CN113252421B - Device and method for measuring trace carbon isotopes and heavy components in natural gas - Google Patents
Device and method for measuring trace carbon isotopes and heavy components in natural gas Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 224
- 239000003345 natural gas Substances 0.000 title claims abstract description 108
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 209
- 238000001514 detection method Methods 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 6
- 230000008020 evaporation Effects 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 150000001335 aliphatic alkanes Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 238000003916 acid precipitation Methods 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The invention discloses a device and a method for measuring trace carbon isotopes and heavy components in natural gas, and solves the technical problems that the measurement cannot be carried out due to low carbon isotope content, the detection result of the heavy components is inaccurate, and the detection process is complex when the natural gas components are measured in the prior art. The device comprises an air bottle (1), an intermediate container (4), a buffer device (14), a flow meter (5) for measuring the gas flow and a gas chromatograph which are sequentially connected through pipelines; wherein, the outer side of the intermediate container (4) is provided with a temperature control device (3) for regulating and controlling the temperature of the intermediate container (4); the intermediate container (4) is connected with a pressure control device for maintaining the internal pressure constant; and the intermediate container (4) and the buffer device (14) are both connected with a vacuum pump (8). The invention avoids the evaporation loss of the condensed liquid in the transfer process, simplifies the operation and can more accurately determine trace carbon isotopes and heavy components in the natural gas.
Description
Technical Field
The invention belongs to the technical field of natural gas physical property testing, and particularly relates to a device and a method for measuring trace carbon isotopes and heavy components in natural gas.
Background
Natural gas is an important energy source and occupies an important strategic position in the economic development of China. The natural gas is used as an energy source, so that the consumption of coal and petroleum can be reduced, the discharge amount of sulfur dioxide, carbon dioxide, dust and nitrogen oxide is reduced, acid rain can be effectively prevented from forming, the greenhouse effect is slowed down, and the environmental quality is fundamentally improved. Natural gas is a mixed gas existing in underground rock reservoirs, and is mainly hydrocarbons such as methane and ethane. The composition of alkane isotopes in the natural gas can be mastered, so that the determination of the content and the burial depth of the alkane in the natural gas, the cause and the maturity of the natural gas and the like can be facilitated; because the composition of natural gas is relatively complex, the nature of the natural gas can be influenced by the types and the contents of the components, and the economic and safety problems in the development, transportation and processing processes of the natural gas are considered, the accurate metering of the natural gas gradually becomes the key point of attention, and the analysis data of the composition of the natural gas is the basic data in the metering. Therefore, it is necessary to accurately measure trace carbon isotopes and heavy components in the natural gas, understand important physical parameters of the natural gas through composition analysis, and further clarify the properties of the natural gas.
The existing method for measuring carbon isotopes is to directly inject natural gas into an isotope mass spectrometer for analysis, but cannot measure the content of some components in the natural gas when the content of some components in the natural gas is low.
The existing method for measuring the heavy components of the natural gas is to condense and separate the natural gas, gas chromatograph is used for testing gas-liquid phase components in the natural gas, and then the total components of the natural gas are calculated according to the substance balance principle, but the condensate is easy to volatilize, so that the condensate is difficult to ensure that the condensate cannot be lost in the transferring and injecting chromatographic processes, the measuring result is inaccurate, and the whole process of transferring and injecting the condensate is very complicated.
Disclosure of Invention
The invention aims to provide a device for measuring trace carbon isotopes and heavy components in natural gas, and aims to solve the technical problems that in the prior art, when the natural gas components are measured, the carbon isotopes cannot be measured due to low content, the detection result of the heavy components is inaccurate, and the detection process is complex.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a device for measuring trace carbon isotopes and heavy components in natural gas, which comprises a gas cylinder, an intermediate container, a buffer device, a flowmeter for measuring gas flow and a gas component detection device which are sequentially connected through a pipeline; wherein,
a temperature control device for regulating and controlling the temperature of the intermediate container is arranged on the outer side of the intermediate container;
the intermediate container is connected with a pressure control device for maintaining the internal pressure constant;
and the intermediate container and the buffer device are both connected with a vacuum pump.
Further, the pressure control device comprises a pressure control pipeline, a displacement pump and a liquid inlet valve, wherein the displacement pump is connected to one end of the pressure control pipeline, and the other end of the pressure control pipeline is connected with the intermediate container; the liquid inlet valve is connected to the pressure control pipeline.
Further, the temperature control range of the temperature control device is-100 ℃ to 240 ℃.
Further, the temperature control device is a high-low temperature alternating test chamber or a cold-hot bath.
Further, the gas cylinder is communicated with the middle container through a gas inlet pipe, and a pressure reducing valve and a gas inlet valve are sequentially arranged on the gas inlet pipe along the gas inlet direction.
Further, the flowmeter is a turbine flowmeter or a volume flowmeter.
Further, the gas component detection device is a stable isotope ratio mass spectrometer and/or a gas chromatograph.
Furthermore, pipelines between the intermediate container and the gas component detection device are all heat-insulating pipelines.
The invention provides a method for measuring trace carbon isotopes and heavy components in natural gas, which applies the device for measuring trace carbon isotopes and heavy components in natural gas and comprises the following steps:
s1: vacuumizing, wherein a vacuum pump is used for vacuumizing the intermediate container and the buffer device;
s2: sample introduction and condensation are carried out on a sample, a temperature control device is started, and the set temperature is-89.5 to-95 ℃; after the temperature is stable, the natural gas sample in the gas cylinder enters an intermediate container through a pipeline, meanwhile, a pressure control device is utilized to maintain the pressure of the intermediate container constant to be normal pressure, so that light components and heavy components in the natural gas sample are separated from gas and liquid, and the natural gas sample is stopped being injected into the intermediate container when condensate in the intermediate container reaches 8-12 ml;
s3: analyzing the light component gas component, namely, feeding a pump at constant pressure by using a displacement pump, discharging the gas in the intermediate container, feeding the gas into a gas component detection device for detection, and recording the reading of a flowmeter and the result of the gas component detection device (6);
s4: analyzing the components of heavy component gas, setting the temperature of a temperature control device to be 198-210 ℃, after the temperature is stable, feeding the gas into a pump by using a displacement pump at constant pressure, discharging the gas in an intermediate container, detecting the gas in a gas component detection device, and recording the reading of a flowmeter and the result of the gas component detection device;
s5: and (4) calculating the total composition of the sample gas, and calculating the total composition of the natural gas sample according to the substance balance principle by using the results obtained in the step S3 and the step S4.
Further, in step S5, the step of calculating the total composition of the natural gas sample includes:
(ii) calculating the densities of the light component gas and the heavy component gas by the following equation (1)
In formula (1):
-the pressure in the laboratory and the pressure in the laboratory,
；
② calculating the mass of the light component gas and the heavy component gas by the following formula (2)
In formula (2):
the volumes of the light component gas and the heavy component gas recorded by the flow meter in the steps S3 and S4 are respectively recorded as
And
，
；
(iii) calculating the molecular weights of the light component gas and the heavy component gas according to the following formula (3)
In formula (3):
light component gas and heavy component gas detected by gas component detection device (gas chromatograph)
Are respectively recorded as
And
，%；
calculating the mole number of the light component gas and the heavy component gas according to the following formula (4)
In formula (4):
the number of moles of light component gas and heavy component gas, respectively
And
，
；
fifthly, calculating the total composition of the natural gas sample according to the following formula (5)
In formula (5):
in natural gas samples
Mole fraction of components,%;
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
according to the device for measuring the trace carbon isotopes and the heavy components in the natural gas, when the trace carbon isotopes and the heavy components in the natural gas are measured, after the natural gas is injected into the middle container, the temperature of the natural gas is controlled by the temperature control device, the natural gas is condensed and separated by adopting a low-temperature condensation method, condensed gas and liquid are respectively obtained, the obtained gas is called as a light component, the light component gas is detected by the gas component detection device, and the volume of the gas and the detection result of the gas component detection device are recorded; heating and evaporating the condensate in the intermediate container into gas by using a temperature control device for controlling the temperature, wherein the obtained gas is called heavy component, detecting the heavy component gas by using the same gas component detection device, and recording the volume of the gas and the detection result of the gas component detection device; and then, calculating the total components of the natural gas according to a substance balance principle, wherein the measuring method provided by the invention does not directly test the components of the condensate, but evaporates the condensate into gas to test the components of the gas, so that the evaporation loss of the condensed liquid in the transfer process is avoided, the operation is simplified, and the trace carbon isotopes and heavy components in the natural gas can be more accurately measured.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a spectrum diagram of the result of the natural gas sample A detected by the stable isotope ratio mass spectrometer in the comparative example with the ratio as the ordinate;
FIG. 3 is a spectrum diagram of the result of the detection of the stable isotope ratio mass spectrometer with the ion intensity as the ordinate of the natural gas sample A in the comparative example;
FIG. 4 is a spectrum diagram of the result of the natural gas sample B detected by the stable isotope ratio mass spectrometer in the comparative example with the ratio as the ordinate;
FIG. 5 is a spectrum diagram of the result of the detection of the stable isotope ratio mass spectrometer with the ion intensity as the ordinate of the natural gas sample B in the comparative example;
FIG. 6 is a spectrum diagram of the result of the natural gas sample C detected by the stable isotope ratio mass spectrometer in the comparative example with the ratio as the ordinate;
FIG. 7 is a spectrum diagram of the result of the detection of the stable isotope ratio mass spectrometer with the ion intensity as the ordinate of the natural gas sample C in the comparative example;
FIG. 8 is a spectrum of the heavy component of the natural gas sample A detected by the stable isotope ratio mass spectrometer in example 2, with the ratio as the ordinate;
FIG. 9 is a spectrum of the heavy component of the natural gas sample A detected by the stable isotope ratio mass spectrometer in example 2, with the ion intensity as the ordinate;
FIG. 10 is a spectrum diagram of the heavy component of the natural gas sample B detected by the stable isotope ratio mass spectrometer in example 2, wherein the ratio is taken as the ordinate;
FIG. 11 is a spectrum of heavy component of natural gas sample B detected by the stable isotope ratio mass spectrometer in example 2 with ion intensity as ordinate;
FIG. 12 is a spectrum diagram of the heavy component of the natural gas sample C detected by the stable isotope ratio mass spectrometer in example 2, with the ratio as the ordinate;
fig. 13 is a spectrum of the heavy component of the natural gas sample C detected by the stable isotope ratio mass spectrometer in example 2, with the ion intensity as the ordinate.
In the figure: 1. a gas cylinder; 2. a displacement pump; 3. a temperature control device; 4. an intermediate container; 5. a flow meter; 6. a gas component detection device; 7. an air outlet valve; 8. a vacuum pump; 9. a pressure reducing valve; 10. an intake valve; 11. a liquid inlet valve; 12. a three-way pipe; 13. a vacuum valve; 14. a buffer device.
Detailed Description
Example 1:
as shown in fig. 1:
the invention provides a device for measuring trace carbon isotopes and heavy components in natural gas, which comprises a gas cylinder 1, an intermediate container 4, a buffer device 14, a flow meter 5 for measuring gas flow and a gas component detection device 6 which are sequentially connected through pipelines; wherein,
the outer side of the intermediate container 4 is provided with a temperature control device 3 for regulating and controlling the temperature of the intermediate container 4;
the intermediate container 4 is connected with a pressure control device for maintaining the internal pressure constant;
the intermediate container 4 and the buffer device 14 are both connected with a vacuum pump 8.
According to the device for measuring the trace carbon isotopes and the heavy components in the natural gas, when the trace carbon isotopes and the heavy components in the natural gas are measured, after the natural gas is injected into the intermediate container 4, the temperature of the natural gas is controlled by the temperature control device 3, the natural gas is condensed and separated by adopting a low-temperature condensation method, condensed gas and condensed liquid are obtained respectively, the obtained gas is called as the light components, the light component gas is detected by the gas component detection device 6, and the gas volume and the detection results of the gas component detection device 6 are recorded; heating and evaporating the condensate in the intermediate container 4 into gas by using the temperature control device 3 to control the temperature, wherein the obtained gas is called heavy component, detecting the heavy component gas by using the same gas component detection device 6, and recording the gas volume and the detection result of the gas component detection device 6; and then, calculating the total components of the natural gas according to a substance balance principle, wherein the measuring method provided by the invention does not directly test the components of the condensate, but evaporates the condensate into gas to test the components of the gas, so that the evaporation loss of the condensed liquid in the transfer process is avoided, the operation is simplified, and the trace carbon isotopes and heavy components in the natural gas can be more accurately measured.
As an optional implementation manner, the pressure control device comprises a pressure control pipeline, a displacement pump 2 and a liquid inlet valve 11, wherein the displacement pump 2 is connected to one end of the pressure control pipeline, and the other end of the pressure control pipeline is connected with the intermediate container 4; the liquid inlet valve 11 is connected to a pressure control pipeline.
As an optional embodiment, the temperature control range of the temperature control device 3 is-100 ℃ to 240 ℃.
As an alternative embodiment, the temperature control device 3 is a high-low temperature alternating test chamber or a cold-hot bath.
As an alternative embodiment, the gas cylinder 1 and the intermediate container 4 are communicated through an air inlet pipe, and a pressure reducing valve 9 and an air inlet valve 10 are sequentially arranged on the air inlet pipe along the air inlet direction.
As an alternative embodiment, the flow meter 5 is a turbine flow meter or a volumetric flow meter.
As an alternative embodiment, the gas component detection device 6 is a stable isotope ratio mass spectrometer and/or a gas chromatograph.
In the present embodiment, the gas component detection apparatus 6 is a stable isotope ratio mass spectrometer and a gas chromatograph; detecting a stable isotope ratio mass spectrometer and a gas chromatograph respectively during detection; when the stable isotope ratio mass spectrometer needs to be detected, the stable isotope ratio mass spectrometer is injected for detection; when the detection of the gas chromatograph is needed, the gas chromatograph is injected for detection.
As an alternative embodiment, the pipelines between the intermediate container 4 and the gas component detection device 6 are both heat-insulating pipelines; the purpose of providing a heat-insulated pipe is to minimize the change in gas due to a change in temperature before the gas discharged from the intermediate container 4 enters the gas component detection apparatus 6.
In the embodiment, a three-way pipe 12 is connected to the heat insulation pipeline between the intermediate container 4 and the buffer device 14, and the other end of the three-way pipe 12 is connected to the vacuum pump 8 through an air extraction pipeline; a vacuum valve 13 is arranged on the air exhaust pipeline; and an air outlet valve 7 is connected on the heat insulation pipeline between the buffer device 14 and the flowmeter 5.
Example 2:
the device for measuring the trace carbon isotopes and the heavy components in the natural gas in the embodiment 1 is used for measuring the trace carbon isotopes and the heavy components in the natural gas sample A, and comprises the following steps:
s1: vacuumizing, opening a vacuum valve 13, and vacuumizing the intermediate container 4 and the buffer device 14 by using a vacuum pump 8; after vacuumizing, closing the vacuum valve 13 and taking down the vacuum pump 8;
s2: sample introduction and condensation are carried out, a temperature control device 3 is started, and the set temperature is-90 ℃; after the temperature is stable, opening a pressure reducing valve 9, an air inlet valve 10 and a liquid inlet valve 11, enabling a natural gas sample A in the gas cylinder 1 to enter the intermediate container 4 through the air inlet pipe, and simultaneously maintaining the pressure of the intermediate container 4 to be constant by using the displacement pump 2 to separate the light component and the heavy component in the natural gas sample A into gas and liquid;
s3: analyzing the light component gas component, opening the gas outlet valve 7, using the displacement pump 2 to pressurize the pump, discharging the gas in the middle container 4, detecting the gas in the gas component detecting device 6 (stable isotope ratio mass spectrometer and gas chromatograph), recording the reading of the flow meter 5
And the detection result of the gas component detection means 6; the detection of the stable isotope ratio mass spectrometer and the gas chromatograph is carried out separately;
s4: analyzing the gas component of heavy component, setting the temperature of a temperature control device 3 at 200 ℃, after the temperature is stable, using a displacement pump 2 to perform constant pressure pump feeding, discharging the gas in an intermediate container 4, introducing the gas into a gas component detection device 6 (a stable isotope ratio mass spectrometer and a gas chromatograph) for detection, and recording the reading of a flow meter 5
And the detection result of the gas component detection means 6; the detection of the stable isotope ratio mass spectrometer and the gas chromatograph is carried out separately;
s5: and (3) calculating the total composition of the sample gas, namely calculating the total composition of the natural gas sample A according to the substance balance principle by using the results obtained in the steps S3 and S4, wherein the specific calculation steps are as follows:
(ii) calculating the densities of the light component gas and the heavy component gas by the following equation (1)
In formula (1):
-the pressure in the laboratory and the pressure in the laboratory,
；
② calculating the mass of the light component gas and the heavy component gas by the following formula (2)
In formula (2):
the volumes of the light component gas and the heavy component gas recorded by the flow meter 5 in the steps S3 and S4 are respectively recorded as
And
，
；
(iii) calculating the molecular weights of the light component gas and the heavy component gas according to the following formula (3)
In formula (3):
light component gas, heavy component gas
Are respectively recorded as
And
，%；
calculating the mole number of the light component gas and the heavy component gas according to the following formula (4)
In formula (4):
the number of moles of light component gas and heavy component gas, respectively
And
，
；
fifthly, calculating the total composition of the natural gas sample A according to the following formula (5)
In formula (5):
in-Natural gas sample A
Mole fraction of components,%;
The results of measuring trace carbon isotopes and heavy components of natural gas sample a are shown in table 1 below, fig. 8, and fig. 9.
The trace carbon isotopes and the heavy components were measured for the natural gas sample B and the natural gas sample C, respectively, in the same manner as in example 2, and the results are shown in table 1, fig. 10, fig. 11, fig. 12, and fig. 13 below.
Comparative example:
1. the results of analyzing the natural gas sample a, the natural gas sample B, and the natural gas sample C by injecting the natural gas sample a, the natural gas sample B, and the natural gas sample C directly into the same stable isotope ratio mass spectrometer used in example 2 are shown in table 1 and fig. 2 to 7.
Table 1 comparison of trace carbon isotope measurement results of example 2 and comparative example
As can be seen from table 1, the results of the natural gas carbon isotope test of the measurement methods of the examples and comparative examples are comparatively exemplified. The direct gas sample injection and gas sample condensation separation liquid evaporation gas injection stable isotope ratio mass spectrometer test results are shown in table 1, and the comparison tests show the isotopes of 3 gas samples: for the natural gas sample A and the natural gas sample B, only carbon isotopes in methane can be measured by adopting a direct sample introduction method in a comparative example, and the carbon isotopes in methane and ethane can be measured by adopting the method in the invention; for the natural gas sample C, only carbon isotopes in methane and ethane can be measured by the direct injection method in the comparative example, and carbon isotopes in methane, ethane and propane can be measured by the method in the invention. Therefore, the direct sampling method can not detect the isotopes of the trace components, and the method can be used for measuring the isotopes of the trace components.
Claims (10)
1. A device for measuring trace carbon isotopes and heavy components in natural gas is characterized by comprising a gas cylinder (1), an intermediate container (4), a buffer device (14), a flow meter (5) for measuring gas flow and a gas component detection device (6) which are sequentially connected through a pipeline; wherein,
a temperature control device (3) for regulating and controlling the temperature of the intermediate container (4) is arranged on the outer side of the intermediate container (4);
the intermediate container (4) is connected with a pressure control device for maintaining the internal pressure constant;
the intermediate container (4) and the buffer device (14) are both connected with a vacuum pump (8);
the device for measuring the trace carbon isotopes and the heavy components in the natural gas is used for measuring the trace carbon isotopes and the heavy components in the natural gas, and comprises the following steps:
s1: vacuumizing, wherein a vacuum pump (8) is used for vacuumizing the intermediate container (4) and the buffer device (14);
s2: sample introduction and condensation are carried out, a temperature control device (3) is started, and the set temperature is-89.5 to-95 ℃; after the temperature is stable, the natural gas sample in the gas cylinder (1) enters the intermediate container (4) through a pipeline, meanwhile, the pressure of the intermediate container (4) is kept constant at normal pressure by using a pressure control device, so that the light component and the heavy component in the natural gas sample are subjected to gas-liquid separation, and the natural gas sample is stopped being injected into the intermediate container (4) when condensate in the intermediate container (4) reaches 8-12 ml;
s3: analyzing the light component gas component, namely, using a displacement pump (2) to feed the gas into the pump at constant pressure, discharging the gas in the intermediate container (4), feeding the gas into a gas component detection device (6) for detection, and recording the reading of the flowmeter (5) and the result of the gas component detection device (6);
s4: analyzing the components of heavy component gas, setting the temperature of a temperature control device (3) to be 198-210 ℃, after the temperature is stable, feeding the gas into a pump by using a displacement pump (2) at a constant pressure, discharging the gas in an intermediate container (4), detecting the gas in a gas component detection device (6), and recording the reading of a flowmeter (5) and the result of the gas component detection device (6);
s5: and (4) calculating the total composition of the sample gas by using the results obtained in the step S3 and the step S4.
2. The device for measuring the trace carbon isotopes and the heavy components in the natural gas as claimed in claim 1, wherein the pressure control device comprises a pressure control pipeline, a displacement pump (2) and a liquid inlet valve (11), the displacement pump (2) is connected to one end of the pressure control pipeline, and the other end of the pressure control pipeline is connected with the intermediate container (4); the liquid inlet valve (11) is connected to the pressure control pipeline.
3. The device for measuring the trace carbon isotopes and heavy components in the natural gas as claimed in claim 1, wherein the temperature control range of the temperature control device (3) is-100 ℃ to 240 ℃.
4. The device for measuring the trace carbon isotopes and heavy components in natural gas as claimed in claim 1, wherein the temperature control device (3) is a high-low temperature alternating test chamber or a cold-hot bath.
5. The device for measuring the trace carbon isotopes and heavy components in the natural gas as claimed in claim 1, wherein the gas cylinder (1) is communicated with the intermediate container (4) through a gas inlet pipe, and a pressure reducing valve (9) and a gas inlet valve (10) are sequentially arranged on the gas inlet pipe along the gas inlet direction.
6. The apparatus for measuring trace carbon isotopes and heavy components in natural gas according to claim 1, characterized in that the flowmeter (5) is a turbine flowmeter (5) or a volumetric flowmeter (5).
7. The apparatus for measuring trace carbon isotopes and heavy components in natural gas according to claim 1, wherein the gas component detection apparatus (6) is a stable isotope ratio mass spectrometer and/or a gas chromatograph.
8. The device for measuring trace carbon isotopes and heavy components in natural gas according to any one of claims 1 to 7, wherein the pipelines between the intermediate container (4) and the gas component detection device (6) are insulated pipelines.
9. A method for measuring trace carbon isotopes and heavy components in natural gas, which applies the device for measuring trace carbon isotopes and heavy components in natural gas as claimed in any one of claims 1-8, and is characterized by comprising the following steps:
s1: vacuumizing, wherein a vacuum pump (8) is used for vacuumizing the intermediate container (4) and the buffer device (14);
s2: sample introduction and condensation are carried out, a temperature control device (3) is started, and the set temperature is-89.5 to-95 ℃; after the temperature is stable, the natural gas sample in the gas cylinder (1) enters the intermediate container (4) through a pipeline, meanwhile, the pressure of the intermediate container (4) is kept constant at normal pressure by using a pressure control device, so that the light component and the heavy component in the natural gas sample are subjected to gas-liquid separation, and the natural gas sample is stopped being injected into the intermediate container (4) when condensate in the intermediate container (4) reaches 8-12 ml;
s3: analyzing the light component gas component, namely, using a displacement pump (2) to feed the gas into the pump at constant pressure, discharging the gas in the intermediate container (4), feeding the gas into a gas component detection device (6) for detection, and recording the reading of the flowmeter (5) and the result of the gas component detection device (6);
s4: analyzing the components of heavy component gas, setting the temperature of a temperature control device (3) to be 198-210 ℃, after the temperature is stable, feeding the gas into a pump by using a displacement pump (2) at a constant pressure, discharging the gas in an intermediate container (4), detecting the gas in a gas component detection device (6), and recording the reading of a flowmeter (5) and the result of the gas component detection device (6);
s5: and (4) calculating the total composition of the sample gas by using the results obtained in the step S3 and the step S4.
10. The method for measuring trace carbon isotopes and heavy components in natural gas as claimed in claim 9, wherein in the step S5, the total composition of the natural gas sample is calculated by the following steps:
(ii) calculating the densities of the light component gas and the heavy component gas by the following equation (1)
② calculating the mass of the light component gas and the heavy component gas by the following formula (2)
(iii) calculating the molecular weights of the light component gas and the heavy component gas according to the following formula (3)
Calculating the mole number of the light component gas and the heavy component gas according to the following formula (4)
Fifthly, calculating the total composition of the natural gas sample according to the following formula (5)
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| CN116296671B (en) * | 2023-03-10 | 2023-10-17 | 中国科学院西北生态环境资源研究院 | Buffer piece matched with rare gas isotope analysis device in natural gas and method |
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