Greenhouse gas GWP testing device and testing method

Abstract

The application discloses a greenhouse gas GWP testing device and testing method, and belongs to the technical field of gas testing. The testing device comprises a reaction cavity and pipelines connected with both ends of the reaction cavity. A gas chromatograph and a Fourier infrared spectrometer are connected in parallel on a circulating gas loop. A first gas storage cylinder for storing a to-be-tested gas and a second gas storage cylinder for storing a background gas are connected on the circulating gas loop. The application can be used for testing various different gases by simulating atmospheric conditions and being convenient to operate, so that the decomposition and destruction rates of different gas molecules in the atmospheric environment and products can be analyzed. The GWP value of the corresponding gas is determined by combining infrared spectrum and gas chromatogram analysis of the corresponding gas compound, thereby laying a foundation for further research on greenhouse gases.

Description

Technical Field

[0001] This invention belongs to the field of gas testing technology, specifically relating to a greenhouse gas (GWP) testing device and testing method. Background Technology

[0002] Global Warming Potential (GWP) is an index of a substance's greenhouse effect, representing the multiple by which the greenhouse effect of various greenhouse gases corresponds to the same effect of carbon dioxide over a 100-year timeframe. While many methods exist for measuring the strength of greenhouse gas impacts, GWP is undoubtedly the most valuable, especially as a basis for policy measures. GWP evaluates greenhouse gases from a molecular perspective, including their ability to absorb and retain heat, and how long they can exist in the natural environment without being destroyed or decomposed (atmospheric lifetime). This allows for an assessment of the proportion of each greenhouse gas's impact on the greenhouse effect. GWP also assesses the destructive potential of greenhouse gases over a certain period in the future, typically measured in 20-year, 100-year, or 500-year timeframes. Generally, due to natural decomposition mechanisms, the concentration of existing greenhouse gases in the atmosphere decreases year by year, and the greenhouse effect weakens accordingly. However, some CFC family gases have considerably long atmospheric lifetimes, and their 100-year GWP may be higher than their 20-year GWP. Global warming potential refers to the combined effects of these gases in the atmosphere over different time periods and their relative role in absorbing outward-emitting infrared radiation. The Kyoto Protocol to the United Nations Framework Convention on Climate Change is based on the global warming potential of fluctuating emissions over a time span of more than 100 years.

[0003] Before large-scale application of novel greenhouse gases, accurate assessment of their impact on the atmospheric environment is essential. International research on the climate effects of greenhouse gases began in the 1970s. The Intergovernmental Panel on Climate Change (IPCC) (1995) uses global warming potential (GWP) to quantitatively assess the global warming impact of greenhouse gases. GWP data submitted by domestic and international organizations are submitted to the IPCC for review and selection, and the accuracy of this data directly affects the IPCC's technical decisions. However, for some greenhouse gases, relevant data is unavailable, requiring testing to obtain data. Therefore, a device and method for testing the GWP of gases are needed. Summary of the Invention

[0004] This invention provides a greenhouse gas (GWP) testing device and method that can be applied to the determination of the global warming potential of different gases.

[0005] To achieve the above objectives, the present invention provides a greenhouse gas (GWP) testing device, comprising a reaction chamber and a circulating gas circuit. The circulating gas circuit includes gas pipelines connected to both ends of the reaction chamber, and an ultraviolet lamp is installed outside the reaction chamber. A gas chromatograph-mass spectrometer, a Fourier transform infrared spectrometer, a reference gas pipeline, a first gas storage cylinder for storing the gas to be tested, and a second gas storage cylinder for storing background gas are connected to the gas pipelines. A selective permeable gas chamber is provided in the side wall of the reaction chamber, and an ozone generating device is installed in the selective permeable gas chamber. The selective permeable gas chamber and an oxygen cylinder are connected by a pipeline.

[0006] Furthermore, the reaction chamber is annular cylindrical, and the ultraviolet lamp is positioned at the center of the central axis of the reaction chamber.

[0007] Furthermore, a temperature sensor and a cooling fan are installed inside the reaction chamber.

[0008] Furthermore, a pressure sensor is installed inside the reaction chamber.

[0009] Furthermore, the ozone generating device includes a pair of discharge electrodes connected to an AC power source.

[0010] Furthermore, a first mass flow controller and an autosampler are connected between the first gas storage cylinder and the circulating gas loop.

[0011] Furthermore, a second mass flow controller is connected between the second gas storage cylinder and the circulating gas loop.

[0012] Furthermore, a circulating pump is connected to the circulating gas circuit.

[0013] The greenhouse gas (GWP) testing method based on the above-mentioned testing apparatus includes the following steps:

[0014] Step 1: Pass the gas to be tested, the background gas, and the reference gas into the reaction chamber. Inject oxygen into the selective permeable gas chamber. The ozone generator converts the oxygen into ozone, which then enters the reaction chamber. Turn on the ultraviolet lamp to irradiate the reaction chamber, causing the gas to be tested, the reference gas, and the ozone to react within the reaction chamber.

[0015] Step 2: Perform GWP parameter testing, which includes the following steps:

[0016] Step 2.1: Inject the gas in the reaction chamber into the infrared path cell of the Fourier transform infrared spectrometer and the capillary of the gas chromatograph-mass spectrometer. Obtain a gas chromatogram through the gas chromatograph-mass spectrometer and calculate and analyze the concentration changes of the analyte gas and the reference gas in the reaction chamber.

[0017] Step 2.2: Based on the infrared spectrum of the gas to be tested obtained in Step 2.1, calculate the transmittance parameter of the gas to be tested, and then calculate the infrared absorption cross section of the gas to be tested based on the transmittance parameter to obtain the radiation efficiency of the gas to be tested; by detecting the initial and final concentrations of the gas to be tested and the reference gas, and combining the reaction rate constant of the reference gas, obtain the reaction rate constant of the gas to be tested and the atmospheric lifetime of the gas to be tested, and calculate the GWP value of the gas to be tested based on the radiation efficiency and atmospheric lifetime of the gas to be tested.

[0018] Furthermore, step 2.2 includes the following steps:

[0019] 2.2.1 Calculation of radiation efficiency (RE):

[0020] The transmittance parameters of the gas to be tested are obtained by infrared spectroscopy, and the infrared absorption cross section of the gas to be tested is calculated based on the transmittance parameters. Based on the infrared absorption cross section and radiation efficiency calculation model of the gas to be measured The radiation efficiency of the gas to be tested is obtained;

[0021] in, The radiative forcing per square centimeter per unit absorption cross section in absorption band i;

[0022] 2.2.2 Calculation of the atmospheric lifetime of the test gas: By testing the changes in the concentration of each gas component under ultraviolet light irradiation in the ozone environment within 1h-24h, and combining the Arrhenius equation, the reaction rate constant of the test gas is obtained; the atmospheric lifetime of the test gas is calculated based on the reaction rate constant of the test gas and the atmospheric lifetime of the reference compound.

[0023] 2.2.3 Calculation of GWP value: The radiation efficiency RE is corrected by using the S-type lifetime correction factor. Based on the atmospheric lifetime of the gas to be tested and the corrected radiation efficiency RE, and based on the GWP calculation formula, the GWP value of the gas to be tested is calculated.

[0024] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0025] The gas chamber of this invention is a selective permeable gas chamber. An ozone generator produces ozone which enters the reaction chamber. The test gas, background gas, and reference gas are connected to the reaction chamber via a circulating gas loop. This allows the reaction chamber to simulate atmospheric conditions and is easy to operate, suitable for testing various gases. Simultaneously, an ultraviolet lamp is provided, enabling the test gas to circulate under enhanced reaction conditions. These enhanced conditions accelerate the reaction, shortening the testing time, and allowing analysis of the decomposition and destruction rates of different gas molecules in the atmospheric environment. Combined with infrared and gas chromatographic analysis of the corresponding gas compounds, the transmittance parameter of the test gas is obtained from the infrared spectrum, and the concentration changes of the test gas and reference gas are obtained from the gas chromatographic analysis. Based on the transmittance parameter and the concentration changes of the test gas and reference gas, the GWP value of the test gas can be calculated, providing a hardware foundation for further research on greenhouse gases.

[0026] Furthermore, the reaction chamber is annular cylindrical, and the ultraviolet lamp is positioned at the center of the central axis of the reaction chamber, so that the ultraviolet light can evenly irradiate the reaction chamber, making the gas reaction in the reaction chamber more closely resemble the real situation.

[0027] Furthermore, a cooling fan and a temperature sensor are installed inside the reaction chamber to maintain the gas to be tested in the reaction chamber at a constant temperature. Simultaneously, the fan cooling system prevents the formation of water mist on the sidewalls of the reaction chamber, thus avoiding any impact on light transmittance.

[0028] Furthermore, the present invention is simple and compact in design, small in size, and can accurately mix and control gas through a gas flow control device and an autosampler.

[0029] Furthermore, the gas injection line is equipped with a mass flow controller to prevent excessive pressure from causing the reaction chamber to rupture, ensuring high safety.

[0030] Furthermore, a pressure sensor is installed in the reaction chamber to detect and report the pressure inside, maintaining it at a constant pressure. This ensures that each chemical reaction begins at the same pressure in the initial stage and also facilitates the detection of leaks.

[0031] The testing method described in this invention involves mixing and reacting the test gas, background gas, and reference gas, then measuring the infrared spectrum and phase chromatogram of the test gas. The transmittance parameter is obtained from the infrared spectrum, and the infrared absorption cross section is calculated using this parameter to obtain the radiation energy efficiency (GWP). The concentrations of the test gas and reference gas are obtained from the phase chromatogram. By combining the initial and final concentrations of the test gas and reference gas with the reaction rate constant of the reference gas, the reaction rate constant and atmospheric lifetime of the test gas are obtained. Finally, the GWP value of the test gas is calculated. This provides a feasible and convenient scheme for measuring the GWP of gases, applicable to the testing of various gases. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a greenhouse gas (GWP) testing device used in this invention.

[0033] In the attached diagram: 1. Reaction chamber; 2. Ultraviolet lamp; 3. AC power supply; 4. Discharge electrode; 5. Selective permeability gas chamber; 6. Cooling fan; 7. Circulation pump; 8. Temperature sensor; 9. Pressure sensor; 10. Oxygen cylinder; 11. First gas storage cylinder; 12. Second gas storage cylinder; 13. Gas chromatograph-mass spectrometer; 14. Gas chromatograph-mass spectrometer workstation; 15. Fourier transform infrared spectrometer; 16. Infrared workstation; 17. First valve; 18. Second valve; 19. Third valve; 20. Fourth valve; 21. Fifth valve; 22. Sixth valve; 23. First mass flow controller; 24. Second mass flow controller; 25. Third mass flow controller; 26. Autosampler; 27. Gas line; 28. Vacuum pump; 29. ​​Third gas storage cylinder; 30. Seventh valve; 31. Water inlet. Detailed Implementation

[0034] To make the objectives and technical solutions of this invention clearer and easier to understand, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0035] Example 1

[0036] Reference Figure 1 A greenhouse gas (GWP) testing device includes a reaction chamber 1 simulating atmospheric reaction, an ultraviolet lamp 2, a selectively permeable gas chamber 5, a cooling fan 6, a circulating pump 7, a temperature sensor 8, a pressure sensor 9, an oxygen cylinder 10, a first gas storage cylinder 11, a second gas storage cylinder 12, a gas chromatograph-mass spectrometer 13, a Fourier transform infrared spectrometer 15, a first mass flow controller 23, a second mass flow controller 24, a third mass flow controller 25, an autosampler 26, a gas pipeline 27, and a vacuum pump 28.

[0037] The reaction chamber 1 is a ring-shaped cylinder made of transparent quartz glass. One ultraviolet lamp (2 tubes) is positioned at the center of the reaction chamber 1's central axis. A cooling fan (6) is positioned at the top of the reaction chamber 1's central axis. Two layers of shielding are installed outside the reaction chamber 1 to prevent ultraviolet light leakage. The reaction chamber 1 provides space for the mixing and reaction of the gas to be tested. The temperature and pressure within the reaction chamber 1 are monitored by temperature sensors (8) and pressure sensors (9) on the walls of the reaction chamber 1, and regulated by the cooling fan (6). A circulating gas loop is formed at both ends of the reaction chamber 1 via pipelines (27), with a circulating pump (7) connected in series in the loop. A selective permeable gas chamber (5) is built into the side wall of the reaction chamber 1, containing a pair of discharge electrodes (4) connected to a 220V AC power supply (3). The selective permeable gas chamber (5) allows small molecule gases such as oxygen or ozone to pass through, but not reference gas, background gas, or the gas to be tested. A water inlet (31) is located at the top of the reaction chamber 1; water is used to maintain a certain humidity level in the reaction chamber 1 and react with oxygen free radicals to form hydroxyl free radicals.

[0038] One end of the third mass flow meter 25 is connected to the oxygen cylinder 10, and the other end is connected to the selective permeability chamber 5; ozone is generated by discharge in the selective permeability chamber 5 and diffuses through the selective permeability chamber 5 into the reaction chamber 1; an external vacuum pump 28 and an autosampler 26 are connected to the gas circuit to inject the gas to be tested and the reference gas into the reaction chamber 1; one end of the first mass flow controller 23 is connected to the circulating gas circuit, and the other end is connected to the first gas storage cylinder 11, which is used to store the gas to be tested; the second mass flow controller... One end of the controller 24 is connected to the circulating gas circuit, and the other end is connected to the second gas storage bottle 12, which is used to store background gas; the outlet end of the autosampler 26 is connected to the circulating gas circuit, and the inlet end is connected to the gas path of the first gas storage bottle 11 and the fourth gas storage bottle 29; a gas chromatograph-mass spectrometer 13 and a Fourier transform infrared spectrometer 15 are connected in parallel on the gas circuit, the gas chromatograph-mass spectrometer 13 is connected to the gas chromatograph-mass spectrometer workstation 14, and the Fourier transform infrared spectrometer 15 is connected to the infrared workstation 16.

[0039] Valves are used as auxiliary accessories for flow regulation and sealing control. The first valve 17 and the second valve 18 are respectively installed on the inlet pipes of the infrared spectrometer 15 and the gas chromatograph-mass spectrometer 13; the third valve 19 is installed on the inlet pipe between the oxygen cylinder 10 and the selective permeability chamber 5; the fourth valve 20 is installed on the outlet pipes of the infrared spectrometer 15 and the gas chromatograph-mass spectrometer 13; the fifth valve 21 is installed on the inlet pipe of the vacuum pump 28; and the sixth valve 22 is installed on the inlet pipe of the autosampler 26. The seventh valve 30 is installed on the pipe connecting the third gas storage cylinder 29 and the inlet of the autosampler 26.

[0040] The design principle of the above structure is as follows: the reaction chamber 1 serves as the reaction space for the mixture of the test gas, reference gas, and background gas; the reaction chamber 1 is surrounded by two layers of shielding to prevent ultraviolet light leakage; the ultraviolet lamp is placed in the center of the central axis of the reaction chamber 1 to provide ultraviolet illumination for the gas mixture inside the reaction chamber 1, promoting gas reaction, and is controlled by a switch device located outside the reaction chamber 1 for "start / stop"; the temperature of the gas inside the reaction chamber 1 is monitored by a temperature sensor 8 installed on the tube wall and fed back to the controller, which controls the speed of the cooling fan 6 according to the real-time temperature, thereby regulating the temperature and maintaining the gas inside the reaction chamber 1 at a constant temperature, facilitating comparison with the reaction rate of the reference gas. The background gas is an inert gas such as helium or nitrogen, and the reference gas is a standard gas substance, which is injected into the gas chamber together with the test gas and undergoes a similar chemical reaction with the test gas to calibrate the atmospheric lifetime of the test gas.

[0041] The two ends of the reaction chamber 1 are connected by pipeline 27 to form a circulating gas loop.

[0042] A circulating pump 7 is connected in series in the circulating gas circuit to provide mechanical power for the flow and thorough mixing of gas in the annular cylindrical reaction chamber.

[0043] The pressure of the gas inside reaction chamber 1 is monitored and fed back by pressure sensor 9 installed on the pipe wall. The pressure within the reaction system is maintained at a constant level by controlling the operation of the cooling fan. This ensures that each chemical reaction begins at the same pressure in the initial stage and also facilitates the detection of leaks.

[0044] An external vacuum pump 28 is connected to the circulating gas circuit to remove impurity gases in the reaction chamber 1 before injecting the gas to be tested, so as to maintain the reaction chamber 1 in a vacuum state, and to control the "start / stop" of the vacuum pump 28 through a switching device.

[0045] Oxygen cylinder 10 injects O2 into selectively permeable gas chamber 5. After the AC power supply 3 is turned on, ozone is generated under the action of discharge electrode 4. Ozone passes through selectively permeable gas chamber 5 and enters reaction chamber 1 as a reactant. After ozone photolysis, it provides oxygen free radicals for the entire system. Oxygen free radicals react with water to form hydroxyl free radicals. Hydroxyl free radicals are used to react with the gas to be tested. Ozone generation is controlled by the switch of AC power supply 3 to "start / stop".

[0046] A first mass flow controller 23 and an autosampler 26 are configured on the circulating gas loop for injecting the analyte gas and reference gas into the reaction chamber 1. The autosampler 26 is equipped with a six-way sampling valve. Under pressure, the analyte gas and reference gas pass through the six-way sampling valve into the quantitative loop. After injection, the rotor of the six-way sampling valve automatically rotates 60 degrees, at which point the chromatographic carrier gas, consistent with the background gas, connects to the quantitative loop, injecting the gas from the quantitative loop into the reaction chamber 1. The entire injection process is automatically controlled, allowing for quantitative control of the amount of analyte gas injected.

[0047] The circulating gas loop is also equipped with a second mass flow controller 24, which is used to inject background gas into the reaction chamber 1 and control and display the inlet flow rate of the background gas, and can quantitatively control the amount of background gas injected into the reaction chamber 1.

[0048] To monitor and analyze the composition, content changes, and related parameters of the gas within reaction chamber 1 in real time, a gas chromatograph-mass spectrometer 13 and a Fourier transform infrared spectrometer 15 are connected in parallel to the circulating gas loop. The Fourier transform infrared spectrometer 15 is used to test the infrared spectrum of the analyte gas, obtaining transmittance parameters. These transmittance parameters are then used to calculate the infrared absorption cross section of the analyte gas, obtaining data such as radiation efficiency, providing relevant parameters for calculating the GWP value. The gas chromatograph-mass spectrometer 13 is responsible for detecting the gas chromatograms and concentration changes of the analyte gas and the reference gas. By detecting the initial and final concentrations of the gas and combining this with the reaction rate constant of the reference gas, the reaction rate constant and atmospheric lifetime of the analyte gas are obtained, providing relevant parameters for calculating the GWP value.

[0049] This invention features a modular design integrating ozone generation, optical reaction, temperature control, concentration control, sampling, detection, and flow control systems. This allows for rapid setup of an experimental platform based on specific requirements, offering flexible configuration. The various functional modules are connected via quick-connect interfaces, enabling easy expansion as needed.

[0050] Example 2

[0051] A GWP testing method based on the above-mentioned greenhouse gas GWP testing device includes two steps: gas mixing and GWP-related parameter testing.

[0052] Step 1, gas mixing, specifically includes the following steps:

[0053] Step 1.1: The test gas perfluoroisobutyronitrile, the reference gas CF3CH2F and the reference gas CF3CH2CHF2 are connected to the reaction chamber 1 through the gas path of the autosampler 26, the test gas is connected to the gas circuit of the first mass flow controller 23, and the oxygen is connected to the selective permeability gas chamber 5.

[0054] Step 1.2: Confirm that all valves of the test device are in the correct position and have good sealing. Put the fifth valve 21 in the open position, turn on the switch control device of the vacuum pump 28 to remove the gas in the reaction chamber 1, and read the vacuum degree through the gas pressure sensor 9.

[0055] Step 1.3: Turn on the second mass flow controller 24, fill the gas circuit with background gas, turn it off and then evacuate the gas circuit several times to remove any impurities that may be present in the reaction chamber 1; turn off the fifth valve 21 and the switch control device of the vacuum pump 28. Open the water inlet and inject water into the reaction chamber 1.

[0056] Step 1.4: Turn on the second gas flow control device 24 and adjust the gas flow rate to control the flow rate of the background gas entering the reaction chamber 1 to prevent excessive background gas injection. If the pressure in the reaction chamber 1 rises sharply and causes the reaction chamber 1 to rupture, the background gas is used to dilute the concentration of the reaction gas. Inject background gas into the gas circuit to the set pressure.

[0057] Step 1.5: Open the gas circuit valves for the gas to be tested and the reference gas respectively, and inject the gas to be tested and the reference gas into the gas circuit through the autosampler 26.

[0058] Step 1.7: Open the third valve 19 and the third mass flow controller 25 to inject oxygen into the selective permeable gas chamber 5. The oxygen is converted into ozone in the selective permeable gas chamber 5 and the mixed gas in the reaction chamber 1 reaches a certain pressure, which does not exceed 200 Torr.

[0059] Step 1.6: Turn on the circulation pump 7 to ensure that the gas in the reaction chamber 1 is fully mixed.

[0060] Step 2, GWP related parameter testing, specifically includes the following steps:

[0061] Step 2.1: Open the first valve 17 on the inlet pipe of the infrared optical path cell of the Fourier transform infrared spectrometer 15 and the fifth valve 21 on the gas circuit, while simultaneously closing the fourth valve 20 on the gas circuit. Inject the gas (analyte gas, reference gas, background gas, and ozone) from the reaction chamber 1 into the infrared optical path cell. After the injection is complete, close the first valve 17 and the fifth valve 21. According to the experimental requirements, use the infrared spectroscopy workstation 16 to control the Fourier transform infrared spectrometer 15 to test the infrared spectrum of the analyte gas.

[0062] Step 2.2: Turn on the AC power supply 3. After the discharge electrode 4 discharges oxygen in the selective permeability chamber 5, ozone is generated. The ozone passes through the selective permeability chamber 5 and enters the reaction chamber 1. Turn on the ultraviolet lamp 2 to irradiate the entire reaction chamber 1, causing a reaction between the test gas, reference gas, and ozone within the reaction chamber 1. Turn on the cooling fan 6 to control the constant temperature of the system. At this time, the mixed gas in the reaction chamber 1 will react under enhanced reaction conditions, shortening the test time. Throughout the process, the circulation pump 7 promotes the circulation of the mixed gas in the reaction chamber 1.

[0063] Step 2.3: Open the second valve 18 on the inlet pipe of the gas chromatograph-mass spectrometer 13 and the fifth valve 21 on the gas circuit, and simultaneously open the first valve 20 on the gas circuit to inject the gas in reaction chamber 1 into the quantitative loop of the gas chromatograph-mass spectrometer 13. After the gas injection is completed, close the second valve 18, the fifth valve 21, and the fourth valve 20. Depending on the retention time of the gas in the gas chromatograph-mass spectrometer 13, the testing frequency can generally be set to once every 10 min, 15 min, 20 min, or 30 min. Obtain the gas chromatogram through the gas chromatograph workstation 14, detect and analyze the concentration changes of the analyte gas and the reference gas in reaction chamber 1, observe the concentration changes of the analyte gas and the type and concentration of the product gas. The concentration changes of the analyte gas and the type and concentration of the product gas can be used to determine whether the analyte has decomposed. If no product that does not belong to the analyte gas or the reference gas is detected, it indicates that the concentration change is caused by poor airtightness of the monitoring device, and the gas circuit should be checked and the test should be repeated.

[0064] Step 2.4: Calculate GWP related parameters.

[0065] The transmittance parameter T of the perfluoroisobutyronitrile (PFOS) gas was obtained by measuring its infrared spectrum, and then the infrared absorption cross section σ was calculated using the transmittance parameter T. av Data such as radiation efficiency (RE) were obtained; the initial concentration [GHG]0 and final concentration [GHG] of the gas to be tested were detected. t Combined with the reaction rate constant k of the reference gas Reference The reaction rate constant k of the gas to be tested is obtained. GHG The atmospheric lifetime τ of the gas to be tested provides relevant parameters for calculating the GWP value.

[0066] 2.4.1 Calculation of radiation efficiency (RE):

[0067] The transmittance parameter T of the gas to be tested was obtained by infrared spectroscopy, and then combined with Lambert-Beer's law. and the Pinnock radiation energy efficiency calculation model The radiation efficiency (RE) of perfluoroisobutyronitrile (PFOS) was obtained.

[0068] In the above formula, N is the number of molecules per square centimeter, and L is the optical path length of the infrared cell. σ is the infrared absorption cross section of the gas to be measured in absorption band i. av , (W m -2 (cm -1 ) -1 (cm 2 molecules -1 ) -1 The value represents the radiative forcing per square centimeter per unit absorption cross section in absorption band i, which can be obtained by consulting relevant literature.

[0069] 2.4.2 Calculation of the atmospheric lifetime of the gas to be tested: By testing the changes in the concentration of each gas component in the ozone environment under ultraviolet light irradiation within 1h-24h, and combining the Arrhenius equation... The reaction rate constant k of the gas to be tested is obtained. GHG Further based on the formula The atmospheric lifetime τ of the gas to be tested is obtained.

[0070] Among them, D n D is a correction factor used to explain reactant losses caused by gas chromatography sampling. n =nln0.9983, [Reference]0 is the initial concentration of the reference gas, [Reference] t The final concentration of the reference gas, n is the number of samplings, and k MCF Let τ be the reaction rate constant of the reference compound trichloroethane. MCF The atmospheric lifetime of the reference compound trichloroethane can be obtained by consulting the literature.

[0071] 2.4.3 Calculation of GWP value: Using S-type life correction factor The data is corrected for RE using the following formula:

[0072] Based on the atmospheric lifetime τ and the corrected radiative efficiency A of the gas to be measured, and using the GWP calculation formula published by the IPCC. The GWP value of the gas to be tested at the corresponding time scale t can be obtained. GHG (t).

[0073] Where A is the corrected radiation efficiency, τ is the atmospheric lifetime of the gas under test, t is the given time range, a, b, c, and d are constants with corresponding values ​​of 2.962, 0.9312, 2.994, and 0.9302, respectively; AGWP(t) is the absolute GWP value of the test gas within the time range t, AGWPco2(t) is the absolute GWP value of carbon dioxide within the time range t, which can be obtained by consulting the IPCC report, and At(·) is the formula for calculating the absolute GWP value.

[0074] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A greenhouse gas GWP test apparatus, characterized by, The application relates to a reaction cavity (1) and a circulating gas loop, wherein the reaction cavity (1) is externally provided with an ultraviolet lamp (2); the circulating gas loop comprises gas pipelines (27) connected with two ends of the reaction cavity (1); the gas pipelines (27) are connected with a gas chromatograph-mass spectrometer (13), a Fourier infrared spectrometer (15), a reference gas pipeline, a first gas storage cylinder (11) for storing a gas to be detected and a second gas storage cylinder (12) for storing a background gas; a selectively permeable gas chamber (5) is arranged in a side wall of the reaction cavity (1); an ozone generating device is arranged in the selectively permeable gas chamber (5); the selectively permeable gas chamber (5) and an oxygen cylinder are connected through pipelines; the ozone generating device comprises a pair of discharge electrodes (4) connected with an alternating current power supply (3); a first mass flow controller (23) and an automatic sampler (26) are arranged between the first gas storage cylinder (11) and the circulating gas loop. The reaction cavity (1) is a circular column, and the ultraviolet lamp (2) is arranged at a middle position of an axis in the reaction cavity (1). A temperature sensor (8) and a heat dissipation fan (6) are arranged in the reaction cavity (1). A pressure sensor (9) is arranged in the reaction cavity (1).

2. The greenhouse gas GWP test device of claim 1, wherein, A second mass flow controller (24) is arranged between the second gas storage cylinder (12) and the circulating gas loop.

3. The greenhouse gas GWP test device of claim 1, wherein, A circulating pump (7) is arranged on the circulating gas loop.

4. The greenhouse gas GWP test device according to claim 1 or 3, characterized in that, The application further discloses a GWP parameter testing method.

5. The greenhouse gas GWP test device of claim 1, wherein, Step 1: the gas to be detected, the background gas and the reference gas are introduced into the reaction cavity (1), oxygen is injected into the selectively permeable gas chamber (5), the ozone generating device converts the oxygen into ozone and introduces the ozone into the reaction cavity (1), the ultraviolet lamp (2) is turned on to irradiate the reaction cavity (1), and reactions occur among the gas to be detected, the reference gas and the ozone in the reaction cavity (1); 6. The greenhouse gas GWP test device of claim 1, wherein, Step 2: GWP parameter testing is carried out, and the testing specifically comprises the following steps:

7. A test method for testing the greenhouse gas GWP of a test device according to any one of claims 1 to 6, characterized in that, Step 2.1: the gas in the reaction cavity (1) is injected into an infrared optical path pool of the Fourier infrared spectrometer (15) and a capillary of the gas chromatograph-mass spectrometer (13), a gas chromatogram is obtained through the gas chromatograph-mass spectrometer (13), and the concentration changes of the gas to be detected and the reference gas in the reaction cavity (1) are calculated and analyzed; Step 2.2: the infrared spectrum of the gas to be detected obtained in step 2.1 is used to calculate the permeability parameter of the gas to be detected, then the infrared absorption cross section of the gas to be detected is calculated according to the permeability parameter of the gas to be detected, the radiation energy efficiency of the gas to be detected is obtained, the initial concentration and the final concentration of the gas to be detected and the reference gas are detected, the reaction rate constant of the reference gas is combined, the reaction rate constant of the gas to be detected and the atmospheric lifetime of the gas to be detected are obtained, and the GWP value of the gas to be detected is calculated according to the radiation energy efficiency and the atmospheric lifetime of the gas to be detected. Step 2.2 comprises the following steps: 2.2.1: calculating the radiation energy efficiency RE: ​ 8. The test method for determining the greenhouse gas GWP of a test device according to claim 7, wherein, ​ ​ The infrared spectrum test obtains the gas permeability parameter of the to-be-tested gas, and the infrared absorption cross section of the to-be-tested gas is calculated according to the gas permeability parameter of the to-be-tested gas The infrared absorption cross section of the to-be-tested gas and the radiation energy efficiency calculation model are obtained The radiation energy efficiency of the to-be-tested gas is obtained wherein, F is the radiative forcing per square centimeter per unit absorption cross section in the absorption band i; 2.2.2, Calculate the atmospheric lifetime of the test gas: by testing the change of the concentration of each gas component in the ozone environment under ultraviolet irradiation within 1h-24h, combined with Arrhenius formula, the reaction rate constant of the test gas is obtained; according to the reaction rate constant of the test gas and the atmospheric lifetime of the reference compound, the atmospheric lifetime of the test gas is calculated; 2.2.3, Calculate the GWP value: the data of radiant energy efficiency RE is corrected by using S-type lifetime correction coefficient, according to the atmospheric lifetime of the test gas and the corrected radiant energy efficiency RE, and based on the GWP calculation formula, the GWP value of the test gas is calculated.

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