Greenhouse gas carbon dioxide isotope standard material gas distribution system and method

Abstract

The present invention discloses a greenhouse gas carbon dioxide isotope standard material gas distribution system and method, which relates to the technical field of gas distribution equipment. The vacuum element is located at the beginning of the connecting pipeline and can be connected to the connecting pipeline. The industrial source carbon dioxide raw gas is stored in the raw gas storage component, and the pure gas is stored in the pure gas storage component. The raw gas storage component, the pure gas storage component and the quantitative bottle are all provided with a switch valve that can control the connection and disconnection between the connecting pipeline. The target gas storage component is located at the end of the connecting pipeline and can be connected to the connecting pipeline. The pressure detection element is located between the quantitative bottle and the target gas storage component, and the weight detection element is located at the lower end of the target gas storage component. A stop valve is also provided on the connecting pipeline, and the stop valve is located between the pressure detection element and the target gas storage component. The present invention can improve the atmospheric CO2 concentration and δ 13 The quality of C observation data can clarify the different sources of CO2 and provide effective measurement support for controlling the growth of regional CO2 concentration and formulating scientific emission reduction policies.

Description

Technical Field

[0001] The present invention relates to the technical field of gas distribution equipment, and in particular to a greenhouse gas carbon dioxide isotope standard material gas distribution system and method. Background Art

[0002] As the CO2 concentration increases, the relative difference between the carbon isotope ratio in CO2 and the standard value - δ 13 The C value decreases year by year, which is mainly caused by the widespread use of fossil fuels such as coal, oil, and natural gas. This shows that the abundance of stable isotopes in nature and their changing mechanism can guide us to study the source, migration process, and physical and chemical processes of substances, which has important guiding significance for scientific assessment of current environmental changes.

[0003] However, the rate of change of atmospheric CO2 isotope content is extremely small, and it is only meaningful when the measurement data is accurate and reliable. The accuracy of the mass value of carbon dioxide isotope standard material is required to be high, mainly because the calibrated data will be used for the inversion calculation of the global carbon cycle process, and even a small difference will lead to huge errors in the estimation of carbon sources and carbon sinks. Studies have shown that δ 13 A 2.83‰ difference in C value will result in a CO2 concentration error of 0.015μmol / mol. The distribution of CO2 and its stable carbon isotopes has regional differences, and the changes in their concentrations can reflect the extent to which the atmosphere in different regions is affected by natural and human activities. 13 C can be used to estimate photosynthesis, soil respiration, fossil fuel combustion, etc.

[0004] High-precision CO2 standard gas has a wide range of social and economic needs in the current process of promoting the dual carbon goals. In addition to accurate concentration, high-precision CO2 also requires δ 13 The C isotope composition is close to the target to be measured. However, the isotope composition of high-purity CO2 industrial raw gas deviates greatly from that in the atmosphere, and the mass of CO2 isotope material that needs to be added is as low as milligrams or micrograms. The current gravimetric gas distribution technology and equipment cannot guarantee the simultaneous achievement of the two goals of concentration and isotope composition. Summary of the invention

[0005] The purpose of the present invention is to provide a greenhouse gas carbon dioxide isotope standard material gas distribution system and method to solve the problems existing in the above-mentioned prior art and improve the atmospheric CO2 concentration and δ 13 C improves the quality of observation data, clarifies the different sources of CO2, and provides effective measurement support for controlling the growth of regional CO2 concentrations and formulating scientific emission reduction policies.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a greenhouse gas carbon dioxide isotope standard material gas distribution system, comprising a constant temperature and humidity chamber, and a connecting pipeline, a vacuum pumping element, a raw gas storage component, a pure gas storage component, a quantitative bottle, a pressure detection element, a target gas storage component and a weight detection element located in the constant temperature and humidity chamber, wherein the vacuum pumping element is located at the beginning of the connecting pipeline and can be communicated with the connecting pipeline, the raw gas storage component is used to store industrial source carbon dioxide raw gas, the pure gas storage component is used to store pure gas, the raw gas storage component, the pure gas storage component and the quantitative bottle are each provided with a switch valve capable of controlling the connection and disconnection between the connecting pipeline, the target gas storage component is located at the end of the connecting pipeline and can be communicated with the connecting pipeline, the pressure detection element is located between the quantitative bottle and the target gas storage component and is used to detect the pressure in the connecting pipeline, the weight detection element is located at the lower end of the target gas storage component, and a stop valve is further provided on the connecting pipeline, and the stop valve is located between the pressure detection element and the target gas storage component.

[0008] Preferably, the connecting pipeline is a stainless steel vacuum pipeline, and the vacuum pumping element is a molecular pump.

[0009] Preferably, the raw gas storage component is a raw gas cylinder, the pure gas storage component is a pure gas cylinder, and the target gas storage component is a target gas cylinder.

[0010] Preferably, the pure gas in the pure gas storage element is 13 CO2 or 12 CO2 pure gas.

[0011] Preferably, the pressure detection element is a precision pressure gauge, and the minimum scale of the precision pressure gauge is 1Pa, and the accuracy is 0.02%; the weight detection element is a precision balance.

[0012] Preferably, the pure gas storage component is located between the raw gas storage component and the quantitative bottle, and the quantitative bottle is located between the pure gas storage component and the target gas storage component.

[0013] The present invention also provides a method for distributing greenhouse gas carbon dioxide isotope standard material, using a greenhouse gas carbon dioxide isotope standard material distribution system as described in any one of the above technical solutions, comprising the following steps:

[0014] S1. Use vacuum pumping components to evacuate the greenhouse gas carbon dioxide isotope standard material gas distribution system;

[0015] S2. Close the stop valve, the switch valve at the raw gas storage part and the switch valve at the target gas storage part, and open the switch valve at the pure gas storage part and the switch valve at the quantitative bottle, and pass the pure gas in the pure gas storage part into the quantitative bottle, while observing the reading of the pressure detection element to accurately control the amount of pure gas entering the quantitative bottle;

[0016] S3. After the pure gas is introduced, close the switch valve at the pure gas storage part, open the stop valve, and pass the pure gas in the quantitative bottle into the target gas storage part;

[0017] S4. Open the switch valve at the raw gas storage part, and use the industrial source carbon dioxide raw gas in the raw gas storage part to flush the quantitative bottle, so that all the pure gas in the quantitative bottle enters the target gas storage part, close the switch valve at the quantitative bottle, and observe the reading of the weight detection element;

[0018] S5. Calculate the carbon value in the target gas storage component based on the reading of the weight detection element and the reading of the pressure detection element, and compare the calculated carbon value with the designed carbon value to obtain the difference, directly pass the industrial source carbon dioxide raw gas in the raw gas storage component into the target gas storage component, and control the introduction amount based on the difference until the reading of the observed weight detection element reaches the designed reading.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The greenhouse gas carbon dioxide isotope standard material gas distribution system and method provided by the present invention comprises the following steps: a vacuum pumping element is located at the beginning of a connecting pipeline and can be communicated with the connecting pipeline; a raw gas storage element is used to store industrial source carbon dioxide raw gas; a pure gas storage element is used to store pure gas; the raw gas storage element, the pure gas storage element and the quantitative bottle are each provided with a switch valve capable of controlling the on-off connection with the connecting pipeline; the quantitative bottle is a small-volume quantitative bottle; the target gas storage element is located at the end of the connecting pipeline and can be communicated with the connecting pipeline; a pressure detection element is located between the quantitative bottle and the target gas storage element and is used to detect the pressure in the connecting pipeline; a weight detection element is located at the lower end of the target gas storage element; and the purpose of ultra-trace gas transfer is achieved by a control method combining the pressure detection element and the small-volume quantitative bottle; and the δ of CO2 is coordinated with the weight method by setting the weight detection element. 13 C value, to achieve the goal of combining the weight method and volume method to prepare the carbon dioxide isotope standard material, a stop valve is also provided on the connecting pipeline, the stop valve is located between the pressure detection element and the target gas storage component, to control the flow of gas, so as to achieve accurate control of the gas volume. The present invention improves the atmospheric CO2 concentration and δ 13 The quality of C observation data can be clarified to clarify the different sources of CO2, meet the needs of sample analysis and testing in current ecological environment, climate change and other research, and provide effective metrological support for controlling the growth of regional CO2 concentration and formulating scientific emission reduction policies. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The greenhouse gas carbon dioxide isotope standard material gas distribution system provided in the first embodiment;

[0023] In the figure: 1-constant temperature and humidity chamber, 2-weight detection element, 3-target gas storage component, 4-stop valve, 5-pressure detection element, 6-quantitative bottle, 7-pure gas storage component, 8-raw gas storage component, 9-vacuum element, 10-connecting pipeline. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a greenhouse gas carbon dioxide isotope standard material gas distribution system and method to solve the problems existing in the prior art and improve the atmospheric CO2 concentration and δ 13 C improves the quality of observation data, clarifies the different sources of CO2, and provides effective measurement support for controlling the growth of regional CO2 concentrations and formulating scientific emission reduction policies.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0027] like Figure 1As shown, this embodiment provides a greenhouse gas carbon dioxide isotope standard material gas distribution system, including a constant temperature and humidity chamber 1, and a connecting pipeline 10, a vacuum element 9, a raw gas storage component 8, a pure gas storage component 7, a quantitative bottle 6, a pressure detection element 5, a target gas storage component 3 and a weight detection element 2 located in the constant temperature and humidity chamber 1. The humidity in the constant temperature and humidity chamber 1 is ±0.2°C and the humidity is ±0.1%RH; the vacuum element 9 is located at the beginning of the connecting pipeline 10 and can be connected to the connecting pipeline 10. The raw gas storage component 8 is used to store industrial source carbon dioxide raw gas, the pure gas storage component 7 is used to store pure gas, and the raw gas storage component 8 is used to store pure gas. , a switch valve capable of controlling the on-off between the pure gas storage component 7 and the quantitative bottle 6 and the connecting pipeline 10 is respectively provided, and the quantitative bottle 6 is a small-volume quantitative bottle 6, the target gas storage component 3 is located at the end of the connecting pipeline 10 and can be communicated with the connecting pipeline 10, the pressure detection element 5 is located between the quantitative bottle 6 and the target gas storage component 3 and is used to detect the pressure in the connecting pipeline 10, the weight detection element 2 is located at the lower end of the target gas storage component 3, and then the purpose of ultra-trace gas transfer is achieved through the control mode of combining the pressure detection element 5 and the small-volume quantitative bottle 6, and then the weight detection element 2 is set to realize the coordinated regulation of the δ of CO2 in combination with the weight method. 13 C value, to achieve the goal of combining the weight method and the volume method to prepare the carbon dioxide isotope standard material, the connecting pipeline 10 is also provided with a stop valve 4, the stop valve 4 is located between the pressure detection element 5 and the target gas storage component 3, and controls the flow of gas to achieve accurate control of the gas volume. The present invention improves the atmospheric CO2 concentration and δ 13 The quality of C observation data can be clarified to clarify the different sources of CO2, meet the needs of sample analysis and testing in current ecological environment, climate change and other research, and provide effective metrological support for controlling the growth of regional CO2 concentration and formulating scientific emission reduction policies.

[0028] Specifically, the connecting pipeline 10 is a stainless steel vacuum pipeline, and the vacuum element 9 is a molecular pump, which can achieve a high vacuum degree.

[0029] The raw gas storage component 8 is a raw gas cylinder, the pure gas storage component 7 is a pure gas cylinder, and the target gas storage component 3 is a target gas cylinder.

[0030] The pure gas in the pure gas storage element 7 is 13 CO2 or 12 CO2 pure gas.

[0031] The pressure detection element 5 is a precision pressure gauge, and the minimum scale of the precision pressure gauge is 1Pa, and the accuracy is 0.02%; the weight detection element 2 is a precision balance.

[0032] The pure gas storage component 7 is located between the raw gas storage component 8 and the quantitative bottle 6 , and the quantitative bottle 6 is located between the pure gas storage component 7 and the target gas storage component 3 .

[0033] In this embodiment, through the above design, for δ 13 The adjustment range of C is -60‰~10‰, 13 The minimum amount of CO2 added can reach microgram level, and the expanded uncertainty of the concentration value is ≤0.1%. Example

[0034] This embodiment provides a method for dispensing greenhouse gas carbon dioxide isotope standard material, using the greenhouse gas carbon dioxide isotope standard material dispensing system in Embodiment 1, including the following steps:

[0035] S1. Use the vacuum element 9 to evacuate the greenhouse gas carbon dioxide isotope standard material gas distribution system to avoid the residual gas in the greenhouse gas carbon dioxide isotope standard material gas distribution system affecting subsequent measurements;

[0036] S2. Close the stop valve 4, the switch valve at the raw gas storage 8 and the switch valve at the target gas storage 3, and open the switch valve at the pure gas storage 7 and the switch valve at the quantitative bottle 6, and pass the pure gas in the pure gas storage 7 into the quantitative bottle 6, and at the same time, by observing the reading of the pressure detection element 5, obtain the pressure in the connecting pipeline 10 between the stop valve 4 and the quantitative bottle 6, so as to accurately control the amount of pure gas entering the quantitative bottle 6;

[0037] S3. After the pure gas is passed through, close the switch valve at the pure gas storage member 7, open the stop valve 4, and pass the pure gas in the quantitative bottle 6 into the target gas storage member 3;

[0038] S4. To ensure that the pure gas in the quantitative bottle 6 can be completely transferred to the target gas storage part 3, the switch valve at the raw gas storage part 8 is opened, and the industrial source carbon dioxide raw gas in the raw gas storage part 8 is used to flush the quantitative bottle 6, so that the pure gas in the quantitative bottle 6 enters the target gas storage part 3, the switch valve at the quantitative bottle 6 is closed, and the reading of the weight detection element 2 is observed to obtain the weight of the gas entering the target gas storage part 3;

[0039] S5. Calculate the carbon value in the target gas storage component 3 according to the reading of the weight detection element 2 and the reading of the pressure detection element 5, and compare the calculated carbon value with the designed carbon value to obtain the difference, that is, how much carbon needs to be added to the target gas storage component 3, and directly pass the industrial source carbon dioxide raw gas in the raw gas storage component 8 into the target gas storage component 3, and control the introduction amount according to the difference, until the reading of the weight detection element 2 reaches the designed reading, and then stop, and complete the preparation of the mixed gas.

[0040] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A greenhouse gas carbon dioxide isotope standard material gas distribution system, characterized by: The invention comprises a constant temperature and humidity chamber, and a connecting pipeline, a vacuum pumping element, a raw gas storage component, a pure gas storage component, a quantitative bottle, a pressure detection element, a target gas storage component and a weight detection element located in the constant temperature and humidity chamber, wherein the vacuum pumping element is located at the beginning of the connecting pipeline and can be communicated with the connecting pipeline, the raw gas storage component is used to store industrial source carbon dioxide raw gas, the pure gas storage component is used to store pure gas, and the raw gas storage component, the pure gas storage component and the quantitative bottle are each provided with a switch valve capable of controlling the connection and disconnection between the connecting pipeline and the raw gas storage component, The target gas storage component is located at the end of the connecting pipeline and can be communicated with the connecting pipeline, the pressure detection element is located between the quantitative bottle and the target gas storage component and is used to detect the pressure in the connecting pipeline, the weight detection element is located at the lower end of the target gas storage component, and a stop valve is also provided on the connecting pipeline, and the stop valve is located between the pressure detection element and the target gas storage component; the pure gas storage component is located between the raw gas storage component and the quantitative bottle, and the quantitative bottle is located between the pure gas storage component and the target gas storage component; The method for dispensing greenhouse gas carbon dioxide isotope standard material using a greenhouse gas carbon dioxide isotope standard material dispensing system comprises the following steps: S1. Use vacuum pumping components to evacuate the greenhouse gas carbon dioxide isotope standard material gas distribution system; S2. Close the stop valve, the switch valve at the raw gas storage part and the switch valve at the target gas storage part, and open the switch valve at the pure gas storage part and the switch valve at the quantitative bottle, and pass the pure gas in the pure gas storage part into the quantitative bottle, while observing the reading of the pressure detection element to accurately control the amount of pure gas entering the quantitative bottle; S3. After the pure gas is introduced, close the switch valve at the pure gas storage part, open the stop valve, and pass the pure gas in the quantitative bottle into the target gas storage part; S4. Open the switch valve at the raw gas storage part, and use the industrial source carbon dioxide raw gas in the raw gas storage part to flush the quantitative bottle, so that all the pure gas in the quantitative bottle enters the target gas storage part, close the switch valve at the quantitative bottle, and observe the reading of the weight detection element; S5. Calculate the carbon value in the target gas storage component based on the reading of the weight detection element and the reading of the pressure detection element, and compare the calculated carbon value with the designed carbon value to obtain the difference, directly pass the industrial source carbon dioxide raw gas in the raw gas storage component into the target gas storage component, and control the introduction amount based on the difference until the reading of the observed weight detection element reaches the designed reading.

2. The greenhouse gas carbon dioxide isotope standard material gas distribution system according to claim 1, characterized in that: The connecting pipeline is a stainless steel vacuum pipeline, and the vacuum pumping element is a molecular pump.

3. The greenhouse gas carbon dioxide isotope standard material gas distribution system according to claim 1, characterized in that: The raw gas storage component is a raw gas cylinder, the pure gas storage component is a pure gas cylinder, and the target gas storage component is a target gas cylinder.

4. The greenhouse gas carbon dioxide isotope standard material gas distribution system according to claim 1, characterized in that: The pure gas in the pure gas storage element is 13 CO2 or 12 CO2 pure gas.

5. The greenhouse gas carbon dioxide isotope standard material gas distribution system according to claim 1, characterized in that: The pressure detection element is a precision pressure gauge, and the minimum scale of the precision pressure gauge is 1Pa, and the accuracy is 0.02%; the weight detection element is a precision balance.

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