CN111879844A - Method for detecting multiple components in gaseous pollutants - Google Patents

Method for detecting multiple components in gaseous pollutants Download PDF

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CN111879844A
CN111879844A CN202010682693.2A CN202010682693A CN111879844A CN 111879844 A CN111879844 A CN 111879844A CN 202010682693 A CN202010682693 A CN 202010682693A CN 111879844 A CN111879844 A CN 111879844A
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detector
content
carbon dioxide
gaseous
multiple components
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CN111879844B (en
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祝家健
华道柱
谢耀
齐宇
陈志强
谢志平
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Concentrating Technology Hangzhou Co ltd
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Concentrating Technology Hangzhou Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention provides a method for detecting multiple components in gaseous pollutants, which comprises the following steps: the gaseous pollutants enter a first detector and a second detector respectively, and the first detector obtains the content C of the total hydrocarbonTHCThe second detector obtains the carbon dioxide content by using an absorption spectrum technology
Figure DDA0002586414470000011
The gaseous pollutants enter the conversion unit, wherein the non-methane total hydrocarbon is converted into carbon dioxide, and the carbon monoxide is converted into carbon dioxide; the first detector obtains the methane content C in the output gas of the conversion unitCH4The second detector obtains the carbon dioxide content in the gas
Figure DDA0002586414470000012
Obtaining carbon monoxide from gaseous pollutantsContent (wt.)
Figure DDA0002586414470000013
Figure DDA0002586414470000014
Is (C)THC‑CCH4) Carbon content in (c) corresponds to the carbon dioxide content. The invention has the advantages of small error and the like.

Description

Method for detecting multiple components in gaseous pollutants
Technical Field
The invention relates to gas detection, in particular to a method for detecting multiple components in gaseous pollutants.
Background
CO and CO2It is generally detected using NDIR techniques with different bandwidths, depending on its characteristic absorption spectrum. However, in practical applications, CO and CO2Detecting the presence of cross-interference; and CO is more susceptible to H in the sample gas2Interference of O.
NDIR can be used to measure CH4However, the method is not suitable for THC and NMHC measurement due to the complexity of smoke components. There are reports of deep oxidation of NMHC to CO using catalysts2And H2O, measuring CO before and after oxidation with NDIR detector2The difference of (A) to (B) is used to convert the detected NMHC, but CO in the gaseous pollutants is also oxidized into CO2CO conversion to CO2It is also considered as NMHC conversion, accounting for NMHC concentration. As can be seen, NDIR is used to measure CO2The method of detecting NMHC using the difference of (a) has a disadvantage in that, in view of this, the FID method which hardly responds to inorganic substances is generally used for NMHC detection.
CO、CO2、THC、CH4NMHC is a gaseous pollutant routinely monitored at stationary source exhaust. CO/CO measurement at the same point2/CH4the/THC/NMHC needs two principle analytical instruments, and has high cost and small integration level.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the method for detecting the multiple components in the gaseous pollutants, which has the advantages of small error and low cost.
The purpose of the invention is realized by the following technical scheme:
the method for detecting the multiple components in the gaseous pollutants comprises the following steps: :
gaseous stateThe pollutants enter a first detector and a second detector respectively, and the first detector obtains the content C of the total hydrocarbonTHCThe second detector obtains the carbon dioxide content by using an absorption spectrum technology
Figure BDA0002586414450000011
The gaseous pollutants enter the conversion unit, wherein the non-methane total hydrocarbon is converted into carbon dioxide, and the carbon monoxide is converted into carbon dioxide;
the first detector obtains the methane content C in the output gas of the conversion unitCH4The second detector obtains the carbon dioxide content in the gas
Figure BDA0002586414450000021
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure BDA0002586414450000022
Is (C)THC-CCH4) Carbon content in (c) corresponds to the carbon dioxide content.
Compared with the prior art, the invention has the beneficial effects that:
1. the error is small;
carbon monoxide is not directly detected any more, but carbon monoxide is converted into carbon dioxide, so that the interference of carbon dioxide and water on carbon monoxide detection is effectively prevented, and the detection error of carbon monoxide is remarkably improved;
2. the operation cost is low;
the detection of the non-methane total hydrocarbon does not need to be provided with devices such as a chromatographic column, a quantitative ring, a multi-way valve and the like, and is replaced by a conversion unit, so that the operation cost is reduced;
the detection of multiple components only needs one set of instrument, thus obviously reducing the cost.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a flow chart of a method for detecting multiple components in a gaseous pollutant according to example 1 of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 is a schematic structural diagram of a method for detecting multiple components in a gaseous pollutant according to an embodiment of the present invention, and as shown in fig. 1, the method for detecting multiple components in a gaseous pollutant includes:
the gaseous pollutants directly enter a first detector and a second detector respectively, and the first detector obtains the content C of the total hydrocarbonTHCThe second detector obtains the carbon dioxide content by using an absorption spectrum technology
Figure BDA0002586414450000031
The gaseous pollutants enter a conversion unit, such as catalytic reaction, wherein non-methane total hydrocarbon is converted into carbon dioxide, and carbon monoxide is converted into carbon dioxide;
the first detector obtains the methane content C in the output gas of the conversion unitCH4The second detector obtains the carbon dioxide content in the gas
Figure BDA0002586414450000032
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure BDA0002586414450000033
Is a non-methane total hydrocarbon (C)THC-CCH4) Carbon content in (c) corresponds to the carbon dioxide content.
In order to reduce the detection error, further, the gaseous pollutants enter the first detector and the second detector respectively without chemical change, so as to obtain the content C respectivelyTHCAnd
Figure BDA0002586414450000034
to improve the implementability, further, the gaseous pollutants are switched so as to selectively pass through the conversion unit or directly into the first detector and the second detector.
In order to convert carbon monoxide and non-methane total hydrocarbons in the gas pollutants into carbon dioxide to avoid the interference of detection, the conversion unit is further provided with a Cu-Mn composite oxide at the temperature of 210-250 ℃.
To improve the detection accuracy, further, the first detector is a FID detector and the second detector is an NDIR detector.
In order to improve the feasibility, the input ends of the first detector and the second detector are selectively communicated with the conversion unit and directly communicated with the gas pollutants through switching.
Example 2:
an application example of the method for detecting multiple components in gaseous pollutants according to embodiment 1 of the present invention.
In this application example, the first detector is an FID detector, the second detector is an NDIR detector, and these detectors are all the prior art in the field, and the specific mechanism and operation mode are not described herein again; the first switching module employs valves to allow the gas contaminants to selectively enter the switching unit or directly enter the detector without chemical change; the second switching module adopts a valve, so that the input ends of the (FID detector and the NDIR detector) detectors are selectively connected with the output end of the conversion unit and the first switching module; the conversion unit is internally provided with Cu-Mn composite oxide at the temperature of 210-250 ℃.
The method for detecting the multiple components in the gaseous pollutants comprises the following steps:
by switching, the gaseous pollutants pass through the first switching module and the second switching module respectively, so that the gaseous pollutants directly enter the FID detector and the NDIR detector without chemical change, and the FID detector obtains the content C of the total hydrocarbonsTHCThe NDIR detector obtains the content of carbon dioxide by using an absorption spectrum technology
Figure BDA0002586414450000041
The gaseous pollutants enter a conversion unit for catalytic reaction, wherein the non-methane total hydrocarbon is converted into carbon dioxide, and the carbon monoxide is converted into carbon dioxide;
the FID detector obtains the methane content C in the output gas of the conversion unitCH4NDIR detector to obtain the carbon dioxide content of said gas
Figure BDA0002586414450000042
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure BDA0002586414450000043
Is a non-methane total hydrocarbon (C)THC-CCH4) Carbon content in (c) corresponds to the carbon dioxide content.

Claims (6)

1. The method for detecting the multiple components in the gaseous pollutants comprises the following steps: :
the gaseous pollutants enter a first detector and a second detector respectively, and the first detector obtains the content C of the total hydrocarbonTHCThe second detector obtains the carbon dioxide content by using an absorption spectrum technology
Figure FDA0002586414440000011
The gaseous pollutants enter the conversion unit, wherein the non-methane total hydrocarbon is converted into carbon dioxide, and the carbon monoxide is converted into carbon dioxide;
the first detector obtains the methane content C in the output gas of the conversion unitCH4The second detector obtains the carbon dioxide content in the gas
Figure FDA0002586414440000012
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure FDA0002586414440000013
Figure FDA0002586414440000014
Is and (C)THC-CCH4) Carbon content in (c) corresponds to the carbon dioxide content.
2. The method of claim 1 for detecting multiple components in a gaseous pollutant, comprising: the gaseous pollutant enters a first detector and a second detector respectively without chemical change, so that the content C is obtained respectivelyTHCAnd
Figure FDA0002586414440000015
3. the method of claim 1 for detecting multiple components in a gaseous pollutant, comprising: the gaseous contaminants are switched so as to selectively pass through the conversion unit and directly enter the first detector and the second detector.
4. The method of claim 1 for detecting multiple components in a gaseous pollutant, comprising: the conversion unit is internally provided with a Cu-Mn composite oxide, and the temperature is 210-250 ℃.
5. The method of claim 4 for detecting multiple components in a gaseous pollutant, comprising: the first detector is a FID detector and the second detector is an NDIR detector.
6. The method of claim 1 for detecting multiple components in a gaseous pollutant, comprising: by switching, the input ends of the first detector and the second detector are selectively communicated with the conversion unit and directly communicated with the gas pollutants.
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Citations (5)

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CN103616521A (en) * 2013-10-21 2014-03-05 天津世纪动力科技发展有限公司 Exhaust pollutant measuring system for in-use vehicle
CN104849374A (en) * 2015-06-11 2015-08-19 广东俐峰环保科技有限公司 Non-methane hydrocarbon analysis equipment and method
CN105717065A (en) * 2016-04-07 2016-06-29 南京波腾科技工程有限公司 Continuous monitoring device for non-methane total hydrocarbon and working method of continuous monitoring device
CN110036271A (en) * 2016-12-08 2019-07-19 株式会社堀场制作所 Gas analyzing apparatus and analysis method for gases
CN110411972A (en) * 2019-08-30 2019-11-05 中国科学院大学 A kind of method of general volatile organic pollutant and non-methane total hydrocarbons concentration in while detection gas

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
CN103616521A (en) * 2013-10-21 2014-03-05 天津世纪动力科技发展有限公司 Exhaust pollutant measuring system for in-use vehicle
CN104849374A (en) * 2015-06-11 2015-08-19 广东俐峰环保科技有限公司 Non-methane hydrocarbon analysis equipment and method
CN105717065A (en) * 2016-04-07 2016-06-29 南京波腾科技工程有限公司 Continuous monitoring device for non-methane total hydrocarbon and working method of continuous monitoring device
CN110036271A (en) * 2016-12-08 2019-07-19 株式会社堀场制作所 Gas analyzing apparatus and analysis method for gases
CN110411972A (en) * 2019-08-30 2019-11-05 中国科学院大学 A kind of method of general volatile organic pollutant and non-methane total hydrocarbons concentration in while detection gas

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