CN114942163A - Online gas sampling system suitable for multiple catalysis - Google Patents
Online gas sampling system suitable for multiple catalysis Download PDFInfo
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- CN114942163A CN114942163A CN202210433910.3A CN202210433910A CN114942163A CN 114942163 A CN114942163 A CN 114942163A CN 202210433910 A CN202210433910 A CN 202210433910A CN 114942163 A CN114942163 A CN 114942163A
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- 238000005070 sampling Methods 0.000 title claims abstract description 89
- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 30
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims description 11
- 239000002274 desiccant Substances 0.000 claims description 7
- 239000010963 304 stainless steel Substances 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 17
- 238000004140 cleaning Methods 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000011010 flushing procedure Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 124
- 238000010586 diagram Methods 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000012546 transfer Methods 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0323—Arrangements specially designed for simultaneous and parallel cleaning of a plurality of conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0325—Control mechanisms therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an on-line gas sampling system suitable for multiple catalysis, which comprises a pressure stabilizing valve, a gas path, a circulating pump, a main control electromagnetic valve, a three-way valve, a four-way valve, a quantitative ring and a gas sampling needle, wherein the gas path is sequentially connected with the pressure stabilizing valve, the three-way valve, the main control electromagnetic valve, the circulating pump, the four-way valve, the quantitative ring and the gas sampling needle; the three-way valve comprises a first three-way valve, a second three-way valve and a third three-way valve. According to the invention, through the matching of the main control parts, the functions of gas path self-cleaning, gas flushing in the reaction container, automatic quantitative sampling of gas in various catalysis processes, and online sample sending and testing after connection of a gas chromatograph are realized, the high loss of manual sampling products and inaccurate test results are avoided, and the application range of catalytic reaction is expanded and the gas tightness maintenance is avoided.
Description
Technical Field
The invention relates to the field of gas sampling, in particular to an online gas sampling system suitable for multiple catalysis.
Background
Energy is a topic commonly spoken by the old, the main energy structure of China still takes fossil fuel as the main part, and China is the biggest carbon dioxide emitting country in the world. In order to respond to the national call and realize the double-carbon target of carbon peak-reaching carbon neutralization, the method has a great prospect by utilizing various catalytic technologies, such as electrocatalysis, photocatalysis, thermocatalysis and piezoelectric catalysis, and the novel catalysis coupled with the electrocatalysis to convert carbon dioxide into high-added-value products or generate hydrogen to replace the traditional fossil fuel. For these catalytic reaction studies, accurate measurement of the gaseous product is critical.
One of the key steps in measuring gas is the transfer of the gas to be measured. At present, there are two main ways for transferring the gas to be measured: firstly, the original manual needle insertion sampling can cause inevitable product loss in the process, so that the performance is distorted. Secondly, negative pressure sampling, which generally adopts a glass pipeline as a gas path, needs to be connected with a specially-made reaction container, is only suitable for extremely individual catalytic reaction, has a small application range, cannot meet the new trend of the future research, and especially aims at piezoelectric catalysis and other coupled novel catalysis. In addition, the negative pressure sampling mode and the air tightness are a great challenge, and the risk of frequent maintenance is faced, and if the maintenance is not good, the air tightness is poor, and the accuracy of the test result is affected.
Disclosure of Invention
The present invention is directed to solving the above problems by providing an online gas sampling system suitable for use in a variety of catalysis.
The invention realizes the purpose through the following technical scheme:
an on-line gas sampling system suitable for multiple catalysis comprises a pressure stabilizing valve, a gas circuit, a circulating pump, a main control electromagnetic valve, a three-way valve, a four-way valve, a quantitative ring and a gas sampling needle, wherein the gas circuit is sequentially connected with the pressure stabilizing valve, the three-way valve, the main control electromagnetic valve, the circulating pump, the four-way valve, the quantitative ring and the gas sampling needle; the three-way valves comprise a first three-way valve, a second three-way valve and a third three-way valve, the main control solenoid valve comprises a first main control solenoid valve, a second main control solenoid valve, a third main control solenoid valve, a fourth main control solenoid valve, a fifth main control solenoid valve, a sixth main control solenoid valve, a seventh main control solenoid valve and an eighth main control solenoid valve, and the gas sampling needle comprises a first gas sampling needle, a second gas sampling needle and a third gas sampling needle;
one end of a pressure stabilizing valve is connected with an external air source, the other end of the pressure stabilizing valve is connected with a first interface of a first three-way valve, a second interface and a third interface of the first three-way valve are respectively connected with air inlet ends of a first main control electromagnetic valve and a sixth main control electromagnetic valve, an air outlet end of the first main control electromagnetic valve is connected with a first interface of a four-way valve through an air passage, a second interface, a third interface and a fourth interface of the four-way valve are respectively connected with an air inlet end of the second main control electromagnetic valve, an air outlet end of the third main control electromagnetic valve and an air inlet end of the eighth main control electromagnetic valve through the air passage, the air outlet end of the second main control electromagnetic valve is connected with the air passage, the air inlet end of the third main control electromagnetic valve is connected with one end of a first gas sampling needle through the air passage, and the other end of the first gas sampling needle is connected with a catalytic reaction container;
the gas outlet end of the eighth main control electromagnetic valve is connected with the gas inlet end of the circulating pump through a gas circuit, the gas outlet end of the circulating pump is connected with the gas inlet end of the seventh main control electromagnetic valve through a gas circuit, the gas outlet end of the seventh main control electromagnetic valve is connected with the second interface of the third three-way valve through a gas circuit, the first interface and the third interface of the third three-way valve are respectively connected with the gas outlet end of the sixth main control electromagnetic valve and one end of the quantitative ring through a gas circuit, the other end of the quantitative ring is connected with the second interface of the second three-way valve through a gas circuit, the first interface and the third interface of the second three-way valve are respectively connected with the gas inlet end of the fifth main control electromagnetic valve and the gas inlet end of the fourth main control electromagnetic valve through a gas circuit, the gas outlet end of the fifth main control electromagnetic valve is connected with one end of a second gas sampling needle through a gas circuit, the other end of the second main control gas sampling needle is connected with a catalytic reaction container, the gas outlet end of the fourth main control electromagnetic valve is connected with one end of a third gas sampling needle through a gas circuit, the other end of the third gas sampling needle is connected with the gas chromatograph.
Further: the material of the gas path is any one of polyurethane, polyamide, polytetrafluoroethylene and 304 stainless steel.
Further: the pressure stabilizing valve is a precise air pressure regulating valve with continuously adjustable air pressure of 0-0.6 MPa.
Further: the circulating pump is a diaphragm pump, and the volume of the working chamber is changed based on the back-and-forth movement of the diaphragm, so that gas is circulated, and meanwhile, the gas is prevented from being polluted by contacting with the outside air.
Further: the material of the quantitative ring is any one of polyurethane, polyamide, polytetrafluoroethylene and 304 stainless steel.
Further: the gas sampling needle comprises an internal thread needle head, a filter screen, a stud, a drying agent and a quick plug, wherein one end of the stud is connected with the quick plug, the other end of the stud is connected with the internal thread needle head, and the filter screen is installed in the stud.
Further, the method comprises the following steps: the filter screens are arranged at two positions at intervals, and drying agents are filled between the filter screens.
The invention relates to an on-line gas sampling system suitable for multiple catalysis.A pressure stabilizing valve is connected with an external gas source to provide carrier gas with proper pressure for the system, and before a gas sampling needle is connected with reaction vessels of various catalysis or gas chromatography, all gas paths, main control electromagnetic valves and quantitative rings can be cleaned by the carrier gas by controlling the opening of corresponding main control electromagnetic valves and circulating pumps;
after the process of cleaning the internal pipeline, the gas sampling needle is connected with various catalytic reaction containers and gas chromatography; by controlling the opening of the corresponding main control electromagnetic valve, various catalytic reaction containers can be inflated by utilizing carrier gas, and the process is defined as cleaning an external pipeline;
after the process of cleaning the internal pipeline and the process of cleaning the external pipeline are carried out, before the gas to be detected is sampled, the gas to be detected in various catalytic reaction containers can flow in a circulating manner in the quantitative ring all the time by controlling the opening of the corresponding main control electromagnetic valve and the circulating pump, so that the gas to be detected in the quantitative ring is kept in a fresh state all the time; when the sampled gas to be tested needs to be tested, the corresponding main control electromagnetic valve is controlled to be opened, the gas to be tested in the quantitative ring is sent to the gas chromatograph by using carrier gas, meanwhile, the system sends a command to the gas chromatograph, the gas chromatograph starts to automatically record data, and the process is defined as sampling test.
Compared with the prior art, the invention has the following beneficial effects:
the volume of the gas to be measured is accurately quantified through a quantifying ring, so that the consistent amount of the gas to be measured is ensured each time; meanwhile, gas path self-cleaning, gas flushing in a reaction container, automatic quantitative sampling of gas in various catalysis processes, and online sample sending test after connection with a gas chromatograph are realized, so that the problem of high loss caused by contact between the gas to be measured and air is avoided, and high-precision measurement is realized; compared with negative pressure sampling, the gas sampling needle with the superfine needle point is connected with the reaction container, no specific requirement is required on the shape of the reaction container, a user can select any reaction container to perform various catalytic researches, maintenance is not needed, and the problem of air tightness is not worried.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an on-line gas sampling system suitable for use with multiple catalysts according to the present invention;
FIG. 2 is a schematic diagram of a master control solenoid valve for use in a multi-catalytic online gas sampling system according to the present invention;
FIG. 3 is a schematic diagram of a three-way valve suitable for use in a multi-catalytic online gas sampling system according to the present invention;
FIG. 4 is a schematic diagram of a four-way valve suitable for use in a multi-catalytic online gas sampling system according to the present invention;
FIG. 5 is a schematic diagram of a gas sampling probe suitable for use in a multi-catalytic online gas sampling system according to the present invention;
FIG. 6 is a schematic diagram of a first stage of an internal cleaning process for an on-line gas sampling system suitable for use with multiple catalysts according to the present invention;
FIG. 7 is a schematic diagram of a second stage of an internal cleaning process for an on-line gas sampling system suitable for use with multiple catalysts according to the present invention;
FIG. 8 is a schematic diagram of a third stage of an internal cleaning process for an in-line gas sampling system suitable for use with multiple catalysts in accordance with the present invention;
FIG. 9 is a schematic diagram of an external purge process for an in-line gas sampling system suitable for use with multiple catalysis according to the present disclosure;
FIG. 10 is a schematic diagram of a first stage of sampling testing for an in-line gas sampling system suitable for use with multiple catalysts according to the present invention;
FIG. 11 is a schematic diagram of a second stage of sampling testing for an in-line gas sampling system suitable for multiple catalysis according to the present invention.
The reference numerals are explained below:
1. a pressure maintaining valve; 2. a gas path; 3. a circulation pump; 4. a master control electromagnetic valve; 401. a first master control solenoid valve; 402. a second master control solenoid valve; 403. a third master control solenoid valve; 404. a fourth master control solenoid valve; 405. a fifth master control electromagnetic valve; 406. a sixth master control solenoid valve; 407. a seventh master control solenoid valve; 408. an eighth master control electromagnetic valve; 5. a three-way valve; 501. a first three-way valve; 502. a second three-way valve; 503. a third three-way valve; 6. a four-way valve; 7. a dosing ring; 8. a gas sampling needle; 801. a first gas sampling needle; 802. a second gas sampling needle; 803. a third gas sampling needle; 81. an internal threaded needle; 82. filtering with a screen; 83. a stud; 84. a desiccant; 85. and (5) quickly plugging a plug.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1-5, an on-line gas sampling system suitable for multiple catalysis comprises a pressure stabilizing valve 1, a gas path 2, a circulating pump 3, a main control solenoid valve 4, a three-way valve 5, a four-way valve 6, a quantitative ring 7 and a gas sampling needle 8, wherein the gas path 2 is sequentially connected with the pressure stabilizing valve 1, the three-way valve 5, the main control solenoid valve 4, the circulating pump 3, the four-way valve 6, the quantitative ring 7 and the gas sampling needle 8; the three-way valve 5 comprises a first three-way valve 501, a second three-way valve 502 and a third three-way valve 503, the main control solenoid valve 4 comprises a first main control solenoid valve 401, a second main control solenoid valve 402, a third main control solenoid valve 403, a fourth main control solenoid valve 404, a fifth main control solenoid valve 405, a sixth main control solenoid valve 406, a seventh main control solenoid valve 407 and an eighth main control solenoid valve 408, and the gas sampling needle 8 comprises a first gas sampling needle 801, a second gas sampling needle 802 and a third gas sampling needle 803;
one end of a pressure stabilizing valve 1 is connected with an external air source, the other end of the pressure stabilizing valve is connected with a first interface of a first three-way valve 501, a second interface and a third interface of the first three-way valve 501 are respectively connected with air inlet ends of a first main control electromagnetic valve 401 and a sixth main control electromagnetic valve 406, an air outlet end of the first main control electromagnetic valve 401 is connected with a first interface of a four-way valve 6 through an air passage 2, a second interface, a third interface and a fourth interface of the four-way valve 6 are respectively connected with an air inlet end of a second main control electromagnetic valve 402, an air outlet end of a third main control electromagnetic valve 403 and an air inlet end of an eighth main control electromagnetic valve 408 through an air passage 2, an air outlet end of the second main control electromagnetic valve 402 is connected with the air passage 2, an air inlet end of the third main control electromagnetic valve 403 is connected with one end of a first gas sampling needle 801 through the air passage 2, and the other end of the first gas sampling needle 801 is connected with a catalytic reaction container;
the air outlet end of the eighth main control electromagnetic valve 408 is connected with the air inlet end of the circulating pump 3 through an air path 2, the air outlet end of the circulating pump 3 is connected with the air inlet end of the seventh main control electromagnetic valve 407 through an air path 2, the air outlet end of the seventh main control electromagnetic valve 407 is connected with the second interface of the third three-way valve 503 through an air path 2, the first interface and the third interface of the third three-way valve 503 are respectively connected with the air outlet end of the sixth main control electromagnetic valve 406 and one end of the quantitative ring 7 through an air path 2, the other end of the quantitative ring 7 is connected with the second interface of the second three-way valve 502 through an air path 2, the first interface and the third interface of the second three-way valve 502 are respectively connected with the air inlet end of the fifth main control electromagnetic valve 405 and the air inlet end of the fourth main control electromagnetic valve 404 through an air path 2, the air outlet end of the fifth main control electromagnetic valve 405 is connected with one end of a second gas sampling needle 802 through an air path 2, and the other end of the second gas sampling needle 802 is connected with the catalytic reaction container, the gas outlet end of the fourth master control electromagnetic valve 404 is connected with one end of a third gas sampling needle 803 through a gas path 2, and the other end of the third gas sampling needle 803 is connected with the gas chromatograph.
In this embodiment: the pressure stabilizing valve 1 is a precision air pressure regulating valve with the air pressure being continuously adjustable at 0-0.6 MPa; the circulating pump 3 is a diaphragm pump, and the volume of the working chamber is changed based on the back-and-forth movement of the diaphragm so as to circulate the gas and avoid the pollution caused by the contact with the outside air; the gas sampling needle 8 comprises an internal thread needle 81, a filter screen 82, a stud 83, a drying agent 84 and a quick plug 85, one end of the stud 83 is connected with the quick plug 85, the other end of the stud 83 is connected with the internal thread needle 81, the filter screen 82 is installed in the stud 83, the filter screens 82 are arranged at two positions at intervals, and the drying agent 84 is filled between the filter screens 82.
The working principle and the using process of the invention are as follows:
and (3) cleaning an internal pipeline: the first gas sampling needle 801 and the second gas sampling needle 802 are disconnected from the reaction vessel; the first stage is as follows: a first main control electromagnetic valve 401, a second main control electromagnetic valve 402 and a third main control electromagnetic valve 403 are opened, and an external air source is used for cleaning the air path 2 (thick black mark) communicated as shown in fig. 6; and a second stage: the second main control electromagnetic valve 402 and the third main control electromagnetic valve 403 are closed, the eighth main control electromagnetic valve 408, the circulating pump 3, the seventh main control electromagnetic valve 407, the fifth main control electromagnetic valve 405 and the fourth main control electromagnetic valve 404 are opened, and the gas circuit 2 (thick black mark) communicated as shown in fig. 7 is cleaned by using an external gas source; and a third stage: the first main control solenoid valve 401, the eighth main control solenoid valve 408, the circulation pump 3, and the seventh main control solenoid valve 407 are closed, the sixth main control solenoid valve 406 is opened, and the gas path 2 (marked with thick black) communicated as shown in fig. 8 is cleaned by an external gas source. After the third stage, the sixth main control electromagnetic valve 406, the fifth main control electromagnetic valve 405, and the fourth main control electromagnetic valve 404 are closed, and the process of cleaning the internal pipeline is finished.
And (3) cleaning an external pipeline: the first gas sampling needle 801 and the second gas sampling needle 802 are connected with the reaction vessel; the sixth master control solenoid valve 406, the fifth master control solenoid valve 405, the third master control solenoid valve 403, and the second master control solenoid valve 402 are opened, and the gas cleaning of the external reaction vessel is completed by using an external gas source along the gas path 2 (thick black mark) communicated as shown in fig. 9; the sixth, fifth, third, and second master solenoid valves 406, 405, 403, 402 are then closed.
Sampling and testing processes: the first gas sampling needle 801 and the second gas sampling needle 802 are connected with the reaction vessel, and the third gas sampling needle 803 is connected with the gas chromatograph; the first stage is as follows: the third main control electromagnetic valve 403, the eighth main control electromagnetic valve 408, the circulating pump 3, the seventh main control electromagnetic valve 407 and the fifth main control electromagnetic valve 405 are opened, and the gas to be detected in the reaction vessel is enabled to completely fill the quantitative ring 7 according to the gas path (thick black mark) communicated as shown in fig. 10 through the action of the circulating pump 3; and a second stage: the third main control electromagnetic valve 403, the eighth main control electromagnetic valve 408, the circulation pump 3, the seventh main control electromagnetic valve 407, and the fifth main control electromagnetic valve 405 are closed, the sixth main control electromagnetic valve 406, and the fourth main control electromagnetic valve 404 are opened, and the gas to be tested in the quantitative ring 7 is sent to the gas chromatography test by using an external gas source according to the gas path (thick black mark) communicated as shown in fig. 11.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. 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.
Claims (7)
1. An online gas sampling system suitable for multiple catalysis which characterized in that: the gas sampling device comprises a pressure stabilizing valve (1), a gas circuit (2), a circulating pump (3), a main control electromagnetic valve (4), a three-way valve (5), a four-way valve (6), a quantitative ring (7) and a gas sampling needle (8), wherein the gas circuit (2) is sequentially connected with the pressure stabilizing valve (1), the three-way valve (5), the main control electromagnetic valve (4), the circulating pump (3), the four-way valve (6), the quantitative ring (7) and the gas sampling needle (8); the three-way valve (5) comprises a first three-way valve (501), a second three-way valve (502) and a third three-way valve (503), the main control electromagnetic valve (4) comprises a first main control electromagnetic valve (401), a second main control electromagnetic valve (402), a third main control electromagnetic valve (403), a fourth main control electromagnetic valve (404), a fifth main control electromagnetic valve (405), a sixth main control electromagnetic valve (406), a seventh main control electromagnetic valve (407) and an eighth main control electromagnetic valve (408), and the gas sampling needle (8) comprises a first gas sampling needle (801), a second gas sampling needle (802) and a third gas sampling needle (803);
one end of the pressure stabilizing valve (1) is connected with an external air source, the other end of the pressure stabilizing valve is connected with a first interface of a first three-way valve (501), a second interface and a third interface of the first three-way valve (501) are respectively connected with air inlet ends of a first main control electromagnetic valve (401) and a sixth main control electromagnetic valve (406), an air outlet end of the first main control electromagnetic valve (401) is connected with a first interface of a four-way valve (6) through an air passage (2), and a second interface and a third interface of the four-way valve (6), the fourth interface is respectively connected with the air inlet end of a second main control electromagnetic valve (402), the air outlet end of a third main control electromagnetic valve (403) and the air inlet end of an eighth main control electromagnetic valve (408) through an air passage (2), the air outlet end of the second main control electromagnetic valve (402) is connected with the air passage (2), the air inlet end of the third main control electromagnetic valve (403) is connected with one end of a first gas sampling needle (801) through the air passage (2), and the other end of the first gas sampling needle (801) is connected with a catalytic reaction container;
the air outlet end of the eighth main control electromagnetic valve (408) is connected with the air inlet end of the circulating pump (3) through an air passage (2), the air outlet end of the circulating pump (3) is connected with the air inlet end of the seventh main control electromagnetic valve (407) through the air passage (2), the air outlet end of the seventh main control electromagnetic valve (407) is connected with the second interface of the third three-way valve (503) through the air passage (2), the first interface and the third interface of the third three-way valve (503) are respectively connected with the air outlet end of the sixth main control electromagnetic valve (406) and one end of the quantitative ring (7) through the air passage (2), the other end of the quantitative ring (7) is connected with the second interface of the second three-way valve (502) through the air passage (2), the first interface and the third interface of the second three-way valve (502) are respectively connected with the air inlet end of the fifth main control electromagnetic valve (405) and the air inlet end of the fourth main control electromagnetic valve (404) through the air passage (2), the air outlet end of the fifth main control electromagnetic valve (405) is connected with one end of the second gas sampling needle (802) through the air passage (2), the other end of the second gas sampling needle (802) is connected with a catalytic reaction container, the gas outlet end of the fourth master control electromagnetic valve (404) is connected with one end of a third gas sampling needle (803) through a gas circuit (2), and the other end of the third gas sampling needle (803) is connected with a gas chromatograph.
2. The system of claim 1, wherein the system is adapted for use with multiple catalysts, and further comprising: the material of the gas circuit (2) is any one of polyurethane, polyamide, polytetrafluoroethylene and 304 stainless steel.
3. The system of claim 1, wherein the system is adapted for use with multiple catalysts, and further comprising: the pressure stabilizing valve (1) is a precise air pressure regulating valve with continuously adjustable air pressure of 0-0.6 MPa.
4. The system of claim 1, wherein the system is adapted for use with multiple catalysts, and further comprising: the circulating pump (3) is a diaphragm pump.
5. The system of claim 1, wherein the system is adapted for use with multiple catalysts, and further comprising: the material of the quantitative ring (7) is any one of polyurethane, polyamide, polytetrafluoroethylene and 304 stainless steel.
6. The system of claim 1, wherein the system is adapted for use with multiple catalysts, and further comprising: the gas sampling needle (8) comprises an internal thread needle head (81), a filter screen (82), a stud (83), a drying agent (84) and a quick plug (85), one end of the stud (83) is connected with the quick plug (85), the other end of the stud (83) is connected with the internal thread needle head (81), and the filter screen (82) is installed in the stud (83).
7. The system of claim 6, wherein the system is adapted for use with multiple catalysts, and further comprising: the filter screens (82) are arranged at two positions at intervals, and drying agents (84) are filled between the filter screens (82).
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| CN214122131U (en) * | 2020-11-11 | 2021-09-03 | 郑州克莱克特科学仪器有限公司 | Full-automatic multi-channel needle type gas sample injection device |
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