CN111239308A - Online high-vacuum negative-pressure gas sampling system and method - Google Patents
Online high-vacuum negative-pressure gas sampling system and method Download PDFInfo
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- CN111239308A CN111239308A CN202010014671.9A CN202010014671A CN111239308A CN 111239308 A CN111239308 A CN 111239308A CN 202010014671 A CN202010014671 A CN 202010014671A CN 111239308 A CN111239308 A CN 111239308A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005070 sampling Methods 0.000 title claims abstract description 22
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 239000012159 carrier gas Substances 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 231100000419 toxicity Toxicity 0.000 abstract description 2
- 230000001988 toxicity Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000012840 feeding operation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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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
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
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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
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
- G01N2030/201—Injection using a sampling valve multiport valves, i.e. having more than two ports
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Abstract
The invention discloses an online high vacuum negative pressure gas sampling system and method, comprising a six-way valve V1, a six-way valve V2, a quantitative ring and a vacuum pump, wherein the six-way valve V1 is communicated with the six-way valve V2 through a pipe fitting, the six-way valve V2 is communicated with the vacuum pump through a pipe fitting, and the six-way valve V1 is fixedly communicated with the quantitative ring through a pipe fitting, the system is scientific and reasonable, is safe and convenient to use, avoids the phenomenon that the total amount of a sample is required to be larger when a gas chromatograph analyzes a gas sample and is far larger than the amount of the sample actually subjected to sampling analysis, has a sealed gas path, can avoid the phenomena of sample leakage and external air internal leakage, ensures that the sample analysis effect is more accurate, completely isolates a sample loop from the outside, does not pollute the environment and harm human health under the condition that the sample has radioactivity or toxicity, has less demand on the analysis sample amount, the method is favorable for the accuracy of measured data, and the processes of sample analysis and quantitative ring pumping negative pressure can be synchronously performed, thereby realizing on-line analysis.
Description
Technical Field
The invention relates to the technical field of sample introduction of gas chromatographs, in particular to an online high-vacuum negative-pressure gas sample introduction system and method.
Background
When the existing gas chromatograph analyzes a gas sample, positive pressure sample introduction, normal pressure sample introduction or continuous negative pressure sample introduction are adopted, the total amount of sample is far larger than the amount of the sample actually subjected to sample introduction analysis, and the sample introduction methods can not meet the analysis requirements of scientific research institutions or universities, so that under the condition of small gas yield in the experimental process, the sample is radioactive and toxic, if the conventional sample introduction method is adopted, the sample introduction amount is too much, the sample introduction analysis can not be well performed, the environment is polluted, the human health is harmed, and inaccurate data can be caused by air interference, so that people need an online high-vacuum negative pressure gas sample introduction system and method to solve the problems.
Disclosure of Invention
The invention aims to provide an online high-vacuum negative-pressure gas sampling system and method to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
an online high vacuum negative pressure gas sampling system comprises a six-way valve V1, a dosing ring, a vacuum gauge, a vacuum pump and a pressure gauge, wherein the six-way valve V1 comprises a V1 first valve port, a V1 second valve port, a V1 third valve port, a V1 fourth valve port, a V1 fifth valve port and a V1 sixth valve port, the V1 first valve port is communicated with the V1 sixth valve port in a closed state of the six-way valve V1, the V1 second valve port is communicated with the V1 third valve port, the V1 fourth valve port is communicated with the V1 fifth valve port, the V1 fifth valve port is communicated with the V1 in an open state of the six-way valve V1, the V1 is communicated with the V1 first valve port, the V1 is communicated with the, the second valve port of V2 is communicated with the third valve port of V2, the fourth valve port of V2 is communicated with the fifth valve port of V2, when the six-way valve V2 is in an open state, the first valve port of V2 is communicated with the second valve port of V2, the third valve port of V2 is communicated with the fourth valve port of V2, the fifth valve port of V2 is communicated with the sixth valve port of V2, the sixth valve port of V1 is fixedly communicated with a manometer through a pipe fitting, one end of the manometer far from the sixth valve port of V1 is fixedly communicated with an external sample inlet pipe, the first valve port of V1 is fixedly communicated with a manometer through a pipe fitting, one end of the manometer far from the sixth valve port of V1 is fixedly communicated with an external sample inlet pipe, the fifth valve port of V1 is fixedly communicated with a dosing ring through a pipe fitting, one end of the dosing ring far from the fifth valve port of V1 is fixedly communicated with the second valve port of V1 through a pipe fitting, the first valve port of V1 is communicated with the second valve, the V1 fourth valve port is fixedly communicated with a V2 fifth valve port through a pipe fitting, the V2 fourth valve port is fixedly communicated with a vacuum gauge through a pipe fitting, one end, away from the V2 fourth valve port, of the vacuum gauge is fixedly communicated with a vacuum pump through a pipe fitting, one end, away from the vacuum gauge, of the vacuum pump is fixedly connected with a vent pipeline, and the V2 first valve port is fixedly communicated with an external chromatographic column through a pipe fitting.
An online high-vacuum negative-pressure gas sampling method comprises the following steps:
1) negative pressure is pumped in the quantitative ring to ensure that the inner part of the quantitative ring is in a vacuum state;
2) after the quantitative ring is vacuumized, an operator controls the quantitative ring to be communicated with a sample inlet, and the quantitative ring performs negative pressure sample injection;
3) after the quantitative loop sample injection is finished, an operator controls the quantitative loop to be communicated with a carrier gas path, and a sample enters an external chromatographic column for analysis along with carrier gas;
the step 1) specifically comprises the following steps:
a) an operator closes the six-way valve V1, closes the six-way valve V2, and at the moment, the plug, the V2 third valve port, the V2 second valve port, the V1 third valve port, the V1 second valve port, the dosing ring, the V1 fifth valve port, the V1 fourth valve port, the V2 fifth valve port, the V2 fourth valve port, the vacuum gauge and the vacuum pump are communicated in sequence to form a passage;
b) the operator opens the vacuum pump to start pumping the quantitative ring negative pressure, and waits for the vacuum count value to reach 1 × 10-1When Pa is needed, the system reaches a vacuum state, and the quantitative circular pumping negative pressure is completed.
The step 2) specifically comprises the following steps: an operator opens the six-way valve V1, the six-way valve V2 is kept closed continuously, at the moment, the sample feeding pipe, the V1 sixth valve port, the V1 first valve port and the quantitative ring are communicated in sequence to form a passage, and a sample enters the quantitative ring from the sample feeding pipe by utilizing pressure difference.
The step 3) specifically comprises the following steps: an operator controls the six-way valve V1 to be closed, the six-way valve V2 is opened, at the moment, an external carrier gas pipeline, a V2 sixth valve port, a V2 fifth valve port, a V1 fourth valve port, a V1 fifth valve port, a quantitative ring, a V1 second valve port, a V1 third valve port, a V2 second valve port, a V2 first valve port and an external chromatographic column are communicated in sequence to form a passage, carrier gas enters a system from the external carrier gas pipeline, a sample in the quantitative ring is sent into the external chromatographic column, sample introduction is completed, and the chromatographic column performs sample analysis.
In the process of opening the six-way valve V1, the vacuum pump is always in an open state, so that the negative pressure in the system is maintained conveniently, and the continuous sample feeding operation of the system is facilitated.
Compared with the prior art, the invention has the beneficial effects that:
when the existing gas chromatograph is used for analyzing a gas sample, positive pressure sample introduction, normal pressure sample introduction or continuous negative pressure sample introduction is adopted, the total amount of the sample is greatly required and is far larger than the amount of the sample actually subjected to sample introduction analysis, the sample introduction methods can not meet the analysis requirements of scientific research institutions or universities, under the condition that the gas yield in the experimental process is very small, and under the condition that the sample has radioactivity and toxicity, if the conventional sample introduction method is adopted, the sample introduction amount is too much, the sample introduction analysis can not be well performed, the environment is polluted, the human health is harmed, and the data is inaccurate due to air interference, but the invention changes the conventional single sample introduction valve or airtight needle sample introduction method, adopts a double valve, a pressure gauge, a vacuum meter and a vacuum pump, is a high vacuum negative pressure sample introduction method, can reduce the sample introduction amount requirement and meet the specific application requirements, the method has the advantages of less requirement on sample analysis amount, capability of avoiding external air interference, sample integrity guarantee and data measurement accuracy. The whole system can realize infinite circulation sample introduction.
Drawings
Fig. 1 is a schematic structural diagram of an online high-vacuum negative-pressure gas sampling system and method according to the present invention, when a six-way valve V1 is closed and a six-way valve V2 is closed;
FIG. 2 is a schematic structural diagram of the online high vacuum negative pressure gas sampling system and method of the present invention when the six-way valve V1 is opened and the six-way valve V2 is closed;
fig. 3 is a schematic structural diagram of the online high-vacuum negative-pressure gas sampling system and method in the states of the six-way valve V1 being closed and the six-way valve V2 being open.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: as shown in fig. 1-3, an online high vacuum negative pressure gas sampling system includes a six-way valve V1, a dosing ring, a vacuum meter, a vacuum pump, and a pressure gauge, where the six-way valve V1 includes a V1 first port, a V1 second port, a V1 third port, a V1 fourth port, a V1 fifth port, and a V1 sixth port, where the V1 first port is communicated with the V1 sixth port, the V1 second port is communicated with the V1 third port, the V1 fourth port is communicated with the V1 fifth port, and the V1 sixth port is communicated with the V1 second port, and the V1 second port is communicated with the V1 first port, and the V1 second port is communicated with the V1, and the V1 lower port, the second valve port of V2 is communicated with the third valve port of V2, the fourth valve port of V2 is communicated with the fifth valve port of V2, when the six-way valve V2 is in an open state, the first valve port of V2 is communicated with the second valve port of V2, the third valve port of V2 is communicated with the fourth valve port of V2, the fifth valve port of V2 is communicated with the sixth valve port of V2, the sixth valve port of V1 is fixedly communicated with a pressure gauge through a pipe, one end of the pressure gauge, which is far away from the sixth valve port of V1, is fixedly communicated with an external sample inlet pipe, one end of the pressure gauge, which is far away from the sixth valve port of V1, is fixedly communicated with an external sample inlet pipe, the fifth valve port of V1 is fixedly communicated with a dosing ring through a pipe, one end of the dosing ring, which is far away from the fifth valve port of V1, is fixedly communicated with the second valve port of V1 through a pipe, the third valve port of V1 is fixedly communicated with the second valve port of V2 through a pipe, the third valve, the V2 fourth valve port is fixed through the pipe fitting and is communicated with the vacuum gauge, the vacuum gauge is kept away from V2 fourth valve port one end and is fixed through the pipe fitting and is communicated with the vacuum pump, the vacuum pump is kept away from vacuum gauge one end fixedly connected with unloading pipeline, the V2 first valve port is fixed through the pipe fitting and is communicated with the external chromatographic column.
An online high-vacuum negative-pressure gas sampling method comprises the following steps:
1) negative pressure is pumped in the quantitative ring to ensure that the inner part of the quantitative ring is in a vacuum state;
2) after the quantitative ring is vacuumized, an operator controls the quantitative ring to be communicated with a sample inlet, and the quantitative ring performs negative pressure sample injection;
3) after the quantitative loop sample injection is finished, an operator controls the quantitative loop to be communicated with a carrier gas path, and a sample enters an external chromatographic column for analysis along with carrier gas;
the step 1) specifically comprises the following steps:
a) an operator closes the six-way valve V1, closes the six-way valve V2, and at the moment, the plug, the V2 third valve port, the V2 second valve port, the V1 third valve port, the V1 second valve port, the dosing ring, the V1 fifth valve port, the V1 fourth valve port, the V2 fifth valve port, the V2 fourth valve port, the vacuum gauge and the vacuum pump are communicated in sequence to form a passage;
b) the operator opens the vacuum pump to start pumping the quantitative ring negative pressure, and waits for the vacuum count value to reach 1 × 10-1When Pa is needed, the system reaches a vacuum state, and the quantitative circular pumping negative pressure is completed.
Step 2): an operator opens the six-way valve V1, the six-way valve V2 is kept closed continuously, at the moment, the sample feeding pipe, the V1 sixth valve port, the V1 first valve port and the quantitative ring are communicated in sequence to form a passage, and a sample enters the quantitative ring from the sample feeding pipe by utilizing pressure difference.
Step 3): an operator controls the six-way valve V1 to be closed, the six-way valve V2 is opened, at the moment, an external carrier gas pipeline, a V2 sixth valve port, a V2 fifth valve port, a V1 fourth valve port, a V1 fifth valve port, a quantitative ring, a V1 second valve port, a V1 third valve port, a V2 second valve port, a V2 first valve port and an external chromatographic column are communicated in sequence to form a passage, carrier gas enters a system from the external carrier gas pipeline, a sample in the quantitative ring is sent into the external chromatographic column, sample introduction is completed, and the chromatographic column performs sample analysis.
In the process of opening the six-way valve V1, the vacuum pump is always in an open state, so that the negative pressure in the system is maintained conveniently, and the continuous sample feeding operation of the system is facilitated.
Example two: an on-line high vacuum negative pressure gas sampling system comprises a six-way valve V, a quantitative ring, a vacuum gauge, a vacuum pump and a pressure gauge, wherein the six-way valve V comprises a V third valve port, a V fourth valve port, a V fifth valve port, a V sixth valve port, a V first valve port and a V second valve port, the V third valve port is communicated with the V second valve port, the V fourth valve port is communicated with the V fifth valve port, the V sixth valve port is communicated with the V fourth valve port, the V fifth valve port is communicated with the V sixth valve port, the V first valve port is communicated with the V second valve port, the V third valve port is communicated with the V second valve port in the V state of the six-way valve V, the V fourth valve port is communicated with the V fifth valve port, the sixth valve port of V2 is communicated with the first valve port of V2, in the opened state of the six-way valve V2, the third valve port of V2 is communicated with the fourth valve port of V2, the fifth valve port of V2 is communicated with the sixth valve port of V2, the first valve port of V2 is communicated with the second valve port of V2, the second valve port of V1 is fixedly communicated with a pressure gauge through a pipe, one end of the pressure gauge, far away from the second valve port of V1, is fixedly communicated with an external sample inlet pipe, the third valve port of V1 is fixedly communicated with a pressure gauge through a pipe, one end of the pressure gauge, far away from the second valve port of V1, is fixedly communicated with an external sample inlet pipe, the first valve port of V1 is fixedly communicated with a dosing ring through a pipe, one end of the dosing ring, far away from the first valve port of V1, is fixedly communicated with the fourth valve port of V42 through a pipe, the fifth valve port of V1 is fixedly communicated with the fourth valve port of V2 through a pipe, the fifth valve port of V2 is provided with, the vacuum pump is fixedly communicated with one end, far away from the V2 sixth valve port, of the vacuum meter through a pipe fitting, the emptying pipeline is fixedly connected with one end, far away from the vacuum meter, of the vacuum pump, and the V2 third valve port is fixedly communicated with an external chromatographic column through a pipe fitting.
An online high-vacuum negative-pressure gas sampling method comprises the following steps:
1) negative pressure is pumped in the quantitative ring to ensure that the inner part of the quantitative ring is in a vacuum state;
2) after the quantitative ring is vacuumized, an operator controls the quantitative ring to be communicated with a sample inlet, and the quantitative ring performs negative pressure sample injection;
3) after the quantitative loop sample injection is finished, an operator controls the quantitative loop to be communicated with a carrier gas path, and a sample enters an external chromatographic column for analysis along with carrier gas;
the step 1) specifically comprises the following steps:
a) an operator closes the six-way valve V1 and closes the six-way valve V2, and at the moment, the plug, the V2 fifth valve port, the V2 fourth valve port, the V1 fifth valve port, the V1 fourth valve port, the dosing ring, the V1 first valve port, the V1 sixth valve port, the V2 first valve port, the V2 sixth valve port, the vacuum gauge and the vacuum pump are communicated in sequence to form a passage;
b) the operator opens the vacuum pump to start pumping the quantitative ring negative pressure, and waits for the vacuum count value to reach 1 × 10-1When Pa is needed, the system reaches a vacuum state, and the quantitative circular pumping negative pressure is completed.
Step 2): an operator opens the six-way valve V1, the six-way valve V2 is kept closed continuously, at the moment, the sample feeding pipe, the V1 second valve port, the V1 third valve port and the quantitative ring are communicated in sequence to form a passage, and a sample enters the quantitative ring from the sample feeding pipe by utilizing pressure difference.
Step 3): an operator controls the six-way valve V1 to be closed, the six-way valve V2 is opened, at the moment, an external carrier gas pipeline, a V2 second valve port, a V2 first valve port, a V1 sixth valve port, a V1 first valve port, a quantitative ring, a V1 fourth valve port, a V1 fifth valve port, a V2 fourth valve port, a V2 third valve port and an external chromatographic column are communicated in sequence to form a passage, carrier gas enters a system from the external carrier gas pipeline, a sample in the quantitative ring is sent into the external chromatographic column, sample introduction is completed, and the chromatographic column performs sample analysis.
In the process of opening the six-way valve V1, the vacuum pump is always in an open state, so that the negative pressure in the system is maintained conveniently, and the continuous sample feeding operation of the system is facilitated.
Example three: an online high vacuum negative pressure gas sampling system comprises a six-way valve V, a quantitative ring, a vacuum gauge, a vacuum pump and a pressure gauge, wherein the six-way valve V comprises a V fifth valve port, a V sixth valve port, a V first valve port, a V second valve port, a V third valve port and a V fourth valve port, the V fifth valve port is communicated with the V fourth valve port in a closed state of the six-way valve V, the V sixth valve port is communicated with the V first valve port, the V second valve port is communicated with the V third valve port in an open state of the six-way valve V, the V first valve port is communicated with the V second valve port, the V third valve port is communicated with the V fourth valve port, the V fifth valve port is communicated with the V fourth valve port in a closed state of the six-way valve V, the second valve port of V2 is communicated with the third valve port of V2, in the opened state of the six-way valve V2, the fifth valve port of V2 is communicated with the sixth valve port of V2, the first valve port of V2 is communicated with the second valve port of V2, the third valve port of V2 is communicated with the fourth valve port of V2, the fourth valve port of V1 is fixedly communicated with a pressure gauge through a pipe, one end of the pressure gauge, far away from the fourth valve port of V1, is fixedly communicated with an external sample inlet pipe, the fifth valve port of V1 is fixedly communicated with a pressure gauge through a pipe, one end of the pressure gauge, far away from the fourth valve port of V1, is fixedly communicated with an external sample inlet pipe, the third valve port of V1 is fixedly communicated with a dosing ring through a pipe, one end of the dosing ring, far away from the third valve port of V1, is fixedly communicated with the sixth valve port of V42 through a pipe, the first valve port of V1 is fixedly communicated with the sixth valve port of V2 through a pipe, a choke plug is installed on the first valve port of, one end of the vacuum gauge, which is far away from the second valve port of the V2, is fixedly communicated with a vacuum pump through a pipe fitting, one end of the vacuum pump, which is far away from the vacuum gauge, is fixedly connected with an emptying pipeline, and the fifth valve port of the V2 is fixedly communicated with an external chromatographic column through a pipe fitting.
An online high-vacuum negative-pressure gas sampling method comprises the following steps:
1) negative pressure is pumped in the quantitative ring to ensure that the inner part of the quantitative ring is in a vacuum state;
2) after the quantitative ring is vacuumized, an operator controls the quantitative ring to be communicated with a sample inlet, and the quantitative ring performs negative pressure sample injection;
3) after the quantitative loop sample injection is completed, an operator controls the quantitative loop to be communicated with a carrier gas path, and a sample enters an external chromatographic column for analysis along with carrier gas.
The step 1) specifically comprises the following steps:
a) an operator closes the six-way valve V1 and closes the six-way valve V2, and at the moment, the plug, the V2 first valve port, the V2 sixth valve port, the V1 first valve port, the V1 sixth valve port, the dosing ring, the V1 third valve port, the V1 second valve port, the V2 third valve port, the V2 second valve port, the vacuum gauge and the vacuum pump are communicated in sequence to form a passage;
b) the operator opens the vacuum pump to start pumping the quantitative ring negative pressure, and waits for the vacuum count value to reach 1 × 10-1When Pa is needed, the system reaches a vacuum state, and the quantitative circular pumping negative pressure is completed.
Step 2): an operator opens the six-way valve V1, the six-way valve V2 is kept closed continuously, at the moment, the sample feeding pipe, the V1 fourth valve port, the V1 fifth valve port and the quantitative ring are communicated in sequence to form a passage, and a sample enters the quantitative ring from the sample feeding pipe by utilizing pressure difference.
Step 3): an operator controls the six-way valve V1 to be closed, the six-way valve V2 is opened, at the moment, an external carrier gas pipeline, a V2 fourth valve port, a V2 third valve port, a V1 second valve port, a V1 third valve port, a quantitative ring, a V1 sixth valve port, a V1 first valve port, a V2 sixth valve port, a V2 fifth valve port and an external chromatographic column are communicated in sequence to form a passage, carrier gas enters a system from the external carrier gas pipeline, a sample in the quantitative ring is sent into the external chromatographic column, sample introduction is completed, and the chromatographic column performs sample analysis.
In the process of opening the six-way valve V1, the vacuum pump is always in an open state, so that the negative pressure in the system is maintained conveniently, and the continuous sample feeding operation of the system is facilitated.
The working principle of the invention is as follows:
an operator closes the six-way valve V1 and closes the six-way valve V2, at the moment, the plug, the V2 third valve port, the V2 second valve port, the V1 third valve port, the V1 second valve port, the dosing ring, the V1 fifth valve port, the V1 fourth valve port, the V2 fifth valve port, the V2 fourth valve port, the vacuum gauge and the vacuum pump are communicated in sequence to form a passage, and then the operator opens the vacuum pumpStarting to pump a certain amount of annular negative pressure, and waiting for the vacuum count value to reach 1 × 10-1When Pa is reached, the system reaches a vacuum state, the quantitative ring finishes negative pressure pumping, after the negative pressure pumping is finished, an operator opens the six-way valve V1, the six-way valve V2 is kept closed continuously, at the moment, the sample inlet pipe, the V1 sixth valve port, the V1 first valve port and the quantitative ring are communicated in sequence to form a passage, a sample enters the quantitative ring from the sample inlet pipe by utilizing pressure difference, after the sample introduction of the quantitative ring is finished, after a sample enters the quantitative ring, an operator controls the six-way valve V1 to be closed, the six-way valve V2 is opened, at the moment, the external carrier gas pipeline, the V2 sixth valve port, the V2 fifth valve port, the V1 fourth valve port, the V1 fifth valve port, the quantitative ring, the V1 second valve port, the V1 third valve port, the V2 second valve port, the V2 first valve port and the external chromatographic column are communicated in sequence to form a channel, the carrier gas enters the system from the external carrier gas pipeline, the sample in the quantitative ring is sent into the external chromatographic column, the sample introduction is finished, and the chromatographic column performs sample analysis.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The utility model provides an online high vacuum negative pressure gas sampling system which characterized in that: the six-way valve V comprises a V first valve port, a V second valve port, a V third valve port, a V fourth valve port, a V fifth valve port and a V sixth valve port, the V first valve port is communicated with the V sixth valve port, the V second valve port is communicated with the V third valve port, the V fourth valve port is communicated with the V fifth valve port, the V sixth valve port is communicated with the V fifth valve port, the V first valve port is communicated with the V second valve port, the V third valve port is communicated with the V fourth valve port, the V fifth valve port is communicated with the V sixth valve port, the V first valve port is communicated with the V sixth valve port, the V second valve port is communicated with the V third valve port in the open state of the six-way valve V, the V2 fourth valve port is communicated with the V2 fifth valve port, when the six-way valve V2 is in an open state, the V2 first valve port is communicated with the V2 second valve port, the V2 third valve port is communicated with the V2 fourth valve port, the V2 fifth valve port is communicated with the V2 sixth valve port, the V1 sixth valve port is fixedly communicated with a pressure gauge through a pipe fitting, one end of the pressure gauge, far away from the V1 sixth valve port, is fixedly communicated with an external sample feeding pipe, the V1 first valve port is fixedly communicated with a pressure gauge through a pipe fitting, one end of the pressure gauge, far away from the V1 sixth valve port, is fixedly communicated with an external sample feeding pipe, the V1 fifth valve port is fixedly communicated with a dosing ring through a pipe fitting, one end of the dosing ring, far away from the V1 fifth valve port, is fixedly communicated with the V1 second valve port through a pipe fitting, the V1 third valve port is fixedly communicated with a V2 second valve port plug through a pipe fitting, the V2 third valve port is installed on the V1, the, the fourth valve port of the V2 is fixedly communicated with a vacuum gauge through a pipe fitting, one end of the vacuum gauge, far away from the fourth valve port of the V2, is fixedly communicated with a vacuum pump through a pipe fitting, one end of the vacuum pump, far away from the vacuum gauge, is fixedly connected with a vent pipeline, and the first valve port of the V2 is fixedly communicated with an external chromatographic column through a pipe fitting.
2. An online high vacuum negative pressure gas sampling method is characterized in that: the method comprises the following steps:
1) negative pressure is pumped in the quantitative ring to ensure that the inner part of the quantitative ring is in a vacuum state;
2) after the quantitative ring is vacuumized, an operator controls the quantitative ring to be communicated with a sample inlet, and the quantitative ring performs negative pressure sample injection;
3) after the quantitative loop sample injection is completed, an operator controls the quantitative loop to be communicated with a carrier gas path, and a sample enters an external chromatographic column for analysis along with carrier gas.
3. The on-line high-vacuum negative-pressure gas sampling method according to claim 2, characterized in that: the step 1) specifically comprises the following steps:
a) an operator closes the six-way valve V1, closes the six-way valve V2, and at the moment, the plug, the V2 third valve port, the V2 second valve port, the V1 third valve port, the V1 second valve port, the dosing ring, the V1 fifth valve port, the V1 fourth valve port, the V2 fifth valve port, the V2 fourth valve port, the vacuum gauge and the vacuum pump are communicated in sequence to form a passage;
b) the operator opens the vacuum pump to start pumping the quantitative ring negative pressure, and waits for the vacuum count value to reach 1 × 10-1When Pa is needed, the system reaches a vacuum state, and the quantitative circular pumping negative pressure is completed.
4. The on-line high-vacuum negative-pressure gas sampling system and method according to claim 2, characterized in that: the step 2) comprises the following steps:
an operator opens the six-way valve V1, the six-way valve V2 is kept closed continuously, at the moment, the sample feeding pipe, the V1 sixth valve port, the V1 first valve port and the quantitative ring are communicated in sequence to form a passage, and a sample enters the quantitative ring from the sample feeding pipe by utilizing pressure difference.
5. The on-line high-vacuum negative-pressure gas sampling method according to claim 2, characterized in that: the step 3): an operator controls the six-way valve V1 to be closed, the six-way valve V2 is opened, at the moment, an external carrier gas pipeline, a V2 sixth valve port, a V2 fifth valve port, a V1 fourth valve port, a V1 fifth valve port, a quantitative ring, a V1 second valve port, a V1 third valve port, a V2 second valve port, a V2 first valve port and an external chromatographic column are communicated in sequence to form a passage, carrier gas enters a system from the external carrier gas pipeline, a sample in the quantitative ring is sent into the external chromatographic column, sample introduction is completed, and the chromatographic column performs sample analysis.
6. The on-line high-vacuum negative-pressure gas sampling method according to claim 4, characterized in that: in the process of opening the six-way valve V1, the vacuum pump is always in the on state.
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| US20180299414A1 (en) * | 2015-10-06 | 2018-10-18 | Lg Chem, Ltd. | Gas sample injection device for gas chromatographic analysis, and method thereof |
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Application publication date: 20200605 |