CN112666108B - Method for detecting mixed gas after pyrolysis of environment-friendly gas by infrared spectrum - Google Patents
Method for detecting mixed gas after pyrolysis of environment-friendly gas by infrared spectrum Download PDFInfo
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- CN112666108B CN112666108B CN202011362994.3A CN202011362994A CN112666108B CN 112666108 B CN112666108 B CN 112666108B CN 202011362994 A CN202011362994 A CN 202011362994A CN 112666108 B CN112666108 B CN 112666108B
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Abstract
The invention discloses a method for detecting mixed gas after pyrolysis of environment-friendly gas by infrared spectrum, which comprises the following steps: the gas impurities in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber are pumped by the repeated vacuum pump; introducing the measured sample gas into the first air chamber, and opening a carrier gas valve to introduce helium into each air chamber so as to balance the air pressure; opening a first valve to introduce the gas in the first gas chamber into the sample cell for infrared detection, and repeating the operation of the next gas chamber until the infrared detection of the gas in each gas chamber is completed; respectively carrying out contrast analysis on the measured infrared spectrograms, and qualitatively analyzing specific substances in the mixed gas through standard gas; extracting the gas in each gas chamber through a vacuum pump; helium is introduced into each air chamber and is dried and stored after the helium reaches equilibrium. The method reduces the interference of various products on qualitative analysis of the infrared spectrogram, so as to meet the requirement of scientific researchers on analysis and research of the products under the condition of limited measuring instruments.
Description
Technical Field
The invention relates to the field of detection and analysis of environment-friendly gas and mixed gas after pyrolysis, in particular to a method for detecting the mixed gas after pyrolysis of the environment-friendly gas by using infrared spectrum.
Background
Environment-friendly insulating gas C 4 F 7 N、C 5 F 10 O、C 6 F 12 O is required to be mixed with buffer gas CO when used as an insulating medium in electrical equipment 2 、N 2 Etc., and detecting that the decomposition products of the mixed gases at high temperature are environment-friendly insulating gases instead of SF 6 As an important link in the research of insulating media. The problem of doping other gases exists in the current experiment process, and the mixed gas doped with the other gases produces interference on qualitative analysis of an infrared spectrogram, so that the accuracy of an experiment result is seriously affected.
Disclosure of Invention
Aiming at the defects of the prior art, the patent provides a method for detecting the mixed gas after pyrolysis of the environment-friendly gas by using infrared spectrums, which reduces the interference of various product types on qualitative analysis of the infrared spectrums so as to meet the requirement of scientific researchers on analysis and research of the products under the condition of limited measuring instruments.
In order to achieve the above purpose, the invention provides a method for detecting a mixed gas after pyrolysis of an environmental protection gas by using infrared spectrum, which comprises the following steps:
the gas impurities in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber are pumped by the repeated vacuum pump;
introducing the tested sample gas into the first air chamber, and opening a carrier gas valve to introduce helium into the second air chamber, the third air chamber and the fourth air chamber so as to balance the air pressure;
opening a first valve to enable gas in the first air chamber to be introduced into a sample pool for infrared detection, opening a second valve to enable gas in the second air chamber to be subjected to infrared detection, and repeating the operation until the infrared detection of the gas in the first air chamber, the second air chamber, the third air chamber and the fourth air chamber is completed;
respectively carrying out contrast analysis on infrared spectrograms measured by the first air chamber, the second air chamber, the third air chamber and the fourth air chamber, and qualitatively analyzing specific substances in the mixed gas through standard gas;
extracting the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber through the vacuum pump;
helium is introduced into the first air chamber, the second air chamber, the third air chamber and the fourth air chamber, and is dried and stored after the helium reaches balance.
As a preferred embodiment of the present invention, the reusable vacuum pump separates gas impurities in the first, second, third and fourth chambers, and further comprises:
opening an automatic control valve, pumping helium in the first air chamber, the second air chamber, the third air chamber and the fourth air chamber by using the vacuum pump until the number of the barometric pressure indicators is negative standard atmospheric pressure,
as a preferable technical scheme of the invention, the top end of the first section tube, the bottom end of the second section tube, the top end of the second section tube, the bottom end of the third section tube, the top end of the third section tube, the bottom end of the fourth section tube, the top end of the fourth section tube and the bottom end of the fifth section rod are respectively symmetrically provided with two elastic rollers.
As a preferred technical solution of the present invention, the measured sample gas is introduced into the first gas chamber, and helium is introduced into the second gas chamber, the third gas chamber and the fourth gas chamber by opening a carrier gas valve to balance the gas pressure, and the method further includes:
closing the automatic control valve, opening the carrier gas valve, introducing helium, closing the carrier gas valve after a period of time, and vacuumizing when the first air pressure gauge, the second air pressure gauge, the third air pressure gauge and the fourth air pressure gauge reach balance, repeating the steps for three times, thereby achieving the purpose of removing gas impurities from the surfaces of the first air chamber, the second air chamber, the third air chamber, the fourth air chamber and the molecular sieve.
As a preferred technical scheme of the present invention, the opening of the first valve to allow the gas in the first gas chamber to enter the sample cell for infrared detection, and then opening of the second valve to allow the gas in the second gas chamber to be detected in an infrared manner, and repeating the operation until the infrared detection of the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber is completed, further comprising:
opening the first valve to enable the gas in the first air chamber to be introduced into the sample tank for infrared detection, opening the second valve to enable the gas in the second air chamber to be subjected to infrared detection after detection is completed, opening the third valve to enable the gas in the third air chamber to be introduced into the sample tank for infrared detection, and opening the fourth valve to enable the gas in the fourth air chamber to be subjected to infrared detection after detection is completed.
As a preferred technical solution of the present invention, the comparing and analyzing the infrared spectrograms measured by the first air chamber, the second air chamber, the third air chamber and the fourth air chamber respectively, and qualitatively analyzing specific substances in the mixed gas by using standard gas, wherein the method further includes:
and comparing and analyzing infrared spectrograms measured by the gases in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber, and qualitatively analyzing specific substances in the mixed gas through standard gases.
As a preferable mode of the present invention, the pumping of the gas in the first gas chamber, the second gas chamber, the third gas chamber, and the fourth gas chamber by the vacuum pump further includes:
and opening the automatic control valve to vacuumize the first air chamber, the second air chamber, the third air chamber and the fourth air chamber after detection is completed.
As a preferable technical solution of the present invention, the drying and preserving after the helium gas is introduced into the first air chamber, the second air chamber, the third air chamber and the fourth air chamber and balanced, further includes:
and opening the carrier gas valve to introduce helium into the air chamber, and placing the gas separation device into a dry environment for preservation when the air pressure of each level of air chamber is expressed to be balanced.
As a preferable technical scheme of the invention, the method for detecting the mixed gas after pyrolysis of the environment-friendly gas by infrared spectrum further comprises the following steps:
an impurity removal system for pumping the gaseous impurities in the first, second, third and fourth chambers using a vacuum pump repeatedly;
the stable air pressure system is used for introducing the measured sample gas into the first air chamber, and opening a carrier gas valve to introduce helium gas into the second air chamber, the third air chamber and the fourth air chamber so as to balance the air pressure;
the infrared detection system is used for opening a first valve to enable the gas in the first gas chamber to be led into the sample cell for infrared detection, then opening a second valve to enable the gas in the second gas chamber to be subjected to infrared detection, and repeating the operation until the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber is subjected to infrared detection;
the infrared spectrogram analysis system is used for respectively carrying out contrast analysis on infrared spectrograms measured by the first air chamber, the second air chamber, the third air chamber and the fourth air chamber, and qualitatively analyzing specific substances in the mixed gas through standard gas;
the gas recovery system is used for extracting the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber through the vacuum pump;
and the preservation system is used for drying and preserving after helium is introduced into the first air chamber, the second air chamber, the third air chamber and the fourth air chamber and reaches balance.
In summary, the invention adopts the technical scheme, and has the following technical effects: the gas sample is introduced into the gas separation device to be separated according to the molecular diameter of the gas sample, the separated gas is sequentially introduced into the sample cell to be subjected to infrared spectrum detection to obtain an infrared spectrum of the corresponding gas, and finally, the obtained infrared spectrum is compared to carry out accurate qualitative analysis on the mixed gas, so that the interference of various product types on the qualitative analysis of the infrared spectrum is reduced, and the requirement of scientific researchers on analysis and research on the product under the condition of limited measuring instruments is met.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the operation of the method for detecting mixed gas after pyrolysis of environmental friendly gas involving infrared spectrum according to the present invention;
FIG. 2 is a schematic diagram of the product separation apparatus of the present invention after pyrolysis of an environmentally friendly mixed gas.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments may be combined with each other without conflict.
Referring to fig. 1 and 2, fig. 1 shows an operation flowchart of the method for detecting a mixed gas after pyrolysis of an environmental protection gas by using infrared spectrum according to the present invention; fig. 2 shows a schematic diagram of the product separation device after pyrolysis of the environment-friendly mixed gas.
Specifically, the method for detecting the mixed gas after pyrolysis of the environment-friendly gas by using the infrared spectrum, which is shown in the embodiment of the invention, comprises a set of device for separating the product after pyrolysis of the environment-friendly mixed gas, wherein the device comprises a first gas chamber 11, a second gas chamber 12, a third gas chamber 13 and a fourth gas chamber 14, molecular sieve gas separation membranes 17 are arranged at the bottom ends of the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14, and the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14 are sequentially stacked from top to bottom.
Further, a carrier gas valve 15 and a sample gas valve 16 are disposed at the upper end of the first air chamber 11, and a first air pressure gauge 21 and a first valve 22 are disposed on the right side of the first air chamber 11. The first air chamber 11 is connected to the sample cell 19 via a first valve 22.
Further, a second barometer 23 and a second valve 24 are provided on the right side of the second air chamber 12. The second air chamber 12 is connected to the sample cell 19 via a second valve 24.
Further, a third barometer 25 and a third valve 26 are provided on the right side of the third air chamber 13. The third air chamber 13 is connected to the sample cell 19 via a third valve 26.
Further, a fourth barometer 27 and a fourth valve 28 are provided on the right side of the fourth air chamber 14. The fourth air chamber 14 is connected to the sample cell 19 via a fourth valve 28.
Further, automatic control valves 29 are provided correspondingly to the left sides of the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14, respectively, and the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14 are connected to the vacuum pump 18 based on the automatic control valves 29, respectively.
Further, the first air chamber 11 is connected with a helium storage tank based on a carrier gas air valve 15; the first air chamber 11 is connected with the sample to be measured based on the sample air valve 16.
Further, the first air chamber 11 is connected with the helium storage tank based on the carrier gas air valve 15, helium is introduced into the first air chamber 11, the air pressure of the air chamber is balanced through helium, the air chamber is prevented from being affected by damp, the helium is introduced into the air chamber after each detection is completed, a certain indication number is required for the air pressure meter of each level of air chamber, and meanwhile, when the air chamber is vacuumized to remove impurities of each level of air chamber, residual sample impurities adsorbed on the molecular sieve can be stripped. Helium has stable chemical property, small molecular diameter and difficult adsorption by molecular sieves, and can permeate into all stages of air chambers.
Further, an automatic control valve 29 is provided, because the air chambers need to be vacuumized before and after the infrared detection is completed, the vacuum pump 18 is connected with each air chamber, the interruption of the vacuum pump is controlled through the relay equipment, and the test failure caused by artificial negligence is effectively avoided through the control of the relay equipment.
Further, the automatic control valve 29 is connected with the air chamber, and the vacuum pump 18 can vacuumize the air chamber to remove residual impurity gas in each level of air chamber, so that the accuracy and reliability of experimental results are ensured.
Further, the device is divided into a first air chamber 11, a second air chamber 12, a third air chamber 13 and a fourth air chamber 14, mixed gas is separated in the environment, the higher the number of the air chamber stages is, the smaller the diameter of the separated gas in the air chamber is, the larger the concentration difference between the front air chamber and the rear air chamber is when different gases enter the next air chamber through a molecular sieve gas separation membrane 17, and in order to make the concentration of the gases in the front air chamber and the rear air chamber reach equilibrium as soon as possible, the volume of the next air chamber is smaller than the volume of the last air chamber.
Further, the molecular sieve gas separation membrane 17 is an artificially synthesized hydrated aluminosilicate or natural zeolite with molecular sieving function, which structurally has a plurality of pore channels with uniform pore diameters and orderly arranged pores, molecular sieves with different pore diameters separate molecules with different sizes and shapes, and molecular sieves with different pore diameters are obtained according to different molecular ratios of SiO2 and Al2O3, and the size of the molecular sieve adopted in the device is reduced along with the increase of the gas chamber level.
Further, the first, second, third and fourth barometers 21, 23, 25 and 27 react to the change of the air pressure of the air chamber, and when the air pressure value of each stage of air chamber is not changed any more, it can be judged that the separation of the mixed gas is completed.
Further, the first valve 22, the second valve 24, the third valve 26 and the fourth valve 28 are sequentially opened to enable the gas of each gas chamber to be introduced into the sample cell 19 for infrared detection, the next valve is opened for sample detection after the gas sample of one gas chamber is detected, the time for opening each time is not too long, and the gas pressure difference between the gas chambers of two adjacent grades is high due to the fact that the gas is introduced into the sample cell 19 for a long time, so that the molecular sieve gas separation membrane 17 is damaged.
The device can selectively separate the mixed gas based on the membrane separation technology, and has selective permeation effect on gas molecules with different diameters according to molecular sieve membranes with different sizes. Through the operation of this device can separate the gas molecule of equidimension not, lets in sample cell 19 in proper order with the gas of separation and carries out infrared detection, can reduce the probability that the peak overlaps in the infrared spectrogram that obtains like this, convenient qualitative analysis.
Specifically, the method for detecting the mixed gas after pyrolysis of the environment-friendly gas by using the infrared spectrum comprises the following steps of:
the vacuum pump 18 is repeatedly used to pump out the gas impurities 1 in the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14;
introducing the tested sample gas into the first gas chamber 11, and opening a carrier gas valve to introduce helium into the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14 so as to balance the gas pressure to 2;
opening a first valve 22 to enable the gas in the first gas chamber 11 to enter a sample cell 19 for infrared detection, opening a second valve 24 to enable the gas in the second gas chamber 12 to be detected in an infrared mode, and repeating the operation until the infrared detection of the gas in the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14 is completed 3;
respectively carrying out contrast analysis on infrared spectrograms measured by the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14, and qualitatively analyzing specific substances 4 in the mixed gas through standard gas;
extracting 5 the gas in the first, second, third and fourth gas chambers 11, 12, 13, 14 by means of the vacuum pump 18;
helium is introduced into the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14, and the air is dried and stored 6 after the air reaches equilibrium.
Specifically, the reusable vacuum pump 18 pumps out the gas impurities 1 in the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14, and further includes:
the automatic control valve 29 is opened, and helium gas in the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14 is pumped out by using the vacuum pump 18 until the air pressure gauge is negative standard atmospheric pressure.
Specifically, the sample gas to be tested is introduced into the first gas chamber 11, and helium gas is introduced into the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14 by opening a carrier gas valve to balance the gas pressure to 2, which further includes:
closing the automatic control valve 29, opening the carrier gas valve 15, introducing helium, closing the carrier gas valve 15 after a period of time, and vacuumizing when the numbers of the first air pressure gauge 21, the second air pressure gauge 23, the third air pressure gauge 25 and the fourth air pressure gauge 27 reach balance, and repeating the above steps for three times to achieve the purpose of removing gas impurities from the surfaces of the first air chamber 11, the second air chamber 12, the third air chamber 13, the fourth air chamber 14 and the molecular sieve.
Specifically, the opening of the first valve 22 to allow the gas in the first gas chamber 11 to flow into the sample cell 19 for infrared detection, then opening of the second valve 24 to allow the gas in the second gas chamber 12 to flow into the next gas chamber, and repeating the operation until the infrared detection of the gas in the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14 is completed 3, which further includes:
opening the first valve 22 to allow the gas in the first gas chamber 11 to flow into the sample cell 19 for infrared detection, opening the second valve 24 to allow the gas in the second gas chamber 12 to flow into the sample cell 19 for infrared detection after detection, opening the third valve 26 to allow the gas in the third gas chamber 13 to flow into the sample cell 19 for infrared detection, and opening the fourth valve 28 to allow the gas in the fourth gas chamber 14 to flow into the sample cell 19 for infrared detection after detection.
Specifically, the comparing and analyzing the infrared spectrograms measured by the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14 respectively, and qualitatively analyzing the specific substance 4 in the mixed gas by using the standard gas, which further includes:
and comparing and analyzing infrared spectrograms measured by the gases in the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14, and qualitatively analyzing specific substances in the mixed gas through standard gases.
Specifically, the pumping 5 of the gases in the first gas chamber 11, the second gas chamber 12, the third gas chamber 13 and the fourth gas chamber 14 by the vacuum pump 18 further includes:
after the detection, the automatic control valve 29 is opened to vacuumize the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14.
Specifically, the drying and preserving 6 after helium is introduced into the first air chamber 11, the second air chamber 12, the third air chamber 13 and the fourth air chamber 14 and balanced, and further includes:
and opening the carrier gas valve 15 to introduce helium into the air chamber, and placing the gas separation device into a dry environment for preservation when the air pressure of each level of air chamber is expressed to be balanced.
According to the invention, the gas sample is introduced into the gas separation device to be separated according to the molecular diameter of the gas sample, and then the separated gas is sequentially introduced into the sample cell to be subjected to infrared spectrum detection to obtain the infrared spectrum of the corresponding gas, and finally, the obtained infrared spectrum is compared to perform accurate qualitative analysis on the mixed gas, so that the interference of various product types on the qualitative analysis of the infrared spectrum is reduced, and the analysis and research on the product by scientific researchers under the condition of limited measuring instruments are met.
The above description of the method for detecting the mixed gas after pyrolysis of the environmental-friendly gas by using infrared spectrum is provided in the embodiment of the present invention, and specific examples should be adopted to illustrate the principle and implementation of the present invention, and the description of the above embodiment is only used to help understand the method and core idea of the present invention; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.
Claims (8)
1. The method for detecting the mixed gas after pyrolysis of the environment-friendly gas by the infrared spectrum is characterized by comprising the following steps of:
the gas impurities in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber are pumped by the repeated vacuum pump;
introducing the tested sample gas into the first air chamber, and opening a carrier gas valve to introduce helium into the second air chamber, the third air chamber and the fourth air chamber so as to balance the air pressure;
opening a first valve to enable gas in the first air chamber to enter a sample cell for infrared detection, opening a second valve to enable gas in the second air chamber to be detected in an infrared mode, and then repeating the operation until the gas in the first air chamber, the second air chamber, the third air chamber and the fourth air chamber is detected in an infrared mode;
respectively carrying out contrast analysis on infrared spectrograms measured by the first air chamber, the second air chamber, the third air chamber and the fourth air chamber, and qualitatively analyzing specific substances in the mixed gas through standard gas;
extracting the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber through the vacuum pump;
helium is introduced into the first air chamber, the second air chamber, the third air chamber and the fourth air chamber, and is dried and stored after the helium reaches balance.
2. The method for detecting mixed gas after pyrolysis of environmental protection gas involving infrared spectroscopy according to claim 1, wherein the reusable vacuum pump pumps gas impurities in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber, further comprising:
and opening an automatic control valve, and pumping helium in the first air chamber, the second air chamber, the third air chamber and the fourth air chamber by using the vacuum pump until the air pressure represents the standard atmospheric pressure with negative number.
3. The method for detecting mixed gas after pyrolysis of environmental protection gas involving infrared spectroscopy according to claim 2, wherein the sample gas to be detected is introduced into the first gas chamber, and helium is introduced into the second gas chamber, the third gas chamber and the fourth gas chamber by opening a carrier gas valve to balance the gas pressure, further comprising:
closing the automatic control valve, opening the carrier gas valve, introducing helium, closing the carrier gas valve after a period of time, and vacuumizing when the first air pressure gauge, the second air pressure gauge, the third air pressure gauge and the fourth air pressure gauge reach balance, repeating the steps for three times, thereby achieving the purpose of removing the gas impurities on the surfaces of the first air chamber, the second air chamber, the third air chamber, the fourth air chamber and the molecular sieve.
4. The method for detecting mixed gas after pyrolysis of environmental protection gas by infrared spectrum according to claim 3, wherein the steps of opening a first valve to introduce the gas in the first gas chamber into a sample cell for infrared detection, opening a second valve to perform infrared detection on the gas in the second gas chamber, and repeating the operation until the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber is detected completely, further comprising:
the right side of the third air chamber is provided with a third air pressure gauge and a third valve, the third air chamber is connected with the sample cell through the third valve, the right side of the fourth air chamber is provided with a fourth air pressure gauge and a fourth valve, and the fourth air chamber is connected with the sample cell through the fourth valve;
opening the first valve to enable the gas in the first air chamber to be introduced into the sample tank for infrared detection, opening the second valve to enable the gas in the second air chamber to be subjected to infrared detection after detection is completed, opening the third valve to enable the gas in the third air chamber to be introduced into the sample tank for infrared detection, and opening the fourth valve to enable the gas in the fourth air chamber to be subjected to infrared detection after detection is completed.
5. The method for detecting a mixed gas after pyrolysis of an environmental protection gas by infrared spectroscopy according to claim 4, wherein the infrared spectrograms measured by the first air chamber, the second air chamber, the third air chamber and the fourth air chamber are respectively compared and analyzed, and specific substances in the mixed gas are qualitatively analyzed by the standard gas, and the method further comprises:
and comparing and analyzing infrared spectrograms measured by the gases in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber, and qualitatively analyzing specific substances in the mixed gas through standard gases.
6. The method for detecting mixed gas after pyrolysis of environmental protection gas involving infrared spectroscopy according to claim 2, wherein the extracting gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber by the vacuum pump, further comprises:
and opening the automatic control valve to vacuumize the first air chamber, the second air chamber, the third air chamber and the fourth air chamber after detection is completed.
7. The method for detecting mixed gas after pyrolysis of environmental protection gas involving infrared spectrum according to claim 6, wherein helium is introduced into the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber and is dried and stored after being balanced, further comprising:
and (3) opening the carrier gas valve to introduce helium into the air chamber, and placing the gas separation device into a dry environment for preservation when the air pressure of each level of air chamber is expressed to be balanced.
8. The method for detecting the mixed gas after the pyrolysis of the environment-friendly gas by the infrared spectrum according to claim 7, wherein the method for detecting the mixed gas after the pyrolysis of the environment-friendly gas by the infrared spectrum further comprises the following steps:
an impurity removal system for pumping the gaseous impurities in the first, second, third and fourth chambers using a vacuum pump repeatedly;
the stable air pressure system is used for introducing the measured sample gas into the first air chamber, and opening a carrier gas valve to introduce helium gas into the second air chamber, the third air chamber and the fourth air chamber so as to balance the air pressure;
the infrared detection system is used for opening a first valve to enable the gas in the first gas chamber to be led into the sample cell for infrared detection, then opening a second valve to enable the gas in the second gas chamber to be subjected to infrared detection, and repeating the operation until the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber is subjected to infrared detection;
the infrared spectrogram analysis system is used for respectively carrying out contrast analysis on infrared spectrograms measured by the first air chamber, the second air chamber, the third air chamber and the fourth air chamber, and qualitatively analyzing specific substances in the mixed gas through standard gas;
the gas recovery system is used for extracting the gas in the first gas chamber, the second gas chamber, the third gas chamber and the fourth gas chamber through the vacuum pump;
and the preservation system is used for drying and preserving after helium is introduced into the first air chamber, the second air chamber, the third air chamber and the fourth air chamber and reaches balance.
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| CN107389585A (en) * | 2017-08-21 | 2017-11-24 | 湖北锐意自控系统有限公司 | A kind of gas analyzer and analysis method for gases |
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