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A plant boundary low-concentration benzene series online monitoring system and an online monitoring method

A monitoring system and technology of benzene series, which is applied in the field of low-concentration benzene series on-line monitoring system at the factory boundary, can solve the problems that low-concentration benzene series are difficult to monitor and analyze accurately, so as to improve detection ability and detection accuracy and ensure synchronization , the effect of reducing the failure rate

Pending Publication Date: 2019-09-27
马鞍山市桓泰环保设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that it is difficult to accurately monitor and analyze low-concentration benzene series in the prior art, the present invention provides an on-line monitoring system and online monitoring method for low-concentration benzene series at the factory boundary. By adding a catalytic tube to the chromatographic analyzer, the Benzene series are catalytically decomposed into methane components for detection, with high synchronization of detection results and high accuracy of detection and analysis results

Method used

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  • A plant boundary low-concentration benzene series online monitoring system and an online monitoring method
  • A plant boundary low-concentration benzene series online monitoring system and an online monitoring method
  • A plant boundary low-concentration benzene series online monitoring system and an online monitoring method

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Effect test

Embodiment 1

[0064] An on-line monitoring system for low-concentration benzene series at the factory boundary, such as figure 1 shown, including,

[0065] Atmospheric sampling main pipe 1, which is used to collect sample gas in the atmospheric factory boundary;

[0066] Chromatography analyzer 2, it is communicated with atmospheric sampling main pipe 1, described chromatographic analyzer 2 is internally equipped with quantitative loop 26, chromatographic column 27 and FID flame ionization detector 29, and described quantitative loop 26 is communicated with atmospheric sampling main pipe 1, The chromatographic column 27 is communicated with the quantitative loop 26, and the FID flame ionization detector 29 is communicated with the chromatographic column 27;

[0067] Gas source unit, it comprises hydrogen generator 4, nitrogen generator 5 and zero gas generator 6, transmits hydrogen, nitrogen and zero gas to chromatography analyzer 2 respectively;

[0068] The chromatographic column 27 is ...

Embodiment 2

[0074] The on-line monitoring system for low-concentration benzene series at the plant boundary of this embodiment is further improved on the basis of Embodiment 1, and the catalyst is a noble metal catalyst.

[0075] Noble metal catalysts and transition metal oxide catalysts are commonly used catalysts for the purification of benzene series in VOCs in industry. Benzene series can be decomposed into CO by heating at 150-600 °C through the catalyst. 2 and H 2 O, the effective removal rate is over 99%.

[0076] During the experiment, the applicant found that by using a noble metal catalyst, a small amount of benzene series can pass through the catalyst, stay for a short time, and after heating at a certain temperature, the benzene series can be decomposed into methane. Concentration benzene series on-line monitoring system, the specification of quantitative loop 26 is 1ml in the present embodiment, after being separated by chromatographic column 27, the volume of benzene series...

Embodiment 3

[0081] The on-line monitoring system of low-concentration benzene series in the factory boundary of this embodiment is further improved on the basis of embodiment 2. The main pipe 1 is connected; the main pipeline 101 is provided with an air pump 204 .

[0082] Such as figure 2 As shown, the chromatographic analyzer 2 includes a sample gas inlet 20 , a sample gas outlet 21 , a zero gas inlet 22 , a carrier gas inlet 23 , a driving gas inlet 24 , and a hydrogen gas inlet 25 . The sample gas inlet one 20 is communicated with the main road pipeline 101, the carrier gas inlet 23 is communicated with the nitrogen generator 5 through the pipeline, the driving gas inlet 24 is communicated with the zero gas generator 6 through the pipeline, and the hydrogen inlet 25 is communicated through the pipeline and The hydrogen generator 4 communicates, the zero gas inlet 22 communicates with the zero gas generator 6 through a pipeline, and the sample gas outlet 22 communicates with the outs...

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Abstract

The invention discloses a plant boundary low-concentration benzene series online monitoring system and an online monitoring method, and belongs to the field of environmental monitoring. The plant boundary low-concentration benzene series online monitoring system comprises the following parts: an atmospheric sampling header pipe; a chromatographic analyzer communicated with the atmospheric sampling header pipe, wherein a quantitative loop, a chromatographic column and an FID flame ionization detector are arranged in the chromatographic analyzer; a gas source unit that comprises a hydrogen generator, a nitrogen generator and a zero gas generator which are used for respectively transmitting hydrogen, nitrogen and zero gas to the chromatographic analyzer. The chromatographic column is used for separating and conveying benzene series in the sample gas; the chromatographic analyzer further comprises a catalytic tube which is a heating tube with a built-in catalyst, one end of the catalytic tube is communicated with the chromatographic column, and the other end of the catalytic tube is communicated with the FID flame ionization detector and used for catalytically decomposing the benzene series into methane. The catalytic tube is additionally arranged in the chromatographic analyzer, the benzene series to be detected are catalytically decomposed into the methane component for detection, so the detection difficulty of the low-concentration benzene series is reduced, the detection result synchronism is high, and the detection analysis result accuracy is high.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, and more specifically relates to an on-line monitoring system and an on-line monitoring method for low-concentration benzene series at the factory boundary. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) refer to organic compounds with a saturated vapor pressure greater than 133.32Pa at normal temperature and a boiling point below 50-260°C at normal pressure, or organic solids or liquids that can volatilize at normal temperature and pressure. VOCs are the most common pollutants emitted by industries such as petrochemical, pharmaceutical, printing, shoemaking and spray painting. These substances mainly include hydrogen sulfide, mercaptans, ammonia, amines, nitro compounds, hydrocarbons, fatty acids, alcohols, phenols, esters and organic halogen derivatives. Most of these organic substances are toxic, and some have been listed as carcinogens, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/08G01N30/88G01N30/68G01N30/06
CPCG01N30/02G01N30/08G01N30/88G01N30/68G01N30/06G01N2030/884
Inventor 王慎储岳喜储岳海朱传亮叶文飞刘泽明王智慧张娟
Owner 马鞍山市桓泰环保设备有限公司
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