Purge and trap system

Abstract

The invention discloses a purging and trapping system, and relates to the technical field of water body analysis. The purging and trapping system comprises a purging pipeline, a purging device, a first reversing device, a first trapping trap, a first desorption pipe, a first sample feeding pipe, a second reversing device, a second trapping trap, a second desorption pipe, a second sample feeding pipe and a first emptying pipe. By switching the states of the first reversing device and the second reversing device, the first trapping trap can be used for gas complementation and desorption sample introduction, and the first trapping trap and the second trapping trap can be used for synchronously trapping gas and respectively performing desorption sample introduction. The purging and trapping system can be respectively connected with two gas analysis instruments, so that different detection requirements can be met by utilizing one water body sample, the water body sample is saved, and the detection efficiency is also improved. When a high-concentration sample is analyzed, the high-concentration sample can be shunted to the two trapping traps for trapping and respective sample introduction, so that the high-concentration sample is prevented from polluting a sample introduction flow path.

Description

Technical Field

[0001] This application relates to the field of water analysis technology, and more specifically, to a purge and capture system. Background Technology

[0002] When analyzing the composition of water bodies, volatile substances are often purged from the water and passed through a trap, where the components to be detected are collected. The collected substances are then desorbed and sent to a gas analyzer for detection to determine the types and concentrations of volatile substances in the water. However, as a sample pretreatment device, purge-trap systems are prone to contamination of the entire sample flow path when analyzing high-concentration samples. For samples with unknown concentrations, stepwise dilution is required, which is time-consuming and cumbersome. Especially when quantification is needed and the diluted concentration is not within the linear range, the entire analysis process must be restarted, resulting in a huge workload. When analyzing unknown samples, it is desirable to analyze as many components as possible, requiring different traps to capture different types of components. However, existing purge-trap systems can only be configured with one trap, leading to multiple sample preparations if different traps are needed, increasing redundant workload. Furthermore, analysis cannot be performed when the sample volume is insufficient. Summary of the Invention

[0003] The purpose of this application is to provide a purge and capture system that can simultaneously capture a water sample using dual channels and can connect to two gas analyzers to meet the analytical needs of certain scenarios.

[0004] The embodiments of this application can be implemented as follows: This application provides a purge and trap system, including a purge line, a purge device, a first reversing device, a first trap, a first desorption tube, a first injection tube, a second reversing device, a second trap, a second desorption tube, a second injection tube, and a first exhaust tube. The purge line is connected to the inlet of the purge device, and the outlet of the purge device, the first trap, the first desorption tube, the first injection tube, and the first exhaust tube are all connected to the first reversing device. The pipeline between the first trap and the first reversing device is connected to the second reversing device through a branch pipe. The second trap, the second desorption tube, and the second injection tube are all connected to the second reversing device. Both the first reversing device and the second reversing device have a first state and a second state. When the first reversing device is in the first state, the first trap can trap the gas from the purge device; when the first reversing device is in the second state, the gas from the first desorption tube can be injected into the gas analyzer by passing through the first reversing device, the first trap, the first reversing device, and the first injection tube in sequence. When the second reversing device is in the first state, the second trap can capture the gas from the branch pipe; when the second reversing device is in the second state, the gas from the second desorption tube can be injected into the gas analyzer by passing through the second reversing device, the second trap, the second reversing device, and the second injection tube in sequence.

[0005] In an optional embodiment, the first reversing device is a six-way reversing valve. The outlet of the purging device, the first vent pipe, the first end of the first trap, the second end of the first trap, one end of the first desorption pipe, and one end of the first injection pipe are respectively connected to the six ports of the first reversing device. The upstream end of the shunt branch pipe is connected to the pipeline between the first end of the first trap and the first reversing device. The second reversing device is a six-way reversing valve. The shunt branch pipe, the first vent pipe, the first end of the second trap, the second end of the second trap, one end of the second desorption tube, and one end of the second injection tube are respectively connected to the six ports of the second reversing device.

[0006] In an optional embodiment, a water separator is provided on the pipeline between the first end of the first trap and the first reversing device, and the water separator is located between the upstream end of the branch pipe and the first reversing device.

[0007] In an optional embodiment, a first solenoid valve is provided on the pipeline between the first end of the first trap and the first reversing device, and the first solenoid valve is located between the upstream end of the branch pipe and the first trap.

[0008] In an optional implementation, a proportional valve is provided on the diversion branch pipe, and the purge and capture system also includes a second drain pipe, the upstream end of which is connected to the diversion branch pipe between the proportional valve and the second reversing device.

[0009] In an optional embodiment, a second solenoid valve is provided on the first vent pipe, and a third solenoid valve is provided on the second vent pipe.

[0010] In an optional implementation, a proportional valve and a flow sensor are provided on the branch pipe, with the flow sensor electrically connected to the proportional valve.

[0011] In an optional embodiment, at least one of the first injection tube and the second injection tube is connected to at least two injection branches, each injection branch being used to connect to a gas analyzer.

[0012] In an optional implementation, a fourth solenoid valve is provided on each injection branch.

[0013] In an optional implementation, at least one injection branch is provided with a flow control module.

[0014] The beneficial effects of the purge and trap system provided in this application include: The purge and trap system provided in this application includes a purge line, a purge device, a first reversing device, a first trap, a first desorption tube, a first injection tube, a second reversing device, a second trap, a second desorption tube, a second injection tube, and a first venting tube. The purge line is connected to the inlet of the purge device. The outlet of the purge device, the first trap, the first desorption tube, the first injection tube, and the first venting tube are all connected to the first reversing device. The pipeline between the first trap and the first reversing device is connected to the second reversing device through a branch pipe. The second trap, the second desorption tube, and the second injection tube are all connected to the second reversing device. Since the purge and trap system of this application includes two traps, namely the first trap and the second trap, by switching the states of the first reversing device and the second reversing device, the first trap can be used for gas replenishment and desorption injection, or the first trap and the second trap can be used simultaneously for gas capture and desorption injection respectively. The first and second inlet tubes of the purge-and-trap system can be connected to two gas analyzers respectively, thus allowing a single water sample to meet different detection needs, saving water sample and improving detection efficiency. When analyzing high-concentration samples, the sample can also be split into two traps for capture and separate injection, avoiding contamination of the injection path by high-concentration samples. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a purge and trap system provided in one embodiment of this application; Figure 2 This is a schematic diagram of the gas flow direction when using a first trapping trap for gas capture in one embodiment of this application; Figure 3 This is a schematic diagram of the gas flow direction when using a first trapping trap for gas capture in another embodiment of this application; Figure 4 This is a schematic diagram of the gas flow direction during desorption injection using a first trap in one embodiment of this application; Figure 5 This is a schematic diagram of the gas flow direction when using a first trap and a second trap for gas capture in one embodiment of this application; Figure 6 This is a schematic diagram of the gas flow direction during desorption injection using a first trap and a second trap in one embodiment of this application.

[0017] Icons: 100 - Purge line; 110 - Second flow control module; 120 - Fifth solenoid valve; 200 - Purge device; 310 - First reversing device; 320 - First trap; 330 - First solenoid valve; 340 - Water separator; 350 - First desorption tube; 360 - First injection tube; 361 - Injection branch tube; 362 - Fourth solenoid valve; 363 - First flow control module; 370 - Branch tube; 371 - Proportional valve; 372 - Flow sensor; 410 - Second reversing device; 420 - Second trap; 430 - Second desorption tube; 440 - Second injection tube; 450 - Second vent tube; 451 - Third solenoid valve; 500 - First vent tube; 510 - Second solenoid valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0024] The purge-and-trap system in related technologies consists of only one trap connected to a gas analyzer. Therefore, when analyzing multiple components of an unknown sample, multiple water samples need to be prepared, and multiple traps are required to capture different types of components. This leads to low analytical efficiency and is difficult to implement with a small sample size.

[0025] Therefore, this application provides a purge and trap system that sets up two traps and allows selective use of one or both for gas trapping via a switching device. It can also connect to two gas analyzers for gas analysis, thereby improving analysis efficiency and saving water samples.

[0026] Figure 1 This is a schematic diagram of the purge and trap system provided in one embodiment of this application. Figure 1 As shown, the purge and trap system provided in this application includes a purge line 100, a purge device 200, a first reversing device 310, a first trap 320, a first desorption tube 350, a first sample inlet tube 360, a second reversing device 410, a second trap 420, a second desorption tube 430, a second sample inlet tube 440, and a first exhaust tube 500. The purge line 100 is connected to the inlet of the purge device 200, and the outlet of the purge device 200 is connected to the first exhaust tube 500. A trap 320, a first desorption tube 350, a first sample inlet tube 360, and a first vent tube 500 are all connected to a first reversing device 310. The pipeline between the first trap 320 and the first reversing device 310 is connected to a second reversing device 410 through a branch pipe 370. A proportional valve 371 is installed on the branch pipe 370. The second trap 420, the second desorption tube 430, and the second sample inlet tube 440 are all connected to the second reversing device 410.

[0027] Both the first reversing device 310 and the second reversing device 410 have a first state and a second state. When the first reversing device 310 is in the first state, the gas from the purge device 200 can be discharged to the outside by sequentially passing through the first reversing device 310, the first trap 320, the first reversing device 310, and the first exhaust pipe 500. That is, the first trap 320 can capture the gas from the purge device 200. When the first reversing device 310 is in the second state, the gas from the purge device 200 can be discharged to the outside by sequentially passing through the first reversing device 310 and the first exhaust pipe 500, and the gas from the first desorption tube 350 can be injected into the gas analyzer by sequentially passing through the first reversing device 310, the first trap 320, the first reversing device 310, and the first sample inlet tube 360. When the second reversing device 410 is in the first state, the gas from the branch pipe 370 can pass through the second reversing device 410, the second trap 420, the second reversing device 410, and the first vent pipe 500 in sequence and be discharged to the outside. That is, the second trap 420 can capture the gas from the branch pipe 370. When the second reversing device 410 is in the second state, the gas from the branch pipe 370 can pass through the second reversing device 410 and the first vent pipe 500 in sequence and be discharged to the outside. The gas from the second desorption tube 430 can pass through the second reversing device 410, the second trap 420, the second reversing device 410, and the second injection tube 440 in sequence and be injected into the gas analyzer.

[0028] In this embodiment, the first reversing device 310 is a six-way reversing valve. The outlet of the purge device 200, the first vent pipe 500, the first end of the first trap 320, the second end of the first trap 320, one end of the first desorption pipe 350, and one end of the first injection pipe 360 ​​are respectively connected to the six ports of the first reversing device 310. The upstream end of the shunt branch pipe 370 is connected to the pipeline between the first end of the first trap 320 and the first reversing device 310. In this embodiment, the first reversing device 310 has ports 1-6. Port 1 of the first reversing device 310 is connected to the outlet of the purge device 200, port 2 is connected to the first end of the first trap 320, port 3 is connected to one end of the first injection pipe 360, port 4 is connected to one end of the first desorption pipe 350, port 5 is connected to the second end of the first trap 320, and port 6 is connected to the first vent pipe 500. When the first commutator 310 is in the first state, port 1 and port 2 are connected, port 3 and port 4 are connected, and port 5 and port 6 are connected; when the first commutator 310 is in the second state, port 2 and port 3 are connected, port 4 and port 5 are connected, and port 1 and port 6 are connected.

[0029] Similarly, the second reversing device 410 is also a six-way reversing valve. The branch pipe 370, the first vent pipe 500, the first end of the second trap 420, the second end of the second trap 420, one end of the second desorption pipe 430, and one end of the second sample inlet pipe 440 are respectively connected to the six ports of the second reversing device 410. The second reversing device 410 and the first reversing device 310 can use the same model. The switching method is not described here, but can be found in the switching principle of the first reversing device 310.

[0030] Figure 2 This is a schematic diagram of the gas flow direction when using the first trap 320 for gas trapping in one embodiment of this application. Figure 2As shown, in one embodiment, when gas is captured using the first trap 320, the first reversing device 310 can be in a first state, and the proportional valve 371 can be closed, meaning the branch pipe 370 is not flowing. All gas delivered from the outlet of the purging device 200 will pass through the first trap 320, where the target component is captured, and other gases are discharged through the first vent pipe 500. During this process, the second trap 420 is idle.

[0031] Figure 3 This is a schematic diagram of the gas flow direction when using the first trap 320 for gas trapping in another embodiment of this application. Figure 3 As shown, with Figure 2 The difference is that the proportional valve 371 is not completely closed, but maintains a certain opening; and the second reversing device 410 is in the second state, so the gas flowing out of the branch pipe 370 can flow directly to the first vent pipe 500 for discharge, and will not enter the second trap 420. This can prevent all the gas from passing through the first trap 320, thus achieving the function of diversion and dilution.

[0032] Figure 4 This is a schematic diagram of the gas flow direction during desorption injection using the first trap 320 in one embodiment of this application. Figure 4 As shown, when desorption injection is performed using the first trap 320, the first reversing device 310 is in a second state. That is, the gas from the first desorption tube 350 can sequentially pass through the first reversing device 310, the first trap 320, the first reversing device 310, and the first injection tube 360 ​​to be injected into the gas analyzer. It can be understood that the gas from the first desorption tube 350 can carry away the components previously trapped by the first trap 320 (i.e., desorbed by the first trap 320) and carry these components to the first injection tube 360, and then flow to the gas analyzer for analysis. Simultaneously, the gas from the purge device 200 can sequentially pass through the first reversing device 310 and the first vent tube 500 to be discharged to the outside, without passing through the first trap 320. During desorption, the proportional valve 371 is closed.

[0033] Figure 5 This is a schematic diagram of the gas flow direction when using a first trap 320 and a second trap 420 for gas capture in one embodiment of this application. Figure 5 As shown, when using the first trap 320 and the second trap 420 for gas capture, both the first reversing device 310 and the second reversing device 410 can be in the first state, and the proportional valve 371 can be opened. A portion of the gas delivered from the outlet of the purge device 200 passes through the first trap 320, and a portion passes through the second trap 420. The target component is captured by the first trap 320 and the second trap 420, while other gases are discharged through the first vent pipe 500.

[0034] Figure 6 This is a schematic diagram of the gas flow direction during desorption and sample introduction using a first trap 320 and a second trap 420 in one embodiment of this application. Figure 6 As shown, when desorption injection is performed using the first trap 320 and the second trap 420, both the first reversing device 310 and the second reversing device 410 are in the second state. That is, the gas from the first desorption tube 350 can sequentially pass through the first reversing device 310, the first trap 320, the first reversing device 310, and the first injection tube 360 ​​to be injected into the gas analyzer. The gas from the second desorption tube 430 can sequentially pass through the second reversing device 410, the second trap 420, the second reversing device 410, and the second injection tube 440 to be injected into another gas analyzer. Meanwhile, the gas from the purging device 200 can be discharged to the outside through the first reversing device 310 and the first vent pipe 500 in sequence, without passing through the first trap 320; the gas from the diversion branch pipe 370 can be discharged to the outside through the second reversing device 410 and the first vent pipe 500 in sequence (or the proportional valve 371 can be closed to prevent gas flow in the diversion branch pipe 370).

[0035] It is understandable that the first injection tube 360 ​​and the second injection tube 440 can be connected to the same type of gas analyzer; or they can be connected to different types of gas analyzers to meet different detection needs.

[0036] Optionally, a water separator 340 is installed on the pipeline between the first end of the first trap 320 and the first reversing device 310, and the water separator 340 is located between the upstream end of the branch pipe 370 and the first reversing device 310. By installing the water separator 340, moisture in the gas can be removed, preventing excessive moisture from entering the first trap 320 and the second trap 420, and reducing the interference of moisture on detection.

[0037] Optionally, a first solenoid valve 330 is provided on the pipeline between the first end of the first trap 320 and the first reversing device 310, and the first solenoid valve 330 is located between the upstream end of the branch pipe 370 and the first trap 320. By closing the first solenoid valve 330, all gas from the purge device 200 can flow to the second reversing device 410 through the branch pipe 370, which is suitable for scenarios where only the second trap 420 needs to be used.

[0038] Optionally, the purge and trap system further includes a second vent pipe 450, the upstream end of which is connected to a branch pipe 370 between the proportional valve 371 and the second reversing device 410. In some scenarios, it is necessary to reduce the gas flowing from the branch pipe 370 to the second reversing device 410, which can be achieved through the second vent pipe 450. For example, if the gas concentration flowing from the branch pipe 370 to the second reversing device 410 is too high, it can be diluted through the second vent pipe 450. In this embodiment, a second solenoid valve 510 is provided on the first vent pipe 500, and a third solenoid valve 451 is provided on the second vent pipe 450.

[0039] Optionally, a flow sensor 372 is installed on the branch pipe 370, and the flow sensor 372 is electrically connected to the proportional valve 371. The flow sensor 372 can monitor the flow rate of the branch pipe 370 in real time, and adjust the flow rate of the branch pipe 370 in real time through linkage with the proportional valve 371.

[0040] Optionally, at least one of the first injection tube 360 ​​and the second injection tube 440 is connected to at least two injection branches, each of which is used to connect to a gas analyzer. This configuration allows the purge-and-trap system to connect to more gas analyzers, thereby improving detection efficiency. In this embodiment, the first injection tube 360 ​​is connected to two injection branches. Furthermore, each injection branch is equipped with a fourth solenoid valve 362.

[0041] Optionally, at least one injection branch is equipped with a first flow control module 363. By setting the first flow control module 363, the flow rate of the injection branch 361 can be detected, thereby facilitating the adjustment of the flow rate via the fourth solenoid valve 362.

[0042] In this embodiment, a second flow control module 110 is also provided on the air blowing pipeline 100 for detecting the gas flow rate in the air blowing pipeline 100; a fifth solenoid valve 120 is also provided on the air blowing pipeline 100, through which the flow rate in the air blowing pipeline 100 can be adjusted.

[0043] In summary, the embodiments of this application provide a purge and trap system, including a purge pipeline 100, a purge device 200, a first reversing device 310, a first trap 320, a first desorption tube 350, a first injection tube 360, a second reversing device 410, a second trap 420, a second desorption tube 430, a second injection tube 440, and a first exhaust tube 500. The purge pipeline 100 is connected to the inlet of the purge device 200. The outlet of the purge device 200, the first trap 320, the first desorption tube 350, the first injection tube 360, and the first exhaust tube 500 are all connected to the first reversing device 310. The pipeline between the first trap 320 and the first reversing device 310 is connected to the second reversing device 410 through a branch pipe 370. The second trap 420, the second desorption tube 430, and the second injection tube 440 are all connected to the second reversing device 410. Since the purge and trap system of this application includes two traps, namely the first trap 320 and the second trap 420, by switching the states of the first reversing device 310 and the second reversing device 410, gas can be collected and desorbed using the first trap 320, or gas can be collected simultaneously using the first trap 320 and the second trap 420, and desorbed and injected separately. The first sample inlet tube 360 ​​and the second sample inlet tube 440 of the purge and trap system can be connected to two gas analyzers respectively, so a single water sample can meet different detection needs, saving water samples and improving detection efficiency. When analyzing high-concentration samples, the sample can also be collected and injected separately by diverting the sample to the two traps, avoiding contamination of the injection path by high-concentration samples.

[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A purge and trap system, characterized in that, The device includes a blowing line (100), a purging device (200), a first reversing device (310), a first trap (320), a first desorption tube (350), a first sample inlet tube (360), a second reversing device (410), a second trap (420), a second desorption tube (430), a second sample inlet tube (440), and a first exhaust tube (500). The blowing line (100) is connected to the inlet of the purging device (200), and the outlet of the purging device (200), the first trap (320), the first desorption tube (350), and the first exhaust tube (500) are connected to the exhaust tube. The first sample inlet tube (360) and the first vent tube (500) are both connected to the first reversing device (310). The pipeline between the first trap (320) and the first reversing device (310) is connected to the second reversing device (410) through a branch pipe (370). The second trap (420), the second desorption tube (430), and the second sample inlet tube (440) are all connected to the second reversing device (410). The first reversing device (310) and the second reversing device (410) both have a first state and a second state. When the first reversing device (310) is in the first state, the first trap (320) can trap the gas from the purge device (200); when the first reversing device (310) is in the second state, the gas from the first desorption tube (350) can be sequentially passed through the first reversing device (310), the first trap (320), the first reversing device (310), and the first injection tube (360) to be injected into the gas analyzer. When the second reversing device (410) is in the first state, the second trap (420) can trap the gas from the branch pipe (370); when the second reversing device (410) is in the second state, the gas from the second desorption tube (430) can be injected into the gas analyzer by passing through the second reversing device (410), the second trap (420), the second reversing device (410), and the second injection tube (440) in sequence.

2. The purge and trapping system according to claim 1, characterized in that, The first reversing device (310) is a six-way reversing valve. The outlet of the purging device (200), the first vent pipe (500), the first end of the first trap (320), the second end of the first trap (320), one end of the first desorption tube (350), and one end of the first injection tube (360) are respectively connected to the six ports of the first reversing device (310). The upstream end of the branch pipe (370) is connected to the pipeline between the first end of the first trap (320) and the first reversing device (310). The second reversing device (410) is a six-way reversing valve. The branch pipe (370), the first drain pipe (500), the first end of the second trap (420), the second end of the second trap (420), one end of the second desorption tube (430), and one end of the second injection tube (440) are respectively connected to the six ports of the second reversing device (410).

3. The purge and trapping system according to claim 2, characterized in that, A water separator (340) is provided on the pipeline between the first end of the first trap (320) and the first reversing device (310), and the water separator (340) is located between the upstream end of the branch pipe (370) and the first reversing device (310).

4. The purge and trapping system according to claim 2, characterized in that, A first solenoid valve (330) is provided on the pipeline between the first end of the first trap (320) and the first reversing device (310), and the first solenoid valve (330) is located between the upstream end of the branch pipe (370) and the first trap (320).

5. The purge and trapping system according to claim 1, characterized in that, A proportional valve (371) is provided on the diversion branch pipe (370), and the purge and capture system also includes a second vent pipe (450), the upstream end of which is connected to the diversion branch pipe (370) between the proportional valve (371) and the second reversing device (410).

6. The purge and trapping system according to claim 5, characterized in that, A second solenoid valve (510) is provided on the first vent pipe (500), and a third solenoid valve (451) is provided on the second vent pipe (450).

7. The purge and trapping system according to claim 1, characterized in that, The branch pipe (370) is equipped with a proportional valve (371) and a flow sensor (372), and the flow sensor (372) is electrically connected to the proportional valve (371).

8. The purge and trapping system according to claim 1, characterized in that, At least one of the first injection tube (360) and the second injection tube (440) is connected to at least two injection branches, each of which is used to connect to a gas analyzer.

9. The purge and trapping system according to claim 8, characterized in that, Each of the aforementioned injection branches is equipped with a fourth solenoid valve (362).

10. The purge and trapping system according to claim 9, characterized in that, At least one of the injection branches is equipped with a flow control module.

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