A method for detecting carbon dioxide gas

Abstract

The application discloses a carbon dioxide gas detection method, and relates to the technical field of environmental protection, which comprises the following steps: obtaining the standard concentration of carbon dioxide gas, changing the environmental temperature and recording the measured concentration of carbon dioxide gas under different temperatures; calculating the temperature compensation coefficient of each temperature point based on the measured concentration of carbon dioxide gas under different temperatures; based on the temperature compensation coefficient, correcting the carbon dioxide concentration value in real time by a sensor in an actual environment; separating carbon dioxide gas from an environment containing multiple-component gas by using a separation technology; comparing the concentration value of the separated carbon dioxide gas with the standard concentration value, and correcting the concentration value according to the temperature compensation coefficient to obtain the final carbon dioxide concentration measurement value. By separating high-purity carbon dioxide from a multiple-component gas environment by using the separation technology and correcting the concentration of the carbon dioxide, the accuracy of the final measurement result is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of environmental protection, and particularly relates to a carbon dioxide gas detection method. BACKGROUND

[0002] With the increasingly serious global climate change problem, the monitoring of carbon dioxide (CO2) concentration has become increasingly important in the fields of environmental protection, industrial production, and public health. Traditional carbon dioxide detection techniques mainly rely on infrared spectroscopy, electrochemical sensors, and gas chromatography methods. These methods have made significant progress in terms of precision, response speed, and stability. However, with the complexity of application scenarios, especially in environments with drastic temperature changes, the accuracy and reliability of existing detection techniques face many challenges.

[0003] Specifically, temperature changes have a significant impact on the performance of sensors, leading to uncertainty and deviation in measurement results. Although existing technologies have reduced the impact of temperature on measurement through temperature compensation mechanisms, most methods still rely on simple linear compensation, which cannot fully eliminate the interference of nonlinear temperature effects on sensors. In addition, current technologies still have certain limitations in separating and accurately detecting carbon dioxide concentration in multi-component gas environments, making it difficult to meet the demand for accurate detection of carbon dioxide in complex environments. SUMMARY

[0004] In view of the above existing problems, the present application is proposed.

[0005] Therefore, the present application provides a carbon dioxide gas detection method to solve the problem of insufficient detection accuracy in existing technologies in temperature changes and multi-component gas environments.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] In a first aspect, the present application provides a carbon dioxide gas detection method, which includes,

[0008] obtaining the standard concentration of carbon dioxide gas, changing the environmental temperature and recording the measured concentration of carbon dioxide gas at different temperatures;

[0009] based on the measured concentration of carbon dioxide gas at different temperatures, calculating the temperature compensation coefficient at each temperature point;

[0010] based on the temperature compensation coefficient, the sensor in the actual environment real-time monitors and corrects the carbon dioxide concentration value;

[0011] using the improved carbon dioxide sensor to detect the corrected carbon dioxide concentration value, enhancing the sensitivity of the sensor to carbon dioxide;

[0012] Separating carbon dioxide gas from an environment containing multiple components of gas using separation technology;

[0013] Comparing the concentration of the separated carbon dioxide gas with a standard concentration value, and correcting it according to a temperature compensation coefficient to obtain a final carbon dioxide concentration measurement value.

[0014] As a preferred embodiment of the carbon dioxide gas detection method of the present application, wherein: obtaining the standard concentration of carbon dioxide gas comprises the following steps,

[0015] Setting an environment cabin in a laboratory that is completely closed and has no gas flow;

[0016] Setting the temperature in the environment cabin to a standard temperature through an air conditioning system, and placing a temperature and humidity sensor in the center of the environment cabin to monitor the temperature in the cabin;

[0017] Installing a fixed carbon dioxide gas inlet device in the environment cabin;

[0018] Connecting the device to a carbon dioxide gas source with a known concentration, and equipping it with a flow meter and a valve;

[0019] Selecting a high-precision carbon dioxide concentration sensor and installing it in a suitable position in the environment cabin;

[0020] Connecting the sensor to a data logger for real-time data recording;

[0021] Opening the valve of the carbon dioxide gas inlet device, setting the inlet time, and introducing carbon dioxide gas into the environment cabin;

[0022] Real-time monitoring of the change in carbon dioxide concentration in the cabin during the inlet process;

[0023] After the carbon dioxide gas inlet is completed, the valve of the inlet device is closed, and the carbon dioxide concentration value detected by the sensor in the environment cabin at this temperature is recorded as the standard concentration of carbon dioxide gas.

[0024] As a preferred embodiment of the carbon dioxide gas detection method of the present application, wherein: changing the environment temperature and recording the measured concentration of carbon dioxide gas at different temperatures comprises the following steps,

[0025] According to the experimental design, a series of temperature detection points are set;

[0026] Using the air conditioning system in the laboratory, the temperature in the environment cabin is gradually adjusted to the first set temperature point, and the temperature change is monitored in real time through the temperature and humidity sensor;

[0027] Adjust the temperature in the environmental cabin to the next set temperature point in sequence, and record the carbon dioxide concentration value at the temperature again until the detection of all set temperature points is completed, and the measured carbon dioxide concentration values at different temperatures are recorded.

[0028] As a preferred scheme of the carbon dioxide gas detection method, wherein: based on the measured concentration of carbon dioxide gas at different temperatures, the temperature compensation coefficient of each temperature point is calculated, and the expression is:

[0029]

[0030] Wherein, β(T) is the compensation coefficient at temperature T, C std is the carbon dioxide concentration value at the standard temperature, V0 is the flow rate of the carbon dioxide gas into the device, C S is the concentration of carbon dioxide in the gas source, V is the volume of the environmental cabin, t is the time of input, C B is the original carbon dioxide concentration in the environmental cabin, k is the temperature coefficient, α is the quadratic temperature correction coefficient, T0 is the standard temperature, and T is the current temperature.

[0031] The calculated compensation coefficients are arranged to generate a compensation coefficient table.

[0032] As a preferred scheme of the carbon dioxide gas detection method, wherein: based on the temperature compensation coefficient, the sensor real-time monitors and corrects the carbon dioxide concentration value in the actual environment, including the following steps,

[0033] Obtain the real-time temperature in the current environmental cabin through the temperature sensor;

[0034] According to the current temperature, find the corresponding compensation coefficient from the generated compensation coefficient table;

[0035] If the current temperature matches a certain temperature point in the table, directly read the compensation coefficient of the point;

[0036] If the current temperature is not at the temperature point listed in the table, use the linear interpolation method to select the nearest two temperature points to calculate the corresponding compensation coefficient, and the expression is:

[0037]

[0038] Wherein, T c is the current temperature, β i (T c ) is the compensation coefficient at the current temperature calculated by interpolation, T1 is the lower temperature point close to the current temperature in the compensation coefficient table, T2 is the higher temperature point close to the current temperature in the compensation coefficient table, β(T1) is the compensation coefficient at the lower temperature point T1, and β(T2) is the compensation coefficient at the higher temperature point T2.

[0039] correcting the current measured carbon dioxide concentration value using the corresponding compensation coefficient;

[0040] recording the corrected carbon dioxide concentration value into the data logger.

[0041] As a preferred embodiment of the carbon dioxide gas detection method, the improved carbon dioxide sensor is used to detect the corrected carbon dioxide concentration value, and the enhanced sensitivity of the sensor to carbon dioxide includes the following steps,

[0042] A nanomaterial with high sensitivity and high selectivity is selected as the coating material of the sensor sensitive element;

[0043] The selected nanomaterial is uniformly coated on the surface of the sensor sensitive element by solution deposition method to form a uniform and dense film;

[0044] In the absence of carbon dioxide, the baseline response of the improved sensor is recorded;

[0045] The carbon dioxide concentration in the environment is gradually increased, and the response value of the improved sensor under different concentrations of carbon dioxide is recorded and corrected;

[0046] The carbon dioxide concentration value detected and corrected by the improved sensor is compared with the corrected carbon dioxide concentration value in the data logger and the standard carbon dioxide concentration value, respectively, to observe the sensitivity of the improved sensor to carbon dioxide.

[0047] As a preferred embodiment of the carbon dioxide gas detection method, the separation technology is used to separate carbon dioxide gas from the environment containing multiple components, including the following steps,

[0048] An adsorbent with high selectivity and high adsorption capacity is selected;

[0049] The mixed gas containing carbon dioxide is introduced into the adsorption tower at a constant flow rate;

[0050] Carbon dioxide molecules undergo physical adsorption reaction on the surface of the adsorbent, and other gas components are discharged through the adsorption tower;

[0051] When the adsorbent reaches the saturation state, the carbon dioxide is desorbed from the surface of the adsorbent by reducing the pressure in the adsorption tower, and the desorbed carbon dioxide gas is collected;

[0052] The desorbed carbon dioxide gas is purified by condensation and washing to obtain high-purity carbon dioxide;

[0053] The improved sensor is used to determine the concentration of the purified carbon dioxide.

[0054] As a preferred solution of the carbon dioxide gas detection method, wherein: the separated carbon dioxide gas concentration value is compared with the standard concentration value, and the final carbon dioxide concentration measurement value is obtained by correcting according to the temperature compensation coefficient, including the following steps,

[0055] Calculate the deviation between the separated pure carbon dioxide concentration value and the standard concentration value;

[0056] If the deviation is small, it means that the measurement result is highly consistent with the standard concentration value, and the next step of verification and output is entered;

[0057] If the deviation is significantly deviated, further correction is needed;

[0058] According to the calculated compensation coefficient of each temperature point, the concentration of the purified carbon dioxide is corrected again as the final measurement result output.

[0059] In the second aspect, the embodiment of the present application provides a computer device, including a memory and a processor, the memory stores a computer program, wherein: the computer program is executed by the processor to realize any step of the carbon dioxide gas detection method according to the first aspect of the present application.

[0060] In the third aspect, the embodiment of the present application provides a computer readable storage medium, which stores a computer program, wherein: the computer program is executed by the processor to realize any step of the carbon dioxide gas detection method according to the first aspect of the present application.

[0061] The present application has the following advantages: by obtaining the standard concentration of carbon dioxide gas under standard temperature conditions, an accurate reference value is provided for subsequent temperature compensation and correction; by changing the environmental temperature and recording the carbon dioxide concentration at different temperatures, the overall record of the influence of temperature change on measurement is realized, and data support is provided for calculating the temperature compensation coefficient; the calculated temperature compensation coefficient is modeled by mathematical model, which ensures the measurement accuracy of the sensor under different temperature conditions; the carbon dioxide concentration value is corrected in real time based on the temperature compensation coefficient in the actual environment, which significantly improves the measurement stability of the sensor; by using high sensitivity nanomaterial to improve the sensor, the sensitivity of the sensor to carbon dioxide is enhanced; by using separation technology to separate high-purity carbon dioxide from multi-component gas environment and correcting its concentration, the accuracy of the final measurement result is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0063] Figure 1 Flow chart of the carbon dioxide gas detection method in Example 1.

[0064] Figure 2 Carbon dioxide concentration change graph in the optimized adsorption process in Example 1. DETAILED DESCRIPTION

[0065] In order to make the above-mentioned objects, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0066] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0067] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or selected from other embodiments.

[0068] Example 1, refer to Figure 1 and Figure 2 , the first embodiment of the present application provides a carbon dioxide gas detection method, comprising the following steps:

[0069] S1, obtaining the standard concentration of carbon dioxide gas comprises the following steps,

[0070] An environment cabin completely closed and without gas flow is set up in the laboratory; the temperature in the environment cabin is set to the standard temperature (25℃) by the air conditioning system, and the temperature and humidity sensor is placed in the center position of the environment cabin to monitor the temperature in the cabin, and ensure that the temperature is stable within the range of 25℃±0.5℃; a fixed carbon dioxide gas inlet device is installed in the environment cabin; the device is connected to the carbon dioxide gas source with known concentration, and is equipped with a flow meter and a valve to accurately control the flow rate of the carbon dioxide gas into the environment cabin; the flow rate is set to V0 cubic meters per minute (m 3The carbon dioxide gas concentration in the environment cabin is uniform distributed in a certain time by setting the flow rate of the carbon dioxide gas inlet device to 0.5 L / min; a high-precision carbon dioxide concentration sensor is installed at a suitable position in the environment cabin to ensure that the sensor can accurately detect the carbon dioxide concentration in each corner of the environment cabin; the sensor is connected with a data logger for real-time data recording; the valve of the carbon dioxide gas inlet device is opened, and the inlet time is set to t seconds, and the carbon dioxide gas is introduced into the environment cabin; the change of the carbon dioxide concentration in the cabin during the inlet process is monitored in real time; after the introduction of the carbon dioxide gas is completed, the valve of the inlet device is closed, and the carbon dioxide concentration value detected by the sensor in the environment cabin at this temperature is recorded as the standard concentration of the carbon dioxide gas.

[0071] Further, the expression of the standard concentration value is:

[0072]

[0073] wherein Cstd is the standard concentration of the carbon dioxide gas in the environment cabin, V0 is the flow rate of the carbon dioxide gas inlet device (m 3 / min), C S is the concentration of carbon dioxide in the gas source (ppm), V is the volume of the environment cabin (m 3 ), t is the inlet time (s), and C B is the original carbon dioxide concentration in the environment cabin (ppm).

[0074] S2, changing the environment temperature and recording the measured carbon dioxide concentration at different temperatures, comprising the following steps,

[0075] According to the experimental design, a series of temperature detection points are set, for example, one detection point is set every 10°C, from 10°C to 60°C, and the set temperature at each temperature point is stable within a small error range, for example, ±0.5°C; the temperature in the environment cabin is gradually adjusted to the first set temperature point (for example, 10°C) using the air conditioning system in the laboratory, and the temperature change is monitored in real time through the temperature and humidity sensor; the temperature in the environment cabin is adjusted to the next set temperature point (for example, 20°C) in turn, and the carbon dioxide concentration value at this temperature is recorded again, until the detection of all set temperature points is completed, and the measured carbon dioxide concentration values at different temperatures are recorded.

[0076] Further, the concentration change correction term caused by temperature is defined, and the expression is:

[0077] f(T)=k·(T-T0)+α·(T-T0) 2 ;

[0078] wherein f(T) is the concentration change correction term caused by temperature T, k is the temperature coefficient, a is the quadratic temperature correction coefficient, and T0 is the standard temperature (25°C).

[0079] The carbon dioxide concentration values measured at different temperatures are calculated according to the concentration change correction term, expressed as:

[0080]

[0081] wherein C CO2 (T) is the carbon dioxide concentration value at different temperatures.

[0082] S3, based on the carbon dioxide gas measurement concentration at different temperatures, the temperature compensation coefficient at each temperature point is calculated, expressed as:

[0083]

[0084] wherein β(T) is the compensation coefficient at temperature T, used to correct the actual measured carbon dioxide concentration value to match the concentration value under standard conditions, C std is the carbon dioxide concentration value at standard temperature (25℃), V0 is the flow rate of carbon dioxide gas into the device, which refers to the speed of carbon dioxide gas into the environmental cabin, determining the volume of gas entering the cabin within a given time, C S is the concentration of carbon dioxide in the gas source, V is the volume of the environmental cabin, indicating the size of the space where the gas can be distributed, t is the time of input, which combined with the flow rate determines the total amount of carbon dioxide entering the cabin, C B is the original carbon dioxide concentration in the environmental cabin, k is the temperature coefficient, used to describe the linear effect of temperature change on carbon dioxide concentration, α is the quadratic temperature correction coefficient, used to describe the quadratic (nonlinear) effect of temperature change on carbon dioxide concentration, T0 is the standard temperature (25℃), the carbon dioxide concentration at this temperature is defined as the standard concentration, T is the current temperature, which refers to the temperature in the current environmental cabin, the deviation from the standard temperature will affect the measured carbon dioxide concentration;

[0085] The calculated compensation coefficients are arranged to generate a compensation coefficient table.

[0086] S4, based on the temperature compensation coefficient, the sensor real-time monitors and corrects the carbon dioxide concentration value in the actual environment, including the following steps,

[0087] The real-time temperature in the current environmental cabin is obtained by the temperature sensor; according to the current temperature, the corresponding compensation coefficient is found in the generated compensation coefficient table; if the current temperature matches a certain temperature point in the table, the compensation coefficient at that point is directly read; if the current temperature is not at the temperature point listed in the table, the linear interpolation method is used to select the nearest two temperature points to calculate the corresponding compensation coefficient, expressed as:

[0088]

[0089] wherein, T c is the current temperature, β i (T c ) is the compensation factor at the current temperature calculated by interpolation, T1 is a lower temperature point close to the current temperature in the compensation factor table, T2 is a higher temperature point close to the current temperature in the compensation factor table, β(T1) is the compensation factor at the lower temperature point T1, and β(T2) is the compensation factor at the higher temperature point T2.

[0090] The compensation factor is used to correct the current measured carbon dioxide concentration value; and the corrected carbon dioxide concentration value is recorded in the data logger.

[0091] S5, using the improved carbon dioxide sensor to detect the corrected carbon dioxide concentration value, and enhancing the sensitivity of the sensor to carbon dioxide includes the following steps,

[0092] A nanomaterial with high sensitivity and high selectivity is selected as the coating material of the sensitive element of the sensor;

[0093] The selected nanomaterial is uniformly coated on the surface of the sensitive element of the sensor by a solution deposition method to form a uniform and dense film;

[0094] In the absence of carbon dioxide, the baseline response of the improved sensor is recorded;

[0095] The carbon dioxide concentration in the environment is gradually increased, and the response value of the improved sensor under different concentrations of carbon dioxide is recorded and corrected;

[0096] The carbon dioxide concentration value detected and corrected by the improved sensor and the corrected carbon dioxide concentration value in the data logger are compared with the standard carbon dioxide concentration value, respectively, to observe the sensitivity of the improved sensor to carbon dioxide.

[0097] S6, using separation technology to separate carbon dioxide gas from an environment containing multiple components includes the following steps,

[0098] An adsorbent with high selectivity and high adsorption capacity is selected, such as modified zeolite, activated carbon, or metal organic framework (MOFs);

[0099] The mixed gas containing carbon dioxide is introduced into the adsorption tower at a constant flow rate;

[0100] Carbon dioxide molecules undergo physical adsorption reaction on the surface of the adsorbent, and other gas components are discharged through the adsorption tower;

[0101] When the adsorbent reaches a saturated state, carbon dioxide is desorbed from the surface of the adsorbent by reducing the pressure in the adsorption tower, and the desorbed carbon dioxide gas is collected;

[0102] The desorbed carbon dioxide gas is purified by condensation and washing to obtain high-purity carbon dioxide;

[0103] The concentration of the purified carbon dioxide is measured using the improved sensor.

[0104] Further, the expression for optimizing the concentration change of carbon dioxide during adsorption is:

[0105]

[0106] where C out (t) is the concentration of carbon dioxide in the gas downstream of the adsorption tower at time t, C in is the initial concentration of carbon dioxide in the mixed gas, q ads (t) is the adsorption capacity of carbon dioxide of the adsorbent at time t, A bed is the effective area of the adsorbent bed, η ads is the adsorption efficiency of the adsorbent, V gas (t) is the volume of gas flowing through the adsorption tower at time t, and ρ CO2 is the density of carbon dioxide.

[0107] C out (t) has a value range of 0≤C out (t)≤C in , where C out (t) is closer to 0, the more effective the adsorption process is, and the more complete the adsorption of carbon dioxide is.

[0108] q ads (t) has a value range of 0≤q ads (t)≤q max , where q max is the maximum adsorption capacity of the adsorbent. Higher q ads (t) indicates that the adsorbent has higher adsorption capacity.

[0109] S7, comparing the separated carbon dioxide gas concentration value with the standard concentration value and correcting it according to the temperature compensation coefficient to obtain the final carbon dioxide concentration measurement value, comprising the following steps,

[0110] calculating the deviation between the separated pure carbon dioxide concentration value and the standard concentration value;

[0111] If the deviation is close to 0, it indicates that the measurement result is highly consistent with the standard concentration value, and the next step of verification and output is entered;

[0112] If the deviation deviates significantly from 0, further correction is needed;

[0113] According to the calculated compensation coefficient of each temperature point, the concentration of the purified carbon dioxide is re-corrected as a final measurement result.

[0114] The embodiment also provides a computer device suitable for the carbon dioxide gas detection method, including a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions to realize the carbon dioxide gas detection method proposed in the above embodiment.

[0115] The computer device can be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner. The wireless manner can be achieved through WIFI, an operator network, NFC (Near Field Communication) or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the shell of the computer device, or an external keyboard, touchpad or mouse, etc.

[0116] The embodiment also provides a storage medium having a computer program stored thereon, the program being executed by a processor to realize the carbon dioxide gas detection method proposed in the above embodiment. The storage medium can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic storage, a flash memory, a magnetic disk or an optical disk.

[0117] In summary, the present application obtains the standard concentration of carbon dioxide gas under standard temperature conditions, providing an accurate reference value for subsequent temperature compensation and correction; by changing the environmental temperature and recording the carbon dioxide concentration at different temperatures, the overall recording of the influence of temperature change on measurement is realized, providing data support for calculating the temperature compensation coefficient; the calculated temperature compensation coefficient is mathematically modeled, ensuring the measurement accuracy of the sensor under different temperature conditions; the carbon dioxide concentration value is corrected in real time based on the temperature compensation coefficient in the actual environment, significantly improving the measurement stability of the sensor; by using high-sensitivity nanomaterials to improve the sensor, the sensitivity of the sensor to carbon dioxide is enhanced; by using separation technology to separate high-purity carbon dioxide from the multi-component gas environment, and correcting the concentration, the accuracy of the final measurement result is ensured.

[0118] Example 2

[0119] Referring to Table 1, the second embodiment of the present application is given, and experimental simulation data of the carbon dioxide gas detection method is given to further verify the technical solution of the present application.

[0120] First, a completely closed and gas-free environment cabin is set up in the laboratory, the temperature in the environment cabin is set to standard temperature 25℃ by the air conditioning system, and the temperature and humidity sensor is placed in the center of the environment cabin to monitor the temperature in the cabin, ensuring that the temperature is stable within 25℃±0.5℃. Subsequently, a fixed carbon dioxide gas inlet device is installed in the environment cabin, and a carbon dioxide gas source with known concentration is connected, equipped with a flow meter and a valve to accurately control the flow rate of carbon dioxide gas into the environment cabin. The flow rate is set to 0.1 cubic meters per minute (m 3 / min), ensuring uniform distribution of carbon dioxide gas concentration in the environment cabin within a certain time. A high-precision carbon dioxide concentration sensor is selected and installed at a suitable position in the environment cabin to ensure that the sensor can accurately detect the carbon dioxide concentration in each corner of the environment cabin. The sensor is connected to a data logger for real-time data recording.

[0121] During the experiment, first open the valve of the carbon dioxide gas inlet device, set the inlet time to 300 seconds (s), and introduce carbon dioxide gas into the environment cabin, and monitor the change of carbon dioxide concentration in the cabin in real time during the inlet process. After the carbon dioxide gas inlet is completed, the valve of the inlet device is closed, and the carbon dioxide concentration value detected by the sensor in the environment cabin at this temperature is recorded as the standard concentration of carbon dioxide gas.

[0122] After obtaining the standard concentration, a series of temperature detection points are set according to the experimental design, from 10℃ to 60℃, and the set temperature at each temperature point is stable within a small error range (±0.5℃). Using the air conditioning system in the laboratory, the temperature in the environmental chamber is gradually adjusted to the first set temperature point (for example, 10℃), and the temperature change is monitored in real time through the temperature and humidity sensor. The temperature in the environmental chamber is adjusted to the next set temperature point (for example, 20℃) in turn, and the carbon dioxide concentration value at this temperature is recorded again until all the set temperature points are detected, and the measured carbon dioxide concentration values at different temperatures are recorded.

[0123] The calculated compensation coefficients are arranged to generate a compensation coefficient table.

[0124] Based on the temperature compensation coefficient, the sensor real-time monitors and corrects the carbon dioxide concentration value in the actual environment. The real-time temperature in the current environmental chamber is obtained through the temperature sensor; according to the current temperature, the corresponding compensation coefficient is found from the generated compensation coefficient table; if the current temperature matches a certain temperature point in the table, the compensation coefficient of that point is directly read; if the current temperature is not on the temperature points listed in the table, the nearest two temperature points are selected to calculate the corresponding compensation coefficient using linear interpolation method. The measured carbon dioxide concentration value is corrected using the compensation coefficient; the corrected carbon dioxide concentration value is recorded in the data recorder.

[0125] The improved carbon dioxide sensor is used to detect the corrected carbon dioxide concentration value. A nanomaterial with high sensitivity and high selectivity is selected as the coating material of the sensor sensitive element; the selected nanomaterial is uniformly coated on the surface of the sensor sensitive element by solution deposition method to form a uniform and dense film; the baseline response of the improved sensor is recorded in a carbon dioxide-free environment; the carbon dioxide concentration in the environment is gradually increased, and the response value of the improved sensor under different carbon dioxide concentrations is recorded and corrected; the carbon dioxide concentration values detected and corrected by the improved sensor and the corrected carbon dioxide concentration values in the data recorder are compared with the standard carbon dioxide concentration values respectively, and the sensitivity of the improved sensor to carbon dioxide is observed.

[0126] Separation technology is used to separate carbon dioxide gas from an environment containing multiple components. An adsorbent with high selectivity and high adsorption capacity is selected, such as modified zeolite; the mixed gas containing carbon dioxide is introduced into the adsorption tower at a constant flow rate; carbon dioxide molecules undergo physical adsorption reaction with the surface of the adsorbent, and other gas components are discharged through the adsorption tower; when the adsorbent reaches saturation state, carbon dioxide is desorbed from the surface of the adsorbent by reducing the pressure in the adsorption tower, and the desorbed carbon dioxide gas is collected; the improved sensor is used to measure the concentration of purified carbon dioxide.

[0127] Finally, the separated carbon dioxide gas concentration value is compared with the standard concentration value, and is corrected according to the temperature compensation coefficient to obtain the final carbon dioxide concentration measurement value. The deviation between the separated pure carbon dioxide concentration value and the standard concentration value is calculated; if the deviation is close to 0, it indicates that the measurement result is highly consistent with the standard value, and the next step of verification and output is entered; if the deviation significantly deviates from 0, further correction is needed; according to the calculated compensation coefficient of each temperature point, the concentration of the measured purified carbon dioxide is corrected again as the final measurement result output.

[0128] Specifically as shown in Table 1:

[0129] Table 1 Experimental record table

[0130]

[0131] Through analysis of the table data, the application provides a carbon dioxide concentration measurement and separation technology based on temperature compensation, which corrects the carbon dioxide concentration measurement value at different temperatures through a temperature compensation coefficient, uses an improved sensor to enhance the detection ability of low-concentration carbon dioxide, and obtains high-purity carbon dioxide gas through an efficient separation technology. These innovative technical solutions have obvious advantages in improving measurement accuracy and separation efficiency compared with the prior art.

[0132] It should be noted that the above embodiments are only used to illustrate the technical solutions of the application and not to limit it, although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the application, which should be covered in the scope of the claims of the application.

Claims

1. A method of detecting carbon dioxide gas, characterized by: Comprising, Obtaining the standard concentration of carbon dioxide gas, changing the environmental temperature and recording the measured concentration of carbon dioxide gas at different temperatures; Based on the measured concentration of carbon dioxide gas at different temperatures, calculating the temperature compensation coefficient at each temperature point; Based on the temperature compensation coefficient, the sensor real-time monitors and corrects the carbon dioxide concentration value in the actual environment; Using the improved carbon dioxide sensor to detect the concentration value of carbon dioxide in the gas, and correcting the measured concentration value, enhancing the sensitivity of the sensor to carbon dioxide; Using separation technology to separate carbon dioxide gas from the environment with multiple component gases; Comparing the concentration value of the separated carbon dioxide gas with the standard concentration value, and correcting according to the temperature compensation coefficient to obtain the final carbon dioxide concentration measurement value; Based on the measured concentration of carbon dioxide gas at different temperatures, calculating the temperature compensation coefficient at each temperature point, the expression is: ； Wherein, is the compensation coefficient at temperature , is the carbon dioxide concentration value at standard temperature, is the flow rate (m 3 / min) of the carbon dioxide gas inlet device, is the concentration of carbon dioxide in the gas source, is the volume (m 3 ) of the environmental cabin, is the inlet time (s), is the original carbon dioxide concentration of the environmental cabin, is the temperature coefficient, is the secondary temperature correction coefficient, is the standard temperature, is the current temperature; Organize the calculated compensation coefficient to generate a compensation coefficient table.

2. The carbon dioxide gas detection method according to claim 1, characterized by: Obtaining the standard concentration of carbon dioxide gas includes the following steps, Set up a completely closed and no gas flow environment cabin in the laboratory; Set the temperature in the environment cabin to the standard temperature through the air conditioning system, and place the temperature and humidity sensor in the center of the environment cabin to monitor the temperature in the cabin; Install a fixed carbon dioxide gas inlet device in the environment cabin; The device is connected to a carbon dioxide gas source with known concentration, and is equipped with a flow meter and a valve; Select a high-precision carbon dioxide concentration sensor and install it in a suitable position in the environment cabin; Connect the sensor with the data logger for real-time data recording; Open the valve of the carbon dioxide gas inlet device, set the inlet time, and inlet carbon dioxide gas into the environment cabin; Real-time monitor the change of carbon dioxide concentration in the cabin during the inlet process; After the carbon dioxide gas inlet is completed, close the valve of the inlet device, and record the carbon dioxide concentration value detected by the sensor in the environment cabin at this temperature as the standard concentration of carbon dioxide gas.

3. The carbon dioxide gas detection method according to claim 1, characterized by: Changing the environmental temperature and recording the measured concentration of carbon dioxide gas at different temperatures includes the following steps, According to the experimental design, set a series of temperature detection points; Use the air conditioning system in the laboratory to gradually adjust the temperature in the environment cabin to the first set temperature point, and monitor the temperature change in real time through the temperature and humidity sensor; Adjust the temperature in the environment cabin to the next set temperature point in turn, and record the carbon dioxide concentration value at this temperature again, until all the set temperature points are detected, and the measured carbon dioxide concentration values at different temperatures are recorded.

4. The carbon dioxide gas detection method according to claim 3, characterized by: Based on the temperature compensation coefficient, the sensor real-time monitors and corrects the carbon dioxide concentration value in the actual environment includes the following steps, Obtain the real-time temperature in the current environment cabin through the temperature sensor; According to the current temperature, find the corresponding compensation coefficient from the generated compensation coefficient table; If the current temperature matches a certain temperature point in the table, directly read the compensation coefficient of that point; If the current temperature is not on the temperature points listed in the table, use the linear interpolation method to select the nearest two temperature points to calculate the corresponding compensation coefficient, the expression is: ； in, The current temperature. The compensation coefficient is calculated using interpolation at the current temperature. For the lower temperature points in the compensation coefficient table that are close to the current temperature, For the higher temperature points in the compensation coefficient table that are close to the current temperature, Lower temperature point The compensation coefficient below, Higher temperature point The compensation coefficient below; Use the corresponding compensation coefficient to correct the current measured carbon dioxide concentration value; The corrected carbon dioxide concentration value is recorded in the data logger.

5. The carbon dioxide gas detection method according to claim 4, characterized by: The corrected carbon dioxide concentration value is detected using the improved carbon dioxide sensor, and the sensitivity of the sensor to carbon dioxide is enhanced by including the following steps, A nanomaterial with high sensitivity and high selectivity is selected as the coating material of the sensor sensitive element; The selected nanomaterial is uniformly coated on the surface of the sensor sensitive element by solution deposition method to form a uniform and dense film; The baseline response of the improved sensor is recorded in a carbon dioxide-free environment; The concentration of carbon dioxide in the environment is gradually increased, and the response value of the improved sensor under different concentrations of carbon dioxide is recorded and corrected; The carbon dioxide concentration value detected and corrected by the improved sensor is compared with the corrected carbon dioxide concentration value in the data logger and the standard carbon dioxide concentration value, respectively, to observe the sensitivity of the improved sensor to carbon dioxide.

6. The carbon dioxide gas detection method according to claim 5, characterized by: The separation technology is used to separate carbon dioxide gas from an environment containing multiple component gases, including the following steps, An adsorbent with high selectivity and high adsorption capacity is selected; The mixed gas containing carbon dioxide is introduced into the adsorption tower at a constant flow rate; Carbon dioxide molecules undergo physical adsorption reaction on the surface of the adsorbent, and other gas components are discharged through the adsorption tower; When the adsorbent reaches saturation, carbon dioxide is desorbed from the surface of the adsorbent by reducing the pressure in the adsorption tower, and the desorbed carbon dioxide gas is collected; The desorbed carbon dioxide gas is purified by condensation and washing to obtain high-purity carbon dioxide; The concentration of purified carbon dioxide is measured using the improved sensor.

7. The carbon dioxide gas detection method according to claim 6, characterized by: The separated carbon dioxide gas concentration value is compared with the standard concentration value, and corrected according to the temperature compensation coefficient to obtain the final carbon dioxide concentration measurement value, including the following steps, Calculate the deviation between the concentration value of the separated pure carbon dioxide and the standard concentration value; If the deviation is small, it means that the measurement result is highly consistent with the standard concentration value, and the next verification and output are entered; If the deviation is significantly deviated, further correction is needed; According to the calculated compensation coefficient of each temperature point, the concentration of purified carbon dioxide is corrected again as the final measurement result output.

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that: The processor executes the computer program to realize the steps of the carbon dioxide gas detection method of any one of claims 1-6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that: The computer program is executed by the processor to realize the steps of the carbon dioxide gas detection method of any one of claims 1-6.

Images