CN216350535U - System for measuring non-methane total hydrocarbon by portable catalysis method - Google Patents
System for measuring non-methane total hydrocarbon by portable catalysis method Download PDFInfo
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- CN216350535U CN216350535U CN202122729798.1U CN202122729798U CN216350535U CN 216350535 U CN216350535 U CN 216350535U CN 202122729798 U CN202122729798 U CN 202122729798U CN 216350535 U CN216350535 U CN 216350535U
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Abstract
The utility model relates to a system for measuring non-methane total hydrocarbons by a portable catalytic method. The utility model comprises the following steps: the input unit is used for inputting and transmitting the sample gas; the flow stabilizing unit is connected with the input unit; the heating unit is connected with the flow stabilizing unit and is used for heating the sample gas; the methane way unit comprises a first control valve and a catalyst, and the catalyst is connected with the heating unit through the first control valve; the total hydrocarbon path unit comprises a second control valve and a total hydrocarbon column, and the total hydrocarbon column is connected with the heating unit through the second control valve; and the detection unit is respectively connected with the total hydrocarbon column and the catalyst. The utility model does not need to rely on a high-temperature membrane valve to switch flow paths, does not need a chromatographic column to carry out separation operation, adopts a catalysis method, and only needs one path of total hydrocarbon column and one path of catalysis pipe to realize the on-line detection of the non-methane total hydrocarbon.
Description
Technical Field
The utility model relates to the technical field of gas monitoring, in particular to a system for measuring non-methane total hydrocarbons by a portable catalysis method.
Background
Non-methane total hydrocarbons (NMHC) generally refer to all volatile hydrocarbons except methane, the NMHC in the atmosphere exceeds a certain concentration, is directly harmful to human health, can generate photochemical reaction under certain conditions through sunlight irradiation to generate substances such as ozone and the like, is a leading factor of haze and PM2.5, and can generate photochemical smog through sunlight irradiation under certain conditions to cause harm to the environment and human beings. Therefore, it is necessary to monitor and control non-methane total hydrocarbons in areas such as ambient air and plant boundaries.
The traditional portable non-methane total hydrocarbon system has the defects of complex gas circuit structure, complex instrument structure, high cost and the like due to the fact that a series of auxiliary facilities such as a high-temperature membrane valve, a chromatographic column and the like are needed.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the utility model is to overcome the problems of complicated instrument structure, high cost and the like caused by the fact that a portable non-methane total hydrocarbon system and a gas circuit in the prior art have complicated structures and a series of auxiliary facilities such as a high-temperature membrane valve, a chromatographic column and the like are required.
In order to solve the technical problem, the utility model provides a system for measuring non-methane total hydrocarbons by a portable catalytic method, which comprises the following steps: the input unit is used for inputting and transmitting the sample gas; the flow stabilizing unit is connected with the input unit and is used for controlling the sample injection flow of the sample gas; the heating unit is connected with the flow stabilizing unit and is used for heating the sample gas; the methane way unit comprises a first control valve and a catalyst for catalyzing non-methane total hydrocarbons, and the catalyst is connected with the heating unit through the first control valve; the total hydrocarbon path unit comprises a second control valve and a total hydrocarbon column, and the total hydrocarbon column is connected with the heating unit through the second control valve; the detection unit is used for detecting total hydrocarbons and is respectively connected with the total hydrocarbon column and the catalyst.
In one embodiment of the utility model, the input unit comprises a high temperature pump for introducing the sample gas, the high temperature pump comprising an inlet for the sample gas.
In an embodiment of the present invention, the flow stabilizing unit is a flow stabilizing gas circuit.
In one embodiment of the utility model, a flow dividing unit is arranged between the input unit and the flow stabilizing unit, and the flow dividing unit is used for dividing the sample gas delivered by the input unit.
In one embodiment of the present invention, the flow dividing unit is a damper tube.
In one embodiment of the utility model, the first control valve and the second control valve are both two-way solenoid valves.
In one embodiment of the utility model, the total hydrocarbon column is a passivated stainless steel or tetrafluorinated tube.
In one embodiment of the utility model, the catalyst is a tube filled with a catalyst for catalyzing non-methane total hydrocarbons.
In one embodiment of the utility model, the system further comprises a three-way valve, and the detection unit is respectively connected with the total hydrocarbon column and the catalyst through the three-way valve.
In one embodiment of the utility model, the detection unit comprises one of a FID detector, a PID detector, a thermal conductivity detector, a chromatograph.
Compared with the prior art, the technical scheme of the utility model has the following advantages:
the system for measuring the non-methane total hydrocarbons by the portable catalysis method is different from the traditional system for switching the flow path by a high-temperature membrane valve in the non-methane total hydrocarbons, does not need a chromatographic column for separation operation, and can realize the on-line detection of the non-methane total hydrocarbons by only one total hydrocarbon column and one catalysis pipe by adopting the catalysis method.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic diagram of the overall structure of a system for measuring non-methane total hydrocarbons by a portable catalytic method.
The specification reference numbers indicate: 1. an inlet; 2. a high temperature pump; 3. a damper tube; 4. a flow stabilizing unit; 5. a heating unit; 6. a first control valve; 7. a second control valve; 8. a catalyst; 9. a total hydrocarbon column; 10. a three-way valve; 11. a detection unit.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1, a system for measuring non-methane total hydrocarbons by a portable catalytic method according to the present invention includes:
the input unit is used for inputting and transmitting the sample gas;
the flow stabilizing unit 4 is connected with the input unit, and the flow stabilizing unit 4 is used for controlling the sample introduction flow of the sample gas;
the heating unit 5 is connected with the flow stabilizing unit 4, and the heating unit 5 is used for heating the sample gas;
the methane way unit comprises a first control valve 6 and a catalyst 8 for catalyzing non-methane total hydrocarbons, and the catalyst 8 is connected with the heating unit 5 through the first control valve 6;
a total hydrocarbon path unit which comprises a second control valve 7 and a total hydrocarbon column 9, wherein the total hydrocarbon column 9 is connected with the heating unit 5 through the second control valve 7;
and the detection unit 11 is used for detecting total hydrocarbons, and the detection unit 11 is respectively connected with the total hydrocarbon column 9 and the catalyst 8.
Specifically, the input unit comprises a high temperature pump 2 for introducing the sample gas, and the high temperature pump 2 comprises an inlet 1 for the sample gas.
Specifically, the flow stabilizing unit 4 is a flow stabilizing air passage in the prior art, and may also be another device having a pressure stabilizing or flow stabilizing function. By introducing the flow stabilizing unit 4, the accurate control of the sample injection flow can be realized, the accuracy of the measurement result of the instrument is improved, and the problems of sample flow difference and inaccurate measurement result caused by unstable pressure or flow of the sample injection device are solved.
Specifically, be equipped with the reposition of redundant personnel unit between input unit and stationary flow unit 4, the reposition of redundant personnel unit is used for shunting the sample gas that the input unit carried, the reposition of redundant personnel unit is damping tube 3.
Specifically, the first control valve 6 and the second control valve 7 are both two-way solenoid valves. The two-way electromagnetic valve of the methane path unit and the two-way electromagnetic valve of the total hydrocarbon path unit can replace a ten-way membrane valve required by flow path selection in a primary color spectrum method, and the cost of the instrument is reduced.
Specifically, the total hydrocarbon column 9 is a passivated stainless steel pipe or a tetrafluoride pipe or other pipe fittings with an anti-adsorption function, the inner diameter of the total hydrocarbon column can be selected within the range of 0.1-1mm according to actual conditions, and the length of the total hydrocarbon column is selected within the range of 0.1-2 m.
Specifically, the catalyst 8 is a pipe filled with a catalyst (such as OC-2) for catalyzing non-methane total hydrocarbons, the inner diameter can be selected to be in the range of 1-4mm according to actual conditions, and the length is selected to be 0.1-2 m; the arrangement of the catalyst 8 can replace a chromatographic column required by separation in primary chromatography, and the service life of the instrument is prolonged.
Specifically, the system further comprises a three-way valve 10, and the detection unit 11 is respectively connected with the total hydrocarbon column 9 and the catalyst 8 through the three-way valve 10.
Specifically, the detection unit 11 includes one of an FID detector, a PID detector, a thermal conductivity detector, and a chromatograph.
The principle is as follows: a sample enters a detection system from a sample gas inlet 1 under the action of a high-temperature pump 2, one part of the sample is divided by a flow dividing unit, the other part of the sample enters a flow stabilizing unit 4 and then enters a heating unit 5, and when methane analysis is required, the sample enters a catalyst 8 through a first electromagnetic valve of a methane path and then enters a detection unit 11 through a three-way valve 10; when the total hydrocarbon analysis is needed, the sample enters the total hydrocarbon column 9 through the second electromagnetic valve of the total hydrocarbon path, then passes through the three-way valve 10, and finally enters the detection unit 11.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the spirit or scope of the utility model.
Claims (10)
1. A system for portable catalytic measurement of non-methane total hydrocarbons, comprising:
the input unit is used for inputting and transmitting the sample gas;
the flow stabilizing unit is connected with the input unit and is used for controlling the sample injection flow of the sample gas;
the heating unit is connected with the flow stabilizing unit and is used for heating the sample gas;
the methane way unit comprises a first control valve and a catalyst for catalyzing non-methane total hydrocarbons, and the catalyst is connected with the heating unit through the first control valve;
the total hydrocarbon path unit comprises a second control valve and a total hydrocarbon column, and the total hydrocarbon column is connected with the heating unit through the second control valve;
the detection unit is used for detecting total hydrocarbons and is respectively connected with the total hydrocarbon column and the catalyst.
2. The system for measuring non-methane total hydrocarbons according to claim 1, wherein the input unit comprises a high temperature pump for introducing the sample gas, and the high temperature pump comprises an inlet for introducing the sample gas.
3. The system for measuring non-methane total hydrocarbons by the portable catalytic method according to claim 1, wherein the flow stabilizing unit is a flow stabilizing gas circuit.
4. The system for measuring non-methane total hydrocarbons by the portable catalytic method according to claim 1, wherein a flow dividing unit is arranged between the input unit and the flow stabilizing unit, and the flow dividing unit is used for dividing the sample gas delivered by the input unit.
5. The system for measuring non-methane total hydrocarbons by the portable catalytic method according to claim 4, wherein the flow dividing unit is a damping pipe.
6. The system for measuring non-methane total hydrocarbons by the portable catalytic method according to claim 1, wherein the first control valve and the second control valve are both two-way solenoid valves.
7. The system for measuring non-methane total hydrocarbons by the portable catalytic method according to claim 1, wherein the total hydrocarbon column is a passivated stainless steel pipe or a tetrafluoride pipe.
8. The system for measuring non-methane total hydrocarbons according to claim 1, wherein the catalyst is a pipe filled with a catalyst for catalyzing the non-methane total hydrocarbons.
9. The system for measuring non-methane total hydrocarbons by the portable catalytic method according to claim 1, further comprising a three-way valve, wherein the detection unit is respectively connected with the total hydrocarbon column and the catalyst by the three-way valve.
10. The system of claim 1, wherein the detection unit comprises one of a FID detector, a PID detector, a thermal conductivity detector, and a chromatograph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122729798.1U CN216350535U (en) | 2021-11-09 | 2021-11-09 | System for measuring non-methane total hydrocarbon by portable catalysis method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122729798.1U CN216350535U (en) | 2021-11-09 | 2021-11-09 | System for measuring non-methane total hydrocarbon by portable catalysis method |
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| CN216350535U true CN216350535U (en) | 2022-04-19 |
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| CN202122729798.1U Active CN216350535U (en) | 2021-11-09 | 2021-11-09 | System for measuring non-methane total hydrocarbon by portable catalysis method |
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- 2021-11-09 CN CN202122729798.1U patent/CN216350535U/en active Active
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