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CN-224231414-U - Low-temperature permeation trap for online monitoring of greenhouse gases

CN224231414UCN 224231414 UCN224231414 UCN 224231414UCN-224231414-U

Abstract

The utility model relates to the technical field of measurement and test, and discloses a low-temperature permeation trap for on-line monitoring of greenhouse gases, which comprises a low-temperature trap shell, a refrigeration module and a sample gas treatment device, wherein the refrigeration module comprises a compressor, a radiator, an evaporator, an expansion valve and a drying pipe which are sleeved in the low-temperature trap shell, the compressor and the expansion valve, the expansion valve and the radiator, the radiator and the drying pipe, the drying pipe and the evaporator, and the evaporator and the compressor are all communicated through pipelines to form a closed-loop cooling system, the sample gas treatment device comprises a sample gas treatment shell sleeved in the rear end of the low-temperature trap shell, and the middle part of the evaporator is sleeved in the sample gas treatment shell. The low-temperature permeation trap for on-line monitoring of greenhouse gases provided by the utility model has the advantages that the structural design is simple and reasonable, and the water removal effect and flexible regulation and control can be effectively realized through the continuous cooperation operation of the water molecule exchange membrane assembly and the refrigeration module.

Inventors

  • YANG ZHENYU
  • ZHAO HUI
  • 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 (8)

  1. 1. The low-temperature permeation trap for on-line monitoring of greenhouse gases comprises a low-temperature trap shell (1), a refrigeration module and a sample gas treatment device, and is characterized in that the refrigeration module comprises a compressor (2), a radiator (3), an evaporator (4), an expansion valve (5) and a drying pipe (6), wherein the compressor (2) and the expansion valve (5), the expansion valve (5) and the radiator (3), the radiator (3) and the drying pipe (6), the drying pipe (6) and the evaporator (4) are sleeved in the low-temperature trap shell (1), and the evaporator (4) and the compressor (2) are communicated through pipelines to form a closed-loop cooling system; The sample gas treatment device comprises a sample gas treatment shell (8) sleeved in the rear end of a low-temperature trap shell (1), the middle of an evaporator (4) is sleeved in the sample gas treatment shell (8), a copper pipe structure which is circularly folded in the middle of the evaporator (4) forms a sample gas treatment cavity in the sample gas treatment shell (8), a water molecule exchange membrane assembly (9) is sleeved in the sample gas treatment shell (8), the inner space of the sample gas treatment cavity can be divided into an inner treatment space and an outer treatment space by the water molecule exchange membrane assembly (9), four fluid pipeline interfaces (7) are arranged at the rear end of the low-temperature trap shell (1), and two fluid pipeline interfaces (7) are communicated with the inner treatment space, and the other two fluid pipeline interfaces (7) are correspondingly communicated with the outer treatment space.
  2. 2. The low-temperature infiltration trap for on-line monitoring of greenhouse gases according to claim 1, wherein heat preservation cotton is arranged between the surface of the middle part of the evaporator (4) and the inner wall of the sample gas treatment shell (8).
  3. 3. A low-temperature infiltration trap for on-line monitoring of greenhouse gases according to claim 1, wherein the connection between the output ends of the compressors (2) and the input ends of the expansion valves (5), the connection between the output ends of the expansion valves (5) and the input ends of the radiators (3), the connection between the output ends of the radiators (3) and the input ends of the evaporators (4), and the connection between the output ends of the evaporators (4) and the input ends of the compressors (2) are all installed and communicated through pipes.
  4. 4. A low-temperature infiltration trap for on-line monitoring of greenhouse gases according to claim 3, wherein a 1/8 or 1/4 stainless steel threaded ferrule is arranged between the end head of the conduit and the port of the corresponding device.
  5. 5. The low-temperature permeation well for on-line monitoring of greenhouse gases according to claim 1, wherein the water molecule exchange membrane assembly (9) is composed of a support panel (91) and a water molecule exchange membrane (92) which is nested and fixed in the support panel (91), the support panel (91) is nested in the sample gas treatment shell (8), and the water molecule exchange membrane (92) is made of hollow glass fibers.
  6. 6. The low-temperature permeation trap for on-line monitoring of greenhouse gases, as set forth in claim 1, wherein the inner wall of the bottom of the low-temperature trap housing (1) is provided with a threaded hole, the bottom structure of the sample gas treatment housing (8) is provided with a yielding hole capable of being aligned with the threaded hole, and the bottom structure of the sample gas treatment housing (81) and the inner wall of the bottom of the low-temperature trap housing (1) can be detachably mounted in a mode of sleeving the yielding hole with a screw and then locking the yielding hole with the threaded hole in a screw mode.
  7. 7. The low-temperature permeation well for on-line monitoring of greenhouse gases according to claim 1, wherein the low-temperature permeation well casing (1) is internally sleeved with a temperature sensor (10), the detection end of the temperature sensor (10) extends into the sample gas treatment casing (8), and the temperature sensor (10) has a data output function.
  8. 8. The low-temperature infiltration trap for on-line monitoring of greenhouse gases according to claim 1, wherein a water containing disc is arranged at the bottom of the radiator (3), and a fan facing the water containing disc is arranged at the front end of the low-temperature trap shell (1).

Description

Low-temperature permeation trap for online monitoring of greenhouse gases Technical Field The utility model relates to the technical field of measurement and test, in particular to a low-temperature infiltration well 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. The existing sample gas dehydration technical scheme is divided into two types, namely a cold trap technical scheme is adopted, and a sampling system consists of a sampling tower, a sampling tube, primary dehydration equipment, a low-temperature cold trap device, a sampling pump, a flow pressure control module, a calibration module and the like. The second type is a technical scheme adopting a semipermeable membrane, and the sampling system consists of a sampling tower, a sampling tube, primary dewatering equipment, a semipermeable membrane dewatering device, a sampling pump, a flow pressure control module, a calibration module and the like. Both of these two types of technical solutions have some drawbacks during practical use: The technical scheme design of the low-temperature cold trap device is generally derived from a laboratory equipment condenser pipe, and the total volume of the cold trap is larger due to the larger volume of the condenser pipe, so that the gas replacement speed is low. In addition, the use of the cold trap requires timing defrosting or otherwise blocking the interior of the cold trap. Using a single condenser tube, interrupting sampling to defrost; the two condensing pipes are used for alternately operating, heating and defrosting, the dead volume of the pipeline can influence the sample gas when the condensing pipes alternately switch the gas paths, the larger the volume of the condensing pipes is, the larger the influence is, in order to reduce the influence as much as possible, a plurality of electromagnetic valves are needed, the whole system is complex and has higher cost by matching with program control. The technical scheme of the semi-permeable membrane water removing device has the defect that the gas can be dried to the dew point temperature of about-45 to-30 ℃ and the corresponding water vapor concentration is about 376 ppm. The water removal effect is far lower than that of a low-temperature cold trap. Disclosure of utility model Aiming at the defects of the prior art, the utility model provides a low-temperature permeation trap for on-line monitoring of greenhouse gases, and solves the problems raised by the background art. The utility model provides a low-temperature permeation trap for on-line monitoring of greenhouse gases, which comprises a low-temperature trap shell, a refrigeration module and a sample gas treatment device, wherein the refrigeration module comprises a compressor, a radiator, an evaporator, an expansion valve and a drying pipe which are sleeved in the low-temperature trap shell, and the compressor and the expansion valve, the expansion valve and the radiator, the radiator and the drying pipe, the drying pipe and the evaporator are all communicated through pipelines to form a closed-loop cooling system; The sample gas treatment device comprises a sample gas treatment shell sleeved in the rear end of the low-temperature trap shell, the middle part of the evaporator is sleeved in the sample gas treatment shell, a copper pipe structure in a circulating folding shape at the middle part of the evaporator forms a sample gas treatment cavity in the sample gas treatment shell, a water molecule exchange membrane assembly is sleeved in the sample gas treatment shell, the water molecule exchange membrane assembly can divide the inner space of the sample gas treatment cavity into an inner treatment space and an outer treatment space, four fluid pipeline interfaces are arranged at the rear end of the low-temperature trap shell, and two fluid pipeline interfaces are communicated with the inner treatment space and the other two fluid pipeline interfaces are correspondingly communicated with the outer treatment space. Preferably, heat preservation cotton is arranged between the surface of the middle part of the evaporator and the inner wall of the sample gas treatment shell. Preferably, the output ends of the compressors are connected with the input ends of the expansion valves, the output ends of the expansion valves are connected with the input ends of the radiator, the output ends of the radiator are connected with the input ends of the evaporator,