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Multi-sensor chromatographic detector and detection method thereof

A multi-sensing and detector technology, applied in the multi-sensing chromatographic detector and its detection field, can solve the problems of large volume, high power consumption and large volume of the peripheral gas circuit system and temperature control system, and achieve non-interference and fast speed. High-sensitivity detection, improved integration and convenience, and high-resolution detection

Inactive Publication Date: 2017-07-11
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

Therefore, when the detected mixed gas contains these mutually interfering gas components, it is difficult to determine the specific content of a certain component
[0004] Using a chromatographic detector, due to the large volume of the peripheral gas system and temperature control system, the detector is large in size. Although it can solve the problem of mutual interference of components, it has the disadvantages of large volume, high power consumption, long analysis time, and difficult operation. Problems such as complexity and high cost greatly limit the wide application of chromatographic detectors, making it difficult to popularize chromatographic detectors

Method used

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  • Multi-sensor chromatographic detector and detection method thereof

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Embodiment 1

[0074] like figure 1 As shown, this embodiment proposes a multi-sensing chromatographic detector, its main structure includes: gas inlet 1, air drying and purification device 2, air pump 3, solenoid valve 4, a detection branch 5, a reference branch 6, Sensing array 7, signal acquisition and data processing system 8; wherein detection branch 5 is provided with chromatographic column 9 and one-way valve 10, and all components are connected through gas pipelines.

[0075] The working principle of the multi-sensing chromatographic detector proposed in this embodiment is the detection method:

[0076] Step 1, open and control the solenoid valve 4, so that the gas sample enters the detection branch 5; after 1 second, close the solenoid valve, and seal the gas sample in the gas tube between the solenoid valve 4 of the detection branch and the chromatographic column 9 on the road; specifically, the following steps are included:

[0077] Step 1-1, first turn on the air pump 3, take a...

Embodiment 2

[0084] like figure 2 As shown, this embodiment proposes a multi-sensing chromatographic detector. Compared with the multi-sensing chromatographic detector in Embodiment 1, the only difference is that the reference branch 6 is removed.

[0085] Its specific working process: open the electromagnetic valve 4, take a certain amount of sample from the pollution source and enter the gas pipeline between the electromagnetic valve 4 and the chromatographic column 9 in the detection branch 5, immediately close the electromagnetic valve 4, and the sample is no longer from the chromatographic column. The detection branch where the column 9 is located enters; at this time, the gas inlet 1 is removed from the pollution source gas, and the air with no pollution or light pollution (which can be judged by the sensor array) is selected to be inhaled, and then the solenoid valve 4 is opened, and the pure air pushes The sample (contaminated gas) that was previously enclosed in the gas line betw...

Embodiment 3

[0087] like image 3 As shown, this embodiment proposes a multi-sensing chromatographic detector, compared with the multi-sensing chromatographic detector in Embodiment 1, the only difference is that there are three detection branches 5 in this embodiment, and each Each detection branch 5 has a chromatographic column 9 and a one-way valve 10, and the chromatographic columns in different branches are filled with different stationary phases.

[0088] By switching different branches through the solenoid valve 4, since the chromatographic column specificity in different detection branches is different (that is, filled with different stationary phases), it is possible to realize the separation of different interfering gases (such as H2S and SO2, CH4 and C2H6, formaldehyde and benzene series, etc.), so as to realize the rapid detection of complex pollution sources without interference.

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Abstract

The invention discloses a multi-sensor chromatographic detector. The multi-sensor chromatographic detector comprises a solenoid valve, at least one detection branch path and a sensor array connected in turn. The detection branch path at least comprises a chromatographic column which is used for separating ingredients in a gas sample entering the detection branch path to obtain gas to be detected, a solenoid valve which is used for controlling the entry of the gas sample into the chromatographic column and controlling transmission of the detected gas separated by the chromatographic column into the sensor array one by one, and the sensor array which is used for detecting the separated gas to be detected and acquiring a detection result. The gas sample is separated in the chromatographic column so that the interference caused by other components but the gas to be detected in the gas sample is avoided. The method has detection and analysis time within 5min and thus interference-free fast highly sensitive detection of complex mixed gas is realized.

Description

technical field [0001] The invention belongs to the field of gas detection, and more specifically relates to a multi-sensing chromatography detector and a detection method thereof. Background technique [0002] A large number of high-sensitivity and broad-spectrum detectors are required to realize on-site monitoring in the fields of rapid detection and diagnosis of respiratory gases, rapid diagnosis of pipeline leakage, monitoring of industrial exhaust emissions, and on-site toxic gas detection of sudden explosion accidents. However, in many existing detection technologies, most of them use multi-sensor integrated detectors or various chromatographic detectors, such as photoionization chromatography detector (GC-PID), hydrogen flame ionization chromatography detector (GC-FID) , ion mobility spectrometry (GC-IMS), etc. [0003] The multi-sensor integrated detector can realize the detection of some components, but the interference between the components is very large, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/78G01N3/06
CPCG01N30/78G01N3/06
Inventor 孙建海
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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