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Two-stage multi-channel atmosphere collection pipeline filtration system

A technology of multi-channel filtration and filtration system, applied in the field of two-stage multi-channel atmospheric collection pipeline filtration system, can solve the problems of large volume of filter cavity of cylindrical filter, difficulty in maintaining stable air pressure, increased cleaning and maintenance frequency, etc. To achieve the effect of reducing the frequency of replacing the filter membrane, prolonging the continuous operation time, and avoiding the damage of the instrument

Pending Publication Date: 2019-02-15
INST OF FORESTRY CHINESE ACAD OF FORESTRY
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Problems solved by technology

[0005] However, the increase in the number of membrane filtration stages will increase the air resistance of the pipeline. As the running time increases, the air resistance will become larger and larger, making it difficult to maintain a stable air pressure in the chamber, resulting in an increase in the frequency of cleaning and maintenance; the filter chamber of the cylindrical filter The volume is often large, which will cause the gas mixing process, which will lead to the attenuation of the high-frequency signal of the collected gas concentration.

Method used

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  • Two-stage multi-channel atmosphere collection pipeline filtration system
  • Two-stage multi-channel atmosphere collection pipeline filtration system
  • Two-stage multi-channel atmosphere collection pipeline filtration system

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Embodiment 1

[0030] see Figure 1-3 , a two-stage multi-channel air collection pipeline filtration system, including a multi-channel filter unit 3 arranged between the gas sampling port 1 and the instrument inlet 2, the multi-channel filter unit 3 includes eight filter chambers 4 separated from each other The filter group 5 formed; the filter group 5 is provided with an inlet end air distribution pipe 6 and an air outlet end air distribution pipe 7, and the air intake end air distribution pipe 6 and the air outlet end air distribution pipe 7 all include a main pipe and a shunt corresponding to the filter chamber 4 The branch pipes, the gas distribution pipe 6 at the inlet end, and the gas distribution pipe 7 at the gas outlet are connected to both sides of each filter chamber 4 of the filter group 5 through the branch pipe respectively; The main pipe of the trachea 7 communicates with the instrument air inlet 2; the filter group 5 is provided with a solenoid valve group 8, and the solenoid...

Embodiment 2

[0041] The methane flux observation experiment was carried out in the reed beach in Yueyang, Hunan Province. The gas extraction pump was an Edwards vacuum pump (XDS-35i, Edward, MA, USA). The analyzer and vacuum pump were powered by 220V mains power. Los Gator Research Ltd.) installed the system at the air inlet.

[0042] In this embodiment, the number of filter chambers 4 of the two-stage multi-channel air collection pipeline filter system is 8, and the controller 10 controls each solenoid valve 9 to be independently opened for 1 hour, and then switches to the next solenoid valve 9 in turn. , and cycle open and close.

[0043] Through observation, in the original single-channel plate filter with multi-stage filter membrane, the pollution of the pipeline is extremely serious, and the filter device needs to be replaced in about a week. The problem of chamber contamination is serious, and the cleaning of the pipeline and the internal mirror of the instrument is time-consuming a...

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Abstract

The invention relates to the technical field of pre-filtration of online atmosphere analysis, and discloses a two-stage multi-channel atmosphere collection pipeline filtration system. The system comprises a multi-channel filtration unit, wherein the multi-channel filtration unit comprises a filter group with a plurality of filter chambers; an electromagnetic valve is arranged on each filter chamber; the opening / closing sequence and switching time interval of each electromagnetic valve are independently controlled through a controller, so that when one of the electromagnetic valves is in an open state, the rest electromagnetic valves are in a closed state; and the multi-channel filtration unit is provided with a front cyclone filtration device to remove large particulate contaminants and liquid water from gas samples. According to the system, the attenuation effect of high-frequency signals of gas concentrations is prevented from increase, the effective filtration time of pre-filtrationsystems of gas analyzers is increased for multiples, and the liquid water in the gas samples is prevented from entering the instruments to cause instrument damage, so that the continuous operation time of the analyzers is greatly prolonged and the quality of field observation is improved.

Description

technical field [0001] The invention relates to the technical field of pre-filtering for online atmospheric analysis, in particular to a two-stage multi-channel air collection pipeline filtering system. Background technique [0002] In scientific research or observation in related fields such as ecology, environmental science, and geology, it is often necessary to use fast-response instruments to detect trace and trace gas components in the atmosphere (such as CO in the atmosphere). 2 、CH 4 , N 2 O concentration and related isotope ratios, etc.) for continuous online analysis and monitoring. At present, such instruments for the determination of trace and trace gas components in the atmosphere mostly use laser technology. In order to improve the sensitivity of trace gas determination, it is necessary to transport the gas sample into a specific measurement chamber through pipelines to increase the optical path and reduce interference. This type of online analyzer based on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/34B01D50/00
CPCG01N1/34B01D50/20
Inventor 高升华张旭东贺磊王旭姚增旺张俊岭
Owner INST OF FORESTRY CHINESE ACAD OF FORESTRY
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