A method of filling a standard gas

Abstract

The application relates to the technical field of gas filling, in particular to a standard gas filling method. The method comprises the following steps: connecting a first raw gas cylinder containing a first standard gas to a first finished gas cylinder which has been vacuumized through a gas distribution device, wherein the gas distribution device comprises a pipeline, and a pressure gauge is arranged on the pipeline; determining the volume of the pipeline; connecting a second raw gas cylinder containing a second standard gas to a second finished gas cylinder; determining the target pressure of the pipeline based on the target mass of the second standard gas to be filled and the volume of the pipeline; opening the valve of the second raw gas cylinder and closing the valve of the second finished gas cylinder, so that the second standard gas in the second raw gas cylinder is added into the pipeline; when the reading of the pressure gauge reaches the target pressure, the valve of the second raw gas cylinder is closed and the valve of the second finished gas cylinder is opened, so that the second standard gas in the pipeline is added into the second finished gas cylinder; when the reading of the pressure gauge is stable, the second finished gas cylinder contains the target mass of the second standard gas.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and more particularly to a method for filling a standard gas. Background Technology

[0002] Standard gases are gaseous standard substances. Standard substances refer to substances or materials that are sufficiently homogeneous and have one or more well-defined properties, used for calibrating instruments, evaluating measurement methods, or determining the amount of a substance.

[0003] Currently, standard gases are mainly filled by pressure, and then the cylinders are weighed, with the difference used as the value (commonly known as the "gravimetric method"). However, if some gases are liquefied or contain liquids and require the addition of organic raw materials or dilution gases, the pressure and mass may not match, making it impossible to accurately control the filling quality of the standard gases.

[0004] Therefore, there is an urgent need to provide a method for filling standard gas to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method for filling standard gas, which can accurately control the filling quality of standard gas.

[0006] This invention provides a method for filling a standard gas, comprising:

[0007] A first raw material gas cylinder containing a first standard gas is connected to a first finished product gas cylinder that has been evacuated via a gas distribution device; wherein, the gas distribution device includes a pipeline and a pressure gauge is installed on the pipeline to monitor the real-time pressure of the pipeline;

[0008] Determine the volume of the pipeline;

[0009] The second raw material gas cylinder containing the second standard gas is connected to the second finished gas cylinder through the gas distribution equipment;

[0010] The target pressure of the pipeline is determined based on the target mass of the second standard gas to be filled into the second finished gas cylinder and the volume of the pipeline.

[0011] Open the valve of the second raw material gas cylinder and close the valve of the second finished product gas cylinder to allow the second standard gas from the second raw material gas cylinder to be introduced into the pipeline;

[0012] When the pressure gauge reading reaches the target pressure, the valve of the second raw material gas cylinder is closed and the valve of the second finished gas cylinder is opened to allow the second standard gas in the pipeline to be added to the second finished gas cylinder; when the pressure gauge reading stabilizes, the second finished gas cylinder is filled with the target mass of the second standard gas.

[0013] Beneficial effects:

[0014] According to the standard gas filling method provided in this embodiment of the invention, the volume of the pipeline is first determined. Then, based on the target mass of the second standard gas to be filled into the second finished gas cylinder and the volume of the pipeline, the target pressure of the pipeline is determined. Next, the second standard gas from the second raw material gas cylinder is filled into the pipeline. When the pressure gauge reading reaches the target pressure, the valve of the second raw material gas cylinder is closed and the valve of the second finished gas cylinder is opened to allow the second standard gas from the pipeline to be added to the second finished gas cylinder. When the pressure gauge reading stabilizes, it can be considered that the second finished gas cylinder contains the target mass of second standard gas. Therefore, the above technical solution can accurately control the filling mass of the standard gas. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic flowchart of a standard gas filling method according to Embodiment 1 of the present invention is shown. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, an embodiment of the present invention provides a method for filling a standard gas, the method comprising:

[0019] Step S1: Connect the first raw material gas cylinder containing the first standard gas to the first finished product gas cylinder that has been evacuated through a gas distribution device; wherein, the gas distribution device includes a pipeline and a pressure gauge is installed on the pipeline to monitor the real-time pressure of the pipeline.

[0020] Step S2: Determine the volume of the pipeline;

[0021] Step S3: Connect the second raw material gas cylinder containing the second standard gas to the second finished product gas cylinder through a gas distribution device;

[0022] Step S4: Determine the target pressure of the pipeline based on the target mass of the second standard gas to be filled into the second finished gas cylinder and the volume of the pipeline;

[0023] Step S5: Open the valve of the second raw material gas cylinder and close the valve of the second finished product gas cylinder to allow the second standard gas from the second raw material gas cylinder to be introduced into the pipeline.

[0024] Step S6: When the pressure gauge reading reaches the target pressure, close the valve of the second raw material gas cylinder and open the valve of the second finished gas cylinder to allow the second standard gas in the pipeline to be added to the second finished gas cylinder; when the pressure gauge reading stabilizes, the second finished gas cylinder is filled with the target mass of the second standard gas.

[0025] In this embodiment, the volume of the pipeline is first determined. Then, based on the target mass of the second standard gas to be filled into the second finished gas cylinder and the volume of the pipeline, the target pressure of the pipeline is determined. Next, the second standard gas from the second raw material gas cylinder is filled into the pipeline. When the pressure gauge reading reaches the target pressure, the valve of the second raw material gas cylinder is closed and the valve of the second finished gas cylinder is opened to allow the second standard gas from the pipeline to be added to the second finished gas cylinder. When the pressure gauge reading stabilizes, it can be considered that the second finished gas cylinder contains the target mass of second standard gas. Therefore, the above technical solution can accurately control the filling mass of the standard gas.

[0026] It is understood that the inventive concept of this invention is as follows: by using a pipeline as an intermediate medium, the volume of the pipeline is first calculated, and then the standard gas from the second raw material gas cylinder is filled into the pipeline. It is assumed that the mass of the standard gas filled into the pipeline is slightly larger than the target mass. Then the standard gas in the pipeline is filled into the second finished gas cylinder. When the pressure gauge reading stabilizes (i.e., when the gas is in equilibrium), it can be assumed that the second finished gas cylinder contains the target mass of standard gas.

[0027] In one embodiment of the present invention, step S2 may specifically include:

[0028] The first mass of the first raw material gas cylinder containing the first standard gas and the second mass of the first finished gas cylinder that has been evacuated are determined using a balance.

[0029] Open the valves of the first raw material gas cylinder and the first finished product gas cylinder to allow the first standard gas from the first raw material gas cylinder to enter the first finished product gas cylinder through the pipeline;

[0030] When the pressure gauge reading reaches the preset value, close the valves of the first raw material gas cylinder and the first finished product gas cylinder;

[0031] Use a balance to determine the third mass of the first raw material gas cylinder and the fourth mass of the first finished product gas cylinder at the current moment;

[0032] The volume of the pipeline is determined based on preset values, the first mass, the second mass, the third mass, and the fourth mass.

[0033] In this embodiment, since the gas distribution equipment is relatively complex, the volume of the pipeline can be quickly determined through the above-mentioned indirect calculation method.

[0034] In one embodiment of the present invention, the preset value is greater than 0.1 MPa and less than 1.5 MPa.

[0035] If the preset value is greater than 1.5 MPa, the gas may expand, which could lead to inaccurate measurement of the pipeline volume. If the preset value is less than 0.1 MPa, the amount of gas injected into the finished gas cylinder may be small, and its mass measurement may be inaccurate. Therefore, preferably, the preset value is greater than 0.1 MPa and less than 1.5 MPa.

[0036] In one embodiment of the present invention, the step of "determining the volume of the pipeline based on a preset value, a first mass, a second mass, a third mass, and a fourth mass" may specifically include:

[0037] The volume of the pipeline is determined using the following formula:

[0038]

[0039] In the formula, V is the volume of the pipeline, m1 is the first mass, m2 is the second mass, m3 is the third mass, m4 is the fourth mass, M1 is the molar mass of the first standard gas, P1 is a preset value, R is the molar gas constant, and T is the temperature.

[0040] In one embodiment of the present invention, the first standard gas is an inert gas, such as helium or argon. This utilizes the characteristic that the volume of an inert gas expands only slightly with pressure changes, thereby ensuring the accuracy of the pipeline volume measurement.

[0041] In one embodiment of the present invention, step S4 may specifically include:

[0042] The target pressure for the pipeline is determined using the following formula:

[0043]

[0044] In the formula, P2 is the target pressure, m is the target mass, R is the molar gas constant, T is the temperature, Z is the preset correction coefficient, Z∈(1,1.2), M2 is the molar mass of the second standard gas, and V is the volume of the pipeline.

[0045] Thus, when the target pressure of the pipeline is calculated, the valve of the second raw material gas cylinder can be opened and the valve of the second finished gas cylinder can be closed to allow the second standard gas from the second raw material gas cylinder to be added to the pipeline; when the pressure gauge reading reaches the target pressure, the valve of the second raw material gas cylinder is closed and the valve of the second finished gas cylinder is opened to allow the second standard gas from the pipeline to be added to the second finished gas cylinder; when the pressure gauge reading stabilizes (i.e., when the gas is in equilibrium), it can be considered that the second finished gas cylinder contains the target mass of the second standard gas.

[0046] In one embodiment of the present invention, the correction factor is related to the type of the second standard gas. The specific correlation will not be elaborated here.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A method for filling a standard gas, characterized in that, include: A first raw material gas cylinder containing a first standard gas is connected to a first finished product gas cylinder that has been evacuated via a gas distribution device; wherein, the gas distribution device includes a pipeline, and a pressure gauge is installed on the pipeline to monitor the real-time pressure of the pipeline; Determine the volume of the pipeline; The second raw material gas cylinder containing the second standard gas is connected to the second finished gas cylinder through the gas distribution equipment; The target pressure of the pipeline is determined based on the target mass of the second standard gas to be filled into the second finished gas cylinder and the volume of the pipeline. Open the valve of the second raw material gas cylinder and close the valve of the second finished gas cylinder to allow the second standard gas from the second raw material gas cylinder to be introduced into the pipeline; When the pressure gauge reading reaches the target pressure, the valve of the second raw material gas cylinder is closed and the valve of the second finished gas cylinder is opened to allow the second standard gas in the pipeline to be added to the second finished gas cylinder; when the pressure gauge reading stabilizes, the second finished gas cylinder is filled with the target mass of the second standard gas. Determining the volume of the pipeline includes: The first mass of the first raw material gas cylinder containing the first standard gas and the second mass of the first finished product gas cylinder that has been evacuated are determined using a balance. Open the valves of the first raw material gas cylinder and the first finished product gas cylinder, so that the first standard gas in the first raw material gas cylinder enters the first finished product gas cylinder through the pipeline; When the pressure gauge reading reaches a preset value, the valves of the first raw material gas cylinder and the first finished product gas cylinder are closed. The third mass of the first raw material gas cylinder and the fourth mass of the first finished product gas cylinder at the current moment are determined using a balance. The volume of the pipeline is determined based on the preset value, the first mass, the second mass, the third mass, and the fourth mass; The first standard gas is an inert gas; The preset value is greater than 0.1 MPa and less than 1.5 MPa; Determining the volume of the pipeline based on the preset value, the first mass, the second mass, the third mass, and the fourth mass includes: The volume of the pipeline is determined by the following formula: In the formula, V The volume of the pipeline is [missing information]. m 1 represents the first mass. m 2 represents the second mass. m 3 represents the third mass. m 4 represents the fourth mass. M 1 represents the molar mass of the first standard gas. P 1 represents the preset value. R The molar gas constant, T For temperature; The determination of the target pressure of the pipeline based on the target mass of the second standard gas to be filled into the second finished gas cylinder and the volume of the pipeline includes: The target pressure of the pipeline is determined using the following formula: In the formula, P 2 represents the target pressure. m For the target quality, R The molar gas constant, T For temperature, Z The preset correction coefficient is Z∈(1,1.2). M 2 represents the molar mass of the second standard gas. V Let be the volume of the pipeline.

2. The method according to claim 1, characterized in that, The correction factor is related to the type of the second standard gas.

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