CN214011151U - Gas circuit system and non-methane total hydrocarbon on-line monitoring chromatograph - Google Patents
Gas circuit system and non-methane total hydrocarbon on-line monitoring chromatograph Download PDFInfo
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- CN214011151U CN214011151U CN202023144786.4U CN202023144786U CN214011151U CN 214011151 U CN214011151 U CN 214011151U CN 202023144786 U CN202023144786 U CN 202023144786U CN 214011151 U CN214011151 U CN 214011151U
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Abstract
The utility model discloses a gas circuit system and total hydrocarbon on-line monitoring chromatograph of non-methane relates to gas chromatography detection technical field. The gas path system comprises a fourteen-way valve, a first quantitative ring, a methane column, a total hydrocarbon column, a second quantitative ring, an FID detector, a carrier gas source, a hydrogen source and an air source; the No. 3 port of the fourteen-way valve is connected with a second quantitative ring, and the second quantitative ring is connected with the No. 6 port of the fourteen-way valve; the port 4 of the fourteen-way valve is connected with a carrier gas source; the No. 5 port of the fourteen-way valve is connected with a total hydrocarbon column, and the total hydrocarbon column is connected with an FID detector; the No. 7 port of the fourteen-way valve is connected with a first quantitative ring, and the first quantitative ring is connected with the No. 14 port of the fourteen-way valve; the No. 8 port of the fourteen-way valve is connected with a methane column, and the methane column is connected with the No. 12 port of the fourteen-way valve; the No. 10 port of the fourteen-way valve is connected with a carrier gas source; port number 11 of the fourteen way valve is connected to the FID detector. The utility model has the characteristics of it is accurate to methane and total hydrocarbon content measurement in the sample gas.
Description
Technical Field
The utility model relates to a gas chromatography detects technical field, especially relates to a gas circuit system and total hydrocarbon on-line monitoring chromatograph of non-methane.
Background
The gas chromatograph is a device for separating, analyzing and detecting a mixed sample, and the content of the non-methane total hydrocarbons is obtained by performing subtraction by using a six-way valve or a ten-way valve and performing one-time or two-time sample introduction and detection on the contents of methane and total hydrocarbons in sample gas by using the conventional gas chromatograph when the non-methane total hydrocarbons are detected. This method has the following four problems:
1. the two valve systems can not completely ensure that the gas entering the two quantitative rings is waste gas generated at the same time when the sample is injected, and the real value of the non-methane total hydrocarbon obtained by difference subtraction has certain deviation, so that the monitoring result is inaccurate.
2. The original system generally only carries out back flushing on the methane column and the total hydrocarbon column, and for places with serious pollution, the detector is also easily polluted, so that the monitoring result is seriously interfered. The method is provided with the three-way back flushing system, so that the methane column, the total hydrocarbon column and the FID detector can be respectively subjected to back flushing, and the pollution of key modules such as the methane column, the total hydrocarbon column and the FID detector can be effectively reduced;
3. sample gas is through the switching of two valves, and there are trace absorption and gas leakage in valve body itself, and the effect that the gas leakage brought can be enlargied in the stack of two valve system, leads to measuring result and actual result to have great deviation.
4. The use of two valves is expensive in price and cost, and the gas circuit is complex, thus being not beneficial to installation and maintenance.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a solve the current gas chromatograph in detecting the sample gas methane and the problem that the testing result's of total hydrocarbon content existence accuracy is poor, damage instrument life-span and gas circuit are complicated.
In order to solve the above problem, in a first aspect, an embodiment of the present invention provides a gas path system, which includes a fourteen-way valve, a first quantitative ring, a methane column, a total hydrocarbon column, a second quantitative ring, a FID detector, a carrier gas source, a hydrogen source, and an air source; the No. 1 port of the fourteen-way valve is a sample gas inlet; the No. 2 port of the fourteen-way valve is a sample gas outlet; the No. 3 port of the fourteen-way valve is connected with a second quantitative ring, and the second quantitative ring is connected with the No. 6 port of the fourteen-way valve; the port 4 of the fourteen-way valve is connected with a carrier gas source; the No. 5 port of the fourteen-way valve is connected with a total hydrocarbon column, and the total hydrocarbon column is connected with an FID detector; the No. 7 port of the fourteen-way valve is connected with a first quantitative ring, and the first quantitative ring is connected with the No. 14 port of the fourteen-way valve; the No. 8 port of the fourteen-way valve is connected with a methane column, and the methane column is connected with the No. 12 port of the fourteen-way valve; the port 9 of the fourteen-way valve is an emptying port; the No. 10 port of the fourteen-way valve is connected with a carrier gas source; the port No. 11 of the fourteen-way valve is connected with an FID detector; the port 13 of the fourteen-way valve is connected with a carrier gas source; the hydrogen source is connected with the FID detector; the air source is connected to the FID detector.
The further technical proposal is that the No. 4 port of the fourteen-way valve is connected with a carrier gas source through a first valve.
The further technical proposal is that the No. 10 port of the fourteen-way valve is connected with a carrier gas source through a second valve.
The further technical proposal is that the No. 13 port of the fourteen-way valve is connected with a carrier gas source through a third valve.
The further technical proposal is that the hydrogen source is connected with the FID detector through a fourth valve.
The further technical proposal is that the air source is connected with the FID detector through a fifth valve.
The further technical scheme is that the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all EPC electronic flow valves.
The further technical scheme is that a No. 5 port of the fourteen-way valve is connected with the total hydrocarbon column through a passivation pipe.
The further technical proposal is that the total hydrocarbon column is connected with an FID detector through a passivation pipe.
In a second aspect, an embodiment of the present invention provides a non-methane total hydrocarbon on-line monitoring chromatograph, which includes a gas path system as in the first aspect.
Compared with the prior art, the embodiment of the utility model provides a technical effect that can reach includes:
1. the instrument completes the separation and detection of methane and total hydrocarbon in the sample gas by one-time sampling, can completely eliminate the interference of air (oxygen) peak in the sample to the detector, and avoids the error influence caused by multiple sampling.
2. The instrument has a back flushing function (sampling process), and can automatically clean the pipeline, the detector and the chromatographic column before measurement at each time, so that the accuracy of a measurement result is improved on one hand, and the service life of the chromatographic column is prolonged on the other hand.
3. The connecting pipeline for the total hydrocarbon chromatographic column to enter and exit from the instrument uses a passivation pipe, so that the adsorption of the pipeline to hydrocarbon substances can be effectively reduced, and the measurement result is more objective and real.
4. The gas circuit system only adopts a fourteen-way valve, and has the advantages of low cost, simple structure and easy installation and maintenance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a gas circuit system in a sampling process according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a gas circuit system in a measurement process according to an embodiment of the present invention.
Reference numerals
Fourteen-way valve 101, first dosing ring 102, methane column 103, total hydrocarbons column 104, second dosing ring 105, FID detector 106, carrier gas source 107, hydrogen source 108, air source 109, first valve 110, second valve 111, third valve 112, fourth valve 113, and fifth valve 114.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, wherein like component numbers represent like components. It is obvious that the embodiments to be described below are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention. As used in the description of the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Referring to fig. 1-2, an embodiment of the present invention provides a gas path system, which includes a fourteen-way valve 101, a first dosing ring 102, a methane column 103, a total hydrocarbon column 104, a second dosing ring 105, a FID detector 106, a carrier gas source 107, a hydrogen source 108, and an air source 109. The fourteen-way valve 101 comprises a total of 14 ports. The connection relationship of each device of the gas path system is as follows:
port 1 of the fourteen-way valve 101 is a sample gas inlet, and sample gas enters the fourteen-way valve 101 from port 1 of the fourteen-way valve 101. The port No. 2 of the fourteen-way valve 101 is a sample gas outlet, and the sample gas is discharged from the port No. 2 of the fourteen-way valve 101 to the fourteen-way valve 101. The port 3 of the fourteen-way valve 101 is connected to the second fixed-displacement ring 105, and the second fixed-displacement ring 105 is connected to the port 6 of the fourteen-way valve 101. Port No. 4 of the fourteen-way valve 101 is connected to a carrier gas source 107. Port No. 5 of the fourteen-way valve 101 is connected to a total hydrocarbon column 104, and the total hydrocarbon column 104 is connected to a FID detector 106. Port No. 7 of the fourteen way valve 101 is connected to the first volume ring 102, and the first volume ring 102 is connected to port No. 14 of the fourteen way valve 101. The No. 8 port of the fourteen-way valve 101 is connected with the methane column 103, and the methane column 103 is connected with the No. 12 port of the fourteen-way valve 101. Port No. 9 of the fourteen-way valve 101 is a drain. Port No. 10 of the fourteen-way valve 101 is connected to a carrier gas source 107. Port No. 11 of the fourteen-way valve 101 is connected to the FID detector 106. Port No. 13 of the fourteen-way valve 101 is connected to a carrier gas source 107. Hydrogen source 108 is connected to FID detector 106. The air source 109 is connected to the FID detector 106.
It is to be appreciated that, in embodiments of the present invention, the carrier gas source 107 may be embodied as a gas tank storing a carrier gas. The air source 109 may be embodied as an air reservoir storing air. Hydrogen source 108 may embody a storage tank that stores hydrogen gas.
Further, for better flow control, in the embodiment of the present invention, the port No. 4 of the fourteen-way valve 101 is connected to the carrier gas source 107 through the first valve 110. Port No. 10 of the fourteen-way valve 101 is connected to the carrier gas source 107 through a second valve 111. Port No. 13 of the fourteen-way valve 101 is connected to a carrier gas source 107 through a third valve 112. Hydrogen source 108 is connected to FID detector 106 through fourth valve 113. The air source 109 is connected to the FID detector 106 through a fifth valve 114.
In one embodiment, the first valve 110, the second valve 111, the third valve 112, the fourth valve 113, and the fifth valve 114 are all EPC electronic flow valves. The EPC electronic flow valve has the characteristic of accurate flow control.
Further, in the present embodiment, port No. 5 of the fourteen-way valve 101 is connected to the total hydrocarbon column 104 through a passivation pipe; the total hydrocarbon column 104 is connected with the FID detector 106 through a passivation pipe, so that the connection pipelines for entering and exiting the total hydrocarbon column 104 are all made of passivation pipes, the adsorption of the pipelines to hydrocarbon substances can be effectively reduced, and the measurement result is more objective and real.
The embodiment of the utility model provides a gas circuit system's theory of operation as follows:
referring to fig. 1, the sampling process is as follows:
when the fourteen-way valve is in the initial state, sample gas enters the quantitative ring 1 through the No. 1 port and the No. 14 port of the fourteen-way valve, enters the quantitative ring 2 through the No. 7 port and the No. 6 port of the fourteen-way valve, and is discharged through the No. 3 port and the No. 2 port. The first dosing ring and the second dosing ring are thereby filled with a sample gas. Carrier gas (nitrogen or zero gas) enters the instrument and then is divided into 3 paths, the flow is accurately controlled by 3 EPC electronic flow valves, and the carrier gas enters the fourteen-way valve through a No. 4 port, a No. 10 port and a No. 13 port respectively; the carrier gas at this stage has the main function of cleaning the pipeline, the total hydrocarbon column, the methane column and the FID detector of the gas circuit system and removing the sample gas remained in the gas circuit system after the last measurement process is finished. The 1 st carrier gas enters and cleans the total hydrocarbon column through the No. 4 port and the No. 5 port of the fourteen-way valve, and is discharged after passing through the FID detector. The 2-way carrier gas enters and sweeps the FID detector via port number 10 and port number 11 of the fourteen-way valve. The 3 rd carrier gas enters and sweeps the methane column through the 13 th port and the 12 th port of the fourteen-way valve and exits through the 8 th port and the 9 th port of the fourteen-way valve.
Referring to fig. 2, the measurement process is as follows:
and after sampling is finished, the fourteen-way valve is switched by the driving gas to change the connection state in the valve, and the system enters a measurement stage. At this time, the sample gas enters and exits via port No. 1 and port No. 2 of the fourteen-way valve. The carrier gas (nitrogen or zero gas) enters the instrument and then is divided into 3 paths, the flow rate is accurately controlled by 3 EPC electronic flow valves, the main function of the carrier gas at this stage is to load the sample gas in 2 quantitative rings into a methane chromatographic column and a total hydrocarbon column respectively, the methane in the sample gas is separated by the methane column, the total hydrocarbon in the sample gas is separated by the total hydrocarbon column, and finally the carrier gas enters an FID detector to measure the concentration of the methane and the total hydrocarbon, and the difference value of the two is the concentration of the non-methane total hydrocarbon. Specifically, the 1 st path of carrier gas enters the quantitative ring 2 through the port 4 and the port 3 of the fourteen-way valve, the sample gas in the quantitative ring 2 enters the total hydrocarbon column through the port 6 and the port 5 of the fourteen-way valve, and the separated total hydrocarbon and the rest gas sequentially enter the FID detector for measurement and then are discharged. The 2 nd carrier gas is directly evacuated via port number 10 and port number 9 of the fourteen-way valve. And the 3 rd path of carrier gas enters the quantitative ring 1 through the No. 13 port and the No. 14 port of the fourteen-way valve, the sample gas in the quantitative ring 1 enters the methane column through the No. 7 port and the No. 8 port of the fourteen-way valve, and the separated methane and the rest gas sequentially enter the FID detector through the No. 12 port and the No. 11 port of the fourteen-way valve for measurement and then are discharged. Hydrogen and air are each precisely flow controlled by 1 EPC electronic flow valve, entering the FID detector for ignition of the hydrogen flame.
After the measurement is finished, the fourteen-way valve changes the connection state inside the valve through the switching of the driving gas, and the system enters a sampling stage.
The technical scheme of the utility model can reach following technological effect:
1. the instrument completes the separation and detection of methane and total hydrocarbon in the sample gas only by once valve cutting sampling, ensures that the total hydrocarbon and the methane are quantitatively collected by the sample gas at the same moment, obtains non-methane total hydrocarbon by subtraction and is closer to the true value at the moment, and avoids the error influence brought by repeated valve cutting sampling.
2. The instrument has a back flushing function (sampling process), and can automatically clean the pipeline, the detector and the chromatographic column before measurement at each time, so that the accuracy of a measurement result is improved on one hand, and the service life of the chromatographic column is prolonged on the other hand.
3. The connecting pipeline for the total hydrocarbon chromatographic column to enter and exit from the instrument uses a passivation pipe, so that the adsorption of the pipeline to hydrocarbon substances can be effectively reduced, and the measurement result is more objective and real.
4. The gas circuit system only adopts a fourteen-way valve, and has the advantages of low cost, simple structure and easy installation and maintenance.
The utility model discloses still provide a total hydrocarbon on-line monitoring chromatograph of non-methane, the total hydrocarbon on-line monitoring chromatograph of non-methane includes the gas circuit system that the embodiment provided as above.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, while the invention has been described with respect to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
The above description is for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A gas path system is characterized by comprising a fourteen-way valve, a first quantitative ring, a methane column, a total hydrocarbon column, a second quantitative ring, a FID detector, a carrier gas source, a hydrogen source and an air source; the No. 1 port of the fourteen-way valve is a sample gas inlet; the No. 2 port of the fourteen-way valve is a sample gas outlet; the No. 3 port of the fourteen-way valve is connected with a second quantitative ring, and the second quantitative ring is connected with the No. 6 port of the fourteen-way valve; the port 4 of the fourteen-way valve is connected with a carrier gas source; the No. 5 port of the fourteen-way valve is connected with a total hydrocarbon column, and the total hydrocarbon column is connected with an FID detector; the No. 7 port of the fourteen-way valve is connected with a first quantitative ring, and the first quantitative ring is connected with the No. 14 port of the fourteen-way valve; the No. 8 port of the fourteen-way valve is connected with a methane column, and the methane column is connected with the No. 12 port of the fourteen-way valve; the port 9 of the fourteen-way valve is an emptying port; the No. 10 port of the fourteen-way valve is connected with a carrier gas source; the port No. 11 of the fourteen-way valve is connected with an FID detector; the port 13 of the fourteen-way valve is connected with a carrier gas source; the hydrogen source is connected with the FID detector; the air source is connected to the FID detector.
2. The gas circuit system of claim 1, wherein port No. 4 of the fourteen-way valve is connected to the carrier gas source through the first valve.
3. The gas circuit system of claim 2, wherein port No. 10 of the fourteen-way valve is connected to the carrier gas source through a second valve.
4. The gas circuit system of claim 3, wherein port 13 of the fourteen-way valve is connected to the carrier gas source through a third valve.
5. The gas circuit system of claim 4, wherein the hydrogen source is connected to the FID detector through a fourth valve.
6. The air circuit system of claim 5, wherein the air source is connected to the FID detector through a fifth valve.
7. The gas circuit system of claim 6, wherein the first valve, the second valve, the third valve, the fourth valve, and the fifth valve are all EPC electronic flow valves.
8. The gas circuit system of claim 1, wherein port No. 5 of the fourteen-way valve is connected to the total hydrocarbon column through a passivation tube.
9. The gas circuit system of claim 1, wherein the total hydrocarbon column is connected to the FID detector via a passivation tube.
10. A non-methane total hydrocarbon on-line monitoring chromatograph, comprising the gas path system of any of claims 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144493A (en) * | 2022-06-27 | 2022-10-04 | 山东光测环境科技有限公司 | Gas circuit structure of on-line monitoring analyzer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144493A (en) * | 2022-06-27 | 2022-10-04 | 山东光测环境科技有限公司 | Gas circuit structure of on-line monitoring analyzer |
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