CN114942163B - Online gas sampling system suitable for multiple catalysis - Google Patents
Online gas sampling system suitable for multiple catalysis Download PDFInfo
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- CN114942163B CN114942163B CN202210433910.3A CN202210433910A CN114942163B CN 114942163 B CN114942163 B CN 114942163B CN 202210433910 A CN202210433910 A CN 202210433910A CN 114942163 B CN114942163 B CN 114942163B
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- 238000005070 sampling Methods 0.000 title claims abstract description 90
- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 40
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 19
- 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
- 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
- 239000007789 gas Substances 0.000 abstract description 125
- 238000000034 method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 17
- 238000004140 cleaning Methods 0.000 abstract description 15
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000011010 flushing procedure Methods 0.000 abstract description 2
- 238000004817 gas chromatography Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 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
- 239000000463 material Substances 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
- 239000002803 fossil fuel Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process 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
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
-
- 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)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an online gas sampling system suitable for multiple catalysis, which 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 valve comprises a first three-way valve, a second three-way valve and a third three-way valve. According to the invention, through the cooperation of all the main control components, the functions of self-cleaning of a gas path, gas flushing in a reaction container, automatic quantitative sampling of gases in various catalytic processes and on-line sample feeding test after connecting gas chromatography are realized, the problems of high loss of manual sampling products and inaccurate test results are avoided, and meanwhile, the application range of catalytic reaction is enlarged 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 of old life, the main energy structure of China still takes fossil fuel as the main material, and China is the largest carbon dioxide emission country in the world. In order to respond to the national call, the double-carbon target of carbon peak carbon neutralization is realized, and the mode of converting carbon dioxide into high-added-value products or generating hydrogen to replace the traditional fossil fuel by utilizing various catalytic technologies such as electrocatalysis, photocatalysis, thermocatalysis, piezocatalysis and novel catalysis of coupling of the catalysis is quite promising. For these catalytic reaction studies, accurate measurement of gaseous products is of paramount importance.
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 unavoidable product loss in the process, so that the performance is distorted. Secondly, negative pressure sampling is usually carried out by adopting a glass pipeline as a gas path, and a special reaction container is required to be connected, so that the method is only suitable for extremely individual catalytic reaction, has a small application range, cannot meet new trends of daily and lunar researches, and is especially suitable for piezoelectric catalysis and other coupled novel catalysis. In addition, the negative pressure sampling mode, the air tightness is a great challenge, and risks of frequent maintenance are faced, if the maintenance is poor, the air tightness is poor, and the accuracy of a test result is affected.
Disclosure of Invention
The present invention aims to solve the above problems by providing an on-line gas sampling system suitable for various catalysis.
The invention realizes the above purpose through the following technical scheme:
An online 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 valve comprises a first three-way valve, a second three-way valve and a third three-way valve, the main control electromagnetic valve comprises a first main control electromagnetic valve, a second main control electromagnetic valve, a third main control electromagnetic valve, a fourth main control electromagnetic valve, a fifth main control electromagnetic valve, a sixth main control electromagnetic valve, a seventh main control electromagnetic valve and an eighth main control electromagnetic 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 the 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 path, 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 an eighth main control electromagnetic valve through an air path, an air outlet end of the second main control electromagnetic valve is connected with an air path, an air inlet end of the third main control electromagnetic valve is connected with one end of a first gas sampling needle through an air path, 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 port of the third three-way valve through a gas circuit, the first port and the third port 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 port of the second three-way valve through a gas circuit, the first port and the third port 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 the second gas sampling needle through a gas circuit, the other end of the second gas sampling needle is connected with a catalytic reaction container, and the gas outlet end of the fourth main control electromagnetic valve is connected with one end of the third gas sampling needle through a gas circuit.
Further: the air path material is any one of polyurethane, polyamide, polytetrafluoroethylene and 304 stainless steel.
Further: the pressure stabilizing valve is a precise air pressure regulating valve with air pressure of 0-0.6MPa and continuously adjustable.
Further: the circulating pump is a diaphragm pump, and changes the volume of the working chamber based on the back and forth movement of the diaphragm, so that gas circulates, and meanwhile, the pollution caused by contact with the outside air is avoided.
Further: the quantitative ring material 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 arranged in the stud.
Further: the filter screens are arranged at two positions at intervals, and the drying agent is filled between the filter screens.
The invention relates to an online gas sampling system suitable for multiple catalysis, which is characterized in that an external gas source is connected with a pressure stabilizing valve to provide carrier gas with proper pressure for the system, and before a gas sampling needle is connected with various catalytic reaction containers or gas chromatographs, the opening of a corresponding main control electromagnetic valve and a circulating pump can be controlled, and all gas paths, main control electromagnetic valves and quantitative rings are cleaned by the carrier gas, wherein the process is defined as cleaning internal pipelines;
After the process of cleaning the internal pipeline, the gas sampling needle is connected with various catalytic reaction vessels and gas chromatography; by controlling the opening of the corresponding main control electromagnetic valve, various catalytic reaction containers can be inflated by carrier gas, and the process is defined as cleaning the external pipeline;
After the process of cleaning the internal pipeline and the process of cleaning the external pipeline, before the sampling of the gas to be detected is started, the gas to be detected in various catalytic reaction containers can always circularly flow in the quantifying ring by controlling the opening of the corresponding main control electromagnetic valve and the circulating pump, and the gas to be detected in the quantifying ring is kept in a fresh state all the time; when the sampled gas to be tested is required to be tested, the gas to be tested in the quantitative ring is sent to the gas chromatograph by using carrier gas by controlling the opening of the corresponding main control electromagnetic valve, meanwhile, the system sends a command to the gas chromatograph, and the gas chromatograph starts to automatically record data, and the process is defined as the 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 the quantifying ring, so that the consistent quantity of the gas to be measured each time is ensured; meanwhile, the self-cleaning of the gas path, the gas flushing in the reaction vessel, the automatic quantitative sampling of the gas in various catalytic processes and the on-line sample feeding test after the gas chromatograph is connected are realized, the problem of high loss caused by the contact of the gas to be tested and the air is avoided, and the 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 provided for 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 invention or the technical solutions of the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of an on-line gas sampling system suitable for multiple catalysis in accordance with the present invention;
FIG. 2 is a schematic diagram of a master control solenoid valve suitable for use in a multi-catalytic on-line 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 on-line gas sampling system according to the present invention;
FIG. 4 is a schematic diagram of a four-way valve suitable for use in an on-line gas sampling system with multiple catalysis according to the present invention;
FIG. 5 is a schematic view of a gas sampling needle suitable for use in an on-line gas sampling system with multiple catalysis in accordance with the present invention;
FIG. 6 is a schematic illustration of a first stage of an in-line gas sampling system internal cleaning process suitable for multiple catalysis in accordance with the present invention;
FIG. 7 is a schematic illustration of a second stage of an internal cleaning process of an in-line gas sampling system adapted for multiple catalysis in accordance with the present invention;
FIG. 8 is a schematic illustration of a third stage of an in-line gas sampling system internal cleaning process suitable for multiple catalysis in accordance with the present invention;
FIG. 9 is a schematic illustration of an external cleaning process for an on-line gas sampling system adapted for multiple catalysis in accordance with the present invention;
FIG. 10 is a schematic diagram of a first stage of a sample test of an on-line gas sampling system suitable for multiple catalysis in accordance with the present invention;
FIG. 11 is a schematic diagram of a second stage of sample testing of an on-line gas sampling system suitable for multiple catalysis in accordance with the present invention.
The reference numerals are explained as follows:
1. a pressure stabilizing valve; 2. an air path; 3. a circulation pump; 4. a main control electromagnetic valve; 401. a first main control electromagnetic valve; 402. a second main control electromagnetic valve; 403. a third main control electromagnetic valve; 404. a fourth main control electromagnetic valve; 405. a fifth main 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 internally threaded needle; 82. a filter screen; 83. a stud; 84. a drying agent; 85. and (5) quickly inserting a plug.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication 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 in a specific case.
The invention is further described below with reference to the accompanying drawings:
As shown in fig. 1-5, an online gas sampling system suitable for multiple catalysis 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 the 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 the first main control electromagnetic valve 401 and the 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 the four-way valve 6 through an air channel 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 the second main control electromagnetic valve 402, an air outlet end of the third main control electromagnetic valve 403 and an air inlet end of the eighth main control electromagnetic valve 408 through the air channel 2, an air outlet end of the second main control electromagnetic valve 402 is connected with the air channel 2, an air inlet end of the third main control electromagnetic valve 403 is connected with one end of the first air sampling needle 801 through the air channel 2, and the other end of the first air 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 channel 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 channel 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 channel 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 quantifying ring 7 through the air channel 2, the other end of the quantifying ring 7 is connected with the second interface of the second three-way valve 502 through the air channel 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 channel 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 channel 2, the other end of the second gas sampling needle 802 is connected with a catalytic reaction container, and the air outlet end of the fourth main control electromagnetic valve 404 is connected with the third gas chromatographic needle 803.
In this embodiment: the pressure stabilizing valve 1 is a precise air pressure regulating valve with the air pressure of 0-0.6MPa continuously adjustable; the circulating pump 3 is a diaphragm pump, and changes the volume of the working chamber based on the back and forth movement of the diaphragm so as to circulate gas, and meanwhile, the pollution caused by contact with the outside air is avoided; 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, wherein 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, two filter screens 82 are arranged at intervals, and the drying agent 84 is filled between the filter screens 82.
The working principle and the use flow of the invention are as follows:
The process of cleaning the internal pipeline comprises the following steps: the first gas sampling needle 801 and the second gas sampling needle 802 are disconnected from the reaction vessel; the first stage: the first main control electromagnetic valve 401, the second main control electromagnetic valve 402 and the third main control electromagnetic valve 403 are opened, and the gas circuit 2 (thick black mark) communicated as shown in fig. 6 is cleaned by an external gas source; 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 an external air source is utilized to clean the air path 2 (thick black mark) which is communicated as shown in fig. 7; and a third stage: the first main control electromagnetic valve 401, the eighth main control electromagnetic valve 408, the circulating pump 3 and the seventh main control electromagnetic valve 407 are closed, the sixth main control electromagnetic valve 406 is opened, and the gas circuit 2 (thick black mark) communicated as shown in fig. 8 is cleaned by an external gas source. After the third stage is finished, 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.
The process of cleaning the external pipeline comprises the following steps: the first gas sampling needle 801 and the second gas sampling needle 802 are connected with the reaction vessel; the sixth main control electromagnetic valve 406, the fifth main control electromagnetic valve 405, the third main control electromagnetic valve 403 and the second main control electromagnetic valve 402 are opened, and the external gas source is utilized to complete the gas cleaning of the external reaction container along the gas path 2 (thick black mark) which is communicated with the external gas source as shown in fig. 9; the sixth master solenoid valve 406, the fifth master solenoid valve 405, the third master solenoid valve 403, the second master solenoid valve 402 are then closed.
Sampling and testing process: the first gas sampling needle 801, 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: 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 container is completely filled with the quantitative ring 7 according to the gas path (thick black mark) communicated with the reaction container as shown in fig. 10 under 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 circulating 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 chromatographic test by using an external gas source according to the gas path (thick black mark) communicated as shown in fig. 11.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (7)
1. An on-line gas sampling system suitable for multiple catalysis, characterized in that: the 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 the 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 the first main control electromagnetic valve (401) and the 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 the four-way valve (6) through an air channel (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 the second main control electromagnetic valve (402), an air outlet end of the third main control electromagnetic valve (403) and an air inlet end of the eighth main control electromagnetic valve (408), the air outlet end of the second main control electromagnetic valve (402) is connected with the air channel (2), the air inlet end of the third main control electromagnetic valve (403) is connected with one end of the first air sampling needle (801) through the air channel (2), and the other end of the first air sampling needle (801) is connected with a catalytic reaction container;
The gas outlet end of the eighth main control electromagnetic valve (408) is connected with the gas inlet end of the circulating pump (3) through a gas path (2), the gas outlet end of the circulating pump (3) is connected with the gas inlet end of the seventh main control electromagnetic valve (407) through the gas path (2), the gas 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 gas path (2), the first interface and the third interface of the third three-way valve (503) are respectively connected with the gas outlet end of the sixth main control electromagnetic valve (406) and one end of the quantifying ring (7) through the gas path (2), the other end of the quantifying ring (7) is connected with the second interface of the second three-way valve (502) through the gas path (2), the first interface and the third interface of the second three-way valve (502) are respectively connected with the gas inlet end of the fifth main control electromagnetic valve (405) through the gas path (2), the gas outlet end of the fifth main control electromagnetic valve (405) is connected with one end of the second gas sampling needle (802) through the gas path (2), the other end of the second gas sampling needle (802) is connected with the second gas sampling needle (803) and the third end of the fourth main control electromagnetic valve (404) is connected with the gas sampling needle (803).
2. An on-line gas sampling system for multiple catalysis according to claim 1, wherein: the air path (2) is made of any one of polyurethane, polyamide, polytetrafluoroethylene and 304 stainless steel.
3. An on-line gas sampling system for multiple catalysis according to claim 1, wherein: the pressure stabilizing valve (1) is a precise air pressure regulating valve with air pressure of 0-0.6MPa and continuously adjustable.
4. An on-line gas sampling system for multiple catalysis according to claim 1, wherein: the circulating pump (3) is a diaphragm pump.
5. An on-line gas sampling system for multiple catalysis according to claim 1, wherein: the quantitative ring (7) is made of any one of polyurethane, polyamide, polytetrafluoroethylene and 304 stainless steel.
6. An on-line gas sampling system for multiple catalysis according to claim 1, wherein: 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), wherein 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 arranged in the stud (83).
7. An on-line gas sampling system for multiple catalysis according to claim 6, wherein: two filter screens (82) are arranged at intervals, and a drying agent (84) is filled between the filter screens (82).
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| CN201837540U (en) * | 2010-03-05 | 2011-05-18 | 天华化工机械及自动化研究设计院苏州自动化研究所 | Novel closed sampling device |
| CN112213454A (en) * | 2020-10-30 | 2021-01-12 | 成都昶艾电子科技有限公司 | Pharmaceutical chemical intermediate production process gas analysis pretreatment system |
| 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 |
| CN112526042A (en) * | 2020-11-11 | 2021-03-19 | 郑州克莱克特科学仪器有限公司 | Full-automatic multi-channel needle type gas sampling device and automatic online gas dilution method |
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| Title |
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| 适用于多种催化反应的在线气体取样装置;刘安平;实验技术与管理;20230725;第40卷(第7期);全文 * |
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