Low saturated vapor pressure gas release method

Abstract

The present invention discloses a method for releasing low saturated vapor pressure gas, comprising a high-pressure resistant aluminum bottle. A connecting sleeve is threadedly fixedly connected to the top of the high-pressure resistant aluminum bottle. High-pressure nitrogen is filled into the high-pressure resistant aluminum bottle according to the application scenario, or a piston is pushed by an electric module to increase the pressure in the high-pressure resistant aluminum bottle. This ensures that the phase change speed of the liquid tracer gas in the high-pressure resistant aluminum bottle is no longer limited by factors such as the saturated vapor pressure, the volume of the delivery bottle, and the diameter of the release channel. The speed at which the tracer gas transforms from liquid to gas is greatly accelerated, meeting the need for rapid monitoring. Under the action of high pressure, the tracer gas release rate is greatly improved. Depending on different application scenarios, while achieving the same function, the assembly and connection methods of the present invention are selected to meet two different application scenarios (in a chemical explosion environment and a slightly positive pressure environment) to achieve rapid release of low saturated vapor pressure tracer gas. The device is also reduced in size and easy to install.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid gas release, in particular to a method for releasing low saturated vapor pressure gas. Background Art

[0002] In the field of leak monitoring or leak detection of high-voltage electrical equipment, liquid SF6 is usually used as a tracer gas. Its saturated vapor pressure in a slightly positive pressure environment is about 2 MPa. Therefore, liquid SF6 with high saturated vapor pressure can be quickly converted into gas, realizing gas tracing and facilitating rapid analysis and monitoring of instruments.

[0003] Application No. 201510557987.1 discloses a tracer gas delivery device for sealed explosion leakage monitoring, which can be used for delivering SF6 tracer gas under explosion conditions. However, the device has certain limitations. In a normal temperature and pressure environment, a gas with a low saturated vapor pressure cannot be used as a tracer. When its liquid gas is converted into a gaseous state, it needs to absorb heat from the external environment, which will cause the temperature of the delivery device to drop. The low temperature will reduce the liquid saturated vapor pressure of the gas with a low saturated vapor pressure, further reducing the speed of phase change conversion. In order to meet the needs of rapid monitoring, the present invention proposes a low saturated vapor pressure gas release method. Summary of the Invention

[0004] The object of the present invention is to provide a method for releasing gas with low saturated vapor pressure to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for releasing low saturated vapor pressure gas, assembling a low saturated vapor pressure gas release device, the low saturated vapor pressure gas release device comprises a high-pressure resistant aluminum bottle, the top of the high-pressure resistant aluminum bottle is fixedly connected with a connecting sleeve with a threaded connection, the end of the connecting sleeve is fixedly installed with an electric ball valve, and one end of the connecting sleeve in the high-pressure resistant aluminum bottle is fixedly connected with an exhaust pipe; a three-way joint is provided between the connecting sleeve and the electric ball valve, the end of the three-way joint is correspondingly connected to the connecting sleeve and the electric ball valve, the other end of the three-way joint is connected to a connecting elbow, the other end of the connecting elbow is fixedly connected to a booster syringe, a piston is provided in the booster syringe, an electric module is fixedly installed at the bottom end of the inner wall of the booster syringe, the electric module is a linear stepping motor, and the output end of the electric module is connected to the piston; the end of the electric ball valve is fixedly connected to a connector, the end of the connector is fixedly connected to a connecting pipe, the end of the connecting pipe is sealed and fixedly connected to a glass sealing tube, and the connecting tube is connected to the inside of the glass sealing tube;

[0007] When used in a chemical explosion environment, high-pressure nitrogen is filled into a high-pressure aluminum cylinder containing saturated vapor pressure tracer gas of liquid CF2ClBr through an electric ball valve to pressurize the interior of the high-pressure aluminum cylinder. The connecting pipe is connected to the electric ball valve through a connector. The device is deployed, the electric ball valve is pre-opened, and a glass sealing tube connected to the connecting pipe is placed near the explosion leak point. The explosive impact force breaks the glass sealing tube, and the liquid tracer gas in the high-pressure aluminum cylinder is subjected to high pressure, achieving rapid release of the liquid tracer gas. Alternatively, when used in a slightly positive pressure environment, the high-pressure aluminum cylinder contains the saturated vapor pressure of liquid CF2ClBr. The device is deployed in a non-explosive, slightly positive pressure environment, and the electric module pushes the piston to increase the pressure in the high-pressure aluminum cylinder with the pressurizing syringe. The pressure inside the high-pressure aluminum cylinder increases, and the electric ball valve is opened through timer / remote control to achieve rapid release of the liquid tracer gas in the high-pressure aluminum cylinder.

[0008] Compared with the prior art, the beneficial technical effects of the present invention are:

[0009] The present invention fills high-pressure nitrogen into the high-pressure resistant aluminum bottle according to the application scenario, or uses an electric module to push a piston to increase the pressure in the high-pressure resistant aluminum bottle. As a result, the phase change speed of the liquid tracer gas in the high-pressure resistant aluminum bottle will no longer be limited by factors such as the saturated vapor pressure, the volume of the delivery bottle, and the diameter of the release channel. The speed of the tracer gas converting from liquid to gas will be greatly accelerated, meeting the needs of rapid monitoring. Moreover, under the action of high pressure, the tracer gas release rate is greatly improved.

[0010] The present invention provides two implementation approaches to meet two different application scenarios (chemical explosion environment and micro-positive pressure environment) to achieve rapid release of low saturated vapor pressure tracer gas.

[0011] According to different application scenarios, under the premise of achieving the same function, the present invention selects the assembly and connection method of the present invention to meet two different application scenarios (chemical explosion environment and micro-positive pressure environment) to achieve rapid release of low saturated vapor pressure tracer gas, and the device volume is reduced, which is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a schematic structural diagram of the low saturated vapor pressure gas release device used in a chemical explosion environment of the present invention.

[0013] Figure 2 The figure is a cross-sectional view of the low saturated vapor pressure gas release device used in a chemical explosion environment according to the present invention.

[0014] Figure 3 The figure is a schematic structural diagram of the low saturated vapor pressure gas release device used in a slightly positive pressure environment of the present invention.

[0015] Figure 4 It is a cross-sectional view of the low saturated vapor pressure gas release device used in a slightly positive pressure environment of the present invention.

[0016] In the figure: 1. High-pressure resistant aluminum bottle; 2. Connecting sleeve; 3. Electric ball valve; 4. Connecting head; 5. Connecting pipe; 6. Glass sealing tube; 7. Exhaust pipe; 8. T-joint; 9. Connecting elbow; 10. Booster syringe; 11. Piston; 12. Electric module. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0018] See also Figures 1-2 In an embodiment of the present invention, a method for releasing low saturated vapor pressure gas is provided, and a low saturated vapor pressure gas release device is assembled. The low saturated vapor pressure gas release device includes a high-pressure resistant aluminum bottle 1, a connecting sleeve 2 is fixedly connected to the top of the high-pressure resistant aluminum bottle 1 through a thread, an electric ball valve 3 is fixedly installed on the end of the connecting sleeve 2, one end of the connecting sleeve 2 in the high-pressure resistant aluminum bottle 1 is fixedly connected to an exhaust pipe 7, a connector 4 is fixedly connected to the end of the electric ball valve 3, a connecting pipe 5 is fixedly connected to the end of the connecting pipe 4, and the connecting pipe 5 is a copper tube. The end of the connecting pipe 5 is sealed and fixedly connected to a glass sealing tube 6, and the connecting pipe 5 is connected to the inside of the glass sealing tube 6;

[0019] When used in a chemical explosion environment, high-pressure nitrogen is filled into the high-pressure resistant aluminum cylinder 1 containing saturated vapor tracer gas of liquid CF2ClBr through the electric ball valve 3 to pressurize the interior of the high-pressure resistant aluminum cylinder 1. The connecting pipe 5 is connected to the electric ball valve 3 through the connector 4. The device is deployed, the electric ball valve 3 is opened in advance, and the glass sealing tube 6 connected to the connecting pipe 5 is placed near the explosion leakage point. The glass sealing tube 6 is broken by the impact force of the explosion, and the liquid tracer gas in the high-pressure resistant aluminum cylinder 1 is subjected to high pressure, thereby achieving rapid release of the liquid tracer gas. Example 2

[0020] See also Figures 3-4In an embodiment of the present invention, a method for releasing low saturated vapor pressure gas is provided, and a low saturated vapor pressure gas release device is assembled. The low saturated vapor pressure gas release device is a high-pressure resistant aluminum bottle 1, and a connecting sleeve 2 is fixedly connected to the top of the high-pressure resistant aluminum bottle 1, and an electric ball valve 3 is fixedly installed on the end of the connecting sleeve 2. One end of the connecting sleeve 2 in the high-pressure resistant aluminum bottle 1 is fixedly connected to an exhaust pipe 7, and a three-way joint 8 is provided between the connecting sleeve 2 and the electric ball valve 3. The ends of the three-way joint 8 are correspondingly connected to the connecting sleeve 2 and the electric ball valve 3, and the other end of the three-way joint 8 is connected to a connecting elbow 9, and the other end of the connecting elbow 9 is fixedly connected to a booster syringe 10, a piston 11 is provided in the booster syringe 10, and an electric module 12 is fixedly installed on the bottom end of the inner wall of the booster syringe 10, and the output end of the electric module 12 is connected to the piston 11. The electric module 12 is a linear stepping motor, and its telescopic shaft is connected to the piston. A 5V power supply and a single-chip microcomputer for controlling the electric module 12 and the electric ball valve 3 are installed in the device;

[0021] When used in a slightly positive pressure environment, the high-pressure resistant aluminum cylinder 1 contains the saturated vapor pressure of liquid CF2ClBr. The device is placed in a non-explosive, slightly positive pressure environment, and the piston 11 is pushed by the electric module 12 to enable the booster syringe 10 to increase the pressure in the high-pressure resistant aluminum cylinder 1, thereby increasing the pressure in the high-pressure resistant aluminum cylinder 1. The electric ball valve 3 is opened by timing / remote control to achieve rapid release of the liquid tracer gas in the high-pressure resistant aluminum cylinder 1.

[0022] When the liquid tracer gas used in the present invention is stored in a container (a high-pressure resistant aluminum bottle), under the action of saturated vapor pressure, the container is in a state of gas and liquid coexistence.

[0023] The low saturated vapor pressure gas release device used in the present invention provides two implementation methods and application scenarios for the rapid release of low saturated vapor pressure liquid gas.

[0024] First, it is suitable for autonomous and controlled rapid release under non-explosive, slightly positive pressure conditions. A linear motor drives the gas-tight syringe to pressurize the gaseous portion of the container. During release, the electric ball valve is opened through timed / remote control to achieve rapid release of the liquid tracer gas.

[0025] Second, it's suitable for passive rapid release under chemical explosion and slightly positive pressure conditions. A two-way ball valve connects to a high-pressure nitrogen cylinder to pressurize the gaseous portion of the container. One end of the copper tube is connected to an electric ball valve, and the other to a high-pressure glass sealing tube. During release, the electric ball valve is pre-opened, and the glass sealing tube is guided near the explosion center. The explosive force shatters the glass sealing tube, allowing for the rapid release of the liquid tracer gas.

[0026] The quantitative numerical range of the ambient micro-positive pressure applied by the low saturated vapor pressure gas release device adopted by the present invention is 10%-30% higher than the standard atmospheric pressure.

[0027] Both release methods are driven by high pressure, and the liquid gas is released directly into the external environment through the copper tube at the bottom of the bottle to meet the demand for rapid release of low saturated vapor pressure liquid gas.

[0028] The low saturated vapor pressure gas release device mainly consists of the following components: (1) a high-pressure aluminum bottle for storing liquid tracer gas. (2) an electric ball valve for gas line cutoff and switching; (3) a booster syringe for pressurizing the gas in the bottle; (4) a linear stepper motor for driving the syringe; (5) a vacuum gauge for monitoring the gas source and sample pressure; (6) a hose / copper tube that goes straight through the bottom of the bottle for releasing the tracer gas into the external environment in liquid form; (7) a connecting elbow 9 (elbow joint) for connecting the gastight syringe, the electric ball valve and the high-pressure aluminum bottle; (8) several aluminum alloy fixing blocks for connecting and fixing the various components of the device; (9) a three-way connector 8 for connecting the electric ball valve, the vacuum gauge and the high-pressure high-purity nitrogen bottle; (10) a glass sealing tube 6 for sealing the tracer gas in the release device.

[0029] The application method of the present invention is:

[0030] 1. In a non-chemical explosion micro-positive pressure environment, the tracer gas is released by pressurizing the booster syringe: (1) Process and assemble a low saturated vapor pressure gas release device, wherein the three-way connector 8 has three vent ports. The first vent port of the three-way connector 8 is connected to the bottle mouth of the high-pressure aluminum bottle 1 through the connecting sleeve 2, and the second vent port is connected to the gas outlet of the booster syringe through the pressure reducing valve and the connecting elbow 9. The third vent port is connected to the vacuum gauge and the electric ball valve 3; open the electric ball valve 3, and fill the high-pressure aluminum bottle 1 (tracer gas pure gas storage bottle) with liquid tracer gas CF2ClBr by inverting the high-pressure aluminum bottle 1. After filling to the specified release amount, close the electric ball valve 3 to release the gas therein. The release channel is cut off; (2) the electric module 12 (linear stepper motor) is started, and the booster syringe 10 (airtight syringe) is driven by the linear motor to pressurize the high-pressure aluminum bottle 1 until the final pressure in the high-pressure aluminum bottle 1 is 5-10 times higher than the atmospheric pressure of the experimental environment in which the high-pressure aluminum bottle 1 is located and the vacuum gauge reading is stable, and the electric ball valve 3 is closed; (3) the glass sealing tube 6 is placed in a non-explosive micro-positive pressure environment in advance, and the quantitative numerical range of the micro-positive pressure is 10%-30% higher than the standard atmospheric pressure. When releasing the tracer gas, the electric ball valve 3 is opened timed / remotely to release the liquid tracer gas in the high-pressure aluminum bottle 1 directly from the third vent port of the three-way connector 8 and the electric ball valve 3 to the outside space.

[0031] 2. Release the tracer gas by pressurizing the high-pressure, high-purity nitrogen bottle in the slightly positive pressure environment of the chemical explosion: (1) Process and assemble the low saturated vapor pressure gas release device. The three-way connector 8 has three vent ports. Connect the first vent port of the three-way connector 8 to the bottle mouth of the high-pressure resistant aluminum bottle 1 through the connecting sleeve 2, and connect the second vent port through the pressure reducing valve and the connecting elbow 9. Figure 3 、 4 The third vent port of the high-pressure, high-purity nitrogen bottle of the booster injector 10 is connected to a vacuum gauge and an electric ball valve 3. The electric ball valve 3 is opened, and the high-pressure resistant aluminum bottle 1 (the pure tracer gas storage bottle) is filled with liquid tracer gas CF2ClBr by inverting the high-pressure resistant aluminum bottle 1. After the high-pressure resistant aluminum bottle 1 (the pure tracer gas storage bottle) is filled to a specified amount, the electric ball valve 3 is closed, thereby blocking the gas release channel therein. (2) Unscrew the rotary switch valve installed on the mouth of the high-pressure high-purity nitrogen bottle, and then adjust the pressure of the pressure reducing valve outlet to 5-10 times the atmospheric pressure of the experimental environment where the high-pressure resistant aluminum bottle 1 is located, until the final pressure in the high-pressure resistant aluminum bottle 1 is higher than 5-10 times the atmospheric pressure of the experimental environment where the high-pressure resistant aluminum bottle 1 is located and the vacuum gauge reading is stable, and close the electric ball valve 3; (3) Connect the air inlet of the connecting pipe 5 (copper tube) to the electric ball valve, and connect its air outlet to the glass sealing tube 6 (high-pressure resistant glass sealing tube); pre-place the glass sealing tube 6 in a non-chemical explosion micro-positive pressure environment near the ground chemical explosion point (that is, place it within the effective explosion impact range of the ground chemical explosion point (explosion center)) and open the electric ball valve 3 in advance until a chemical explosion occurs in the environment where the glass sealing tube 6 is located. After the glass sealing tube 6 is broken by the impact of the external chemical explosion, the liquid gas is directly released from the air outlet of the connecting pipe 5 (copper tube) to the external space.

[0032] The main innovations of this invention include: 1. It provides two implementation methods and application scenarios, enabling the rapid release of low-saturated vapor pressure gas in a chemical explosion / micro-positive pressure environment. 2. It provides a faster release rate for low-saturated vapor pressure gas. Compared to conventional unpressurized delivery devices, the phase change rate of liquid CF2ClBr is no longer limited by the device's volume or the diameter of the gas release port. Liquid gas is released directly into the external space, significantly accelerating the liquid-to-gas transition rate. 3. It features an automated process and high stability. Operations such as opening and closing the electric ball valve and pressurizing the gas within the delivery bottle (a high-pressure aluminum bottle) are all performed via software instructions, and the circuit module is controlled by a single-chip microcomputer, ensuring high reliability and stability. 4. The device of this invention boasts a compact structure and minimizes cross-contamination. It improves upon the glass sealing tube described in patent document CN201510557987.1, reducing its size while achieving the same functionality. This simplifies the manufacturing and assembly process, reduces dead volume in the device's piping, and facilitates installation and cleaning.

[0033] The technical advantage of this invention lies in the following: To address the slow release rate of low-saturated vapor pressure liquid gases in chemical explosion / micro-positive pressure environments, the present invention has developed a pressurized delivery device. This device features remote / timed opening and closing of an electric ball valve. Once the liquid tracer gas is filled, it can be connected according to the schematic structure shown in the accompanying figure to automatically pressurize the delivery bottle (a high-pressure aluminum bottle). The delivery device's assembly and connection methods can be tailored to different application scenarios, enabling rapid release of low-saturated vapor pressure liquid gases in micro-positive pressure environments. Compared to conventional sealed delivery bottles (high-pressure aluminum bottles), the release rate is significantly superior. Experiments have shown that using a conventional delivery device, with 1 mol of CF2BrCl tracer gas (standard 22.4 L) at room temperature and pressure, approximately 30% of the gas in the delivery bottle is released within 30 seconds. Using a pressurized device (boosting syringe 10 or high-pressure, high-purity nitrogen bottle), the release rate can reach over 80% under the same experimental conditions. The phase change speed of liquid CF2ClBr will no longer be limited by factors such as the saturated vapor pressure, the volume of the delivery bottle, and the diameter of the release channel. The speed of liquid-gas conversion will be greatly accelerated to meet the needs of rapid monitoring.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for releasing low saturated vapor pressure gas, characterized in that: A low saturated vapor pressure gas release device is assembled. The low saturated vapor pressure gas release device comprises a high-pressure resistant aluminum bottle (1). The top of the high-pressure resistant aluminum bottle (1) is fixedly connected to a connecting sleeve (2) by a thread. An electric ball valve (3) is fixedly installed at the end of the connecting sleeve (2). One end of the connecting sleeve (2) in the high-pressure resistant aluminum bottle (1) is fixedly connected to an exhaust pipe (7). A three-way joint (8) is provided between the connecting sleeve (2) and the electric ball valve (3). The end of the three-way joint (8) is correspondingly connected to the connecting sleeve (2) and the electric ball valve (3). The other end of the three-way joint (8) is connected to a connecting elbow. (9), the other end of the connecting elbow (9) is fixedly connected to a booster syringe (10), a piston (11) is provided in the booster syringe (10), an electric module (12) is fixedly installed at the bottom end of the inner wall of the booster syringe (10), the electric module (12) is a linear stepping motor, and the output end of the electric module (12) is connected to the piston (11); the end of the electric ball valve (3) is fixedly connected to a connector (4), the end of the connector (4) is fixedly connected to a connecting pipe (5), the end of the connecting pipe (5) is sealed and fixedly connected to a glass sealing pipe (6), and the connecting pipe (5) is connected to the inside of the glass sealing pipe (6); When used in a chemical explosion environment, high-pressure nitrogen is filled into a high-pressure aluminum bottle (1) containing saturated vapor pressure trace gas of liquid CF2ClBr through an electric ball valve (3) to pressurize the interior of the high-pressure aluminum bottle (1). The connecting pipe (5) is connected to the electric ball valve (3) through a connector (4). The device is deployed, the electric ball valve (3) is opened in advance, and the glass sealing tube (6) connected to the connecting pipe (5) is placed near the explosion leakage point. The glass sealing tube (6) is broken by the explosion impact force, and the liquid in the high-pressure aluminum bottle (1) is released. The liquid tracer gas is subjected to high pressure to achieve rapid release of the liquid tracer gas. Alternatively, when used in a slightly positive pressure environment, the saturated vapor pressure of the liquid CF2ClBr is stored in the high pressure resistant aluminum bottle (1). The device is placed in a non-explosive, slightly positive pressure environment, and the piston (11) is pushed by the electric module (12) to achieve the pressurization of the high pressure resistant aluminum bottle (1) by the booster syringe (10), so that the pressure in the high pressure resistant aluminum bottle (1) increases. The electric ball valve (3) is opened by timing / remote control to achieve rapid release of the liquid tracer gas in the high pressure resistant aluminum bottle (1).

Images