Multi-point synchronous sampling and online gas analysis system

Abstract

The invention discloses a multi-point synchronous sampling and on-line type gas analysis system which comprises a steady-state gas supply module, a multi-gas-path gas supply module, a plurality of open type breathing chambers and an active synchronous sampling module, one end of the steady-state gas supply module is used for collecting gas, and the other end of the steady-state gas supply module is used for collecting gas; the other end of the steady-state gas supply module is connected with the input end of the multi-gas-path gas supply module; a plurality of output ends of the multi-gas-path gas supply module are correspondingly connected with the input end of the active synchronous sampling module through the corresponding open type breathing chambers respectively; the active synchronous sampling module is used for carrying out flow regulation and sampling on the received gas, and the output end of the active synchronous sampling module is connected with the gas analyzer; and the gas analyzer is used for analyzing and displaying the received gas. By implementing full-automatic multi-point synchronous sampling, the problem of inaccurate measurement caused by soil temperature change is effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbon flux monitoring and community photosynthesis monitoring, and specifically relates to a multi-point synchronous sampling and online gas analysis system, which can also be used in the fields of industrial and environmental monitoring. Background Art

[0002] Since the Industrial Revolution, greenhouse gas emissions caused by human activities have significantly impacted global climate, ecological security, and socioeconomic development. Clarifying and quantifying global greenhouse gas emissions and uptake by land and water is a fundamental and core scientific issue in the global carbon, nitrogen, and water cycles. The continuous development of high-precision greenhouse gas detection equipment has led to a growing demand for multi-component monitoring of soil and water respiration.

[0003] Traditional soil and water respiration measurements usually involve multiple respiration chambers sharing a high-precision greenhouse gas analyzer for point-by-point respiration measurements. Because the soil respiration measurement cycle is long, the soil temperature changes greatly during the measurement process due to factors such as solar radiation, which seriously affects the accuracy of soil respiration measurements. This leads to large errors in soil respiration measurements and makes effective comparative analysis difficult during processing. Summary of the Invention

[0004] To address the drawbacks of existing multi-point gas flux and community photosynthesis measurement systems, which suffer from significant variations in soil temperature at different locations during the same soil respiration measurement, or inaccurate measurement results due to differences in solar radiation, the present invention proposes a multi-point synchronous sampling and online gas analysis system. By implementing simultaneous, synchronous, and multi-point sampling, this system fundamentally addresses the issues of time asynchrony and poor test data quality associated with traditional multi-point soil respiration measurements. The technical solutions employed by the present invention are as follows:

[0005] A multi-point synchronous sampling and online gas analysis system includes a steady-state gas supply module, a multi-gas-path gas supply module, several open breathing chambers and an active synchronous sampling module. One end of the steady-state gas supply module is used to collect gas, and the other end of the steady-state gas supply module is connected to the input end of the multi-gas-path gas supply module; several output ends of the multi-gas-path gas supply module are respectively connected to the input end of the active synchronous sampling module through corresponding open breathing chambers; the active synchronous sampling module is used to regulate the flow, clean the gas path and sample the received gas, and the output end of the active synchronous sampling module is connected to a gas analyzer; the gas analyzer is used to analyze and display the received gas.

[0006] The steady-state gas supply module includes a compressor, at least two parallel gas collection components and a first valve. The input end of the compressor is used to extract gas, the output end of the compressor is connected to the input end of each gas collection component, and the output end of each gas collection component is connected to the multi-gas supply module through the first valve.

[0007] Each gas collection assembly includes a solenoid valve, a gas storage and a pressure reducing valve. One end of the solenoid valve is connected to the output end of the compressor, and the other end of the solenoid valve is connected to the gas storage; the gas storage is used to store compressed gas, and the gas storage is connected to the first valve through the pressure reducing valve.

[0008] Optionally, the steady-state gas supply module includes an air pump, at least two parallel gas collection modules, a first valve and an air supply pump. The input end of the air pump is used to extract gas, and the output end of the air pump is connected to the input end of each gas collection module. The output end of each gas collection module is connected to the input end of the air supply pump through the first valve, and the output end of the air supply pump is connected to the multi-gas supply module.

[0009] The multi-gas supply module includes a first bus and several passage gas supply components. The input end of the first bus is connected to the steady-state gas supply module, and the several output ends of the first bus are respectively connected to the corresponding open breathing chambers through corresponding passage gas supply components.

[0010] Each passage air supply component includes a first filter and a first mass flow controller. The input end of the first filter is correspondingly connected to the output end of the first bus, and the output end of the first filter is connected to the input end of the first mass flow controller; the output end of the first mass flow controller is connected to the corresponding open breathing chamber.

[0011] The active synchronous sampling module includes a second bus and several channel gas path switching components, the input end of each channel gas path switching component is correspondingly connected to the output end of several open breathing chambers, and the output end of the channel gas path switching component is correspondingly connected to the input end of the second bus; the output end of the second bus is connected to the gas analyzer through a third filter.

[0012] It also includes an exhaust component, which includes a second air pump and a third bus. The input end of the third bus is correspondingly connected to the output end of the channel gas path switching component, and the output end of the third bus exhausts gas through the second air pump.

[0013] Each channel gas path switching assembly includes a second filter, a second mass flow controller, a first air pump, a second valve and a sampling bag connected in sequence. The input end of the second filter is correspondingly connected to the output end of the open breathing chamber, and the output end of the sampling bag is correspondingly connected to several input ends of the second bus.

[0014] It also includes a calibration module, which includes a fourth bus, one end of which is connected to the multi-gas supply module, and the other end of the fourth bus is connected to the gas analyzer through a third filter; the fourth bus is also provided with at least one standard gas interface for connecting to a standard gas supply source.

[0015] Beneficial effects of the present invention:

[0016] 1. It can be used in application scenarios such as multi-point soil respiration, multi-point community photosynthesis, multi-point water surface respiration, atmospheric profiles, and soil profiles. It provides a new solution for high-precision research on various interface fluxes (soil and water) and profiles (aboveground and belowground) under the "dual carbon" background, and provides a unique steady-state test method for monitoring, scientific experiments, and research on carbon budgets at the land and water interfaces.

[0017] 2. It provides a new approach for sampling different sampling points at the same time, or for grouping the same sampling points simultaneously. By implementing fully automatic multi-point synchronous sampling, it effectively avoids the problem of inaccurate measurements caused by soil temperature changes, better serves carbon monitoring, and effectively improves the accuracy and reliability of monitoring results.

[0018] 3. It solves the problem of long single measurement cycle, large ambient temperature fluctuation and poor data comparability caused by the need for multiple respiration chambers to circulate and share a single gas analyzer for sequential point-by-point monitoring. At the same time, it provides a set of accurate soil respiration and community photosynthesis measurement systems that can be used online for a long time, providing high-precision continuous sampling and measurement tools for carbon monitoring, which are synchronous, automatic, with no limit on the number of channels and can be used online for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 Schematic diagram of the module structure of the present invention;

[0022] In the figure, 1 is a steady-state gas supply module, 11 is a compressor, 12 is a solenoid valve, 13 is a gas storage, 14 is a pressure reducing valve, 15 is a first valve, 2 is a multi-gas supply module, 21 is a first bus, 22 is a first filter, 23 is a first mass flow controller, 3 is an open breathing chamber, 4 is an active synchronous sampling module, 41 is a second filter, 42 is a second mass flow controller, 43 is a first air pump, 44 is a second valve, 45 is a sampling bag, 46 is a second bus, 47 is a third bus, 48 ​​is a second air pump, 5 is a gas analyzer, 6 is a third filter, 7 is a calibration module, 71 is a fourth bus, and 72 is a standard gas supply source. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0024] A multi-point synchronous sampling and online gas analysis system, such as Figure 1 and Figure 2 As shown, the system comprises a steady-state gas supply module 1, a multi-gas supply module 2, several open respiration chambers 3, and an active synchronous sampling module 4. One end of the steady-state gas supply module 1 is used to collect steady-state gas. Steady-state refers to the fact that the proportions or concentrations of the various gas components remain essentially unchanged, facilitating subsequent demand analysis of the soil respiration gas to be tested using this steady-state gas as a benchmark, thereby understanding the carbon cycle process and soil health of the soil ecosystem. The other end of the steady-state gas supply module 1 is connected to the input end of the multi-gas supply module 2. The multi-gas supply module 2 is used to regulate and control the flow of the received steady-state gas. The multiple output ends of the multi-gas supply module 2 are connected one-to-one to the air inlets of the several open respiration chambers 3. The air outlet of each open respiration chamber 3 is respectively connected to the input end of the active synchronous sampling module 4. The active synchronous sampling module 4 is used to regulate and control the flow of the received gas and to sample it. The output end of the active synchronous sampling module 4 is connected to a gas analyzer 5 through a third filter 6. The gas analyzer 5 may be a gas concentration analyzer or an isotope analyzer.

[0025] The open respiration chamber 3 can be a soil respiration chamber or a water respiration chamber, used to collect respired gases from the soil or water at the point to be detected. It is also provided with at least three ports: an air inlet, an overflow port, and an air outlet. The overflow port is designed to prevent excessive pressure in the respiration chamber, thus providing both pressure stabilization and overflow functions. In this embodiment, the respiration chamber is a soil respiration chamber. The soil respiration chamber has a narrow air inlet and outlet, with a thicker center, which facilitates gas collection. The small air inlet and outlet ensure gas stability. Other types of soil respiration chambers are also possible.

[0026] The steady-state gas supply module 1 includes a compressor 11 and at least two gas collection components connected in parallel. The input end of the compressor 11 is used to extract gas, preferably steady-state gas. The compressor 11 compresses the steady-state gas. The output end of the compressor 11 is correspondingly connected to the input end of each gas collection component. The output end of the gas collection component is connected to the input end of the multi-gas supply module 2 through the first valve 15. In this embodiment, the gas collection component is two-way, and the two gas collection components are arranged in parallel. One path can be used to collect gas, and the other path can be used as a gas source for the subsequent gas path. The two paths work alternately to provide a stable gas source for the entire system. The first valve 15 is set as a three-way valve. By adjusting the opening of the pressure reducing valve and the switch on the three-way valve, the steady-state gas collected by the corresponding gas collection component can be adjusted as a gas supply source.

[0027] Each gas collection assembly includes a solenoid valve 12, a gas storage 13, and a pressure reducing valve 14, all connected in sequence. The gas storage 13 is a hollow structure used to store gas compressed by the compressor 11. The gas storage 13 can be a gas cylinder or a gas storage bag, and has three operating states: filling, resting, and supplying. The solenoid valve 12 controls the flow of gas between the compressor 11 and the gas storage 13 in the corresponding gas path, while the pressure reducing valve 14 regulates the gas path pressure. Specifically, the gas compressed by the compressor 11 is inflated into the gas storage 13 through the opened solenoid valve 12. The gas storage 13 is in an inflated state. Sufficient gas can ensure a stable gas source supply during the monitoring process, and avoid the unstable gas supply affecting the monitoring results. When the gas and pressure in the gas storage 13 reach stability, the solenoid valve 12 is closed, and the gas storage is in a static state. By setting the static state, the gas in the gas storage can be effectively mixed to improve the measurement accuracy. Finally, the gas in the gas storage is stably output to the multi-gas supply module 2 through the pressure reducing valve 14 and the first valve 15 in turn. At this time, the gas storage is in a gas supply state. By setting the gas supply state, the continuity and accuracy of subsequent measurements can be ensured.

[0028] Optionally, a water vapor adding device is provided between the first valve 15 and the first bus 21 for humidifying the gas, including but not limited to various existing humidification methods such as a semipermeable membrane.

[0029] Optionally, the steady-state gas supply module 1 may also include an air pump, at least two gas collection modules connected in parallel, a first valve 15 and an air supply pump. The input end of the air pump is used to extract gas, and the output end of the air pump is connected to the input end of each gas collection module. The output end of each gas collection module is connected to the input end of the air supply pump through the first valve 15, and the output end of the air supply pump is connected to the multi-gas supply module 2. Each gas collection module includes a solenoid valve 12 and a gas storage 13. The input end of the solenoid valve 12 is connected to the output end of the air pump. The output end of the solenoid valve 12 is used to inflate the gas storage 13. The gas storage 13 can still be set as a gas storage bottle or as a gas storage bag. At the same time, the gas storage 13 also has three working states, namely, inflation, static and gas supply. The air pump is used to provide pressure for the system to ensure that the extracted gas enters the corresponding gas storage through the open solenoid valve. The air supply pump is used to adjust and control the gas path. Specifically, the gas extracted by the inflation pump is inflated into the gas storage 13. After the gas in the gas storage is stabilized, the gas is transported to the multi-gas supply module through the first valve and the gas supply pump in sequence.

[0030] The multi-path gas supply module 2 includes a first bus 21 and several passage gas supply assemblies. The input end of the first bus 21 is connected to the output end of the first valve 15. The first valve 15 can control which gas storage 13 supplies gas to the subsequent gas path. The output end of the first bus 21 is provided with multiple outlet pipelines. The input end of each passage gas supply assembly is connected to a corresponding outlet pipeline. The steady-state gas in the gas storage can be transmitted to the corresponding open respiration chamber 3 through the outlet pipeline on the first bus and the corresponding passage gas supply assembly. The steady-state gas is mixed with the soil respiration gas to be detected in the open respiration chamber 3. The mixed gas is transmitted to the active synchronous sampling module 4 through the outlet end of the open respiration chamber 3. The specifications of the first bus can be specifically set according to the number of outlet pipelines. In addition, a multi-path air inlet valve group can also be used to replace the first bus to achieve gas transmission and control. The specific control method is the existing technology. Each passage air supply assembly includes a first filter 22 and a first mass flow controller 23. The input end of the first filter 22 is correspondingly connected to the outlet pipeline of the first bus 21, and the output end of the first filter 22 is paired and connected to the air inlet end of the open breathing chamber 3 through the first mass flow controller 23 and the trachea. The number of open breathing chambers 3 is consistent with the number of passage air supply assemblies, and the corresponding passage air supply assemblies filter and adjust the flow of the corresponding steady-state gas entering the open breathing chamber 3. The first filter can filter out impurities and particulate matter in the gas. The first mass flow controller monitors the gas flow flowing through the pipeline to ensure the stability of the gas transmission process.

[0031] The active synchronous sampling module 4 includes several channel gas switching assemblies and a second bus 46. The second bus 46 is provided with multiple inlet pipes and at least one outlet pipe. Each channel gas switching assembly includes a second filter 41, a second mass flow controller 42, a first air pump 43, a second valve 44, and a sampling bag 45, which are connected in sequence. The input end of each second filter 41 on each channel gas switching assembly is respectively paired with the outlet end of the open breathing chamber 3, so that the mixed gas in the open breathing chamber 3 is sequentially transmitted through the second filter 41, the second mass flow controller 42, the first air pump 43, and the second valve 44 to the sampling bag 45, which can store the received mixed gas. The end of the sampling bag 45 away from the second valve 44 is connected to the inlet pipe of the second bus 46. The multiple inlet pipes of the second bus 46 are each provided with a solenoid valve. When the sampling bag 45 is in the sampling state or another sampling bag 45 is in the gas analysis state, the corresponding solenoid valve can be closed. The output end of the second bus 46 is connected to the gas analyzer 6 through the third filter 5, so that the mixed gas in the sampling bag 45 in the gas analysis state is transmitted to the gas analyzer 6 through the second bus 46 and the third filter 5, and then the components of the mixed gas in each sampling bag 45 are analyzed respectively by the gas analyzer 6. The number of inlet pipes of the second bus 46 is consistent with the number of channel gas supply components, that is, the number of channel gas supply components is also consistent with the number of channel gas path switching components. In specific applications, it can be set to 8, 16, 24, 32, 36, etc., which can be selected according to actual needs. Specifically, the second filter 41 further filters the received mixed gas, and the second mass flow controller 42 regulates the inflowing gas flow, which improves the accuracy and reliability of the system measurement results and ensures the continuity and stability of the gas path. The first air pump 43 is a sampling pump, which is used to transmit the mixed gas in the gas path to the sampling bag 45. In this embodiment, the second valve can be a two-position three-way solenoid valve, which is provided with an inlet port and two outlet ports. The inlet port is connected to the output end of the sampling pump, one outlet port is connected to the sampling bag, and the other outlet port is an emptying end, which is used to open when clearing the air path gas before sampling the sampling bag.

[0032] Preferably, an exhaust assembly is provided between the sampling bag 45 and the second bus 46. The exhaust assembly includes a second air pump 48 and a third bus 47. The number of inlet pipes of the third bus 47 is consistent with the number of channel gas path switching assemblies. Each inlet pipe of the third bus 47 is connected in a one-to-one correspondence with the end of the sampling bag 45 away from the second valve 44. The outlet pipe of the third bus 47 is connected to the input end of the second air pump 48. The output end of the second air pump 48 is used to exhaust gas. The exhaust assembly, channel gas path switching assembly, second bus, and gas analyzer cooperate to achieve tasks such as gas path flushing, air bag sampling, and emptying the sample bag after sample analysis. In this embodiment, the second air pump 48 is a vacuum pump for exhausting gas from the gas path. The second bus 46 and the third bus 47 can also be replaced by a multi-way exhaust valve group. The first bus, the second bus, the third bus and the fourth bus are all gas buses, which are a device for centrally controlling gas distribution. This is the prior art. In addition, the control devices such as valves and buses involved in this application can be controlled by a PLC or a single-chip microcomputer to realize the automation of gas path control and system analysis.

[0033] Preferably, a calibration module 7 is further provided between the multi-gas supply module 2 and the active synchronous sampling module 4, and the calibration module 7 includes a fourth bus 71, one end of the fourth bus 71 is connected to the first bus 21, the other end of the fourth bus 71 is connected to the input end of the third filter 5, the fourth bus 71 is also connected to the output end of the second bus 46, and at least one standard gas interface is also provided on the fourth bus 71. In this embodiment, the number of standard gas interfaces is 3, and the fourth bus 71 is provided with five inlet pipelines, each inlet pipeline is provided with a solenoid valve, and one inlet pipeline is connected to the first bus 21 to facilitate the gas analyzer to analyze the steady-state gas components. When the gas analyzer analyzes the steady-state gas components, the other inlet pipelines are in a closed state; three inlet pipelines are used as standard gas interfaces, and the standard gas interfaces are used to connect to the standard gas supply source 72 to perform regular or irregular calibration of the gas analyzer to ensure the accuracy of the measurement results. When the gas analyzer is calibrated, the other inlet pipelines are in a closed state; one inlet pipeline is connected to the output end of the second bus 46 to enable the gas analyzer to analyze the mixed gas. When the gas analyzer analyzes the mixed gas components, the other inlet pipelines are in a closed state to avoid mutual influence between channels.

[0034] The method of using the present application is as follows: first, use a compressor to extract steady-state gas and store it in a gas storage. Then, select any one of the gas storages in a static state, close the solenoid valve of the line, open the pressure reducing valve of the line and the corresponding port of the first valve, and the steady-state gas is transmitted to the inlet pipeline of the first bus. The gas analyzer is used to analyze and record the components of the steady-state gas; then, open the valves on each outlet pipeline of the first bus to transmit the steady-state gas in the gas storage to the open breathing chamber. The steady-state gas is mixed with the breathing gas to be detected in the open breathing chamber. The mixed gas passes through the second filter, the second mass The gas mixture is sampled and stored by the sampling bag through the flow controller, the first air pump and the second valve. The sampling bag samples and stores the received mixed gas. Multiple sampling bags can sample the corresponding mixed gas synchronously. After the sampling is completed, each mixed gas can be analyzed separately. The corresponding switch on the inlet pipe of the second bus is turned on to allow the mixed gas in the sampling bag to pass through the inlet pipe of the second bus, the outlet pipe of the second bus and the third filter to be transmitted to the gas analyzer for detection and analysis. The gas analyzer can obtain the composition of the respiratory gas based on the steady-state gas composition and the mixed gas composition that have been detected.

[0035] Preferably, after completing the analysis of one mixed gas, the exhaust component can be used to perform a gas emptying operation on the gas path after the sampling bag to avoid affecting the analysis operation of the next mixed gas; in addition, before sampling and storing the mixed gas, the second valve can be used to clean the gas path, and then the corresponding port can be closed after cleaning. The multi-channel gas path setting of the present application can synchronously sample soil respiratory gases at multiple detection locations. After sampling, the gas in the sampling bag that has been sampled can be sequentially extracted and analyzed. For example, after the analysis of the gas in the sampling bag of the first path gas supply component is completed, the second path is directly cut into to analyze the gas in the sampling bag, and the exhaust component is started to empty the gas in the sampling bag of the first path, and so on. The setting of the mass flow controller, sampling bag, gas storage, etc. can accurately control the gas path flow and pressure, ensure the stable supply and discharge of gas in the analysis system, prevent cross-contamination of different gases while ensuring measurement accuracy, adapt to different measurement needs, and effectively improve work efficiency.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-point synchronous sampling and online gas analysis system, characterized in that: The invention comprises a steady-state gas supply module (1), a multi-gas supply module (2), a plurality of open breathing chambers (3) and an active synchronous sampling module (4); one end of the steady-state gas supply module (1) is used for collecting gas, and the other end of the steady-state gas supply module (1) is connected to the input end of the multi-gas supply module (2); the plurality of output ends of the multi-gas supply module (2) are respectively connected to the input end of the active synchronous sampling module (4) through the corresponding open breathing chambers (3); the active synchronous sampling module (4) is used for respectively regulating the flow rate and sampling the received gas; the output end of the active synchronous sampling module (4) is connected to a gas analyzer (6); and the gas analyzer (6) is used for respectively analyzing the received gas.

2. The analysis system according to claim 1, characterized in that The steady-state gas supply module (1) comprises a compressor (11), at least two gas collection assemblies connected in parallel, and a first valve (15); the input end of the compressor (11) is used to extract gas; the output end of the compressor (11) is connected to the input end of each gas collection assembly; and the output end of each gas collection assembly is connected to the multi-gas supply module (2) via the first valve (15).

3. The analysis system according to claim 2, characterized in that Each gas collection assembly comprises a solenoid valve (12), a gas storage (13) and a pressure reducing valve (14). One end of the solenoid valve (12) of each path is connected to the output end of the compressor (11), and the other end of the solenoid valve (12) is communicated with the corresponding gas storage (13). The gas storage (13) is used to store compressed gas, and the gas storage (13) is communicated with the first valve (15) through the pressure reducing valve (14).

4. The analysis system according to claim 1, wherein The steady-state gas supply module (1) comprises an air pump, at least two gas collection modules connected in parallel, a first valve (15) and an air supply pump. The input end of the air pump is used to extract gas, the output end of the air pump is connected to the input end of each gas collection module, the output end of each gas collection module is connected to the input end of the air supply pump via the first valve (15), and the output end of the air supply pump is connected to the multi-gas supply module (2).

5. The analysis system according to claim 1, characterized in that The multi-gas supply module (2) comprises a first bus (21) and a plurality of gas supply components, wherein the input end of the first bus (21) is connected to the output end of the steady-state gas supply module (1), and the plurality of output ends of the first bus (21) are connected to corresponding open breathing chambers (3) through corresponding gas supply components.

6. The analysis system according to claim 5, characterized in that Each passage air supply assembly includes a first filter (22) and a first mass flow controller (23), wherein the input end of the first filter (22) is connected to the output end of the first bus (21), and the output end of the first filter (22) is connected to the input end of the corresponding first mass flow controller (23); and the output end of the first mass flow controller (23) is connected to the corresponding open breathing chamber (3).

7. The analysis system according to claim 1, wherein The active synchronous sampling module (4) includes a second bus (46) and a plurality of channel gas path switching components, wherein the input end of each channel gas path switching component is correspondingly connected to the output end of a plurality of open breathing chambers (3), and the output end of the channel gas path switching component is correspondingly connected to the input end of the second bus (46); the output end of the second bus (46) is connected to the gas analyzer (6) through a third filter (5).

8. The analysis system according to claim 7, characterized in that The invention also includes an exhaust component, which includes a second air pump (48) and a third bus (47), wherein the input end of the third bus (47) is correspondingly connected to the output end of the channel gas path switching component, and the output end of the third bus (47) discharges gas through the second air pump (48).

9. The analysis system according to claim 8, characterized in that Each channel gas path switching assembly includes a second filter (41), a second mass flow controller (42), a first air pump (43), a second valve (44) and a sampling bag (45) connected in sequence, the input end of the second filter (41) is correspondingly connected to the output end of the open breathing chamber (3), and the output end of the sampling bag (45) is correspondingly connected to several input ends of the second bus (46).

10. The analysis system according to claim 1, wherein The device further comprises a calibration module (7), wherein the calibration module (7) comprises a fourth bus (71), one end of the fourth bus (71) being connected to the multi-gas supply module (2), and the other end of the fourth bus (71) being connected to the gas analyzer (6) via a third filter (5); and the fourth bus (71) is also provided with at least one standard gas interface for connecting to a standard gas supply source (72).

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