Device and Method for Measuring Carbon Dioxide Concentration in Sewage Inspection Well Based on Electrochemical Trapping Technology

Abstract

A device and method for measuring the CO₂ concentration in a sewage inspection well based on electrochemical capture technology, belonging to the technical field of sewage treatment and environmental protection; the device and method aim to solve the problem that the CO₂ concentration in the drainage inspection well is thin and varies greatly, making it difficult for conventional equipment to accurately measure; the device includes a housing, a display screen, control buttons, an air intake hose, an intake fan, a porous electrolyte, electrodes, etc., and calculates the average CO₂ concentration by the principle of electrochemical capture and using the air volume and electrolyte saturation time; the present invention realizes the accurate measurement of the internal CO₂ concentration outside the inspection well, with simple and safe operation, low cost, and provides a scientific and reliable measurement method for carbon emission reduction in the drainage system; this device is exquisitely designed, not only improving the measurement accuracy, but also realizing remote monitoring and data analysis through the wireless data transmission function, providing an efficient management tool for environmental protection departments and sewage treatment plants, and promoting the realization of the green emission goal.

Description

Technical Field

[0001] The present invention relates to the technical fields of sewage treatment, environmental monitoring, and gas detection, and particularly to a device and method for measuring the carbon dioxide concentration in a sewage inspection well based on an electrochemical capture technology. Background Art

[0002] In the technical fields of sewage treatment and environmental protection, the accurate monitoring of the carbon dioxide (CO2) concentration in a drainage inspection well is an important link for evaluating the operation status of a sewage treatment system, optimizing the operation strategy, and achieving the carbon emission reduction goal. However, due to the characteristics of uneven spatial distribution and large temporal variation of the CO2 concentration in the drainage inspection well, it is difficult for traditional CO2 detection devices to obtain accurate and stable measurement results.

[0003] Traditional methods for measuring the CO2 concentration mostly rely on sensor technologies, such as infrared absorption method, electrochemical sensor method, etc. Although these methods can achieve the measurement of the CO2 concentration to a certain extent, they often have problems such as slow response speed, low measurement accuracy, and susceptibility to interference when facing the complex and changeable environmental conditions in the drainage inspection well. Especially when the CO2 concentration in the inspection well is thin and fluctuates greatly, it is difficult for traditional sensors to accurately capture and reflect its true concentration level.

[0004] For example, CN103175803A discloses a method for detecting the carbon dioxide concentration with self-calibration using non-dispersive infrared. A method for detecting the carbon dioxide concentration with self-calibration using non-dispersive infrared is implemented by using a non-dispersive infrared detector. The non-dispersive infrared detection part includes an infrared light source, a single-window detector, a gold-plated gas chamber, and a data collector. A temperature sensor is provided in the single-window detector, and a buffer and a register are provided in the data collector. Its self-calibration feature is that it is carried out in three steps: preparation, self-calibration data processing, and temperature compensation. The measurement of the present invention is accurate and reliable, has strong anti-interference ability, and good long-term working stability; however, there are still problems such as slow response speed, low measurement accuracy, susceptibility to interference, and difficulty in accurately capturing and reflecting its true concentration level when the CO2 concentration in the well is thin and fluctuates greatly.

[0005] In addition, most of the existing CO2 concentration measurement devices have disadvantages such as large volume, complex operation, and high cost, which are not convenient for rapid and effective measurement in small spaces such as drainage inspection wells. This not only increases the work difficulty and safety risk of operators, but also limits the popularization and application scope of CO2 concentration monitoring.

[0006] To overcome the above technical problems, the present invention proposes a device and method for measuring the CO2 concentration in a sewage inspection well based on an electrochemical capture technology. The device uses the electrochemical capture technology to accurately measure the average CO2 concentration in the inspection well by monitoring the time when the electrochemical capture device adsorbs CO2 to saturation and combining the intake air volume of the intake fan. This method can not only effectively solve the problem that traditional sensors are difficult to accurately measure the CO2 concentration in drainage inspection wells, but also has the advantages of simple and portable device, easy operation, low cost, etc., and has broad application prospects and promotion value.

[0007] In summary, the present invention is proposed based on a profound understanding of the deficiencies of the existing technology and an accurate grasp of the market demand. By introducing the electrochemical capture technology, the present invention provides a new solution for the accurate monitoring of the CO2 concentration in drainage inspection wells, which is of great significance for improving the operation efficiency of the sewage treatment system and achieving the carbon emission reduction goal. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a device and method for measuring the carbon dioxide concentration in a sewage inspection well based on an electrochemical capture technology, to solve the problem that traditional sensors are difficult to accurately measure the CO2 concentration in drainage inspection wells, and the existing measurement technologies have slow response speed, low measurement accuracy, are easily interfered, and most of the measurement devices are large in volume, complex in operation and high in cost.

[0009] To solve the above technical problems, the technical solution adopted by the present invention is: A device for measuring the CO2 concentration in a sewage inspection well based on an electrochemical capture technology, comprising:

[0010] A handheld measurement device housing, on which or inside which a display screen, a control button and a controller are installed, and an exhaust gas outlet and a sealing ring are installed on its outside;

[0011] An air suction device, comprising a suction hose fixed below the sealing ring and connected to the inside of the measurement device housing, a suction head housing is arranged at the lower part of the suction hose, an air inlet hole is arranged at the front end of the suction head housing, and an intake fan is installed therein, which is fixed in the suction head housing by a fan bracket for sucking the gas in the inspection well at a constant flow rate;

[0012] An electrochemical capture and adsorption device, comprising an electrochemical capture unit housing installed in the measurement device housing, one end of the electrochemical capture unit housing is communicated with the suction hose, the other end is communicated with the exhaust gas outlet through a gas guide pipe, a porous electrolyte is installed in the electrochemical capture unit housing, an electrode is arranged in the porous electrolyte, and the electrode is connected to a potentiometer through a wire, and the potentiometer transmits the measured potential signal to the controller.

[0013] In a preferred embodiment, the display screen and the operation buttons are arranged on the front of the housing of the measuring device, for displaying the measurement results and operating the internal system of the measuring device; the exhaust gas outlet is installed on the upper part of the housing of the measuring device, for discharging the exhaust gas without CO2 and releasing the trapped CO2.

[0014] In a preferred embodiment, the suction hose and the housing of the suction head are made of a flexible material, and the sealing ring is made of a flexible sealing material, for sealing the gap between the suction hose and the housing of the measuring device.

[0015] In a preferred embodiment, the porous electrolyte is made of a CO2 adsorption medium, so that the CO2 in the gas stream is adsorbed when passing through, and is released after a voltage is applied to the electrode; the controller judges the CO2 adsorption saturation degree according to the potential signal transmitted by the potentiometer, records the time from the start of adsorption to adsorption saturation, and calculates the average CO2 concentration in the gas stream according to the built-in calculation formula.

[0016] In a preferred embodiment, the measuring device further includes a rechargeable battery, which is electrically connected to the display screen, the operation buttons, the controller, the potentiometer, the intake fan and the electrochemical capture and adsorption device for power supply, and supplies power to the electrode during the CO2 release process.

[0017] A method for measuring the CO2 concentration in a sewage inspection well based on electrochemical capture technology uses a device for measuring the CO2 concentration in a sewage inspection well based on electrochemical capture technology as described in any one of the above, and the method includes the following steps:

[0018] Step1: Charging, charging the rechargeable battery.

[0019] Step2: Placing the device, holding the measuring device beside the inspection well, and putting the air duct and the suction head into the position to be measured in the inspection well.

[0020] Step3: Starting the measurement, starting the intake fan, and the gas in the inspection well enters the electrochemical capture device at a constant flow rate and recording the start time ;

[0021] Step4: Adsorption process, the CO2 in the gas stream is adsorbed by the porous electrolyte, causing a change in the potential between the electrodes. The potential between the electrodes is measured by the potentiometer, and the adsorption process is monitored by the controller.

[0022] Step5: Ending the measurement, when the controller monitors the end of the adsorption process, record the time and turn off the intake fan, calculate the average CO2 concentration through the built-in calculation formula and display it;

[0023] Step 6: After the measurement of CO₂ release is completed, the controller controls the rechargeable battery to apply a voltage to the electrode to release the adsorbed CO₂ in the porous electrolyte, so that the device returns to its initial state.

[0024] In a preferred embodiment, the built-in calculation formula for calculating the average CO₂ concentration after the end of Step 5 is:

[0025] (1)

[0026] In the formula, is the saturated adsorption capacity of the electrolyte; is the preset air flow rate of the device; is the end time of the adsorption process; is the start time when the device starts to work; is the average CO₂ concentration in the air.

[0027] In a preferred embodiment, the measurement method is to calculate the average CO₂ concentration in the inspection well by measuring the time for the electrochemical capture device to adsorb CO₂ to saturation and combining the air intake volume of the intake fan.

[0028] In a preferred embodiment, the model parameter calibration process in Step 5 includes using hydrographic and water quality monitoring data for parameter adjustment to ensure the accuracy and reliability of the model.

[0029] The carbon dioxide concentration measuring device and method in a sewage inspection well based on the electrochemical capture technology provided by the present invention have the following beneficial effects:

[0030] 1. The present invention solves the problems that traditional sensors are difficult to accurately measure the CO₂ concentration in drainage inspection wells, and the measurement technologies in the prior art have slow response speed, low measurement accuracy, are easily interfered, and most of the measurement devices are large in volume, complex in operation, and high in cost;

[0031] 2. The present invention adopts the electrochemical capture method to measure the CO₂ concentration in the inspection well, which can effectively solve the problem that it is difficult for traditional CO₂ sensors to accurately measure its average concentration due to the uneven spatial distribution and large temporal variation of the CO₂ concentration in the inspection well, and provides a scientific and reliable measurement method for the measurement of the CO₂ concentration in the gas in the drainage inspection well or other similar scenarios;

[0032] 3. The device of the present invention is simple and portable, and the operator can measure the CO₂ concentration inside the inspection well deeply outside the inspection well, which is very convenient and safe for the application in the monitoring of greenhouse gas emissions in the drainage network;

[0033] 4. The present invention realizes the accurate measurement of the CO₂ concentration in the inspection well through the electrochemical capture technology, and solves the problem that it is difficult for traditional CO₂ sensors to accurately measure the thin and large-variation CO₂ concentration;

[0034] 5. The device of the present invention has a simple and lightweight structure, is convenient and safe to operate, and is applicable to various scenarios such as greenhouse gas emission monitoring in drainage pipe networks. At the same time, the technical principle is simple and reliable, the cost is low, and it has the potential for large-scale popularization and use.

[0035] 6. The present invention also has a self-calibration function, which can regularly and automatically adjust the reference value to ensure long-term measurement accuracy. In addition, the device is built-in with a data recording and transmission module, which supports remote monitoring and data analysis, providing strong support for the intelligent management of urban drainage systems and the reduction of pollution and carbon emissions in drainage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the drawings and embodiments:

[0037] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 is an assembly schematic diagram of the electrochemical capture and adsorption device and the housing of the measurement device of the present invention;

[0039] In the figure: housing 1 of the measurement device, exhaust gas outlet 2, display screen 3, control button 4, sealing ring 5, suction hose 6, suction head 7, intake hole 8, intake fan 9, fan bracket 10, porous electrolyte 11, controller 12, air duct 13, rechargeable battery 14, housing 15 of the electrochemical capture unit, electrode 16, wire 17, potentiometer 18. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The technical solutions in the present invention will be further described below in conjunction with the drawings and embodiments:

[0041] Embodiment 1

[0042] As Figures 1 - 2 shown, a device for measuring the CO2 concentration in a sewage inspection well based on electrochemical capture technology includes:

[0043] A handheld housing 1 of the measurement device, on which or inside which a display screen 3, a control button 4 and a controller 12 are installed, and an exhaust gas outlet 2 and a sealing ring 5 are installed on its outside;

[0044] An air suction device, including a suction hose 6 fixed below the sealing ring 5 and connected to the inside of the housing 1 of the measurement device, a suction head housing 7 is arranged at the lower part of the suction hose 6, an intake hole 8 is arranged at the front end of the suction head housing 7, and an intake fan 9 is installed therein and fixed in the suction head housing 7 through a fan bracket 10 for sucking the gas in the inspection well at a constant flow rate;

[0045] Electrochemical capture adsorption device, including an electrochemical capture unit housing 15 installed in the measuring device housing 1. One end of the electrochemical capture unit housing 15 is connected to the suction hose 6, and the other end is connected to the exhaust gas outlet 2 through the air duct 13. A porous electrolyte 11 is installed inside the electrochemical capture unit housing 15, and an electrode 16 is arranged inside the porous electrolyte 11. The electrode 16 is connected to the potentiometer 18 through a wire 17, and the potentiometer 18 transmits the measured potential signal to the controller 12.

[0046] In this embodiment, the display screen 3 and the operation buttons 4 are arranged on the front of the measuring device housing 1, used for displaying the measurement results and operating the internal system of the measuring device; the exhaust gas outlet 2 is installed on the upper part of the measuring device housing 1, used for discharging the exhaust gas without CO2 and releasing the captured CO2.

[0047] Furthermore, the suction hose 6 and the suction head housing 7 are made of soft materials, and the sealing ring 5 is made of soft sealing materials, used for sealing the gap between the suction hose 6 and the measuring device housing 1.

[0048] Furthermore, the porous electrolyte 11 is made of a CO2 adsorption medium, so that the CO2 in the air flow is adsorbed when passing through, and is released after applying a voltage to the electrode 16; the controller 12 judges the CO2 adsorption saturation degree according to the potential signal transmitted by the potentiometer 18, records the time from the start of adsorption to adsorption saturation, and calculates the average CO2 concentration in the air flow according to the built-in calculation formula.

[0049] Furthermore, the measuring device further includes a rechargeable battery 14, which is electrically connected to the display screen 3, the operation buttons 4, the controller 12, the potentiometer 18, the intake fan 9 and the electrochemical capture adsorption device for power supply, and supplies power to the electrode 16 during the CO2 release process.

[0050] Embodiment 2

[0051] In another preferred embodiment, based on the above Embodiment 1, a method for measuring the CO2 concentration in a sewage inspection well based on electrochemical capture technology is to use the device for measuring the CO2 concentration in a sewage inspection well based on electrochemical capture technology described in any one of the above. The method includes the following steps:

[0052] Step1: Charge, charge the rechargeable battery 14.

[0053] Step2: Place the device, hold the measuring device beside the inspection well, and put the air duct 13 and the suction head into the position to be measured in the inspection well.

[0054] Step3: Start measurement, start the intake fan 9, and the gas in the inspection well enters the electrochemical capture device at a constant flow rate and record the start time ;

[0055] Step4: Adsorption process. CO2 in the air flow is adsorbed by the porous electrolyte 11, causing a change in the potential between the electrodes 16. The potential between the electrodes is measured by the potentiometer 18 and the adsorption process is monitored by the controller 12;

[0056] Step5: End the measurement. When the controller 12 monitors the end of the adsorption process, record the time , and turn off the intake fan 9. Calculate and display the average CO2 concentration through the built-in calculation formula;

[0057] Step6: Release CO2. After the measurement is completed, the controller 12 controls the rechargeable battery 14 to apply a voltage to the electrodes 16 to release the CO2 adsorbed in the porous electrolyte 11, returning the device to its initial state.

[0058] In this embodiment, the built-in calculation formula for calculating the average CO2 concentration after Step5 ends the measurement is:

[0059] (1)

[0060] In the formula, is the saturated adsorption capacity of the electrolyte; is the preset air flow rate of the device; is the end time of the adsorption process; is the start time of the device working; is the average CO2 concentration in the air.

[0061] Furthermore, the measurement method is to calculate the average CO2 concentration in the inspection well by measuring the time for the electrochemical capture device to adsorb CO2 to saturation and combining the intake air volume of the intake fan.

[0062] Embodiment 3

[0063] In another preferred embodiment, based on the above Embodiments 1 and 2, a CO2 concentration measuring device in a sewage inspection well based on electrochemical capture technology has a specific structure as shown in Figure 1 and Figure 2 shown. The device mainly consists of components such as a measurement device housing 1, an exhaust gas outlet 2, a display screen 3, a control button 4, a sealing ring 5, an inhalation hose 6, an inhalation head housing 7, an air inlet 8, an intake fan 9, a fan bracket 10, a porous electrolyte 11, a controller 12, a gas guide pipe 13, a rechargeable battery 14, an electrochemical capture unit housing 15, electrodes 16, wires 17, a potentiometer 18, etc.

[0064] 1. The assembly and structure of the measurement device are described as follows:

[0065] Measurement device housing 1: It is made of lightweight materials, small and portable in size, and easy to hold. On the front of the housing, there is a display screen 3 and control buttons 4 for displaying measurement results and operating the device. On the upper part of the housing, there is an exhaust gas outlet 2 for discharging CO2-free exhaust gas and desorbed CO2. On the lower part, there is a sealing ring 5 and an inhalation hose 6. The sealing ring 5 is made of a soft sealing material to ensure the airtightness of the connection between the inhalation hose 6 and the housing.

[0066] Inhalation device: It includes an inhalation hose 6, an inhalation head housing 7, an air inlet hole 8, an intake fan 9, and a fan bracket 10. The inhalation head housing 7 is provided with an air inlet hole 8 for guiding the gas in the inspection well to enter. The intake fan 9 is installed on the fan bracket 10 and fixed inside the inhalation head housing 7, and inhales the gas in the inspection well into the measurement device interior at a constant air flow rate through suction force.

[0067] Electrochemical capture and adsorption device: It includes a porous electrolyte 11, a controller 12, a gas guide pipe 13, a rechargeable battery 14, an electrochemical capture unit housing 15, an electrode 16, a wire 17, and a potentiometer 18. Inside the electrochemical capture unit housing 15, a porous electrolyte 11 and an electrode 16 are installed. The porous electrolyte 11 is made of a CO2 adsorption medium and can adsorb CO2 when the air flow passes through. The electrode 16 is connected to the wire 17, monitors the potential change between the electrodes through the potentiometer 18, and transmits the signal to the controller 12. The controller 12 judges the progress state of the adsorption reaction according to the potential signal and controls the entire electrochemical capture process.

[0068] 2. The working process of the measurement method is as follows:

[0069] Preparation stage: The operator first charges the rechargeable battery 14 to ensure that the device has sufficient power supply. Then, hold the measurement device beside the inspection well and put the inhalation head (including the air inlet hole 8, the intake fan 9, and the inhalation hose 6) into the position to be measured in the inspection well.

[0070] Measurement stage: Press the control button 4 to start the measurement device, and the intake fan 9 starts to work. The gas in the inspection well enters the inhalation hose 6 at a constant flow rate through the air inlet hole 8, and then enters the electrochemical capture device through the gas guide pipe 13. At this time, the time is recorded as the measurement start time. The CO2 in the air flow is adsorbed by the porous electrolyte 11, and at the same time, the potential between the electrodes 16 changes. The potentiometer 18 monitors and transmits the potential signal to the controller 12 in real time.

[0071] Data processing and display: When the controller 12 monitors the end of the adsorption process, record the time , and turn off the intake fan 9. According to the built-in calculation formula , the controller calculates the average concentration of CO2 in the inspection well and display the result on the display screen 3.

[0072] Desorption and recovery: After the measurement is completed, the controller 12 controls the rechargeable battery 14 to apply a voltage to the electrode 16, prompting the porous electrolyte 11 to release the adsorbed CO2; the released CO2 and the waste gas without CO2 are discharged from the waste gas discharge port 2, restoring the device to its initial state and preparing for the next measurement.

[0073] Through the innovative electrochemical capture technology and delicate device design of the present invention, the components of the device work together to jointly achieve the accurate measurement of the CO2 concentration in the inspection well; successfully solve the problems in the measurement of the CO2 concentration in the drainage inspection well, provide strong support for the carbon emission reduction and environmental monitoring work of the drainage system, and also provide ideas for the CO2 concentration measurement in similar scenarios.

[0074] In a preferred embodiment, the display screen 3 and the operation button 4 are arranged on the front of the measurement device housing 1, used to display the measurement result and operate the internal system of the measurement device; the waste gas discharge port 2 is installed on the upper part of the measurement device housing 1, used to discharge the waste gas without CO2 and release the captured CO2; the above settings not only improve the convenience of user operation and intuitively display the measurement status, but also ensure the safety and environmental protection of waste gas treatment, effectively prevent the leakage of harmful gases, and protect the safety and health of the operation environment.

[0075] In a preferred embodiment, the suction hose 6 and the suction head housing 7 are made of soft materials, and the sealing ring 5 is made of soft sealing materials, used to seal the gap between the suction hose 6 and the measurement device housing 1; the above settings ensure the airtightness, and the selection of soft materials also enhances the durability and anti-aging performance of the product, extending the service life. At the same time, the length of the intake hose can be adjusted by the operator according to the actual situation of the measurement site by means of connecting pipes to cope with the complex situation at the operation site and improve the applicability of the equipment.

[0076] In a preferred embodiment, the porous electrolyte 11 is made of a CO2 adsorption medium, so that the CO2 in the air flow is adsorbed when passing through and released after a voltage is applied to the electrode 16; the controller 12 judges the CO2 adsorption saturation degree according to the potential signal transmitted by the potentiometer 18, records the time from the start of adsorption to adsorption saturation, and calculates the average CO2 concentration in the air flow according to the built-in calculation formula; the above settings avoid the measurement errors caused by the thin and fluctuating CO2 concentration in the inspection well, effectively improve the accuracy and efficiency of CO2 detection, and at the same time reduce the energy consumption and cost in the detection process; in addition, by optimizing the pore structure and material selection of the electrolyte, the selective adsorption ability of CO2 is further enhanced, ensuring the stability and reliability of the detection result.

[0077] In a preferred embodiment, the measuring device further includes a rechargeable battery 14, which is electrically connected to the display screen 3, the operation button 4, the controller 12, the potentiometer 18, the intake fan 9 and the electrochemical capture and adsorption device to supply power, and supplies power to the electrode 16 during the CO2 release process; the above settings not only ensure the long-term operation of the device in a mobile or external power-free environment, but also optimize the power distribution through intelligent power management, extend the usage time of a single charge, and improve the overall usage efficiency and portability.

[0078] In a preferred embodiment, the measuring method is to calculate the average concentration of CO2 in the inspection well by measuring the time when the electrochemical capture device adsorbs CO2 to saturation and combining the intake air volume of the intake fan; the above settings can achieve rapid and accurate monitoring of the CO2 concentration in the inspection well to ensure operation safety; at the same time, this method is easy to operate and does not require complex equipment, and is suitable for detection requirements under various environmental conditions.

[0079] In summary, the present invention provides a device and method for measuring the carbon dioxide concentration in a sewage inspection well based on an electrochemical capture technology, which solves the problems that traditional sensors are difficult to accurately measure the CO2 concentration in a drainage inspection well, and the measurement technologies in the prior art have slow response speed, low measurement accuracy, are easily interfered, and most of the measurement devices are bulky, complex to operate, and costly; the present invention uses an electrochemical capture method to measure the CO2 concentration in the inspection well, which can effectively solve the problem that it is difficult for traditional CO2 sensors to accurately measure its average concentration due to the uneven spatial distribution and large temporal variation of the CO2 concentration in the inspection well, and provides a scientific and reliable measurement method for measuring the CO2 concentration in the gas in the drainage inspection well or other similar scenarios; the housing 1 of the measurement device of the present invention is small, light and portable, and is convenient for handheld operation. The suction hose 6 cooperates with the suction head to suck the gas in the inspection well into the device at a constant flow rate and make the air flow through the electrochemical capture unit; the electrochemical capture unit, as the core component, realizes the adsorption and desorption of CO2 through the action of the porous electrolyte 11 and the electrode 16; the present invention uses the porous electrolyte 11 as the CO2 adsorption medium, and this medium can effectively capture the CO2 molecules in the air flow; at the same time, the voltage change of the electrode 16 is monitored by the controller 12 and the potentiometer 18 to achieve precise control during the adsorption and desorption processes; during the adsorption process, the CO2 molecules are captured by the porous electrolyte 11, causing a potential change between the electrodes 16; during the desorption process, a voltage is applied to the electrode 16 to promote the release of CO2, which is discharged through the exhaust port 2; the controller 12 of the present invention monitors the potential change between the electrodes 16 through the potentiometer 18, judges the progress state of the CO2 adsorption reaction, and records the time from the start of adsorption to adsorption saturation; according to a preset calculation formula, the adsorption time is converted into the average concentration of CO2 in the inspection well, and the measurement result is displayed in real time through the display screen; the device of the present invention is designed with operation buttons 4 and a display screen 3, which is convenient for the operator to set parameters and view results; at the same time, it is powered by a rechargeable battery 14 to ensure the long-term stable operation of the device; after the measurement is completed, the desorption process is controlled by the controller to make the device return to the initial state for the next use; the present invention also has a dust-proof and waterproof design, which meets the operation requirements in complex environments, and has a built-in data storage function, supporting the query and export of historical data, providing strong support for environmental monitoring and safety management; its simple operation process and high-efficiency measurement ability will significantly improve the on-site work efficiency and data accuracy.

Claims

1. A device for measuring the CO2 concentration in a sewage inspection well based on an electrochemical capture technology, characterized in that, Comprising: A handheld measuring device housing (1) with a display screen (3), operation buttons (4), and a controller (12) installed inside or on its surface, and an exhaust gas outlet (2) and a sealing ring (5) installed outside; An air suction device, including an air suction hose (6) fixed below the sealing ring (5) and connected to the inside of the measuring device housing (1). The lower part of the air suction hose (6) is provided with an air suction head housing (7). The front end of the air suction head housing (7) is provided with an air inlet hole (8), and an air inlet fan (9) is installed inside it and fixed to the air suction head housing (7) through a fan bracket (10) for sucking the gas in the inspection well at a constant flow rate; An electrochemical capture and adsorption device, including an electrochemical capture unit housing (15) installed in the measuring device housing (1). One end of the electrochemical capture unit housing (15) is communicated with the air suction hose (6), and the other end is communicated with the exhaust gas outlet (2) through a gas guide pipe (13). A porous electrolyte (11) is installed inside the electrochemical capture unit housing (15), and electrodes (16) are arranged inside the porous electrolyte (11). The electrodes (16) are connected to a potentiometer (18) through wires (17), and the potentiometer (18) transmits the measured potential signal to the controller (12); The porous electrolyte (11) is made of a CO2 adsorption medium, so that CO2 in the air flow is adsorbed when passing through and released after a voltage is applied to the electrodes (16); The controller (12) judges the CO2 adsorption saturation degree according to the potential signal transmitted by the potentiometer (18), records the time from the start of adsorption to adsorption saturation, and calculates the average CO2 concentration in the air flow according to a built-in calculation formula.

2. The carbon dioxide concentration measuring device in a sewage inspection well based on an electrochemical capture technology according to claim 1, characterized in that: The display screen (3) and the operation buttons (4) are arranged on the front of the measuring device housing (1) for displaying the measurement results and operating the internal system of the measuring device; the exhaust gas outlet (2) is installed on the upper part of the measuring device housing (1) for discharging the exhaust gas without CO2 and releasing the captured CO2.

3. The CO2 concentration measuring device in a sewage inspection well based on an electrochemical capture technology according to claim 1, characterized in that: The air suction hose (6) and the air suction head housing (7) are made of a soft material, and the sealing ring (5) is made of a soft sealing material for sealing the gap between the air suction hose (6) and the measuring device housing (1).

4. The CO2 concentration measuring device in a sewage inspection well based on an electrochemical capture technology according to claim 1, characterized in that: The measuring device further includes a rechargeable battery (14), which is electrically connected to the display screen (3), operation buttons (4), controller (12), potentiometer (18), air inlet fan (9), and the electrochemical capture and adsorption device for power supply, and supplies power to the electrodes (16) during the CO2 release process.

5. A method for measuring the CO2 concentration in a sewage inspection well based on an electrochemical capture technology, characterized in that, It is a CO2 concentration measuring device in a sewage inspection well based on the electrochemical capture technology described in any one of the above claims 1 to 4. The method includes the following steps: Step1: Charging, charging the rechargeable battery (14); Step2: Placing the device, holding the measuring device beside the inspection well, and putting the gas guide pipe (13) and the air suction head into the position to be measured in the inspection well; Step 3: Start the measurement, activate the intake fan (9), and check that the gas in the well enters the electrochemical capture device at a constant flow rate and record the start time ; Step4: Adsorption process, CO2 in the air flow is adsorbed by the porous electrolyte (11), causing a potential change between the electrodes (16). The potential between the electrodes is measured by the potentiometer (18), and the adsorption process is monitored by the controller (12); Step 5: End the measurement. When the controller (12) monitors the end of the adsorption process, record the time , and turn off the intake fan (9). Calculate and display the average CO2 concentration through the built-in calculation formula as follows; （1）； Wherein, is the saturated adsorption capacity of the electrolyte; is the preset air flow rate of the device; is the end time of the adsorption process; is the start time when the device starts to work; is the average CO2 concentration in the air; Step 6: Release CO2. After the measurement is completed, the controller (12) controls the rechargeable battery (14) to apply a voltage to the electrode (16) to release the CO2 adsorbed in the porous electrolyte (11), returning the device to its initial state.

6. The method for measuring the CO2 concentration in a sewage inspection well based on an electrochemical capture technology according to claim 5, wherein: The measurement method is to calculate the average concentration of CO2 in the inspection well by measuring the time it takes for the electrochemical capture device to adsorb CO2 to saturation and combining it with the intake air volume of the intake fan.

Images