Flux real-time monitoring system based on ABB greenhouse gas closed-circuit analyzer

Abstract

The invention relates to the field of air detection, in particular to a flux real-time monitoring system based on an ABB greenhouse gas closed-circuit analyzer. The invention discloses a flux real-time monitoring system based on an ABB greenhouse gas closed-circuit analyzer. The flux real-time monitoring system comprises a gas analysis subsystem, a meteorological observation subsystem and a data acquisition and processing analysis subsystem, the gas analysis subsystem is responsible for measuring the concentration change of greenhouse gas, the meteorological observation subsystem is responsible for providing atmospheric background information, a complete, continuous and real-time flux monitoring system can be formed, the system can efficiently operate in a field environment, the flux of the greenhouse gas can be monitored and accurately calculated in real time, and the real-time performance of the system is improved. And long-term ecological system research and climate change monitoring are supported.

Description

Technical Field

[0001] The present invention relates to the field of air detection, and in particular to a flux real-time monitoring system based on an ABB greenhouse gas closed-circuit analyzer. Background Art

[0002] Climate change is one of the most pressing global environmental issues. The scientific community generally believes that greenhouse gases released by human activities, especially carbon dioxide (CO2) and methane (CH4), are the main cause of global warming. By monitoring the flux of these gases, scientists can better understand their concentration changes in the atmosphere, the dynamics of sources and sinks, and the response of the climate system to these changes.

[0003] Currently, other measurement methods have disadvantages such as intermittent measurement, poor spatial representativeness, strict assumptions, and interference with the ecosystem. Summary of the invention

[0004] In view of the above, the object of the present invention is to provide a real-time monitoring system for flux based on ABB greenhouse gas closed-circuit analyzer to address the above problems, which can accurately capture short-term and rapidly changing gas flux.

[0005] The solution is a real-time flux monitoring system based on ABB greenhouse gas closed-circuit analyzer, including gas analysis subsystem, meteorological observation subsystem, and data acquisition and processing analysis subsystem. The gas analysis subsystem is responsible for measuring the concentration changes of greenhouse gases, and the meteorological observation subsystem is responsible for providing atmospheric background information. Furthermore, the data acquisition and processing analysis subsystem is used to collect data from the gas analysis subsystem and the meteorological observation subsystem, and perform covariance calculation based on the data according to a built-in program to obtain gas flux results.

[0006] Furthermore, the gas analysis subsystem includes a greenhouse gas closed-circuit analyzer, a sampling pump, an air intake filtration system, and a flow control system; the air intake filtration system includes a capsule filter, and the flow control system includes an air intake flow meter, a regulating valve, a vacuum gauge, and a throttle valve. The capsule filter is connected to the air inlet of the air intake flow meter, the air outlet of the air intake flow meter is connected to the air inlet of the regulating valve, the air outlet of the regulating valve is connected to the air inlet of the greenhouse gas closed-circuit analyzer, the air outlet of the greenhouse gas closed-circuit analyzer is connected to the air inlet of the throttle valve, the air outlet of the throttle valve is connected to the air inlet end of the vacuum gauge, and the air outlet end of the vacuum gauge is connected to the air inlet of the sampling pump.

[0007] Furthermore, the meteorological observation unit is equipped with a three-dimensional ultrasonic anemometer, a temperature and humidity sensor, and an air pressure sensor.

[0008] Furthermore, the data acquisition and processing analysis subsystem includes a data collector and a GPS module.

[0009] Beneficial effects: (1) The data acquisition and processing analysis subsystem collects wind speed, gas concentration, temperature and humidity data at high frequency, and uses the data acquisition program to calculate the covariance of the collected turbulent wind speed data and the instantaneous change of gas concentration, and calculates the greenhouse gas flux data online. At the same time, the program can implement various correction steps to ensure that the final flux data is accurate and reliable, thereby improving calculation efficiency.

[0010] (2) By adjusting the components of the flow control system, the pump can be maintained at a reasonable working pressure while meeting the intake flow demand of the greenhouse gas closed-loop analyzer, preventing the pump from overheating and ensuring the service life of the pump.

[0011] (3) The air intake assembly can filter the air intake of the greenhouse gas closed-circuit analyzer, ensuring the air intake flow quality of the analyzer, making the analyzer chamber lens less likely to be contaminated, further adapting to harsh field monitoring environments, and reducing the maintenance cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the schematic diagram of this application; Figure 2 A schematic diagram of the working method of this application; DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] Reference Figure 1 to Figure 2 A real-time flux monitoring system based on ABB greenhouse gas closed-loop analyzer is shown.

[0015] The main function of the present invention is to measure and monitor the concentration changes of greenhouse gases.

[0016] The present invention includes a gas analysis subsystem responsible for measuring the concentration changes of greenhouse gases, such as CH4, CO2, and H2O.

[0017] The gas analysis subsystem includes a greenhouse gas closed-circuit analyzer, a sampling pump, an air intake filtration system, and a flow control system.

[0018] The air intake filtration system includes a capsule filter.

[0019] The flow control system includes an air intake flow meter, a regulating valve, a vacuum gauge, and a throttle valve. The capsule filter in the air intake filtration system is connected to the air inlet of the air intake flow meter through a 3 / 8" PTFE tube, the air outlet of the air intake flow meter is connected to the air inlet of the regulating valve through / 8" PTFE, and the air outlet of the regulating valve is connected to the air inlet of the greenhouse gas closed-circuit analyzer through an imperial 3 / 8" PTFE tube. The air outlet of the external pump of the greenhouse gas closed-circuit analyzer is connected to the air inlet of the throttle valve through a 1 / 2" silicone hose, the air outlet of the throttle valve is connected to the air inlet end of the vacuum gauge through a 1 / 2" silicone hose, the air outlet end of the vacuum gauge is connected to the air inlet of the sampling pump through a 1 / 2" silicone hose, and the air outlet of the sampling pump is connected to a muffler.

[0020] The present invention also includes a meteorological observation subsystem, which is responsible for measuring parameters related to meteorological conditions, providing atmospheric background information, and helping to perform flux calculation and data correction. It specifically includes: a three-dimensional ultrasonic anemometer, a temperature and humidity sensor, and an air pressure sensor. Among them, the three-dimensional ultrasonic anemometer measures the three components of wind speed (U, V, W), especially the wind speed W in the vertical direction, which is used for turbulence and flux calculation; the temperature and humidity sensor measures the temperature and humidity of the air, and participates in the temperature and water vapor flux correction in the gas flux; the air pressure sensor measures the atmospheric pressure, which helps to correct the gas concentration and calculate the flux.

[0021] The present invention also includes a data acquisition and processing analysis subsystem, which is responsible for collecting, storing and managing data from different sensors to ensure the time synchronization and spatial consistency of different source data. It specifically includes: a data collector and a GPS module. Among them, the data collector is responsible for high-frequency collection of data from sensors in the greenhouse gas closed-circuit analyzer and the meteorological observation subsystem, and based on the above data, performs covariance calculation according to the built-in program to obtain gas flux results, and performs data correction to ensure that the final flux data is accurate and reliable; the GPS module is responsible for providing accurate time and position synchronization.

[0022] The present invention also includes a power supply and communication subsystem, which is responsible for the stable power supply and data transmission of the entire monitoring system, including an AC power supply, a switching power supply, a UPS power supply, and a communication module. Among them, the AC power supply is responsible for providing stable AC power; the switching power supply is responsible for converting AC to DC power supply; the UPS power supply provides uninterrupted power supply to protect the equipment; and the communication module is responsible for remote data transmission.

[0023] The present invention provides a real-time flux monitoring system based on an ABB greenhouse gas closed-circuit analyzer, and its specific working method includes: 1. Data Collection and Synchronization 1.1 Data Collection Wind speed, temperature and humidity, atmospheric pressure and gas concentration data are collected in real time through three-dimensional wind speed sensors, temperature and humidity sensors, atmospheric pressure sensors and closed-circuit greenhouse gas analyzers.

[0024] 1.2 Time Synchronization Ensure that the data timestamps of all sensors are consistent to avoid errors caused by asynchrony.

[0025] 2 Data Preprocessing 2.1 Eliminating the observed values ​​during calibration Eliminate the observation data during the gas analyzer calibration period to prevent it from affecting the flux calculation.

[0026] 2.2 Removing Noise and Erroneous Data Detect and remove outliers and use smoothing methods to handle bad data.

[0027] 2.3 Data interpolation Fill in missing data to ensure data continuity and integrity.

[0028] 3. Correction Processing 3.1 Delay time correction Using flow monitoring, the delay time caused by the gas sample being transmitted in the pipeline is calculated in real time, and correction is applied to synchronize the gas concentration data with the wind speed signal.

[0029] 3.2 Coordinate rotation The wind speed tilt angle is corrected by a three-step rotation method to meet the calculation requirements of the vertical flux.

[0030] 3.3 Pipeline attenuation correction Calculate and compensate for the loss of high-frequency signals during pipeline transmission, and restore the actual fluctuation data of gas concentration.

[0031] 4 Flux calculation 4.1 Pulsation measurement Calculate the average and disturbance components of wind speed and gas concentration to obtain W' and C' 4.2 Eddy covariance method

[0032] The covariance of vertical wind speed and gas concentration was calculated and used to obtain preliminary flux values.

[0033] 4.3WPL Correction According to the ambient temperature, humidity and air pressure, the influence of air density change on gas concentration measurement is compensated to obtain the corrected flux value.

[0034] 5. Result analysis and output Output real-time flux data every half hour, perform time series analysis, and generate visual charts. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A real-time monitoring system for flux based on ABB greenhouse gas closed-circuit analyzer, characterized in that: Gas analysis subsystem, meteorological observation subsystem, data acquisition and processing analysis subsystem; the gas analysis subsystem is responsible for measuring the concentration changes of greenhouse gases, and the meteorological observation subsystem is responsible for providing atmospheric background information.

2. The real-time flux monitoring system based on the ABB greenhouse gas closed-circuit analyzer according to claim 1, characterized in that: The data acquisition and processing analysis subsystem is used to collect data from the gas analysis subsystem and the meteorological observation subsystem, and perform covariance calculation based on the data according to a built-in program to obtain gas flux results.

3. The real-time flux monitoring system based on the ABB greenhouse gas closed-circuit analyzer according to claim 1 is characterized in that: The gas analysis subsystem includes a greenhouse gas closed-circuit analyzer, a sampling pump, an air intake filtration system, and a flow control system; the air intake filtration system includes a capsule filter, and the flow control system includes an air intake flow meter, a regulating valve, a vacuum gauge, and a throttle valve. The capsule filter is connected to the air inlet of the air intake flow meter, the air outlet of the air intake flow meter is connected to the air inlet of the regulating valve, the air outlet of the regulating valve is connected to the air inlet of the greenhouse gas closed-circuit analyzer, the air outlet of the greenhouse gas closed-circuit analyzer is connected to the air inlet of the throttle valve, the air outlet of the throttle valve is connected to the air inlet end of the vacuum gauge, and the air outlet end of the vacuum gauge is connected to the air inlet of the sampling pump.

4. The real-time flux monitoring system based on the ABB greenhouse gas closed-circuit analyzer according to claim 1 is characterized in that: The meteorological observation station is equipped with a three-dimensional ultrasonic anemometer, temperature and humidity sensors, and air pressure sensors.

5. The real-time flux monitoring system based on the ABB greenhouse gas closed-circuit analyzer according to claim 1 is characterized in that: The data acquisition and processing analysis subsystem includes a data collector and a GPS module.

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