CN213903428U - Non-methane total hydrocarbon analysis device - Google Patents
Non-methane total hydrocarbon analysis device Download PDFInfo
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- CN213903428U CN213903428U CN202022063492.2U CN202022063492U CN213903428U CN 213903428 U CN213903428 U CN 213903428U CN 202022063492 U CN202022063492 U CN 202022063492U CN 213903428 U CN213903428 U CN 213903428U
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Abstract
The utility model provides a non-methane total hydrocarbon analysis device, which comprises an enrichment pipe, a temperature control unit and a detector; two ends of the chromatographic column are communicated with the port of the switching valve and are used for separating oxygen and methane in the gas to be detected; two ends of the quantitative unit are communicated with the port of the switching valve; when the switching valve is switched to the first state, the sample gas sequentially passes through the switching valve, the quantifying unit, the switching valve, the enrichment pipe and the switching valve; when the switching valve is switched to the second state, the first carrier gas sequentially passes through the switching valve, the enrichment pipe and the switching valve; when the switching valve is switched to a third state, the first carrier gas sequentially passes through the switching valve, the enrichment pipe, the switching valve and the detector; when the switching valve is switched to the fourth state, the second carrier gas passes through the switching valve, the quantitative unit, the switching valve, the chromatographic column, the switching valve and the detector in sequence; when the switching valve is switched to the fifth state, the second carrier gas passes through the switching valve, the column, and the switching valve in this order. The utility model has the advantages of detect accurately.
Description
Technical Field
The utility model relates to a gaseous detection, in particular to non-methane total hydrocarbon analytical equipment.
Background
At present, the principle of non-methane total hydrocarbon chromatographic analysis in ambient air is divided into indirect method and direct method. The indirect method mainly adopts two paths of double-valve flow paths to respectively measure concentration values of total hydrocarbons and methane, and the concentration values of the total hydrocarbons and the methane are subtracted to obtain the concentration of non-methane total hydrocarbons; the double-channel difference reduces the system error during measurement, and the measurement process of non-methane total hydrocarbon has the defects of insufficient accuracy, poor stability and the like.
The indirect method can be divided into the following two ways:
1. the back flushing method adopts the principle that methane is separated in a chromatographic column, and after the methane is discharged, carrier gas performs back flushing on the chromatographic column to reversely blow non-methane total hydrocarbons out of the chromatographic column to reach a detector. The defects are as follows: in the measurement process, the tailing of non-methane total hydrocarbon is obvious, the peak broadening is serious, the detection limit cannot meet the detection requirement, and the low concentration of a plurality of substances cannot be measured;
2. the enrichment method adopts the measurement principle of direct measurement of methane and oxygen, enrichment of non-methane total hydrocarbon at low temperature and high-temperature analysis. The defects are as follows: the existing enrichment method cannot realize separation of a methane peak and an oxygen peak, so that the oxygen peak can interfere accurate measurement of methane.
SUMMERY OF THE UTILITY MODEL
For solving the not enough among the above-mentioned prior art scheme, the utility model provides a detect accurate total hydrocarbon analytical equipment of non-methane.
The utility model aims at realizing through the following technical scheme:
the system comprises a non-methane total hydrocarbon analysis device and a non-methane total hydrocarbon analysis device, wherein the non-methane total hydrocarbon analysis device comprises an enrichment pipe, a temperature control unit and a detector; the non-methane total hydrocarbon analysis device further comprises:
the two ends of the chromatographic column are communicated with the ports of the switching valve and are used for separating oxygen and methane in the gas to be detected;
a quantitative unit with two ends communicated with the port of the switching valve
A switching valve, wherein when the switching valve is switched to a first state, the sample gas sequentially passes through the switching valve, the quantitative unit, the switching valve, the enrichment pipe and the switching valve; when the switching valve is switched to the second state, the first carrier gas sequentially passes through the switching valve, the enrichment pipe and the switching valve; when the switching valve is switched to a third state, the first carrier gas sequentially passes through the switching valve, the enrichment pipe, the switching valve and the detector; when the switching valve is switched to the fourth state, the second carrier gas passes through the switching valve, the quantitative unit, the switching valve, the chromatographic column, the switching valve and the detector in sequence; when the switching valve is switched to the fifth state, the second carrier gas passes through the switching valve, the column, and the switching valve in this order.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
this application adopts enrichment method to detect non-methane total hydrocarbon, and the integral measurement divide into two independent routes, corresponds non-methane total hydrocarbon and methane respectively, has realized:
the influence of oxygen and water vapor on methane detection is eliminated: separating methane, oxygen, water vapor and the like by using a chromatographic column, and carrying out back flushing and emptying on non-methane total hydrocarbons in the chromatographic column by using carrier gas after separation is finished;
the non-methane total hydrocarbon is enriched at low temperature, and is desorbed at high temperature, so that the detection limit is lower and the detection accuracy is high.
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 a non-methane total hydrocarbon analyzer according to example 1 of the present invention;
fig. 2 is a schematic diagram of a non-methane total hydrocarbon analysis apparatus according to embodiment 2 of the present invention.
Detailed Description
Fig. 1-2 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 a non-methane total hydrocarbon analysis apparatus according to an embodiment of the present invention, and as shown in fig. 1, the non-methane total hydrocarbon analysis apparatus includes:
an enrichment pipe 61, a temperature control unit 62 and a detector 81; these devices are all the prior art in the field, and the specific structure and operation are not described herein;
a chromatographic column 71, specifically adopting a PQ column, wherein two ends of the chromatographic column 71 are communicated with the port of the switching valve 15 and are used for separating oxygen and methane in the gas to be detected;
a quantitative unit 51, specifically adopting a quantitative ring, wherein two ends of the quantitative unit 51 are communicated with the port of the switching valve 15;
a switching valve 15, specifically adopting a fourteen-way valve, wherein a first port is communicated with the sample gas, a second port is communicated with the pump, a third port and a sixth port are respectively communicated with two ends of the enrichment tube, a fourth port is communicated with the first carrier gas, a fifth port and an eleventh port are communicated with the communication point, a seventh port and a fourteenth port are respectively communicated with two ends of the quantitative unit, an eighth port and a twelfth port are respectively communicated with two ends of the chromatographic column, a ninth port is communicated with the evacuation port, a tenth port is communicated with the first carrier gas and the pump, and a thirteenth port is communicated with the second carrier gas; the connected point is connected with the detector; so that, when the switching valve 15 is switched to the first state, the sample gas passes through the dosing unit 51 and the enrichment tube 61 in order of the switching valve 15, the dosing unit 51, the switching valve 15, the enrichment tube 61, the switching valve 15, the three-way valve 14, the mass flow meter 31, and the pump 41, and is forwarded through the dosing unit 51 and the enrichment tube 61; when the switching valve 15 is switched to the second state, the first carrier gas passes through the switching valve 15, the enrichment pipe 61 and the switching valve in sequence, and reversely passes through the enrichment pipe 61; when the switching valve 15 is switched to the third state, the first carrier gas passes through the switching valve 15, the enrichment pipe 61, the switching valve 15 and the detector 81 in sequence, and reversely passes through the enrichment pipe 61; when the switching valve 15 is switched to the fourth state, the second carrier gas passes through the column 71 in the forward direction sequentially through the switching valve 15, the quantifying unit 51, the switching valve 15, the column 71, the switching valve 15, and the detector 81; when the switching valve 15 is switched to the fifth state, the second carrier gas passes through the switching valve 15, the column 71 and the switching valve 15 in this order, and passes through the column 71 in the reverse direction;
filters 21-23, wherein the sample gas, the first carrier gas and the second carrier gas pass through the filters before entering the switching valve;
a first three-way valve 14, the first three-way valve 14 communicating with the pump 41, the second port, and the tenth port, respectively;
a second three-way valve 16, wherein the second three-way valve 16 is respectively communicated with the outlet of the quantitative unit, the seventh short coupling and the emptying port;
and the first standard gas and the second standard gas sequentially pass through the filter and the flow control unit and then enter the switching valve.
Example 2:
fig. 2 is a schematic structural diagram of a non-methane total hydrocarbon analysis apparatus according to an embodiment of the present invention, and as shown in fig. 2, the non-methane total hydrocarbon analysis apparatus includes:
an enrichment pipe 61, a temperature control unit 62 and a detector 81; these devices are all the prior art in the field, and the specific structure and operation are not described herein;
a chromatographic column 71, specifically adopting a PQ column, wherein two ends of the chromatographic column 71 are communicated with the port of the switching valve 15 and are used for separating oxygen and methane in the gas to be detected;
a quantitative unit 51, specifically adopting a quantitative ring, wherein two ends of the quantitative unit 51 are communicated with the port of the switching valve 15;
a switching valve, the switching valve comprising:
the first valve 11 is provided with a plurality of ports, wherein the first port is communicated with the sample gas, the second port is communicated with the thirteenth port of the second valve, the third port and the tenth port are respectively communicated with two ends of the quantitative unit, the fourth port and the eighth port are respectively communicated with two ends of the chromatographic column, the fifth port is communicated with the evacuation port, the sixth port is communicated with the second carrier gas and the pump, the seventh port is communicated with the communication point, and the ninth port is communicated with the second carrier gas;
a second valve 12, wherein the second valve 12 is provided with a plurality of ports, a twelfth port and a fifteenth port are respectively communicated with two ends of the enrichment pipe, a sixteenth port is communicated with the first carrier gas, and an eleventh port is communicated with the communication point; the connected point is connected with the detector;
so that when the switching valve is switched to the first state, the sample gas passes through the metering unit 51 and the enrichment pipe 61 in a forward direction, sequentially through the first valve 11, the metering unit 51, the first valve 11, the first multi-way valve 13, the second valve 12, the enrichment pipe 61, the second valve 12, the second multi-way valve 14, the mass flow meter 31, and the pump 41; when the switching valve is switched to the second state, the first carrier gas passes through the second valve 12, the enrichment pipe 61 and the second valve 12 in order, and reversely passes through the enrichment pipe 61; when the switching valve is switched to the third state, the first carrier gas passes through the second valve 12, the enrichment pipe 61, the second valve 12 and the detector 81 in order, and reversely passes through the enrichment pipe 61; when the switching valve is switched to the fourth state, the second carrier gas passes through the first valve 11, the quantifying unit 51, the first valve 11, the chromatographic column 71, the first valve 11 and the detector 81 in sequence, and passes through the quantifying unit 51 in the forward direction and the chromatographic column 71 in the forward direction; when the switching valve is switched to the fifth state, the second carrier gas passes through the first valve 11, the column 71, and the first valve 11 in this order, and passes through the column 71 in the reverse direction.
Filters 21-23, wherein the sample gas, the first carrier gas and the second carrier gas pass through the filters before entering the switching valve;
the first standard gas and the second standard gas sequentially pass through the filter and the flow control unit and then enter the switching valve;
the port of the first multi-way valve 13 is communicated with the second port, the thirteenth port and the evacuation port respectively;
and the ports of the second multi-way valve 14 are communicated with the fourteenth port, the pump and the sixth port respectively.
Claims (5)
1. The non-methane total hydrocarbon analysis device comprises an enrichment pipe, a temperature control unit and a detector; the method is characterized in that: the non-methane total hydrocarbon analysis device further comprises:
the two ends of the chromatographic column are communicated with the ports of the switching valve and are used for separating oxygen and methane in the gas to be detected;
a quantitative unit with two ends communicated with the port of the switching valve
A switching valve, wherein when the switching valve is switched to a first state, the sample gas sequentially passes through the switching valve, the quantitative unit, the switching valve, the enrichment pipe and the switching valve; when the switching valve is switched to the second state, the first carrier gas sequentially passes through the switching valve, the enrichment pipe and the switching valve; when the switching valve is switched to a third state, the first carrier gas sequentially passes through the switching valve, the enrichment pipe, the switching valve and the detector; when the switching valve is switched to the fourth state, the second carrier gas passes through the switching valve, the quantitative unit, the switching valve, the chromatographic column, the switching valve and the detector in sequence; when the switching valve is switched to the fifth state, the second carrier gas passes through the switching valve, the column, and the switching valve in this order.
2. The non-methane total hydrocarbons analysis apparatus according to claim 1, characterized in that: the sample gas, the first carrier gas and the second carrier gas all pass through a filter before entering the switching valve.
3. The non-methane total hydrocarbons analysis apparatus according to claim 1, characterized in that: the switching valve is a fourteen-way valve, wherein a first port is communicated with sample gas, a second port is communicated with the pump, a third port and a sixth port are respectively communicated with two ends of the enrichment pipe, a fourth port is communicated with first carrier gas, a fifth port and an eleventh port are communicated with a communication point, a seventh port and a fourteenth port are respectively communicated with two ends of the quantitative unit, an eighth port and a twelfth port are respectively communicated with two ends of the chromatographic column, a ninth port is communicated with an evacuation port, a tenth port is communicated with the first carrier gas and the pump, and a thirteenth port is communicated with second carrier gas; the connected point is connected with the detector;
the first multi-way valve is communicated with the pump, the second port and the tenth port respectively;
and the second multi-way valve is respectively communicated with the outlet of the quantitative unit, the seventh port and the evacuation port.
4. The non-methane total hydrocarbons analysis apparatus according to claim 1, characterized in that: the switching valve includes:
the first valve is provided with a plurality of ports, wherein the first port is communicated with the sample gas, the second port is communicated with the thirteenth port of the second valve, the third port and the tenth port are respectively communicated with two ends of the quantitative unit, the fourth port and the eighth port are respectively communicated with two ends of the chromatographic column, the fifth port is communicated with the evacuation port, the sixth port is communicated with the second carrier gas and the pump, the seventh port is communicated with the communication point, and the ninth port is communicated with the second carrier gas;
a second valve having a plurality of ports, wherein a twelfth port and a fifteenth port are respectively communicated with two ends of the enrichment pipe, a sixteenth port is communicated with the first carrier gas, and an eleventh port is communicated with the communication point; the connected point is connected with the detector;
a port of the third multi-way valve is communicated with the second port, the thirteenth port and the evacuation port respectively;
and the ports of the fourth multi-way valve are respectively communicated with the fourteenth port, the pump and the sixth port.
5. The non-methane total hydrocarbons analysis apparatus according to claim 1, characterized in that: the chromatography column is a PQ column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022063492.2U CN213903428U (en) | 2020-09-20 | 2020-09-20 | Non-methane total hydrocarbon analysis device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022063492.2U CN213903428U (en) | 2020-09-20 | 2020-09-20 | Non-methane total hydrocarbon analysis device |
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| CN213903428U true CN213903428U (en) | 2021-08-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324718A (en) * | 2021-12-20 | 2022-04-12 | 杭州谱育科技发展有限公司 | Organic sulfur detection method based on chromatographic technique |
| CN114354791A (en) * | 2021-12-29 | 2022-04-15 | 杭州谱育科技发展有限公司 | Detection system and method for non-methane total hydrocarbons |
-
2020
- 2020-09-20 CN CN202022063492.2U patent/CN213903428U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324718A (en) * | 2021-12-20 | 2022-04-12 | 杭州谱育科技发展有限公司 | Organic sulfur detection method based on chromatographic technique |
| CN114354791A (en) * | 2021-12-29 | 2022-04-15 | 杭州谱育科技发展有限公司 | Detection system and method for non-methane total hydrocarbons |
| CN114354791B (en) * | 2021-12-29 | 2024-04-09 | 杭州谱育科技发展有限公司 | System and method for detecting non-methane total hydrocarbons |
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