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CN-224231415-U - Semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gas

CN224231415UCN 224231415 UCN224231415 UCN 224231415UCN-224231415-U

Abstract

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

Inventors

  • ZHAO HUI
  • YANG ZHENYU
  • SHI HENGLIN
  • ZHANG CHENYU

Assignees

  • 江苏海兰达尔科技有限公司
  • 北京海蓝达尔环境科技有限公司

Dates

Publication Date
20260512
Application Date
20250429

Claims (6)

  1. 1. The semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gas comprises a low-temperature cold trap device and an eight-port gas rotary valve (2), and is characterized in that the low-temperature cold trap device comprises a low-temperature cold trap body (1), a plurality of gas sample inlets are arranged at the rear end of a shell of the low-temperature cold trap device, a plurality of input interfaces (3) and output interfaces (4) are arranged on the eight-port gas rotary valve (2), the input interfaces (3) can be connected with the gas sample inlets one by one through a guide pipe, a filter (5) is arranged at one end of the guide pipe far away from the eight-port gas rotary valve (2), and a semi-permeable membrane tube (6) is arranged between the output interfaces (4) and the rear end of the low-temperature cold trap body (1).
  2. 2. The semipermeable membrane sample gas selector for on-line monitoring of greenhouse gas according to claim 1, wherein the number of the gas injection ports is the same as the number of the input ports (3), the number of the input ports is eight, and the eight input ports (3) are equidistantly distributed along the circumferential direction of the eight-port gas rotary valve (2).
  3. 3. The semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gases according to claim 1, wherein the number of the filters (5) is the same as the number of the input interfaces (3), and the filters (5) are specifically of a two-micron stainless steel filter structure.
  4. 4. The semipermeable membrane sample gas selector for on-line monitoring of greenhouse gases according to claim 1, wherein eight gas injection ports are 1/4 inch to 1/8 inch stainless steel threading interfaces, eight guide pipes are 1/8 inch silanized stainless steel pipes, and spiral locking can be performed between a single guide pipe and the corresponding gas injection port.
  5. 5. The semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gas according to claim 1, wherein one end of the semi-permeable membrane tube (6) is fixedly connected with one end of the output interface (4) and is used as an inlet end, the other end of the semi-permeable membrane tube (6) is spirally locked with an air inlet interface installed on the rear end of the cryogenic trap body (1) through a 1/8 inch silanized stainless steel tube, and the air inlet interface is specifically a 1/4 inch-to-1/8 inch stainless steel threading interface.
  6. 6. The semipermeable membrane sample gas selector for on-line monitoring of greenhouse gas according to claim 1, wherein the front end and the rear end of the low-temperature cold trap device are respectively provided with a touch screen industrial personal computer and a delta-shaped socket, and a data communication interface inside the eight-port gas rotary valve (2) is respectively electrically connected with a serial port of the touch screen industrial personal computer and a serial port of a rear end panel of the low-temperature cold trap body (1) through one-to-two parallel serial port lines.

Description

Semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gas Technical Field The utility model relates to the technical field of test and measurement, in particular to a semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gases. Background The gas analyzer designed based on the infrared spectroscopy principle is sensitive to the water vapor concentration in the sample, and the water vapor concentration can absorb infrared light, so that the result accuracy of the gas analyzer is affected. Therefore, according to the national relevant standards, when the analyzer is used for monitoring greenhouse gases (such as CO2 and CH 4), a dehumidifying device is required to be additionally arranged, so that the concentration of water vapor in the sample gas is reduced to be within a required range. Meanwhile, a gas path selection device is needed to deal with the alternate sampling of different sampling heights. In the technical scheme of the prior semipermeable membrane dewatering, a sampling system consists of a sampling tower, a sampling pipe, primary dewatering equipment, a semipermeable membrane dewatering device, a sampling pump, a flow pressure control module, a sample injection selection module and the like, and the defects of single sample injection control mode, low automation degree, adsorptivity of the system, and low response speed exist in the separation of the semipermeable membrane dewatering device and the sample injection selection module. Disclosure of utility model Aiming at the defects of the prior art, the utility model provides a semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gases, which solves the problems raised by the background art. The utility model provides a semi-permeable membrane sample gas selector for on-line monitoring of greenhouse gas, which comprises a low-temperature cold trap device and an eight-port gas rotary valve, wherein 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, a plurality of input interfaces and output interfaces are arranged on the eight-port gas rotary valve, the input interfaces can be connected with the gas sample inlets one by one through a guide pipe, a filter is arranged at one end of the guide pipe, which is far away from the eight-port gas rotary valve, and a semi-permeable membrane tube is arranged between the output interfaces and the rear end of the low-temperature cold trap body. Preferably, the number of the gas injection ports is equal to the number of the input ports, and the eight input ports are equally distributed along the circumference of the eight-port gas rotary valve. Preferably, the number of the filters is the same as the number of the input interfaces, and the filters specifically adopt a two-micrometer stainless steel filter structure. Preferably, the eight gas injection ports are all 1/4 inch-to-1/8 inch stainless steel threading threaded interfaces, the eight guide pipes are all 1/8 inch silanized stainless steel pipes, and spiral locking can be carried out between a single guide pipe and the corresponding gas injection port. Preferably, one end of the semi-permeable membrane tube is fixedly connected with one end of the output interface and is used as an inlet end, the other end of the semi-permeable membrane tube is spirally locked with an air inlet interface installed on the rear end of the cryogenic cold trap body through a 1/8 inch silanized stainless steel tube, and the air inlet interface is specifically a 1/4 inch-to-1/8 inch stainless steel threading threaded interface. Preferably, the front end and the rear end of the cryogenic trap device are respectively provided with a touch screen industrial personal computer and a delta-shaped socket, and the data communication interface inside the eight-port gas rotary valve is respectively electrically connected with the serial port of the touch screen industrial personal computer and the serial port of the rear end panel of the cryogenic trap body by one-to-two parallel serial port lines. Compared with the prior art, the utility model has the following beneficial effects: 1. According to the semipermeable membrane sample gas selector provided by the utility model, except for the semipermeable membrane tube of the finished product assembly, the used guide tubes are all 1/8 inch silanized stainless steel tubes, so that the gas replacement speed in the structures such as the low-temperature cold trap body and the eight-port gas rotary valve is improved, the gas adsorption is reduced, and the rapid response of gas output is realized. 2. According to the semipermeable membrane sample gas selector provided by the utility model, the touch screen industrial personal computer arranged in the semipermeable membrane sample gas selector can realize intelligent automat