CN107976552B - Universal sample introduction device and universal sample introduction method for gaseous hydrocarbon and liquefied petroleum gas - Google Patents
Universal sample introduction device and universal sample introduction method for gaseous hydrocarbon and liquefied petroleum gas Download PDFInfo
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Abstract
The invention provides a general sample introduction device and a general sample introduction method for gaseous hydrocarbon and liquefied petroleum gas. The invention relates to a universal sample introduction device for gaseous hydrocarbon and liquefied petroleum gas, which comprises: the device comprises a sample injection port (1), a sample flow regulating valve (2), a sample vaporizing chamber (3), a gas pressure reducing valve (4), a channel conversion component (5), a gas quantitative ring (6), a carrier gas inlet (7), a carrier gas flowmeter (8), an exhaust outlet (9), a back pressure valve (10), an analyzer inlet (11) and a heating control module (12). The device and the method can realize accurate quantification of the sample, the back pressure valve added at the tail end of the quantification ring can ensure the stability and the accuracy of the pressure in the quantification ring, and meanwhile, the consistency of the sampling quantity of each time can be ensured by the temperature control of the quantification ring, the heat preservation of a pipeline and the passivation treatment. The device can realize accurate quantification of the sample by improving the system pressure so as to determine the sample difficult to detect or the trace sample.
Description
Technical Field
The invention relates to a sample injection device for a gaseous or liquid hydrocarbon sample, in particular to a sample injection device for gaseous hydrocarbon and liquefied petroleum gas.
Background
With the development of the petrochemical industry, the liquefied petroleum gas has been increasingly regarded as a chemical basic material and a new fuel. LPG refers to petroleum gas liquefied at high pressure or low temperature, and is referred to as "liquefied petroleum gas" or "liquefied gas" for short. The components of the catalyst are propane, n-butane, isobutane, a small amount of ethane, organic compounds with carbon number more than 5, unsaturated hydrocarbon and the like. LPG has the characteristics of flammability, explosiveness, gasification, thermal expansibility, corrosiveness and the like. LPG is typically obtained from oil and gas fields, refineries or ethylene plant petroleum gases. Compared with other fuels, LPG has the advantages of less pollution, high heat generation, easy transportation, simple storage, flexible supply and the like.
The measurement of the composition and the sulfur content of the liquefied petroleum gas is an important index for the liquefied petroleum gas, the liquefied petroleum gas is introduced into an analysis and detection instrument, the uniformity and the representativeness of the sample introduction of the liquefied petroleum gas must be ensured, the accurate quantification of the sample introduction of the liquefied petroleum gas is carried out, and the measurement of the composition and the sulfur content of the liquefied petroleum gas is an important precondition.
SH/T0230 liquefied petroleum gas composition determination method, ASTM D6667 liquefied petroleum gas sulfur content determination ultraviolet fluorescence method, SH/T0222 liquefied petroleum gas total sulfur content determination method. The above detection methods are all discussed in detail for the injection of liquefied petroleum gas. However, most refineries reflect the composition of the liquefied petroleum gas and the measurement result of the sulfur content of the liquefied petroleum gas greatly, the repeatability of the test is very poor, particularly, when the sulfur content is measured, data comparison is carried out, many units can be different by 50 percent or even one order of magnitude, an analyst has no confidence in the data of the analyst, and the repeatability and the reproducibility data are too poor. Through a large amount of investigation and data verification, the main problem of poor precision of the measurement of the composition, the sulfur content and the water content of the liquefied petroleum gas is the sample injection system: the problems of incomplete gasification, inaccurate quantification, recondensation after gasification, pipeline adsorption in the gasification process and other sample introduction problems of the liquefied petroleum gas are the main reasons of poor repeatability of the data result of the liquefied petroleum gas.
The SH/T0230 liquefied petroleum gas composition determination method and the SH/T0222 liquefied petroleum gas total sulfur content determination method realize the gasification of the liquefied petroleum gas through a water bath, the water bath hardly gasifies components with the boiling point higher than 100 ℃ stored in the liquefied petroleum gas, and the standard does not mention how to sample after gasification, most refineries use a sample injection needle for sample injection in actual operation, but if a needle cylinder is too tight, the actual sampling pressure of the gas is possibly larger than 1 atmosphere, so that the test result is larger, if the needle cylinder is too loose, the gas is leaked, and the test result is smaller. Meanwhile, the repeatability of sample injection is difficult to ensure.
In the ultraviolet fluorescence method for measuring the sulfur content of the liquefied petroleum gas in ASTM D6667, the liquefied petroleum gas in the standard is injected by using a liquid valve and gas valve sample injection system, and two sets of sample injection systems are arranged. According to literature reports, when gas is taken from a gas bag and stored, the sulfur content is attenuated by 20% within 2 hours, and the sulfur content is attenuated by nearly 50% within 4 hours, so that the data is difficult to guarantee to be real and effective by directly using a gas valve for sample injection. The liquid valve advances a kind, the ration will guarantee simultaneously that the liquid quantitative ring part that enters does not have the bubble, has designed the observation tube in the standard, avoids the bubble to cause the influence to the ration, but the actual operation is hardly accomplished, and the sample size of sample is not enough, and insufficient pressure bubble is difficult to be arranged totally, consequently advances a kind data repeatability poor, hardly accurate ration.
Aiming at various problems of the measurement of the sulfur content and the composition of liquefied petroleum gas in the market, the invention combines the advantages of liquid sample introduction and gas quantification, provides a sample introduction device and a sample introduction method which can fully gasify the liquefied petroleum gas and accurately quantify the liquefied petroleum gas, can realize the stable sample introduction of the liquefied petroleum gas and the gas sample, and solves the important difficult problems of poor measurement repeatability and reproducibility of the sulfur content and the composition of the liquefied petroleum gas and the gaseous hydrocarbon in the petrochemical industry, and the like.
Disclosure of Invention
The invention provides a general sample introduction device and a general sample introduction method for gaseous hydrocarbon and liquefied petroleum gas.
The invention relates to a universal sample introduction device for gaseous hydrocarbon and liquefied petroleum gas, which comprises: sample introduction port 1, sample flow control valve 2, sample vaporizer 3, gas relief valve 4, passageway converting part 5, gaseous ration ring 6, carrier gas entry 7, carrier gas flowmeter 8, exhaust outlet 9, back pressure valve 10, analysis appearance entry 11, heating control module 12, sample introduction port 1 links to each other in proper order with sample flow control valve 2, sample vaporizer 3, gas relief valve 4, passageway converting part 5, gaseous ration ring 6 links to each other with passageway converting part 5, carrier gas entry 7 links to each other in proper order with carrier gas flowmeter 8, passageway converting part 5, analysis appearance entry 11 links to each other with passageway converting part 5, passageway converting part 5 links to each other in proper order with back pressure valve 10, exhaust outlet 9, heating control module 12 is used for controlling the temperature of each part.
The channel conversion component 5 comprises a sample injection channel 51 and a measurement channel 52, wherein the sample injection channel 51 is connected with the quantitative ring 6, the back pressure valve 10 and the exhaust outlet 9 during sample injection; the measurement channel 52 is connected to the dosing ring 6 and the analyzer inlet 11 for sample measurement.
The sample injection port 1 is preferably provided with a filter to prevent impurities from blocking a pipeline;
the temperature of the sample vaporization chamber 3 is controlled by the heating control module 12, and the preferred temperature range is room temperature to 150 ℃;
the gas pressure reducing valve 4 can reduce the pressure of the gasified sample;
the channel switching component 5 is preferably a multi-way valve, for example, a six-way valve, an eight-way valve, a ten-way valve, a twelve-way valve or a fourteen-way valve can be selected, wherein the multi-way valve with more than ten ways can realize the switching of two or more quantitative rings with different volumes, so that different sample volumes can be selected.
The channel conversion component 5 and the gas quantitative ring 6 are preferably made of metal materials;
the inner surfaces of the channel switching part 5 and the gas dosing ring 6 are preferably provided with a sulfur passivation coating;
the channel conversion component 5 can be automatically controlled or manually controlled, and can realize the conversion between a sample feeding channel and a measuring channel;
the volume of the gas quantitative ring 6 is preferably 1-10 mL; the number of the gas quantifying rings 6 can be one or more;
the carrier gas inlet 7 is preferably provided with a filter to prevent impurities from blocking the pipeline;
the carrier gas flowmeter 8 can accurately control the flow of carrier gas;
the back pressure valve 10 can control the pressure in the dosing ring together with the gas pressure reducing valve 4. The gas pressure reducing valve 4 reduces the pressure of the gasified sample, and the pipeline pressure can be controlled by adjusting the back pressure valve 10, so that more accurate pressure control is realized.
The heating control module 12 can control the temperature of each component, and can control the temperature of the sample vaporizing chamber 3, the channel switching component 5, the gas quantifying ring 6 and the pipeline; the temperature range controlled for the channel switching member 5, the gas dosing ring 6 and the piping is preferably 40 ℃ to 80 ℃.
The preferred general sample introduction device for gaseous hydrocarbon and liquefied petroleum gas is based on the device, a filter is added between the sample introduction port 1 and the sample flow regulating valve 2, the material of the filter is preferably polytetrafluoroethylene or metal with passivated surface, and the function of the online filter is to prevent solid particles from entering the system to block a pipeline or a gasification chamber.
The most preferred universal sample introduction device for gaseous hydrocarbon and liquefied petroleum gas is based on the preferred device, a visible transparent tube is arranged between the sample flow regulating valve 2 and the sample gasification chamber 3, the visible transparent tube is helpful for observing a sample, the liquid sample entering the gasification chamber is ensured not to contain bubbles, and the repeatability and the accuracy of liquid sample introduction can be greatly improved.
The invention also provides a universal sample introduction method for gaseous hydrocarbon and liquefied petroleum gas by adopting the sample introduction device.
The invention relates to a general sample injection method of gaseous hydrocarbon and liquefied petroleum gas, which comprises the following steps: 1) setting a channel conversion component 5 as a sample introduction mode, introducing a sample from a sample introduction port 1, passing through a flow regulating valve 2, gasifying the sample through a gasification chamber 3, reducing the pressure through a gas pressure reducing valve 4, and introducing the sample into a quantitative ring 6 through a sample introduction channel 51 of the channel conversion component 5; 2) the channel switching part 5 is set to be in a measurement mode, the carrier gas introduced from the carrier gas inlet 7 enters the quantitative ring 6 through the carrier gas flowmeter 8 and the measurement channel 52 of the channel switching part 5, and the carrier gas and the sample in the quantitative ring 6 enter the analyzer inlet 11 together for measurement.
The test sample of the present method may be a gaseous hydrocarbon or a liquefied petroleum gas.
The device and the method can realize accurate quantification of the sample, the back pressure valve added at the tail end of the quantification ring can ensure the stability and the accuracy of the pressure in the quantification ring, and meanwhile, the consistency of the sampling quantity of each time can be ensured by the temperature control of the quantification ring, the heat preservation of a pipeline and the passivation treatment. The device can realize accurate quantification of the sample by improving the system pressure so as to determine the sample difficult to detect or the trace sample.
The device and the method can be suitable for sample injection of gas and liquid phase samples, can directly make a standard curve through a gas standard sample, avoid the problems of poor stability and uniformity and difficulty in preparation of the standard liquid when the liquid standard sample is used, and greatly improve the accuracy of a measurement result.
The device and the method realize different sample feeding amounts of the sample by controlling the pressure of the system and the quantitative ring, do not need to replace the quantitative ring, have accurate sample feeding, good repeatability and convenient use, and overcome the problems of inaccurate liquid quantification, incomplete gasification of the LPG sample, and easy adsorption of low-content sulfur by the sample feeding device, which cause no detection, difficult gasification of high-boiling-point sulfur, poor data repeatability of total sulfur and even no detection in the existing detection method and sample feeding device.
The universal sample introduction device can be connected with a sulfur content detector, a nitrogen content tester, a metal content tester, a trace water tester and the like, and can be used for detecting trace components in liquefied petroleum gas and gaseous hydrocarbon.
The device and the method of the invention have safe and simple operation, are easy to carry out full gasification and quantification on the LPG sample accurately, and have reliable results.
Drawings
Fig. 1 is a diagram of a universal sample injection device for gaseous hydrocarbon and liquefied petroleum gas according to the present invention.
Fig. 2 shows a universal sample injection device for gaseous hydrocarbon and liquefied petroleum gas according to the present invention, wherein the channel switching member 5 is a six-way valve.
Fig. 3 is a six-way valve in the sample injection device of fig. 2.
Fig. 4 is a general sample introduction device for gaseous hydrocarbon and liquefied petroleum gas according to the present invention, in which the channel switching member 5 is a ten-way valve.
Fig. 5 is a ten-way valve in the sample introduction device of fig. 3.
Detailed Description
The sample introduction device and method of the present invention are illustrated with reference to the apparatus of FIG. 1.
Setting a channel conversion component 5 as a sample introduction mode, introducing a sample from a sample introduction port 1, passing through a flow regulating valve 2, gasifying the sample through a gasification chamber 3, reducing the pressure through a gas pressure reducing valve 4, introducing the sample into a quantitative ring 6 through a sample introduction channel 51 of the channel conversion component 5, and discharging the residual sample through a back pressure valve 10 and an exhaust outlet 9; the channel switching part 5 is set to be in a measurement mode, the carrier gas introduced from the carrier gas inlet 7 enters the quantitative ring 6 through the carrier gas flowmeter 8 and the measurement channel 52 of the channel switching part 5, and the carrier gas purges the sample in the quantitative ring 6 and brings the sample into the analyzer for measurement.
The sample introduction device and method of the present invention are illustrated with reference to the devices and components of FIGS. 2 and 3.
The channel switching component 5 is a six-way valve, the sample inlet 1 is connected with 501 of the six-way valve through a flow regulating valve 2, a gasification chamber 3 and a gas pressure reducing valve 4, the quantitative ring 6 is connected with 503 and 506 of the six-way valve, the exhaust outlet 9 is connected with 502 of the six-way valve, the carrier gas inlet 7 is connected with 504 of the six-way valve, and the analyzer inlet 11 is connected with 505 of the six-way valve.
When the six-way valve is set to the sampling mode, as shown in fig. 3A, the connection state between the valves in the six-way valve is: 501 and 506, 504 and 505, and 502 and 503, wherein the channels 501 and 506 and the channels 6 and 503 and 502 of the six-way valve 5 form the sample inlet channel 51 of the six-way valve 5. A sample enters from the sample inlet 1, passes through the flow regulating valve 2, is gasified through the gasification chamber 3, is decompressed by the gas decompression valve 4, enters the quantitative ring 6 through the sample inlet channel 51 of the six-way valve 5, and is discharged through the exhaust outlet 9 after passing through the back pressure valve, so that the quantitative ring 6 is filled; when the six-way valve is set to the measurement mode, as shown in fig. 3B, the connection state between the respective valves in the six-way valve is: 501 to 502, 504 to 503, 505 and 506, the channel 504 and 503 of the six-way valve 5 and the quantitative rings 6 and 506 and 505 form the measuring channel 52 of the six-way valve 5. The carrier gas introduced from the carrier gas inlet 7 enters the quantitative ring 6 through the carrier gas flowmeter 8 and the measuring channel 52 of the six-way valve 5, the carrier gas and the sample in the quantitative ring 6 enter the analyzer inlet 11 together for measurement, and the volume of the sample entering the analyzer is the volume of the quantitative ring 6, so that the measurement operation of the sample can be realized, for example, the sulfur analyzer can be connected to measure the physical properties of the sample, such as sulfur content and the like.
The sample introduction device and method of the present invention are illustrated with reference to fig. 4 and 5.
The channel switching component 5 is a ten-way valve, and when the ten-way valve is set to be in a sample injection mode, as shown in fig. 5A, the connection state between each valve in the ten-way valve is as follows: 501 is connected with 502, 503 is connected with 504, 505 is connected with 506, 507 is connected with 508, 509 is connected with 510; when the ten-way valve is set to the measurement mode, as shown in fig. 5B, the connection state between the valves in the ten-way valve is: 501 is connected with 510, 502 is connected with 503, 504 and 505 are connected with 507, 506 is connected with 509;
when the channel switching component 5 is a ten-way valve, two quantitative rings may be provided, and a sample inlet and an exhaust outlet are separately provided for each quantitative ring, so that sample introduction operations may be performed on the two quantitative rings.
The first sample inlet 1a is connected with 509 of the ten-way valve, and the first quantitative ring 6a is connected with 507 and 510 of the ten-way valve; the second sample inlet 1b is connected with 503 of the ten-way valve, and the second quantitative ring 6b is connected with 502 and 505 of the ten-way valve; the common exhaust outlet 9 is connected to 508, 504 of the ten-way valve; the volumes of the first quantitative ring 6a and the second quantitative ring 6b may be set to be the same or different, and preferably, the volumes are set to be two kinds of quantitative rings with different volumes, i.e., one large volume and one small volume; carrier gas inlet 7 is connected to the ten-way valve 501 and analyzer inlet 11 is connected to the ten-way valve 506.
The program sets the ten-way valve as the sample injection mode (as shown in fig. 5A), the sample 1 enters the ten-way valve from 509, passes through 510, is connected to the first quantitative loop 6a, and then is connected to 507, 508 and the exhaust outlet 9, at this time, the 509-508 channel and the 507-508 channel of the ten-way valve constitute the first sample injection channel 51a, so as to realize the cleaning of the pipeline and the quantitative loop and the sample injection process of the quantitative loop 6 a. Then, the ten-way valve is switched to a measurement mode (as shown in fig. 5B) by a program setting, at this time, the carrier gas enters the valve 501 of the ten-way valve 5 after passing through the carrier gas inlet 7 and the flow regulating valve 8, enters the first quantitative ring 6a through 510, and enters the analyzer inlet 11 through 507 and 506 together with the sample in the quantitative ring, at this time, the 501-506 channel and the 6 a-507-506 channel of the ten-way valve constitute the measurement channel 52a, so that the measurement operation of the sample can be realized. At this time, the sample inlet 2 may be loaded with the sample 2 or may be in an idle state. If the sample inlet 2 is used for loading the sample 2, when in the state of fig. 5A, the sample 1 is in the sample loading position, and the sample 2 is in the measurement state under the action of the carrier gas, and when in the state of fig. 5B, the sample 1 is in the measurement state, and the sample 2 is in the sample loading state.
Example 1
The sulfur content of the liquefied petroleum gas sample is measured by the device shown in fig. 1, and the inlet 11 of the analyzer is connected with a sulfur content measuring instrument. The instrument power is switched on, the connection condition of the pipeline is checked, the temperature of the gasification chamber 3 is set to be 100 ℃, the set value of the temperature can be adjusted according to the type of the sample, the temperature of the quantitative ring 6 is set to be 80 ℃, and the set value is set according to the condition when the standard sample is measured. And after the temperature reaches a set value, performing system purging and quantitative ring 6 sample filling processes, wherein the volume of the quantitative ring is 3 mL. Adjusting a back pressure valve to stabilize the pressure of the pipeline at 3 kg, switching a six-way valve when the pressure is stable, introducing a sample in a quantitative ring into an analyzer for analysis, wherein the sulfur content read by the analyzer is 45.7mg/m3And the result of the repeated test is 46.3mg/m3The result is accurate.
Example 2
The test procedure was the same as in example 1, except that the temperature of the vaporizer was set to 120 ℃ without changing the sample. The results of the two tests are 46.1mg/m respectively3And 46.3mg/m3It was confirmed that the sample was completely gasified at 100 ℃ and thus had good reproducibility.
Example 3
The sulfur content of the liquefied petroleum gas sample is measured by the device shown in fig. 3, and the inlet 11 of the analyzer is connected with a sulfur content measuring instrument. The instrument power is switched on, the connection condition of the pipelines is checked, the temperature of the gasification chamber 3 is set to be 100 ℃, and the temperature of the quantitative ring 6 is set to be 60 ℃. And after the temperature reaches a set value, performing system purging and quantitative ring 6 filling processes, wherein the sample to be measured is a liquefied petroleum gas sample produced by a certain factory, and the volume of the quantitative ring is 3mL after gasification in a liquid sample introduction mode. And adjusting the back pressure valve to stabilize the pressure of the pipeline at 3 kg, switching the six-way valve when the pressure is stable, and introducing the sample in the quantitative ring into an analyzer for analysis. The results of the two tests are 12 respectively6.1mg/m3And 125.3mg/m3And the test result has good repeatability.
The sulfur content of the same lpg samples was measured using an imported brand lpg injector. The sample injector adopts liquid valve sample injection and liquid quantitative loop quantitative sample injection, and the measured test results are respectively 123.1mg/m3And 110.8mg/m3And 94.6mg/m3. Therefore, the liquid valve sample introduction and liquid quantitative loop quantitative mode adopted by the liquefied petroleum gas sample introduction device causes the repeatability of the test result to be poor. The test is continued, and the result shows that when the pressure of the sample is less than 5 kg, the liquid sample in the quantitative ring is difficult to ensure, and the existing micro bubbles have great influence on the repeatability of the test result.
Example 4
The procedure was as in example 3, except that the pressure was adjusted to atmospheric pressure. The measurement of a gaseous hydrocarbon sample was carried out, and the measurement result was 24mg/m3And 24.1mg/m3. When the gas sample is measured, the measurement can be performed by setting the line pressure to 1 kg.
Example 5
The test procedure is the same as that of example 3, except that the general sample injection device is connected to a nitrogen content detector, the nitrogen content of a certain gaseous hydrocarbon sample is measured, and the measurement result is 6.0mg/m3。
Example 6
The general sample injection device described in fig. 4 is used to measure the sulfur content of standard liquefied petroleum gas (standard sulfur gas, sulfur content is 0.7mg/kg), and the volumes of the quantitative rings 6a and 6b connected to the ten-way valve 5 are 2mL and 10mL respectively. Firstly, injecting sample by using 1a, using 6a for quantification, setting the pipeline pressure to be stable at 2 kg, and setting the spectrogram of sulfur in an integral curve to be unclear, wherein the baseline is unstable, and the measurement result is 1.0 mg/kg; the set pressure of the pipeline is adjusted to be 4 kg, the spectrum of sulfur in the integral curve is relatively clear, the baseline is stable compared with the baseline, and the measurement result is 0.8 mg/kg. The sample is injected by using the device 1b, the sample is quantified by using the device 6a, the pressure of the pipeline is set to be stable at 4 kg, the integral spectrogram of sulfur in the integral curve is clear, the baseline is stable, and the measurement result is 0.7 mg/kg. For the liquefied petroleum gas sample with low sulfur content, the accumulated sample introduction of the sulfur content can be realized by increasing the sample introduction amount, so that the sample introduction amount of sulfur in single determination is increased, the response value and the integral area of sulfur are improved, the spectrogram is clear, and the detection lower limit and the accuracy of the system are greatly improved.
Example 7
The general sample injection device described in fig. 4 is used to measure the sulfur content of standard liquefied petroleum gas (standard sulfur gas, sulfur content is 500mg/kg), and the volumes of the quantitative rings 6a and 6b connected to the ten-way valve 5 are 2mL and 10mL respectively. Firstly, injecting sample by using 1b, using 6b for quantification, setting the pressure of a pipeline to be stable at 4 kg, wherein the measurement result cannot be displayed and exceeds the upper limit of the detection of an instrument, and a flat peak appears on an integral spectrogram; using 1a as a sample, 6a as a quantitative determination, the line pressure was set to stabilize at 4 kg, and the measurement result was 498.0 mg/kg. For the liquefied petroleum gas sample with high sulfur content, the reduction sample introduction of the sulfur content can be realized by reducing the sample introduction amount, so that the sample introduction amount for measuring the sulfur in one time is reduced, and the detection upper limit and the application range of the system are greatly improved.
Claims (11)
1. A universal sample injection device for gaseous hydrocarbons and liquefied petroleum gas, comprising: sample introduction port (1), sample flow control valve (2), sample vaporizer (3), gas relief valve (4), passageway converting part (5), gaseous ration ring (6), carrier gas entry (7), carrier gas flowmeter (8), exhaust outlet (9), back pressure valve (10), analysis appearance entry (11), heating control module (12), sample introduction port (1) links to each other in proper order with sample flow control valve (2), sample vaporizer (3), gas relief valve (4), passageway converting part (5), gaseous ration ring (6) links to each other with passageway converting part (5), carrier gas entry (7) links to each other in proper order with carrier gas flowmeter (8), passageway converting part (5), analysis appearance entry (11) links to each other with passageway converting part (5), passageway converting part (5) and back pressure valve (10), The exhaust outlets (9) are sequentially connected, and the heating control module (12) is used for controlling the temperature of each component; the volume of the gas quantitative rings (6) is 1-10 mL, and the number of the gas quantitative rings (6) is two, namely, the gas quantitative rings are respectively large and small and have different volumes; the channel switching component (5) is a ten-way valve, a twelve-way valve or a fourteen-way valve.
2. The device according to claim 1, wherein the channel switching component (5) comprises a sample injection channel (51) and a measurement channel (52), and the sample injection channel (51) is connected with the quantitative ring (6), the backpressure valve (10) and the exhaust outlet (9) during sample injection; the measuring channel (52) is connected with the quantitative ring (6) and the analyzer inlet (11) when the sample is measured.
3. Device according to claim 1, characterized in that a filter is provided at the sample inlet (1) or carrier gas inlet (7).
4. The apparatus according to claim 1, wherein the temperature of said sample vaporization chamber (3) is controlled by said heating control module (12).
5. Device according to claim 1, characterized in that the channel switching member (5), the gas dosing ring (6) are of metal.
6. Device according to claim 1, characterized in that the inner surfaces of the channel switching member (5), the gas dosing ring (6) are provided with a sulfur passivating coating.
7. Device according to claim 1, characterized in that the channel switching means (5) are controlled automatically or manually.
8. Device according to claim 1, characterized in that a filter is added between the sample inlet (1) and the sample flow regulating valve (2).
9. The device according to claim 1, characterized in that a visually transparent tube is provided between the sample flow regulating valve (2) and the sample vaporizing chamber (3).
10. The device according to claim 1, characterized in that the analyzer inlet (11) is connected to a sulphur content detector, a nitrogen content detector, a metal content detector or a trace water detector.
11. A method for universal sample injection of gaseous hydrocarbons and liquefied petroleum gas using the sample injection apparatus according to any one of claims 1 to 10, comprising: 1) setting a channel conversion component (5) as a sample introduction mode, introducing a sample from a sample introduction port (1), gasifying the sample through a gasification chamber (3) through a flow regulating valve (2), reducing the pressure through a gas pressure reducing valve (4), and introducing the sample into a quantitative ring (6) through a sample introduction channel (51) of the channel conversion component (5); 2) setting the channel switching part (5) as a measurement mode, enabling the carrier gas introduced from the carrier gas inlet (7) to enter the quantitative ring (6) through the carrier gas flowmeter (8) and the measurement channel (52) of the channel switching part (5), and enabling the carrier gas and the sample in the quantitative ring (6) to enter the analyzer inlet (11) together for measurement operation.
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| CN108732287B (en) * | 2018-08-08 | 2024-01-12 | 成都科林分析技术有限公司 | Thermal desorption gas sampling device and method |
| CN111721753B (en) * | 2020-05-15 | 2023-06-30 | 上海应用技术大学 | Device and method for directly sampling oil |
| CN114910572A (en) * | 2021-02-10 | 2022-08-16 | 上海中化科技有限公司 | Sample introduction device and method, and quantitative analysis device and method |
| CN114062040B (en) * | 2021-11-10 | 2024-06-04 | 惠州市绿色能源与新材料研究院 | Liquid storage and quantitative sampling device, method and application thereof |
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| CN102156172A (en) * | 2010-02-11 | 2011-08-17 | 福州市产品质量检验所 | Method for measuring constituents of dimethyl ether liquefied petroleum gas |
| CN105092875A (en) * | 2015-09-24 | 2015-11-25 | 北京楚翔飞科技开发有限责任公司 | Full-automatic gas-liquid multi-purpose sample injector |
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