CN112731992A - Full-automatic low temperature series valve who sweeps entrapment appearance keeps apart water trap - Google Patents
Full-automatic low temperature series valve who sweeps entrapment appearance keeps apart water trap Download PDFInfo
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- CN112731992A CN112731992A CN202110029517.3A CN202110029517A CN112731992A CN 112731992 A CN112731992 A CN 112731992A CN 202110029517 A CN202110029517 A CN 202110029517A CN 112731992 A CN112731992 A CN 112731992A
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
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Abstract
The invention relates to the technical field of purging and trapping instruments, in particular to a low-temperature series valve isolation dewatering device of a full-automatic purging and trapping instrument, which comprises: the device comprises a water removal pipe, a high-temperature six-way valve, a chromatographic carrier gas device, a GC sample inlet, a low-temperature collection pipe and a sample outlet, wherein six valve ports of the high-temperature six-way valve are sequentially a port 1, a port 2, a port 3, a port 4, a port 5 and a port 6, the port 2 is communicated with the chromatographic carrier gas device, the port 3 is communicated with the GC sample inlet, the port 5 is communicated with the water removal pipe, the port 6 is communicated with the sample outlet, and two ends of the low-temperature collection pipe are respectively communicated with the port 1 and the port 4; the water removal pipe and the low-temperature collecting pipe are both sleeved with temperature changing devices, and the low-temperature collecting pipe is filled with composite VOCs adsorbents. The invention can realize low-temperature capture at the lowest temperature of-40 ℃ and rapid temperature rise at the temperature rise rate of about 3000 ℃/min, has no interference and discrimination effect on the tested VOCS component, and can rapidly remove residual water.
Description
Technical Field
The invention relates to the technical field of blowing and trapping instruments, in particular to a low-temperature series valve isolation dewatering device of a full-automatic blowing and trapping instrument.
Background
The full-automatic purging and trapping instrument is special sample injection equipment for testing the detection of Volatile Organic Compounds (VOCs) in water or soil in domestic and foreign soil environment standards, is used for continuous full-automatic sample injection analysis of sample bottles, and is linked with peripheral gas chromatography and mass spectrometry to realize unattended full-automatic analysis. The working principle of the full-automatic purging and trapping instrument is as follows: continuously passing gas through a sample by utilizing a purging trapping technology, extracting volatile components in the gas, trapping the volatile components in the gas in an adsorbent or a cold trap, and analyzing and determining after switching an analytic valve; a water trap is often required in this process.
The water removing trap in the current market mainly comprises: the adsorbent removes water trap and whirlwind water cooling and removes water trap, and its main influence is that the efficiency of dewatering is not high, and the adsorbent can influence the VOCs adsorption efficiency, brings the discrimination effect to different VOCs, brings cross component interference for the sample moreover easily.
The water removing trap on the market at present has the following specific defects:
(1) disturbance of water
The trap tube contains excess water, which can cause signal distortion, is a common problem with purge trapping. The interference of water causes abnormal peak shape, the recovery rate of the compound purged in the early stage is low, and the service life of the detector is shortened; therefore, whether the influence of the water vapor on the analysis and detection can be reduced is the first question to be considered in selecting the collecting pipe.
(2) Cross contamination
Insufficient concentration or desorption of the sample at the cold spot of the trap results in small portions of the sample remaining to cause cross-contamination, a condition that often results from moisture overload operation of the system.
Disclosure of Invention
In order to solve the above problems, the present invention provides a low-temperature series valve isolation water removal device for a fully automatic purging and trapping instrument, which has a compact structure, can achieve low-temperature trapping at a minimum temperature of-40 ℃ and rapid temperature rise at a temperature rise rate of about 3000 ℃/min, and has no interference or discrimination effect on the measured VOCS components.
The invention further aims to provide a low-temperature series valve isolation water removal device of a full-automatic purging and trapping instrument, which can quickly remove residual moisture, eliminate pipeline blockage and pollution caused by moisture overload and cannot influence the next test.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a water trap is kept apart to full-automatic low temperature series valve who sweeps entrapment appearance, contains: a water removing pipe, a high-temperature six-way valve, a chromatographic carrier gas device, a GC sample inlet, a low-temperature collecting pipe and a sample outlet,
six valve ports of the high-temperature six-way valve are sequentially a port No. 1, a port No. 2, a port No. 3, a port No. 4, a port No. 5 and a port No. 6, the port No. 2 is communicated with the chromatographic carrier gas device, the port No. 3 is communicated with the GC sample inlet, the port No. 5 is communicated with the water removal pipe, the port No. 6 is communicated with the sample outlet, and two ends of the low-temperature collection pipe are respectively communicated with the port No. 1 and the port No. 4;
the water removing pipe and the low-temperature collecting pipe are both sleeved with temperature changing devices, the temperature changing devices are double-channel low-temperature collecting and rapid temperature rising devices, and composite VOCs adsorbents are filled in the low-temperature collecting pipes;
the low-temperature series valve isolation water removal device of the full-automatic purging and trapping instrument further comprises: the device comprises a first purge gas system and a second purge gas system, wherein the first purge gas system is used for introducing purge gas into the water removal pipe, and the second purge gas system is used for introducing back purge gas into the sample outlet.
Further, the high-temperature six-way valve has two states, which are respectively:
the first state: the port 1 is communicated with the port 6, the port 2 is communicated with the port 3, and the port 4 is communicated with the port 5;
and a second state: no. 1 mouth and No. 2 mouth intercommunication, No. 3 mouths and No. 4 mouth intercommunication, No. 5 mouths and No. 6 mouth intercommunication.
Further, in the process of removing water and adsorbing VOCs, the high-temperature six-way valve is switched to the first state, the temperature is set to be in the range of-35 ℃ to-350 ℃ through the temperature changing device, the purging gas rich in water vapor and VOCs is blown into the water removing pipe, and then the purging gas sequentially passes through the water removing pipe, the high-temperature six-way valve, the low-temperature collecting pipe and the high-temperature six-way valve and flows out from the sample outlet; finally, water vapor is condensed in the water removal pipe, and VOCs are enriched in the low-temperature capture pipe.
Further, in the analysis and sample introduction processes, the high-temperature six-way valve is switched to the state two, the temperature in the low-temperature trapping pipe is rapidly raised through the temperature changing device, VOCs enriched in the low-temperature trapping pipe are volatilized, and the VOCs are brought into the GC sample introduction port through chromatographic carrier gas for analysis and detection.
Further, in the processes of back flushing and activation, the high-temperature six-way valve is switched to the first state, the temperature is set to be within the range of 50-400 ℃ through the temperature changing device, back flushing gas is introduced into the sample outlet, and therefore residual VOCs in the low-temperature collecting pipe and water in the water removing pipe are taken out.
The invention has the beneficial effects that:
the invention adopts the water removal pipe, the high-temperature six-way valve, the chromatographic carrier gas device, the GC sample inlet and the low-temperature trapping pipe, has the characteristic of compact structure, can realize low-temperature trapping at the lowest temperature of-40 ℃, effectively condenses water vapor in the water removal pipe and eliminates the interference of water;
the invention adopts a double-channel low-temperature trapping and rapid heating device, can realize rapid heating with the heating rate of about 3000 ℃/min, and improves the working efficiency;
thus, the present invention does not have interference or discrimination effects on the measured VOCS components.
According to the invention, residual moisture is quickly removed through the air return and the heating water removal pipe, pipeline blockage and pollution caused by moisture overload are eliminated, and the next test cannot be influenced.
Drawings
FIG. 1 is a schematic view of the present invention in a capture state.
FIG. 2 is a schematic view of the present invention in a state of analysis and sample injection.
The reference numbers illustrate: 1. a chromatographic carrier gas device; 2. a high temperature six-way valve; 3, a GC sample inlet; 4. a low temperature collection pipe; 5. a water removal pipe; 6. and (4) a sample outlet.
Detailed Description
Referring to fig. 1, the present invention relates to a low temperature serial valve isolation water removal device of a full-automatic purging and trapping instrument, comprising: a water removal pipe 5, a high-temperature six-way valve 2, a chromatogram carrier gas device 1, a GC sample inlet 3, a low-temperature collecting pipe 4 and a sample outlet 6,
six valve ports of the high-temperature six-way valve 2 are sequentially a port 1, a port 2, a port 3, a port 4, a port 5 and a port 6, the port 2 is communicated with the chromatographic carrier gas device 1, the port 3 is communicated with the GC sample inlet 3, the port 5 is communicated with the dewatering pipe 5, the port 6 is communicated with the sample outlet 6, and two ends of the low-temperature collection pipe 4 are respectively communicated with the port 1 and the port 4;
the water removal pipe 5 and the low-temperature collecting pipe 4 are both sleeved with temperature changing devices which are double-channel low-temperature collecting and rapid heating devices (please refer to the patent application number of CN201922024498.6), the double-channel low-temperature collecting and rapid heating devices can realize low-temperature collection at the lowest temperature of-40 ℃ and rapid heating at the heating rate of about 3000 ℃/min, and no condensed water is separated out;
the low-temperature collecting pipe 4 is filled with composite VOCs adsorbent;
the low-temperature series valve isolation water removal device of the full-automatic purging and trapping instrument further comprises: the device comprises a first purge gas system and a second purge gas system, wherein the first purge gas system is used for introducing purge gas into the water removal pipe 5, and the second purge gas system is used for introducing back purge gas into the sample outlet 6; it should be noted that the purge gas and the blowback gas are inert gases (nitrogen), and the purge gas also contains a large amount of water vapor and VOCs.
Further, the high-temperature six-way valve 2 has two states, which are respectively:
the first state: the port 1 is communicated with the port 6, the port 2 is communicated with the port 3, and the port 4 is communicated with the port 5;
and a second state: no. 1 mouth and No. 2 mouth intercommunication, No. 3 mouths and No. 4 mouth intercommunication, No. 5 mouths and No. 6 mouth intercommunication.
In the process of removing water and adsorbing VOCs, the high-temperature six-way valve 2 is switched to the first state, the temperature is set to be in the range of-35 ℃ to-350 ℃ through the temperature changing device, the purging gas rich in water vapor and VOCs is blown into the water removing pipe 5, and then the purging gas sequentially passes through the water removing pipe 5, the high-temperature six-way valve 2, the low-temperature collecting pipe 4 and the high-temperature six-way valve 2 and flows out from the sample outlet 6; finally, water vapor is condensed in the water removal pipe 5, VOCs are enriched in the low-temperature collection pipe 4, and inert gas flows out from the sample outlet 6;
it should be noted that, the water removal pipe 5 is an empty pipe, and in a low temperature state, the water removal pipe 5 can condense water in the purge gas, because the condensation point of the VOCs is much lower than the temperature of the water, the water removal pipe 5 can be rapidly passed through, the low temperature collection pipe 4 is filled with the composite VOCs adsorbent, the VOCs in the purge gas are enriched in the low temperature collection pipe 4, and the inert gas nitrogen and the like flow out from the outlet.
In the analysis and sample injection process (please refer to fig. 2), the high-temperature six-way valve 2 is switched to the second state, the temperature inside the low-temperature collection tube 4 is rapidly raised through the temperature changing device, so that the VOCs enriched in the low-temperature collection tube 4 are volatilized, and the VOCs are carried to the GC sample injection port 3 through chromatographic carrier gas for analysis and detection;
in the scheme, the temperature is rapidly raised according to the set analytic temperature program, three-order temperature analytic sampling can be realized, VOCs enriched in the low-temperature collecting pipe 4 volatilize due to high temperature and become gaseous, and the gaseous VOCs is brought to the GC sampling port 3 through chromatographic carrier gas for analysis and detection.
In the back flushing and activating processes, the high-temperature six-way valve 2 is switched to a first state, the temperature is set to be within the range of 50-400 ℃ through the temperature changing device, back flushing gas is introduced into the sample outlet 6, and therefore residual VOCs in the low-temperature collecting pipe 4 and water in the water removing pipe 5 are taken out;
in the above scheme, through the anti-gas and heating dewatering pipe 5, clear away remaining moisture fast, eliminate pipeline jam and pollution that are brought by moisture overload, can not influence the test next time.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.
Claims (5)
1. The utility model provides a water trap is kept apart to full-automatic low temperature series valve who sweeps entrapment appearance which characterized in that contains: a water removing pipe, a high-temperature six-way valve, a chromatographic carrier gas device, a GC sample inlet, a low-temperature collecting pipe and a sample outlet,
six valve ports of the high-temperature six-way valve are sequentially a port No. 1, a port No. 2, a port No. 3, a port No. 4, a port No. 5 and a port No. 6, the port No. 2 is communicated with the chromatographic carrier gas device, the port No. 3 is communicated with the GC sample inlet, the port No. 5 is communicated with the water removal pipe, the port No. 6 is communicated with the sample outlet, and two ends of the low-temperature collection pipe are respectively communicated with the port No. 1 and the port No. 4;
the water removing pipe and the low-temperature collecting pipe are both sleeved with temperature changing devices, the temperature changing devices are double-channel low-temperature collecting and rapid temperature rising devices, and composite VOCs adsorbents are filled in the low-temperature collecting pipes;
the low-temperature series valve isolation water removal device of the full-automatic purging and trapping instrument further comprises: the device comprises a first purge gas system and a second purge gas system, wherein the first purge gas system is used for introducing purge gas into the water removal pipe, and the second purge gas system is used for introducing back purge gas into the sample outlet.
2. The low-temperature series valve isolation water removal device of the full-automatic purging and trapping instrument as claimed in claim 1, wherein the high-temperature six-way valve has two states, respectively:
the first state: the port 1 is communicated with the port 6, the port 2 is communicated with the port 3, and the port 4 is communicated with the port 5;
and a second state: no. 1 mouth and No. 2 mouth intercommunication, No. 3 mouths and No. 4 mouth intercommunication, No. 5 mouths and No. 6 mouth intercommunication.
3. The low-temperature series valve isolation water removal device of the full-automatic purging and trapping instrument as claimed in claim 2, wherein in the process of removing water and adsorbing VOCs, the high-temperature six-way valve is switched to the state one, the temperature is set to be in the range of-35 ℃ to-350 ℃ through the temperature changing device, purging gas rich in water vapor and VOCs is blown into the water removal pipe, and then the purging gas passes through the water removal pipe, the high-temperature six-way valve, the low-temperature trapping pipe and the high-temperature six-way valve in sequence and flows out from the sample outlet; finally, water vapor is condensed in the water removal pipe, and VOCs are enriched in the low-temperature capture pipe.
4. The device for isolating and dewatering the low-temperature serial valve of the full-automatic purging and trapping instrument according to claim 3, wherein in the analyzing and sampling process, the high-temperature six-way valve is switched to the state two, the temperature inside the low-temperature trapping pipe is rapidly raised through the temperature changing device, so that the VOCs accumulated in the low-temperature trapping pipe are volatilized, and the VOCs are carried to the GC sampling port through chromatographic carrier gas for analysis and detection.
5. The low-temperature series valve isolation and water removal device of the full-automatic purging and trapping instrument as claimed in claim 4, wherein during the back-flushing and activating processes, the high-temperature six-way valve is switched to the first state, the temperature is set to be in the range of 50-400 ℃ through the temperature changing device, and back-flushing gas is introduced into the sample outlet, so that residual VOCs in the low-temperature trapping tube and water in the water removal tube are removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110029517.3A CN112731992A (en) | 2021-01-11 | 2021-01-11 | Full-automatic low temperature series valve who sweeps entrapment appearance keeps apart water trap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110029517.3A CN112731992A (en) | 2021-01-11 | 2021-01-11 | Full-automatic low temperature series valve who sweeps entrapment appearance keeps apart water trap |
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| CN112731992A true CN112731992A (en) | 2021-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110029517.3A Pending CN112731992A (en) | 2021-01-11 | 2021-01-11 | Full-automatic low temperature series valve who sweeps entrapment appearance keeps apart water trap |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115060569A (en) * | 2022-08-17 | 2022-09-16 | 常州磐宇仪器有限公司 | Rapid enrichment system and method for soil VOCs analysis and detection |
| CN115629155A (en) * | 2022-09-09 | 2023-01-20 | 华南理工大学 | Online multi-matrix VOCs analysis device and method |
-
2021
- 2021-01-11 CN CN202110029517.3A patent/CN112731992A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115060569A (en) * | 2022-08-17 | 2022-09-16 | 常州磐宇仪器有限公司 | Rapid enrichment system and method for soil VOCs analysis and detection |
| CN115629155A (en) * | 2022-09-09 | 2023-01-20 | 华南理工大学 | Online multi-matrix VOCs analysis device and method |
| CN115629155B (en) * | 2022-09-09 | 2023-10-31 | 华南理工大学 | Online multi-matrix VOCs analysis device and method |
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