Greenhouse gas monitoring device and multi-source fusion monitoring system

Abstract

The utility model relates to the technical field of material absorption, in particular to a greenhouse gas monitoring device and a multi-source fusion monitoring system.The greenhouse gas monitoring device comprises an outer shell, an inner shell, a temperature compensation unit, a temperature detection unit and a first pump are arranged in the outer shell, a slow exhaust chamber is arranged in the inner shell, and an absorption tube and a comparison tube are arranged in the slow exhaust chamber in parallel; the sample inlet is communicated with a gas inlet of the absorption tube through the temperature compensation unit, and a gas outlet of the absorption tube is communicated with the slow discharge chamber through the first pump machine. The exhaust gas of the absorption tube is used for simultaneously regulating and controlling the temperatures of the absorption tube and the comparison tube from the outside, and the temperature compensation unit is matched for regulating the temperature of the sample gas source, so that the influence of the three-stage temperature gradient is eliminated in a short time, and the internal and external temperature difference of the absorption tube and the comparison tube is quickly shortened; the absorption tube and the comparison tube rapidly maintain the same detection temperature condition, so that the precision of a monitoring analysis result of the equipment on greenhouse gas is effectively improved, the monitoring analysis efficiency is improved, and the energy consumption of the equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of material absorption technology, and in particular to a greenhouse gas monitoring device and a multi-source fusion monitoring system. Background Technology

[0002] Greenhouse gases (such as CO2, CH4, N2O, etc.) are key drivers of global climate change. By monitoring greenhouse gas concentrations (such as the annual growth rate of CO2 and the seasonal variation of CH4) and their spatial distribution (such as the concentration differences in cities, industrial areas, and forests) over a long period of time, the contributions of natural carbon sinks (such as forests and oceans) and anthropogenic carbon sources (such as fossil fuel combustion and industrial emissions) can be quantified, revealing the transport and transformation patterns of greenhouse gases in the atmosphere (such as the source and sink distribution of CH4).

[0003] Currently, greenhouse gas monitoring has formed a three-dimensional monitoring network encompassing "space-air-ground-handheld" systems, covering various technologies such as satellite remote sensing, fixed ground stations, mobile monitoring, and handheld devices. Each technology has its unique advantages and application scenarios. Satellites typically retrieve the column concentration (total concentration from the Earth's surface to the top of the atmosphere) of greenhouse gases by receiving the absorption spectra of greenhouse gases at specific wavelengths of infrared light (such as the 1575nm band for CO2 and the 1650nm band for CH4). Fixed ground stations form the foundation of regional greenhouse gas monitoring. Through long-term, fixed-point observations, they acquire high-precision greenhouse gas concentration data. Specifically, they employ techniques such as non-dispersive infrared spectroscopy (NDIR), Fourier transform infrared spectroscopy (FTIR), and cavity ring-down spectroscopy (CRDS) to measure the absorption intensity of infrared light by greenhouse gases and retrieve their concentration.

[0004] In equipment used for greenhouse gas monitoring at ground-based fixed stations, an absorption cell and a control cell are typically installed to work together. The absorption cell monitors the greenhouse gas components, while the control cell provides a reference signal to eliminate instrument drift, environmental interference, and sample matrix effects, thus ensuring the reliability of the detection data. However, in the process of developing this application, the applicant discovered that the temperature consistency between the absorption cell and the control cell affects the accuracy of the measurement results. In actual testing, due to environmental factors and the temperature of the sample itself, it is difficult to quickly ensure temperature consistency between the absorption cell and the control cell in the early stages of testing, resulting in a decrease in the accuracy of greenhouse gas detection. Utility Model Content

[0005] The purpose of this application is to provide a greenhouse gas monitoring device and a multi-source fusion monitoring system to solve the aforementioned technical problems existing in the prior art.

[0006] This application is implemented as follows:

[0007] In a first aspect, this application provides a greenhouse gas monitoring device, including an outer shell, an inner shell, a temperature compensation unit, a temperature detection unit, and a first pump. The inner shell contains a slow-release chamber, in which an absorption tube and a comparison tube are arranged in parallel. The absorption tube is used to detect greenhouse gas components, and the comparison tube provides a reference signal to the absorption tube for calibration of the detection results. The outer shell has an inlet and an outlet. The inlet is connected to the inlet of the absorption tube via the temperature compensation unit, which adjusts the temperature of the passing greenhouse gas. The input of the first pump is connected to the exhaust port of the absorption tube, and the output of the first pump is connected to the slow-release chamber. The outlet is connected to the slow-release chamber pipeline. The temperature detection unit detects the temperatures inside the absorption tube and the comparison tube.

[0008] Furthermore, the exhaust port is disposed through the inner housing and is connected to the input end of the first pump through a first redundant pipe.

[0009] Furthermore, the output end of the first pump is connected to the slow discharge chamber through a second redundant pipe.

[0010] Furthermore, the first redundant pipe is a corrugated pipe or a flexible hose, and the second redundant pipe is a corrugated pipe or a flexible hose.

[0011] Furthermore, a light source is also provided inside the outer casing. The light source is used to provide light signals to the absorption tube and the contrast tube. The light source is connected to the first light signal output terminal of the first end cap on the absorption tube and the second light signal output terminal of the second end cap on the contrast tube through a light guide. A first detection unit is provided on the first end cap of the absorption tube, and a second detection unit is provided on the second end cap of the contrast tube. The first detection unit and the first light signal output terminal cooperate to realize the detection of greenhouse gas components. The second detection unit and the second light signal output terminal cooperate to realize the calibration of the detection results of the absorption tube.

[0012] Furthermore, a nitrogen source is provided inside the outer casing, the nitrogen source is connected to the comparison tube, and the outer casing is provided with an outlet connected to the comparison tube.

[0013] Furthermore, the temperature detection unit includes a first temperature sensor disposed on the exhaust port and a second temperature sensor disposed on the air outlet.

[0014] Furthermore, a dryer is also provided on the connecting pipeline between the sample inlet and the temperature compensation unit.

[0015] Furthermore, a second pump is also installed on the connecting pipeline between the injection port and the temperature compensation unit.

[0016] Secondly, this application provides a multi-source fusion monitoring system, including a server and the aforementioned greenhouse gas monitoring device. The server includes a first communication module and a second communication module. The first communication module is used for communication connection with the greenhouse gas monitoring device, and the second communication module is used for communication connection with a satellite.

[0017] The technical solution provided in this application can achieve the following beneficial effects:

[0018] This application utilizes the exhaust gas from the absorption tube to simultaneously regulate the temperature of both the absorption tube and the control tube from the outside. Combined with the temperature compensation unit to adjust the temperature of the sample gas source, it eliminates the influence of the three-stage temperature gradient in a short time, rapidly shortens the internal and external temperature difference between the absorption tube and the control tube, and allows the absorption tube and the control tube to quickly maintain the same detection temperature conditions. This effectively improves the accuracy of the equipment's monitoring and analysis results of greenhouse gases, increases the efficiency of greenhouse gas monitoring and analysis, and reduces equipment energy consumption. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the greenhouse gas monitoring device of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the greenhouse gas monitoring device of this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the greenhouse gas monitoring device of this utility model from another perspective;

[0023] Figure 4 This is a schematic diagram of the pipeline structure of the absorption tube and the comparison tube of this utility model;

[0024] Figure 5 This is a schematic diagram of the pipeline connection of the greenhouse gas monitoring device of this utility model;

[0025] Figure 6 This is a schematic diagram of the internal structure of the inner shell of this utility model;

[0026] Figure 7 This is a schematic diagram of the module connection of the multi-source fusion monitoring system of this utility model;

[0027] In the picture:

[0028] 10. Outer shell; 110. Sample inlet; 120. Sample outlet; 130. Gas outlet; 20. Inner shell; 210. Slow discharge chamber; 30. Absorption tube; 310. Gas inlet; 320. Gas outlet; 330. First head end cap; 340. First tail end cap; 350. Temperature compensation unit; 360. Dryer; 40. Comparison tube; 410. First temperature sensor; 420. Second temperature sensor; 430. Second head end cap; 440. Second tail end cap; 50. First pump; 60. Second pump; 70. Nitrogen source; 810. First redundant pipeline; 820. Second redundant pipeline; 830. Third redundant pipeline; 90. Light source; 910. Beam splitter; 200. Server; 300. Satellite. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] In existing greenhouse gas monitoring equipment, absorption and control cells are typically installed simultaneously within the equipment to improve the accuracy of greenhouse gas detection and analysis. However, the gas source for the control cell is usually located in a separate container installed inside the equipment casing, while the sample gas source comes from the environment outside the equipment casing. This not only creates a temperature difference between the gas in the absorption and control cells, but also easily forms a temperature gradient among the temperatures inside the control / absorption cell, inside the equipment casing, and outside the equipment casing. For example, in low-temperature environments during winter, the temperatures inside the control / absorption cell, inside the equipment casing, and outside the equipment casing decrease step by step, forming a three-level temperature gradient. This results in differences in the detection conditions between the absorption and control cells during operation, affecting the detection and analysis results of greenhouse gases. Even if a heater is installed in the equipment to adjust the temperature of the sample gas source, the adjustment has a certain lag, and the effects of the three-level temperature gradient are eliminated slowly, leading to a decrease in the accuracy of the detection and analysis results for a period of time after the detection begins. In view of this, this application provides a greenhouse gas monitoring device and a multi-source fusion monitoring system. The device utilizes the exhaust gas from the absorption tube to simultaneously regulate the temperature of both the absorption tube and the control tube from the outside. Combined with a temperature compensation unit to adjust the temperature of the sample gas source, the device can eliminate the influence of the three-level temperature gradient in a short time, rapidly shorten the internal and external temperature difference between the absorption tube and the control tube, and quickly maintain the same detection temperature conditions in both tubes. This effectively improves the accuracy of the monitoring and analysis results of greenhouse gases and increases the efficiency of greenhouse gas monitoring and analysis, as detailed in the following embodiments.

[0032] Example 1

[0033] This embodiment provides a greenhouse gas monitoring device, such as... Figures 1-3 As shown, it includes an outer casing 10, within which is an inner casing 20, a temperature compensation unit 350, a temperature detection unit, and a first pump 50. The inner casing 20 contains a slow-release chamber 210. Figure 6As shown, an absorption tube 30 and a comparison tube 40 are arranged in parallel within the slow-release chamber 210. The absorption tube 30 is used to detect greenhouse gas components, and the comparison tube 40 is used to provide a reference signal for the absorption tube 30 to calibrate the detection results of the absorption tube 30. The absorption tube 30 and the comparison tube 40 are existing technologies and can be used to monitor and analyze greenhouse gases through non-dispersive infrared spectroscopy (NDIR) or cavity ring-down spectroscopy (CRDS). In this embodiment, the absorption tube 30 preferably adopts a direct-through absorption cell based on non-dispersive infrared spectroscopy (NDIR). The comparison tube 40 and the absorption tube 30 are identical in structure except for the gas source being measured. The outer casing 10 is provided with an inlet 110 and an outlet 120. The inlet 110 is connected to the inlet 310 of the absorption tube 30 through a temperature compensation unit 350. The temperature compensation unit 350 is used to regulate the temperature of the passing greenhouse gas. The temperature compensation unit 350 is existing technology and can be an air conditioner, heater, or refrigeration unit, which will not be described in detail here. The input end of the first pump 50 is connected to the exhaust port 320 of the absorption tube 30, and the output end of the first pump 50 is connected to the slow discharge chamber 210. The outlet 120 is connected to the slow discharge chamber 210 through a pipeline. The temperature detection unit is used to detect the temperature inside the absorption tube 30 and the comparison tube 40.

[0034] Based on the above structure, when conducting greenhouse gas monitoring and analysis, such as Figure 4 and Figure 5As shown, sample gas is introduced into the absorption tube 30 through the inlet 110. The temperature detection unit measures the gas temperature in the absorption tube 30 and the comparison tube 40. When there is a temperature difference between the absorption tube 30 and the comparison tube 40, the temperature compensation unit 350 adjusts the temperature of the introduced sample gas to maintain the same temperature in the absorption tube 30 and the comparison tube 40. For example, when the sample gas temperature in the absorption tube 30 is lower than the gas temperature in the comparison tube 40, the temperature compensation unit 350 is activated to heat the sample gas, so that the heated sample gas has the same temperature as the gas in the comparison tube 40. At the same time, under the action of the first pump 50, the heated sample gas enters the slow discharge chamber 210 after passing through the absorption tube 30, replacing the... The original gas in the slow-release chamber 210 is filled with heated sample gas. At this time, the sample gas in the slow-release chamber 210 simultaneously exchanges heat with the absorption tube 30 and the control tube 40 from the outside, so that the ambient temperature of the absorption tube 30 and the control tube 40 and the internal ambient temperature of the absorption tube 30 and the control tube 40 are consistent. This not only effectively avoids the influence of the three-level temperature gradient caused by low temperature or high temperature environment, but also assists the temperature compensation unit 350 to accelerate the reduction of the gas temperature difference between the absorption tube 30 and the control tube 40, so that the absorption tube 30 and the control tube 40 can quickly maintain the same detection temperature conditions. This effectively improves the accuracy of the monitoring and analysis results of greenhouse gases, improves the monitoring and analysis efficiency of greenhouse gases, and reduces the energy consumption of the equipment.

[0035] To prevent the vibration of the first pump 50 from affecting the detection of the absorption tube 30, the exhaust port 320 can be configured to pass through the inner shell 20. The exhaust port 320 is connected to the input end of the first pump 50 through a first redundant pipe 810. Based on the design of the first redundant pipe 810, the vibration transmission between the first pump 50 and the absorption tube 30 can be effectively blocked, ensuring the stability of the greenhouse gas detection environment and thus helping to improve the detection and analysis accuracy of the equipment. In addition, based on the design of the exhaust port 320 passing through the inner shell 20, the absorption tube 30 can be pre-fixed by the exhaust port 320 and the inner shell 20 during equipment assembly, thereby reducing the difficulty of equipment assembly and manufacturing and reducing equipment production costs. The first redundant pipe 810 can be a corrugated pipe or a flexible hose; in this embodiment, a corrugated pipe is preferred.

[0036] To prevent the vibration of the first pump 50 from affecting the inner casing 20, the output end of the first pump 50 can be connected to the slow discharge chamber 210 through a second redundant pipe 820. The second redundant pipe 820 effectively blocks the vibration transmission between the first pump 50 and the inner casing 20, ensuring the stability of greenhouse gas detection conditions. The second redundant pipe 820 is a corrugated pipe or a flexible hose; in this embodiment, a corrugated pipe is preferred.

[0037] Specifically, the housing 10 also includes a light source 90, which provides detection light signals to the absorption tube 30 and the contrast tube 40. The light source 90 is connected via a light guide to the first light signal output terminal of the first end cap 330 on the absorption tube 30 and the second light signal output terminal of the second end cap 430 on the contrast tube 40. A first detection unit is provided on the first end cap 340 of the absorption tube 30, and a second detection unit is provided on the second end cap 440 of the contrast tube 40. The first detection unit and the first light signal output terminal cooperate to detect greenhouse gas components, and the second detection unit and the second light signal output terminal cooperate to calibrate the detection results of the absorption tube 30. The first and second detection units are existing technologies and can be photoacoustic spectroscopy (PAS) sensors, non-dispersive infrared (NDIR) sensors, tunable semiconductor laser (TDLAS) sensors, or photoionization (PID) sensors. This embodiment preferably uses a non-dispersive infrared (NDIR) sensor.

[0038] Specifically, the light signal generated by the light source 90 can be split into two identical light signals by the beam splitter 910. The two light signals are transmitted to the first light signal output end of the absorption tube 30 and the second light signal output end of the contrast tube 40 through the light guide, respectively, so as to ensure that the detection conditions of the absorption tube 30 and the contrast tube 40 are the same.

[0039] Specifically, a nitrogen source 70 is provided inside the outer casing 10, and the nitrogen source 70 is connected to the comparison tube 40. The outer casing 10 is provided with an outlet 130 connected to the comparison tube 40. Nitrogen gas is introduced into the comparison tube 40 through the nitrogen source 70 to eliminate interference from oxygen or moisture. In some embodiments, a CO2 gas source and a CH4 gas source can also be provided inside the outer casing 10, and the CO2 gas source and CH4 gas source are respectively connected to the comparison tube 40 to facilitate zero-point calibration.

[0040] Specifically, to facilitate determining the temperature adjustment target of the temperature compensation unit 350 for the sample gas, the temperature detection unit can be configured to include a first temperature sensor 410 located on the exhaust port 320 and a second temperature sensor 420 located on the outlet port. The first temperature sensor 410 is used to detect the temperature of the sample gas in the absorption tube 30, and the second temperature sensor 420 is used to detect the temperature of the gas in the comparison tube 40. Then, based on the difference between the two temperature detection values, the temperature adjustment target of the temperature compensation unit 350 for the sample gas is determined. For example, if the temperature of the sample gas in the absorption tube 30 is 16°C and the temperature of the gas in the comparison tube 40 is 24°C, it can be determined that the temperature compensation unit 350 heats the sample gas to 24°C. Subsequently, when the sample gas enters the slow exhaust chamber 210, the absorption tube 30 and the comparison tube 40 can be kept in an environment of 24°C at the same time, avoiding the influence of the temperature difference between the inside and outside of the absorption tube 30 and the comparison tube 40 on the detection results.

[0041] In some embodiments, to reduce the interference of water vapor on infrared absorption (e.g., H2O has a strong absorption peak in the near-infrared region) and to avoid the risk of water vapor condensing and damaging optical components in the detection pipeline, a dryer 360 can be installed on the connecting pipeline between the sample inlet 110 and the temperature compensation unit 350. The dryer 360 is used to remove water vapor from the sample gas entering the absorption tube 30, thereby improving detection accuracy and reducing the risk of equipment damage.

[0042] In some embodiments, to facilitate the introduction of sample gas into the absorption tube 30, a second pump 60 can be installed on the connecting pipe between the inlet 110 and the temperature compensation unit 350, and the second pump 60 can be used to drive the sample gas through the temperature compensation unit 350 into the absorption tube 30; preferably, the first pump 50 and the second pump 60 can be set to coordinately regulate the gas pressure inside the absorption tube 30.

[0043] In some embodiments, the temperature compensation unit 350 can be connected to the absorption pipe 30 through a third redundant pipe 830, and the air inlet 310 of the absorption pipe 30 is provided through the inner housing 20, so as to avoid the influence of the temperature compensation unit 350 on the absorption pipe when it is working, and at the same time reduce the difficulty of equipment assembly.

[0044] Example 2

[0045] This embodiment provides a multi-source fusion monitoring system, such as Figure 7 As shown, the system includes a server 200 and the greenhouse gas monitoring device from Embodiment 1. The server 200 includes a first communication module and a second communication module. The first communication module is used for communication connection with the greenhouse gas monitoring device, and the second communication module is used for communication connection with the satellite 300. The greenhouse gas monitoring device monitors greenhouse gases on the ground, while the satellite 300 monitors greenhouse gases from the air. The satellite monitoring data addresses the problem of limited coverage of ground monitoring, and the ground monitoring data addresses the problem of low resolution of satellite monitoring. The monitoring data obtained from both methods are transmitted to the server 200 for storage via the first and second communication modules. This allows for subsequent multi-source fusion monitoring and analysis of greenhouse gases. By using data assimilation algorithms (such as the Ensemble Kalman Filter), the macroscopic trends from the satellite are combined with local details from the ground, improving the overall inversion accuracy.

[0046] It should be noted that the first communication module and the second communication module are existing technologies. The first communication module can achieve communication between the server and the greenhouse gas monitoring device through wired networks (fiber optic / Ethernet), cellular networks (4G / 5G / NB-IoT), or low-power wide area networks (LoRaWAN). The second communication module can achieve communication between the server and the satellite through VSAT system and satellite IoT technology. Using satellite to obtain greenhouse gas data is also an existing technology and will not be elaborated here.

[0047] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this application.

Claims

1. A greenhouse gas monitoring device, characterized in that, The device includes an outer shell, within which are an inner shell, a temperature compensation unit, a temperature detection unit, and a first pump. The inner shell contains a slow-release chamber, within which an absorption tube and a comparison tube are arranged in parallel. The absorption tube is used to detect greenhouse gas components, and the comparison tube provides a reference signal to the absorption tube for calibration of the detection results. The outer shell has an inlet and an outlet. The inlet is connected to the inlet of the absorption tube via the temperature compensation unit, which regulates the temperature of the passing greenhouse gases. The input of the first pump is connected to the exhaust port of the absorption tube, and the output of the first pump is connected to the slow-release chamber. The outlet is connected to the slow-release chamber piping. The temperature detection unit detects the temperatures inside the absorption tube and the comparison tube.

2. The greenhouse gas monitoring device according to claim 1, characterized in that, The exhaust port is disposed through the inner shell and is connected to the input end of the first pump through a first redundant pipe.

3. A greenhouse gas monitoring device according to claim 2, characterized in that, The output end of the first pump is connected to the slow discharge chamber through a second redundant pipe.

4. A greenhouse gas monitoring device according to claim 3, characterized in that, The first redundant pipe is a corrugated pipe or a flexible hose, and the second redundant pipe is a corrugated pipe or a flexible hose.

5. A greenhouse gas monitoring device according to any one of claims 1 to 4, characterized in that, The housing also contains a light source, which provides light signals to the absorption tube and the contrast tube. The light source is connected to the first light signal output terminal of the first end cap on the absorption tube and the second light signal output terminal of the second end cap on the contrast tube via a light guide. The first end cap of the absorption tube is provided with a first detection unit, and the second end cap of the contrast tube is provided with a second detection unit. The first detection unit and the first light signal output terminal cooperate to realize the detection of greenhouse gas components, and the second detection unit and the second light signal output terminal cooperate to realize the calibration of the detection results of the absorption tube.

6. A greenhouse gas monitoring device according to claim 5, characterized in that, A nitrogen source is provided inside the outer casing, and the nitrogen source is connected to a comparison tube. An outlet connected to the comparison tube is provided on the outer casing.

7. A greenhouse gas monitoring device according to claim 6, characterized in that, The temperature detection unit includes a first temperature sensor located on the exhaust port and a second temperature sensor located on the outlet port.

8. A greenhouse gas monitoring device according to any one of claims 1 to 4, characterized in that, A dryer is also installed on the connecting pipeline between the sample inlet and the temperature compensation unit.

9. A greenhouse gas monitoring device according to claim 8, characterized in that, A second pump is also installed on the connecting pipeline between the injection port and the temperature compensation unit.

10. A multi-source fusion monitoring system, characterized in that, The device includes a server and a greenhouse gas monitoring device according to any one of claims 1 to 9. The server includes a first communication module and a second communication module. The first communication module is used to communicate with the greenhouse gas monitoring device, and the second communication module is used to communicate with a satellite.

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