A condensation and pre-concentration device for trace organic gases

Abstract

This application provides a condensation and pre-concentration device for trace organic gases, comprising: a first valve assembly and a second valve assembly. The first valve assembly has a first port connected to the sixth port of the second valve assembly, a first trap disposed between its second port and its fifth port, a third port connected to an vent port, a fourth port connected to an external sample gas port via a first dryer, and a sixth port connected to a carrier gas port via a first electrically controlled valve. The second valve assembly has a first port vented, a second trap disposed between its second port and its fifth port (the second trap is isolated when the second valve assembly is in the isolation position), a third port connected to the carrier gas port via a second electrically controlled valve, and a fourth port connected to a chromatographic column. A main controller is connected to the first valve assembly, the second valve assembly, the first trap, the second trap, the first electrically controlled valve, and the second electrically controlled valve. This device features miniaturization and portability.

Description

Technical Field

[0001] This application relates to the field of volatile gas collection and analysis technology, specifically to a condensation and pre-concentration device for trace organic gases. Background Technology

[0002] Trace organic gases refer to organic gaseous substances present in extremely low concentrations in the air, requiring highly sensitive detection equipment. For example, the condensation and pre-concentration equipment and method for trace organic gases disclosed in existing patent document CN 119926096 A includes a water vapor removal device, a carbon dioxide removal device, a trap device, a temperature control device, a valve assembly, a carrier gas input device, and an analysis device. (This is in conjunction with its appendix.) Figure 1 As shown, the valve assembly includes six valve components. These valve components occupy a large space, resulting in an excessively large overall size of the equipment. This also causes considerable inconvenience in the design of pipeline connections and fails to meet the current demand for miniaturized and intelligent equipment. Utility Model Content

[0003] The technical problem to be solved by this application is that the existing trace organic gas detection schemes are too large and have difficult pipeline design, so this application provides a condensation and pre-concentration device for trace organic gases.

[0004] This application provides a condensation and pre-concentration device for trace organic gases, comprising:

[0005] A first valve assembly and a second valve assembly, both including six ports, and the second valve assembly including an isolation position, wherein when the second valve assembly is in the isolation position, its second and fifth ports are isolated, wherein:

[0006] The first valve assembly has its first port connected to the sixth port of the second valve assembly, a first trap is provided between its second port and its fifth port, its third port is connected to the vent port, its fourth port is connected to the external sample gas port after passing through the first dryer, and its sixth port is connected to the carrier gas port through the first electrically controlled valve.

[0007] The second valve assembly has a first port that is emptied, a second trap that is disposed between its second port and its fifth port, and the second trap that is isolated when the second valve assembly is in the isolation position. Its third port is connected to the carrier gas port via a second electrically controlled valve, and its fourth port is connected to the chromatographic column.

[0008] The main controller is connected to the first valve assembly, the second valve assembly, the first trap, the second trap, the first solenoid valve, and the second solenoid valve.

[0009] Preferably, in the trace organic gas condensation pre-concentration device, the first valve assembly includes an isolation position, and the first trap is isolated when the first valve assembly is in the isolation position.

[0010] Preferably, the trace organic gas condensation and pre-concentration equipment further includes:

[0011] A flow controller is disposed between the third port of the first valve assembly and the vent port;

[0012] The flow controller is connected to the main controller.

[0013] Preferably, the trace organic gas condensation and pre-concentration equipment further includes:

[0014] A first pressure sensor is disposed between the third port of the first valve assembly and the flow controller, and the first pressure sensor is connected to the main controller.

[0015] Preferably, the trace organic gas condensation and pre-concentration equipment further includes:

[0016] The second dryer is located between the fifth port of the first valve assembly and the first trap.

[0017] Preferably, the trace organic gas condensation and pre-concentration equipment further includes:

[0018] A trap flow meter is disposed at the first port of the second valve assembly;

[0019] A second pressure sensor is disposed between the first port of the second valve assembly and the trap flow meter;

[0020] The second pressure sensor is connected to the main controller.

[0021] Preferably, the trace organic gas condensation and pre-concentration device further includes a third valve assembly, which is disposed between the first valve assembly and the second valve assembly, wherein:

[0022] The third valve assembly includes ten ports. Its first port is connected to the fourth port of the second valve assembly, its second port is connected to the chromatographic column, an additional chromatographic column is disposed between its third port and the tenth port, its fourth port is connected to the carrier gas port after passing through the third electronically controlled valve, its fifth port is connected to the column backflush device, a carbon dioxide filter is disposed between its sixth port and the ninth port, its seventh port is connected to the first port of the first valve assembly, and its eighth port is connected to the sixth port of the second valve assembly.

[0023] The controlled end of the third valve assembly is connected to the main controller.

[0024] Preferably, the trace organic gas condensation and pre-concentration equipment further includes:

[0025] A third pressure sensor is located at the carrier gas port;

[0026] A fourth pressure sensor is located between the external sample gas inlet port and the first dryer;

[0027] Both the third pressure sensor and the fourth pressure sensor are connected to the main controller.

[0028] Preferably, the trace organic gas condensation and pre-concentration equipment further includes:

[0029] A filter is disposed between the first pressure sensor and the flow controller.

[0030] Preferably, the trace organic gas condensation and pre-concentration equipment further includes:

[0031] The drying gas branch includes a drying gas port and a fifth pressure sensor, a drying gas solenoid valve, a drying gas regulating valve, a third dryer, and a drying gas flow meter connected in sequence;

[0032] The fifth pressure sensor, the drying gas solenoid valve, the drying gas regulating valve, the third dryer, and the drying gas flow meter are connected to the main controller.

[0033] The technical solution provided in this application has the following technical effects compared with the prior art:

[0034] The technical solution provided in this application only requires the cooperation of two components to achieve the sampling, purification, analysis, and injection of trace organic gases, and to obtain the separation results of the target substance. Compared with the prior art, it reduces multiple valve components, thereby simplifying the piping design of the entire equipment and reducing the overall size of the equipment, making the trace organic gas condensation and pre-concentration equipment more in line with the current user demand for miniaturization of trace organic gas condensation and pre-concentration equipment. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a trace organic gas condensation and pre-concentration device according to one embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the structure of a trace organic gas condensation and pre-concentration device according to another embodiment of this application;

[0037] Figure 3 A state diagram of the condensation and pre-concentration device for trace organic gases according to an embodiment of this application during the sampling step;

[0038] Figure 4a This is a state diagram of a trace organic gas condensation and pre-concentration apparatus according to an embodiment of this application, when performing a purification step, including two valve assemblies;

[0039] Figure 4b This is a state diagram of a trace organic gas condensation and pre-concentration apparatus according to an embodiment of this application, when performing a purification step, including three valve assemblies;

[0040] Figure 5a This is a state diagram of a trace organic gas condensation and pre-concentration apparatus according to an embodiment of this application, when performing a transfer step, including two valve assemblies;

[0041] Figure 5b This is a state diagram of a trace organic gas condensation and pre-concentration apparatus according to an embodiment of this application, when performing a transfer step, including three valve assemblies;

[0042] Figure 6 A state diagram of the condensation and pre-concentration apparatus for trace organic gases according to an embodiment of this application, during which carbon dioxide is removed while performing a transfer step;

[0043] Figure 7 A state diagram of the isolation of the second trap for the analysis step in the condensation and pre-concentration device for trace organic gases according to one embodiment of this application;

[0044] Figure 8a This is a state diagram of the condensation and pre-concentration apparatus for trace organic gases according to an embodiment of this application, when performing the injection step with two valve assemblies;

[0045] Figure 8b This is a state diagram of the condensation and pre-concentration apparatus for trace organic gases according to an embodiment of this application, when performing the injection step, including three valve assemblies;

[0046] Figure 9 This is a state diagram of two column separations during another injection step in the condensation and pre-concentration device for trace organic gases described in one embodiment of this application.

[0047] Figure 10 This is a schematic diagram of the structure of the drying gas branch according to one embodiment of this application. Detailed Implementation

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] This embodiment provides a condensation and pre-concentration device for trace organic gases, such as... Figure 1 As shown, it includes:

[0050] A first valve assembly V1 and a second valve assembly V2, both comprising six ports, with the second valve assembly V2 including an isolation position. When the second valve assembly V2 is in the isolation position, its second and fifth ports are isolated.

[0051] The first valve assembly V1 has its first port connected to the sixth port of the second valve assembly V2, a first trap B1 is provided between its second port and its fifth port, its third port is connected to the vent port P, its fourth port is connected to the external sample gas port YQ after passing through the first dryer G1, and its sixth port is connected to the carrier gas port GQ through the first electrically controlled valve EPC1.

[0052] The second valve assembly V2 has a first port emptied, and a second trap B2 is disposed between its second port and its fifth port. When the second valve assembly V2 is in the isolation position, the second trap B2 is isolated. The third port of the second valve assembly V2 is connected to the carrier gas port GQ via the second electronically controlled valve EPC2, and its fourth port is connected to the chromatographic column SP. In addition, as shown in the figure, as an feasible solution, the first port of the second valve assembly V2 can also be connected to a trap flow meter BS to realize trap flow monitoring.

[0053] The main controller (not shown in the figure) is connected to the first valve assembly V1, the second valve assembly V2, the first trap B1, the second trap B2, the first solenoid valve EPC1, and the second solenoid valve EPC2.

[0054] The main controller can send control commands to various valves and traps under the control of the operator, thereby controlling the operation of each valve and trap. Therefore, it is only necessary for the main controller to be able to communicate with each component unit that needs to be controlled. The main controller can be a PLC controller inside the equipment or a computer with control software, and is equipped with an operation panel.

[0055] The temperatures of the first trap B1 and the second trap B2 are adjustable, enabling vaporization and liquefaction of the substances inside. The temperatures of the first trap B1 and the second trap B2 can be controlled by adjusting the critical temperature required for the vaporization or liquefaction of the substances. For example, if the first trap B1 needs to liquefy water vapor, its temperature can be controlled within the range of -50 to -70°C. The method of temperature control for the traps is similar to that in the prior art patents cited in the background section (this solution was actually proposed by the inventor in this case), and the temperature setting and control of the traps will not be elaborated further in this application. Because the inventor found the solutions in the prior art patents to be overly complex, difficult to miniaturize, and even more difficult to use as mobile devices, the improvement in this application lies in simplifying the equipment, designing more reasonable pipe connections, reducing valve components, and reducing the size of the equipment, making it convenient to use as a mobile device.

[0056] like Figure 1 As shown, compared to the existing technology that requires six valve assemblies, the solution in this application only requires the cooperation of two valve assemblies to achieve the sampling, purification, analysis, and injection of trace organic gases, and obtain the separation results of the target substance. Compared with the prior art, reducing multiple valve assemblies simplifies the piping design of the entire device and reduces the overall size of the device, making the trace organic gas condensation and pre-concentration equipment more in line with the current user demand for miniaturization of trace organic gas condensation and pre-concentration equipment.

[0057] Alternatively, the first valve assembly V1 can also be the same as the second valve assembly V2, having an isolation position. When the first valve assembly V1 is in the isolation position, the second port and the fifth port of the first valve assembly V1 are isolated, and the first trap B1 is in an isolated state.

[0058] like Figure 1 As shown, the trace organic gas condensation and pre-concentration device in this application further includes a flow controller L1, which is disposed between the third port of the first valve assembly V1 and the exhaust port P; the flow controller L1 is connected to the main controller. That is, the flow controller L1 can control the exhaust flow of the exhaust port P, and can both send the flow to the main controller and adjust it according to the main controller.

[0059] Furthermore, such as Figure 2 As shown, the trace organic gas condensation and pre-concentration equipment further includes:

[0060] A third valve assembly V3 is disposed between the first valve assembly V1 and the second valve assembly V2. The third valve assembly V3 includes ten ports: its first port is connected to the fourth port of the second valve assembly V2; its second port is connected to the chromatographic column SP; an additional chromatographic column FSP is disposed between its third and tenth ports; its fourth port is connected to the carrier gas port GQ via a third electrically controlled valve EPC3; its fifth port is connected to the column backflush unit ZFC; a carbon dioxide filter Gc is disposed between its sixth and ninth ports; its seventh port is connected to the first port of the first valve assembly V1; and its eighth port is connected to the sixth port of the second valve assembly V2. The controlled end of the third valve assembly V3 is connected to the main controller. By controlling the positions of the three valve assemblies and the opening and closing of the control valves connected to different ports of the three valve assemblies, different gas pathways can be achieved.

[0061] The third valve assembly V3 is designed to accommodate additional chromatographic columns (FSP), carbon dioxide filters (Gc), and column backflush units (ZFC). If these components need to be connected to the gas line, the third valve assembly V3 can be activated to connect them. If these components do not need to be connected to the gas line, the third valve assembly V3 can simply be activated to provide connectivity.

[0062] like Figure 2 As shown, the trace organic gas condensation and pre-concentration device further includes a first pressure sensor PI1, which is disposed between the third port of the first valve assembly V1 and the flow controller L1, and the first pressure sensor PI1 is connected to the main controller.

[0063] The second dryer G2 is located between the fifth port of the first valve group V1 and the first trap B1.

[0064] The second pressure sensor PI2 is located between the first port of the second valve assembly V2 and the trap flow meter BS; the second pressure sensor PI2 is connected to the main controller.

[0065] The third pressure sensor PI3 is located at the carrier gas port GQ and is connected to the main controller.

[0066] The fourth pressure sensor PI4 is located between the external sample gas inlet port YQ and the first dryer G1.

[0067] A filter GL is positioned between the first pressure sensor PI1 and the flow controller L1. An air pump can also be installed at the vent port P to assist in improving venting efficiency.

[0068] In the above scheme, trace organic gas collection and chromatographic detection can be achieved by controlling the position and state of different valve components, which can effectively reduce the size of the equipment and facilitate its miniaturization and mobility.

[0069] The working process of the above-mentioned equipment includes "

[0070] Sampling steps

[0071] like Figure 3 As shown, the gas flow is indicated by the blue pipe. The second port of the first valve assembly V1 is connected to its third port, and its fourth port is connected to its fifth port. The sample gas passes through the first dryer G1, the fourth port of the first valve assembly V1, the fifth port of the first valve assembly V1, and the second dryer G2 before entering the first trap B1. The temperature of the first trap B1 decreases, liquefying the target substance in the sample gas to obtain the processed gas. The processed gas is then discharged through the second port and the third port of the first valve assembly V1. In the sampling step, only the first valve assembly V1 is needed. Whether the device includes two or three valve assemblies does not affect the gas passage in this step.

[0072] (2) Impurity removal step

[0073] like Figure 4a As shown, the gas flow is indicated by the blue pipeline. In this configuration, the device includes two valve assemblies. The first port of the first valve assembly V1 is connected to its second port, and its fifth port is connected to its sixth port; the first port of the second valve assembly V2 is connected to its sixth port; the first electrically controlled valve EPC1 is open; the carrier gas passes through the first electrically controlled valve EPC1, the sixth port of the first valve assembly V1, the fifth port of the first valve assembly V1, and the second dryer G2 before entering the first trap B1. After the first trap B1 is heated, impurities are converted into gaseous state and discharged with the carrier gas. After passing through the first trap B1, the gas flows through the second port of the first valve assembly V1, the first port of the first valve assembly V1, the sixth port of the second valve assembly V2, and the first port of the second valve assembly V2 before being discharged through the trap flow meter BS. As mentioned earlier, the trap flow meter BS can be installed or not. When the trap flow meter BS is not installed in the device, the gas is discharged after passing through the first port of the second valve assembly V2. It is understood that the following embodiments of this application are illustrated by setting a trap flow meter BS as an example, and are not intended to limit the solution itself.

[0074] like Figure 4bAs shown, the gas flow direction is indicated by the blue pipeline. In this configuration, the device includes three valve assemblies. The first port of the first valve assembly V1 is connected to its second port, and its fifth port is connected to its sixth port; the first port of the second valve assembly V2 is connected to its sixth port; the seventh port of the third valve assembly V3 is connected to its eighth port. At this time, the third valve assembly V3 is directly connected and will not affect the gas flow direction. The first solenoid valve EPC1 is open. After the carrier gas is output from the carrier gas port GQ, it passes through the first solenoid valve EPC1, the sixth port of the first valve assembly V1, the fifth port of the first valve assembly V1, and the second dryer G2 before entering the first trap B1. After the first trap B1 is heated, the impurities are converted into gaseous state and discharged with the carrier gas. After passing through the first trap B1, it passes through the second port of the first valve assembly V1, the first port of the first valve assembly V1, the seventh port of the third valve assembly V3, the eighth port of the third valve assembly V3, the sixth port of the second valve assembly V2, and the first port of the second valve assembly V2 before being discharged through the trap flow meter BS.

[0075] (3) Transfer steps

[0076] like Figure 5a As shown, the first type of gas transfer flow is indicated by the blue pipe, and in this case, the device includes two valve assemblies.

[0077] If the heating of the first trap B1 in the impurity removal step does not reach the boiling point of carbon dioxide or the transfer step is not performed for the first time, the carrier gas enters the first trap B1 after passing through the first electronically controlled valve EPC1, the sixth port of the first valve assembly V1, the fifth port of the first valve assembly V1, and the second dryer G2. After the first trap B1 is heated, the target substance is converted into a gaseous state and discharged from the first trap B1 with the carrier gas. After passing through the second port of the first valve assembly V1, the first port of the first valve assembly V1, the seventh port of the third valve assembly V3, the eighth port of the third valve assembly V3, the sixth port of the second valve assembly V2, and the fifth port of the second valve assembly V2, the target substance is transferred to the second trap B2. After the second trap B2 is cooled to liquefy the target substance, the remaining gas is discharged from the second trap B2 after passing through the second port of the second valve assembly V2, the first port of the second valve assembly V2, and the trap flow meter BS. Since the temperature of the first trap B1 in the impurity removal step does not reach the boiling point of carbon dioxide, the transferred gas does not contain carbon dioxide, and therefore there is no need to connect it to the carbon dioxide filter Gc. If the transfer step is not being performed for the first time, then the carbon dioxide has already been filtered in the previous transfer step, and the gas being transferred this time does not contain carbon dioxide, so there is no need to connect it to the carbon dioxide filter Gc.

[0078] like Figure 5bAs shown, the transfer gas flow is indicated by the blue pipeline. In this case, the device includes three valve assemblies. The state of the first valve assembly V1 is the same as in the impurity removal step. The first port of the second valve assembly V2 is connected to its second port, and its fifth port is connected to its sixth port. The carrier gas enters the first trap B1 after passing through the first solenoid valve EPC1, the sixth port of the first valve assembly V1, the fifth port of the first valve assembly V1, and the second dryer G2. After the first trap B1 is heated, the target substance is converted into a gaseous state and discharged with the carrier gas. After passing through the second port of the first valve assembly V1, the first port of the first valve assembly V1, the seventh port of the third valve assembly V3, the eighth port of the third valve assembly V3, the sixth port of the second valve assembly V2, and the fifth port of the second valve assembly V2, it enters the second trap B2. After the second trap B2 is cooled to liquefy the target substance, the remaining gas is discharged from the second trap B2. After passing through the second port of the second valve assembly V2, the first port of the second valve assembly V2, and the trap flow meter BS, it is discharged. During this process, the third valve assembly V3 does not actually change the gas path and is not filtered by the carbon dioxide filter Gc.

[0079] If, in the impurity removal step, the first trap B1 is heated to above the boiling point of carbon dioxide and the transfer step is being performed for the first time, then in the transfer step, if... Figure 6 As shown, the second type of transfer gas flow direction is indicated by the blue pipeline. During this process, the sixth port of the third valve assembly V3 is connected to its seventh port, and its eighth port is connected to its ninth port. Then, the carrier gas enters the first trap B1 after passing through the first solenoid valve EPC1, the sixth port of the first valve assembly V1, the fifth port of the first valve assembly V1, and the second dryer G2. After the first trap B1 is heated, the target substance is converted into a gaseous state and discharged with the carrier gas. After passing through the second port of the first valve assembly V1, the first port of the first valve assembly V1, the seventh port of the third valve assembly V3, and the sixth port of the third valve assembly V3, the target gas enters the carbon dioxide filter Gc to filter carbon dioxide. After passing through the sixth port of the second valve assembly V2 and the fifth port of the second valve assembly V2, the target gas enters the second trap B2. After the second trap B2 is cooled to liquefy the target substance, the remaining gas is discharged from the second trap B2. After passing through the second port of the second valve assembly V2, the first port of the second valve assembly V2, and the trap flow meter BS, the target gas is discharged. Because the first trap B1 is heated to above the boiling point of carbon dioxide in the impurity removal step, and the transfer step is being performed for the first time, the transferred gas contains carbon dioxide. Therefore, carbon dioxide filtration is performed in this step.

[0080] As mentioned above, the first valve assembly V1 can also have an isolation position. In the transfer step, the first trap B1 can be isolated and heated by adjusting the first valve assembly V1 to the isolation position. After all the gas to be transferred has been vaporized, the first trap B1 can be reconnected to the gas passage to transfer the vaporized gas in a concentrated manner.

[0081] (4) Analysis steps

[0082] like Figure 7 As shown, the second trap B2 detaches and is heated, causing the target substance to convert into a gaseous state. Because the second trap B2 is installed in the device in a detachable manner, it can be removed and isolated from the gas path. It can be heated in the isolated state, and after the target substance inside has been converted into a gaseous state, it can be connected to the device, which can make the target substance flow with the carrier gas more quickly.

[0083] (5) Injection procedure

[0084] like Figure 8a The diagram illustrates one implementation of the gas path for the injection step, in which the device includes two valve assemblies. The first port of the second valve assembly V2 is connected to its second port, and its fourth port is connected to its fifth port. After the second electrically controlled valve EPC2 is opened, it is reconnected to the second trap B2. The carrier gas, after passing through the second electrically controlled valve EPC2, the first port of the second valve assembly V2, and the second port of the second valve assembly V2, enters the second trap B2, carrying the target substance which has become gaseous. This gas then passes through the fifth port and the fourth port of the second valve assembly V2 before entering the chromatographic column SP to obtain the separation result of the target substance.

[0085] like Figure 8b As shown, the device includes three valve assemblies. If the target substance transferred previously can be accurately separated by the chromatographic column SP, the first port of the second valve assembly V2 is connected to its second port, and its fourth port is connected to its fifth port; the first port of the third valve assembly V3 is connected to its second port; after the second electrically controlled valve EPC2 is opened, it is reconnected to the second trap B2; the carrier gas, after passing through the second electrically controlled valve EPC2, the first port of the second valve assembly V2, and the second port of the second valve assembly V2, enters the second trap B2, carrying the target substance which has become gaseous. After passing through the first port of the third valve assembly V3 and the second port of the third valve assembly V3, it enters the chromatographic column SP to obtain the separation result of the target substance, which is finally analyzed by the mass spectrometer ZP. At this time, the separation requirement of the target substance can be completed by a single chromatographic column; therefore, no additional chromatographic column FSP is connected in this step.

[0086] If the target substance in the previous transfer could not be accurately separated by the SP column, an additional FSP column is required. Figure 9 As shown, this is the gas path implementation method for the second injection step. The second port of the second valve assembly V2 is connected to its third port, and its fourth port is connected to its fifth port; the first port of the third valve assembly V3 is connected to its tenth port, and its second port is connected to its third port; the second electrically controlled valve EPC2 is opened; the carrier gas enters the second trap B2 after passing through the second electrically controlled valve EPC2, the third port of the second valve assembly V2, and the second port of the second valve assembly V2, carrying the target substance which has become gaseous. After passing through the fifth port of the second valve assembly V2, the fourth port of the second valve assembly V2, the first port of the third valve assembly V3, and the tenth port of the third valve assembly V3, it passes through the additional chromatographic column FSP to obtain additional separation results. Then, after passing through the third port of the third valve assembly V3 and the second port of the third valve assembly V3, it enters the chromatographic column SP to obtain the separation results of the target substance. Finally, it is analyzed by a mass spectrometer ZP. Since the boiling point of the target substance exceeds the set range, a single chromatographic column cannot accurately achieve substance separation. Therefore, in this step, the position of the third valve assembly V3 is changed to connect an additional chromatographic column FSP, and the two chromatographic columns work together to complete the separation of multiple substances with different separation requirements.

[0087] In the above scheme, whether the target substance needs to be connected to the additional chromatographic column FSP can be judged based on experience. The additional chromatographic column FSP and the chromatographic column SP can be used for the separation of different kinds of substances. When the target substance contains substances that are applicable to the range of the additional chromatographic column FSP, connecting the additional chromatographic column FSP for pre-separation can ensure the separation effect.

[0088] In some schemes, column backflushing can be performed on the gas path by changing the connection state of the third valve assembly V3. The third port of the third valve assembly V3 is connected to its fourth port, the fifth port and the sixth port, and its ninth port is connected to its tenth port. The third electrically controlled valve EPC3 is open. The carrier gas passes through the third electrically controlled valve EPC3, the fourth port of the third valve assembly V3, the third port of the third valve assembly V3, the additional chromatographic column, the tenth port of the third valve assembly V3, and the ninth port of the third valve assembly V3 before entering the carbon dioxide filter Gc. Then, it passes through the sixth port and the fifth port of the third valve assembly V3 before being connected to the column backflushing instrument ZFC and discharged to clean the carbon dioxide filter Gc.

[0089] like Figure 10As shown, the device in this application also includes a dryer gas branch, which includes a dryer gas port GZQ and a fifth pressure sensor PI5, a dryer gas solenoid valve GZF, a dryer gas regulating valve GZ1, a third dryer G3, and a dryer gas flow meter L2 connected in sequence. The above solution can provide dryer gas to the device, and the pipeline that needs to be dried can be connected according to the scenario.

[0090] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

[0091] Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A condensation pre-concentration apparatus for trace organic gases, characterized by, include: A first valve assembly and a second valve assembly, both including six ports, and the second valve assembly including an isolation position, wherein when the second valve assembly is in the isolation position, its second and fifth ports are isolated, wherein: The first valve assembly has its first port connected to the sixth port of the second valve assembly, a first trap is provided between its second port and its fifth port, its third port is connected to the vent port, its fourth port is connected to the external sample gas port after passing through the first dryer, and its sixth port is connected to the carrier gas port through the first electrically controlled valve. The second valve assembly has a first port that is emptied, a second trap that is disposed between its second port and its fifth port, and the second trap that is isolated when the second valve assembly is in the isolation position. Its third port is connected to the carrier gas port via a second electrically controlled valve, and its fourth port is connected to the chromatographic column. The main controller is connected to the first valve assembly, the second valve assembly, the first trap, the second trap, the first solenoid valve, and the second solenoid valve.

2. The condensation and pre-concentration equipment for trace organic gases according to claim 1, characterized in that: The first valve assembly includes an isolation position, in which the first trap is isolated when the first valve assembly is in the isolation position.

3. The condensation pre-concentration apparatus of trace organic gases according to claim 1, characterized by, Also includes: A flow controller is disposed between the third port of the first valve assembly and the vent port; The flow controller is connected to the main controller.

4. The condensation pre-concentration apparatus of trace organic gases according to claim 3, characterized in that, Also includes: A first pressure sensor is disposed between the third port of the first valve assembly and the flow controller, and the first pressure sensor is connected to the main controller.

5. The condensation pre-concentration apparatus of trace organic gases according to claim 4, characterized in that, Also includes: The second dryer is located between the fifth port of the first valve assembly and the first trap.

6. The condensation pre-concentration apparatus of trace organic gases according to claim 4, wherein Also includes: A trap flow meter is disposed at the first port of the second valve assembly; A second pressure sensor is disposed between the first port of the second valve assembly and the trap flow meter; The second pressure sensor is connected to the main controller.

7. A condensation pre-concentration apparatus of trace organic gases according to any one of claims 4-6, characterized in that, It also includes a third valve assembly disposed between the first valve assembly and the second valve assembly, wherein: The third valve assembly includes ten ports. Its first port is connected to the fourth port of the second valve assembly, its second port is connected to the chromatographic column, an additional chromatographic column is disposed between its third port and the tenth port, its fourth port is connected to the carrier gas port after passing through the third electronically controlled valve, its fifth port is connected to the column backflush device, a carbon dioxide filter is disposed between its sixth port and the ninth port, its seventh port is connected to the first port of the first valve assembly, and its eighth port is connected to the sixth port of the second valve assembly. The controlled end of the third valve assembly is connected to the main controller.

8. The condensation pre-concentration apparatus of trace organic gases according to claim 7, characterized in that, Also includes: A third pressure sensor is located at the carrier gas port; A fourth pressure sensor is located between the external sample gas inlet port and the first dryer; Both the third pressure sensor and the fourth pressure sensor are connected to the main controller.

9. The condensation and pre-concentration equipment for trace organic gases according to claim 8, characterized in that, Also includes: A filter is disposed between the first pressure sensor and the flow controller.

10. The condensation pre-concentration apparatus of trace organic gases according to claim 9, characterized in that, Also includes: The drying gas branch includes a drying gas port and a fifth pressure sensor, a drying gas solenoid valve, a drying gas regulating valve, a third dryer, and a drying gas flow meter connected in sequence. The fifth pressure sensor, the drying gas solenoid valve, the drying gas regulating valve, the third dryer, and the drying gas flow meter are connected to the main controller.

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