CN211505362U - System for eliminating gas chromatography oxygen peak interference - Google Patents
System for eliminating gas chromatography oxygen peak interference Download PDFInfo
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- CN211505362U CN211505362U CN201922084484.3U CN201922084484U CN211505362U CN 211505362 U CN211505362 U CN 211505362U CN 201922084484 U CN201922084484 U CN 201922084484U CN 211505362 U CN211505362 U CN 211505362U
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Abstract
The present disclosure relates to a system for eliminating gas chromatography oxygen peak interference. The system for eliminating the interference of the oxygen peak of the gas chromatograph comprises: the target gas circuit comprises a first quantitative ring and a first chromatographic column connected with the first quantitative ring, and the first chromatographic column is used for separating a target; the oxygen gas circuit comprises a second quantitative ring and a second chromatographic column connected with the second quantitative ring, and the second chromatographic column is used for separating oxygen; the detector is respectively connected with the first chromatographic column and the second chromatographic column and is used for detecting the peak area of a target object and the oxygen peak area of the gas; and the calculating unit is connected with the detector and determines the content of the target object of the gas according to the peak area of the target object and the oxygen peak area. According to the system for eliminating the gas chromatography oxygen peak interference, the target object peak area and the oxygen peak area are determined according to the sample gas in the same detection period, the content of the target object in the sample gas is obtained, and the monitoring accuracy is improved.
Description
Technical Field
The disclosure belongs to the field of environmental protection, and particularly relates to a system for eliminating gas chromatography oxygen peak interference.
Background
An on-line gas chromatograph (FID) for non-methane total hydrocarbon monitoring in stationary sources of pollution or ambient air, oxygen has a certain response on both its total hydrocarbon column and methane column. According to related standards, when non-methane total hydrocarbon monitoring data is processed, the adopted method is to use the hydrocarbon-removing air as a blank sample to obtain an oxygen peak of the hydrocarbon-removing air, the total hydrocarbon content of the sample is a calculation result of subtracting the oxygen peak area of the hydrocarbon-removing air from the total hydrocarbon peak area of the sample, and the difference value of the total hydrocarbon content and the methane content of the sample is the non-methane total hydrocarbon content.
However, in practical production conditions, the oxygen content in the sample is much lower than that in air due to the requirement of the volatile organic compound treatment process. Moreover, the content of each component of the sampling point is dynamically changed, including the oxygen content in the sample gas, which inevitably causes the change of the chromatographic peak area including the oxygen peak area (blank sample), and the accuracy of the monitoring result is inevitably influenced by adopting the oxygen peak of the hydrocarbon-removed air as the blank sample to process all the monitoring results.
SUMMERY OF THE UTILITY MODEL
The disclosure aims to provide a system for eliminating gas chromatography oxygen peak interference, which can obtain a target object peak area and an oxygen peak area in a detection period, and can determine the content of a target object in a sample gas more accurately.
The present disclosure provides a system for eliminating interference of gas chromatography oxygen peaks, comprising: the target gas circuit comprises a first quantitative ring and a first chromatographic column connected with the first quantitative ring, and the first chromatographic column is used for separating a target; the oxygen gas circuit comprises a second quantitative ring and a second chromatographic column connected with the second quantitative ring, and the second chromatographic column is used for separating oxygen; the detector is respectively connected with the first chromatographic column and the second chromatographic column and is used for detecting the peak area of a target object and the oxygen peak area of the gas; and the calculating unit is connected with the detector and determines the target object content of the gas according to the target object peak area and the oxygen peak area.
According to some embodiments of the present disclosure, the system for eliminating interference of gas chromatography oxygen peaks further comprises: the first valve body comprises a sample gas inlet, a first carrier gas inlet, a second carrier gas inlet and a first exhaust port, the first quantitative ring is connected with the first valve body, the first valve body is connected with the first chromatographic column, and the second quantitative ring is connected with the first valve body; and the second valve body is connected with the first valve body, the second chromatographic column is connected with the second valve body, and the second valve body is connected with the detector.
According to some embodiments of the present disclosure, the second valve body further comprises a third carrier gas inlet and a second exhaust port.
According to some embodiments of the present disclosure, the detector includes a combustion gas inlet and an oxidant gas inlet.
The present disclosure also provides a method for eliminating interference of gas chromatography oxygen peaks, comprising: introducing sample gas into the first quantitative ring and the second quantitative ring; introducing carrier gas into the first quantitative ring, wherein the carrier gas carries the sample gas in the first quantitative ring to enter a first chromatographic column, and the first chromatographic column separates a target object in the sample gas; the carrier gas carries the separated target object to enter a detector for detection, and the peak area of the target object is determined; introducing carrier gas into the second quantitative ring, wherein the carrier gas carries the sample gas in the second quantitative ring to enter a second chromatographic column, and the second chromatographic column separates oxygen in the sample gas; the carrier gas carries the separated oxygen to enter the detector for detection, and the oxygen peak area is determined; and determining the target object content of the sample gas according to the target object peak area and the oxygen peak area.
According to some embodiments of the disclosure, the passing the sample gas into the first dosing ring and the second dosing ring comprises: and the sample gas enters the first quantitative ring and the second quantitative ring through a sample gas inlet of the first valve body.
According to some embodiments of the disclosure, the passing a carrier gas into the first dosing ring comprises: the carrier gas enters the first dosing ring through a first carrier gas inlet of the first valve body.
According to some embodiments of the present disclosure, the passing a carrier gas into the second quantitative ring, the carrier gas carrying the sample gas in the second quantitative ring into the second chromatographic column comprises: the carrier gas enters the second quantitative ring through a second carrier gas inlet of the first valve body; and the carrier gas carries the sample gas in the second quantitative ring to enter the second chromatographic column through a second valve body.
According to some embodiments of the present disclosure, the carrier gas carrying the separated oxygen into the detector for detection comprises: the carrier gas carries separated oxygen through the second valve body into the detector.
According to some embodiments of the disclosure, the method of eliminating interference of gas chromatography oxygen peaks further comprises: and carrier gas enters the second chromatographic column through a third carrier gas inlet of the second valve body, and the second chromatographic column is subjected to reverse purging.
According to the system and the method for eliminating the interference of the oxygen peak of the gas chromatography, the peak area and the oxygen peak area of the target object are simultaneously obtained in one detection period through the detector, the interference of the oxygen peak is eliminated according to the peak area and the oxygen peak area of the target object, and a real-time monitoring result is obtained.
Drawings
FIG. 1 is a schematic diagram of a system for eliminating interference of gas chromatography oxygen peaks according to the present disclosure;
FIG. 2 is a flow chart of a method of eliminating interference of gas chromatography oxygen peaks according to the present disclosure.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways, without departing from the spirit or scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present disclosure. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
Throughout the description of the present disclosure, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or otherwise in communication with one another; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the disclosure. To simplify the disclosure of the present disclosure, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings, and it should be understood that the exemplary embodiments described herein are merely for the purpose of illustrating and explaining the present disclosure and are not intended to limit the present disclosure.
As shown in fig. 1, an embodiment of the present disclosure provides a system for eliminating oxygen peak interference in a gas chromatography, where two quantitative rings are respectively filled with sample gas in the same detection period, a target peak area of the sample gas in one quantitative ring and an oxygen peak area of the sample gas in the other quantitative ring are detected, and a content of a target in the sample gas is determined according to the target peak area and the oxygen peak area. The interference of oxygen on the content detection of the target object can be eliminated in real time, and the monitoring accuracy is improved. The target in the present example is a substance whose peak area is interfered with oxygen when detected by a gas chromatograph.
The system for eliminating the interference of the gas chromatography oxygen peak comprises a target gas path. The object gas circuit comprises a first quantitative ring 100 and a first chromatographic column 200, wherein the first quantitative ring 100 is connected with the first chromatographic column 200. The first quantitative ring 100 is filled with a certain amount of sample gas, the sample gas in the first quantitative ring 100 is conveyed to the first chromatographic column 200 through the carrier gas, and the first chromatographic column 200 can separate the target object in the sample gas. The target separated by the first chromatographic column 200 is transferred to a detector 300, and the peak area of the target is determined. Optionally, the target is total hydrocarbons.
The system for eliminating the interference of the gas chromatography oxygen peak also comprises an oxygen gas path. The oxygen gas circuit comprises a second quantitative ring 400 and a second chromatographic column 500, and the second quantitative ring 400 is connected with the second chromatographic column 500. The second quantitative ring 400 is filled with a certain amount of sample gas, the sample gas in the second quantitative ring 400 is conveyed to the second chromatographic column 500 through the carrier gas, and the second chromatographic column 500 can separate oxygen in the sample gas. The oxygen separated by the second column 500 is sent to the detector 300 to determine the oxygen peak area.
The sample gas input into the first quantitative ring 100 and the second quantitative ring 400 is the sample gas in the same detection period. Optionally, the first dosing ring 100 is connected to the second dosing ring 400, and the sample gas fills the first dosing ring 100 and enters the second dosing ring 400. The sample gas may also first fill the second dosing ring 400 and then enter the first dosing ring 100.
The detector 300 is connected to the first chromatographic column 200 and the second chromatographic column 500, respectively. The target separated by the first chromatographic column 200 is transferred to a detector 300, and the target peak area of the sample gas is determined. The oxygen separated by the second column 500 is sent to the detector 300 to determine the oxygen peak area of the sample gas.
The detector 300 of the present embodiment may be a hydrogen Flame Ionization Detector (FID). The hydrogen Flame Ionization Detector (FID) is a high-sensitivity universal detector for detecting organic matters, has high sensitivity which is higher than that of a thermal conductivity detector by nearly 3 orders of magnitude, and the lower detection limit can be as low as 10-13g/s, linear range as wide as 107～1012The detector has the advantages of simple structure, good stability, high sensitivity and quick response, has a certain response signal for detecting oxygen, and is an ideal detector. Other types of detectors may be used for detector 300, as desired.
The calculating unit 600 is connected to the detector 300, the peak area and the oxygen peak area of the target object detected by the detector 300 are transmitted to the calculating unit 600, and the calculating unit 600 subtracts the oxygen peak area from the peak area of the target object to determine the content of the target object in the gas.
The system for eliminating the interference of the oxygen peak of the gas chromatograph eliminates the interference of the oxygen peak in the gas chromatograph in real time, and improves the accuracy of detection.
According to an optional technical scheme of this disclosure, the system of eliminating the interference of the gas chromatography oxygen peak also includes a first valve body 700 and a second valve body 800. In this embodiment, the first valve body 700 is a ten-way valve, and the second valve body 800 is a six-way valve.
The first port 1 of the first valve body 700 is used as a sample gas inlet, the fourth port 4 of the first valve body 700 is used as a first carrier gas inlet, the ninth port 9 of the first valve body 700 is used as a second carrier gas inlet, and the second port 2 of the first valve body 700 is used as a first exhaust port.
The first dosing ring 100 is connected to the first valve body 700, and one port of the first dosing ring 100 is connected to the third port 3 of the first valve body 700 and the other port is connected to the sixth port 6 of the first valve body 700. The fifth port 5 of the first valve body 700 is connected to the first chromatographic column 200. One port of the second dosing ring 400 is connected to the seventh port 7 of the first valve body 700 and the other port is connected to the tenth port 10 of the first valve body 700. The eighth port 8 of the first valve body 700 is connected with the fourth port D of the second valve body 800.
One port of the second column 500 is connected to the third port C of the second valve body 800, and the other port is connected to the sixth port F of the second valve body 800. The fifth port E of the second valve body 800 is connected to the detector 300. Alternatively, the first port a of the second valve body 800 serves as a third charge air inlet, and the second port B of the second valve body 800 serves as a second exhaust port.
During sample injection, sample gas enters from the first valve port 1 of the first valve body 700, enters the second quantitative ring 400 through the tenth valve port 10 of the first valve body 700, and then enters the first quantitative ring 100 through the seventh valve port of the first valve body 700 and the sixth valve port 6 of the first valve body 700. After the sample gas fills the first dosing ring 100, the excess sample gas is exhausted through the third port 3 of the first valve body 700 and the second port 2 of the first valve body 700. The second quantitative ring 400 and the first quantitative ring 100 are filled with the sample gas in sequence, so that the sample gas in the first quantitative ring 100 and the sample gas in the second quantitative ring 400 are ensured to be the sample gas in the same detection period.
During detection, the carrier gas can be nitrogen. Carrier gas enters through the fourth port 4 of the first valve body 700 and through the third port 3 of the first valve body 700 into the first dosing ring 100. The carrier gas carries the sample gas in the first quantitative ring 100 to flow out from the sixth port 6 of the first valve body 700, and enters the first chromatographic column 200 through the fifth port 5 of the first valve body 700. The first chromatographic column 200 separates a target, such as total hydrocarbons, in the sample gas. The separated target enters a detector 300 for detection, and the peak area of the target is determined.
Another carrier gas enters through the ninth port 9 of the first valve body 700 and enters the second dosing ring 400 through the tenth port 10 of the first valve body 700. The carrier gas carrying the sample gas in the second quantitative ring 400 flows out from the seventh valve port 7 of the first valve body 700, and then sequentially enters the second chromatographic column 500 through the eighth valve port 8 of the first valve body 700, the fourth valve port D of the second valve body 800, and the third valve port C of the second valve body 800. The second column 500 separates oxygen from the sample gas. The separated oxygen enters the detector 300 through the sixth port F of the second valve body 800 and the fifth port E of the second valve body 800 in sequence for detection, and the oxygen peak area is determined.
When the second chromatographic column 500 is purged, the carrier gas enters the second chromatographic column 500 through the first valve port a of the second valve body 800, enters the second chromatographic column 500 through the sixth valve port F of the second valve body 800, and is discharged through the third valve port C of the second valve body 800 and the second valve port B of the second valve body 800, so that the second chromatographic column 500 is purged.
In this embodiment, when the sample gas and the carrier gas are switched, the communication relationship between the valve ports of the first valve body 700 and the second valve body 800 is switched accordingly.
According to an alternative aspect of the present disclosure, the detector 300 includes a combustion gas inlet and an oxidant gas inlet. When the detector 300 is a hydrogen flame ionization detector, the combustion gas is hydrogen and the combustion-supporting gas is hydrocarbon-removed air.
As shown in fig. 2, embodiments of the present disclosure also provide a method for eliminating interference of gas chromatography oxygen peaks, including:
1. and introducing the sample gas into the first quantitative ring 100 and the second quantitative ring 200, wherein the sample gas entering the first quantitative ring 100 and the second quantitative ring 200 is the sample gas in the same detection period.
Optionally, passing the sample gas into the first dosing ring and the second dosing ring comprises: the sample gas enters the first dosing ring and the second dosing ring through the sample gas inlet of the first valve body 700.
2. And introducing a carrier gas into the first quantitative ring 100, wherein the carrier gas carries the sample gas in the first quantitative ring 100 into the first chromatographic column 200, and the first chromatographic column 200 separates the target object in the sample gas.
Optionally, passing the carrier gas into the first dosing ring 100 comprises: the carrier gas enters the first dosing ring through the first carrier gas inlet of the first valve body 700.
3. And the carrier gas carries the separated target object to enter a detector for detection, and the peak area of the target object is determined.
4. And introducing a carrier gas into the second quantitative ring 400, wherein the carrier gas carries the sample gas in the second quantitative ring 400 to enter the second chromatographic column 500, and the second chromatographic column 500 separates oxygen in the sample gas.
Optionally, passing a carrier gas into the second quantitative ring 400, the carrier gas carrying the sample gas in the second quantitative ring 400 into the second chromatographic column 500 comprises: the carrier gas enters the second quantitative ring 400 through the second carrier gas inlet of the first valve body 700, and the carrier gas carries the sample gas in the second quantitative ring 400 to enter the second chromatographic column 500 through the second valve body 800.
5. The carrier gas carries the separated oxygen gas into the detector 300 for detection, and the oxygen peak area of the sample gas is determined.
Optionally, the carrier gas carrying the separated oxygen into the detector 300 for detection comprises: the carrier gas carries the separated oxygen through the second valve body 800 into the detector.
6. And the calculation unit subtracts the oxygen peak area from the target object peak area to determine the target object content of the sample gas.
If the target to be detected is total hydrocarbon, the detector 300 detects the total hydrocarbon peak area and the oxygen peak area, respectively. And subtracting the oxygen peak area from the total hydrocarbon peak area to determine the total hydrocarbon content of the sample gas.
According to an optional technical scheme of the present disclosure, the carrier gas enters the second chromatographic column 500 through the third carrier gas inlet of the second valve body 800, the second chromatographic column 500 is subjected to reverse purging, and the gas after the reverse purging is discharged from the second exhaust port of the second valve body 800.
According to the system and the method for eliminating the interference of the oxygen peak of the gas chromatography, the peak area of the target object and the oxygen peak area are simultaneously obtained by the detector in one detection period, the interference of the oxygen peak is eliminated according to the peak area of the target object and the oxygen peak area, the influence of the dynamic change of the components of the sample gas on the detection result is avoided, and the accuracy of the real-time monitoring result is improved.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.
Finally, it should be noted that: although the present disclosure has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (4)
1. A system for eliminating interference of gas chromatography oxygen peaks, comprising:
the target gas circuit comprises a first quantitative ring and a first chromatographic column connected with the first quantitative ring, and the first chromatographic column is used for separating a target;
the oxygen gas circuit comprises a second quantitative ring and a second chromatographic column connected with the second quantitative ring, and the second chromatographic column is used for separating oxygen;
the detector is respectively connected with the first chromatographic column and the second chromatographic column and is used for detecting the peak area of a target object and the oxygen peak area of the gas;
and the calculating unit is connected with the detector and determines the target object content of the gas according to the target object peak area and the oxygen peak area.
2. The system for eliminating interference of oxygen peaks in a gas chromatograph according to claim 1, further comprising:
the first valve body comprises a sample gas inlet, a first carrier gas inlet, a second carrier gas inlet and a first exhaust port, the first quantitative ring is connected with the first valve body, the first valve body is connected with the first chromatographic column, and the second quantitative ring is connected with the first valve body;
and the second valve body is connected with the first valve body, the second chromatographic column is connected with the second valve body, and the second valve body is connected with the detector.
3. The system for eliminating gas chromatography oxygen spike interference as recited in claim 2, wherein the second valve body further comprises a third carrier gas inlet and a second exhaust port.
4. The system for eliminating interference of oxygen peaks in gas chromatography as claimed in claim 1, wherein the detector comprises a fuel gas inlet and a combustion gas inlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922084484.3U CN211505362U (en) | 2019-11-26 | 2019-11-26 | System for eliminating gas chromatography oxygen peak interference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922084484.3U CN211505362U (en) | 2019-11-26 | 2019-11-26 | System for eliminating gas chromatography oxygen peak interference |
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| CN211505362U true CN211505362U (en) | 2020-09-15 |
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