Closed-loop greenhouse gas measuring system

Abstract

The utility model discloses a closed-loop type greenhouse gas measuring system. The closed-loop type greenhouse gas measuring system comprises a sampling pipeline, a closed-loop type instrument box, a gas inlet control box and a controller, a water removal assembly and a dust removal assembly are arranged on the sampling pipeline, a gas detection assembly is arranged in the closed circuit type instrument box, the gas inlet control box comprises an environment gas pipeline and a calibration gas pipeline, and the gas inlet end of the environment gas pipeline is connected to the sampling pipeline; the gas outlet end of the environment gas pipeline and the gas outlet end of the calibration gas pipeline are both connected with the closed-circuit type instrument box, electromagnetic valves are arranged on the environment gas pipeline and the calibration gas pipeline, and the controller is electrically connected to the electromagnetic valves and used for controlling the electromagnetic valves to be opened and closed. According to the closed-loop greenhouse gas measuring system, gas detection and instrument correction can be automatically executed through on-off control of each electromagnetic valve, the intelligent degree is high, and the accuracy of instrument detection data can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring technology, and in particular to a closed-circuit greenhouse gas measurement system. Background Technology

[0002] Carbon dioxide (CO2) is a significant component of the atmosphere, and its concentration changes have a substantial impact on climate change, indoor air quality, and industrial production processes. Currently, common CO2 monitoring equipment is divided into open-circuit and closed-circuit types. Open-circuit equipment is susceptible to interference from environmental factors (such as wind speed and humidity), resulting in lower measurement accuracy. While existing closed-circuit equipment offers higher accuracy, its complex structure and high cost make it difficult to widely apply in small and medium-sized locations. Furthermore, related technologies require periodic manual calibration of gas measurement systems, resulting in low levels of automation and hindering improvements in gas detection efficiency. Utility Model Content

[0003] To solve one of the above-mentioned technical problems, this utility model provides a closed-loop greenhouse gas measurement system.

[0004] The present invention adopts the following technical solution:

[0005] A closed-loop greenhouse gas measurement system includes:

[0006] A sampling pipeline, wherein a water removal component and a dust removal component are provided on the sampling pipeline;

[0007] A closed-circuit instrument box, wherein a gas detection component is installed inside the closed-circuit instrument box;

[0008] An air intake control box includes an ambient gas pipeline and a calibration gas pipeline. The air intake end of the ambient gas pipeline is connected to the sampling pipeline. The air outlet ends of both the ambient gas pipeline and the calibration gas pipeline are connected to the closed-loop instrument box. Solenoid valves are installed on both the ambient gas pipeline and the calibration gas pipeline.

[0009] A controller is electrically connected to each of the solenoid valves, and the controller is used to control the opening and closing of each solenoid valve.

[0010] Optionally, the calibration gas pipeline includes a low-concentration calibration gas pipeline, a high-concentration calibration gas pipeline, and a standard gas pipeline;

[0011] The low-concentration standard gas pipeline is connected to a low-concentration standard gas source;

[0012] The high-concentration standard gas pipeline is connected to a high-concentration standard gas source;

[0013] The standard gas pipeline is connected to a standard gas source;

[0014] Solenoid valves are installed on the low-concentration standard gas pipeline, the high-concentration standard gas pipeline, and the standard gas pipeline.

[0015] Optionally, the solenoid valve on the ambient gas pipeline is a normally open solenoid valve;

[0016] The solenoid valves on the low-concentration standard gas pipeline, the high-concentration standard gas pipeline, and the standard gas pipeline are normally closed solenoid valves.

[0017] Optionally, the air intake control box includes an output pipe, and the low-concentration standard gas pipeline, high-concentration standard gas pipeline, standard gas pipeline and ambient gas pipeline are all connected to the output pipe;

[0018] The closed-circuit instrument box includes multiple branch lines, each of which is connected to the output pipe;

[0019] The gas detection component includes multiple sensors;

[0020] Each of the aforementioned sensors is installed in its respective shunt pipe.

[0021] Optionally, each of the sensors includes multiple CO2 sensors and a temperature, pressure and humidity sensor;

[0022] Each of the CO2 sensors and the temperature, pressure and humidity sensors is respectively installed in a shunt pipeline.

[0023] Optionally, each of the branch lines is equipped with a flow regulator.

[0024] Optionally, the closed-circuit greenhouse gas measurement system includes an industrial control computer, a camera device, a hard disk recorder, and a router, wherein the router is connected to the industrial control computer, the hard disk recorder, the camera device, and each of the sensors.

[0025] Optionally, the sampling pipeline includes:

[0026] The sampling tube is provided with both the dust removal component and the water removal component, with the water removal component located downstream of the dust removal component.

[0027] A sampling pump is disposed in the sampling tube.

[0028] Optionally, the closed-loop greenhouse gas measurement system includes an exhaust pipe and an exhaust regulating valve installed on the exhaust pipe;

[0029] The vent pipe is connected to the sampling pipe and is located downstream of the sampling pump.

[0030] Optionally, the sampling pipeline includes a flow regulator, which is disposed on the sampling pipe downstream of the drain pipe.

[0031] By adopting the above technical solution, this application has the following beneficial effects:

[0032] The closed-circuit greenhouse gas measurement system of this application can achieve stable carbon dioxide concentration monitoring. This closed-circuit greenhouse gas measurement system is characterized by its simple structure, low cost, and ease of maintenance. Through the on / off control of various solenoid valves, the closed-circuit greenhouse gas measurement system of this application can automatically perform gas detection and instrument calibration, exhibiting a high degree of intelligence and helping to ensure the accuracy of instrument detection data.

[0033] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0034] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0035] Figure 1 This diagram illustrates the structure of the pretreatment system in the closed-loop greenhouse gas measurement system provided in an embodiment of the present disclosure.

[0036] Figure 2 This diagram shows a schematic representation of the structure of the air intake control box in a closed-loop greenhouse gas measurement system provided in an embodiment of this disclosure.

[0037] Figure 3 This diagram shows a structural schematic of the closed-circuit instrument box in a closed-circuit greenhouse gas measurement system provided in an embodiment of the present disclosure;

[0038] Figure 4 This diagram illustrates the communication principle of a closed-circuit greenhouse gas measurement system provided in an embodiment of this disclosure.

[0039] Figure 5 A schematic diagram of the overall structure of the closed-circuit greenhouse gas measurement system provided in an embodiment of this disclosure is shown.

[0040] In the diagram: 1. Pretreatment system; 11. Sampling pipeline; 111. Sampling head; 1111. Inlet hood; 1111a. Filter screen; 1112. Air guide pipe; 1112a. Filter; 112. Sampling rod; 113. Main sampling pipeline; 12. First capsule filter; 13. Second capsule filter; 14. Condenser; 15. Sampling pump; 16. Exhaust pipe; 161. Exhaust regulating valve; a. Flow regulator; b. Peristaltic pump; 2. Closed-loop instrument box; 21. Diverter pipeline; 221. CO2 sensor; 222. Temperature, pressure and humidity sensor; 3. Inlet control box; 31. Ambient gas pipeline; 32. Low-concentration standard gas pipeline; 33. High-concentration standard gas pipeline; 34. Standard gas pipeline; 35. Solenoid valve; 39. Output pipe; 4. Controller.

[0041] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0043] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] Example 1

[0046] See Figures 1 to 5As shown in the figure, this application provides a closed-loop greenhouse gas measurement system, including: a sampling pipeline 11, a closed-loop instrument box 2, an inlet control box 3, and a controller 4. The sampling pipeline 11 is equipped with a water removal component and a dust removal component. The closed-loop instrument box 2 contains a gas detection component. The inlet control box 3 includes an ambient gas pipeline 31 and a calibration gas pipeline. The inlet end of the ambient gas pipeline 31 is connected to the sampling pipeline 11, and the outlet ends of both the ambient gas pipeline 31 and the calibration gas pipeline are connected to the closed-loop instrument box 2. Both the ambient gas pipeline 31 and the calibration gas pipeline are equipped with solenoid valves 35. The controller 4 is electrically connected to each of the solenoid valves 35, and the controller 4 is used to control the opening and closing of each solenoid valve 35.

[0047] The closed-circuit greenhouse gas measurement system of this application can achieve stable carbon dioxide concentration monitoring. This closed-circuit greenhouse gas measurement system is characterized by its simple structure, low cost, and ease of maintenance. Through the on / off control of each solenoid valve 35, the closed-circuit greenhouse gas measurement system can automatically perform gas detection and instrument calibration, exhibiting a high degree of intelligence and helping to ensure the accuracy of instrument detection data.

[0048] In some possible implementations, such as Figure 1 and Figure 2 As shown, the calibration gas pipeline includes a low-concentration standard gas pipeline 32, a high-concentration standard gas pipeline 33, and a standard gas pipeline 34. The low-concentration standard gas pipeline 32 is connected to a low-concentration standard gas source, the high-concentration standard gas pipeline 33 is connected to a high-concentration standard gas source, and the standard gas pipeline 34 is connected to a standard gas source, which is a medium-concentration gas source. Solenoid valves 35 are installed on all three pipelines: the low-concentration standard gas pipeline 32, the high-concentration standard gas pipeline 33, and the standard gas pipeline 34.

[0049] Under the control of controller 4, intake control box 3 has the following four operating conditions:

[0050] Sample gas introduction condition: Solenoid valve 35 on the ambient gas pipeline 31 is open, solenoid valves 35 on the other three pipelines are closed, and external sample gas enters;

[0051] Operating condition of low concentration standard gas introduction: control the solenoid valve 35 on the low concentration standard gas pipeline 32 to open, and the solenoid valves 35 on the other three pipelines to close.

[0052] Operating condition when high-concentration standard gas is introduced: Solenoid valve 35 on high-concentration standard gas pipeline 33 is open, and solenoid valves 35 on the other three pipelines are closed;

[0053] Operating condition for medium concentration verification standard gas introduction: Solenoid valve 35 on standard gas pipeline 34 is open, and solenoid valves 35 on the other three pipelines are closed.

[0054] Under normal circumstances, the closed-loop greenhouse gas measurement system introduces ambient air. When the set automatic calibration time is reached, the controller 4 controls each solenoid valve 35 to sequentially introduce low and high concentration standard gases into the closed-loop instrument box 2. Each standard gas is maintained for 10 minutes. After the high concentration standard gas is introduced, the controller 4 analyzes the data during the introduction of low and high concentration standard gases to obtain the instrument's calibration parameters, updates them to the gas detection components, and controls the introduction of a standard gas source, i.e., a medium concentration gas source. The system then compares and calculates the detected value with the actual value. If the comparison result meets the requirements, the system can switch to the sample gas introduction mode and can normally detect the outside air.

[0055] In some possible implementations, the solenoid valve 35 on the ambient gas pipeline 31 is a normally open solenoid valve 35, while the solenoid valves 35 on the low-concentration standard gas pipeline 32, the high-concentration standard gas pipeline 33, and the standard gas pipeline 34 can all be normally closed solenoid valves 35. Since the ambient gas pipeline 31 is directly connected to the sampling pipeline 11, the solenoid valve 35 on the ambient gas pipeline 31 is in the conducting state for a relatively long time; therefore, the solenoid valve 35 on the ambient gas pipeline 31 is set as a normally open solenoid valve 35.

[0056] In some possible implementations, such as Figure 2 and Figure 3 As shown, the intake control box 3 includes an output pipe 39. The low-concentration standard gas pipeline 32, the high-concentration standard gas pipeline 33, the standard gas pipeline 34, and the ambient gas pipeline 31 are all connected to the output pipe 39. Each pipeline can be connected to the output pipe 39 via a tee. The closed-loop instrument box 2 includes multiple branch pipelines 21, each of which is connected to the output pipe 39. The gas detection component includes multiple sensors, each of which is respectively installed in a corresponding branch pipeline 21 to detect the gas in each branch pipeline 21. The closed-loop instrument box 2 may include a main pipe, and each branch pipeline 21 is connected to the main pipe, which is then connected to the output pipe 39. The gas distributed to each branch pipeline 21 through the main pipe is the same.

[0057] like Figure 2 As shown, flow regulators a are installed on the low-concentration standard gas pipeline 32, the high-concentration standard gas pipeline 33, the standard gas pipeline 34, and the ambient gas pipeline 31, which can control the flow rate of each gas to be consistent, for example, controlling the flow rate of each gas to be about 0.5L / min.

[0058] In some possible implementations, each of the sensors includes multiple CO2 sensors 221 and one temperature, pressure, and humidity sensor 222, with each CO2 sensor 221 and temperature, pressure, and humidity sensor 222 respectively disposed in a shunt pipe 21. The CO2 sensor 221 can be a non-dispersive infrared (NDIR) sensor or an electrochemical sensor for accurately measuring the carbon dioxide concentration in a gas sample. The gas detection assembly of this application may include three identical CO2 sensors 221 and one temperature, pressure, and humidity sensor 222, with temperature, pressure, and humidity calibration performed on the CO2 sensor 221. All sensors are closed-circuit type. Flow meters can be installed on each of the four shunt pipes 21 to evenly distribute the inlet gas flow in the main pipe to the four sensors, ensuring that the sensors measure the same gas stream. The exhaust gas from the sensor outlet is collected together through a multi-port connector for easy discharge into the instrument. For example, by installing flow regulators a on each of the four shunt pipes 21, the flow rate of each gas stream can be controlled to 120 mL / min.

[0059] The temperature, pressure and humidity sensor 222 is used for the correction of weather and environmental sensitivity, and the parameters can be fitted using multiple linear regression and stepwise regression methods.

[0060] The measurement system described in this application can perform baseline calibration using low- and high-concentration standard gases at two points. It is suitable for areas with significant fluctuations in the concentration of the gas being measured. The working gas should cover the concentration range of the gas being measured in the monitored area. It is recommended that the high-concentration standard gas source be located near the 90th percentile of the hourly concentration throughout the year, and the low-concentration standard gas source be located near the 10th percentile of the hourly concentration throughout the year. The calibration method is as follows:

[0061] 1) Introduce low-concentration standard gas and high-concentration standard gas into the air intake control box 3 sequentially, for 15 minutes each time. After the readings stabilize, record the response concentration values ​​of the gas detection component to each concentration of standard gas. Take the average of the last 5 minutes as the recorded result. The last minute's record should be removed during calculation.

[0062] 2) The least squares method is used to obtain the fitting equation of the calibration curve Y = aX + b, where X is the response concentration value of the gas detection component to the standard gas, Y is the nominal concentration value of the standard gas, a is the slope, and b is the intercept.

[0063] 3) Calculate the corrected concentration value using the formula.

[0064] C = a C′ + b

[0065] Where: C - the corrected concentration value of the monitoring data, ppb or ppm;

[0066] a-Slope of the calibration curve;

[0067] b - Calibration curve intercept, ppb or ppm;

[0068] C′ - The concentration value of the gas detection component in response to the sample gas, expressed in ppb or ppm.

[0069] In some possible implementations, the closed-circuit greenhouse gas measurement system includes an industrial computer, a camera device, a hard disk recorder, and a router, the router being connected to the industrial computer, the hard disk recorder, the camera device, and each of the sensors.

[0070] By designing a structure including an industrial control computer, camera, hard disk recorder, and router, data from gas detection components can be collected and transmitted to external devices (such as computers or cloud platforms) via wired or wireless means, enabling real-time monitoring and remote control. The industrial control computer, which may include a monitor, is used to collect data from the gas detection components, store it locally, and transmit and display the data. The monitor displays data from the industrial control computer's instruments and allows for instrument configuration. The router can be a 4G communication router, enabling the instruments to connect to the network and transmit data. Connecting to the router via a network cable connects the industrial control computer to the same network, allowing the industrial control computer to collect, display, and control the data. The data acquisition and transmission software can be deployed within the industrial control computer, collecting sensor data from the monitoring instruments, storing it locally, and uploading it from a single point to multiple platforms as required by the customer.

[0071] A sampling pump 15 is installed on the sampling pipeline 11, and the water removal component is located downstream of the dust removal component. The closed-loop greenhouse gas measurement system may include an exhaust pipe 16 and an exhaust regulating valve 161 installed on the exhaust pipe 16. The exhaust pipe 16 is connected to the sampling pipeline 11 and is located downstream of the sampling pump 15. A flow regulator a is installed on the sampling pipeline 11 downstream of the exhaust pipe 16.

[0072] A closed-circuit greenhouse gas measurement system may also include auxiliary equipment, selected from one or more of the following: server rack, UPS, voltage regulator, air conditioner, fire extinguisher, and thermometer / hygrometer. The server rack houses and supports the main components of the entire system. The voltage regulator provides a stable voltage, especially important in suburban sites where grid voltage fluctuations can exceed the instrument's normal operating voltage range, leading to malfunctions or damage. The UPS provides short-term backup power to prevent instrument failure and interruption of observations during brief power outages. Air conditioning maintains the temperature and humidity within the station building within the required range. Fire extinguishers are used for fire emergency response. The thermometer / hygrometer monitors the current temperature and humidity.

[0073] Example 2

[0074] like Figures 1 to 5As shown in the embodiment of this application, the gas measurement system is further described. The gas measurement system includes a pretreatment system 1 for water and dust removal. The pretreatment system 1 includes a sampling pipeline 11, a dust removal component, a water removal component, a sampling pump 15, and a flow regulator a. The sampling pipeline 11 is used to extract gas samples from the environment to be tested. The pipeline material can be a corrosion-resistant, low-adsorption material (such as polytetrafluoroethylene) to ensure that the gas sample is not contaminated during transmission. The dust removal component is disposed on the sampling pipeline 11, and the water removal component is disposed on the sampling pipeline 11, with the water removal component located downstream of the dust removal component. The water removal component includes a condenser 14 and a capsule filter. The sampling pump 15 is disposed on the sampling pipeline 11, and the flow regulator a is disposed on the sampling pipeline 11.

[0075] The pretreatment system 1 of this application can effectively remove moisture and dust from the sample gas. The water removal component includes a condenser 14 and a capsule filter. The condenser 14 condenses the sample gas and discharges the condensed liquid water, while the capsule filter intercepts and discharges the liquid water in the sample gas. The combination of the condenser 14 and the capsule filter achieves a good water removal effect, improving the measurement accuracy of the gas measuring equipment. In addition, the water removal component dries the gas, preventing excessive moisture from entering the components inside the gas measuring equipment, which helps extend the service life of the components and improves the stability of the system.

[0076] It should be noted that flow regulator a can be a commonly used float flow regulator, which has a range and scale, and an adjustment knob, and can adjust and indicate the gas flow rate in the current pipeline channel.

[0077] In some possible implementations, such as Figure 1 As shown, the capsule filter includes a first capsule filter 12. The first capsule filter 12 and the condenser 14 are both disposed in the sampling pipeline 11. The first capsule filter 12 and the condenser 14 are arranged sequentially along the air inlet direction of the sampling pipeline 11. The sampling pump 15 is located between the condenser 14 and the first capsule filter 12.

[0078] The first capsule filter 12, the sampling pump 15, and the condenser 14 are arranged sequentially along the direction of sample gas flow. The sampling pump 15 provides the power for gas flow. The sampling pump 15 is used to draw sample gas near the sampling port of the sampling pipeline 11 into the station building, driving the sample gas flow within the system. The sampling pump 15 can also be installed at the end of the sampling pipeline 11, using a negative pressure extraction scheme. The first capsule filter 12 can be a 1µm filter 1112a, which can filter out PM2.5 particles in the sample gas, preventing particles from entering the downstream pipeline and affecting the detection.

[0079] In some possible implementations, such as Figure 1 As shown, the capsule filter includes a second capsule filter 13, which is disposed on the sampling pipeline 11 on the side of the condenser 14 away from the sampling pump 15. That is, the first capsule filter 12, the sampling pump 15, the condenser 14, and the second capsule filter 13 are arranged sequentially along the flow direction of the sample gas.

[0080] The second capsule filter 13 can be a 0.2µm capsule filter. The 0.2µm capsule filter uses a PTFE membrane with a 0.2µm pore size, which can intercept liquid water in the sample gas and store it in the filter capsule. The drain port of the filter capsule is connected to the drain hose and the peristaltic pump b, which discharges the liquid water and part of the sample gas from the pipeline into the system sampling pipeline 11.

[0081] The condenser 14 can be a compressor-type condenser 14, which can reduce the temperature to about 3°C. When the sample gas with a temperature higher than 3°C passes through the double-helix cold chamber pipeline of the condenser 14, condensation occurs. The condensed liquid water enters the bottom of the cold chamber and is eventually discharged.

[0082] In some possible implementations, the gas sample pretreatment system 1 for removing water and dust also includes a peristaltic pump b, and the first capsule filter 12, the second capsule filter 13 and the condenser 14 are all connected to a drain hose, with the peristaltic pump b and the drain hose being driven together.

[0083] For example, the interface at the bottom of the cold chamber of condenser 14 is connected to a drain hose, and peristaltic pump b discharges liquid water and part of the sample gas, thereby removing moisture from the sample gas. A bladder filter can be a commercially available product. The bladder filter includes an inlet, a drain outlet, and an outlet. The sample gas enters through the inlet, passes through the filter media, and is discharged through the outlet. The drain outlet can be connected to a drain hose for easy liquid removal. It should be noted that the existing technology used in the bladder filter is not part of the design of this application. For the structure and principle of the bladder filter, please refer to published literature; this application will not elaborate further. Peristaltic pump b drives drainage by rotating a component to compress the hose. Peristaltic pump b mainly includes a driver and a pump head. When the driver drives the pump head to rotate, the pump head compresses the drain hose, thereby pushing the fluid forward. By continuously changing the position of the pump head, the fluid forms a periodic peristaltic effect in the hose, achieving continuous fluid delivery. The matching structure of peristaltic pump b and the drain hose is existing technology and will not be elaborated further in this application.

[0084] In some possible implementations, such as Figure 1The pretreatment system 1 for water and dust removal includes an exhaust pipe 16 and an exhaust regulating valve 161 installed on the exhaust pipe 16. The sampling pump 15 is located upstream of the condenser 14. The exhaust pipe 16 is connected to the sampling pipeline 11 and is located between the sampling pump 15 and the condenser 14.

[0085] A tee can be installed on the sampling pipeline 11. The first port of the tee is connected to the sampling pump, the second opening of the tee is connected to the drain pipe 16, and the third opening of the tee is connected to the flow regulator a. The flow regulator a is located between the tee and the condenser 14.

[0086] The three-way valve divides the airflow drawn by the sampling pump 15 into two paths: one path enters the flow regulator a, and the other path enters the vent valve 161. By adjusting the vent valve 161 and the flow regulator a, the flow rate of the inlet flow meter is adjusted to 1 L / min, and the remaining flow is discharged through the vent valve 161. This ensures that the sampling pump 15 can promptly (within approximately 1-5 minutes) draw sample gas from the sampling port into the gas detection assembly, while ensuring that the flow rate is within the required range for the gas detection assembly (e.g., 1 L / min). It also reduces the water removal workload of the condenser 14, improves water removal efficiency, and extends the service life of all components.

[0087] In some possible implementations, such as Figure 1 As shown, the flow regulator a is located between the condenser 14 and the vent pipe 16. The flow regulator a can adjust the gas flow rate. By adjusting the flow regulator a, the flow rate required for the operation of the gas detection component (e.g., 1 L / min) can be maintained, and excess gas is discharged by the vent regulating valve 161.

[0088] In some possible implementations, such as Figure 1 As shown, the sampling pipeline 11 includes a sampling head 111, a sampling rod 112, and a main sampling pipeline 113. The sampling rod 112 is vertically arranged and has a length of approximately 8 to 11 meters. A lightning rod can be installed on the sampling rod 112. The sampling head 111 is located at the top of the sampling rod 112 and is equipped with the dust removal component. The main sampling pipeline 113 is connected to the bottom end of the sampling rod 112. The water removal component, the sampling pump 15, and the flow regulator a are all installed on the main sampling pipeline 113.

[0089] The air inlet of the sampling pipeline 11 is located at the top of the sampling rod 112, and the sampling head 111 is placed at a high position to reduce obstruction from surrounding tall buildings or trees. The sample gas is drawn into the sampling rod 112 from the air inlet and enters the main sampling pipeline, and finally enters the station building to be fed into the gas detection component for measurement and analysis.

[0090] In some possible implementations, the sampling head 111 includes an air inlet hood 1111 and an air duct 1112, the air duct 1112 connecting the air inlet hood 1111 and the top end of the sampling rod 112, and the dust removal assembly includes a filter screen 1111a disposed on the air inlet hood 1111 and a filter 1112a disposed on the air duct 1112.

[0091] The sampling pipeline 11 may include a curved section, and the air guide pipe 1112 is vertically arranged (i.e., approximately perpendicular to the horizontal plane). The air inlet hood 1111 has a wide opening and a narrow opening. The narrow opening of the air inlet hood 1111 connects to the air guide pipe 1112, and the wide opening of the air inlet hood 1111 faces downward. The filter screen 1111a covers the wide opening. The two ends of the curved section are respectively connected to the sampling rod 112 and the air guide pipe 1112. The filter 1112a on the air guide pipe 1112 can be a 5µm capsule filter, capable of filtering out trace amounts larger than 5µm.

[0092] The air intake hood 1111 has an inverted bell-shaped structure with a through hole at the top for installing and fixing the air guide pipe 1112. A pressure ring is provided on the wide-mouth side of the air intake hood 1111, pressing and fixing the filter screen 1111a between the pressure ring and the surface of the air intake hood 1111. The filter screen 1111a can be a stainless steel wire mesh. The air intake hood 1111 and the pressure ring can be connected and fixed with bolts, thereby pressing and fixing the peripheral edge of the filter screen 1111a. The mesh diameter of the filter screen 1111a is approximately 1mm, which can prevent debris with a diameter greater than 1mm from entering the air intake hood 1111, serving as the first dust barrier. At the same time, in this application, the inverted bell-shaped structure of the air intake hood 1111 effectively prevents rainwater from entering the sampling pipe 11, achieving a waterproof effect.

[0093] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A closed-loop greenhouse gas measurement system, characterized in that, include: A sampling pipeline, wherein a water removal component and a dust removal component are provided on the sampling pipeline; A closed-circuit instrument box, wherein a gas detection component is installed inside the closed-circuit instrument box; An air intake control box includes an ambient gas pipeline and a calibration gas pipeline. The air intake end of the ambient gas pipeline is connected to the sampling pipeline. The air outlet ends of both the ambient gas pipeline and the calibration gas pipeline are connected to the closed-loop instrument box. Solenoid valves are installed on both the ambient gas pipeline and the calibration gas pipeline. A controller is electrically connected to each of the solenoid valves, and the controller is used to control the opening and closing of each solenoid valve.

2. The closed-loop greenhouse gas measurement system according to claim 1, characterized in that, The calibration gas pipeline includes a low-concentration calibration gas pipeline, a high-concentration calibration gas pipeline, and a standard gas pipeline; The low-concentration standard gas pipeline is connected to a low-concentration standard gas source; The high-concentration standard gas pipeline is connected to a high-concentration standard gas source; The standard gas pipeline is connected to a standard gas source; Solenoid valves are installed on the low-concentration standard gas pipeline, the high-concentration standard gas pipeline, and the standard gas pipeline.

3. The closed-loop greenhouse gas measurement system according to claim 2, characterized in that, The solenoid valve on the ambient gas pipeline is a normally open solenoid valve. The solenoid valves on the low-concentration standard gas pipeline, the high-concentration standard gas pipeline, and the standard gas pipeline are normally closed solenoid valves.

4. The closed-circuit greenhouse gas measurement system according to claim 2, characterized in that, The air intake control box includes an output pipe, and the low-concentration standard gas pipeline, high-concentration standard gas pipeline, standard gas pipeline and ambient gas pipeline are all connected to the output pipe; The closed-circuit instrument box includes multiple branch lines, each of which is connected to the output pipe; The gas detection component includes multiple sensors; Each of the aforementioned sensors is installed in its respective shunt pipe.

5. The closed-circuit greenhouse gas measurement system according to claim 4, characterized in that, Each of the aforementioned sensors includes multiple CO2 sensors and one temperature, pressure, and humidity sensor; Each of the CO2 sensors and the temperature, pressure and humidity sensors is respectively installed in a shunt pipeline.

6. The closed-loop greenhouse gas measurement system according to claim 4, characterized in that, Each of the aforementioned branch lines is equipped with a flow regulator.

7. The closed-circuit greenhouse gas measurement system according to claim 4, characterized in that, It includes an industrial control computer, a camera device, a hard disk recorder, and a router, wherein the router is connected to the industrial control computer, the hard disk recorder, the camera device, and each of the sensors.

8. The closed-loop greenhouse gas measurement system according to any one of claims 1-7, characterized in that, A sampling pump is installed on the sampling pipeline, and the water removal component is located downstream of the dust removal component.

9. The closed-circuit greenhouse gas measurement system according to claim 8, characterized in that, Includes a drain pipe and a drain regulating valve installed on the drain pipe; The vent pipe is connected to the sampling pipeline and is located downstream of the sampling pump.

10. The closed-loop greenhouse gas measurement system according to claim 9, characterized in that, A flow regulator is installed on the sampling pipeline downstream of the drain pipe.

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