CN115326967A - Sample pretreatment system for on-line chromatographic analyzer for measuring natural gas components - Google Patents
Sample pretreatment system for on-line chromatographic analyzer for measuring natural gas components Download PDFInfo
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- CN115326967A CN115326967A CN202210982727.9A CN202210982727A CN115326967A CN 115326967 A CN115326967 A CN 115326967A CN 202210982727 A CN202210982727 A CN 202210982727A CN 115326967 A CN115326967 A CN 115326967A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
- G01N30/14—Preparation by elimination of some components
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
- G01N2030/201—Injection using a sampling valve multiport valves, i.e. having more than two ports
Abstract
The invention provides a sample pretreatment system of an online chromatographic analyzer for measuring natural gas components, which comprises a sample input pipeline, a gas circulation pipeline and a quantitative measuring pipeline. By the pretreatment system provided by the invention, impurities can be removed from a natural gas sample just produced before the sample is used for component measurement, real-time updating and quantitative measurement of the sample of the system are ensured, and the accuracy of a natural gas component measurement chromatographic analyzer is improved.
Description
Technical Field
The invention relates to the technical field of natural gas purification treatment, in particular to a sample pretreatment system of an online chromatographic analyzer for measuring natural gas components.
Background
With the continuous deepening of the development and utilization of natural gas, the natural gas becomes one of the main energy sources in China, and the natural gas resources mainly comprise three types: gas layer gas, associated gas and condensate gas reservoir gas. The gas layer gas is natural gas extracted from a gas storage layer; associated gas is natural gas produced along with crude oil when the crude oil is produced from an oil storage layer; the condensate gas reservoir gas is gas stored in a reservoir under the original condition of a stratum, but part of heavy hydrocarbon in natural gas is condensed into liquid along with pressure reduction in the process of exploitation, part of heavy hydrocarbon is left underground, and part of heavy hydrocarbon is exploited to the ground along with the natural gas. At present, most of natural gas used in various countries in the world is gas layer gas, for example, the produced gas layer gas is mainly used in the Sichuan gas field and the Changqing gas field in China, the gas condensate of the Hongkong oil field is more, and most of natural gas of other oil fields is associated gas. It follows that natural gas that is diverted from gas well heads or from oil and gas separators in mines will contain varying amounts of heavier hydrocarbons as well as non-hydrocarbon gases such as water vapor, sulfur compounds (e.g., hydrogen sulfide), carbon dioxide, nitrogen and helium, which we refer to as raw natural gas or moisture.
The heat value, the white number, the density, the relative density and the like of natural gas as a mixture are important indexes, the qualitative and quantitative accuracy of natural gas components directly influences the indexes of the heat value, the density and the like of the natural gas, and the conventional natural gas component detection has larger errors in the quantitative and qualitative detection aspect of the main components of the natural gas.
Disclosure of Invention
In order to solve the problems, the invention provides a sample pretreatment system of an online chromatographic analyzer for measuring components of natural gas, which is used for pretreating a natural gas sample for component detection, removing impurities, water and other factors influencing the detection of a TCD (thermal conductivity detector) detector, and quantitatively and qualitatively detecting the detected sample.
The utility model provides a be used for online chromatographic analyzer sample preliminary treatment system that natural gas component was measured, includes sample input pipeline, gas flow pipeline and quantitative measurement pipeline, its characterized in that, the three-way valve in sample input pipeline connection to gas flow pipeline, gas flow pipeline contain a plurality of circulation branches, carry out the circulation branch road that the component detected and the ten-way valve switch-on in the quantitative measurement pipeline.
Further, an online chromatographic analyzer sample pretreatment system for measuring natural gas components is characterized in that a sample input pipeline comprises a gas transmission pipeline into which natural gas samples enter, a sampling flange and a closed fastening piece which sample from the gas transmission pipeline are arranged, a first ball valve and a first pressure reducing valve are sequentially arranged behind the sampling flange and the fastening piece, and a first pressure gauge is arranged to observe pipeline pressure.
Further, the sample pretreatment system for the on-line chromatographic analyzer for measuring the natural gas components is characterized in that a sample input pipeline is connected to a gas circulation pipeline three-way valve, an input natural gas sample is firstly shunted in the three-way valve, a circulation branch of the first shunting is connected with a safety valve, and a circulation branch of the second shunting is connected with a gathering filter and then shunted for the second time; and a first flowmeter is arranged on a third circulation branch of the second flow distribution, and a second flowmeter is arranged on a fourth circulation branch and is connected to a ten-way valve of the quantitative measurement pipeline.
Further, the system for preprocessing the sample of the on-line chromatographic analyzer for measuring the natural gas component is characterized in that the flow branch is connected with a safety valve, then is converged with a flow branch III provided with a flow meter I and is connected with a ball valve II, and then is communicated to an FLR pipe to discharge the gas accumulated in the pipeline in the last time period.
The system for sample pretreatment of the on-line chromatographic analyzer for natural gas component measurement as claimed in claim 1, wherein the quantitative measurement pipeline comprises a ten-way valve, a sample outlet pipeline, a carrier gas pipeline and a detection pipeline; the gas-carrying pipeline and a pipeline for natural gas to enter are connected with different valve ports in the ten-way valve to form a quantitative ring, a certain amount of sample is transmitted to the TCD detector for component detection after the quantitative ring is full of gas, and the sample outlet pipeline is sequentially provided with a flow switch FS and a second pressure gauge and then connected with a second pressure reducing valve to discharge surplus sample.
Furthermore, the system for preprocessing the sample of the on-line chromatographic analyzer for measuring the natural gas components is characterized in that two quantitative rings formed by the ten-way valve in the quantitative measurement pipeline can be filled with gas within a certain time and are alternately connected to the chromatographic analyzer for use.
The invention has the beneficial effects that: the invention provides a system for pretreating a natural gas sample aiming at natural gas component measurement and chromatographic analysis, and relates to a sample pretreatment system of an online chromatographic analyzer for natural gas component measurement.
Drawings
FIG. 1 is a block diagram of a sample pretreatment system of an on-line chromatograph for measuring natural gas components according to the present invention.
Fig. 2 is a port setting diagram of a ten-way valve used in the pretreatment system according to the present invention.
The system comprises a gas transmission pipeline 1, a ball valve 2, a pressure reducing valve I3-1, a pressure reducing valve II 3-2, a pressure gauge I4-1, a pressure gauge II 4-2, a safety valve 5, a three-way valve 6, a collecting filter 7, a flowmeter I8-1, a flowmeter II 8-2, a ten-way valve 9-9, a valve port 90,91,92,93,94,95,96,97,98,99, a ten-way valve port 10, a flow switch 11, a sampling flange and a sealing fastener.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
The utility model provides a be used for online chromatographic analyzer sample preliminary treatment system that natural gas component was measured, includes sample input pipeline, gas flow pipeline and quantitative measurement pipeline, its characterized in that, the three-way valve in sample input pipeline connection to gas flow pipeline, gas flow pipeline contain a plurality of circulation branches, carry out the circulation branch road that the component detected and the ten-way valve switch-on in the quantitative measurement pipeline.
A system for pretreating a sample of an online chromatographic analyzer for measuring components of natural gas is shown in a system structure diagram in figure 1, when component detection chromatographic analysis is carried out on natural gas which is just mined, the natural gas which is just mined contains a lot of solid impurities and moisture, if TCD is directly used for carrying out chromatographic component detection analysis, on one hand, the accuracy of a detection result is reduced, on the other hand, the loss of a chromatographic detection instrument is increased, and the instrument is damaged. In the embodiment, a natural gas sample enters from a gas transmission pipeline 1, a sampling flange and a closed fastener 11 sample the natural gas sample and guide the natural gas sample into a system, after the natural gas sample enters the system, the natural gas sample is adjusted through a first ball valve 2-1 and a first pressure reducing valve 3-1, the pressure intensity of the entering natural gas sample is observed in real time through a first pressure gauge 4-1, and the normal operation of the whole gas sample input pipeline is ensured.
In this embodiment, as shown in fig. 1, after a sample enters through an input pipeline, in order to avoid redundant accumulation of a natural gas sample in a pipeline and ensure that a gas sample detected by a chromatography detector is a newly input gas in a current time period, a gas circulation pipeline is arranged in the sample preprocessing system provided by the invention to lead out redundant gas in the system, so as to realize gas circulation and real-time detection. In this embodiment, after the gas enters the circulation pipeline, the three-way valve arranged on the circulation pipeline is used for first shunting, the sample is divided into a first circulation branch needing to be discharged from the system and a second circulation branch needing to be further processed, a safety valve is arranged on the first circulation branch, the second circulation branch is sent into the aggregation filter to remove impurities of the natural gas sample and is shunted again, and the natural gas sample in the second circulation branch is continuously divided into a third circulation branch needing to be discharged from the system and a fourth circulation branch sent into the chromatographic detector to be subjected to component measurement by the shunting. The flow meter I8-1 is arranged on the flow branch III to facilitate management, the flow meter I is converged with the flow branch I and connected with a ball valve after the flow meter is arranged, the flow meter I is connected to the FLR pipe through the ball valve, and the gas of the whole system is circulated and detected in real time through the flow branch I and the flow branch III.
In this embodiment, after two times of diversion, the remaining flow branch is a sample pipeline transmitted to the chromatography detector for monitoring components of the natural gas sample in the system, a second flow meter 8-2 is arranged on the flow branch and connected to a ten-way valve 9 in the quantitative detection pipeline, as shown in fig. 2, the ten-way valve 9 comprises ten ports, which are 90,91,.
In addition, in the embodiment, in the quantitative detection pipeline, the first quantitative ring and the second quantitative ring can be filled with gas within a certain time, in order to ensure that the surplus condition of the natural gas sample in the ten-way valve 9 does not exist, the quantitative detection pipeline is also provided with a sample outlet pipeline for discharging the surplus natural gas sample, and the sample outlet pipeline is sequentially provided with a flow switch 10, a pressure gauge II 4-2 and a pressure reducing valve II 3-2 to send the surplus gas sample out of the pretreatment system.
The invention provides a system for pretreating a natural gas sample, in particular to a sample pretreatment system of an online chromatographic analyzer for measuring natural gas components, which is applied to component detection and analysis of exploited natural gas, impurities and moisture of a natural gas sample which is just exploited are filtered through an aggregation filter, a plurality of gas circulation pipelines are designed, the sample detected by TCD chromatographic detection is ensured to be updated in real time, accumulation and redundant impurities of the natural gas sample in the pipeline are avoided, meanwhile, a chromatographic detection pipeline with a ten-way valve is selected, two alternatively used natural gas sample quantitative rings are utilized, the gas sample is filled in a certain time, and then the gas sample is sent to a TCD chromatographic detector for quantitative detection, and the accuracy of the component measurement of the natural gas sample is ensured.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a be used for online chromatographic analyzer sample preliminary treatment system that natural gas component was measured, includes sample input pipeline, gas flow pipeline and quantitative measurement pipeline, its characterized in that, three-way valve (6) in the sample input pipeline is connected to the gas flow pipeline, and the gas flow pipeline contains a plurality of circulation branches, carries out the circulation branch road that the component detected and ten-way valve (9) switch-on in the quantitative measurement pipeline.
2. The system for pretreating the sample of the on-line chromatographic analyzer for measuring the natural gas component as claimed in claim 1, wherein the sample input pipeline comprises a gas transmission pipeline (1) for inputting the natural gas sample, a sampling flange for sampling from the gas transmission pipeline and a closed fastener (11), a ball valve I (2-1) and a pressure reducing valve I (3-1) are sequentially arranged behind the sampling flange and the fastener, and a pressure gauge I (4-1) is arranged for observing the pressure of the pipeline.
3. The sample pretreatment system for the on-line chromatographic analyzer for measuring the natural gas component as claimed in claim 1, wherein the sample input pipeline is connected to a gas flow pipeline three-way valve (6), the input natural gas sample is firstly branched at the three-way valve (6), a flow branch of the first branching is connected with a safety valve (5), and a flow branch of the second branching is connected with a concentration filter (7) and then is branched for the second time; and a first flowmeter (8-1) is arranged on the third flow branch of the second flow division, and a second flowmeter (8-2) is arranged on the fourth flow branch and is connected to a ten-way valve (9) of the quantitative measurement pipeline.
4. The system for sample pretreatment of the on-line chromatographic analyzer for measuring the natural gas component as claimed in claim 3, wherein the first flow branch is connected with the safety valve (5), then is merged with a third flow branch provided with a first flowmeter (8-1), is connected with a second ball valve (2-2), and is communicated with the FLR pipe to discharge the gas accumulated in the pipeline in the previous time period.
5. The sample pretreatment system of the on-line chromatographic analyzer for measuring the natural gas component as claimed in claim 1, wherein the quantitative measurement pipeline comprises a ten-way valve (9), a sample outlet pipeline, a gas carrying pipeline and a detection pipeline; the gas-carrying pipeline and a pipeline for natural gas to enter are connected with different valve ports in a ten-way valve (9) to form a quantitative ring, a certain amount of sample is transmitted to a TCD detector for component detection after the quantitative ring is full of gas, a sample outlet pipeline is sequentially provided with a flow switch FS (10) and a second pressure gauge (4-2), and then is connected with a second pressure reducing valve (3-2) to discharge surplus sample.
6. The system for sample pretreatment of the on-line chromatographic analyzer for natural gas component measurement as claimed in claim 1, wherein the quantitative measurement pipeline comprises two quantitative rings formed by ten-way valves, and the quantitative rings can be filled with gas for a certain time and alternately connected to the chromatographic analyzer for measurement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210982727.9A CN115326967A (en) | 2022-08-16 | 2022-08-16 | Sample pretreatment system for on-line chromatographic analyzer for measuring natural gas components |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210982727.9A CN115326967A (en) | 2022-08-16 | 2022-08-16 | Sample pretreatment system for on-line chromatographic analyzer for measuring natural gas components |
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| CN115326967A true CN115326967A (en) | 2022-11-11 |
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| CN202210982727.9A Pending CN115326967A (en) | 2022-08-16 | 2022-08-16 | Sample pretreatment system for on-line chromatographic analyzer for measuring natural gas components |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117109996A (en) * | 2023-10-25 | 2023-11-24 | 成都蓝湖科技有限公司 | Analysis sampling system of sulfur analysis ratio instrument |
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| CN103913519A (en) * | 2013-01-05 | 2014-07-09 | 中国地质科学院矿产资源研究所 | Gas chromatography system for natural gas hydrate and detection method for components of natural gas hydrate |
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| CN117109996B (en) * | 2023-10-25 | 2024-01-02 | 成都蓝湖科技有限公司 | Analysis sampling system of sulfur analysis ratio instrument |
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