CN110967229A - Trace-level atmospheric volatile organic compound sampling device and sampling method - Google Patents
Trace-level atmospheric volatile organic compound sampling device and sampling method Download PDFInfo
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- CN110967229A CN110967229A CN201911388072.7A CN201911388072A CN110967229A CN 110967229 A CN110967229 A CN 110967229A CN 201911388072 A CN201911388072 A CN 201911388072A CN 110967229 A CN110967229 A CN 110967229A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
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Abstract
The invention discloses a trace atmosphere volatile organic compound sampling device and a sampling method, wherein the sampling device comprises a sampling system, a multi-way valve, a power system, a cold trap system, an analysis system and a carrier gas system, wherein the cold trap system comprises a refrigeration cavity and an enrichment pipe arranged in the refrigeration cavity, two ends of the enrichment pipe are respectively connected with two branch pipe channels of the multi-way valve, the cold trap system also comprises a refrigeration wafer, a refrigeration surface of the refrigeration wafer is in fit connection with the refrigeration cavity, and a group of radiating fins are arranged on a radiating surface of the refrigeration wafer; two ends of the enrichment pipe are respectively connected with two stages of transformers through motors, the transformers are connected with a power supply, and the enrichment pipe provides electric power for heating through voltage reduced by the transformers. The invention solves the problems that the liquid nitrogen refrigeration technology in the prior art needs to continuously add liquid nitrogen and has limited use environment, and has the advantages of simple operation, full automation, stable long-term function and less maintenance.
Description
Technical Field
The invention relates to a sample gas collection technology, in particular to a trace-level atmospheric volatile organic compound sampling device and a sampling method.
Background
Atmospheric volatile organics can participate in the nitrogen oxide reaction under the action of outdoor light and heat and form ozone, which can lead to poor air quality and is a major component of smoke in summer. Human hazards can be classified into three types: one is odor and sensory, including organ irritation, feeling dry; secondly, the morbidity caused by mucosa stimulation and other system toxicity; third, genotoxicity and carcinogenicity. Because the concentration is low, the requirement of the detection limit of an analytical instrument can be met only by pretreatment, and currently, a sampling tube is mostly adopted for sampling outdoors, and the sampling tube is sealed and taken to a laboratory for gas chromatography analysis. However, the method often cannot reflect the pollution degree of the atmosphere in real time, and the enriched sample often generates the defects of loss, inaccurate analysis result and the like, so that the real-time monitoring of the concentration of the atmospheric volatile organic compounds is increasingly important.
At present, most of devices for condensing atmospheric volatile organic compounds adopt liquid nitrogen for refrigeration, liquid nitrogen is evaporated to absorb heat for refrigeration, the amount of liquid nitrogen required by the method is large, the field is not beneficial to the storage of the liquid nitrogen, the cost is high, condensed water generated in sample gas also has large influence on a detection result, and the method is not suitable for continuous online monitoring.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a trace-level atmospheric volatile organic compound sampling device and a sampling method, and the sampling device and the sampling method are used for solving the problems that liquid nitrogen needs to be continuously added in a liquid nitrogen refrigeration technology in the prior art and the using environment is limited, and have the advantages of simple operation, full automation, long-term stable function and less maintenance.
The technical scheme adopted by the invention for solving the technical problems is as follows: a trace-level atmospheric volatile organic compound sampling device comprises a sampling system, a multi-way valve, a power system, a cold trap system, an analysis system and a carrier gas system, wherein the sampling system, the power system, the cold trap system, the analysis system and the carrier gas system are respectively connected with a branch pipe channel of the multi-way valve;
the cold trap system comprises a refrigeration cavity, an enrichment pipe arranged in the refrigeration cavity, a refrigeration wafer, a cooling surface of the refrigeration wafer and the refrigeration cavity, wherein two ends of the enrichment pipe are respectively connected with two branch pipe channels of a multi-way valve;
two ends of the enrichment pipe are respectively connected with two poles of a transformer through electrodes, the transformer is connected with a power supply, and the enrichment pipe provides power for heating through voltage reduced by the transformer.
Optionally, a fan is fixedly mounted on one side of the heat dissipation fins, and the airflow generated by the fan flows along the gap between the heat dissipation fins.
Optionally, the multi-way valve is a high temperature diaphragm six-way valve.
Optionally, the refrigeration face of refrigeration wafer pass through heat conduction silica gel with the laminating of refrigeration cavity is connected, the cooling surface of refrigeration wafer passes through heat conduction silica gel installation fin.
Optionally, the sampling system includes an atmosphere sampler, and the atmosphere sampler is connected to the multi-way valve.
Optionally, a dust and water removing device is arranged between the atmosphere sampler and the multi-way valve.
Optionally, the power system comprises a diaphragm pump and an electronic flow controller, the air inflow of the atmosphere sampler is controlled by the electronic flow controller, and the near-air power of the atmosphere sampler is provided by the diaphragm pump.
Optionally, the carrier gas system is connected to the multi-way valve through an electromagnetic valve.
The invention also provides a trace-level atmospheric volatile organic compound sampling method, which comprises the following steps:
the multi-way valve is switched to a sampling state, and simultaneously, the sampling system is driven by the power system to collect sample gas;
switching the multi-way valve to an air inlet state, starting a carrier gas system, and driving the sample gas into the enrichment pipe through a power system and the carrier gas system;
the transformer is connected with a power supply to heat the enrichment pipe, so that the enrichment pipe is heated, volatile organic compounds in the sample gas are separated out, and the volatile organic compounds are driven to the analysis system through the carrier gas system;
and after all the volatile organic compounds enter the analysis system, disconnecting the power supply of the transformer, cooling the enrichment pipe, closing the carrier gas system and switching the multi-way valve to a sampling state.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. when the sample gas is collected, the problems that liquid nitrogen needs to be continuously added in a liquid nitrogen refrigeration technology and the use environment is limited in the prior art are solved, and the device has the advantages of being simple in operation, full in automation, stable in long-term function and few in maintenance.
2. The invention adopts a mode that the enrichment pipe is directly pressurized by the transformer to heat the enrichment pipe, can quickly heat the enrichment pipe to the desorption temperature of the sample gas, and realizes quick flash evaporation of the sample gas.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a schematic diagram of the cold trap system of the present invention;
figure 3 is a schematic diagram of the structure of the enrichment tube of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the invention discloses a trace-level atmospheric volatile organic compound sampling device, which comprises a sampling system 1, a multi-way valve 2, a power system 3, a cold trap system 4, an analysis system 5 and a carrier gas system 6, wherein the sampling system 1, the power system 3, the cold trap system 4, the analysis system 5 and the carrier gas system 6 are respectively connected with branch pipe channels of the multi-way valve 2.
In the present invention, as shown in fig. 2, the cold trap system 4 specifically includes a refrigeration cavity 401 and an enrichment pipe 7 installed in the refrigeration cavity 401, the structure of the enrichment pipe 7 is shown in fig. 3, and the enrichment pipe 7 is used for enriching and separating volatile organic compounds (such as benzene series), and separating the volatile organic compounds from the sample gas. The two ends of the enrichment pipe 7 are respectively connected with two branch pipe channels of the multi-way valve 2, the cold trap system 4 further comprises a refrigeration wafer 402, the refrigeration surface of the refrigeration wafer 402 is attached to the refrigeration cavity 401, a group of cooling fins 403 are arranged on the cooling surface of the refrigeration wafer 402, a fan 404 is fixedly arranged on one side of each cooling fin 403, and air flow generated by the fan 404 flows along gaps among the cooling fins 403, so that heat is taken away, and the cooling effect is achieved.
In the invention, the refrigerating surface of the refrigerating wafer 402 is attached to the refrigerating cavity 401 through the heat-conducting silica gel, and the heat-radiating surface of the refrigerating wafer 402 is provided with the heat-radiating fins 403 through the heat-conducting silica gel, so that the heat transfer efficiency can be improved, and the heat-radiating speed can be accelerated.
In the invention, two ends of the enrichment pipe 7 are respectively connected with two poles of a transformer 8 through electrodes, the transformer 8 is connected with a power supply, and the enrichment pipe 7 provides power for heating through the voltage reduced by the transformer 8.
In the invention, the sampling system 1 comprises an atmosphere sampler, the atmosphere sampler is connected with the multi-way valve 2, a dust and water removing device is arranged between the atmosphere sampler and the multi-way valve 2, and sample gas enters the multi-way valve 2 after dust and water removal through the dust and water removing device. In addition, in the invention, the multi-way valve 2 can adopt a high-temperature diaphragm six-way valve, and the valve body is provided with exactly six branch pipe channels, so that the requirement of a sampling device can be met. The dust-removing dehydrator can adopt the conventional dust-removing dehydrator adopted at present.
In the present invention, the power system 3 includes a diaphragm pump and an electronic flow controller, the air intake amount of the air sampler is controlled by the electronic flow controller, and the near-air power of the air sampler is provided by the diaphragm pump. The carrier gas system 6 is connected with the multi-way valve 2 through an electromagnetic valve, and the on-off of the carrier gas system 6 is controlled through the electromagnetic valve.
The sampling device of the invention comprises the following steps:
s1, firstly, the multi-way valve 2 is switched to a sampling state, namely, the multi-way valve 2 is connected with the sampling system 1 and the power system 3, the sampling system 1 is driven by the power system 3 to collect sample gas, and the sample gas is accurately quantified through the electronic flow controller.
S2, after the sample gas enters the electronic flow controller, the multi-way valve 2 is switched to the gas inlet state, the carrier gas system 6 is started, and the sample gas is driven into the enrichment pipe 7 through the dual functions of the power system 3 and the carrier gas system 6;
s3, when the sample gas enters the enrichment pipe 7, the transformer 8 is connected with a power supply to heat the enrichment pipe 7, so that the enrichment pipe 7 is heated, the volatile organic compounds in the sample gas are separated out, and the volatile organic compounds are driven into an analysis system 5 through a carrier gas system 6, wherein the analysis system can be a gas chromatograph, for example;
and S4, after all volatile organic compounds enter the analysis system 5, disconnecting the power supply of the transformer 8, cooling the enrichment pipe 7, simultaneously closing the carrier gas system 6, switching the multi-way valve 2 to a sampling state, and entering the next sampling procedure after the refrigeration cavity 401 is cooled to the set temperature.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Other technical features than those described in the specification are known to those skilled in the art, and are not described herein in detail in order to highlight the innovative features of the present invention.
Claims (9)
1. A trace-level atmospheric volatile organic compound sampling device is characterized by comprising a sampling system, a multi-way valve, a power system, a cold trap system, an analysis system and a carrier gas system, wherein the sampling system, the power system, the cold trap system, the analysis system and the carrier gas system are respectively connected with a branch pipe channel of the multi-way valve;
the cold trap system comprises a refrigeration cavity, an enrichment pipe arranged in the refrigeration cavity, a refrigeration wafer, a cooling surface of the refrigeration wafer and the refrigeration cavity, wherein two ends of the enrichment pipe are respectively connected with two branch pipe channels of a multi-way valve;
two ends of the enrichment pipe are respectively connected with two poles of a transformer through electrodes, the transformer is connected with a power supply, and the enrichment pipe provides power for heating through voltage reduced by the transformer.
2. The trace level atmospheric volatile organic sampling device of claim 1, wherein a fan is fixedly mounted on one side of the heat sink, and the airflow generated by the fan flows along the gap between the heat sink.
3. The trace level atmospheric volatile organic sampling device of claim 2, wherein the multi-way valve is a high temperature diaphragm six-way valve.
4. The trace-level atmospheric volatile organic compound sampling device of claim 3, wherein the refrigeration surface of the refrigeration wafer is attached to the refrigeration cavity by thermally conductive silica gel, and the heat dissipation surface of the refrigeration wafer is provided with heat sinks by thermally conductive silica gel.
5. The trace level atmospheric volatile organic sampling device of claim 1, wherein the sampling system comprises an atmospheric sampler connected to the multi-way valve.
6. The trace-level atmospheric volatile organic compound sampling device according to claim 5, wherein a dust and water remover is disposed between the atmospheric sampler and the multi-way valve.
7. The trace-level atmospheric volatile organic sampling device according to claim 1, wherein the power system comprises a diaphragm pump and an electronic flow controller, the air intake of the atmospheric sampler is controlled by the electronic flow controller, and the near-air power of the atmospheric sampler is provided by the diaphragm pump.
8. The trace level atmospheric volatile organic sampling device of claim 1, wherein the carrier gas system is connected to the multi-ported valve through a solenoid valve.
9. A trace-level atmospheric volatile organic compound sampling method is characterized by comprising the following steps:
the multi-way valve is switched to a sampling state, and simultaneously, the sampling system is driven by the power system to collect sample gas;
switching the multi-way valve to an air inlet state, starting a carrier gas system, and driving the sample gas into the enrichment pipe through a power system and the carrier gas system;
the transformer is connected with a power supply to heat the enrichment pipe, so that the enrichment pipe is heated, volatile organic compounds in the sample gas are separated out, and the volatile organic compounds are driven to the analysis system through the carrier gas system;
and after all the volatile organic compounds enter the analysis system, disconnecting the power supply of the transformer, cooling the enrichment pipe, closing the carrier gas system and switching the multi-way valve to a sampling state.
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| CN201911388072.7A CN110967229A (en) | 2019-12-27 | 2019-12-27 | Trace-level atmospheric volatile organic compound sampling device and sampling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115718029A (en) * | 2022-11-16 | 2023-02-28 | 泰通科技（广州）有限公司 | Three-stage refrigeration atmosphere preconcentrator and temperature control method thereof |
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| CN115718029A (en) * | 2022-11-16 | 2023-02-28 | 泰通科技（广州）有限公司 | Three-stage refrigeration atmosphere preconcentrator and temperature control method thereof |
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Application publication date: 20200407 |