CN209894763U - Detection apparatus for non-methane total hydrocarbon - Google Patents
Detection apparatus for non-methane total hydrocarbon Download PDFInfo
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- CN209894763U CN209894763U CN201920199408.4U CN201920199408U CN209894763U CN 209894763 U CN209894763 U CN 209894763U CN 201920199408 U CN201920199408 U CN 201920199408U CN 209894763 U CN209894763 U CN 209894763U
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Abstract
The utility model belongs to the technical field of gas detection, and relates to a detection device for non-methane total hydrocarbons, which comprises a multi-channel sample injection valve, a first quantitative ring, a second quantitative ring and a detector, wherein a switchable quantitative mode and a detection mode are formed by the multi-channel sample injection valve; the quantitative mode is a sample gas channel comprising a first quantitative ring and a second quantitative ring; the detection mode comprises two carrier gas channels, wherein one carrier gas channel comprises a first quantitative ring and a methane column, and the other carrier gas channel comprises a second quantitative ring and a total hydrocarbon column; the two carrier gas channels are connected to a detector. The utility model discloses a detection device adopts a fourteen to lead the valve can accord with the detection that the total hydrocarbon of non-methane was realized to the twin columns in the HJ38-2017 standard, simplifies the flow, can solve the problem that current total hydrocarbon of non-methane detection device structure is complicated simultaneously. Has the advantages of simple structure, convenient installation and operation, etc.
Description
Technical Field
The utility model belongs to the technical field of gaseous detection, in particular to novel detection of non-methane total hydrocarbon of methane device.
Background
Non-methane total hydrocarbons (NMHC) refers to the generic term for all hydrocarbons with volatility other than methane, such as alkanes, alkenes, aromatics, and oxygenated hydrocarbon components. When the NMHC in the environment exceeds a certain concentration, direct harm can be generated to human health, and a plurality of volatile organic compounds have carcinogenic effect on human bodies. When non-methane total hydrocarbon generates photochemical smog and ozone through chemical reaction under the condition of illumination, immeasurable damage is caused to the human environment.
Therefore, there is a great need for monitoring NMHC in ambient air and industrial exhaust gases, and our countries have increased the level of supervision of NMHC in the environment over the last years. There are many methods for detecting NMHC, but gas chromatography is used in most countries. The method for detecting the content of NMHC by gas chromatography specified in the HJ38-2017 standard is to directly inject a gas sample into a gas chromatograph with a hydrogen flame ionization detector, measure the content of total hydrocarbon and methane on a total hydrocarbon column and a methane column respectively, and obtain the difference between the total hydrocarbon and the methane as the content of the NMHC.
The conventional testing method of the non-methane total hydrocarbon detection device adopts a single 6-way or single 10-way to realize detection, but the method does not meet the requirement of double-column detection in HJ38, and the device for realizing methane and total hydrocarbon by adopting two multi-channel sample injection valves such as double ten-way and ten-way plus six-way has a complex structure and needs multi-channel carrier gas, and if the two multi-channel sample injection valves are asynchronous, the inaccuracy of analysis data can be caused.
Therefore, the existing non-methane total hydrocarbon detection device has the problems of inaccurate detection data, complex structure and the like. Therefore, there is a need for an apparatus and a method for on-line detection of non-methane total hydrocarbons to solve the problems of the prior art.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model aims to provide a detection device for non-methane total hydrocarbons. The device overcomes the defect of complex structure in the prior art, and simultaneously improves the accuracy of detection.
In order to achieve the purpose, the utility model discloses a main technical scheme: the detection device for the non-methane total hydrocarbons is characterized by comprising a multi-channel sample injection valve, a first quantitative ring, a second quantitative ring and a detector, wherein a switchable quantitative mode and a detection mode are formed by the multi-channel sample injection valve; the quantitative mode is a sample gas channel comprising a first quantitative ring and a second quantitative ring; the detection mode comprises two carrier gas channels, wherein one carrier gas channel comprises a first quantitative ring and a methane column, and the other carrier gas channel comprises a second quantitative ring and a total hydrocarbon column; the two carrier gas channels are connected to a detector.
Preferably, the carrier gas channel comprising the first dosing ring and the methane column is connected to the detector via a solenoid valve.
The multi-channel sample injection valve is a fourteen-way valve.
The solenoid valve is a two-position three-way valve.
The detection device is arranged in a high-temperature box with program temperature control.
The detector difference is a FID detector.
The utility model discloses a multichannel sampling valve can switch between ration and detection mode through the flow direction that changes between the valve passageway. When the multi-channel sampling valve is switched to be in a quantitative mode, the sample gas passes through a sample gas channel comprising a first quantitative ring and a second quantitative ring to realize the collection process of the sample gas, and the sample gas collected by the first quantitative ring and the second quantitative ring is used for analyzing the contents of methane and total hydrocarbon; when the multi-channel sample injection valve is switched to be in a detection mode, the carrier gas enters the detector through the carrier gas channel comprising the first quantitative ring and the methane column, the second quantitative ring and the total hydrocarbon column, and then the analysis of the contents of methane and total hydrocarbon in the sample gas can be respectively realized. And subtracting the content of methane from the detected total hydrocarbon content to obtain the non-methane total hydrocarbon content.
The utility model discloses a solenoid valve, the main effect lies in realizing the blowback to non-methane material.
The utility model discloses a high temperature box be used for right the detection of the non-methane total hydrocarbon of novel methane device heats.
The utility model provides a detection apparatus for total hydrocarbon of non-methane adopts a fourteen to lead the valve can accord with the detection that the total hydrocarbon of non-methane was realized to the double-column in the HJ38-2017 standard, simplifies the flow, can solve the problem that current total hydrocarbon of non-methane detection apparatus structure is complicated simultaneously.
The utility model has the advantages of simple structure, convenient installation and operation, etc.
Drawings
Fig. 1 is a schematic structural diagram of a detection device in a quantitative mode and a back-flushing state according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a detection device in methane and total hydrocarbon detection mode according to an embodiment of the present invention.
In the figure, serial numbers 1-14 on the multi-channel sample injection valve respectively correspond to fourteen channels of the fourteen-way valve.
Detailed Description
The following are embodiments of the present invention, and the technical solutions of the present invention are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example (b): the detection device for the non-methane total hydrocarbons mainly comprises a multi-channel sample injection valve, a first quantitative ring, a second quantitative ring and a detector, wherein a switchable quantitative mode and a detection mode are formed by the multi-channel sample injection valve; the quantitative mode is a sample gas channel comprising a first quantitative ring and a second quantitative ring; the detection mode comprises two carrier gas channels, wherein one carrier gas channel comprises a first quantitative ring and a methane column, and the other carrier gas channel comprises a second quantitative ring total hydrocarbon column; the two carrier gas channels are connected to a detector.
In an embodiment, the carrier gas channel comprising the first dosing ring and the methane column is connected to the detector via a solenoid valve.
In the embodiment, the multi-channel sample injection valve of the detection device is a fourteen-way valve, the electromagnetic valve is a two-position three-way valve, and the detector adopts an FID detector.
The detection device of the embodiment is arranged in a high-temperature box with program temperature control.
The detection method of the detection device of the embodiment is as follows:
referring to fig. 1, a quantitative mode for sample gas collection is shown: the sample gas enters the multi-channel sample valve through the sample gas channel 11, the sample gas passes through the first quantitative ring from the channel 11 to the channel 12 to the channel 9 of the multi-channel sample valve, then passes through the channels 10, 5 and 6 to reach the second quantitative ring, and then passes through the channels 3 to 4 of the multi-channel sample valve to be discharged from the channels 4, and the first quantitative ring and the second quantitative ring realize the quantitative collection process of the sample gas in the process. The carrier gas 1 reaches the methane column through the channel 2 and the channel 1, then reaches the channel 13 and the channel 14 through the methane column, and reaches the FID detector through the electromagnetic valve. The carrier gas 2 passes through a channel 8 to a channel 7 and then passes through a total hydrocarbon column to reach the FID detector, and hydrogen and hydrocarbon-removing air are used as combustion-supporting gas.
Referring to fig. 2, the analysis and detection mode of the sample gas is as follows: the multi-channel sample valve switches a flow path to a state shown in figure 2 after realizing quantitative collection of sample gas, in the state, the sample gas sequentially passes through a channel 11, a channel 10 and a channel 5 of the multi-channel sample valve to reach a channel 4, so that the sample gas is exhausted in opposite directions, a carrier gas 2 passes through a channel 8 and a channel 9 of the multi-channel sample valve to reach a first quantitative ring, the sample gas carrying the first quantitative ring reaches a methane column through a channel 12 and a channel 13, passes through the methane column, enters a channel 1 and a channel 14, and then reaches an FID detector through an electromagnetic valve. The carrier gas 1 carries the sample gas in the second quantitative ring through the channel 2 and the channel 3, the sample gas reaches the total hydrocarbon column through the channel 6 and the channel 7, the sample gas enters the FID detector through the total hydrocarbon column, and the total hydrocarbon content in the sample gas can be detected before the methane peak appears due to the weak retention capacity of the total hydrocarbon column. And subtracting the content of methane from the content of the total hydrocarbons to obtain the data of the non-methane total hydrocarbons.
Referring to the attached figure 1, in a back-blowing state: after the content of total hydrocarbon and methane is measured in the analysis stage, the flow path is switched to a quantitative collecting state by the multi-channel sample injection valve, the carrier gas 1 is reversely blown through the channel 2 and the channel 1 to obtain a methane column, non-methane substances in the methane column are blown out of the methane column, and then reach the electromagnetic valve through the channel 13 and the channel 14, the electromagnetic valve is switched to an empty state, and the carrier gas 1 can blow the non-methane substances out of the chromatographic column into the air, so that the rapid detection of the whole device is realized.
The heating mode is turned on so that the above process is performed at a proper temperature.
The detection device of the embodiment adopts a fourteen-way valve to realize the detection of non-methane total hydrocarbons by the double columns in the HJ38-2017 standard, simplifies the flow and solves the problem that the existing detection device for non-methane total hydrocarbons is complex in structure. The detection device for the methane non-methane total hydrocarbons, which adopts the fourteen-way valve to replace the common detection device for the methane non-methane total hydrocarbons, has the advantages of simple structure, convenient installation and operation and the like.
Claims (3)
1. The detection device for the non-methane total hydrocarbons is characterized by comprising a multi-channel sample injection valve, a first quantitative ring, a second quantitative ring and a detector, wherein a switchable quantitative mode and a detection mode are formed by the multi-channel sample injection valve; the quantitative mode is a sample gas channel comprising a first quantitative ring and a second quantitative ring; the detection mode comprises two carrier gas channels, wherein one carrier gas channel comprises a first quantitative ring and a methane column, and the other carrier gas channel comprises a second quantitative ring and a total hydrocarbon column; the two carrier gas channels are connected with the detector; the first quantitative ring and a carrier gas channel of the methane column are connected with a detector through an electromagnetic valve; the multichannel sampling valve is a fourteen-way valve, and the electromagnetic valve is a two-position three-way valve.
2. The apparatus for detecting non-methane total hydrocarbons according to claim 1, wherein said apparatus is disposed in a temperature-programmed high-temperature chamber.
3. The apparatus for detecting non-methane total hydrocarbons according to claim 1, wherein said detector uses FID detection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920199408.4U CN209894763U (en) | 2019-02-15 | 2019-02-15 | Detection apparatus for non-methane total hydrocarbon |
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| CN201920199408.4U CN209894763U (en) | 2019-02-15 | 2019-02-15 | Detection apparatus for non-methane total hydrocarbon |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323525A (en) * | 2020-04-10 | 2020-06-23 | 苏州天蓝分析仪器有限公司 | Non-methane total hydrocarbon and benzene series concentration on-line analysis and detection device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323525A (en) * | 2020-04-10 | 2020-06-23 | 苏州天蓝分析仪器有限公司 | Non-methane total hydrocarbon and benzene series concentration on-line analysis and detection device |
| CN111323525B (en) * | 2020-04-10 | 2022-06-14 | 苏州天蓝分析仪器有限公司 | Non-methane total hydrocarbon and benzene series concentration on-line analysis and detection device |
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