous nozzle;

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

[0017] The porous nozzle is arranged above the bottom of the inner cavity, extends into the porous filler, and is 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. The gas passing through the air inlet pipe of the device is ejected from the porous nozzle, passes through the pores of the porous filler, and flows out from above the porous filler; wherein the height of the upper edge of the porous filler relative to the bottom of the inner cavity is h;

[0018] The solvent adding valve is connected to the solvent mixing unit and is located above the upper surface of the solvent liquid surface to control the solvent to enter the solvent mixing unit;

[0019] The solvent discharge valve is connected to the bottom of the solvent mixing unit to control the discharge of the solvent 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] Further: the dissolved gas is acetylene;

[0022] The solvent is acetone or DMF;

[0023] A separation structure is provided in the solvent separation unit, and the separation structure is a gas path grid, the aperture of the gas path grid is 0.1-0.5 mm, and the gas path grid is a layered structure, and the adjacent upper and lower layers are placed in a staggered manner, and the gap between the layers is 20 mm-50 mm;

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

[0025] Further: 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 is a double-layer hollow structure with inner and outer layers, wherein the hollow part is the medium passage and the outer layer serves 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 water chiller.

[0029] In a second aspect, the present invention provides a method for stabilizing the dissolved gas ratio in the output gas of a dissolved gas storage device, comprising the following steps:

[0030] S1: storing dissolved gas: using the device described in the first aspect, adding a solvent to the device, turning on the temperature control unit to control the temperature at a temperature of T±1.0°C, where T is selected from -20°C to 30°C; closing the air inlet pressure regulating valve and the air outlet pressure regulating valve, and slowly adjusting the air inlet pressure regulating valve to make the volume flow rate of the dissolved gas entering the air inlet pipe of the device less than the first flow rate; after the pressure of the air inlet pressure regulating valve stabilizes at the first pressure, leaving it to stand for more than 8 hours;

[0031] S2: Output dissolved gas: connect the gas outlet pipe of the device to the equipment to use the dissolved gas, open the gas outlet pressure regulating valve to adjust the pressure to the second pressure, and the gas containing the dissolved gas flows into the equipment to use the dissolved gas through the gas outlet pressure regulating valve.

[0032] Further: the dissolved gas is acetylene;

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

[0034] Further: in step S1, the dissolved gas enters the solvent at the bottom of the cavity through the device air inlet pipe, the air inlet pressure regulating valve, and the porous nozzle, and after mixing with the solvent, passes through the porous filler and flows out from above the porous filler. The gas flowing out from above the porous filler is the gas containing the dissolved gas. The gas containing the dissolved gas passes through the gas path grid and is stored in the device. The stored dissolved gas is in a gaseous state and dissolved in the solvent.

[0035] In step S2, the gas containing dissolved gas flows into the equipment to use the dissolved gas through the device outlet pipe.

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

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

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

[0039] A first aspect of the present invention provides a dissolved gas storage device, which maintains the internal pressure of the device within a certain range by setting an airflow control unit, and controls the temperature in the storage device within a certain range by setting a temperature control unit, thereby avoiding changes in the solubility of the dissolved gas in the liquid solvent due to changes in pressure and temperature, ensuring the safe storage and use of the dissolved gas. At the same time, the solubility remains unchanged, so that it is easy to control the proportion of dissolved gas in the output gas. On this basis, a solvent mixing unit and a solvent separation unit are set up, so that the dissolved gas carries sufficient solvent after being fully mixed with the solvent in the solvent mixing unit, and then the excess solvent in the mixed gas is separated by the solvent separation unit. Under the combined action of the above-mentioned mechanisms, it is avoided that the dissolved gas carries too much or too little solvent, thereby ensuring the stability of the dissolved gas ratio in the output gas.

[0040] The second aspect of the present invention provides a method for stabilizing the proportion of dissolved gas in the output gas of a dissolved gas storage device. By using the above-mentioned device and the steps in the method, the internal pressure and temperature of the dissolved gas storage device are controlled to ensure the safe storage and use of the dissolved gas, while the solubility remains unchanged, so that it is easy to control the proportion of dissolved gas in the output gas. On this basis, after the dissolved gas is fully mixed with the solvent in the solvent mixing unit, the dissolved gas carries sufficient solvent, and then the excess solvent in the mixed gas is separated by the solvent separation unit. Under the combined effect of the above-mentioned mechanisms, the dissolved gas is prevented from carrying too much or too little solvent, thereby ensuring the stability of the dissolved gas ratio in the output gas. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0042] Description of reference numerals:

[0043] 1-Outer wall of cavity

[0044] 2-Media Path

[0045] 3-Medium cooling unit

[0046] 4-Media inlet

[0047] 5-Media outlet

[0048] 6-Install the air intake pipe

[0049] 7-Intake pressure regulating valve

[0050] 8-Multi-hole nozzle

[0051] 9-Porous filler

[0052] 10-Solvent addition valve

[0053] 11-Solvent release valve

[0054] 12-Gas duct grille

[0055] 13- Install the air outlet pipe

[0056] 14-Outlet pressure regulating valve

[0057] 15-Weight detection device DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below. However, it should be understood that the description herein is only used to explain the present invention and is not used to limit the scope of the present invention.

[0059] Unless otherwise defined, all technical terms and scientific terms used herein have the same meanings as those generally understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The characterization means involved in this article can refer to the relevant descriptions in the prior art and will not be repeated herein.

[0060] In order to further understand the present invention, the present invention is further described in detail below in conjunction with the best embodiment.

[0061] Example 1

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

[0063] Airflow control unit: used to store dissolved gas or output gas containing dissolved gas, and make the cavity pressure of the dissolved gas storage device P, P is selected from 0.1-1.0Mpa;

[0064] Solvent mixing unit: used to contain the solvent and control the weight of the 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 of 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%; the preset target value is calculated based on the target value of the dissolved gas ratio in the output gas;

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

[0067] The dissolved gas ratio in the output gas of the dissolved gas storage device is C±1%, where C is selected from 80%-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 listed values ​​within the above numerical range are equally 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 by 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. The present invention is not limited to the above values, and other values ​​not listed in the above range of values ​​are also applicable.

[0070] The dissolved gas is an effective component in the device output gas, such as an organic gas required for combustion, chemical synthesis, etc., such as acetylene and other organic gases that are gaseous at room temperature. The solvent can be a common non-polar solvent such as acetone.

[0071] Preferably, the dissolved gas is acetylene.

[0072] Taking acetylene as the dissolved gas, the gas containing acetylene is fully mixed with the solvent through the solvent mixing unit containing the solvent, and then passes through the separation structure of the solvent separation unit. In this process, it is constantly fully mixed with the solvent gas in the cavity space, so as to separate the excess solvent carried. The above process is combined to achieve a stable acetylene content in the output gas. Therefore, the process of acetylene gas flowing out of the solvent separation unit is mainly to separate the excess solvent carried. After this link, the content of acetylene gas should be close to the target value of acetylene content in the final output gas. The deviation of the solvent content in the gas flowing out of the solvent separation unit and the preset target value is controlled to be less than or equal to 10%, which can ensure that the acetylene content in the output gas meets the target value after passing through the uppermost part of the cavity space. The present invention is not limited to the above-mentioned dissolved gas acetylene, and can also be applied to other dissolved gases dissolved in solvents.

[0073] For example, when the setting range of the dissolved gas ratio X in the output gas is 80%-98%, the preset target value = 20%-2%, and the deviation is controlled to be less than or equal to 10%, that is, 2%-0.2%, ensuring 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°C to 30°C, for example, it can be -20°C, -19°C, -18°C, -17°C, -16°C, -15°C, -14°C, -13°C, -12°C, -11°C, -10°C, -9°C, -8°C, -7°C, -6°C, -5°C, -4°C, -3°C, -2°C, -1°C, 0°C, 1°C, 2°C, 3°C, 4°C, 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15°C, 16°C, 17°C, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, etc. The present invention is not limited to the above values, and other values ​​not listed within the above numerical range are equally applicable. When in use, the temperature is set to a temperature value within the range of -20°C to 30°C, and the device of the present invention can maintain a control accuracy of ±1.0°C of the set temperature value.

[0076] The proportion of dissolved gas C in the output gas is selected from 80%-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. The present invention is not limited to the above values, and other values ​​not listed in the above numerical range are also applicable. When used, the proportion of dissolved gas in the output gas can be set to a value within the range of 80%-98%, and the device of the present 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, Regulations on Filling of Dissolved Acetylene Cylinders", the solubility of acetylene gas changes with temperature and pressure. By setting an airflow control unit to control the internal pressure of the device, and by setting a temperature control unit to control the temperature of the inner cavity of the device, the change of acetylene gas solubility due to pressure and temperature changes is avoided, that is, the solvent content in the output gas is stabilized.

[0078] Table 1 Weight solubility of acetylene in acetone Unit is kilogram per kilogram

[0079]

[0080]

[0081] Within the pressure setting range of the device, no actions such as transportation occur during use, and the temperature is controlled within a relatively low range, thereby ensuring the safety of acetylene during use and preventing the polymerization and explosion of acetylene.

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

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

[0084] The multi-layer pleated filter element or powder filter element has a filtering accuracy value less than or equal to 5 microns and can be made of metal or polymer fiber.

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

[0086] The air intake pressure regulating valve 7 is arranged on the air intake pipe 6 of the device to regulate the pressure of the gas entering the dissolved gas storage device; the air intake pressure regulating valve 7 regulates the air intake pressure of the air intake pipe 6 of the device;

[0087] The gas outlet pressure regulating valve 14 is arranged on the gas outlet pipe 13 of the device to adjust the pressure of the gas output by the dissolved gas storage device. The gas outlet pressure regulating valve 14 adjusts the gas outlet pressure of the gas outlet pipe 13 of the device.

[0088] Further: the solvent mixing unit comprises: a solvent adding valve 10, a solvent releasing valve 11, a porous filler 9, a weight detection device 15, and a porous nozzle 8;

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

[0090] The porous nozzle 8 is arranged above the bottom of the inner cavity, extending into the porous filler 9, parallel to the bottom of the inner cavity, and the height of the porous nozzle 8 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, and the 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 filler 9, and flows out from the top of the porous filler 9; wherein the height of the upper edge of the porous filler 9 relative to the bottom of the inner cavity is h (such as Figure 1 shown);

[0091] The solvent adding valve 10 controls the solvent to enter 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] After the dissolved gas ejected from the porous nozzle 8 is fully mixed with the solvent in the porous filler 9, the content of the solvent carried in the output gas is ensured to be stable, thereby ensuring the content of the dissolved gas in the output gas to be stable.

[0095] The role of porous fillers is to allow dissolved gas to fully mix with the solvent and accelerate the dissolution process. When the dissolved gas reaches the saturation point, the dissolved gas can no longer dissolve in the solvent. However, as the pressure decreases (gas output from the upper part), the dissolved gas will overflow from the solvent and enter the upper space to increase the pressure. The newly entered dissolved gas will continue to dissolve in the solvent, and this cycle 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 0.1-0.5 mm, the gas path grid 12 is a layered structure, the holes between the adjacent upper and lower layers are placed in a staggered manner, and the gap between the layers is 20-50 mm;

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

[0098] Preferably, the solvent is acetone.

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

[0100] The total length of the gas path of the gas path grid 12 is greater than or equal to 500 cm, for example, 500 cm, 1000 cm, 1500 cm, 2000 cm, 2500 cm, 3000 cm, 3500 cm, 4000 cm, 4500 cm, 5000 cm, 6000 cm, 7000 cm, etc. The present invention is not limited to the above values, and other values ​​not listed in the above numerical range are also applicable. The gas path is the shortest path that the gas flows through from the gas flow into the gas path grid 12 to the gas flow out of the gas path grid 12.

[0101] The function of the gas grid 12 is to lengthen the flow path of the acetylene gas flow in the device. When the gas carrying more solvent is dissolved from the solvent solution, the excess solvent will gradually separate from the gas after a long time of flow through the gas grid 12; when the gas carrying less solvent is dissolved from the solvent solution, the solvent will gradually be supplemented from other gases after a long time of flow through the gas grid 12. The above two mechanisms ensure the stability of the acetylene content in the output gas. At the same time, the gas grid 12 also has a small amount of condensation effect, which can make the excess solvent reflux.

[0102] The principle of selective separation of gases by using a grid structure is that smaller gas molecules are more likely to pass through the grid, while larger gas molecules are less likely to pass through the grid, and polar gas molecules are more likely to interact with polar groups on the surface of the grid, thereby being adsorbed on the surface of the grid structure. By adjusting the pore size and surface chemical properties of the porous material of the grid, it is possible to effectively separate excess solvent from acetylene gas, thereby controlling the content of solvent and acetylene within a stable preset range. The separation efficiency of the gas path grid 12 of the present invention for excess solvent can reach more than 98%.

[0103] The gas path grid 12 may be made of glass, ceramic, high molecular polymer, metal organic framework or other materials with strong chemical stability and no reaction with dissolved gas or solvent; the structure of the gas path grid 12 may be a plate grid or a membrane grid.

[0104] The gas path grid 12 is made of a material with a smooth surface and strong chemical stability, which is not easy to absorb acetone droplets. The aperture of the gas path grid is 0.1-0.5mm, and it is a layered structure. In order to prevent direct gas penetration, the holes between the upper and lower layers are staggered to maximize the gas flow path. The gap between the layers of the gas path grid is 20-50mm. The gap between the layers cannot be too large. Too large a gap will reduce the total number of layers and pose a safety hazard. The aperture of the gas path grid 12 is 0.1-0.5mm, for example 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. The present invention is not limited to the above values, and other values ​​not listed in the above numerical range are also applicable.

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

[0106] When the solvent passes through the gas path grid 12 or the multi-layer pleated filter element, it is continuously mixed with the solvent gas in the cavity space. The gas path grid 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 mutually), 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 is continuously mixed with the solvent gas in the space inside the powder filter element, and its internal space is connected to the cavity space (the gases can flow into each other).

[0108] Further: 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 a cavity outer wall 1, and the medium passage 2 is arranged inside the cavity outer wall 1;

[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, the medium inlet 4, the medium outlet 5 and the medium cooling unit 3 form a continuously circulating cooling loop, thereby keeping the temperature in the device constant.

[0112] The device has a cavity inner wall and a cavity outer wall, and the medium passage 2 is a gap formed between the cavity inner wall and the cavity outer wall, that is, the medium passage 2 covers the area inside the entire cavity outer wall;

[0113] Alternatively, the device has an outer wall of the cavity, the medium passage 2 is arranged on the inner side of the outer wall of the cavity, the medium passage 2 is a pipe network composed of pipes, and the area of ​​the outer wall of the cavity covered by the pipe network 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 liquid or gas, and the cooling medium includes but is not limited to air, water, oil, ethylene glycol solution, etc.; the cooling medium needs to use 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 range of T is 0-30°C.

[0117] Preferably, the medium passage 2 is integrally cooled, with the inner and outer walls of the cavity forming a medium cooling jacket interlayer covering the entire cavity, or the medium passage 2 is composed of a structure such as a pipeline through which the cooling medium can flow, covering part of the cavity.

[0118] Most preferably, the medium passage 2 is integrally cooled;

[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 water chiller.

[0120] The device of the present invention maintains the internal pressure of the device within a certain range by setting an airflow control unit, and controls the temperature within a certain range by setting a temperature control unit, thereby avoiding changes in the solubility of dissolved gases due to changes in pressure and temperature, stabilizing the proportion of dissolved gases in the output gas, and also ensuring the safe storage and use of dissolved gases; the dissolved gas and the solvent are fully mixed by setting a solvent mixing unit, and then the excess solvent in the mixed gas is separated by a solvent separation unit, and at the same time, the dissolved gas and the gas in the cavity space where the solvent separation unit is located are continuously mixed evenly, and by combining several mechanisms in the above process, it is ensured that the proportion of dissolved gases in the output gas always remains stable. The device of the present invention adjusts the proportion of dissolved gases in the output gas by adjusting the pressure and temperature; through the above settings, it is ensured that the proportion of dissolved gases in the output gas always remains stable.

[0121] Example 2

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

[0123] S1: storing dissolved gas: using the device as described above, adding solvent to the device, turning on the temperature control unit to control the temperature at T±1.0°C, where T is selected from -20°C to 30°C; closing the air inlet pressure regulating valve 7 and the air outlet pressure regulating valve 14, slowly adjusting the air inlet pressure regulating valve 7 to make the volume flow rate of the dissolved gas entering the air inlet pipe 6 of the device less than the first flow rate; after the pressure of the air inlet pressure regulating valve 7 stabilizes at the first pressure, leaving it to stand for more than 8 hours;

[0124] S2: Outputting dissolved gas: connecting the gas outlet pipe 13 of the device to the equipment to be used for the dissolved gas, opening the gas outlet pressure regulating valve 14 to adjust the pressure to the second pressure, and the gas containing the dissolved gas flows into the equipment to be used for the dissolved gas through the gas outlet pressure regulating valve 14.

[0125] In step S1, the pressure of the air 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 0.2Mpa, and the internal and external pressures are balanced. Under the condition that the air inlet pressure regulating valve 7 maintains the 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, and the inlet pressure is fixed at a value through the inlet pressure regulating valve 7. The outlet pressure regulating valve 14 controls the outlet pressure at a minimum value (the minimum pressure that meets the subsequent flow rate), so that the internal pressure of the device remains basically unchanged, avoiding the impact caused by pressure fluctuations.

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

[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, for example, 8 hours, 9 hours, 10 hours, etc.; the present invention is not limited to the above numerical values, and other unlisted numerical values ​​within the above numerical range are also applicable.

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

[0132] Further: the first flow rate is 0.015m 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 values ​​not listed in the above numerical range are also applicable.

[0133] The first flow rate is a safety threshold, which means that the volume of gas filled in per liter of storage device volume per hour should not exceed 0.015 cubic meters. This limit helps reduce the risks that may be caused during the filling process. For example, a too fast filling speed may cause the gas temperature to rise, increasing the risk of explosion. By limiting the filling volume flow rate, the filling speed of the gas in the storage device can be controlled, thereby reducing the compression heat of the gas during the filling process, avoiding excessive temperatures in the storage device, and ensuring the safety of the filling process.

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

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

[0136] The gas that flows out from above the porous filler 9 after the dissolved gas and the solvent are mixed contains the solvent, and is therefore a gas containing dissolved gas;

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

[0138] When the internal pressure of the device is higher, the content of solvent in the output dissolved gas is lower. Therefore, by allowing the gas to flow through the porous filler 9 and the solvent (usually an acetone solution), the purpose of replenishing the solvent in the gas is achieved, and then the excess solvent is separated through the cavity space and the gas path grid 12, and the dissolved gas and the gaseous solvent are fully mixed, so that the dissolved gas composition flowing out remains stable; the cavity space is the space in the inner cavity space of the device excluding the solvent mixing unit, and the gas path grid 12 basically occupies 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, 36, etc., in order to ensure the effect of stabilizing the content of dissolved gas in the output gas.

[0139] In step S2, the outlet pressure regulating valve 14 is opened to adjust the pressure to the second pressure, and the pressure of the outlet pressure regulating valve 14 is maintained at the minimum pressure that satisfies the subsequent use flow rate, so as to reduce the influence of the pressure change on the device of the present invention caused by the pressure change on the back-end use equipment side. The second pressure is to adjust the outlet pressure of the outlet pressure regulating valve 14 to the minimum pressure that can meet the use flow rate of the back-end equipment.

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

[0141] If the weight detection device 15 detects that the weight of the solvent is greater than the preset upper threshold, the solvent release valve 11 is opened to release the solvent until the weight of the solvent is less than or equal to the upper threshold.

[0142] The lower limit of the threshold is 8-14Kg; the upper limit of the threshold is 9-15Kg. The factors to be considered when selecting the threshold are: ① Bottle volume: The larger the bottle, the more solvent, and the larger the upper and lower limits of the threshold should be; ② Dissolved gas flow rate during use: The larger the dissolved gas flow rate, the more solvent, and the larger the upper and lower limits of the threshold should be selected.

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

[0144] The upper limit of the threshold value 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 listed values ​​within the above numerical range are also applicable.

[0145] When selecting the lower and upper thresholds, make the lower threshold smaller than the upper threshold.

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

[0147] Method 1: Before preparation, read the weight of the bottle, and compare the weight of the bottle after filling the solvent to get the weight of the solvent added; after preparation, read the weight of the bottle after it has been left to stand for more than 8 hours. After use, read the weight of the bottle at the same pressure. Compare the changes before and after to determine the difference in solvent content.

[0148] or,

[0149] Method 2: Before the start of preparation, read the weight of the bottle, which is the tare weight of the gas cylinder; after use, read the weight of the bottle and subtract it from the tare weight to get the weight of dissolved gas (acetylene) + solvent. According to the temperature and pressure table, the solubility of dissolved gas (acetylene) in the solvent can be obtained, and the remaining solvent weight can be obtained by calculation. This method ignores the weight of gaseous acetylene in the cavity.

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

[0151] When adding or releasing the solvent, it is necessary to suspend the use and repeat the preliminary preparation work, step S1 (resting for more than 8 hours).

[0152] The method of stabilizing the proportion of dissolved gas in output gas of the present invention, when used for acetylene gas, can control the internal pressure and temperature of the dissolved gas storage device by using the above device, and separate the excess solvent in the acetylene gas after the acetylene and the solvent are fully mixed, thereby ensuring the storage safety of acetylene and the stability of the acetylene content in the output gas.

[0153] Experimental example:

[0154] Preparation steps (storing acetylene): first add an appropriate amount of acetone solution to the bottom of the device through the solvent adding valve 10, turn on the constant temperature chiller, wait until the water temperature reaches the set value, connect the device inlet pipe 6 to the dissolved gas storage device, close the inlet pressure regulating valve 7 and the outlet pressure regulating valve 14, and slowly adjust the inlet pressure regulating valve 7 to ensure that the volume flow rate of acetylene entering the device is less than 0.015m 3 / (h·L), after the outlet pressure of the air inlet pressure regulating valve 7 stabilizes at 0.2MPa, let it stand for more than 8 hours before it can be used;

[0155] Usage steps (outputting acetylene): connect the device outlet pipe 13 to the back-end use equipment, open the outlet pressure regulating valve 14 and adjust the pressure to 0.001MPa (the minimum pressure to meet the subsequent use flow rate). The acetylene gas in the device enters the acetone solution at the bottom of the cavity through the device inlet pipe 6, the inlet pressure regulating valve 7, and the porous nozzle 8, and then flows into the device outlet pipe 13 through the porous filler 9 and the gas path grid 12, and flows into the back-end use equipment through the outlet pressure regulating valve 14.

[0156] After a period of use, the weight of the device of the present invention is measured by the weight detection device 15. When the acetone loss is too much, the displayed weight decreases to below the lower threshold, and the acetone is added through the solvent adding valve 10. When the acetone is too much, the displayed weight exceeds the upper threshold, and the excess acetone is released through the solvent releasing valve 11; the threshold is set to 9-10KG;

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

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

[0159] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dissolved gas storage device, characterized in that: include: Airflow control unit: used for storing dissolved gas and outputting gas containing dissolved gas, and making the cavity internal pressure of the dissolved gas storage device P, P is selected from 0.1-1.0Mpa; Solvent mixing unit: used to contain the solvent and control the weight of the 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 in the gas flowing out of the solvent mixing unit, and 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 be T±1.0°C, where T is selected from -20°C to 30°C; The content of dissolved gas in the output gas of the dissolved gas storage device is C±1%, where C is selected from 80%-98%.

2. The device according to claim 1, characterized in that: The airflow control unit comprises an air inlet pressure regulating valve (7), an air outlet pressure regulating valve (14), a device air outlet pipe (13), and a device air inlet pipe (6); The air inlet pressure regulating valve (7) is arranged on the air inlet pipe (6) of the device to adjust the pressure of the gas entering the dissolved gas storage device; The gas outlet pressure regulating valve (14) is arranged on the gas outlet pipe (13) of the device to adjust the pressure of the gas output by the dissolved gas storage device.

3. The device according to claim 1, characterized in that: The solvent mixing unit comprises: a solvent adding valve (10), a solvent releasing valve (11), a porous filler (9), a weight detection device (15), and a porous nozzle (8); The solvent mixing unit is arranged at the lower part of the dissolved gas storage device, the porous filler (9) is against the bottom of the inner cavity of the dissolved gas storage device; the solvent is contained in the porous filler (9), and / or the solvent is contained in the gap between the porous filler (9) and the bottom of the inner cavity; The porous nozzle (8) is arranged above the bottom of the inner cavity, extending into the porous filler (9) and parallel to the bottom of the inner cavity. The height 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 filler (9), and flows out from above the porous filler (9); wherein the height of the upper edge of the porous filler (9) relative to the bottom of the inner cavity is h; The solvent adding valve (10) is connected to the solvent mixing unit and is located above the upper surface of the solvent liquid surface to control the solvent to enter the solvent mixing unit; The solvent discharge valve (11) is connected to the bottom of the solvent mixing unit to control the discharge of the solvent 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 device according to claim 1, characterized in that: The dissolved gas is acetylene; The solvent is acetone or DMF; A separation structure is provided in the solvent separation unit, wherein the separation structure is an air path grid (12), the aperture of the air path grid (12) is 0.1-0.5 mm, the air path grid (12) is a layered structure, the adjacent upper and lower layers are arranged in a staggered manner, and the gap between the layers is 20 mm-50 mm; Alternatively, the separation structure is a multi-layer pleated filter element or a powder filter element, and the filtration accuracy of the multi-layer pleated filter element or the powder filter element is less than or equal to 5 microns.

5. The device according to claim 1, characterized in that: The temperature control unit comprises: 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 is a double-layer hollow structure, wherein the hollow part is the medium passage (2) and the outer layer is the cavity outer wall (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).

6. The device according to claim 5, 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 water chiller.

7. A method for stabilizing the dissolved gas ratio in the output gas of a dissolved gas storage device, characterized in that: The following steps are involved: S1: storing dissolved gas: using the device as described in any one of claims 1 to 6, adding solvent to the device, turning on the temperature control unit to control the temperature at a temperature of T±1.0°C, where T is selected from -20°C to 30°C; closing the air inlet pressure regulating valve (7) and the air outlet pressure regulating valve (14), and slowly adjusting the air inlet pressure regulating valve (7) so that the volume flow rate of the dissolved gas entering the air inlet pipe (6) of the device is less than the first flow rate; after the pressure of the air inlet pressure regulating valve (7) is stabilized at the first pressure, leaving it to stand for more than 8 hours; S2: Outputting dissolved gas: Connect the gas outlet pipe (13) of the device to the equipment to use the dissolved gas, open the gas outlet pressure regulating valve (14) to adjust the pressure to the second pressure, and the gas containing the dissolved gas flows into the equipment to use the dissolved gas through the gas outlet pressure regulating valve (14).

8. The method according to claim 7, characterized in that: The dissolved gas is acetylene; The first flow rate is 0.015m 3 / (h·L); the first pressure is selected from 0.1-1.0 MPa; the second pressure is selected from 0.001-0.1 MPa.

9. The method according to claim 7, characterized in that: In step S1, the dissolved gas passes through the device air inlet pipe (6), the air inlet pressure regulating valve (7), and the porous nozzle (8) into the solvent at the bottom of the cavity, and after mixing with the solvent, passes through the porous filler (9) and flows out from above the porous filler (9). The gas flowing out from above the porous filler (9) is the gas containing the dissolved gas. The gas containing the dissolved gas passes through the gas path grid (12) and is stored in the device. The stored dissolved gas is in a gaseous state and is dissolved in the solvent. In step S2, the gas containing dissolved gas flows into the equipment to use the dissolved gas through the device outlet pipe (13).

10. The method according to claim 7, characterized in that: If the weight detection device (15) detects that the weight of the solvent is less than a preset lower threshold, the solvent adding valve (10) is opened to add solvent until the weight of the solvent is greater than or equal to the lower threshold; If the weight detection device (15) detects that the weight of the solvent is greater than the preset upper threshold value, the solvent release valve (11) is opened to release the solvent until the weight of the solvent is less than or equal to the upper threshold value.

Images