CN111879844B - Method for detecting multiple components in gaseous pollutants - Google Patents

Method for detecting multiple components in gaseous pollutants Download PDF

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CN111879844B
CN111879844B CN202010682693.2A CN202010682693A CN111879844B CN 111879844 B CN111879844 B CN 111879844B CN 202010682693 A CN202010682693 A CN 202010682693A CN 111879844 B CN111879844 B CN 111879844B
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detector
content
carbon dioxide
gaseous
conversion unit
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CN111879844A (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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FOCUSED PHOTONICS (HANGZHOU) Inc
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    • 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
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    • 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
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    • 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
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Abstract

The invention provides a gaseous stateThe method for detecting the multiple components in the 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 hydrocarbon THC The second detector obtains the carbon dioxide content by absorption spectroscopy
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 unit CH4 The second detector obtains the carbon dioxide content in the gas
Figure DDA0002586414470000012
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure DDA0002586414470000013
Figure DDA0002586414470000014
Is (C) THC ‑C CH4 ) Carbon content in (b) 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 CO 2 It is generally detected using NDIR techniques with different bandwidths, depending on its characteristic absorption spectrum. However, in practical applications, CO and CO 2 Detecting the presence of cross-interference; and CO is more susceptible to H in the sample gas 2 And O interference.
NDIR can be used to measure CH 4 However, 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 catalysts 2 And H 2 O, measured before oxidation by means of an NDIR detectorPost CO 2 The difference of (A) to (B) is used to convert the detected NMHC, but CO in the gaseous pollutants is also oxidized into CO 2 CO conversion to CO 2 It is also considered as NMHC conversion, accounting for NMHC concentration. As can be seen, NDIR is used to measure CO 2 The 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、CO 2 、THC、CH 4 NMHC is a gaseous pollutant routinely monitored at the exhaust of stationary pollution sources. CO/CO measurement at the same point 2 /CH 4 the/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:
the gaseous pollutants enter a first detector and a second detector respectively, and the first detector obtains the content C of the total hydrocarbon THC The second detector obtains the carbon dioxide content by using an absorption spectrum technology
Figure GDA0003729523480000011
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 unit CH4 The second detector obtains the carbon dioxide content in the gas
Figure GDA0003729523480000021
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure GDA0003729523480000022
Is (C) THC -C CH4 ) 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 is converted into carbon dioxide, so that the interference of carbon dioxide and water on the detection of carbon monoxide 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.
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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 solution 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 use the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the technical solutions of the present invention. Those skilled in the art will appreciate variations or substitutions from these embodiments that 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 hydrocarbon THC The second detector obtains the carbon dioxide content by using an absorption spectrum technology
Figure GDA0003729523480000031
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 unit CH4 Said second detector obtaining the carbon dioxide content of said gas
Figure GDA0003729523480000032
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure GDA0003729523480000033
Is a non-methane total hydrocarbon (C) THC -C CH4 ) Carbon content in (c) corresponds to the carbon dioxide content.
In order to reduce the detection error, further, the gaseous pollutant enters the first detector and the second detector respectively without chemical change, thereby obtaining the content C respectively THC And
Figure GDA0003729523480000034
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 hydrocarbons THC The NDIR detector obtains the content of carbon dioxide by using an absorption spectrum technology
Figure GDA0003729523480000041
The gaseous pollutants enter a conversion unit for catalytic reaction, wherein the non-methane total hydrocarbons are 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 unit CH4 NDIR detector to obtain the carbon dioxide content of said gas
Figure GDA0003729523480000042
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure GDA0003729523480000043
Is a non-methane total hydrocarbon (C) THC -C CH4 ) 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 hydrocarbon THC The second detector obtains the carbon dioxide content by using an absorption spectrum technology
Figure DEST_PATH_IMAGE001
；
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 unit CH4 The second detector obtains the carbon dioxide content in the gas
Figure 243520DEST_PATH_IMAGE002
；
Obtaining the content of carbon monoxide in the gaseous pollutants
Figure DEST_PATH_IMAGE003
，
Figure 819821DEST_PATH_IMAGE004
Is a non-methane total hydrocarbon (C) THC -C CH4 ) Carbon content in (c) corresponds to the carbon dioxide content.
2. The method of claim 1 whereinThe method for detecting components is characterized in that: the gaseous pollutant enters a first detector and a second detector respectively without chemical change, so that the content C is obtained respectively THC And
Figure 571876DEST_PATH_IMAGE001
。
3. the method for detecting multiple components in a gaseous pollutant according to claim 1, characterized in that: the gaseous contaminants are switched so as to selectively pass through the conversion unit and then pass to and directly into the first and second detectors, respectively.
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 for detecting multiple components in a gaseous pollutant according to claim 4, wherein: 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 at the same time or directly communicated with the gaseous pollutants at the same time.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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* Cited by examiner, † Cited by third party
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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
CN104849374B (en) * 2015-06-11 2016-09-28 广东俐峰环保科技有限公司 NMHC analytical equipment and method
WO2018105169A1 (en) * 2016-12-08 2018-06-14 株式会社堀場製作所 Gas analyzing device and gas analyzing method
CN110411972B (en) * 2019-08-30 2021-11-30 中国科学院大学 Method for simultaneously detecting concentration of total volatile organic pollutants and non-methane total hydrocarbon in gas

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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