CN212483478U - Device for directly measuring non-methane total hydrocarbon - Google Patents
Device for directly measuring non-methane total hydrocarbon Download PDFInfo
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- CN212483478U CN212483478U CN202021240360.6U CN202021240360U CN212483478U CN 212483478 U CN212483478 U CN 212483478U CN 202021240360 U CN202021240360 U CN 202021240360U CN 212483478 U CN212483478 U CN 212483478U
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Abstract
The utility model provides a device for directly measuring non-methane total hydrocarbon, which comprises a quantitative unit and a detection unit; the inside of the chromatographic column is provided with a polar packing area and a non-polar packing area; the multi-way valve is provided with a first port suitable for being communicated with carrier gas, a third port suitable for being communicated with sample gas, a fourth port for discharging the sample gas, a seventh port communicated with the detection unit, a sixth port and an eighth port respectively communicated with two ends of the chromatographic column, and a second port and a fifth port communicated with two ends of the quantitative unit; by switching, so that: when the sample introduction state is achieved, the carrier gas sequentially passes through the first port, the second port, the quantitative unit, the fifth port, the sixth port, the polar filler area, the nonpolar filler area, the eighth port and the seventh port; when the carrier gas is in a back blowing state, the carrier gas sequentially passes through the first port, the eighth port, the nonpolar filler area, the polar filler area, the sixth port and the seventh port. The utility model has the advantages of measure under the complicated background.
Description
Technical Field
The present invention relates to gas analysis, and more particularly to a device for directly measuring non-methane total hydrocarbons.
Background
Non-methane total hydrocarbons are defined in HJ38 as the sum of other gaseous organic compounds (on a carbon basis, unless otherwise noted) other than methane that respond on a hydrogen flame ionization detector. The existing determination method mainly adopts a double-column double-valve single detector or a double-column single-valve single detector to respectively determine the concentrations of methane and total hydrocarbon, and then calculates the content of non-methane total hydrocarbon by subtraction.
A landmark released in Shanghai city of 5 months in 2018 is added with a method for directly measuring non-methane total hydrocarbons, namely a method for separating the non-methane total hydrocarbons from the total hydrocarbons and directly measuring the concentration of the non-methane total hydrocarbons. The direct method can adopt a single column, a single valve and a single detector to complete analysis, can avoid oxygen peak interference, can improve the analysis efficiency and save the cost of an analysis instrument. However, in the existing direct measurement method, a single column adopts a chromatographic column with a single filler or a fixed phase, and when the components contain aromatic hydrocarbon or components with stronger polarity, the peak pattern of the non-methane total hydrocarbon cannot meet the requirement, so that the method is not suitable for the detection of the non-methane total hydrocarbon under the complicated field condition, and the application of the method is limited to the field of simple component projects.
SUMMERY OF THE UTILITY MODEL
In order to solve the deficiencies in the prior art schemes, the utility model provides a device for directly measuring non-methane total hydrocarbon under the complex background (gas has polar components and non-polar components).
The utility model aims at realizing through the following technical scheme:
the device for directly measuring the non-methane total hydrocarbons comprises a quantitative unit and a detection unit; the device for directly measuring the non-methane total hydrocarbon also comprises:
a chromatography column having a polar packing region and a non-polar packing region inside;
the multi-way valve is provided with a first port suitable for being communicated with carrier gas, a third port suitable for being communicated with sample gas, a fourth port for discharging the sample gas, a seventh port communicated with the detection unit, a sixth port and an eighth port respectively communicated with two ends of the chromatographic column, and a second port and a fifth port communicated with two ends of the quantitative unit; by switching, so that:
when the quantitative sample gas is in a quantitative state, the sample gas sequentially passes through the third port, the second port, the quantitative unit, the fifth port and the fourth port; when the sample introduction state is achieved, the carrier gas sequentially passes through the first port, the second port, the quantitative unit, the fifth port, the sixth port, the polar filler area, the nonpolar filler area, the eighth port and the seventh port; when the carrier gas is in a back blowing state, the carrier gas sequentially passes through the first port, the eighth port, the nonpolar filler area, the polar filler area, the sixth port and the seventh port.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. applied in complex backgrounds;
the chromatographic column is provided with a polar packing area and a non-polar packing area: after the sample gas passes through the polar packing area, polar components are intercepted, alkane enters the non-polar packing area, methane and other alkane components are separated, namely, carrier gas pushes the gas of the quantitative unit to enter the chromatographic column in the forward direction, and methane enters the detection unit; when the detection unit detects a methane peak, the carrier gas reversely enters the chromatographic column, and non-methane total hydrocarbons are reversely blown into the detection unit, so that the spectrograms are combined into a complete chromatographic peak;
according to the technical principle, the method is also applicable to the condition that the sample gas contains aromatic hydrocarbon or components with stronger polarity;
2. the structure is simple;
only one multi-way valve, one chromatographic column and one quantitative unit are needed to realize the separation of methane and non-methane total hydrocarbons, and the structure is simple.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate 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 schematic diagram of an apparatus for directly measuring non-methane total hydrocarbons according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. 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. Accordingly, 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 an apparatus for directly measuring non-methane total hydrocarbons according to an embodiment of the present invention, as shown in fig. 1, the apparatus for directly measuring non-methane total hydrocarbons includes:
the quantitative unit 11 and the detection unit 41, if the quantitative unit adopts a quantitative ring, and the detection unit adopts a PID detector, which are prior art in the field, and the specific structure and working mode are not described herein again;
the chromatographic column 31 is internally provided with a polar packing area and a non-polar packing area, wherein the polar packing area is a polar fixed phase such as OV series and the like, and the non-polar packing area is a weak or non-polar fixed phase such as Porapak-Q, GDX-104, GDX-502 and the like;
a multi-way valve 21, such as an 8-way valve and a 10-way valve, wherein the multi-way valve 21 is provided with a first port 1 suitable for communicating carrier gas, a third port 3 suitable for communicating sample gas and a fourth port 4 for discharging the sample gas, a seventh port 7 communicated with the detection unit, a sixth port 6 and an eighth port 8 respectively communicated with two ends of the chromatographic column, and a second port 2 and a fifth port 5 communicated with two ends of the quantitative unit; by switching, so that:
when the sample gas is in a quantitative state, the sample gas sequentially passes through the third port 3, the second port 2, the quantitative unit 11, the fifth port 5 and the fourth port 4; when in a sample introduction state, the carrier gas sequentially passes through the first port 1, the second port 2, the quantitative unit 11, the fifth port 5, the sixth port 6, the polar filler region, the non-polar filler region, the eighth port 8 and the seventh port 7; when the carrier gas is in a back blowing state, the carrier gas sequentially passes through the first port 1, the eighth port 8, the nonpolar filler area, the polar filler area, the sixth port 6 and the seventh port 7.
In order to reduce the influence of the gas flow after the carrier gas is blown back to the chromatographic column on the flame of the detector to maintain the flame shape, a gas inlet is further provided on the pipeline between the inlet end of the detection unit 41 and the seventh port 7, for example, by using a tee joint.
In order to improve the detection accuracy, further, the device for directly measuring the non-methane total hydrocarbons further comprises:
the multi-way valve, the quantitative unit and the chromatographic column are arranged in the constant temperature box.
Example 2:
the utility model discloses an application example of the device of direct measurement non-methane total hydrocarbon of embodiment 1.
In this application example, as shown in fig. 1, only one of the quantitative units 11 employs a quantitative ring; only one multi-way valve 21 adopts an 8-way valve; the polar packing area of only one chromatographic column is PEG-20M, and the nonpolar packing area is Porapak-Q; the inlet of the three-way joint 51 is communicated with gas (tail gas blowing) and the seventh port 7, and the outlet is communicated with the detection unit 41; the quantitative unit, the multi-way valve and the chromatographic column are arranged in the incubator.
The utility model discloses a working method of the device of direct measurement non-methane total hydrocarbon is:
a quantitative stage: by switching the multi-way valve 21, the sample gas passes through the third port 3, the second port 2, the quantitative unit 11, the fifth port 5 and the fourth port 4 in sequence;
a sample introduction stage: by switching the multi-way valve 21, the carrier gas passes through the first port 1, the second port 2, the quantifying unit 11, the fifth port 5, the sixth port 6, the chromatographic column 31 (which positively passes through the polar packing area and the nonpolar packing area), the eighth port 8, the seventh port 7 and the three-way joint 51 in sequence, and the carrier gas carries methane separated in the chromatographic column 31 and the tail blowing gas entering through the gas inlet of the three-way joint 51 to enter the detection unit 41; after the detection unit has acquired the methane peak, the multi-way valve 21 is switched so that:
a back flushing stage: the carrier gas sequentially passes through the first port 1, the eighth port 8, the chromatographic column 31 (reversely passes through the nonpolar filler region and the polar filler region), the sixth port 6, the seventh port 7 and the three-way joint 51 and enters the detection unit 41, and the carrier gas carries the non-methane total hydrocarbons in the chromatographic column 31 to enter the detection unit 41, so that a complete chromatographic peak is synthesized.
Example 3:
according to the utility model discloses an application example of the device of direct measurement non-methane total hydrocarbon of embodiment 1 is different from embodiment 2:
the multi-way valve is a ten-way valve and is also provided with a ninth port and a tenth port, and two ends of the pipeline are communicated with the ninth port and the tenth port; the ninth port selectively communicates with the first and eighth ports, and the tenth port selectively communicates with the eighth and seventh ports; by switching of the multi-way valve, so that:
a sample introduction stage: by switching the multi-way valve, the carrier gas sequentially passes through the first port, the second port, the quantitative unit, the fifth port, the sixth port, the chromatographic column (positively passes through the polar packing area and the nonpolar packing area), the eighth port, the ninth port, the pipeline (positively passes through), the tenth port, the seventh port and the three-way joint, and the carrier gas carries methane separated from the chromatographic column into the detection unit; after the detection unit obtains the methane spectrum peak, switch the multi-ported valve for get into:
a back flushing stage: and the carrier gas sequentially passes through the first port, the ninth port, the tenth port, the eighth port, the chromatographic column (reversely passes through the nonpolar filler region and the polar filler region), the sixth port, the seventh port and the three-way joint and enters the detection unit, and the carrier gas carries the non-methane total hydrocarbons in the chromatographic column to enter the detection unit, so that a complete chromatographic peak is synthesized.
Claims (6)
1. The device for directly measuring the non-methane total hydrocarbons comprises a quantitative unit and a detection unit; the method is characterized in that: the device for directly measuring the non-methane total hydrocarbon also comprises:
a chromatography column having a polar packing region and a non-polar packing region inside;
the multi-way valve is provided with a first port suitable for being communicated with carrier gas, a third port suitable for being communicated with sample gas, a fourth port for discharging the sample gas, a seventh port communicated with the detection unit, a sixth port and an eighth port respectively communicated with two ends of the chromatographic column, and a second port and a fifth port communicated with two ends of the quantitative unit; by switching, so that:
when the quantitative sample gas is in a quantitative state, the sample gas sequentially passes through the third port, the second port, the quantitative unit, the fifth port and the fourth port; when the sample introduction state is achieved, the carrier gas sequentially passes through the first port, the second port, the quantitative unit, the fifth port, the sixth port, the polar filler area, the nonpolar filler area, the eighth port and the seventh port; when the carrier gas is in a back blowing state, the carrier gas sequentially passes through the first port, the eighth port, the nonpolar filler area, the polar filler area, the sixth port and the seventh port.
2. The apparatus for direct measurement of non-methane total hydrocarbons according to claim 1, wherein: and a gas inlet is arranged on a pipeline between the inlet end and the seventh port of the detection unit.
3. The apparatus for direct measurement of non-methane total hydrocarbons according to claim 2, wherein: the device for directly measuring the non-methane total hydrocarbon also comprises:
the multi-way valve, the quantitative unit and the chromatographic column are arranged in the constant temperature box.
4. The apparatus for direct measurement of non-methane total hydrocarbons according to claim 1, wherein: the multi-way valve further has:
the two ends of the pipeline are communicated with the ninth port and the tenth port; the ninth port selectively communicates with the first and eighth ports and the tenth port selectively communicates with the eighth and seventh ports.
5. The apparatus for direct measurement of non-methane total hydrocarbons according to claim 1, wherein: the detection unit is an FID detector.
6. The apparatus for direct measurement of non-methane total hydrocarbons according to claim 1, wherein: the device for directly measuring the non-methane total hydrocarbon also comprises:
and the inlet of the three-way joint is respectively communicated with the seventh port and the gas, and the outlet of the three-way joint is communicated with the detection unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021240360.6U CN212483478U (en) | 2020-06-30 | 2020-06-30 | Device for directly measuring non-methane total hydrocarbon |
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| CN202021240360.6U CN212483478U (en) | 2020-06-30 | 2020-06-30 | Device for directly measuring non-methane total hydrocarbon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487249A (en) * | 2021-12-29 | 2022-05-13 | 聚光科技(杭州)股份有限公司 | Device and method for chromatographic analysis of methane and non-methane total hydrocarbons |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114487249A (en) * | 2021-12-29 | 2022-05-13 | 聚光科技(杭州)股份有限公司 | Device and method for chromatographic analysis of methane and non-methane total hydrocarbons |
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