A continuous piston gas storage device with flow control function

Abstract

The application provides a continuous piston gas storage device with flow control function, an upper end of an integrated diaphragm is provided with a support rod, the support rod is slidably connected to a top of a tank body, a displacement sensor is arranged on the support rod or the integrated diaphragm, the displacement sensor is used for detecting a relative position of the integrated diaphragm in the tank body, a lower cavity is arranged inside the tank body and below the integrated diaphragm, an upper cavity is arranged inside the tank body and above the integrated diaphragm, sample gas is filled in the lower cavity, and protective gas is filled in the upper cavity. The continuous piston gas storage device with flow control function has the advantages that the tank body is used for sampling and storing gas, the pressure and the volume of the upper cavity can be controlled to control the gas pressure and the gas volume in the lower cavity, and the volume and the release pressure of the released sample gas can be controlled by adjusting the volume and the pressure of the upper cavity.

Description

Technical Field

[0001] This invention belongs to the field of natural gas detection, and in particular relates to a continuous piston gas storage device with flow control function. Background Technology

[0002] With the gradual development of the new energy industry and industry, the domestic supervision of the quality trade of liquids and gases is becoming increasingly strict. Taking natural gas as an example, natural gas is a gaseous energy-saving fuel. During the trade and transfer process, it is necessary to conduct strict quality inspection and analysis. Natural gas is usually sampled and tested. When collecting natural gas at the port terminal, the existing technology will collect natural gas in a centralized manner, and then extract and release the collected sample gas according to different testing requirements. In order to ensure the accuracy and representativeness of online continuous sampling and analysis, there is an urgent need for a flow control gas storage device that can be used for continuous analysis. Summary of the Invention

[0003] In view of this, the present invention aims to propose a continuous piston gas storage device with flow control function to solve the problem that the gas release is often carried out by the pressure of the sample gas itself during the extraction and release process in the prior art, and the gas release volume is unstable.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A continuous piston gas storage device with flow control function includes a tank mounted on a support. An integrated diaphragm is slidably disposed axially inside the tank, and a support rod is installed at the upper end of the integrated diaphragm. The periphery of the support rod is slidably connected to the top of the tank. A displacement sensor is disposed on the support rod or the integrated diaphragm to detect the relative position of the integrated diaphragm inside the tank. A lower cavity is provided inside the tank and below the integrated diaphragm, and an upper cavity is provided inside the tank and above the integrated diaphragm. The lower cavity is used to fill sample gas, and the upper cavity is used to fill protective gas.

[0006] Furthermore, a first air inlet pipe and a first air outlet pipe are respectively installed on the tank body. The external air storage device is connected to the lower cavity through the first air inlet pipe, and the lower cavity is connected to the downstream device through the first air outlet pipe.

[0007] Furthermore, a pneumatic valve b and a first flow controller are respectively installed in the first air intake pipe along the medium flow direction.

[0008] Furthermore, a pneumatic valve c and a temperature sensor are respectively installed along the medium flow direction of the first air outlet pipe.

[0009] Furthermore, a second air inlet pipe and a second air outlet pipe are respectively installed on the tank body. An external air injection device injects protective gas into the upper cavity through the second air inlet pipe, and the upper cavity is connected to the outside through the second air outlet pipe.

[0010] Furthermore, the second air intake pipe is equipped with a flow control valve and a pneumatic valve a along the flow direction of the protective gas.

[0011] Furthermore, a pneumatic valve d is installed on the second air outlet pipe.

[0012] Furthermore, the integrated diaphragm includes a diaphragm body, and reinforcing ribs are respectively provided at both ends of the diaphragm body. The periphery of the diaphragm body is slidably connected to the inner wall of the tank, and the support rod is fixedly installed on the reinforcing ribs.

[0013] Furthermore, the outer periphery of the diaphragm body is provided with an annular groove, which forms a protective cavity with the inner wall of the tank. The support rod is a hollow structure, and the external gas injection device can be connected to the protective cavity through the support rod.

[0014] Furthermore, a pneumatic valve e, a second flow controller, and a first pressure sensor are respectively installed on the support rod, and a second pressure sensor is installed in the upper cavity.

[0015] Compared with the prior art, the continuous piston gas storage device with flow control function described in this invention has the following beneficial effects: an upper cavity is provided inside the tank and above the integrated diaphragm, the lower cavity is used to fill sample gas, and the upper cavity is used to fill protective gas. The integrated diaphragm is slidably arranged inside the tank along the axial direction. The tank is used for sampling and gas storage, and can maintain the pressure and volume of the upper cavity to control the gas storage pressure and gas storage volume in the lower cavity. By adjusting the volume and pressure of the upper cavity, the volume and release pressure of the released sample gas can be controlled. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of a continuous piston gas storage device with flow control function according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Support; 2-Tank body; 21-Upper cavity; 22-Lower cavity; 3-Integrated diaphragm; 4-Support rod; 5-Displacement sensor; 6-First inlet pipe; 7-First outlet pipe; 8-Pneumatic valve b; 9-First flow controller; 10-Temperature sensor; 11-Pneumatic valve c; 12-Second inlet pipe; 13-Second outlet pipe; 14-Flow control valve; 15-Pneumatic valve a; 16-Pneumatic valve d; 17-Pneumatic valve e; 18-Second flow controller; 19-First pressure sensor; 20-Second pressure sensor. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figure 1As shown, a continuous piston gas storage device with flow control function includes a tank 2 mounted on a support 1. The tank 2 is made of 316LSS material, and the wall thickness of the cylindrical cavity of the tank 2 is 38mm. An integrated diaphragm 3 is slidably disposed axially inside the tank 2, and a support rod 4 is mounted on the upper end of the integrated diaphragm 3. The outer periphery of the support rod 4 is slidably connected to the top of the tank 2, and a displacement sensor 5 is disposed on the support rod 4 or the integrated diaphragm 3. The displacement sensor 5 is used to detect the relative position of the integrated diaphragm 3 inside the tank 2. The support rod 4 is used to fix the integrated diaphragm 3 inside the tank 2 and is used in conjunction with the displacement sensor 5 to control and detect the diaphragm movement state and continuous gas storage dynamics in real time. A lower cavity 22 is provided inside the tank 2 and below the integrated diaphragm 3. The lower cavity 22 is a continuous sample gas storage cavity. In this embodiment, the maximum volume of the lower cavity 22 can reach 75L, and the maximum sample pressure during continuous storage can reach 3.5Ba. Inside the tank 2, above the integrated diaphragm 3, is an upper cavity 21, a protective gas pressurization chamber that provides power for the sample output from the lower cavity 22 and stabilizes the sample output flow rate. The protective gas can be any of nitrogen, helium, or compressed air. The lower cavity 22 is used to fill the sample gas, and the upper cavity 21 is used to fill the protective gas. The displacement sensor 5 is existing technology, and the control method in this embodiment is controlled by a controller. The controller's control circuit can be easily programmed by those skilled in the art. The power supply is also common knowledge in the art. This document mainly uses it to protect the mechanical device, and the control method and circuit connection will not be explained in detail here. The tank 2 is used for sampling and gas storage, and can maintain the pressure and volume of the upper cavity 21 to control the gas storage pressure and gas storage volume in the lower cavity 22. By adjusting the volume and pressure of the upper cavity 21, the volume and release pressure of the sample gas can be controlled.

[0025] A first air inlet pipe 6 and a first air outlet pipe 7 are respectively installed on the tank body 2. The external gas storage device is connected to the lower cavity 22 through the first air inlet pipe 6, and the lower cavity 22 is connected to the downstream device through the first air outlet pipe 7. A pneumatic valve b8 and a first flow controller 9 are respectively installed along the medium flow direction of the first air inlet pipe 6. A pneumatic valve c11 and a temperature sensor 10 are respectively installed along the medium flow direction of the first air outlet pipe 7. The pneumatic valve b8 is an automatic control valve for the sample gas and the sample gas inlet, which plays an on / off role. The first flow controller 9 is existing technology. The first flow controller 9 controls the real-time flow of the sample gas inlet of the gas storage tank and has a pressure detection function. It can monitor the gas pressure in the lower cavity 22 of the gas storage tank in real time and transmit it to the control system. In order to ensure the safety of the field instruments, the power controller is designed with an explosion-proof protective shell with a protection level of IP65.

[0026] A second air inlet pipe 12 and a second air outlet pipe 13 are respectively installed on the tank body 2. An external gas injection device injects protective gas into the upper cavity 21 through the second air inlet pipe 12, and the upper cavity 21 is connected to the outside through the second air outlet pipe 13. A flow control valve 14 and a pneumatic valve a15 are respectively installed on the second air inlet pipe 12 along the flow direction of the protective gas. A pneumatic valve d16 is installed on the second air outlet pipe 13. Pneumatic valves a15, b8, c11, and d16 are normally closed valves of the prior art. When the sample is output through the sample gas outlet, the pneumatic valve a15 at the sample gas inlet is in the open position. In the closed state, the system automatically identifies the output status and automatically opens the pneumatic valve b8 to input drive and protection gas into the upper chamber 21. The specific pressure of the upper chamber 21 is ≤6 bar, which can be monitored in real time by the pressure sensor a. During the sample gas output process, the displacement sensor 5 can upload the diaphragm descent displacement data to the data center in real time. A temperature sensor 10 is designed at the sample gas outlet, with a pressure detection range of 0 to 15 bar and a detection accuracy of ±1%FS. It can monitor the gas pressure in the lower chamber 22 in real time. When the pressure value is 0, the start valve c connected to the sample gas outlet will automatically close.

[0027] The integrated diaphragm 3 includes a diaphragm body, and reinforcing ribs are provided at both ends of the diaphragm body. The outer periphery of the diaphragm body is slidably connected to the inner wall of the tank body 2. The support rod 4 is fixedly installed on the reinforcing ribs. The reinforcing ribs are made of 316L stainless steel and mainly protect the piston diaphragm from deformation and ensure the sealing of the piston separation upper and lower chambers 22. The diaphragm body can be any of the existing hard rubber, fluororubber ring or copper sheet.

[0028] The diaphragm body has an annular groove around its periphery, which forms a protective cavity with the inner wall of the tank 2. The support rod 4 is a hollow structure, and an external gas injection device can be connected to the protective cavity through the support rod 4. A pneumatic valve e17, a second flow controller 18, and a first pressure sensor 19 are respectively installed on the support rod 4. A second pressure sensor 20 is installed inside the upper cavity 21. The pneumatic valve e17 is a normally closed valve of existing technology. The second flow controller 18 and the first pressure sensor 19 are also existing technologies. The first flow controller 9 and the second flow controller 18 are selected according to the actual sample; otherwise, it will cause increased errors and inconsistent data. Issues such as accuracy; in this embodiment, the flow controller accuracy can reach ±0.1L / min, and the control range is 2ml / min~30L / min. Moreover, the specific flow control changes in real time according to the pressure of the lower chamber 22, which can stably input gas into the continuous lower chamber 22. The external gas injection device can fill the protective cavity with isolation gas through the support rod 4. In this embodiment, the isolation gas is the carrier gas required for sample analysis. For example, liquefied natural gas samples require helium as the isolation gas (i.e., the background gas that does not affect the analysis of the target medium can be used) to improve the sealing between the upper chamber 21 and the lower chamber 22.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous piston gas storage device with flow control function, characterized in that: The container includes a tank (2) mounted on a support (1). An integrated diaphragm (3) is slidably mounted inside the tank (2) along the axial direction. A support rod (4) is mounted on the upper end of the integrated diaphragm (3). The outer periphery of the support rod (4) is slidably connected to the top of the tank (2). A displacement sensor (5) is mounted on the support rod (4) or the integrated diaphragm (3). The displacement sensor (5) is used to detect the relative position of the integrated diaphragm (3) inside the tank (2). A lower cavity (22) is provided inside the tank (2) and below the integrated diaphragm (3). An upper cavity (21) is provided inside the tank (2) and above the integrated diaphragm (3). The lower cavity (22) is used to fill sample gas, and the upper cavity (21) is used to fill protective gas.

2. The continuous piston gas storage device with flow control function according to claim 1, characterized in that: The tank (2) is equipped with a first air inlet pipe (6) and a first air outlet pipe (7). The external air storage device is connected to the lower cavity (22) through the first air inlet pipe (6), and the lower cavity (22) is connected to the downstream device through the first air outlet pipe (7).

3. A continuous piston gas storage device with flow control function according to claim 2, characterized in that: The first air intake pipe (6) is equipped with a pneumatic valve b (8) and a first flow controller (9) along the medium flow direction.

4. A continuous piston gas storage device with flow control function according to claim 2, characterized in that: The first air outlet pipe (7) is equipped with a pneumatic valve c (11) and a temperature sensor (10) along the medium flow direction.

5. A continuous piston gas storage device with flow control function according to claim 1, characterized in that: The tank (2) is equipped with a second air inlet pipe (12) and a second air outlet pipe (13). An external air injection device injects protective gas into the upper cavity (21) through the second air inlet pipe (12), and the upper cavity (21) is connected to the outside through the second air outlet pipe (13).

6. A continuous piston gas storage device with flow control function according to claim 5, characterized in that: The second air intake pipe (12) is equipped with a flow control valve (14) and a pneumatic valve a (15) along the direction of the protective gas flow.

7. A continuous piston gas storage device with flow control function according to claim 5, characterized in that: A pneumatic valve d (16) is installed on the second air outlet pipe (13).

8. A continuous piston gas storage device with flow control function according to claim 1, characterized in that: The integrated diaphragm (3) includes a diaphragm body, and reinforcing ribs are provided at both ends of the diaphragm body. The outer periphery of the diaphragm body is slidably connected to the inner wall of the tank (2), and the support rod (4) is fixedly installed on the reinforcing ribs.

9. A continuous piston gas storage device with flow control function according to claim 8, characterized in that: The membrane body has an annular groove around its periphery, which forms a protective cavity with the inner wall of the tank (2). The support rod (4) is a hollow structure, and the external gas injection device can be connected to the protective cavity through the support rod (4).

10. A continuous piston gas storage device with flow control function according to claim 9, characterized in that: A pneumatic valve e (17), a second flow controller (18) and a first pressure sensor (19) are respectively installed on the support rod (4), and a second pressure sensor (20) is installed in the upper cavity (21).

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