A multi-probe continuous online carbon dioxide measurement system

Abstract

This invention provides a multi-probe continuous online carbon dioxide measurement system, comprising a CO2 multi-point sampling subsystem, a probe external backflushing subsystem, a flue gas pretreatment subsystem, and a CO2 measurement subsystem. The CO2 multi-point sampling subsystem includes multiple sampling probes and an on-site mixing chamber. The probe external backflushing subsystem includes an external backflushing compressed air pipeline and a first oil-water separator installed on the external backflushing compressed air pipeline. The flue gas pretreatment subsystem includes a primary condenser, a precision filter, and a secondary condenser installed in a cabinet. The CO2 measurement subsystem includes a CO2 gas analyzer installed in a cabinet, and the CO2 gas analyzer is connected to the sample gas pipeline. The multi-probe continuous online carbon dioxide measurement system provided by this invention can adapt to large flue gas ducts and uneven CO2 concentration distribution conditions, achieving accurate monitoring of CO2 emission concentration.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide emission monitoring technology, and in particular to a multi-probe continuous online carbon dioxide measurement system. Background Technology

[0002] Industrial flue gas carbon dioxide emissions are typically monitored using a single-probe continuous online measurement system. However, in large flue gas ducts or under conditions of uneven flue gas concentration distribution, the selection of the single-probe location can lead to differences in on-site carbon dioxide concentration monitoring, affecting the accuracy of carbon dioxide concentration measurement and consequently the accuracy of carbon emission accounting.

[0003] To address the aforementioned problems, this invention provides a multi-probe continuous online carbon dioxide measurement system capable of accurate measurement in large flues and when CO2 concentration distribution is uneven. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-probe continuous online carbon dioxide measurement system that can solve the problem of low measurement accuracy of existing single-probe continuous online measurement systems in large flues and where CO2 concentration distribution is uneven.

[0005] This invention provides a multi-probe continuous online carbon dioxide measurement system, comprising:

[0006] The CO2 multi-point sampling subsystem includes multiple sampling probes and an on-site mixing box. Each sampling probe is installed in the flue and connected to the on-site mixing box. The on-site mixing box is connected to the first end of the sample gas pipeline.

[0007] The probe external backflush subsystem includes an external backflush compressed air pipeline and a first oil-water separator installed on the external backflush compressed air pipeline. One end of the external backflush compressed air pipeline is connected to a first compressed air source, and each of the sampling probes is connected to the other end of the external backflush compressed air pipeline.

[0008] The flue gas pretreatment subsystem includes a primary condenser, a precision filter, and a secondary condenser installed in a cabinet, wherein the primary condenser, the precision filter, and the secondary condenser are sequentially installed on the sample gas pipeline;

[0009] The CO2 measurement subsystem includes a CO2 gas analyzer installed in the cabinet, which is connected to the other end of the sample gas pipeline.

[0010] The multi-probe continuous online carbon dioxide measurement system provided by the present invention further includes a field temperature control box, which is electrically connected to the cabinet.

[0011] According to the present invention, a multi-probe continuous online carbon dioxide measurement system is provided, wherein each of the sampling probes is connected to the on-site gas mixing box through a sampling branch pipe, and each of the sampling branch pipes is provided with a manual control valve and a sampling solenoid valve, and the on-site gas mixing box is also provided with a mixed sample gas pressure gauge.

[0012] According to the present invention, a multi-probe continuous online carbon dioxide measurement system includes a sample gas pipeline comprising a sample gas delivery pipeline and a sample gas cooling pipeline. The first end of the sample gas delivery pipeline is connected to the on-site mixing box. The second end of the sample gas delivery pipeline, the first end of the sample gas cooling pipeline, and the first end of the internal backflushing compressed air pipeline are connected by a sampling three-way valve. The second end of the sample gas cooling pipeline is connected to the CO2 gas analyzer.

[0013] According to the present invention, a multi-probe continuous online carbon dioxide measurement system is provided, wherein the primary condenser, the precision filter and the secondary condenser are sequentially arranged on the sample gas cooling pipe section, and a sampling pump is also provided on the sample gas cooling pipe section.

[0014] According to the multi-probe continuous online carbon dioxide measurement system provided by the present invention, a sample gas flow meter and a hydrophobic filter are also provided on the sample gas cooling pipe section, and the sample gas flow meter and the hydrophobic filter are respectively arranged between the secondary condenser and the CO2 gas analyzer.

[0015] According to the present invention, a multi-probe continuous online carbon dioxide measurement system is provided, wherein the cabinet is further provided with a condensate collection tank, the primary condenser and the secondary condenser are respectively connected to the condensate collection tank through condensate discharge pipes, and a peristaltic pump is provided on each of the condensate discharge pipes.

[0016] According to the present invention, a multi-probe continuous online carbon dioxide measurement system is provided, wherein an internal purging solenoid valve and a second oil-water separator are respectively provided on the internal backflush compressed air pipeline, and the second end of the internal backflush compressed air pipeline is connected to a second compressed air source.

[0017] According to the present invention, a multi-probe continuous online carbon dioxide measurement system further includes a calibration subsystem. The calibration subsystem includes a standard gas main pipe and multiple standard gas branch pipes corresponding to the sampling probes. One end of each standard gas branch pipe is connected to one of the sampling probes, and the other end of each standard gas branch pipe is connected to one end of the standard gas main pipe. The other end of the standard gas main pipe is connected to a standard gas supply device. A calibration solenoid valve and a standard gas flow meter are respectively provided on the standard gas main pipe. A half-stroke calibration three-way valve is also provided on the sample gas cooling pipe section between the secondary condenser and the sample gas flow meter. The half-stroke calibration three-way valve is connected to the standard gas main pipe through a half-stroke calibration pipeline.

[0018] According to the multi-probe continuous online carbon dioxide measurement system provided by the present invention, the cabinet is further provided with an industrial control computer and an electrical control unit, and the industrial control computer and the electrical control unit are electrically connected to the CO2 gas analyzer respectively.

[0019] According to the multi-probe continuous online carbon dioxide measurement system provided by the present invention, an exhaust pipe is also connected to the sample gas cooling pipe section between the sampling pump and the secondary condenser, and the exhaust pipe is provided with a speed-up venting valve.

[0020] The multi-probe continuous online carbon dioxide measurement system provided by this invention includes a CO2 multi-point sampling subsystem, which allows for the placement of multiple sampling probes at different locations within the flue to collect flue gas from multiple points; a flue gas pretreatment subsystem, which uses a primary condenser, a precision filter, and a secondary condenser arranged sequentially to pre-treat the flue gas transported in the sample gas pipeline by filtering and removing water; a CO2 measurement subsystem, which uses a CO2 gas analyzer to analyze and measure the CO2 concentration of the pre-treated flue gas, thus adapting to large flue systems and uneven CO2 concentration distribution, and achieving accurate monitoring of CO2 emission concentration; and a probe external backflushing subsystem, which performs high-pressure purging on each sampling probe to accurately identify blockages and prevent clogging, further improving the accuracy of CO2 emission concentration monitoring. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the CO2 multi-point sampling subsystem in the multi-probe continuous online carbon dioxide measurement system of the present invention;

[0023] Figure 2 This is a schematic diagram of the external backflush subsystem of the multi-probe continuous online carbon dioxide measurement system of the present invention;

[0024] Figure 3 This is a schematic diagram of the flue gas pretreatment subsystem in the multi-probe continuous online carbon dioxide measurement system of the present invention;

[0025] Figure 4 This is a schematic diagram of the CO2 measurement subsystem in the multi-probe continuous online carbon dioxide measurement system of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Sampling probe; 2. On-site mixing chamber; 3. Flue; 4. Sample gas pipeline; 41. Sample gas delivery pipeline section; 42. Sample gas cooling pipeline section; 5. External backflush compressed air pipeline; 6. First oil-water separator; 7. First compressed air source; 8. Cabinet; 9. First-stage condenser; 10. Precision filter; 11. Second-stage condenser; 12. CO2 gas analyzer; 13. Sampling branch pipe; 14. Manual control valve; 15. Sampling solenoid valve; 16. Mixed sample gas pressure gauge; 17. On-site temperature control box; 18. Internal backflush compressed air pipeline; 19. 20. Sampling three-way valve; 21. Sampling pump; 22. Sample gas flow meter; 23. Drain filter; 24. Condensate collection tank; 25. Peristaltic pump; 26. External backflush branch pipe; 27. External purge solenoid valve; 28. Internal purge solenoid valve; 29. ​​Second oil-water separator; 30. Standard gas main pipe; 31. Standard gas branch pipe; 32. Standard gas supply equipment; 33. Calibration solenoid valve; 34. Standard gas flow meter; 35. Half-stroke calibration three-way valve; 36. Half-stroke calibration pipeline; 37. Industrial control computer; 38. Electrical control unit; 39. Exhaust pipeline; 30. Speed-up venting valve. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] like Figures 1 to 4 As shown, the multi-probe continuous online carbon dioxide measurement system of this invention includes a CO2 multi-point sampling subsystem, a probe external backflushing subsystem, a flue gas pretreatment subsystem, and a CO2 measurement subsystem.

[0032] The CO2 multi-point sampling subsystem includes multiple sampling probes 1 and an on-site mixing chamber 2. Each sampling probe 1 is installed inside the flue duct 3 and connected to the on-site mixing chamber 2. The on-site mixing chamber 2 is connected to the first end of the sample gas pipeline 4. The number of sampling probes 1 can be arranged according to actual needs to achieve multi-point flue gas collection. The flue gas collected by each sampling probe 1 in the flue duct 3 can be mixed evenly in the on-site mixing chamber 2 before being transported through the sample gas pipeline 4.

[0033] The probe backflushing subsystem includes an external backflushing compressed air pipeline 5 and a first oil-water separator 6 installed on the external backflushing compressed air pipeline 5. One end of the external backflushing compressed air pipeline 5 is connected to a first compressed air source 7, and each sampling probe 1 is connected to the other end of the external backflushing compressed air pipeline 5. The first compressed air source 7 can supply compressed air to the external backflushing compressed air pipeline 5. After being processed by the first oil-water separator 6, the compressed air is delivered to each sampling probe 1 in the flue 3 to directly backflush each sampling probe 1 and prevent the sampling probe 1 from becoming clogged.

[0034] The flue gas pretreatment subsystem includes a primary condenser 9, a precision filter 10, and a secondary condenser 11 installed in the cabinet 8. The primary condenser 9, the precision filter 10, and the secondary condenser 11 are sequentially installed on the sample gas pipeline 4 to filter and remove water from the flue gas.

[0035] The CO2 measurement subsystem includes a CO2 gas analyzer 12 installed in the cabinet 8. The CO2 gas analyzer 12 is connected to the other end of the sample gas pipeline 4 and is used to perform CO2 concentration analysis and measurement.

[0036] Therefore, the multi-probe continuous online carbon dioxide measurement system provided by the present invention achieves multi-point sampling by setting multiple sampling probes 1 at different locations in the flue 3. It can adapt to large flues and uneven CO2 concentration distribution, and achieve accurate monitoring of CO2 emission concentration. At the same time, by setting a flue gas pretreatment subsystem, the flue gas can be filtered and dehydrated before analysis and measurement. By setting an external backflushing subsystem, each sampling probe 1 can be purged under high pressure, which can accurately identify the blockage location and prevent the sampling probe 1 from becoming blocked.

[0037] Specifically, each sampling probe 1 is connected to the on-site mixing chamber 2 via a sampling branch pipe 13. Each sampling branch pipe 13 is equipped with a manual control valve 14 and a sampling solenoid valve 15. The on-site mixing chamber 2 is also equipped with a mixed sample gas pressure gauge 16. That is, by setting the manual control valve 14 and the sampling solenoid valve 15, the state of flue gas delivery from each sampling probe 1 to the on-site mixing chamber 2 can be controlled. The mixed sample gas pressure gauge 16 allows for the detection of the pressure of the mixed flue gas. Each sampling branch pipe 13 is a heat-traced pipeline.

[0038] Furthermore, the multi-probe continuous online carbon dioxide measurement system also includes a field temperature control box 17, which is connected to the cabinet 8 via cables. The cabinet 8 provides power to the field temperature control box 17. The field temperature control box 17 is connected to each sampling probe 1, each sampling branch pipe 13, and the field gas mixing box 2 via cables. It not only provides power to these components but also transmits their temperature signals to the cabinet 8.

[0039] Specifically, the sample gas pipeline 4 includes a sample gas delivery pipeline section 41 and a sample gas cooling pipeline section 42. The first end of the sample gas delivery pipeline section 41 is connected to the on-site mixing box 2. The second end of the sample gas delivery pipeline section 41, the first end of the sample gas cooling pipeline section 42, and the first end of the internal backflush compressed air pipeline 18 are connected by a sampling three-way valve 19. The second end of the sample gas cooling pipeline section 42 is connected to the CO2 gas analyzer 12.

[0040] Specifically, the primary condenser 9, the precision filter 10, and the secondary condenser 11 are sequentially arranged on the sample gas cooling pipe section 42, and a sampling pump 20 is also provided on the sample gas cooling pipe section 42 to improve the sampling power.

[0041] Specifically, a sample gas flow meter 21 and a hydrophobic filter 22 are also provided on the sample gas cooling pipe section 42. The sample gas flow meter 21 and the hydrophobic filter 22 are respectively located between the secondary condenser 11 and the CO2 gas analyzer 12. The sample gas flow meter 21 is used to measure the flue gas flow rate, and the hydrophobic filter 22 is used to filter water molecules in the flue gas.

[0042] Specifically, the cabinet 8 is also equipped with a condensate collection tank 23. The primary condenser 9 and the secondary condenser 11 are connected to the condensate collection tank 23 through condensate drain pipes. A peristaltic pump 24 is installed on each condensate drain pipe to discharge the water condensed by the condenser to the condensate collection tank 23 for collection.

[0043] Specifically, each sampling probe 1 is connected to the external backflush compressed air pipeline 5 through an external backflush branch pipe 25. Each external backflush branch pipe 25 is equipped with an external purge solenoid valve 26, which is used to control the external backflush of each sampling probe 1 individually or simultaneously.

[0044] Specifically, an internal purge solenoid valve 27 and a second oil-water separator 28 are respectively installed on the internal backflush compressed air pipeline 18. The second end of the internal backflush compressed air pipeline 18 is connected to a second compressed air source. The second compressed air source can supply compressed air to the internal backflush compressed air pipeline 18. After being processed by the second oil-water separator 28, the compressed air enters the sample gas delivery pipe section 41 of the sample gas pipeline 4 through the sampling three-way valve 19 in the cabinet 8, and then reaches the field mixing box 2. After passing through the field mixing box 2, it reaches each sampling probe 1 through each sampling branch pipe 13 for backflush, thereby achieving backflush of the entire pipeline and preventing pipeline blockage.

[0045] Furthermore, this multi-probe continuous online carbon dioxide measurement system also includes a calibration subsystem. The calibration subsystem includes a standard gas main pipe 29 and multiple standard gas branch pipes 30 corresponding to each sampling probe 1. One end of each standard gas branch pipe 30 is connected to a corresponding sampling probe 1, and the other end of each standard gas branch pipe 30 is connected to one end of the standard gas main pipe 29. The other end of the standard gas main pipe 29 is connected to the standard gas supply device 31. The calibration subsystem is used to periodically introduce standard gas into the CO2 gas analyzer 12 for full-process calibration.

[0046] Among them, a calibration solenoid valve 32 and a calibration gas flow meter 33 are respectively installed on the standard gas main pipe 29.

[0047] A half-range calibration three-way valve 34 is also installed on the sample gas cooling pipe section 42 between the secondary condenser 11 and the sample gas flow meter 21. The half-range calibration three-way valve 34 is connected to the main calibration gas pipe 29 via a half-range calibration pipe 35. The half-range calibration pipe 35 is connected to the main calibration gas pipe 29 between the calibration solenoid valve 32 and the calibration gas flow meter 33 to achieve half-range calibration of the system.

[0048] Furthermore, the cabinet 8 also houses an industrial control computer 36 and an electrical control unit 37, which are electrically connected to the CO2 gas analyzer 12.

[0049] Furthermore, an exhaust pipe 38 is connected to the sample gas cooling pipe section 42 between the sampling pump 20 and the secondary condenser 11, and an acceleration venting valve 39 is installed on the exhaust pipe 38. After the CO2 concentration analysis measurement is completed, the remaining gas can be vented through the exhaust pipe 38.

[0050] The multi-probe continuous online carbon dioxide measurement system of this invention can monitor carbon dioxide emissions using two measurement modes: a rotation measurement mode and a mixed-gas measurement mode. The following explanation uses three sampling probes 1 as an example to illustrate these two measurement modes.

[0051] The rotation measurement mode is as follows: During system measurement, the measurement of sampling probe 1 (#1) is performed first. The sampling solenoid valve 15 on sampling branch pipe 13 (#1) is opened, while the solenoid valves on sampling branch pipes 13 (#2) and 13 (#3) are closed. After sampling probe 1 (#1) completes its measurement, sampling probe 1 (#2) is measured in the same manner. After sampling probe 1 (#2) completes its measurement, sampling probe 1 (#3) is measured in the same manner.

[0052] The gas mixing measurement mode is as follows: When the system is measuring, the sampling solenoid valves 15 on sampling branch pipes 1#, 2#, and 3# are opened simultaneously, and the manual control valves 14 on each sampling branch pipe 13 are adjusted to make the gas volume drawn by each sampling branch pipe 13 equal. The gas is then mixed before measurement.

[0053] The working process of the multi-probe continuous online carbon dioxide measurement system according to an embodiment of the present invention is as follows:

[0054] After each sampling branch pipe 13 is preheated to the specified temperature, the system enters the measurement state and switches to the sampling working mode. Under the action of the sampling pump 20, the flue gas to be measured is drawn through multiple sampling probes 1 and enters the heating chamber of the sampling probe 1 after passing through a high-efficiency dust filter. After being heated by the sampling branch pipe 13, it enters the on-site mixing box 2 through the sampling solenoid valve 15 and is fully mixed. Then, it enters the cabinet 8 through the sample gas pipeline 4. After entering the cabinet 8, the flue gas first passes through the sampling three-way valve 19 and then enters the flue gas pretreatment subsystem for treatment to remove moisture from the flue gas. After that, it is sent to the gas chamber of the CO2 gas analyzer 12. Then, the CO2 gas analyzer 12 analyzes the flue gas, obtains the CO2 concentration, and then exhausts the remaining gas through the exhaust pipeline 38.

[0055] After the system has been running for a period of time, it will automatically switch to backflushing mode to ensure that the measuring pipeline and sampling probe 1 are not blocked during long-term use. The backflushing mode includes external backflushing mode and internal backflushing mode. By controlling the external backflushing subsystem, each sampling probe 1 can be directly backflushed. By controlling the equipment on the internal backflushing compressed air pipeline 18, the entire pipeline can be backflushed. Both internal and external backflushing modes can be intelligently controlled in multiple modes, such as single-probe backflushing, rotating backflushing, and full-path backflushing, through the control of solenoid valves in the pipeline. This allows for precise control of targeted backflushing throughout the pipeline, preventing blockages.

[0056] The rotating backflushing working mode is as follows: During internal system purging, when sampling probe 1 is purged, the sampling solenoid valve 15 on sampling branch pipe 13 is opened, and the sampling solenoid valves 15 on sampling branch pipes 2 and 3 are closed. After sampling probe 1 is purged, sampling probe 2 is backflushed in the same way; after sampling probe 2 is purged, sampling probe 3 is purged in the same way. During external system purging, when sampling probe 1 is purged, the external purging solenoid valve 26 on external backflushing branch pipe 25 is opened, and the external purging solenoid valves 26 on external backflushing branch pipes 25 are closed. After sampling probe 1 is purged, sampling probe 2 is backflushed in the same way; after sampling probe 2 is purged, sampling probe 3 is purged in the same way.

[0057] The full-path purging working mode is as follows: When the system is purging externally, the external purging solenoid valves 26 on the external backflush branch pipes 25 of #1, #2 and #3, and the sampling solenoid valves 15 on the sampling branch pipes 13 of #1, #2 and #3 are opened simultaneously to perform full-path purging.

[0058] The single-probe backflush operating mode is as follows: During external purging, only the external purging solenoid valve 26 on one external backflush branch pipe 25 is opened for external backflush, while the external purging solenoid valves 26 on the other external backflush branch pipes 25 are closed. During internal purging, only the sampling solenoid valve 15 on one sampling branch pipe 13 is opened for internal backflush, while the sampling solenoid valves 15 on the other sampling branch pipes 13 are closed.

[0059] When the system is calibrated, the system will switch to calibration mode, open calibration solenoid valve 32, and then the calibration gas will pass through sampling branch pipe 13, on-site mixing box 2, and flue gas pretreatment subsystem on sample gas pipeline 4 before finally entering CO2 gas analyzer 12, thereby achieving system calibration.

[0060] In summary, the multi-probe continuous online carbon dioxide measurement system of this invention, compared with the conventional single-probe online carbon dioxide monitoring system, can accurately monitor carbon dioxide concentration in large flues and under conditions of uneven CO2 concentration distribution, ensuring the accuracy of carbon emission accounting under complex flow fields and uneven operating conditions.

[0061] The multi-probe continuous online carbon dioxide measurement system of this invention, compared with conventional multi-probe online monitoring systems for pollution sources, can achieve balanced flue gas flow in each sampling branch by setting up sampling solenoid valves and manual control valves in each sampling branch, thereby realizing accurate monitoring of CO2 concentration.

[0062] The multi-probe continuous online carbon dioxide measurement system of this invention can adopt either a rotation measurement mode or a mixed gas measurement mode according to different field conditions, thus adapting to more complex working conditions.

[0063] The multi-probe continuous online carbon dioxide measurement system of this invention can perform intelligent control in multiple modes, such as single-probe backflushing, rotating backflushing, and full-path backflushing, through the control of solenoid valves in the pipeline in both external and internal backflushing modes, thereby avoiding system blockage and ensuring long-term reliable operation of the system.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-probe continuous online carbon dioxide measurement system, characterized in that, include: The CO2 multi-point sampling subsystem includes multiple sampling probes and an on-site mixing box. Each sampling probe is installed in the flue and connected to the on-site mixing box. The on-site mixing box is connected to the first end of the sample gas pipeline. The probe external backflush subsystem includes an external backflush compressed air pipeline and a first oil-water separator installed on the external backflush compressed air pipeline. One end of the external backflush compressed air pipeline is connected to a first compressed air source, and each of the sampling probes is connected to the other end of the external backflush compressed air pipeline. The flue gas pretreatment subsystem includes a primary condenser, a precision filter, and a secondary condenser installed in a cabinet, wherein the primary condenser, the precision filter, and the secondary condenser are sequentially installed on the sample gas pipeline; The CO2 measurement subsystem includes a CO2 gas analyzer installed in the cabinet, and the CO2 gas analyzer is connected to the other end of the sample gas pipeline. Each of the sampling probes is connected to the on-site gas mixing box via a sampling branch pipe, and each of the sampling branch pipes is a heat tracing pipeline; It also includes a field temperature control box, which is electrically connected to the cabinet; the field temperature control box is connected to each of the sampling probes, each of the sampling branch pipes and the field gas mixing box via cables, and can not only supply power to each of the sampling probes, each of the sampling branch pipes and the field gas mixing box, but also transmit the temperature signals of each of the sampling probes, each of the sampling branch pipes and the field gas mixing box to the cabinet through the field temperature control box; The sample gas pipeline includes a sample gas delivery pipeline section and a sample gas cooling pipeline section. The first end of the sample gas delivery pipeline section is connected to the on-site mixing box. The second end of the sample gas delivery pipeline section, the first end of the sample gas cooling pipeline section, and the first end of the internal backflush compressed air pipeline are connected by a sampling three-way valve. The second end of the sample gas cooling pipeline section is connected to the CO2 gas analyzer. The primary condenser, the precision filter, and the secondary condenser are sequentially arranged on the sample gas cooling pipe section, and a sampling pump is also provided on the sample gas cooling pipe section; A sample gas flow meter and a hydrophobic filter are also provided on the sample gas cooling pipe section. The sample gas flow meter and the hydrophobic filter are respectively located between the secondary condenser and the CO2 gas analyzer. An internal backflush compressed air pipeline is provided with an internal purge solenoid valve and a second oil-water separator, and the second end of the internal backflush compressed air pipeline is connected to a second compressed air source. It also includes a calibration subsystem, which comprises a main calibration gas pipe and multiple calibration gas branch pipes corresponding to the sampling probes. One end of each calibration gas branch pipe is connected to one of the sampling probes, and the other end of each calibration gas branch pipe is connected to one end of the main calibration gas pipe. The other end of the main calibration gas pipe is connected to a calibration gas supply device. A calibration solenoid valve and a calibration gas flow meter are respectively provided on the main calibration gas pipe. A half-stroke calibration three-way valve is also provided on the sample gas cooling pipe section between the secondary condenser and the sample gas flow meter. The half-stroke calibration three-way valve is connected to the main calibration gas pipe through a half-stroke calibration pipeline.

2. The multi-probe continuous online carbon dioxide measurement system according to claim 1, characterized in that, Each of the sampling branch pipes is equipped with a manual control valve and a sampling solenoid valve, and the on-site gas mixing box is also equipped with a mixed sample gas pressure gauge.

3. The multi-probe continuous online carbon dioxide measurement system according to claim 1, characterized in that, The cabinet is also equipped with a condensate collection tank. The primary condenser and the secondary condenser are respectively connected to the condensate collection tank through condensate drain pipes. A peristaltic pump is provided on each of the condensate drain pipes.

4. The multi-probe continuous online carbon dioxide measurement system according to claim 1, characterized in that, The cabinet also houses an industrial control computer and an electrical control unit, which are electrically connected to the CO2 gas analyzer.

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