On-line monitoring system and method for rapidly determining volatile organic compound with high resolution and high sensitivity

A volatile organic compound, high-sensitivity technology, applied in the direction of measuring devices, analyzing materials, and material analysis by electromagnetic means, can solve the problems of high detection limit, limited detection species, low mass resolution, etc., and achieve high sealing performance , Low maintenance cost effect

Pending Publication Date: 2021-01-15
肖洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, PTR-MS, which is more developed, uses the quadrupole to screen the sample molecules after the proton transfer reaction between the sample molecules and the reaction gas, and then detects them through the detector. This method realizes the rapid detection of VOCs gases, but there are also Many problems, the use of quadrupole mass filter to screen molecules, the determination of molecular range is narrow, the detection species is limited, the mass resolution is low, the detection limit is high, and only a few VOCs molecules with small molecular weight can be detected

Method used

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  • On-line monitoring system and method for rapidly determining volatile organic compound with high resolution and high sensitivity
  • On-line monitoring system and method for rapidly determining volatile organic compound with high resolution and high sensitivity
  • On-line monitoring system and method for rapidly determining volatile organic compound with high resolution and high sensitivity

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Use water as the reaction gas for propylene, acetone, 1,3-butadiene, 1-butene, cyclohexane, benzene, acetaldehyde, acrolein, 2-propanol, methyl vinyl ketone, n-butanol , n-valeraldehyde, n-hexanal and other substances were determined.

[0081] An on-line monitoring system for rapid determination of volatile organic compounds with high resolution and high sensitivity, such as figure 1 As shown, it includes a sampling joint 60 and a reaction chamber, the outlet of the sampling joint 60 is connected to a gas filter 61, and the outlet of the gas filter 61 is connected to a precision filter 67 through a first gas delivery pipe 62, and a first electric heating belt is arranged on the periphery of the first gas delivery pipe 62 63. The outlet of the precision filter 67 is connected to the first-level gas-liquid separator 68 and the second-level gas-liquid separator 69 through pipelines, and the gas outlet of the second-level gas-liquid separator 69 is connected to the permeabl...

Embodiment 2

[0125] With oxygen (O 2 ) as a reactive gas to measure VOCs such as acrolein, acetone, ethyl acetate, vinyl acetate, ethylbenzene, carbon disulfide, acetaldehyde, 2-propanol, methyl vinyl ketone, n-butanol, n-valeraldehyde, n-hexanal, etc. substance.

[0126] An on-line monitoring system for rapid determination of volatile organic compounds with high resolution and high sensitivity, such as figure 1 As shown, it includes a sampling joint 60 and a reaction chamber, the outlet of the sampling joint 60 is connected to a gas filter 61, and the outlet of the gas filter 61 is connected to a precision filter 67 through a first gas delivery pipe 62, and a first electric heating belt is arranged on the periphery of the first gas delivery pipe 62 63. The outlet of the precision filter 67 is connected to the first-level gas-liquid separator 68 and the second-level gas-liquid separator 69 through pipelines, and the gas outlet of the second-level gas-liquid separator 69 is connected to th...

Embodiment 3

[0149] The on-line monitoring system of the high-resolution and high-sensitivity rapid determination of volatile organic compounds adopted is the same as in Example 2, except that the following parameters are different:

[0150] Nitric oxide (NO) was used as the reactive gas to determine the components of VOCs in the waste gas from stationary pollution sources in enterprises.

[0151] The reaction gas NO flow rate is 7mL / min; the ion source glow discharge area pressure is 0.9mbar; the reaction tube length is 93cm, the vacuum degree in the reaction tube 14 is adjusted to 10mbar, the temperature is 100°C, and the voltage across the reaction tube 14 is 2.9kV. The E / n in the tube is 170; the voltage of the single lens is -2V for the extraction electrode, -101V for the transmission electrode, -130V for each plate in the TOF detection area, and -130V for the plate of the extraction plate. When entering the ion introduction area of ​​the bottom plate and the extraction plate, the vol...

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Abstract

The invention relates to an analysis and detection instrument, in particular to an online monitoring system and method for rapidly determining volatile organic compounds with high resolution and highsensitivity. The system comprises a sampling joint and a reaction chamber, wherein the sampling joint is connected with a gas filter, a precision filter, a gas-liquid separator, a permeable membrane gas dryer and a sixteen-way switching valve; the reaction chamber comprises an ion source glow discharge region, an ion source drift region, a first differential vacuum cavity and a reaction tube whichare sequentially adjacent, the rear part of the reaction chamber is sequentially connected with a second differential vacuum cavity, an ion transmission region and a TOF detection region, a single lens is arranged in the ion transmission region, and the single lens consists of three groups of electrodes which are arranged left and right; the upper portion of the TOF detection region is communicated with a reflection region through a field-free drift region, and three groups of reflectors and detectors are arranged in the reflection region. The system is wide in molecular weight measurement range, high in resolution and sensitivity, capable of detecting four decimal sites after the molecular weight reaches a decimal point, few in interference factors in the detection process, few in fragment generation, easy to analyze and capable of achieving real-time, rapid and accurate measurement of pollution source waste gas.

Description

technical field [0001] The invention relates to an analysis and detection instrument, in particular to an on-line monitoring system and method for quickly measuring volatile organic compounds with high resolution and high sensitivity. Background technique [0002] With the promulgation of the national "Ten Atmospheric Measures", the determination of volatile organic compounds (VOCs) in the air and exhaust gas has become the key content of atmospheric monitoring. The collected samples are taken back to the laboratory for analysis. This sampling method has many disadvantages: after the sample is collected, there may be adsorption of the gas sampling bag or incomplete desorption of the adsorption tube, and it is impossible to obtain the real value of the pollutants discharged by the enterprise; and the sampling time of this sampling method is often the sampling location. Enterprises know in advance, so there will be measures to interfere with the normal discharge of pollutants...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 肖洋王新娟马珊
Owner 肖洋
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