CN212674848U - Online circulation system and component analysis equipment for collecting light hydrocarbons in natural gas in laboratory - Google Patents
Online circulation system and component analysis equipment for collecting light hydrocarbons in natural gas in laboratory Download PDFInfo
- Publication number
- CN212674848U CN212674848U CN202021228844.9U CN202021228844U CN212674848U CN 212674848 U CN212674848 U CN 212674848U CN 202021228844 U CN202021228844 U CN 202021228844U CN 212674848 U CN212674848 U CN 212674848U
- Authority
- CN
- China
- Prior art keywords
- light hydrocarbon
- natural gas
- unit
- circulation system
- adsorption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 109
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 109
- 239000003345 natural gas Substances 0.000 title claims abstract description 75
- 238000004458 analytical method Methods 0.000 title abstract description 17
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 97
- 238000001179 sorption measurement Methods 0.000 claims abstract description 57
- 239000002808 molecular sieve Substances 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 41
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 19
- 238000012360 testing method Methods 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 238000003795 desorption Methods 0.000 description 14
- AFABGHUZZDYHJO-UHFFFAOYSA-N dimethyl butane Natural products CCCC(C)C AFABGHUZZDYHJO-UHFFFAOYSA-N 0.000 description 12
- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 12
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 10
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 8
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 8
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 8
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- ZFFMLCVRJBZUDZ-UHFFFAOYSA-N 2,3-dimethylbutane Chemical compound CC(C)C(C)C ZFFMLCVRJBZUDZ-UHFFFAOYSA-N 0.000 description 6
- PFEOZHBOMNWTJB-UHFFFAOYSA-N 3-methylpentane Chemical compound CCC(C)CC PFEOZHBOMNWTJB-UHFFFAOYSA-N 0.000 description 6
- RGSFGYAAUTVSQA-UHFFFAOYSA-N Cyclopentane Chemical compound C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 6
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methylcyclopentane Chemical compound CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000001282 iso-butane Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004817 gas chromatography Methods 0.000 description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 4
- 239000001294 propane Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- DMEGYFMYUHOHGS-UHFFFAOYSA-N heptamethylene Natural products C1CCCCCC1 DMEGYFMYUHOHGS-UHFFFAOYSA-N 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- HNRMPXKDFBEGFZ-UHFFFAOYSA-N 2,2-dimethylbutane Chemical compound CCC(C)(C)C HNRMPXKDFBEGFZ-UHFFFAOYSA-N 0.000 description 2
- -1 2-dimethylbutane Natural products 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000002470 solid-phase micro-extraction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000012468 concentrated sample Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000023077 detection of light stimulus Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The utility model provides an online circulation system and component analysis equipment for collecting light hydrocarbon in natural gas in a laboratory, which relate to the field of gas geochemistry analysis and a natural gas storage unit; a light hydrocarbon adsorption unit with a molecular sieve inside; a light hydrocarbon collection unit; the circulating power unit is arranged between the adsorption unit and the storage unit; and the natural gas storage unit, the circulating power unit, the light hydrocarbon adsorption unit and the light hydrocarbon sampling unit are sequentially connected in series to formA vacuum pipeline of a circulation system, the utility model discloses a structure has
Recycle systems for molecular sieves, i.e. obtaining pure C from natural gas with very low light hydrocarbon content5‑C8The method is simple, low in cost, simple and convenient to operate and high in obtaining efficiency.
Description
Technical Field
The utility model relates to a gaseous geochemistry analysis field especially relates to an enrichment system and component analysis equipment of lighter hydrocarbons in natural gas.
Background
Light hydrocarbon (C)5-C8) The natural gas is one of the important components of natural gas, contains extremely important and abundant geochemical information, and light hydrocarbon geochemical indexes can be used for determining the maturity of the natural gas, identifying the gas reservoir which is subjected to water washing or biodegradation, tracing the source of the natural gas and dividing the cause type of the natural gas.
The crude oil sample contains a large amount of volatile light hydrocarbon components, so that the light hydrocarbon components can be analyzed by using gas chromatography or high performance liquid chromatography; however, the content of light hydrocarbon components in natural gas is very low, particularly the content of methane in dry gas reaches more than 95%, and other hydrocarbon components are very little, so that during gas chromatography detection, only a few components such as methane, ethane and the like, namely light hydrocarbon components (C)5-C8) The content cannot be detected because it does not reach the chromatographic detection limit. Due to the limitation of analysis technology, the scientific research on light hydrocarbon components in natural gas is slow and inferior to the research work on light hydrocarbon in crude oil and hydrocarbon source rocks, and the gas-oil-source comparison work in geological science is hindered. Therefore, how to accurately and conveniently analyze the trace light hydrocarbon in the natural gas by using the gas chromatograph is a focus of the analysis and test technology.
Detecting light hydrocarbon components in the natural gas, and firstly carrying out enrichment pretreatment on the light hydrocarbon in the natural gas. The existing gas elution method, thermal evaporation method, rock sealing extraction, rock low boiling point light hydrocarbon extraction method and adsorption-acidolysis hydrocarbon analysis method are only suitable for crude oil and hydrocarbon source rock samples with higher light hydrocarbon content, and the slow curtain (1990) is set upThe meter pressure sampling method is only suitable for analyzing the natural gas with high humidity, and the natural gas steel cylinder needs to be heated to 120 ℃, so that great potential safety hazards exist; the quartz tube enrichment method disclosed by Zhang Hei et al (1994) has limited gas volume of the collected natural gas, and the six-way valve part is easy to generate errors, and light hydrocarbon components cannot be accurately detected. In recent years, studies have been conducted on the analysis of light hydrocarbons in natural gas by using Solid Phase Microextraction (SPME) technology (Li et)
) However, the method is not mature, and the detection of light hydrocarbon components in natural gas cannot be realized at present. Wangshun jade and the like disclose a natural gas C3-C8A new method for the analysis of hydrocarbon concentrates, which makes C for the direct collection of a concentrated sample of natural gas at an onsite wellhead3-C8In the hydrocarbon concentrator, however, it is necessary to perform a treatment such as elution of an impurity gas such as methane or ethane in the concentrator during the detection.
SUMMERY OF THE UTILITY MODEL
In order to realize the high efficiency, simple, convenient, safe, accurate analysis and test of the trace light hydrocarbon component in the natural gas sample, provide more reliable experimental data for the geochemistry research, carry out the scientific research of light hydrocarbon component light hydrocarbon geochemistry index in the natural gas to promote going on of gas-oil-source ratio work in the geological science, the utility model discloses a set of device and method that use molecular sieve to carry out circulation enrichment to the natural gas of fixed volume are established to can gather the light hydrocarbon component of having enriched on line, shift to gas chromatography and carry out the analysis. The device and the method can simply, conveniently, safely, accurately and efficiently enrich trace light hydrocarbon components in the natural gas.
For realizing the technical purpose of the utility model, an aspect of the utility model provides an online circulation system of natural gas light hydrocarbon is collected in laboratory, include:
a natural gas storage unit;
a light hydrocarbon adsorption unit with a molecular sieve inside;
a light hydrocarbon collection unit;
the circulating power unit is arranged between the adsorption unit and the storage unit; and
and the natural gas storage unit, the circulating power unit, the light hydrocarbon adsorption unit and the light hydrocarbon sampling unit are sequentially connected in series to form a vacuum pipeline of a circulating system.
The vacuum pipeline is provided with an air pump, a vacuum pump and a plurality of valves for controlling air flow.
The natural gas storage unit is any commercially available high-pressure steel cylinder with straight-through valves at two ends.
The light hydrocarbon adsorption unit is a stainless steel pipe with a molecular sieve inside, the pipeline is a U-shaped pipe, and the stainless steel pipe can increase the contact area of natural gas and the molecular sieve and enable gas to flow.
In particular, the molecular sieve used in the light hydrocarbon adsorption unit is
And (3) a molecular sieve.
The utility model only utilizes
The molecular sieve can absorb light hydrocarbon in natural gas, and has the advantages of single material, low cost and simple and convenient use.
Wherein, light hydrocarbon adopts the unit to include:
the heating devices are arranged at the periphery of the light hydrocarbon adsorption unit;
and the gas taking port is arranged on the adjacent pipeline of the light hydrocarbon adsorption unit.
The heating device is any commercially available high-temperature furnace which can be arranged on a stainless steel pipe, and can have a temperature control function and an intelligent adjusting function.
The utility model discloses an open heating device and can resolve out the light hydrocarbon that adsorbs in the adsorption unit, the method is simple.
Wherein, get gas port department and use the silica gel pad to seal.
When needs carry out the ration sample to light hydrocarbon, can utilize current ration sampling equipment to insert the rubber pad and extract, also can utilize external derivation equipment, derive the light hydrocarbon ration in the circulation system.
In particular, the light hydrocarbon collection unit may be connected to the detection system via existing quantitative sampling equipment.
Wherein, the detecting system is a gas chromatograph or other analytical equipment for analyzing light hydrocarbon.
For realizing the technical purpose of the utility model, the utility model discloses still provide a chemical composition analytical equipment of light hydrocarbon in natural gas, it has the online circulation system of foretell laboratory collection natural gas light hydrocarbon.
Advantageous effects
The utility model discloses a found to have
Recycle systems for molecular sieves, i.e. obtaining pure C from natural gas with very low light hydrocarbon content5-C8The light hydrocarbon gas is used for geochemical experimental analysis, and has the advantages of simple method, low cost, simple and convenient operation, high acquisition efficiency and stable test result.
Drawings
Fig. 1 is a schematic structural diagram of an on-line circulation collection system for light hydrocarbons in natural gas provided in embodiment 1 of the present invention;
FIG. 2 is a line graph showing the relationship between the adsorption component of the molecular sieve and time in the circulation system provided in test example 1 of the present invention;
fig. 3 is a line graph showing the relationship between the adsorption amounts of the molecular sieve to methane, ethane, isobutane and isopentane with time in the circulation system provided in the test example 1 of the present invention;
fig. 4 is a graph showing the relationship between the release amount of each component and the desorption temperature when the adsorption time is 30min in the circulation system provided in the test example 2 of the present invention;
fig. 5 is a graph showing the change of the gas component content desorbed at eight desorption temperatures when the adsorption time is 30min in the circulation system provided in the experimental example 2 of the present invention, wherein 1 is methane; 2. ethane; 3. propane; 4; isobutane; 5. n-butane; 6. isopentane; 7. n-pentane; 8. 2, 2-dimethylbutane; 9. cyclopentane +2, 3-dimethylbutane; 10. 2-methylpentane; 11. 3-methylpentane; 12. n-hexane; 13. methylcyclopentane.
In fig. 1, a natural gas storage unit, 11, a high-pressure steel cylinder, 12 and a connecting piece; 2. light hydrocarbon adsorption unit, 21, molecular sieve; 3. a light hydrocarbon collecting unit 31, a heating device 32, an air intake 321, a connecting piece 322 and a silica gel pad; 4. a circulating power unit; 5. vacuum pipeline, 51, vacuum gauge, 52, vacuum pump, 53, valve, 54, valve, 55, valve.
Detailed Description
The present invention will be further described with reference to specific examples and test examples. It should be understood that these examples and test examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
The present invention will be described below with reference to specific examples and test examples, which are merely illustrative and should not be construed as limiting the present invention. The technical means used in the examples and test examples are conventional means well known to those skilled in the art and the reagents and products used are commercially available, unless otherwise specified. Various procedures and methods not described in detail are conventional methods well known in the art, and the sources, trade names, and components of the reagents used are indicated at the time of first appearance, and the same reagents used thereafter are the same as those indicated at the first appearance, unless otherwise specified.
As shown in fig. 1, the utility model provides an online circulation collection system of light hydrocarbon in natural gas includes: a natural gas storage unit 1; a light hydrocarbon adsorption unit 2; a light hydrocarbon collecting unit 3; a circulating power unit 4; a vacuum line 5 with a valve 51 and a vacuum pump 52.
Further, the natural gas storage unit 1 includes a high pressure steel cylinder 11 storing natural gas and a connection 12 connecting the high pressure steel cylinder 11 to a vacuum line.
Specifically, the high-pressure steel cylinder 11 for storing natural gas is a high-pressure steel cylinder conventionally used in the art, and has a straight-through valve 13 at both ends thereof, such as an LPG stainless steel sampling steel cylinder sold by electromechanical technologies ltd of Jiangsu Wheatstone.
Specifically, the connecting member 12 is a commercially available stainless steel sealing joint capable of connection.
Further, the light hydrocarbon adsorption unit 2 is a U-shaped pipe, and a molecular sieve 21 is installed inside the U-shaped pipe.
In particular, the molecular sieve is commercially available
And (3) a molecular sieve.
Further, the light hydrocarbon collecting unit 3 comprises heating devices 31 arranged around the light hydrocarbon adsorption unit; and an air intake 32 disposed on the adjacent pipeline of the light hydrocarbon adsorption unit.
In particular, the gas extraction port 32 is connected to the circulation system via a connection 321.
Specifically, the air intake port 32 may be closed by a silicone pad 322.
Specifically, the heating device 31 may be any commercially available device capable of heating the U-shaped pipe, for example, a high temperature furnace, or any commercially available high temperature furnace capable of temperature control, and the connector 321 may be any commercially available stainless steel sealing joint capable of connection.
Further, the circulating power unit 4 is a commercially available micro air pump. The utility model discloses utilize the pressure differential that miniature air pump both ends produced, make the air current in the system take place directional circulation flow.
Further, the vacuum pipeline 5 connects the natural gas storage unit 1, the circulating power unit 4, the light hydrocarbon adsorption unit 2 and the light hydrocarbon sampling unit 3 in series in sequence to form a circulating system, and the circulating power unit 4 is utilized to enable the natural gas to flow in the natural gas storage unit 1 and the light hydrocarbon adsorption unit 2 in a circulating mode along one direction.
Specifically, the vacuum pipeline 5 is provided with a vacuum gauge 51, a vacuum pump 52, a valve 53 sequentially arranged between the circulating power unit 4 and the light hydrocarbon adsorption unit 2, and a valve 54 and a valve 55 on the pipeline between the gas intake port 32 and the natural gas storage unit 1.
Specifically, the vacuum gauge 51 is used to indicate the vacuum degree in the circulation system, the vacuum pump 52 is used to establish the vacuum environment in the circulation system, and also to discharge the impurity gas, the valve 55 is used to control the opening and closing of the vacuum pump, and the valve 53 and the valve 54 are used to open and close the gas flow at both ends of the light hydrocarbon adsorption unit 2.
Specifically, the utility model discloses used vacuum line is the stainless steel pipe of market, in the utility model discloses an embodiment, adopts Swagelok's 1/4 inches's stainless steel pipe as vacuum line.
The utility model adopts the above structure simple, low cost, especially the adsorption carrier in the light hydrocarbon adsorption unit 2 only needs
The molecular sieve has the advantages of single component, convenient replacement and low cost.
Example 2 on-line circulation collection method of light hydrocarbon in natural gas
The method for collecting light hydrocarbon in natural gas by using the system provided by the embodiment 1 comprises the following steps:
1. mounting connection for natural gas storage device
Firstly, the high-pressure steel cylinder 11 for collecting natural gas is connected into the circulating adsorption system by using the connecting piece 12 according to the structural connection relationship provided in the embodiment 1, and the through valves 13 at two ends of the high-pressure steel cylinder are in a closed state.
2. Test for gas tightness
And (3) closing the gas taking port, carrying out leak detection on the circulating adsorption system connected with the high-pressure steel cylinder 11, checking whether the gas tightness of each part of the system is good, adopting a conventional method in the field for the leak detection method, observing whether the vacuum gauge changes by closing the valve 55, judging that the gas tightness of the circulating system is good if the reading of the vacuum gauge does not change greatly, and indicating that the gas tightness of the system is poor if the reading of the vacuum gauge is increased.
3. Building a vacuum circulation System
The vacuum pump 52 is turned on and the line valve 53 and valves 54, 55 are opened, as the vacuum gauge is shown
At this point, valve 55 is closed, and the system is purged of air. Then the straight-through valves 13 at the two ends of the high-pressure steel cylinder are slowly opened, and the micro air pump 4 is simultaneously opened, so that the natural gas in the system generates directional circulating flow due to the pressure difference generated at the two ends of the air pump.
4. Adsorption of light hydrocarbons in natural gas
The natural gas flows out from one end of the high-pressure steel cylinder 11 and flows through the U-shaped pipe 2 along the vacuum pipeline 5 due to the action of the micro air pump 4
A molecular sieve is used for the molecular sieve,
the molecular sieve absorbs light hydrocarbon in the natural gas, the residual natural gas returns to the high-pressure steel cylinder 11, and when the natural gas continuously flows out of the high-pressure steel cylinder, passes through the U-shaped pipe 2 and then continuously flows into the high-pressure steel cylinder 11, the natural gas and the natural gas are enabled to be mixed
The molecular sieve is contacted repeatedly, and light hydrocarbon in the natural gas is continuously in
And (4) enriching in the molecular sieve.
5. Extraction of light hydrocarbons from natural gas
After the light hydrocarbon adsorption is completed, the valve 55 is opened, and the vacuum pump 52 is started to discharge the impurity gas. Then, the valve 53 and the valve 54 are closed, the heating device 31 is opened to heat the U-shaped tube, so that the light hydrocarbon components adsorbed by the molecular sieve are desorbed, after a period of heating, the light hydrocarbon gas is taken from the gas taking port by using the existing quantitative sampling equipment, for example, an external device with a fixed volume of saturated saline water is connected with the gas taking port, and the light hydrocarbon is quantitatively taken. Because the utility model discloses the light hydrocarbon purity that the method was taken is high, consequently can directly be used for gas chromatography to detect from the light hydrocarbon of gas port collection to carry out gaseous geochemistry analysis.
Application examples
A high-pressure steel cylinder having a capacity of 1L was connected to the circulation system of example 1, and 3g of the steel was charged in a U-shaped tube in the circulation system
Molecular sieves, light hydrocarbons were adsorbed and collected using the method provided in example 2.
Specifically, the adsorption time is 30-60min, the impurity gas discharge time is 30s, the heating temperature is less than 300 ℃, and the heating time is 2 min.
Detecting that the impurity gas is methane, ethane, propane, isobutane and normal butane; the gas collected from the gas extraction port is isopentane, n-pentane, 2-dimethylbutane, cyclopentane +2, 3-dimethylbutane, 2-methylpentane, 3-methylpentane, n-hexane, methylcyclopentane.
It is thus clear that utilize the utility model provides an online circulation collection system of light hydrocarbon in natural gas can be high-efficient accurate collect the light hydrocarbon gas in the natural gas that the content is minimum.
The following is the utility model discloses the part experiment of going on in the development process is specifically as follows:
test example 1 adsorption Effect test of Components at different adsorption times
In order to study in the circulatory system
Molecular sieve for natural gas light hydrocarbonThe adsorption behavior of the components is tested by selecting different adsorption time, which is respectively as follows: 5min, 10min, 30min, 60min, 150min and 300 min, wherein the desorption temperature of the sample is divided into eight temperature points of 150 ℃, 200 ℃, 250 ℃, 300 ℃, 350 ℃, 400 ℃, 450 ℃ and 500 ℃ from 150 ℃ to 500 ℃. The sample volume during chromatographic detection is all 0.5mL, so that in order to avoid various accidental errors caused by single sample introduction, the samples collected in each adsorption time period are tested repeatedly for multiple times (n is more than or equal to 5), and an average value is taken. After the molecular sieve passes through different adsorption time, the total amount of adsorbed light hydrocarbon is the sum of the gas amount analyzed at each temperature point. The experimental data are shown in table 1, fig. 2 and fig. 3.
TABLE 1 adsorption content of various components of molecular sieves at different adsorption times
Note: the amounts of the components are expressed as the area of the chromatographic peak (mV. s), and the data in the table is the sum of the amounts of gases desorbed from each component at six temperature points, 150 ℃, 200 ℃, 250 ℃, 300 ℃, 350 ℃, 400 ℃, 450 ℃ and 500 ℃.
From the results in Table 1 and FIG. 1, it can be seen that the molecular sieves adsorbed propane, n-butane, n-pentane, 2-dimethylbutane, cyclopentane +2, 3-dimethylbutane, 2-methylpentane, 3-methylpentane, n-hexane, and methylcyclopentane for 60 min. Before increasing with time, reaching a maximum between 30 and 60min, and after that decreasing with increasing adsorption time. Indicating that the molecular sieve has a unimodal distribution of the adsorption of these components over time. Although the adsorption amount of the molecular sieve to methane, ethane, isobutane and isopentane fluctuates greatly with time as shown in fig. 2, the trend of the total adsorption amount of the molecular sieve is still maximum between 30min and 60min within the same adsorption time. After 60min, the adsorption capacity begins to decrease, and it can be seen that the molecular sieve starts to diffuse after the adsorption reaches the equilibrium.
It can also be seen from FIG. 2 that the adsorption of methane is minimal at 30min and that the adsorption of the other components is substantially maximal at 30 min. Thus setting the adsorption timeThe main Component (CH) in natural gas can be effectively filtered out after the concentration is 30min4) Thereby achieving the purpose of light hydrocarbon concentration.
Through the analysis, the optimal adsorption time of 30min can be obtained.
Test example 2 contents of respective components released at different desorption temperatures
According to the results of the experimental analysis of test example 1, the applicant desorbed hydrocarbons from the molecular sieve at eight temperature points of 150 ℃, 200 ℃, 250 ℃, 300 ℃, 350 ℃, 400 ℃, 450 ℃ and 500 ℃ respectively, with the temperature error controlled within + -10 ℃. The composition data thus obtained are shown in Table 2 and FIG. 4.
TABLE 2 content of components released at different desorption temperatures
Note: the data in the table are the peak areas (mV. s) of the chromatogram for each component
It can be seen from table 2 and fig. 4 that the total amount of gas released is maximum when the desorption temperature is 300 deg.c. The amount of gas released before 300 ℃ gradually increases; after the desorption temperature exceeds 300 ℃, the amount of desorbed gas is reduced sharply. Indicating that most of light hydrocarbon components absorbed by the molecular sieve can be released at 300 ℃.
According to the change curve of the release amount of each component in the molecular sieve with the desorption temperature shown in fig. 5, the desorption amounts of components such as methane, ethane, isopentane, 2-dimethylbutane and the like are reduced with the increase of the desorption temperature, and isobutane is basically and completely released before 300 ℃. Indicating that these components can be released from the molecular sieve at a lower desorption temperature. The desorption amount of components such as propane, n-butane, n-pentane and n-hexane reaches the maximum at 300 ℃. The methane content in the adsorbed gas is obviously reduced, which shows that the 5A molecular sieve also has the functions of filtering methane and concentrating light hydrocarbon.
It can also be seen from FIG. 5 that methane and ethane are the lowest in the desorbed gases at 300 ℃ and 350 ℃, and that the components after isopentane are in the desorbed gas with increasing temperatureThe higher the carbon number of the component(s), the more pronounced the effect of the increased content with increasing temperature, since the thermodynamic properties of the higher carbon number hydrocarbon molecule determine its need for a higher desorption temperature to disengage from the molecular sieve. Sample after 5A molecular sieve adsorption and C compared to the original sample composition5 +The component concentration is obviously increased.
Test example 3
Reproducibility test of molecular sieve enrichment effect
The utility model discloses still tested in the circulation system in the test process
Reproducibility of the molecular sieve enrichment effect (the repetition number n is 7), and the conditions are selected as follows: the adsorption time is 30min, the desorption temperature is 300 ℃, the chromatographic detection conditions are unchanged, and the data are shown in table 3. The standard deviation of all light hydrocarbon components was less than 0.4.
TABLE 35A molecular Sieve enrichment repeat test
Column: the data in the table are the percentage concentration (%)
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides an online circulation system of natural gas light hydrocarbon is collected in laboratory which characterized in that includes:
a natural gas storage unit;
a light hydrocarbon adsorption unit with a molecular sieve inside;
a light hydrocarbon collection unit;
the circulating power unit is arranged between the adsorption unit and the storage unit; and
and the natural gas storage unit, the circulating power unit, the light hydrocarbon adsorption unit and the light hydrocarbon sampling unit are sequentially connected in series to form a vacuum pipeline of a circulating system.
2. The on-line circulation system for collecting light hydrocarbons in natural gas as claimed in claim 1, wherein the vacuum pipeline is provided with an air pump and a vacuum pump, and a valve for controlling air flow.
3. The on-line circulation system for collecting light hydrocarbons from natural gas as claimed in claim 1, wherein said light hydrocarbon extraction unit comprises:
the heating devices are arranged at the periphery of the light hydrocarbon adsorption unit;
and the gas taking port is arranged on the adjacent pipeline of the light hydrocarbon adsorption unit.
4. The on-line circulation system for collecting light hydrocarbons in natural gas as claimed in claim 1, wherein the light hydrocarbon collection unit is connected to the detection system via existing quantitative sampling equipment.
5. An apparatus for analyzing chemical composition of light hydrocarbon in natural gas, which is characterized in that it has an on-line circulation system for collecting light hydrocarbon in natural gas as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021228844.9U CN212674848U (en) | 2020-06-29 | 2020-06-29 | Online circulation system and component analysis equipment for collecting light hydrocarbons in natural gas in laboratory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021228844.9U CN212674848U (en) | 2020-06-29 | 2020-06-29 | Online circulation system and component analysis equipment for collecting light hydrocarbons in natural gas in laboratory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212674848U true CN212674848U (en) | 2021-03-09 |
Family
ID=74818321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021228844.9U Expired - Fee Related CN212674848U (en) | 2020-06-29 | 2020-06-29 | Online circulation system and component analysis equipment for collecting light hydrocarbons in natural gas in laboratory |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212674848U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088832A (en) * | 2021-11-12 | 2022-02-25 | 中国科学院西北生态环境资源研究院 | Deep-ultra-deep hydrocarbon source rock normal paraffin light component and isotope analysis system and method |
-
2020
- 2020-06-29 CN CN202021228844.9U patent/CN212674848U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088832A (en) * | 2021-11-12 | 2022-02-25 | 中国科学院西北生态环境资源研究院 | Deep-ultra-deep hydrocarbon source rock normal paraffin light component and isotope analysis system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105548416B (en) | Method for analyzing hydrogen isotopes of light hydrocarbon monomer hydrocarbon in natural gas and light hydrocarbon enrichment device | |
| CN101294936B (en) | Plant source volatile organic matter test method | |
| US10215737B2 (en) | Apparatus for and method of gas analysis | |
| CN103226139B (en) | Process for analyzing gas-phase total components in cigarette mainstream smoke through airbag-thermal desorption-gas chromatography/mass spectrometry method | |
| NL2028533B1 (en) | Method and online circulation system for collecting light hydrocarbon in natural gas | |
| CN109603413B (en) | Device and method for separating hydrogen and methane in mixed gas and measuring hydrogen isotopes | |
| CN206460004U (en) | A kind of Full-automatic gas analysis system | |
| CN104777261A (en) | Low temperature gas chromatography system, low temperature gas chromatography method and low temperature gas chromatography device of volatile organic compound in atmosphere | |
| CN113155988A (en) | Non-methane total hydrocarbon detection system and method based on single valve | |
| CN212674848U (en) | Online circulation system and component analysis equipment for collecting light hydrocarbons in natural gas in laboratory | |
| CN103048412A (en) | Online analysis pretreatment device for trace hydrogen isotopes in natural gas | |
| CN101275931B (en) | Method for detecting trace quantity SOX in hydrogen using adsorption concentration | |
| US3719084A (en) | Means for separating organics containing from one to twenty carbons comprising series connected packed and capillary columns | |
| Wang et al. | Influence of sampling methods and storage condition on volatile methyl siloxanes quantification in biogas | |
| CN205749410U (en) | A kind of gas chromatograph | |
| Doskey | The effect of treating air samples with magnesium perchlorate for water removal during analysis for non‐methane hydrocarbons | |
| CN208297430U (en) | A kind of secondary parsing thermal desorption device of binary channels | |
| JPH04278458A (en) | Method and apparatus for concentration analysis | |
| CN113791133A (en) | Direct measurement method and detection system for non-methane total hydrocarbons | |
| CN210347556U (en) | Extremely rare sample direct determination enrichment sampling system | |
| Ortman | Monitoring Methane in Atomosphere with a Flame Ionization Detector. | |
| CN113804769B (en) | Light hydrocarbon carbon isotope enrichment analytical equipment in natural gas | |
| Kazakova et al. | Pilot study of desorption kinetics of adsorbate from an adsorbent granule | |
| CN114814039B (en) | Method for analyzing content of impurities in fluorine gas | |
| CN210639133U (en) | Single cold hydrazine secondary thermal desorption equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210309 |