Portable gas monitor for monitoring volatile organic compounds by using differential optical absorption spectroscopy

A technology of differential absorption spectroscopy and volatile organic compounds, applied in the field of gas monitoring, can solve the problems of complex on-site operation, and achieve the effect of increasing the optical path, improving the signal-to-noise ratio, and reducing the diffraction of light

Inactive Publication Date: 2016-12-07
青岛博睿光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GC+FID or GC+PID method needs to carry hydrogen, air and nitrogen with you when detecting VOC, or use hydrogen, air and nitrogen continuous generators, which makes the on-site operation complicated

Method used

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  • Portable gas monitor for monitoring volatile organic compounds by using differential optical absorption spectroscopy
  • Portable gas monitor for monitoring volatile organic compounds by using differential optical absorption spectroscopy
  • Portable gas monitor for monitoring volatile organic compounds by using differential optical absorption spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A portable differential absorption spectrometry volatile organic compound gas monitor, including a heating sampling probe, a heating sample delivery device, and a monitor host;

[0028] The heated sampling probe includes a pre-dust filter 1, a built-in polytetrafluoroethylene air duct 2, a heating insulation sleeve 3 coated on the outside of the polytetrafluoroethylene air duct 2, and a probe outlet connected to the heated sample delivery device. mouth 4;

[0029] The heating sample conveying device is an umbilical cord-type polytetrafluoroethylene sample conduit 5 wrapped around a heating wire 6, and a ferrule-type joint 7 is set to be connected to the monitor host, and a quick interface 8 is set to connect with the heating detection gas chamber in the monitor host The air inlet nozzle 15 is connected, and the probe interface 9 is set to connect with the probe air outlet nozzle 4;

[0030] The host of the monitor includes a heating detection chamber, a light source, a...

Embodiment 2

[0042] When using the portable differential absorption spectrometry volatile organic compound gas monitor of the present invention to detect the concentration of volatile organic compound gas in the tail gas exhaust cylinder of the chemical process, after the instrument is turned on, the computer control system controls the polytetrafluoroethylene air duct of the heating sampling probe 2. The heating sample conveying device and the heating detection gas chamber start heating, and at the same time, the computer control system drives the light source to start preheating, and completes the power supply communication inspection with the spectrometer, GPRS positioning and data transmission unit; after 5 minutes of preheating, the above device reaches the setting After the temperature or work is stable, the computer control system drives the sampling pump to start, and collects the process tail gas according to the set flow rate of 1.0L / min; the gas passes through the dust filter 1 of...

Embodiment 3

[0046] When using the portable differential absorption spectrometry volatile organic compound gas monitor of the present invention to detect the gas leakage of process pipelines and valves, after the instrument is turned on, the computer control system controls the polytetrafluoroethylene air guide tube 2 of the heating sampling probe, and the heating sample is transported The device and the heating detection gas chamber start heating, and the computer control system drives the light source to start preheating, and completes the power supply and communication inspection with the spectrometer, GPRS positioning and data transmission unit; after 10 minutes of preheating, the above devices reach the set temperature or work stably , the computer control system drives the sampling pump to start, and collects the leaked gas according to the set flow rate of 2.0L / min; the gas enters the heating system through the dust filter 1 of the heating sampling probe, the heated PTFE air guide tub...

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PUM

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Abstract

The invention provides a portable gas monitor for monitoring volatile organic compounds by using differential optical absorption spectroscopy, comprising a heating sampling probe, a heating sample conveyer, a heating detecting gas chamber, a light source, a spectrometer, a GPRS (general packet radio service) positioning and data transmission unit, a flow metering and exhausting device, and a computer control system; the heating sample conveyer is connected with the heating sampling probe and the heating detecting gas chamber; light from the light source enters the heating detecting gas chamber and is reflected by a DOVE prism to enter the spectrometer; a mass flow meter of the flow metering and exhausting device is connected with an exhaust nozzle of the heating detecting gas chamber, and flow and on-off of a sampling pump are automatically controlled by the computer control unit; the computer control system uses received data to calculate characteristic signals of gas absorption by using differential difference technique to obtain gas concentration; the accuracy and sensitivity of detection results can be improved through DOVE prism reflection, gas concentration correction and differential difference technique.

Description

technical field [0001] The invention belongs to the field of gas monitoring, and in particular relates to a portable differential absorption spectrometry volatile organic compound gas monitor. Background technique [0002] At present, my country's economy is in a period of rapid growth, the country attaches great importance to environmental protection, and relevant policies and regulations have been introduced one after another. In actual production, there are many types of chemical production processes, involving more than 40,000 organic substances; the process is complex, and the pipelines, valves, and reactors in the production process often leak, drip, and leak; the process tail gas is recycled or destroyed. released into the atmosphere. In today's society, the frequency of volatile organic compounds (VOC) and harmful gaseous pollutants (HAP) nuisance incidents in various countries around the world is increasing, and the consequences of local environmental pollution cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/33G01N21/3504
CPCG01N21/31G01N21/33G01N21/3504
Inventor 郭振铎王德明魏子勇王述伟于清刘志同罗妮杨秀芹
Owner 青岛博睿光电科技有限公司
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