Multi-channel acquisition and online monitoring system and method

Abstract

The invention discloses a multichannel collection and online monitoring system, the system comprises a collection device, a sampling pipeline and a monitor, the sampling pipeline is arranged in a target area to collect gas in the target area, and the collection device is communicated between the sampling pipeline and the monitor; the sampling pipeline comprises a plurality of pipelines which are respectively arranged in each target area; all the pipelines are communicated with the collecting device. The valve body is rotated through the stepping motor, connection and disconnection of different pipelines are controlled, it is guaranteed that only one sample can enter the monitor to be detected, the samples between the different pipelines cannot be mixed in the multi-channel collecting device, and independence and accuracy of the samples are guaranteed.

Description

Technical Field

[0001] The present application relates to the field of detection and supervision systems, and in particular to a system and method for multi-channel acquisition and online monitoring. Background Art

[0002] The existing offline laboratory method collects samples at various points and then returns them to the laboratory for analysis and testing. However, there are many factors in the collection, transportation, and pretreatment processes that affect the actual concentration of the samples. These factors include but are not limited to the collection method, storage method, transportation time, pretreatment method, etc.; the online method in most cases monitors a single point or a few points, which is limited by the detection speed of the online method and the switching speed of the pipeline, and there is a lack of suitable pipeline switching devices. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present application provides a system and method for multi-channel acquisition and online monitoring.

[0004] This application intends to design a multi-channel collection device, combined with the flow path design of the entire system, to achieve online monitoring of pollutants at multiple points or flow paths using the same analysis and detection system.

[0005] The trajectory formed by a certain point on the surface of the valve body or shell as the valve body or shell rotates is defined as the latitude line. The semicircular arc connecting the two ends of the valve body or shell rotation center axis on the surface of the valve body or shell is defined as the meridian line.

[0006] The plane perpendicular to the rotation center axis of the valve body or shell and passing through the center of the sphere is defined as the equatorial plane. The latitude is defined as the line-surface angle between the normal line of a point on the valve body or shell and the equatorial plane. The position of the valve body or shell in the main pipeline or main channel is defined as the north latitude, and vice versa as the south latitude.

[0007] The specific technical solutions of this application are as follows:

[0008] 1. A multi-channel collection and online monitoring system, wherein the system comprises a collection device, a sampling pipeline and a monitor, the sampling pipeline is arranged in a target area to collect gas in the target area, and the collection device is connected between the sampling pipeline and the monitor;

[0009] The sampling pipeline includes a plurality of pipelines respectively arranged in each target area; all pipelines are connected to the collection device.

[0010] 2. A system according to item 1, wherein the collection device comprises a shell, on which a main pipe and a branch pipe are arranged; the main pipe is connected to the monitoring instrument, and the branch pipe is connected to the pipeline.

[0011] 3. A system according to item 2, wherein the collection device comprises a valve body, the valve body is arranged inside the shell, and the valve body can control the connection and disconnection of the branch pipeline and the main pipeline.

[0012] 4. A system according to item 3, wherein the valve body is rotationally connected to the housing, and the valve body is capable of rotating inside the housing.

[0013] 5. A system according to item 3 or 4, wherein a main channel and a branch channel are opened on the valve body, and the branch channel is connected to the main channel; the main channel is connected to the main pipeline, and the branch channel can be connected to the branch pipeline as the valve body rotates.

[0014] 6. The system according to item 3 or 4, wherein the branch channel is provided with one or more than two; and the branch pipe is evenly provided with a plurality of branch pipes on the housing;

[0015] Preferably, 4 to 12 branch pipes are arranged in the latitude direction of the shell, and more preferably 8 branch pipes are arranged;

[0016] Further preferably, 2 to 8 branch pipes are arranged in the meridian direction of the shell, and further preferably 4 branch pipes are arranged.

[0017] 7. The system according to item 3 or 4, wherein the housing comprises an upper housing and a lower housing, the main pipeline is arranged on the upper housing, a motor for driving the valve body to rotate is arranged on the lower housing, a connecting hole for connecting the valve body and the motor is opened on the lower housing; a housing sealing ring is arranged between the upper housing and the lower housing;

[0018] Preferably, the electrode is a stepper motor;

[0019] Further preferably, the rotation angle of the stepper motor each time is 10 to 12;

[0020] Further preferably, the stepper motor rotates at an angle of 11.5° each time.

[0021] 8. A system according to item 3 or 4, wherein the valve body comprises an upper valve body and a lower valve body; a main channel is opened on the upper valve body, and a driving hole for connecting to a motor is opened on the lower valve body; a valve body sealing ring is provided at the connection between the upper valve body and the lower valve body.

[0022] 9. The system according to item 1, wherein a three-way valve is provided on the pipeline, and the three-way valve is provided in a target area corresponding to the pipeline.

[0023] 10. A system according to item 1, wherein the collection pipeline includes a bus and a sampling pump, the sampling pump is connected to the bus, and all pipelines are connected to the bus; a first flow controller is provided on each pipeline.

[0024] 11. The system according to item 10, wherein the flow rate on the pipeline is 5 to 20 L / min; preferably 10 L / min.

[0025] 12. According to the system described in item 1, a detection three-way valve is arranged between the collection device and the monitoring instrument; the detection three-way valve is connected to a detection pump, and a second flow controller is arranged between the detection pump and the detection three-way valve.

[0026] 13. A system according to item 12, wherein the flow rate at the three-way valve is detected to be 0.5 to 5 L / min; preferably 1 L / min.

[0027] 14. A method for multi-channel acquisition and online monitoring using the system described in any one of items 1 to 13, comprising the following steps:

[0028] placing pipelines for circulating gas in the plurality of target areas;

[0029] The sampling end of the tubing is located in the target area;

[0030] The sampling ends obtain samples in respective target areas;

[0031] Controlling the sampling device to deliver the sample in the desired target area to the monitor;

[0032] The collection device is set up near the monitoring instrument.

[0033] 15. The method according to item 14, wherein the flow rate of the pipeline during sampling is 5 to 20 L / min, preferably 10 L / min.

[0034] 16. The method according to item 14, wherein the flow rate when delivering the sample to the monitor is 0.5 to 5 L / min; preferably 1 L / min.

[0035] 17. The method according to item 14, wherein a three-way valve is provided at the sampling end of the pipeline; and all pipelines are connected to the bus bar.

[0036] Beneficial Effects

[0037] The multi-channel acquisition device of the present application controls the on and off of different pipelines by rotating the valve body through a stepper motor, thereby ensuring that samples from only one pipeline can enter the monitor for detection, and that samples from different pipelines will not be mixed in the multi-channel acquisition device, thereby ensuring the independence and accuracy of the samples; the detection pump continuously extracts at the monitor end to ensure that the samples in the pipeline between the monitor and the acquisition device can be quickly updated, and the distance between the detection three-way valve at the front end of the monitor and the detection pump is as short as possible to reduce mutual interference in sample switching.

[0038] The multi-channel collection device in this application is easy to disassemble, and the whole system is easy to perform leak detection, cleaning and maintenance. The collection device has high universality and can be adapted to online monitoring equipment with rapid monitoring capabilities. The number of pipelines has strong scalability, and the appropriate size can be selected according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is the overall structure diagram of the detection system of this application;

[0040] Figure 2 It is an exploded view of the acquisition device of this application;

[0041] Figure 3 It is a cross-sectional view of the collection device of the present application;

[0042] Figure 4 This is an exploded view of the valve body structure of this application;

[0043] Figure 5 It is a cross-sectional view of the valve body structure of the present application.

[0044] In the figure, 1. upper shell; 11. main pipeline; 12. shell sealing ring; 13. branch pipeline; 2. lower shell; 22. motor; 3. upper valve body; 31. main channel; 32. valve body sealing ring; 33. branch channel; 4. lower valve body; 5. three-way valve; 51. first flow controller; 52. bus; 53. sampling pump; 6. monitor; 61. detection three-way valve; 62. second flow controller; 63. detection pump. DETAILED DESCRIPTION

[0045] The present application is described in detail below. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0046] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the functional differences of components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" are open-ended terms and should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present application, but the description is based on the general principles of the specification and is not intended to limit the scope of the present application. The scope of protection of the present application shall be determined by the attached claims.

[0047] refer to Figure 1 and Figure 2 The present application provides a multi-channel collection and online monitoring system. The system includes a collection device, a sampling pipeline and a monitor 6. The sampling pipeline is arranged in a target area to collect gas in the target area. The collection device is connected between the sampling pipeline and the monitor 6.

[0048] The system is used to monitor the target area in real time, wherein the target area can be one area or multiple areas.

[0049] When the target area includes a sampling area, the collection management only needs to be laid in the sampling area, and the collection device and the monitoring instrument 6 only need to perform real-time monitoring on the sampling area.

[0050] When the target area includes multiple independent sampling areas, the collection pipeline needs to be laid in each sampling area. Then the collection device collects samples from the required sampling areas in each sampling area according to the needs; and then the collected samples are transported to the monitoring instrument 6 for real-time monitoring.

[0051] In the present application, the target area includes a plurality of mutually independent sampling areas.

[0052] The sampling pipeline is laid in each sampling area, and the sampling pipeline can collect samples from all sampling areas in the target area at the same time, and then the samples are taken to the monitor 6 for detection under the action of the collection device. Thus, the purpose of real-time monitoring of the target area is achieved. In addition, the sampling pipeline is laid in the target area, making it more convenient to sample in the target area, thereby improving the efficiency of real-time monitoring of the target area.

[0053] The sampling pipeline comprises a plurality of pipelines respectively arranged in each sampling area of ​​the target area; all pipelines are connected to the collection device.

[0054] The tubing located in each sampling area of ​​the target area enables sampling in the target area.

[0055] In a specific embodiment, the sample taken from the target area is the gas in the target area.

[0056] The target area is sampled using a pipeline. On the one hand, it is convenient to lay the pipeline in the target area, with simple process and convenient construction. The laying efficiency of the pipeline is improved and the laying cost of the pipeline is reduced. On the other hand, the pipeline has good sealing performance, which can not only reduce gas leakage, so that the sample can smoothly enter the monitor 6, but also prevent the sample from being contaminated in the pipeline, reducing the possibility of external gas contaminating the sample.

[0057] refer to Figure 1 and Figure 2After the pipeline takes the sample in the target area, it is transported to the monitor 6 for monitoring through the collection device. Since each area in the target area is independent of each other, in order to reduce the mutual interference between the pipelines corresponding to the target area, the pipeline is also provided with multiple pipelines, and each pipeline corresponds to each area of ​​the target area one by one, so that the pipeline can and only samples the corresponding area.

[0058] The collection device samples the target area through the pipeline, and the sampling device is connected to all the pipelines, so the collection device can sample each sampling area. In addition, the collection device is integrated and connected to all the pipelines. When the monitor 6 is required to monitor, it is only necessary to control the collection device to collect samples in the required sampling area. It is convenient for the collection device to collect samples, and it can also reduce the complexity between the collection device and management, thereby improving the fault tolerance of the collection device and management when sampling.

[0059] refer to Figure 1 and Figure 2 On the other hand, after the collection device is connected to all pipelines, the other end is connected to the monitor 6. Therefore, the collection device is set close to the monitor 6 to reduce the path between the monitor 6 and the collection device. After the collection device collects the sample, it can be directly transported to the monitor 6. In addition, when collecting samples from multiple sampling areas, due to the extremely short path between the collection device and the monitor 6, the residual samples between the collection device and the monitor 6 become extremely small, further reducing the possibility of influence between samples in multiple sample areas, and improving the accuracy of the monitor 6 monitoring the sample area. The monitoring accuracy and efficiency of the monitor 6 on the sample area are significantly improved.

[0060] refer to Figure 2 and Figure 3 , the collection device includes a shell and a valve body.

[0061] A main pipeline 11 and a branch pipeline 13 are arranged on the housing; the main pipeline 11 is connected to the monitoring instrument 6, and the branch pipeline 13 is connected to the pipeline.

[0062] refer to Figure 2 and Figure 3 The valve body is arranged inside the shell, and the valve body can control the connection and disconnection of the branch pipeline 13 and the main pipeline 11.

[0063] One main pipeline is provided, and is communicated with the monitoring instrument 6. A plurality of branch pipelines 13 are provided, and the branch pipelines 13 are communicated with the pipelines respectively.

[0064] refer to Figure 2 and Figure 3When the valve body rotates inside the shell, the main pipeline 11 is connected to one of the multiple branch pipelines 13, and the remaining branch pipelines 13 are blocked. That is, the valve body rotates inside the shell to control the main pipeline 11 to be connected to one and only one branch pipeline 13.

[0065] refer to Figure 2 and Figure 3 When sampling the sampling area, the valve body is controlled to rotate so that the pipeline and branch pipeline 13 corresponding to the sampling pipeline are connected to the main pipeline 11, and then the gas in the sampling area passes through the pipeline, branch pipeline 13, main pipeline 11 in turn, and then enters the monitor 6 for monitoring.

[0066] Specifically, the number of branch pipes 13 is greater than or equal to the number of sampling areas in the target area. Therefore, there is at least one pipeline and branch pipe 13 corresponding to the sampling area, so that the gas in the sampling area can be sampled into the monitor 6.

[0067] refer to Figure 2 and Figure 3 , the distance between the main pipeline 11 and the monitoring instrument 6 is set within a smaller range.

[0068] After the branch pipe 13 and the pipeline absorb the gas in the sampling area, the sample is transferred to the main pipe 11 at the shell and the valve core, and the main pipe 11 transports the sample to the monitor 6. When sampling in another sampling area, the sample gas in the previous sample area will remain between the main pipe 11 and the monitor 6. Therefore, the gas sampled previously will affect the gas sampled later. In order to reduce the impact between the sample gases in different sample areas, the main pipe 11 and the monitor 6 are set close to each other, thereby reducing the drying between different gas samples and improving the accuracy of monitoring the target area.

[0069] refer to Figure 2 and Figure 3 The valve body is rotatably connected to the shell, and the valve body can rotate inside the shell.

[0070] The valve body is provided with a main channel 31 and a branch channel 33 , and the branch channel 33 is connected to the main channel 31 ; the main channel 31 is connected to the main pipeline 11 , and the branch channel 33 can be connected to the branch pipeline 13 as the valve body rotates.

[0071] The valve body can rotate inside the housing, and the housing can also block the branch channel 33 on the valve body.

[0072] refer to Figure 2 and Figure 3 In a specific embodiment, the shell and the valve body are both spherical structures.

[0073] refer to Figure 2 and Figure 4 The main channel 31 and the branch channel 33 are both opened along the outer surface of the valve body toward the inside of the valve body. And the branch channels 33 are both connected to the outer surface of the valve body, so that the main channel 31 and the branch channel 33 can be connected to the branch pipe 13 and the main pipe 11 on the shell.

[0074] refer to Figure 2 and Figure 4 The main channel 31 coincides with the central axis of the valve body rotation, so when the valve body rotates, the main channel 31 will not change position with the rotation of the valve body. The branch channels 33 are all arranged away from the valve body rotation axis; therefore, when the valve body rotates, the branch channels 33 will change accordingly.

[0075] refer to Figure 3 and Figure 4 The main pipeline 11 is coaxially arranged with the main channel 31, and the main pipeline 11 is also coaxially arranged with the rotation axis of the valve body. Therefore, when the valve core rotates, the main channel 31 is always connected with the main pipeline 11.

[0076] refer to Figure 4 and Figure 5 In a specific embodiment, the main channel 31 and the branch channels 33 are both connected to the spherical center position of the valve body, so that the main channel 31 is connected to all the branch channels 33 at a position close to the spherical center.

[0077] In another specific embodiment, the branch channels 33 are connected to the main channel 31 at a position deviated from the center of the ball, that is, all the branch channels 33 are connected to the main channel 31 .

[0078] One end of the branch channel 33 on the outer surface of the valve body is an open end, and the end connected to the main channel 31 is a connecting end.

[0079] refer to Figure 4 When the branch channel 33 is opened on the valve body, the opening end of the branch channel 33 overlaps with the branch pipe 13 on the shell in the latitude direction; that is, when the valve body rotates, the branch pipe 13 is located on the latitude where the opening end of the branch channel 33 is located. So that when the valve body rotates, the branch channel 33 can be coaxially aligned with the branch pipe 13, and then the branch channel 33 is connected with the branch pipe 13.

[0080] refer to Figure 2 and Figure 3In a specific embodiment, a plurality of branch channels 33 are provided. Specifically, the branch channels 33 are used to communicate with the branch pipes 13, so the number of latitudes of the shell where all the branch pipes 13 are located is the same as the number of the branch pipes 13. For example: the branch pipes 13 are respectively arranged at the positions of the shell at 30° and 45° south latitude and 30° and 45° north latitude; that is, the branch pipes 13 are arranged at the four latitude positions of the shell, so four branch channels 33 are opened on the valve body, and the opening ends of the four branch channels 33 are respectively located at the positions of 30° and 45° south latitude and 30° and 45° north latitude of the valve body.

[0081] refer to Figure 2 and Figure 3 On the latitude, a plurality of branch pipes 13 can also be arranged. The plurality of branch pipes 13 arranged on the same latitude will be connected to the same branch channel 33 when the valve body rotates.

[0082] When the branch pipes 13 are arranged on the housing, the branch pipes 13 are located on different meridians. That is, all the branch pipes 13 do not overlap in the meridian direction. Therefore, when the branch channel 33 is connected to the branch pipes 13, it can only be connected to one of the branch pipes 13, and the remaining branch channels 33 will not be connected to the branch pipes 13, and the remaining branch channels 33 will be blocked by the housing.

[0083] The branch channel 33 is provided with one or more than two; the branch pipe 13 is evenly provided with a plurality of them on the shell;

[0084] Preferably, 4 to 12 branch pipes 13 are arranged in the latitude direction of the shell, and more preferably 8 branch pipes;

[0085] Specifically, the number of branch pipes 13 arranged in the latitude direction of the shell is: 4, 5, 6, 7, 8, 9, 10, 11, 12.

[0086] More preferably, 2 to 8 branch pipes 13 are arranged in the meridian direction of the shell, and more preferably 4 branch pipes are arranged.

[0087] Specifically, the number of branch pipes 13 in the meridian direction of the shell is: 2, 3, 4, 5, 6, 7, 8.

[0088] refer to Figure 4 and Figure 5 In a specific embodiment, the number of branch channels 33 is an even number; preferably, the number of branch channels 33 is 2, 4, 6, 8, 10, or 12, and further preferably, the number of branch channels 33 is 4.

[0089] refer to Figure 4 and Figure 5In a specific embodiment, the number of branch channels 33 is an even number, and the even number of branch channels 33 are evenly arranged at the south latitude and north latitude of the valve body, and the two branch channels 33 located at the north latitude and south latitude are coaxially arranged. Therefore, the two coaxially arranged branch channels 33 are a structure that runs through the entire valve body. Further, when manufacturing the branch channels 33 on the valve body, the two branch channels 33 can be prepared at the same time by directly radially penetrating the valve body at the required position along the diameter of the valve body, so that the speed of manufacturing the branch channels 33 on the valve body is greatly improved, and the preparation and processing of the valve body are facilitated, and the processing cost of the valve body is reduced. Furthermore, the two branch channels 33 that run through the valve body make it more convenient to inspect and repair the valve body and the branch channels 33. When cleaning the branch channels 33, a flushing agent can be directly added to one of the branch channels 33 and discharged from the opposite branch channel 33. This makes it more convenient to clean and maintain the valve body and the branch channels 33.

[0090] refer to Figure 4 and Figure 5 In the present application, the branch pipe 13 on the shell is set to avoid relative positions when it is set. Since the branch channel 33 on the valve body is set to penetrate at a relative position, in order to make only one of the branch pipes 13 and the branch channel 33 connected. The branch pipe 13 is set symmetrically away from the position about the center of the shell. At the same time, the branch pipes 13 are set on different meridians. Specifically, the two branch pipes 13 on relative meridians have different corresponding latitudes. For example, the two branch pipes 13 on relative meridians need to be set at 45° south latitude and 30° north latitude, or at 30° south latitude and 45° north latitude, respectively. In this way, the branch pipe 13 avoids being in a symmetrical position relative to the center of the valve body, so that when the branch channel 33 is connected to the branch pipe 13, there is only one branch pipe 13 connected to the branch channel 33.

[0091] refer to Figure 4 and Figure 5 In a specific embodiment, the number of branch channels 33 is 4, and the opening ends of the four branch channels 33 are respectively located at 30°, 45° south latitude and 30°, 45° north latitude of the valve body.

[0092] refer to Figure 2 and Figure 3 The housing comprises an upper housing 1 and a lower housing 2, the main pipeline 11 is arranged on the upper housing 1, a motor 22 for driving the valve body to rotate is arranged on the lower housing 2, and a connecting hole for connecting the valve body and the motor 22 is opened on the lower housing 2; a housing sealing ring 12 is arranged between the upper housing 1 and the lower housing 2;

[0093] refer to Figure 2 and Figure 3The upper shell 1 and the lower shell 2 are both hemispherical structures, and the upper shell 1 and the lower shell 2 are detachably fixedly connected. Therefore, when processing and preparing the shell, the upper shell 1 and the lower shell 2 can be prepared separately; the upper shell 1 and the lower shell 2 are combined and installed into a spherical shell. The overall manufacturing difficulty of the spherical shell is reduced. At the same time, the upper shell 1 and the lower shell 2 are detachably connected, so that the valve body is more conveniently installed inside the shell.

[0094] refer to Figure 2 and Figure 3 The connecting hole is used to connect the motor 22 to the valve body, so that the motor 22 can drive the valve body to rotate in the housing.

[0095] The housing seal ring 12 is used to seal the interior of the housing to reduce the possibility of gas leakage in the housing.

[0096] refer to Figure 2 and Figure 3 , preferably, the electrode is a stepping motor 22;

[0097] The stepper motor 22 is driven to rotate by an electric pulse signal, so the stepper motor 22 will rotate a certain angle under an electric pulse signal, thereby driving the valve body to rotate in the housing. The stepper motor 22 is used to control the rotation of the valve body in the housing, and then the rotation angle of the valve body is controlled by controlling the electric pulse signal of the stepper motor 22, so that the branch channel 33 on the valve body can be connected with the preset branch pipeline 13.

[0098] Further preferably, the stepper motor 22 rotates at an angle of 10 to 12° each time.

[0099] Further preferably, the stepper motor 22 rotates at an angle of 11.5° each time.

[0100] Specifically, the angle of each rotation of the stepper motor 22 is: 10.1°, 10.2°, 10.3°, 10.4°, 10.5°, 10.6°, 10.7°, 10.8°, 10.9°, 11°, 11.1°, 11.2°, 11.3°, 11.4°, 11.5°, 11.6°, 11.7°, 11.8°, 11.9°, 12°.

[0101] refer to Figure 2 and Figure 3 , 8 branch pipes 13 are arranged in the latitude direction of the housing; 4 branch pipes 13 are arranged in the meridian direction of the housing. At this time, 32 branch pipes 13 are evenly arranged on the housing, so the angle between the latitudes where each branch pipe 13 is located is 11.5°. Then, each time the stepper motor 22 rotates 11.5°, the branch channel 33 on the valve body will be connected to the branch pipe 13 on the housing.

[0102] refer to Figure 2 and Figure 3 When the number of branch pipes 13 on the housing changes, it is necessary to control the rotation angle of the stepper motor 22 at the same time so that the stepper motor 22 can drive the branch channel 33 on the valve body to communicate with the branch pipe 13.

[0103] The valve body comprises an upper valve body 3 and a lower valve body 4 ; a main channel 31 is opened on the upper valve body 3 , and a driving hole connected to the motor 22 is opened on the lower valve body 4 ; a valve body sealing ring 32 is provided at the connection between the upper valve body 3 and the lower valve body 4 .

[0104] refer to Figure 2 and Figure 3 , the upper valve body 3 and the lower valve body 4 are both hemispherical. Due to the spherical structure of the valve body, it may be difficult to fix it during manufacturing and processing. Therefore, the valve body is set to a hemispherical structure of the upper valve body 3 and the lower valve body 4, thereby reducing the difficulty of processing the branch channel 33 and the main channel 31 on the valve body. At the same time, the split structure of the upper valve body 3 and the lower valve body 4 reduces its own weight, making it more convenient to install the valve body in the housing. The staff can more easily move the upper valve body 3 into the housing.

[0105] refer to Figure 3 and Figure 4 The valve body sealing ring 32 is used to connect the upper valve body 3 and the lower valve body 4 to reduce the possibility of gas leakage inside the valve body.

[0106] refer to Figure 1 A three-way valve 5 is arranged on the pipeline, and the three-way valve 5 is arranged in a target area corresponding to the pipeline.

[0107] refer to Figure 1 The collection pipeline includes a bus 52 and a sampling pump 53. The sampling pump 53 is connected to the bus 52. All pipelines are connected to the bus 52. A first flow controller 51 is provided on each pipeline.

[0108] refer to Figure 1 The three-way valve 5 is arranged in the sampling area of ​​the target area. The gas in the sampling area is taken through the three-way valve 5.

[0109] The two ends of the pipeline are connected to the sampling pump 53 and the bus 52 respectively, and the three-way valve 5 is arranged between the pipelines.

[0110] refer to Figure 1 The pipeline includes a first pipeline arranged between the three-way valve 5 and the bus 52 and a second pipeline arranged between the three-way valve 5 and the branch pipeline 13.

[0111] refer to Figure 1When sampling, the sampling pump 53 will continue to operate, thereby absorbing the gas in the sample area into the first pipeline, and the gas in the sample area will continue to circulate in the first pipeline.

[0112] refer to Figure 1 When the sample area needs to be monitored, the branch channel 33 corresponding to the sample area is connected to the branch pipe 13, and the sample gas in the first pipe will be extracted into the second pipe, and then pass through the second pipe and the branch pipe 13, the branch channel 33, enter the main channel 31 and the main pipe 11, and finally enter the monitor 6 for monitoring.

[0113] refer to Figure 1 , use the sampling book and the bus 52 to pump gas from all pipelines at the same time, and then pump all the gas in the target area into the first pipeline; at the same time, the sampling pump 53 continues to pump, so that the gas in the first pipeline is consistent with the gas in the sample area, thereby increasing the detection accuracy of the sample in the target area.

[0114] The flow rate on the pipeline is 5 to 20 L / min, preferably 10 L / min.

[0115] Specifically, the flow rate on the pipeline is 5L / min, 6L / min, 7L / min, 8L / min, 9L / min, 10L / min, 11L / min, 12L / min, 13L / min, 14L / min, 15L / min, 16L / min, 17L / min, 18L / min, 19L / min, and 20L / min.

[0116] refer to Figure 1 The first flow controller 51 is used to monitor the gas flow in the first pipeline, so that the gas in the first pipeline is in a circulation state, thereby making the gas in the first pipeline consistent with the gas in the sample area.

[0117] refer to Figure 1 A detection three-way valve 61 is provided between the collection device and the monitoring instrument 6 ; a detection pump 63 is connected to the detection three-way valve 61 , and a second flow controller 62 is provided between the detection pump 63 and the detection three-way valve 61 .

[0118] The flow rate at the three-way valve 61 is detected to be 0.5 to 5 L / min, preferably 1 L / min.

[0119] Specifically, the flow rate at the three-way valve 61 is detected as follows: 0.5L / min, 0.6L / min, 0.7L / min, 0.8L / min, 0.9L / min, 1L / min, 1.1L / min, 1.2L / min, 1.3L / min, 1.4L / min, 1.5L / min, 1.6L / min, 1.7L / min, 1.8L / min, 1.9L / min, 2L / min, 2.1L / min, 2.2L / min, 2.3L / min, 2.4L / min, 2.5L / min, 2.6L / min , 2.7L / min, 2.8L / min, 2.9L / min, 3L / min, 3.1L / min, 3.2L / min, 3.3L / min, 3.4L / min, 3.5L / min, 3.6L / min, 3.7L / min, 3.8L / mi n, 3.9L / min, 4L / min, 4.1L / min, 4.2L / min, 4.3L / min, 4.4L / min, 4.5L / min, 4.6L / min, 4.7L / min, 4.8L / min, 4.9L / min, 5L / min.

[0120] refer to Figure 1 The detection pump 63 is used to pump the sample gas at the first pipeline and the three-way valve 5. The detection pump 63 is continuously operated, and the sample gas at the three-way valve 5 is diverted to the second pipeline and pumped by the detection pump 63, and then the sample gas passes through the branch pipeline 13 and the main pipeline 11 and enters the detection pump 63. The three interfaces of the detection three-way valve 61 are connected to the main pipeline, the monitor 6 and the detection pump 63 respectively.

[0121] The sample gas enters the three-way valve 5 through the main pipeline 11, and then a small amount of sample gas is transported to the inside of the instrument for detection through the pump or pressure difference inside the monitor 6.

[0122] The present application also provides a method for multi-channel acquisition and online monitoring using the above system, which includes the following steps:

[0123] placing pipelines for circulating gas in the plurality of target areas;

[0124] The sampling end of the tubing is located in the target area;

[0125] The sampling ends obtain samples in respective target areas;

[0126] Controlling the sampling device to deliver the sample in the desired target area to the monitor;

[0127] The collection device is set up near the monitoring instrument.

[0128] The target area is sampled using a sampling device, and the obtained samples are transported to the sampling device through a pipeline; the sampling device then transports the samples to the monitor. Since the target area is sampled using a sampling device, the sampling device is set close to the monitor to reduce the distance between the sampling device and the monitor. This reduces the residue of multiple samples in multiple target areas collected by the sampling device between the sampling device and the monitor. This reduces the interference of residual gas on samples in the target area and improves the monitoring accuracy of the monitor on the target area.

[0129] The flow rate of the pipeline during sampling is 5 to 20 L / min, preferably 10 L / min.

[0130] Specifically, the flow rate of the sampling pipeline is 5L / min, 6L / min, 7L / min, 8L / min, 9L / min, 10L / min, 11L / min, 12L / min, 13L / min, 14L / min, 15L / min, 16L / min, 17L / min, 18L / min, 19L / min, and 20L / min.

[0131] The flow rate when the sample is transported to the monitor 6 is 0.5 to 5 L / min, preferably 1 L / min.

[0132] Specifically, the flow rate when delivering the sample value monitor 6 is: 0.5L / min, 0.6L / min, 0.7L / min, 0.8L / min, 0.9L / min, 1L / min, 1.1L / min, 1.2L / min, 1.3L / min, 1.4L / min, 1.5L / min, 1.6L / min, 1.7L / min, 1.8L / min, 1.9L / min, 2L / min, 2.1L / min, 2.2L / min, 2.3L / min, 2.4L / min, 2.5L / min, 2.6L / min n, 2.7L / min, 2.8L / min, 2.9L / min, 3L / min, 3.1L / min, 3.2L / min, 3.3L / min, 3.4L / min, 3.5L / min, 3.6L / min, 3.7L / min, 3.8L / mi n, 3.9L / min, 4L / min, 4.1L / min, 4.2L / min, 4.3L / min, 4.4L / min, 4.5L / min, 4.6L / min, 4.7L / min, 4.8L / min, 4.9L / min, 5L / min.

[0133] A three-way valve 5 is provided at the sampling end of the pipeline; all pipelines are connected to the bus 52 .

[0134] The pipelines are connected by a bus bar, so that the pipelines can circulate the gas in the target area at the same time, and the gas in the target area circulates in the pipeline so that the gas in the pipeline is consistent with the gas in the target area. When a gas leak occurs in the target area, the leaked gas can be sucked into the pipeline at the first time, and then the collection device can collect samples containing the leaked gas from the pipeline, so that the samples have higher timeliness.

[0135] The three-way valve 5 is respectively connected to the sampling pump 53 for circulating gas, the target area, and the collection device, so that the pipeline can simultaneously circulate gas to the target area and sample the target area by the collection device.

[0136] In summary, reference Figure 1 This figure shows the overall structure of the multi-channel acquisition and online monitoring system. The three-way valve 5 is connected to the pipeline, and the three-way valve 5 is set in the target area. The three-way valve 5 is used to take samples; and then the sampled gas in the pipeline is transported to the monitor 6 for real-time detection through the acquisition device.

[0137] One end of the pipeline is connected to the bus 52, and the bus 52 is connected to the sampling pump. The sampling pump is used to absorb the gas in the target area into the pipeline. At the same time, the first flow controller 51 controls the flow rate on the pipeline to 10L / min, so that the flow rates on each pipeline are equal, so that the sample in the target area can be quickly collected. At the same time, all pipelines are connected through the bus 52, and all pipelines can be sampled using one sampling pump.

[0138] refer to Figure 2 This figure shows the explosion structure of the collection device. The shell is a spherical or quasi-spherical structure, and is composed of an upper shell 1 and a lower shell 2. The upper shell 1 and the lower shell 2 are connected by bolts, and a shell sealing ring 12 is used to seal between the upper shell 1 and the lower shell 2 to reduce the possibility of gas leakage inside the shell.

[0139] The shell is a hollow structure, the valve body is arranged inside the shell, and the inner surface of the shell is adapted to the outer surface of the valve body, so that after the valve body is placed inside the shell, the valve body can rotate inside the shell, and at the same time, the main channel 31 and the branch channel 41 on the valve body can be connected to the main pipe 11 and the branch pipe 21 on the shell.

[0140] The valve body is composed of an upper valve body 3 and a lower valve body 4, and a valve body sealing ring 32 is arranged between the upper valve body 3 and the lower valve body 4 for connection, so that the upper valve body 3 and the lower valve body 4 are kept sealed.

[0141] The shell and the valve body are both arranged into an upper and lower two-part structure, so that when the shell and the valve body fail, the shell and the valve body can be disassembled and then tested, making the inspection of the shell and the valve body more convenient, and making the failure detection and maintenance of the shell and the valve body easier.

[0142] refer to Figure 3 , this figure is a cross-sectional view of the collection device, from which it can be seen that the valve body is located inside the shell, and the outer surface of the valve body fits the inner surface of the shell, so that the valve body and the shell are sealed. The branch channel 41 in the valve body is a through hole that runs through the entire valve body. When the valve body rotates, the branch channel 41 can communicate with the corresponding branch pipes 21 on the upper shell 1 and the lower shell 2.

[0143] The output shaft of the motor 22 passes through the lower housing 2 and is connected to the connecting hole of the lower valve body 4, so that the motor 22 can drive the valve body to rotate inside the housing.

[0144] When the motor 22 drives the valve body to rotate, the outlet end of the branch channel 41 rotates within the same latitude range of the valve body, while the branch pipes 21 are arranged within different latitude ranges of the housing, so the number of branch channels 41 is equal to the number of branch pipes 21 in the meridian direction. Therefore, when the valve body rotates inside the housing, the main pipe 11 can be connected with each branch pipe 21.

[0145] The two branch channels 41 opposite to the upper valve body 3 and the lower valve body 4 are coaxially arranged. Therefore, when manufacturing the branch channels 41, the two branch channels 41 can penetrate the valve body, which facilitates the manufacturing of the branch channels 41 on the one hand and makes the inspection of the branch channels 41 more convenient on the other hand.

[0146] refer to Figure 4 This figure is an exploded view of the valve body and also Figure 3 A partial enlarged view of the valve body structure. The upper valve body 3 is provided with a main channel 31 and a branch channel 33, and the lower valve body 4 is provided with a branch channel 33. A connecting hole connected to the stepper motor 22 is provided at the end of the lower valve body 4. The driving shaft of the stepper motor 22 is fixedly connected to the valve body through the connecting hole, and the stepper motor 22 drives the valve body to rotate. Then, the branch channel 33 on the valve body is connected to the branch pipe 13 on the shell.

[0147] refer to Figure 5This figure is a cross-sectional view of the internal structure of the valve body. It can be seen from the figure that the main channel 31 is opened from the outer surface of the valve body to the spherical center of the valve body. There are four branch channels 33, and the four branch channels 33 are coaxially arranged on the upper valve body 3 and the lower valve body 4, so that the two branch channels 33 penetrate the valve body. And all the branch channels 33 are connected to the main pipeline 11 at the position of the spherical center. Therefore, when the gas enters the branch channel 33 through the branch pipeline 13, it can enter the main channel 31. Then it is sent to the monitor 6 for monitoring.

[0148] During the entire monitoring process, the sampling pump 53 and the detection pump 63 are continuously extracting sample gas. Most of the sample gas is discharged from the sample area through the three-way valve 5, the first flow controller 51, the bus 52, and the sampling pump 53. Under the action of the detection pump 63, a part of the sample gas is diverted from the three-way valve 5 and enters the branch pipe 13. Through the switching of the valve body, it enters the main pipe 11 and the detection three-way valve 61. Most of this part of the sample gas is discharged through the second flow controller 62 and the detection pump 63, and a small part of the sample gas is extracted into the monitor 6 (such as PTR-TOF) through the pressure difference or pump inside the monitor 6 for detection.

[0149] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A multi-channel acquisition and online monitoring system, wherein: The system comprises a collection device, a sampling pipeline and a monitor, wherein the sampling pipeline is arranged in a target area to collect gas in the target area, and the collection device is connected between the sampling pipeline and the monitor; The sampling pipeline includes a plurality of pipelines respectively arranged in each target area; all pipelines are connected to the collection device.

2. The system according to claim 1, wherein: The collection device comprises a shell, on which a main pipeline and a branch pipeline are arranged; the main pipeline is communicated with the monitoring instrument, and the branch pipeline is communicated with the pipeline.

3. The system according to claim 2, wherein: The collecting device comprises a valve body, which is arranged inside the shell and can control the connection and disconnection of the branch pipeline and the main pipeline.

4. The system according to claim 3, wherein: The valve body is rotatably connected to the housing, and the valve body can rotate inside the housing.

5. The system according to claim 3 or 4, wherein: The valve body is provided with a main channel and a branch channel, the branch channel is communicated with the main channel; the main channel is communicated with the main pipeline, and the branch channel can be communicated with the branch pipeline as the valve body rotates.

6. The system according to claim 3 or 4, wherein: The branch channel is provided with one or more than two; the branch pipe is evenly provided with a plurality of branch pipes on the shell; Preferably, 4 to 12 branch pipes are arranged in the latitude direction of the shell, and more preferably 8 branch pipes are arranged; Further preferably, 2 to 8 branch pipes are arranged in the meridian direction of the shell, and further preferably 4 branch pipes are arranged.

7. The system according to claim 3 or 4, wherein: The housing comprises an upper housing and a lower housing, the main pipeline is arranged on the upper housing, a motor for driving the valve body to rotate is arranged on the lower housing, and a connecting hole for connecting the valve body and the motor is opened on the lower housing; a housing sealing ring is arranged between the upper housing and the lower housing; Preferably, the electrode is a stepper motor; Further preferably, the rotation angle of the stepper motor each time is 10 to 12°; Further preferably, the stepper motor rotates at an angle of 11.5° each time.

8. The system according to claim 3 or 4, wherein: The valve body comprises an upper valve body and a lower valve body; the main channel is opened on the upper valve body, and a driving hole connected to the motor is opened on the lower valve body; a valve body sealing ring is arranged at the connection between the upper valve body and the lower valve body.

9. The system according to claim 1, wherein: A three-way valve is arranged on the pipeline, and the three-way valve is arranged in a target area corresponding to the pipeline.

10. A method for multi-channel acquisition and online monitoring using the system according to any one of claims 1 to 9, wherein: The following steps are involved: placing pipelines for circulating gas in the plurality of target areas; The sampling end of the tubing is located in the target area; The sampling ends obtain samples in respective target areas; Controlling the sampling device to deliver the sample in the desired target area to the monitor; The collection device is set up near the monitoring instrument.

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