WO2022126795A1 - Portable gas chromatography analysis device and analysis method - Google Patents

Abstract

A portable gas chromatography analysis device and an analysis method. The portable gas chromatography analysis device comprises a first sample injection pipe (11), a multi-port valve (20), a first pipeline (31), a second pipeline (32), a first carrier gas pipe (51), a discharge pipe (41), a third pipeline (33), a second carrier gas pipe (52), a suction pipe (42), a third carrier gas pipe (53), a pre-concentration trapping pipe (61), a thermal desorption element, an air pump (43), a chromatography analysis column (71), and a tester (72). When testing a sample under test, the sample under test does not need to enter a liquid sample injection module, but the sample under test which is heated and desorbed in the pre-concentration trapping pipe (61) is brought into the chromatography analysis column (71) by an introduced carrier gas and a subsequent test operation is performed, that is, no gas needs to be heated to 250°C and no liquid sample injection module needs to be controlled; thus, energy consumption can be reduced, and the control is relatively simple. In addition, while the chromatography analysis column (71) works, the pre-concentration trapping pipe and a connecting pipe thereof can be subjected to backflush for cleaning, and synchronization of the backflush process and the analysis process can shorten the analysis period and improve the working efficiency.

Description

Portable gas chromatography analysis device and analysis method technical field

The invention relates to the technical field of chromatographic analysis, in particular to a portable gas chromatographic analysis device and an analysis method.

Background technique

Traditionally, portable gas chromatographic analysis devices can realize direct gas injection and liquid injection, and can perform chromatographic analysis and detection of gas samples, as well as chromatographic analysis and detection of liquid samples. For the chromatographic analysis and detection of gas samples, the traditional common implementation method is to use the gas sample after pre-concentration and desorption, and then pass through the liquid sampling module, and then enter the chromatographic column for separation, and the separated chromatogram is detected by the detector. In order to prevent the existence of cold spots, the liquid sampling module must be heated and kept at 200℃～250℃ during the whole analysis process, the power consumption is large, and the battery power consumption is fast, which is not conducive to monitoring and analysis on site for a long time; To ensure the separation and detection effect, the liquid sampling module also needs to be set to split mode or splitless mode, and the control is extremely complicated.

SUMMARY OF THE INVENTION

Based on this, it is necessary to overcome the defects of the prior art, and to provide a portable gas chromatography analysis device and analysis method, which can save energy consumption and have simple control.

The technical scheme is as follows: a portable gas chromatographic analysis device, the portable gas chromatographic analysis device comprises: a first injection pipe, the air inlet end of the first injection pipe is used for introducing sample gas; a multi-port valve, The first pipeline, the second pipeline, the first carrier gas pipe, the discharge pipe, the third pipeline, the second carrier gas pipe, the suction pipe and the third carrier gas pipe, the multi-port valve is provided with a first interface, a second port, third port, fourth port, fifth port, sixth port, seventh port, eighth port, ninth port and tenth port, the first port is connected to the first port through the first pipeline The five ports are communicated with each other, the second port is communicated with the inlet end of the second pipeline, the third port is communicated with the outlet end of the first carrier gas pipe, and the fourth port is communicated with the The air inlet end of the discharge pipe is connected, the air outlet end of the discharge pipe is the gas discharge end, the sixth interface is communicated with the ninth interface through the third pipeline, and the seventh interface is respectively connected to the The gas outlet end of the first sample injection tube is communicated with the gas outlet end of the second carrier gas tube, the eighth interface is communicated with the suction tube, and the tenth interface is also communicated with the third carrier gas tube. The gas outlet ends are connected, and the gas inlet end of the first carrier gas pipe, the gas inlet end of the second carrier gas pipe and the gas inlet end of the third carrier gas pipe are all used for introducing carrier gas; the pre-concentration trapping pipe , thermal desorption part, air pump, chromatographic analysis column and detector, the pre-concentration trap tube is arranged on the third pipeline, and the thermal desorption part is used to desorb the pre-concentration trap tube by heating processing, the air pump is arranged on the suction pipe, the chromatographic analysis column is arranged on the second pipeline, and the gas outlet end of the second pipeline is communicated with the inlet of the detector;

The multi-port valve operates in the first working state and the second working state. When the multi-port valve operates in the first working state, the first port and the tenth port are connected through a pipeline, and the first port is connected to the tenth port. The second interface is communicated with the third interface through a pipeline, the fourth interface is communicated with the fifth interface through a pipeline, the sixth interface is communicated with the seventh interface through a pipeline, and the eighth interface is communicated through a pipeline. It is communicated with the ninth port through a pipeline; when the multi-way valve operates in the second working state, the first port is communicated with the second port through a pipeline, and the third port is connected with the first port. The four ports are communicated through pipes, the fifth port is communicated with the sixth port through pipes, the seventh port is communicated with the eighth port through pipes, and the ninth port is communicated with the tenth port connected by pipes.

When the above-mentioned portable gas chromatographic analysis device detects the sample to be tested, it does not need to enter the liquid sampling module, but the sample to be tested that is heated and desorbed in the pre-concentration trapping tube is brought into the chromatographic analysis by the incoming carrier gas. It is not necessary to heat the gas to 250°C, nor to control the liquid sampling module, which can save energy consumption and control is relatively simple.

In one embodiment, the portable gas chromatography analysis device further includes a guard column disposed on the first pipeline.

In one embodiment, the guard column is an inertized metal hollow capillary tube or a hollow quartz capillary tube; the guard column is detachably arranged on the first pipeline; the guard column is provided with a heating element and/or thermometer.

In one embodiment, the portable gas chromatography analysis device further comprises a first pressure controller arranged on the first carrier gas pipe, and a second pressure controller arranged on the third carrier gas pipe; the The third carrier gas pipe is provided with a first flow dividing piece, and the first flow dividing piece is connected with the intake end of the second carrier gas pipe.

In one embodiment, the portable gas chromatography analysis device further comprises a first 2/3-way valve disposed between the second carrier gas pipe and the seventh interface; the first 2/3-way valve The first interface and the second interface are arranged on the first sample injection pipe, and the third interface of the first two-position three-way valve is communicated with the gas outlet end of the second carrier gas pipe.

In one of the embodiments, the portable gas chromatographic analysis device further includes a second injection tube, and the second injection tube communicates with the seventh interface.

In one embodiment, the portable gas chromatographic analysis device further comprises a second 2/3-way valve disposed between the second sampling tube and the seventh interface; the second 2/3-way valve The first interface and the second interface of the valve are arranged on the first sampling tube, and the third interface of the second two-position three-way valve is communicated with the gas outlet end of the second sampling tube.

In one embodiment, the portable gas chromatographic analysis device further comprises a quantitative tube arranged in parallel with the pre-concentration trapping tube, and is used to control the access of the quantitative tube or the pre-concentration trapping tube to the Describe the control assembly of the third pipeline.

In one of the embodiments, the control assembly includes two third two-position three-way valves respectively located on both sides of the pre-concentration trapping pipe; the first interface of the third two-position three-way valve and the second The interface is arranged on the third pipeline, one end of the quantitative tube is communicated with the third interface of one of the third two-position three-way valves, and the other end of the quantitative tube is connected to the other third interface. The third ports of the two-position three-way valve are communicated with each other.

In one embodiment, the portable gas chromatographic analysis device further includes a liquid sampling module, a fourth 2/3-way valve, a fifth 2/3-way valve, a fourth carrier gas pipe, and a fourth pipeline. The first interface and the second interface of the four-two-position three-way valve are arranged on the first carrier gas pipe, and the third interface of the fourth two-position three-way valve is connected to the intake end of the fourth carrier gas pipe, The gas outlet end of the fourth carrier gas pipe is communicated with the carrier gas inlet of the liquid sampling module; the first interface and the second interface of the fifth two-position three-way valve are arranged on the first pipeline, so The third interface of the fifth two-position three-way valve is communicated with the carrier gas outlet of the liquid sampling module.

A portable gas chromatographic analysis method adopts the portable gas chromatographic analysis device, comprising the following steps:

Step S10, first make the multi-port valve run in the first working state, control the air pump to work, and the air pump makes the sample gas flow through the first sampling tube, the seventh interface, the sixth interface, the third pipeline, the ninth interface, and the first sample gas. Eight ports and suction pipe, when the sample gas flows through the third pipeline, the pre-concentration trap tube on the third pipeline captures and collects the sample to be tested in the sample gas, so that the sample to be tested is concentrated in the pre-concentration trap tube , and other gases are pumped out by the air pump through the suction pipe;

Step S20, after the pre-concentration trap tube captures a preset amount of the sample to be tested, the air pump stops working;

Step S30, after the air pump stops working, make the multi-way valve run in the second working state, and perform heating and desorption treatment on the pre-concentration trapping tube through the thermal desorption element, so that the sample to be tested in the pre-concentration trapping tube is vaporized and desorbed. The carrier gas introduced by the third carrier gas pipe flows through the tenth interface, the ninth interface, the third pipeline, the sixth interface, the fifth interface, the first pipeline, the first interface, the second interface and the second pipe. When the carrier gas introduced by the third carrier gas pipe enters the pre-concentration trapping pipe, it carries the vaporized sample to be tested into the second pipeline, and then enters the chromatographic analysis column from the second pipeline;

In step S40 , the chromatographic analysis column performs a heating operation, so that the vaporized sample to be tested is chromatographically separated, and the detector sequentially performs detection processing on the separated target substances.

The above-mentioned portable gas chromatographic analysis method does not need to enter the liquid sampling module, but the sample to be tested that is heated and desorbed in the pre-concentration trapping tube by the incoming carrier gas is brought into the chromatographic analysis column and subjected to subsequent detection. Action, that is, there is no need to heat the gas to 250°C, and there is no need to control the liquid sampling module, which can save energy and control is relatively simple.

In one of the embodiments, after the detection and processing step is finished, a backflushing cleaning step is further included:

Make the multi-port valve run in the first working state, the carrier gas introduced by the first carrier gas pipe flows through the third interface and the second interface into the second pipeline in turn, and the remaining sample to be tested in the chromatographic analysis column continues to move forward Push it into the detector for detection; the carrier gas introduced by the second carrier gas pipe flows through the seventh interface, the sixth interface, the third pipeline, the ninth interface, the eighth interface and the suction pipe in sequence, so that the pre-concentration trapping is carried out. The sample to be tested in the header is discharged to the outside; the carrier gas in the third carrier gas pipe flows through the tenth interface, the first interface, the first pipeline, the fifth interface, the fourth interface and the discharge pipe to be discharged to the outside.

In one embodiment, in step S30, after the air pump stops working and before the carrier gas introduced into the third carrier gas pipe enters the preset concentration and trapping pipe, a preheating and desorption step is also included, and the preheating and desorption step is performed according to the preset time. The concentration and trapping tube is heated and heated.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of the multi-port valve of the portable gas chromatographic analysis device operating in a first working state according to an embodiment of the present invention;

2 is a schematic structural diagram of the multi-port valve of the portable gas chromatographic analysis device operating in a second working state according to an embodiment of the present invention;

3 is a schematic structural diagram of a portable gas chromatography analysis device according to another embodiment of the present invention;

4 is a schematic structural diagram of a portable gas chromatographic analysis device according to another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a guard column of a portable gas chromatography analysis device according to an embodiment of the present invention.

11. The first sampling tube; 12. The second sampling tube; 20. Multi-port valve; A1, the first port; A2, the second port; A3, the third port; A4, the fourth port; A5, the fifth port Interface; A6, sixth interface; A7, seventh interface; A8, eighth interface; A9, ninth interface; A10, tenth interface; 31, first pipeline; 32, second pipeline; 33, third Pipeline; 34, guard column; 35, heating element; 36, temperature measuring element; 37, insulating layer; 38, fourth pipeline; 41, discharge pipe; 42, suction pipe; 43, air pump; 44, flow restriction 51, the first carrier gas pipe; 52, the second carrier gas pipe; 53, the third carrier gas pipe; 54, the fourth carrier gas pipe; 55, the first pressure controller; 56, the second pressure controller; 57, the first Splitting parts; 58, carrier gas main pipe; 59, second splitting parts; 59A, control gas pipe; 59B, electric control valve; 61, pre-concentration trapping tube; 62, quantitative tube; 71, chromatography column; ; 81, the first two-position three-way valve; 82, the second two-position three-way valve; 83, the third two-position three-way valve; 84, the fourth two-position three-way valve; 85, the fifth two-position three-way valve 90, liquid injection module; 91, body; 92, liquid injection end; 93, carrier gas inlet; 94, sample outlet; 95, septum purge line; 96, split line.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

Referring to FIG. 1 and FIG. 2, FIG. 1 shows a schematic structural diagram of the multi-port valve 20 of the portable gas chromatographic analysis device operating in the first working state according to an embodiment of the present invention, and FIG. 2 shows a portable gas chromatographic analysis device according to an embodiment of the present invention. The multi-port valve 20 of the device operates in the second working state. An embodiment of the present invention provides a portable gas chromatography analysis device. The portable gas chromatography analysis device includes a first sampling tube 11 , a multi-port valve 20 , a first pipeline 31 , a second pipeline 32 , and a first carrier gas tube 51 , discharge pipe 41, third pipe 33, second carrier gas pipe 52, suction pipe 42, third carrier gas pipe 53, pre-concentration capture pipe 61, thermal desorption parts (not shown in the figure), air pump 43, Chromatography column 71 and detector 72. Specifically, the multi-port valve 20 in this embodiment is a ten-port valve. Of course, the multi-port valve 20 may also be a 12-port valve, a 14-port valve, etc., which is not limited herein.

The gas inlet end of the first sampling tube 11 is used for introducing sample gas. The multi-port valve 20 is provided with a first port A1, a second port A2, a third port A3, a fourth port A4, a fifth port A5, a sixth port A6, a seventh port A7, an eighth port A8, and a ninth port A9 and the tenth interface A10. The first interface A1 is communicated with the fifth interface A5 through the first pipeline 31 , the second interface A2 is communicated with the inlet end of the second pipeline 32 , and the third interface A3 is communicated with the outlet end of the first carrier gas pipe 51 . , the fourth port A4 is connected to the intake end of the discharge pipe 41, the gas outlet end of the discharge pipe 41 is the gas discharge end, the sixth port A6 is communicated with the ninth port A9 through the third pipeline 33, and the seventh port A7 is respectively It is communicated with the gas outlet end of the first sampling tube 11 and the gas outlet end of the second carrier gas tube 52, the eighth interface A8 is communicated with the suction tube 42, and the tenth interface A10 is also communicated with the gas outlet end of the third carrier gas tube 53. , the inlet end of the first carrier gas pipe 51 , the inlet end of the second carrier gas pipe 52 and the inlet end of the third carrier gas pipe 53 are all used for introducing the carrier gas. The pre-concentration and trapping tube 61 is arranged on the third pipeline 33 , and the thermal desorption element is used for heating and desorbing the pre-concentration and trapping tube 61 . The air pump 43 is provided on the suction pipe 42 , and the chromatography column 71 is provided on the second pipeline 32 . The gas outlet end of the second pipeline 32 is communicated with the inlet of the detector 72 .

The multi-way valve 20 operates in the first working state and the second working state. Referring to FIG. 1 , when the multi-way valve 20 operates in the first working state, the first port A1 and the tenth port A10 are connected through a pipeline, and the second port A2 is connected to the third interface A3 through a pipeline, the fourth interface A4 is connected to the fifth interface A5 through a pipeline, the sixth interface A6 is connected to the seventh interface A7 through a pipeline, and the eighth interface A8 is connected to the ninth interface A9 through a pipeline 2, when the multi-way valve 20 operates in the second working state, the first interface A1 and the second interface A2 are connected through a pipeline, the third interface A3 and the fourth interface A4 are connected through a pipeline, and the fifth The interface A5 is communicated with the sixth interface A6 through a pipeline, the seventh interface A7 is communicated with the eighth interface A8 through a pipeline, and the ninth interface A9 is communicated with the tenth interface A10 through a pipeline.

Referring to FIG. 1 , in actual work, the multi-port valve 20 is first operated in the first working state, and the air pump 43 is controlled to work. The seventh port A7, the sixth port A6, the third pipeline 33, the ninth port A9, the eighth port A8 and the suction pipe 42, when flowing through the third pipeline 33, are captured by the pre-concentration on the third pipeline 33. The header 61 captures and collects the sample to be tested in the sample gas, so that the sample to be tested is concentrated in the pre-concentration capture tube 61, and other gases are pumped out by the air pump 43 through the suction tube 42, and the pre-concentration capture tube 61 After a certain amount of the sample to be tested is captured, the air pump 43 stops working. At the same time, the carrier gas in the third carrier gas pipe 53 can be discharged to the outside through the tenth port A10, the first port A1, the first pipeline 31, the fifth port A5, the fourth port A4 and the discharge pipe 41 in sequence. The carrier gas in a carrier gas pipe 51 can be discharged into the detector 72 through the third port A3, the second port A2 and the second pipeline 32 in sequence, so that the carrier gas source can not be stopped.

Referring to FIG. 2 , the multi-port valve 20 is then operated in the second working state, and the pre-concentration trap tube 61 is heated and desorbed by the thermal desorption element, so that the sample to be tested in the pre-concentration trap tube 61 is vaporized; and The carrier gas is introduced into the third carrier gas pipe 53, and the carrier gas flows through the tenth interface A10, the ninth interface A9, the third pipeline 33, the sixth interface A6, the fifth interface A5, the first pipeline 31, the first The interface A1, the second interface A2 and the second pipeline 32, so that the carrier gas enters the pre-concentration trap tube 61, so that the vaporized sample to be tested enters the second pipeline 32 together, and enters through the second pipeline 32. To the chromatographic analysis column 71 , the chromatographic analysis column 71 performs a heating operation to perform chromatographic separation of the vaporized sample to be tested, and the detector 72 sequentially performs detection processing on the separated chromatograms.

When the above-mentioned portable gas chromatography analysis device detects the sample to be tested, it does not need to enter the liquid sampling module 90, but the sample to be tested that is heated and desorbed in the pre-concentration trap tube 61 is brought into the sample by the incoming carrier gas. To the chromatographic analysis column 71 and perform subsequent detection actions, that is, there is no need to heat the gas to 250° C., and no need to control the liquid sampling module 90 , which can save energy and make the control relatively simple.

It should be noted that, when the thermal desorption element is working, for example, the pre-concentration tube is heated to 200 ℃ at a heating rate of 20 ℃/s to rapidly heat and gasify the sample to be tested. The device for heating the capture tube 61, such as a heating wire wound on the outer wall of the pre-concentration capture tube 61, or an electric heating wire placed on the inner wall of the pre-concentration capture tube 61, or using a semiconductor to transfer the generated heat to the pre-concentration capture tube The pipe 61 and the like are not specifically limited here. In addition, the air pump 43 may be any pump body capable of providing suction power to pump the gas in the sample injection tube into the pre-concentration trap tube 61 , which is not limited herein. Specifically, the air pump 43 can be a micro-diaphragm pump, which is small in size and light in weight, and is easy to carry. In addition, the chromatographic analysis column 71 is, for example, a low-thermal-capacity chromatographic column whose model is DB-5, the length, inner diameter, and film thickness are respectively 15 m×0.25 mm×0.25 μm, and the chromatographic analysis column 71 adopts a general temperature program mode for chromatographic separation. Work. Secondly, the detector 72 is specifically a mass spectrometer detector 72, a flame ionization detector or a thermal conductivity detector 72, etc., which is not limited herein. In this embodiment, the carrier gas is, for example, helium gas, hydrogen gas, nitrogen gas, or air, etc., which is not limited herein.

Referring to FIG. 1 again, in addition, when the chromatographic separation of the sample to be tested by the chromatographic analysis column 71 is about to end, the multi-port valve 20 is switched to operate in the first working state, and the carrier gas in the first carrier gas pipe 51 flows through the third The interface A3 and the second interface A2 enter the second pipeline 32, and the remaining sample to be tested in the chromatographic analysis column 71 is pushed forward into the detector 72 for detection; the carrier gas in the second carrier gas pipe 52 flows sequentially Through the seventh port A7, the sixth port A6, the third pipeline 33, the ninth port A9, the eighth port A8 and the suction pipe 42, the sample to be tested in the pre-concentration trapping tube 61 is discharged to the outside, and the Cleaning effect; the carrier gas in the third carrier gas pipe 53 flows through the tenth port A10, the first port A1, the first pipeline 31, the fifth port A5, the fourth port A4 and the discharge pipe 41 to be discharged to the outside. It can be seen that the chromatographic analysis column 71 can ensure a better detection effect of the sample to be tested. While the chromatographic analysis column 71 is working, the pre-concentration trapping pipe 61 and its connecting pipe can be backflushed and cleaned, and the backflushing process and analysis can be performed. The synchronization of the process can shorten the analysis cycle and improve the work efficiency.

Referring to FIG. 1 or FIG. 2 , further, the portable gas chromatography analysis device further includes a guard column 34 disposed on the first pipeline 31 . It should be noted that the chromatographic analysis column 71 mainly realizes the sequential separation and discharge of various components of the sample to be tested through the coating attached to the inner wall of the chromatographic analysis column 71 during operation, and the coating is, for example, polysiloxane. The main difference between the guard column 34 and the chromatographic analysis column 71 is that the inner wall of the guard column 34 has no coating, and the inner wall is exposed. Guard column 34 . In this way, after the carrier gas carries the sample to be tested through the guard column 34 on the first pipeline 31, it is sent to the second pipeline 32 and into the chromatographic analysis column 71, which is beneficial to remove the dirt in the sample to be tested. Impurities and the like are attached to the inner wall of the guard column 34, but will not be attached to the front section of the chromatographic analysis column 71, that is, the chromatographic analysis column 71 is protected to a certain extent, and the contamination of the chromatographic analysis column 71 by the sample to be tested is reduced, thereby improving the performance of the chromatographic analysis column 71. The service life of the chromatographic analysis column 71 is improved, the vacuum degree of the mass spectrometer is improved, and the chromatographic separation effect is improved. Specifically, the guard column 34 is selected from an inertized metal hollow capillary tube or a hollow quartz capillary tube, etc., which is not limited herein.

Referring to FIG. 1 and FIG. 5 , FIG. 5 shows a schematic structural diagram of a guard column 34 of a portable gas chromatographic analysis device according to an embodiment of the present invention. In addition, the protection column 34 is detachably provided on the first pipeline 31 , so that the protection column 34 can be easily removed and replaced. Specifically, the inner diameter of the guard column 34 is 0.25 mm or 0.28 mm, and the length of the guard column 34 is, for example, 5 cm to 30 cm. In addition, the guard column 34 is provided with a heating element 35 and/or a temperature measuring element 36 . Specifically, the heating wire is wound on the protective column 34 covered with the insulating layer 37 , and the temperature measuring element 36 uses, for example, a thermocouple to measure the temperature of the protective column 34 . In addition, a thermal insulation layer (not shown in the figure) can also be provided on the protective column 37, and the insulating layer is, for example, a 0.03 mm-0.06 mm quartz fiber cloth insulating layer. The thermal insulation layer is, for example, nano-felt with a thickness of 5 mm to 10 mm, or high-silica cotton. Specifically, the heating temperature of the heating element 35 is controlled at, for example, 50°C to 150°C, so as to prevent the sample to be tested from being condensed by encountering a cold spot in the pipeline, thereby reducing the loss of the sample to be tested.

Optionally, the heating element 35 is not limited to a heating wire, but can also be any device capable of heating the guard column 34, such as a heating wire built into the guard column 34, or a semiconductor to transfer the generated heat to the guard. The column 34 and the like are not specifically limited here.

Referring to FIG. 1 and FIG. 2 , in one embodiment, the portable gas chromatographic analysis device further includes a flow restrictor 44 disposed on the discharge pipe 41 ; or, the discharge pipe 41 is a flow restrictor. In this way, the flow restrictor 44 can limit the discharge flow rate of the discharge pipe 41 , and can reduce the amount of carrier gas discharged from the discharge pipe 41 to save the amount of carrier gas. Alternatively, the discharge pipe 41 with a smaller diameter can also be selected as the restrictor pipe. For example, the diameter of the discharge pipe 41 is 0.1mm, 0.125mm, 0.15m, 0.2mm, etc. The specific size can be set according to the actual situation. This is not limited.

Referring to FIGS. 1 and 2 , in one embodiment, the portable gas chromatography analysis device further includes a first pressure controller 55 disposed on the first carrier gas pipe 51 and a second pressure controller disposed on the third carrier gas pipe 53 device 56. The third carrier gas pipe 53 is provided with a first flow splitting member 57 , and the first flow splitting member 57 is connected to the intake end of the second carrier gas pipe 52 . In this way, on the one hand, the pressure of the carrier gas entering the first carrier gas pipe 51 can be controlled by the first pressure controller 55, and the pressure of the carrier gas on the third carrier gas pipe 53 can be controlled by the second pressure controller 56; On the one hand, since the second carrier gas pipe 52 is connected to the third carrier gas pipe 53 through the first flow divider 57, the pressure of the carrier gas on the second carrier gas pipe 52 can be controlled, so that the first carrier gas pipe 51 and the second carrier gas pipe 52 And the air pressure on the third carrier gas pipe 53 meets the preset requirements.

Specifically, the first shunt 57 is a shunt three-way valve, two ports of the shunt three-way valve are connected to the third carrier gas pipe 53 , and the other port of the shunt three-way valve is connected to the intake end of the second carrier gas pipe 52 . connected.

Referring to FIG. 1 and FIG. 2 , further, the portable gas chromatography analysis device further includes a carrier gas manifold 58 . One end of the carrier gas main pipe 58 is connected to the carrier gas source, and the other end of the carrier gas main pipe 58 is respectively connected to the first carrier gas pipe 51 and the third carrier gas pipe 53 through the second flow dividing member 59 . Further, the multi-port valve 20 is, for example, a pneumatic multi-port valve 20, and the pneumatic multi-port valve 20 is connected with a control air pipe 59A. When the control air pipe 59A is ventilated, the multi-port valve 20 can be adjusted to the first working state, and the control air pipe 59A can be controlled. When the gas source is disconnected, the multi-way valve 20 returns to the second working state. Of course, the multi-port valve 20 is not limited to using a pneumatic multi-port valve 20, and other types of multi-port valves 20 can also be used, for example, controlled by motor drive, or controlled by manual rotation, and so on.

When the multi-way valve 20 selects the pneumatic multi-way valve 20, in this embodiment, the carrier gas main pipe 58 is also connected to the control gas pipe 59A through the second diverter 59, and the control gas pipe 59A is provided with an electric control valve 59B, which is electrically controlled The valve 59B is used to control whether the control gas pipe 59A communicates with the carrier gas main pipe 58 , so as to control the working state of the multi-port valve 20 .

Specifically, the second diverter 59 is a diverter four-way valve, one of the ports of the diverter four-way valve is connected to the carrier gas source, and the other three ports are respectively connected to the first carrier gas pipe 51 , the third carrier gas pipe 53 , and the control gas pipe 59A is connected.

Referring to FIG. 1 or FIG. 2 again, in one embodiment, the portable gas chromatography analysis device further includes a first two-position three-way valve 81 disposed between the second carrier gas pipe 52 and the seventh interface A7. The first port A1 and the second port A2 of the first two-position three-way valve 81 are set on the first sample injection tube 11 , the third port A3 of the first two-position three-way valve 81 and the gas outlet end of the second carrier gas pipe 52 connected. In this way, the second carrier gas pipe 52 does not need to be directly connected to the seventh port A7, but is connected to the third port A3 of the first two-position three-way valve 81 provided on the first sample injection pipe 11. The two-position three-way valve 81 is connected to the seventh port A7, so that the first two-position three-way valve 81 can control whether the second carrier gas pipe 52 is connected to the seventh port A7, and can also control the sample gas on the first sample injection pipe 11. Enter the seventh interface A7. In this way, when the pre-concentration trapping pipe 61 works in the trapping state, the multi-way valve 20 works in the first working state, controls the third port A3 of the first two-position three-way valve 81 to be cut off, and the first two-position three-way valve 81 The first interface A1 is connected to the second interface A2, so that the sample gas in the first sampling tube 11 can smoothly enter the seventh interface A7, and at the same time, the carrier gas in the second carrier gas tube 52 can be prevented from entering the seventh interface. In A7; when the pre-concentration trap tube 61 works in the thermal desorption state, the multi-port valve 20 works in the second working state, because only the desorbed sample to be tested in the pre-concentration trap tube 61 needs to be sent to the chromatograph In the analysis column 71, the trapping action is no longer required. At this time, by closing the first two-position three-way valve 81, the carrier gas in the second carrier gas pipe 52 is prevented from entering the seventh port A7, and the first inlet is avoided. The sample gas in the sample tube 11 enters the seventh interface A7; when the pre-concentration trap tube 61 works in the backflushing cleaning state, the multi-way valve 20 works in the first working state, and controls the first two-position three-way valve 81 The first port A1 of the first two-position three-way valve 81 is closed, and the second port A2 of the first two-position three-way valve 81 is connected to the third port A3, so that the carrier gas in the second carrier gas pipe 52 can smoothly enter through the first two-position three-way valve 81. To the first interface A1 and the subsequent pre-concentration trap tube 61, the remaining sample to be tested in the pre-concentration trap tube 61 can be taken out. In addition, the sample gas in the first sample injection tube 11 no longer enters into the pre-concentration trap tube 61. In the seventh interface A7.

It can be understood that this embodiment is not limited to using the above-mentioned first two-position three-way valve 81, for example, a three-way pipe can be used to connect the gas outlet end of the second carrier gas pipe 52 to the first sampling pipe 11, The on-off valve provided on the second carrier gas pipe 52 and the on-off valve provided on the first sample injection pipe 11 replace the first two-position three-way valve 81 .

It should be noted that the arrangement of the first interface A1 and the second interface A2 of the first two-position three-way valve 81 on the first injection tube 11 means that the first injection tube 11 is divided into two pipe sections, wherein One pipe section is connected to the first port A1 of the first 2/3-way valve 81 , and the other pipe section is connected to the second port A2 of the first 2/3-way valve 81 .

Please refer to FIG. 3 , which shows a schematic structural diagram of a portable gas chromatographic analysis device according to another embodiment of the present invention. In one embodiment, the portable gas chromatography analysis device further includes a second sampling tube 12 . The second sampling tube 12 communicates with the seventh interface A7. In this way, when the trapping work is performed, the sample gas can be sent into the pre-concentration trapping of the third pipeline 33 through the seventh interface A7 and the sixth interface A6 in turn through the first sampling tube 11, or the sample gas can be The second sampling tube 12 sends the sample gas into the pre-concentration and trapping of the third pipeline 33 through the seventh port A7 and the sixth port A6 in sequence. In actual work, the first sampling tube 11 is mainly responsible for the sampling of the ambient air sample or the external standard sample, and the second sampling tube 12 is mainly responsible for the sampling of the internal standard sample. Of course, only the first sampling tube 11 may be used for sampling, or a larger number of sampling tubes may be adopted, which is not limited herein.

Referring to FIG. 3 , in one embodiment, the portable gas chromatography analysis device further includes a second two-position three-way valve 82 disposed between the second sampling tube 12 and the seventh interface A7. The first port A1 and the second port A2 of the second 2/3-way valve 82 are provided on the first sampling tube 11 , and the third port A3 of the second 2/3-way valve 82 is connected to the gas outlet of the second sampling tube 12 . connected end-to-end. The second two-position three-way valve 82 is similar to the first two-position three-way valve 81 , and the second sampling tube 12 does not need to be directly connected to the seventh interface A7 , but is connected to the first sampling tube 11 . The third port A3 of the 2/2/3-way valve 82 is connected to the seventh port A7 through the second 2/3-way valve 82, so that the second 2/3-way valve 82 can control whether the second sampling tube 12 is connected to The seventh interface A7 is connected, and it can also control whether the sample gas in the first sampling tube 11 enters the seventh interface A7. In this way, when the sample gas of the first sampling tube 11 needs to enter the seventh port A7, the first port A1 of the second two-position three-way valve 82 communicates with the second port A2, and controls the second two-position three-way valve 82 to communicate with the second port A2. The third interface A3 of the through valve 82 is cut off, so that the first sampling tube 11 is communicated with the seventh interface A7, and the second sampling tube 12 is disconnected; when it is necessary to make the sample gas of the second sampling tube 12 enter the seventh interface In A7, the second port A2 that controls the second 2/3-way valve 82 is communicated with the third port A3, and the first port A1 that controls the second 2/3-way valve 82 is closed, so that the second sampling tube 12 Connected with the seventh interface A7, the first sampling tube 11 is disconnected.

Referring to FIG. 3, in one embodiment, the portable gas chromatographic analysis device further includes a quantitative tube 62 arranged in parallel with the pre-concentration trapping tube 61, and is used to control the quantitative tube 62 or the pre-concentration trapping tube 61 to be connected to the third Control assembly for line 33. In this way, for the sample gas that needs to be captured, the control component controls the pre-concentration capture tube 61 to be connected to the third pipeline 33, and the quantitative tube 62 will not be connected to the third pipeline 33 at this time, so that The sample gas that needs to be captured can enter the pre-concentration capture tube 61 to be captured. On the contrary, for the sample gas that does not need to be trapped, such as the sample gas with a high concentration of the sample to be tested, the control component controls the quantitative tube 62 to be connected to the third pipeline 33, and the pre-concentration trap tube 61 is at this time. It will not be connected to the third pipeline 33, and the sample gas that does not need to be captured can be directly entered into the quantitative tube 62 for collection, and will be synchronously brought in by the carrier gas of the third carrier gas tube 53 in the subsequent steps. The separation operation is carried out in the chromatography column 71, and the detection process is carried out in the detector 72. Specifically, the quantitative tube 62 is, for example, a passivation metal tube, and the passivation metal tube has a low adsorption capacity for the sample to be measured in the sample gas. The specific length and inner diameter of the quantitative tube 62 are set according to requirements, which are related to the fixed sample amount, and will not be repeated here.

Referring to FIG. 3 , further, the control assembly includes two third two-position three-way valves 83 respectively located on both sides of the pre-concentration collecting pipe 61 . The first port A1 and the second port A2 of the third 2/3-way valve 83 are arranged on the third pipeline 33 , and one end of the quantitative tube 62 is connected to the third port A3 of one of the third 2/3-way valves 83 The other end of the quantitative tube 62 is communicated with the third port A3 of the other third two-position three-way valve 83 . In this way, by controlling the first port A1 and the second port A2 of the third two-position three-way valve 83 to be connected to the third pipeline 33, and controlling the third port A3 of the third two-position three-way valve 83 to be turned off, it is possible to The pre-concentration capture tube 61 is connected to the third pipeline 33. At this time, both ends of the quantitative tube 62 are closed and are not connected to the third pipeline 33; by controlling the third two-position three-way valve 83 The first port A1 is communicated with the third port A3, and the second port A2 that controls the third two-position three-way valve 83 is closed, so that the quantitative tube 62 can be connected to the third pipeline 33, and the pre-concentration and trapping tube 61 can be realized. Both ends are disconnected and will not be connected to the third pipeline 33 .

It should be noted that the structure of the third two-position three-way valve 83 is similar to that of the first two-position three-way valve 81 , and the third two-position three-way valve 83 is connected to the third pipeline 33 in a similar manner, which will not be described in detail.

Please refer to FIG. 4 , which is a schematic structural diagram of a portable gas chromatographic analysis device according to another embodiment of the present invention. In one embodiment, the portable gas chromatography analysis device further includes a liquid sampling module 90 , a fourth 2/3-way valve 84 , a fifth 2/3-way valve 85 , a fourth carrier gas pipe 54 and a fourth pipeline 38 . The first port A1 and the second port A2 of the fourth 2/3-way valve 84 are provided on the first carrier gas pipe 51 , the third port A3 of the fourth 2/3-way valve 84 and the intake end of the fourth carrier gas pipe 54 The gas outlet end of the fourth carrier gas pipe 54 is communicated with the carrier gas inlet of the liquid sampling module 90 . The first port A1 and the second port A2 of the fifth 2/3-way valve 85 are provided on the first pipeline 31 , and the third port A3 of the fifth 2/3-way valve 85 is connected to the sample outlet 94 of the liquid sampling module 90 . connected. In this way, under the action of the fourth two-position three-way valve 84 and the fifth two-position three-way valve 85 , the relevant detection work for the liquid sample and the relevant detection work for the gas sample can be carried out independently. Specifically, the connection pipe between the third interface A3 of the fifth two-position three-way valve 85 and the sample outlet 94 of the liquid sampling module 90 is an inertized metal pipe or a hollow quartz capillary, which is not limited here. . In addition, a thermal insulation layer or a heating structure may also be provided on the connecting pipe between the third interface A3 of the fifth two-position three-way valve 85 and the sample outlet 94 of the liquid sampling module 90 .

Referring to FIG. 4 , specifically, when the liquid sample needs to be detected, by controlling the fourth two-position three-way valve 84 and the fifth two-position three-way valve 85 , the fourth two-position three-way valve 84 and the fifth two-position three-way valve 84 and the fifth two-position three-way valve 84 are controlled. The three-way valve 85 is in one of the working states, that is, the first port A1 and the third port A3 of the fourth two-position three-way valve 84 are connected to each other, and the second port A2 of the fourth two-position three-way valve 84 is closed, so that the realization of The carrier gas in the first carrier gas pipe 51 enters the fourth carrier gas pipe 54 and the liquid sampling module 90, while the carrier gas in the first carrier gas pipe 51 cannot enter the third interface A3. The first interface A1 and the third interface A3 of the through valve 85 are connected to each other, and the second interface A2 of the fifth two-position three-way valve 85 is closed, so that the carrier gas and the liquid sample in the liquid sampling module 90 can pass through the fourth pipeline. 38 enters the first pipeline 31 and continues to flow to the guard column 34 and the chromatographic analysis column 71 , where the chromatographic analysis column 71 performs chromatographic separation, and passes through the detector 72 for related detection processing.

When the liquid sample does not need to be detected, by controlling the fourth two-position three-way valve 84 and the fifth two-position three-way valve 85, the fourth two-position three-way valve 84 and the fifth two-position three-way valve 85 are in another position. A working state, that is, the first port A1 and the second port A2 of the fourth two-position three-way valve 84 are connected to each other, the third port A3 of the fourth two-position three-way valve 84 is closed, and the carrier gas in the first carrier gas pipe 51 is closed. The gas cannot enter the fourth carrier gas pipe 54. In addition, the first port A1 and the second port A2 of the fifth two-position three-way valve 85 are connected to each other, the third port A3 of the fifth two-position three-way valve 85 is closed, and the third port A3 of the fifth two-position three-way valve 85 is closed. The carrier gas and liquid samples of the four pipelines 38 will not enter the first pipeline 31 through the fifth two-position three-way valve 85, so the liquid sampling module 90 is not connected to the chromatographic analysis column 71 and the detector 72, At this point, the gas sample detection work can be carried out independently.

Referring to FIG. 4 , further, the liquid sampling module 90 includes a body 91 provided with a chamber. The body 91 is provided with a liquid sampling end 92 communicating with the chamber, a carrier gas inlet 93 , a sample outlet 94 , and a septum purge. Pipeline 95 and shunt pipeline 96 . The body 91 is also provided with a heating mechanism, and the heating mechanism heats the body 91, and the heating temperature is specifically controlled at 200°C to 300°C, so that the temperature of the liquid sample entering the chamber from the liquid sampling end 92 increases and vaporizes, The vaporized liquid sample is discharged from the sample outlet 94 together with the carrier gas entering from the carrier gas inlet 93 and enters the first pipeline 31 . Among them, the septum purging pipeline 95 can discharge the dirt generated in the chamber to the outside, and the shunt pipeline 96 can reduce the flow rate of the sample, so that the sample in the preset flow range can enter the first pipeline 31 .

Referring to FIG. 1 again, in one embodiment, a portable gas chromatographic analysis method adopts the portable gas chromatographic analysis device of any of the above-mentioned embodiments, including the following steps:

Step S10, first make the multi-port valve 20 run in the first working state, control the air pump 43 to work, and the air pump 43 makes the sample gas flow through the first sampling tube 11, the seventh interface A7, the sixth interface A6, and the third pipeline in sequence. 33. The ninth port A9, the eighth port A8 and the suction pipe 42, when the sample gas flows through the third pipeline 33, the pre-concentration trap tube 61 on the third pipeline 33 captures and collects the sample gas to be detected. sample, so that the sample to be tested is concentrated in the pre-concentration trap tube 61, and other gases are pumped out by the air pump 43 through the suction tube 42;

Wherein, in step S10, the carrier gas in the third carrier gas pipe 53 can pass through the tenth port A10, the first port A1, the first pipeline 31, the fifth port A5, the fourth port A4 and the discharge pipe 41 to the outside in sequence After discharging, the carrier gas in the first carrier gas pipe 51 can be discharged into the detector 72 through the third port A3, the second port A2 and the second pipeline 32 in sequence, so that the carrier gas source can not be shut down.

Step S20, after the pre-concentration capture tube 61 captures a preset amount of the sample to be tested, the air pump 43 stops working;

In step S30, after the air pump 43 stops working, the multi-way valve 20 is operated in the second working state, and the pre-concentration trap tube 61 is heated and desorbed by the thermal desorption element, so that the pre-concentration trap tube 61 is heated and desorbed. The sample is vaporized, and the carrier gas introduced by the third carrier gas pipe 53 flows through the tenth interface A10, the ninth interface A9, the third pipeline 33, the sixth interface A6, the fifth interface A5, and the first pipeline 31 in sequence. , the first interface A1, the second interface A2 and the second pipeline 32, when the carrier gas introduced by the third carrier gas pipe 53 enters the pre-concentration trapping pipe 61, it carries the vaporized sample to be tested and enters the second pipeline together 32, enter the chromatographic analysis column 71 from the second pipeline 32;

In step S40 , the chromatographic analysis column 71 performs a heating operation so that the vaporized sample to be tested is subjected to chromatographic separation, and the detector 72 sequentially performs detection processing on the separated target substances.

The above-mentioned portable gas chromatographic analysis method does not need to enter the liquid sampling module 90, but the sample to be tested heated and desorbed in the pre-concentration trap tube 61 is brought into the chromatographic analysis column 71 by the introduced carrier gas. For subsequent detection actions, that is, it is not necessary to heat the gas to 250° C., and it is also unnecessary to control the liquid sampling module 90 , which can save energy and make the control relatively simple.

Please refer to FIG. 1 and FIG. 2 again, further, after the detection processing step is finished, a backflushing cleaning step is also included:

The multi-port valve 20 is operated in the first working state, the carrier gas introduced into the first carrier gas pipe 51 flows through the third port A3 and the second port A2 into the second pipeline 32 in turn, and the remaining gas in the chromatographic analysis column 71 is removed. The sample to be tested continues to be pushed forward into the detector 72 for detection; the carrier gas introduced by the second carrier gas pipe 52 flows through the seventh port A7, the sixth port A6, the third pipeline 33, the ninth port A9, The eighth port A8 and the suction pipe 42 make the sample to be tested in the pre-concentration trap pipe 61 discharged to the outside; the carrier gas in the third carrier gas pipe 53 flows through the tenth port A10, the first port A1, the first The pipeline 31 , the fifth port A5 , the fourth port A4 and the discharge pipe 41 are discharged to the outside.

It can be seen that the chromatographic analysis column 71 can ensure a better detection effect of the sample to be tested. While the chromatographic analysis column 71 is working, the pre-concentration trapping pipe 61 and its connecting pipe can be backflushed and cleaned, and the backflushing process and analysis can be performed. The synchronization of the process can shorten the analysis cycle and improve the work efficiency.

Please refer to FIG. 1 and FIG. 2 again. In one embodiment, in step S30, after the air pump 43 stops working and before the carrier gas introduced into the third carrier gas pipe 53 enters the preset concentration and trapping pipe, a pre-concentration and trapping pipe is further included. In the thermal desorption step, the pre-concentration trap tube 61 is heated and heated for a preset time. In this way, it can be achieved that the sample to be tested in the pre-concentration trapping tube 61 is sufficiently desorbed by heat, and the desorption effect is better.

The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features It is considered to be the range described in this specification.

The above examples only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Claims (13)

1. A portable gas chromatographic analysis device, characterized in that the portable gas chromatographic analysis device comprises:

   a first sampling tube, the inlet end of the first sampling tube is used for introducing sample gas;

   A multi-way valve, a first pipeline, a second pipeline, a first carrier gas pipe, a discharge pipe, a third pipeline, a second carrier gas pipe, a suction pipe and a third carrier gas pipe, the multi-way valve is provided with a first port, second port, third port, fourth port, fifth port, sixth port, seventh port, eighth port, ninth port and tenth port, the first port passes through the first pipeline It is communicated with the fifth port, the second port is communicated with the inlet end of the second pipeline, the third port is communicated with the outlet end of the first carrier gas pipe, and the fourth port is communicated with the air inlet end of the second pipeline. The interface is connected with the intake end of the discharge pipe, the gas outlet end of the discharge pipe is the gas discharge end, the sixth interface is communicated with the ninth interface through the third pipeline, the seventh interface The interfaces are respectively communicated with the gas outlet end of the first sampling tube and the gas outlet end of the second carrier gas tube, the eighth interface is communicated with the suction tube, and the tenth interface is also communicated with the first The gas outlet ends of the three carrier gas pipes are connected, and the gas inlet end of the first carrier gas pipe, the gas inlet end of the second carrier gas pipe and the gas inlet end of the third carrier gas pipe are all used for introducing carrier gas;

   Pre-concentration trap tube, thermal desorption part, air pump, chromatographic analysis column and detector, the pre-concentration trap tube is arranged on the third pipeline, and the thermal desorption part is used for the pre-concentration trap tube. The header is heated and desorbed, the air pump is arranged on the suction pipe, the chromatographic analysis column is arranged on the second pipeline, and the gas outlet end of the second pipeline is connected to the inlet of the detector Pass;

   The multi-port valve operates in the first working state and the second working state. When the multi-port valve operates in the first working state, the first port and the tenth port are connected through a pipeline, and the first port is connected to the tenth port. The second interface is communicated with the third interface through a pipeline, the fourth interface is communicated with the fifth interface through a pipeline, the sixth interface is communicated with the seventh interface through a pipeline, and the eighth interface is communicated through a pipeline. It is communicated with the ninth port through a pipeline; when the multi-way valve operates in the second working state, the first port is communicated with the second port through a pipeline, and the third port is connected with the first port. The four ports are communicated through pipes, the fifth port is communicated with the sixth port through pipes, the seventh port is communicated with the eighth port through pipes, and the ninth port is communicated with the tenth port connected by pipes.
2. The portable gas chromatography analysis device according to claim 1, wherein the portable gas chromatography analysis device further comprises a guard column arranged on the first pipeline.
3. The portable gas chromatography analysis device according to claim 2, wherein the guard column is an inertized metal hollow capillary tube or a hollow quartz capillary tube; the guard column is detachably arranged on the first pipeline ; A heating element and/or a temperature measuring element are arranged on the guard column.
4. The portable gas chromatographic analysis device according to claim 1, wherein the portable gas chromatographic analysis device further comprises a first pressure controller arranged on the first carrier gas pipe, and a first pressure controller arranged on the third carrier gas The second pressure controller on the gas pipe; the third carrier gas pipe is provided with a first shunt piece, and the first flow shunt piece is connected with the air inlet end of the second carrier gas pipe.
5. The portable gas chromatography analysis device according to claim 1, wherein the portable gas chromatography analysis device further comprises a first two-position three-way valve disposed between the second carrier gas pipe and the seventh interface ; The first interface and the second interface of the first two-position three-way valve are arranged on the first sampling pipe, and the third interface of the first two-position three-way valve is connected to the second carrier gas pipe. The outlet end is connected.
6. The portable gas chromatographic analysis device according to claim 1, characterized in that, the portable gas chromatographic analysis device further comprises a second injection pipe, and the second injection pipe communicates with the seventh interface.
7. The portable gas chromatographic analysis device according to claim 6, wherein the portable gas chromatographic analysis device further comprises a second two-position three-way connection disposed between the second sampling tube and the seventh interface valve; the first interface and the second interface of the second 2/3-way valve are arranged on the first injection pipe, and the third interface of the second 2/3-way valve is connected to the second injection pipe The outlet end of the pipe is connected.
8. The portable gas chromatographic analysis device according to claim 1, characterized in that, the portable gas chromatographic analysis device further comprises a quantitative tube arranged in parallel with the pre-concentration trapping tube, and a quantitative tube for controlling the quantitative tube or the The pre-concentration capture pipe is connected to the control assembly of the third pipeline.
9. The portable gas chromatographic analysis device according to claim 8, wherein the control assembly comprises two third two-position three-way valves respectively located on both sides of the pre-concentration trapping pipe; the third two-position three-way valve; The first port and the second port of the three-way valve are arranged on the third pipeline, and one end of the quantitative tube is communicated with the third port of one of the third two-position three-way valves. The other end is communicated with the third port of the other third two-position three-way valve.
10. The portable gas chromatographic analysis device according to claim 1, wherein the portable gas chromatographic analysis device further comprises a liquid sampling module, a fourth two-position three-way valve, a fifth two-position three-way valve, a fourth carrier The gas pipe and the fourth pipeline, the first interface and the second interface of the fourth two-position three-way valve are arranged on the first carrier gas pipe, and the third interface of the fourth two-position three-way valve is connected to the The inlet end of the fourth carrier gas pipe is connected, and the gas outlet end of the fourth carrier gas pipe is communicated with the carrier gas inlet of the liquid sampling module; the first interface and the second interface of the fifth two-position three-way valve are connected Set on the first pipeline, the third interface of the fifth two-position three-way valve is communicated with the carrier gas outlet of the liquid sampling module.
11. A portable gas chromatographic analysis method, characterized in that, the portable gas chromatographic analysis device according to any one of claims 1 to 10 is adopted, comprising the steps of:

    Step S10, first make the multi-port valve run in the first working state, control the air pump to work, and the air pump makes the sample gas flow through the first sampling tube, the seventh interface, the sixth interface, the third pipeline, the ninth interface, and the first sample gas. Eight ports and suction pipe, when the sample gas flows through the third pipeline, the pre-concentration trap tube on the third pipeline captures and collects the sample to be tested in the sample gas, so that the sample to be tested is concentrated in the pre-concentration trap tube , and other gases are pumped out by the air pump through the suction pipe;

    Step S20, after the pre-concentration trap tube captures a preset amount of the sample to be tested, the air pump stops working;

    Step S30, after the air pump stops working, make the multi-way valve run in the second working state, and perform heating and desorption treatment on the pre-concentration trapping tube through the thermal desorption element, so that the sample to be tested in the pre-concentration trapping tube is vaporized and desorbed. The carrier gas introduced by the third carrier gas pipe flows through the tenth interface, the ninth interface, the third pipeline, the sixth interface, the fifth interface, the first pipeline, the first interface, the second interface and the second pipe. When the carrier gas introduced by the third carrier gas pipe enters the pre-concentration trapping pipe, it carries the vaporized sample to be tested into the second pipeline, and then enters the chromatographic analysis column from the second pipeline;

    In step S40 , the chromatographic analysis column performs a heating operation, so that the vaporized sample to be tested is chromatographically separated, and the detector sequentially performs detection processing on the separated target substances.
12. The portable gas chromatographic analysis method according to claim 11, characterized in that, after the detection and processing step is finished, it further comprises a backflushing cleaning step:

    Make the multi-port valve run in the first working state, the carrier gas introduced by the first carrier gas pipe flows through the third interface and the second interface into the second pipeline in turn, and the remaining sample to be tested in the chromatographic analysis column continues to move forward Push it into the detector for detection; the carrier gas introduced by the second carrier gas pipe flows through the seventh interface, the sixth interface, the third pipeline, the ninth interface, the eighth interface and the suction pipe in sequence, so that the pre-concentration trapping is carried out. The sample to be tested in the header is discharged to the outside; the carrier gas in the third carrier gas pipe flows through the tenth interface, the first interface, the first pipeline, the fifth interface, the fourth interface and the discharge pipe to be discharged to the outside.
13. The portable gas chromatographic analysis method according to claim 11, wherein in step S30, after the air pump stops working and before the carrier gas introduced into the third carrier gas pipe enters the preset concentration and trapping pipe, it further comprises a pre-processing method. In the thermal desorption step, the pre-concentration trap tube is heated and heated for a preset time.

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