Semi-permeable membrane sample gas selector for online monitoring of greenhouse gas

Abstract

The utility model relates to the technical field of test and measurement, and discloses a semi-permeable membrane sample gas selector for greenhouse gas on-line monitoring, which comprises a low-temperature cold trap device and an eight-port gas rotary valve, the low-temperature cold trap device comprises a low-temperature cold trap body, a plurality of gas sample inlets are arranged at the rear end of a shell of the low-temperature cold trap device, and the eight-port gas rotary valve is arranged in the shell of the low-temperature cold trap device. A plurality of input interfaces and output interfaces are arranged on the eight-port gas rotary valve, the plurality of input interfaces can be communicated with the plurality of gas sample injection ports one by one through guide pipes, and a filter is arranged at one end, far away from the eight-port gas rotary valve, of each guide pipe. According to the semi-permeable membrane sample gas selector provided by the utility model, except for the semi-permeable membrane tube of a finished product assembly, the used conduits all adopt 1 / 8 inch silanization stainless steel tubes, so that the gas replacement speed in structures such as a low-temperature cold trap body and an eight-port gas rotary valve is increased, the gas adsorption is reduced, and the quick response of gas output is realized.

Description

Technical Field

[0001] This utility model relates to the field of testing and measurement technology, specifically a semi-permeable membrane sample gas selector for online monitoring of greenhouse gases. Background Technology

[0002] Gas analyzers designed based on infrared spectroscopy principles are highly sensitive to water vapor concentration in samples. Water vapor concentration absorbs infrared light, thus affecting the accuracy of the analyzer's results. Therefore, according to relevant national regulations, when using such analyzers to monitor greenhouse gases (such as CO2 and CH4), a dehumidification device needs to be installed to reduce the water vapor concentration in the sample gas to within the required range. A gas path selection device is also required to handle alternating sample introductions at different sampling heights.

[0003] In existing semi-permeable membrane dewatering technologies, the sampling system consists of a sampling tower, sampling tube, primary dewatering equipment, semi-permeable membrane dewatering device, sampling pump, flow and pressure control module, and sample selection module. It has disadvantages such as the separation of the semi-permeable membrane dewatering device and the sample selection module, the single sample control method, low degree of automation, and the system having adsorption properties and slow response speed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a semi-permeable membrane sample gas selector for online monitoring of greenhouse gases, solving the problems mentioned in the background section.

[0005] This utility model provides the following technical solution: a semi-permeable membrane gas selector for online monitoring of greenhouse gases, comprising a low-temperature cold trap device and an eight-port gas rotary valve. The low-temperature cold trap device includes a low-temperature cold trap body, and a plurality of gas inlets are installed at the rear end of the low-temperature cold trap device housing. The eight-port gas rotary valve is provided with a plurality of input interfaces and output interfaces. The plurality of input interfaces can be connected to the plurality of gas inlets one by one through conduits. A filter is provided at the end of the conduit away from the eight-port gas rotary valve. A semi-permeable membrane tube is installed between the output interface and the rear end of the low-temperature cold trap body.

[0006] Preferably, the number of gas inlets is the same as the number of input interfaces, both being eight, and the eight input interfaces are equidistantly distributed along the circumference of the eight-port gas rotary valve.

[0007] Preferably, the number of filters is the same as the number of input interfaces, and the filters specifically adopt a two-micron stainless steel filter structure.

[0008] Preferably, all eight gas inlets are 1 / 4-inch to 1 / 8-inch stainless steel through-plate threaded interfaces, and all eight conduits are 1 / 8-inch silanized stainless steel tubes, and each conduit can be screw-locked with its corresponding gas inlet.

[0009] Preferably, one end of the semi-permeable membrane tube is fixedly connected to one end of the output interface and serves as the inlet end. The other end of the semi-permeable membrane tube is screwed onto an air inlet installed on the rear end of the cryogenic cold trap body via a 1 / 8-inch silanized stainless steel tube. Specifically, the air inlet is a 1 / 4-inch to 1 / 8-inch stainless steel through-plate threaded interface.

[0010] Preferably, the front and rear ends of the cryogenic cold trap device are respectively equipped with a touch screen industrial control computer and a triangular socket. The data communication interface inside the eight-port gas rotary valve is electrically connected to the serial port of the touch screen industrial control computer and the serial port of the rear panel of the cryogenic cold trap body via a one-to-two parallel serial cable.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The semi-permeable membrane gas selector provided by this utility model, except for the semi-permeable membrane tube of the finished component, uses 1 / 8-inch silanized stainless steel tubes for all the conduits. This improves the gas replacement speed inside the low-temperature cold trap body, the eight-port gas rotary valve and other structures, reduces gas adsorption, and achieves rapid response of gas output.

[0013] 2. The semi-permeable membrane gas selector provided by this utility model has an internal touch screen industrial control computer that can intelligently and automatically control the eight gas rotary valves through supporting software, thereby optimizing the operation effect.

[0014] 3. The semi-permeable membrane gas selector provided by this utility model has an internal eight-port gas rotary valve whose data communication interface is electrically connected to the serial port of a touch screen industrial control computer and the serial port of the rear panel of the low-temperature cold trap body via a one-to-two parallel serial cable. This enables simultaneous control of the eight-port gas rotary valve by the touch screen industrial control computer and related external devices, thus expanding the application range of the eight-port gas rotary valve. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the structure of this utility model;

[0016] Figure 2 This is a three-dimensional schematic diagram of the cryogenic cold trap device of this utility model.

[0017] In the diagram: 1. Low-temperature cold trap body; 2. Eight-port gas rotary valve; 3. Input interface; 4. Output interface; 5. Filter; 6. Semi-permeable membrane tube. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-2 A semi-permeable membrane gas selector for online monitoring of greenhouse gases includes a low-temperature cold trap device and an eight-port gas rotary valve 2. The low-temperature cold trap device includes a low-temperature cold trap body 1, and a number of gas inlets are installed at the rear end of the low-temperature cold trap device housing. The eight-port gas rotary valve 2 is provided with a number of input interfaces 3 and output interfaces 4. The number of input interfaces 3 can be connected to the number of gas inlets one by one through conduits.

[0020] The number of gas inlets is the same as the number of input interfaces 3, and both are set to eight. The eight input interfaces 3 are equidistantly distributed along the circumference of the eight-port gas rotary valve 2. The number of filters 5 is the same as the number of input interfaces 3, and the filters 5 specifically adopt a two-micron stainless steel filter structure.

[0021] All eight gas inlets are 1 / 4-inch to 1 / 8-inch stainless steel through-plate threaded interfaces, and all eight tubing are 1 / 8-inch silanized stainless steel tubing. Furthermore, each tubing can be screw-locked with its corresponding gas inlet.

[0022] A filter 5 is installed on the end of the conduit away from the eight-port gas rotary valve 2. A semi-permeable membrane tube 6 is installed between the output port 4 and the rear end of the cryogenic cold trap body 1. One end of the semi-permeable membrane tube 6 is fixedly connected to one end of the output port 4 and serves as the inlet end. The other end of the semi-permeable membrane tube 6 is screwed onto an air inlet port installed on the rear end of the cryogenic cold trap body 1 through a 1 / 8-inch silanized stainless steel tube. Specifically, the air inlet port is a 1 / 4-inch to 1 / 8-inch stainless steel through-plate threaded interface.

[0023] In use, the external air intake passes through eight conduits and is first filtered by their respective filters 5. The filtered gas then enters the eight-port gas rotary valve 2 through the eight conduits. After adjustment, it enters the low-temperature cold trap body 1 through the output port 4 and semi-permeable membrane tube 6 inside the eight-port gas rotary valve 2 to meet the gas supply requirements.

[0024] In addition to the semi-permeable membrane tube used as a finished component, all the conduits used are made of 1 / 8-inch silanized stainless steel tubes. In addition to controlling costs, this can improve the gas replacement speed inside the low-temperature cold trap body, the eight-port gas rotary valve and other structures, reduce gas adsorption, and achieve rapid response of gas output.

[0025] Furthermore, the spiral locking structure of the 1 / 4-inch to 1 / 8-inch stainless steel through-plate threaded interface and the 1 / 8-inch silanized stainless steel tube provides convenient reciprocating disassembly after damage to the eight-port gas rotary valve 2 and related structures, thus significantly improving maintenance efficiency.

[0026] Please see Figures 1-2 The front and rear ends of the cryogenic cold trap device are respectively equipped with a touch screen industrial control computer and a triangular socket. The data communication interface inside the eight-port gas rotary valve 2 is electrically connected to the serial port of the touch screen industrial control computer and the serial port of the rear panel of the cryogenic cold trap body 1 via a one-to-two parallel serial cable.

[0027] In use, the data communication interface inside the eight-port gas rotary valve 2 is used to connect to the touch screen industrial control computer on the low-temperature cold trap body 1 and the serial port on the rear panel of the low-temperature cold trap body 1 respectively via a one-to-two parallel serial cable. This enables simultaneous control of the eight-port gas rotary valve 2 by the input interface 3 and external devices, expanding the application of the corresponding systems associated with the eight-port gas rotary valve 2.

[0028] The touchscreen industrial computer, with its accompanying software, can achieve intelligent and automatic control of eight gas rotary valves, optimizing operational efficiency.

[0029] 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. Additionally, in the accompanying drawings of this utility model, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A semi-permeable membrane gas selector for online monitoring of greenhouse gases, comprising a cryogenic cold trap device and an eight-port gas rotary valve (2), characterized in that: The cryogenic cold trap device includes a cryogenic cold trap body (1), and a number of gas inlets are installed at the rear end of the cryogenic cold trap body. The eight-port gas rotary valve (2) is provided with a number of input interfaces (3) and output interfaces (4). The number of input interfaces (3) can be connected to the number of gas inlets one by one through conduits. A filter (5) is provided at the end of the conduit away from the eight-port gas rotary valve (2). A semi-permeable membrane tube (6) is installed between the output interface (4) and the rear end of the cryogenic cold trap body (1).

2. A semi-permeable membrane sample gas selector for online monitoring of greenhouse gases according to claim 1, characterized in that: The number of gas inlets is the same as the number of input interfaces (3) and is set to eight, and the eight input interfaces (3) are equidistantly distributed along the circumference of the eight-port gas rotary valve (2).

3. A semi-permeable membrane sample gas selector for online monitoring of greenhouse gases according to claim 1, characterized in that: The number of filters (5) is the same as the number of input interfaces (3), and the filters (5) specifically adopt a two-micron stainless steel filter structure.

4. A semi-permeable membrane sample gas selector for online monitoring of greenhouse gases according to claim 1, characterized in that: All eight gas inlets are 1 / 4-inch to 1 / 8-inch stainless steel through-plate threaded interfaces, and all eight conduits are 1 / 8-inch silanized stainless steel tubes. Furthermore, each conduit and its corresponding gas inlet can be screw-locked together.

5. A semi-permeable membrane sample gas selector for online monitoring of greenhouse gases according to claim 1, characterized in that: One end of the semipermeable membrane tube (6) is fixedly connected to one end of the output interface (4) and serves as the inlet end. The other end of the semipermeable membrane tube (6) is screwed with an air inlet installed on the rear end of the low-temperature cold trap body (1) through a 1 / 8-inch silanized stainless steel tube. The air inlet is specifically a 1 / 4-inch to 1 / 8-inch stainless steel through-plate threaded interface.

6. A semi-permeable membrane sample gas selector for online monitoring of greenhouse gases according to claim 1, characterized in that: The front and rear ends of the cryogenic cold trap device are respectively equipped with a touch screen industrial control computer and a triangular socket. The data communication interface inside the eight-port gas rotary valve (2) is electrically connected to the serial port of the touch screen industrial control computer and the serial port of the rear panel of the cryogenic cold trap body (1) via a one-to-two parallel serial cable.

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