CN110975536A - Multi-channel vaporization detection platform and application thereof - Google Patents
Multi-channel vaporization detection platform and application thereof Download PDFInfo
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- 230000008016 vaporization Effects 0.000 title claims abstract description 174
- 238000009834 vaporization Methods 0.000 title claims abstract description 119
- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 238000010926 purge Methods 0.000 claims abstract description 25
- 238000004868 gas analysis Methods 0.000 claims description 43
- 238000004891 communication Methods 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 238000004458 analytical method Methods 0.000 claims description 25
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- 238000012360 testing method Methods 0.000 claims description 23
- 238000001704 evaporation Methods 0.000 claims description 14
- 230000008020 evaporation Effects 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
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- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 16
- 230000003068 static effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000000155 isotopic effect Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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Abstract
The invention discloses a multi-channel vaporization detection platform which comprises at least two vaporization channels. The invention discloses a multi-channel vaporization detection platform, which greatly shortens the sample measurement time by arranging a plurality of vaporization channels, wherein when one channel is in measurement, the other channel is in purging, static balance and the like.
Description
Technical Field
The invention relates to a detection platform, in particular to a multi-channel vaporization detection platform and application thereof.
Background
Currently, the sample that can be detected by the concentration and isotope ratio analysis equipment commonly available on the market is a gas sample. For testing of liquid samples, a vaporization platform is required to vaporize the sample, converting it to a gaseous sample for testing, as opposed to the analytical technique used. The existing vaporization platform and vaporization method for processing liquid samples cannot provide better pretreatment samples for an analysis test instrument, and further can influence the accuracy of detection results. Such as isotope ratio measurements of water.
The measurement of hydrogen-oxygen isotope ratio in liquid and water vapor has good application in environmental monitoring, biomedical diagnosis and other industrial, medical and environmental research fields. Since the sample that can be detected by the hydrogen-oxygen isotope ratio analysis apparatus in water is in a gaseous state, it is necessary to convert the sample into a gas and then detect the gas by the hydrogen-oxygen isotope ratio analysis apparatus in water. Isotope ratio analysis is very precise analysis, so the process of converting a liquid sample into gas has a severe requirement, and the gas obtained by the conventional vaporization platform and the vaporization method cannot meet the detection standard of a later analysis instrument. The detection of the hydrogen-oxygen isotope ratio in water requires that 100 percent of liquid water is converted into water vapor and the water vapor is completely transmitted to an analyzer for detection, or part of the water vapor is detected after being uniformly mixed. If a certain amount of liquid water is evaporated over a period of time, the isotopic content of the water vapour will change over time. If the evaporation is incomplete and the liquid remains at the end of a certain time, the isotope content in the entire water vapour may differ from the original liquid and the remaining liquid, for example due to temperature dependent fractionation during evaporation, etc., resulting in a non-uniform way of entering the evaporated liquid sample into the analyzer, in which case the following procedure is required: a) the total vapor amount must be analyzed; b) during the gas flow, the concentration, isotope ratio and flow rate are each measured (or precisely controlled) as a function of time; c) the determined isotope ratio is calculated by multiplying the measured gas isotope ratio by the concentration and flow rate. The above steps a-c result in complexity and inaccuracy in the determination of the liquid isotope ratio, require additional measurements or controls (e.g. flow rate) and introduce additional complexity and sources of error which cause inconvenience to the analysis of the sample.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide a multi-channel vaporizing platform, which uses at least two vaporizing channels to start detection simultaneously, thereby shortening the sample analysis time.
The second purpose of the invention is to provide an application of the multi-channel vaporization platform, which reduces memory effect and liquid residue and ensures more accurate determination result.
One of the purposes of the invention is realized by adopting the following technical scheme:
a multi-channel vaporization detection platform includes at least two vaporization channels.
The device further comprises two vaporization channels which are respectively a first vaporization channel and a second vaporization channel, wherein the first vaporization channel comprises a first vaporization chamber, the second vaporization channel comprises a second vaporization chamber, the device further comprises a dryer connected with the first vaporization chamber and the second vaporization chamber, the first vaporization chamber and the second vaporization chamber are connected with a gas analysis device, and the gas analysis device is connected with the dryer.
The device further comprises a vacuum pump, a first filter is further arranged between the first vaporizing chamber and the gas analysis device, a second filter is further arranged between the second vaporizing chamber and the gas analysis device, and the first filter and the second filter are both connected with the vacuum pump.
Further, a first control device is arranged between the dryer and the first vaporizing chamber, a third control device is arranged between the first vaporizing chamber and the first filter, a fifth control device is arranged between the first filter and the vacuum pump, a second control device is arranged between the second vaporizing chamber and the dryer, a fourth control device is arranged between the second vaporizing chamber and the second filter, and a sixth control device is arranged between the second filter and the vacuum pump.
Furthermore, a seventh control device is arranged between the first filter, the second filter and the gas analysis device, the seventh control device is respectively connected with the fifth control device and the sixth control device, and the seventh control device is connected with the dryer.
Furthermore, a first communication device is arranged among the first control device, the second control device and the dryer, a second communication device is arranged among the fifth control device, the sixth control device and the vacuum pump, and the fifth control device and the sixth control device are connected with the seventh control device through a third communication device. The dryer is characterized in that a fourth communication device is arranged between the dryer and the gas analysis device, an eighth control device and an air supply device are further arranged between the fourth communication device and the gas analysis device, the eighth control device is respectively connected with the air supply device and the seventh control device, and the first communication device is connected with the fourth communication device.
Further, the first control device, the second control device, the third control device and the fourth control device are all two-way solenoid valves, the fifth control device, the sixth control device, the seventh control device and the eighth control device are all two-position three-way solenoid valves, and the first communication device, the second communication device, the third communication device and the fourth communication device are all three-way joints.
Furthermore, all be equipped with sampling device on first vaporizer and the second vaporizer, sampling device includes the introduction port, is located the introduction port's a kind diaphragm, passes the syringe needle of introduction diaphragm, still be equipped with porous screen in the introduction port.
Further, the outer side walls of the first gasification chamber and the second gasification chamber are provided with temperature control devices.
Further, the gas analysis device is one of a spectrometer, a cavity ring-down spectrometer and a cavity enhanced absorption spectrometer. Other gas analysis devices may also be selected as desired.
The second purpose of the invention is realized by adopting the following technical scheme:
the application of the multi-channel vaporization detection platform is used for introducing a vaporized liquid sample into a gas analysis device.
Further, the method comprises the following steps:
(1) carrying out a purging process on the first vaporizing passage by using dry gas, and then carrying out a complete purging process for 2-3 times by using a liquid sample to be detected, wherein the first vaporizing passage enters a state of the sample to be detected after the complete purging process is finished;
(2) injecting a sample to be tested into a first vaporizing chamber, standing until steam is homogenized, then introducing dry gas, keeping the mixed gas balanced in the first vaporizing chamber after standing, and completing preparation of the sample to be tested by a first vaporizing channel; the homogeneity of the vapor sample is ensured by standing, and the concentration and the isotope ratio of the condition sample do not change obviously after the condition sample enters an analytical instrument, so that a quick measurement result can be provided for single measurement of the condition sample, the original liquid sample can be represented correctly, and in addition, the condition sample can be measured for multiple times and averaged to improve the measurement precision;
(3) introducing the gas of the first vaporization chamber after standing into a gas analysis device, and starting an analysis test;
(4) when the gas of the first vaporization channel starts to be analyzed and tested, the second vaporization channel starts to be blown, firstly, dry gas is adopted for blowing, then, the liquid sample to be tested is blown for 2-3 times, and the second vaporization channel enters the state of the sample to be tested;
(5) injecting a liquid sample to be tested into the second gasification channel, standing until steam is homogenized, then introducing dry gas, keeping the mixed gas balanced in a second gasification chamber after standing, and completing the preparation before the test of the sample to be tested by the second gasification channel;
(6) purging the dry gas by using a gas analysis device for analyzing the first evaporation channel sample, and then starting to analyze and detect the second evaporation channel sample;
(7) the above process is repeated 2-3 times to complete the analysis of one sample. .
Further, before purging the first gasification passage, a sample preparation process is also included, and the process comprises the following steps: and starting temperature control devices of the first vaporization chamber and the second vaporization chamber, simultaneously heating the first vaporization chamber and the second vaporization chamber to the sample vaporization temperature, starting a vacuum pump, and carrying out air leakage test on air by the gas analysis device.
Further, the step (1) includes:
a: firstly, opening a first control device and a third control device, purging a first vaporization chamber by gas from a dryer, and simultaneously absorbing dry gas by a vacuum pump;
b: then closing the first control device, vacuumizing the first gasification chamber, and closing the third control device;
c: injecting a sample to be detected into the first vaporizing chamber through a sample injection needle, starting the first control device after homogenization is completed, allowing dry gas to enter the first vaporizing chamber, then closing the first control device, and standing and uniformly mixing the vapor of the sample to be detected and the dry gas;
d: starting a third control device, completely pumping the uniformly mixed gas by using a vacuum pump, and closing the third control device when the first gasification chamber is in a vacuum state;
e: injecting the sample through the sample injection device again, repeating the processes of the step C and the step D, and enabling the first gasification channel to enter a state of the sample to be detected.
Further, the step (2) includes:
a: opening the eighth control device, and communicating the dryer with the gas analysis device to enable the dryer to purge the gas analysis device;
b: injecting a sample to be detected into the first vaporizing chamber through the sampling needle, starting the first control device after the homogenization is finished, allowing the dry gas to enter the first vaporizing chamber, then closing the first control device, and standing and uniformly mixing the vapor of the sample to be detected and the dry gas.
Further, the step (3) includes synchronously opening the fifth control device and the seventh control device, closing the eighth control device, and allowing the vapor of the sample to be analyzed to enter the gas analysis device for analysis and test.
Further, the purging process of the second vaporization passage in the step (4) is as follows:
a: firstly, opening a second control device and a fourth control device, purging a second vaporization chamber by using gas from a dryer, and absorbing dry gas by using a vacuum pump;
b: then closing the second control device, vacuumizing the second gasification chamber, and closing the fourth control device;
c: injecting a sample to be detected into the second vaporizing chamber through the sample injection needle, starting the second control device after homogenization is completed, allowing dry gas to enter the second vaporizing chamber, then closing the second control device, and standing and uniformly mixing the vapor of the sample to be detected and the dry gas;
d: opening the fourth control device, completely pumping the uniformly mixed gas by using a vacuum pump, and closing the fourth control device when the second gasification chamber is in a vacuum state;
e: injecting the sample through the sample injection device again, repeating the processes of the step C and the step D, and enabling the second gasification channel to enter a state of the sample to be detected.
And (5) injecting a sample to be detected into the second vaporizing chamber through the sampling needle, starting the second control device after homogenization is completed, allowing dry gas to enter the second vaporizing chamber, then closing the second control device, and standing and uniformly mixing the vapor of the sample to be detected and the dry gas.
Further, before the analysis and detection of the second evaporation channel sample in the step (6), the fifth control device needs to be closed, the sixth control device and the seventh control device need to be opened, and the sample in the second evaporation chamber enters the gas analysis device to start the analysis and test.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses a multi-channel vaporization detection platform, which greatly shortens the sample measurement time by arranging a plurality of vaporization channels, wherein when one channel is in measurement, the other channel is in purging, static balance and the like.
Drawings
FIG. 1 is a schematic structural view of a multi-pass vaporization platform according to embodiment 1 of the present invention;
in the figure: 1. a first vaporization chamber; 2. a first filter; 3. a first control device; 4. a third control device; 5. a fifth control device; 6. a second vaporization chamber; 7. a second filter; 8. a second control device; 9. a fourth control device; 10. a sixth control device; 11. a first communication device; 12. a second communication means; 13. a third communication device; 14. a fourth communication device; 15. a dryer; 16. an air supply device; 17. a vacuum pump; 18. a temperature control device; 19. a seventh control device; 20. an eighth control device; 21. a gas analysis device; 22. a sample introduction device; 222. a sample introduction diaphragm; 223. a sample injection needle; 224. a porous screen.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example 1
A multi-channel vaporization detection platform comprising at least two vaporization channels, as shown in fig. 1: the arrows in the figure indicate the direction of flow of the sample or gas. The two vaporization passages are respectively a first vaporization passage and a second vaporization passage in the present embodiment, the first vaporization passage comprises a first vaporization chamber 1, a first filter 2 and a second vaporization chamber 6 which are sequentially arranged, the second vaporization chamber 6 and the second filter 7 are sequentially arranged, preferably, the first filter 2 and the second filter 7 are stainless steel sintered filters, and the cleanliness of the gas entering the gas analysis device 21 is ensured. The first vaporization chamber 1 and the second vaporization chamber 6 are communicated with a dryer 15 for supplying nitrogen or zero air. The first filter 2 and the second filter 7 are connected to a gas analyzing device 21, and the gas analyzing device 21 is connected to the dryer 15 and the air supply device 16, respectively. The preferred gas analysis device 21 is one of a spectrometer, a cavity ring down spectrometer, a cavity enhanced absorption spectrometer. Other gas analysis devices 21 may also be selected as desired. The first filter 2 and the second filter 7 are also connected with a vacuum pump 17, and the maximum vacuum degree which can be provided by the vacuum pump 17 is less than 1torr, so that the first gasification chamber 1 and the second gasification chamber 6 can be vacuumized conveniently.
A first control device 3 is arranged between the dryer 15 and the first vaporizing chamber 1, a third control device 4 is arranged between the first vaporizing chamber 1 and the first filter 2, a fifth control device 5 is arranged between the first filter 2 and the vacuum pump 17, a second control device 8 is arranged between the second vaporizing chamber 6 and the dryer 15, a fourth control device 9 is arranged between the second vaporizing chamber 6 and the second filter 7, and a sixth control device 10 is arranged between the second filter 7 and the vacuum pump 17. A seventh control device 19 is arranged between the first filter 2, the second filter 7 and the gas analysis device 21, the seventh control device 19 is connected with the fifth control device 5 and the sixth control device 10 respectively, and the seventh control device is connected with the dryer 15.
The first control device 3 and the second control device 8 are connected to the dryer 15 via a first communication device 11, the fifth control device 5 and the sixth control device 10 are connected to the vacuum pump 17 via a second communication device 12, and the fifth and sixth control devices 10 are connected to the seventh control device 19 via a third communication device 13. The dryer 15 is connected with the gas analysis device 21 through the fourth communication device 14, an eighth control device 20 is further arranged between the fourth communication device 14 and the gas analysis device 21, the eighth control device 20 is respectively connected with the seventh control device 19 and the air supply device 16, and the first communication device 11 is connected with the fourth communication device 14.
Preferably, the first control device 3, the second control device 8, the third control device 4, and the fourth control device 9 are all two-way solenoid valves, which are opened to allow gas to pass therethrough when energized, and closed to prevent gas from passing therethrough when de-energized. The fifth control device 5, the sixth control device 10, the seventh control device 19, and the eighth control device 20 are all two-position three-way solenoid valves, and when the two-position three-way solenoid valves are energized, the two-position three-way solenoid valves indicate that gas passes through between the interface a and the interface B, and when the two-position three-way solenoid valves are not energized, the two-position three-way solenoid valves indicate that gas passes through between the interface C and the interface B. The first communication device 11, the second communication device 12, the third communication device 13 and the fourth communication device 14 are all three-way joints. The control device is not limited to the above listed valve types, and those skilled in the art may select other devices capable of implementing air path control according to the needs.
The first vaporizing chamber 1 and the second vaporizing chamber 6 are both provided with a sample injection device 22, the sample injection device 22 comprises a sample injection membrane 222 located at a sample injection port, a sample injection needle 223 penetrating through the sample injection membrane 222, and a porous screen 224 arranged in the sample injection port and used for adsorbing salt in a sample. Specifically, the injection can be performed by an automatic injection needle or manually.
The outer side walls of the first vaporizing chamber 1 and the second vaporizing chamber 6 are provided with temperature control devices 18, and the vaporizing temperature of the sample is reached in the measuring process. Preferably, the temperature control device 18 comprises a heating control module and a temperature sensor (not shown in the figure, and those skilled in the art can set according to the prior art), the temperature of the vaporization chamber is adjusted by the temperature control device 18, and the temperature of the vaporization chamber is kept within a stable range, and preferably, the shell of the first vaporization chamber 1 and the shell of the second vaporization chamber 6 are provided with heat insulation layers, and the other parts of the vaporization platform can be provided with heat insulation layers, so that the fluctuation range of the temperature is reduced, and the detection accuracy is ensured. The material of the first vaporizing chamber 1 and the second vaporizing chamber 6 is preferably corundum with the purity of more than 99 percent, or other materials with smooth and clean weakly-adsorption antirust surfaces are selected. The present embodiment is designed as a dual-channel vaporizing chamber, but is not limited thereto, and a three-channel vaporizing chamber can be used for cycle testing, or more channels can be used, depending on the size of the sample amount and the requirement for the measurement time.
Example 2
The application of the multi-channel vaporization platform for introducing a liquid sample into a gas analysis device 21 after vaporization comprises the following steps:
(1) sample preparation: opening temperature control devices 18 of the first vaporization chamber 1 and the second vaporization chamber 6, simultaneously heating the first vaporization chamber 1 and the second vaporization chamber 6 to 140 ℃, opening a vacuum pump 17 to enable the pressure at the interface of the vacuum pump 17 to be less than 1torr, controlling the pressure of a dryer connected to the fourth communication device 14 to be in a pressure state of 2.5PSI through a pressure reducing valve, before sample measurement is started, all electromagnetic valves serving as the control devices are not powered on, and a gas analysis device 21 performs air-free running test air;
(2) the first gasification channel sample measurement purging:
a: first the first control means 3 and the third control means 4 are opened and the first vaporization chamber 1 is purged with gaseous nitrogen or zero air from the dryer, while the vacuum pump 17 absorbs the dry gas, which lasts for 10 s;
b: then the first control device 3 is closed, the first gasification chamber 1 is vacuumized, the process lasts for 10s, and the third control device 4 is closed;
c: injecting 2 microliters of liquid water samples into the first vaporizing chamber 1 through a sample injection needle, completely vaporizing liquid water, homogenizing water vapor in the first vaporizing chamber 1 within 30 seconds, starting the first control device 1s, introducing dry gas into the first vaporizing chamber 1, then closing the first control device 3, standing and uniformly mixing the sample vapor to be detected and the dry gas, wherein the process is 60 seconds;
d: starting the third control device 4, completely pumping the uniformly mixed gas by using a vacuum pump 17 for 10s, and closing the third control device 4 when the first gasification chamber 1 is in a vacuum state;
e: and injecting 2 microliters of liquid water sample again through the sample injection device 22, repeating the processes of the step C and the step D, and enabling the first vaporizing chamber 1to enter a vacuum state and the first vaporizing channel to enter a sample state to be detected after the processes are completed.
(3) The first vaporization channel performs sample preparation:
a: opening the eighth control device to communicate the dryer with the gas analysis device 21, and purging the gas analysis device 21 with the dryer;
b: injecting a 2 microliter liquid water sample to be detected into the first vaporizing chamber 1 through a sample injection needle, standing for 30s after the liquid water sample is completely vaporized, completing homogenization of water vapor, starting a first control device, allowing dry gas to enter the first vaporizing chamber 1, closing the first control device 3 after 1s, standing for 90s for uniformly mixing the sample vapor to be detected and the dry gas, and balancing the mixed gas in the first vaporizing chamber 1;
(4) sample testing of the first vaporization channel: synchronously opening the fifth control device 5 and the seventh control device 19, closing the eighth control device 20, and allowing the sample vapor to be analyzed to enter the gas analysis device 21 from the first vaporization chamber 1 for analysis and test for 270 s;
(5) and (3) sampling and purging of a second gasification channel: when the gas of the first vaporization channel starts the analysis test, the second vaporization channel starts to be purged, and the purging process of the second vaporization channel is as follows:
a: the second control device 8 and the fourth control device 9 are first opened, the nitrogen from the dryer purges the second vaporization chamber 6, at the same time, the vacuum pump 17 absorbs the dry gas, this process lasts for 10 s;
b: then the second control device 8 is closed, the second gasification chamber 6 is vacuumized, the process lasts for 10s, and the fourth control device 9 is closed;
c: injecting a 2 microliter liquid water sample to be detected into the second vaporizing chamber 6 through a sample injection needle, completely vaporizing liquid water, homogenizing water vapor in the second vaporizing chamber 6 after 30 seconds, starting the second control device 1s, introducing dry gas into the second vaporizing chamber 6, then closing the second control device 8, and standing the sample vapor and the dry gas to be detected for 60 s. The gas is evenly mixed and balanced;
d: opening the fourth control device 9, completely pumping the uniformly mixed gas by using the vacuum pump 17 for 10s, and closing the fourth control device 9 when the second gasification chamber 6 is in a vacuum state;
e: and (3) injecting 2 microliters of water liquid sample again through the sample injection device 22, repeating the processes of the step (C) and the step (D), and enabling the second gasification channel to enter a sample state to be detected.
(6) The second vaporization channel performs sample preparation: 2 microliter liquid water sample is injected into the second vaporizing chamber 6 through the sampling needle, after the liquid water sample is completely vaporized, the liquid water sample is kept stand for 30s, the water vapor is homogenized, the second control device is started, the dry gas enters the second vaporizing chamber 6, then the second control device 8 is closed for 1s, the sample vapor to be tested and the dry gas are kept stand and uniformly mixed, the mixed gas is balanced in the second vaporizing chamber 6 after the sample vapor to be tested is kept stand for 90s, and the second vaporizing channel completes the preparation before the test of the sample to be tested.
(7) At this time, after the sample of the first evaporation channel is measured, purging the dry gas by the gas analysis device 21 which finishes the analysis of the sample of the first evaporation channel, closing the fifth control device 5 after 60s, opening the sixth control device 10 and the seventh control device 19, allowing the sample of the second evaporation chamber 6 to enter the gas analysis device 21, and starting the analysis and detection of the sample of the second evaporation channel, wherein the test time is 270 s;
(8) and (3) repeating the steps (2) and (3) by the first vaporization channel, after the sample of the second vaporization channel is analyzed, the sample of the first vaporization channel enters the process (4), and repeating the processes (2) to (7) for 2-3 times by the second vaporization channel from the beginning steps (5) to (7) until the analysis of one liquid sample is completed.
Comparative example 1
Comparative example 1 analysis of a sample was performed using a conventional platform with only one vaporization chamber.
Comparing the analytical procedure of the present invention with comparative example 1, the following advantages are obtained: the traditional mode only has one vaporizing chamber, measurement cannot be performed alternately, three times of dry gas purging are required, the time consumed for the previous time is 60s, the time consumed for the second time of dry gas purging is 90s each time, the time consumed for the third time of sample preparation is 150s, the time consumed for the sample testing is 270s, after the test is finished, the time consumed for purging by a gas analysis device is 60s, and the time consumed for testing one sample is about 630 s. In the analysis process of the embodiment 2 of the invention, a double-channel detection measurement mode is adopted, and the time consumed for completing the test of one needle is about 320 seconds, so that the detection time can be shortened, and the efficiency of sample analysis and measurement can be improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A multi-channel vaporization detection platform is characterized by comprising at least two vaporization channels.
2. The multi-channel vaporization detection platform of claim 1, comprising two vaporization channels, namely a first vaporization channel and a second vaporization channel, wherein the first vaporization channel comprises a first vaporization chamber, the second vaporization channel comprises a second vaporization chamber, and a dryer connected to the first vaporization chamber and the second vaporization chamber, the first vaporization chamber and the second vaporization chamber are connected to a gas analysis device, and the gas analysis device is connected to the dryer.
3. The multi-channel vaporization detection platform of claim 2, further comprising a vacuum pump, wherein a first filter is disposed between the first vaporization chamber and the gas analysis device, a second filter is disposed between the second vaporization chamber and the gas analysis device, and the first filter and the second filter are both connected to the vacuum pump.
4. The multi-channel vaporization detection platform of claim 3, wherein a first control device is disposed between the dryer and the first vaporization chamber, a third control device is disposed between the first vaporization chamber and the first filter, a fifth control device is disposed between the first filter and the vacuum pump, a second control device is disposed between the second vaporization chamber and the dryer, a fourth control device is disposed between the second vaporization chamber and the second filter, and a sixth control device is disposed between the second filter and the vacuum pump.
5. The multi-channel vaporization detection platform of claim 4, wherein a seventh control device is disposed between the first filter, the second filter and the gas analysis device, the seventh control device is connected to the fifth control device and the sixth control device, and the seventh control device is connected to the dryer.
6. The multi-channel vaporization detection platform of claim 5, wherein a first communication device is disposed between the first control device, the second control device and the dryer, a second communication device is disposed between the fifth control device, the sixth control device and the vacuum pump, and the fifth control device and the sixth control device are connected through a third communication device and a seventh control device. The dryer is characterized in that a fourth communication device is arranged between the dryer and the gas analysis device, an eighth control device and an air supply device are further arranged between the fourth communication device and the gas analysis device, the eighth control device is respectively connected with the air supply device and the seventh control device, and the first communication device is connected with the fourth communication device.
7. The multi-channel vaporization detection platform of claim 6, wherein the first control device, the second control device, the third control device, and the fourth control device are all two-way solenoid valves, the fifth control device, the sixth control device, the seventh control device, and the eighth control device are all two-position three-way solenoid valves, and the first communication device, the second communication device, the third communication device, and the fourth communication device are all three-way connectors.
8. The multi-channel vaporization detection platform according to claim 1, wherein the first vaporization chamber and the second vaporization chamber are both provided with a sample injection device, the sample injection device comprises a sample injection port, a sample injection membrane located at the sample injection port, and a sample injection needle penetrating through the sample injection membrane, and a porous screen is further provided in the sample injection port.
9. Use of a multi-channel evaporation detection platform according to any of claims 1to 8 for introducing a liquid sample into a gas analysis device after evaporation, comprising the steps of:
(1) carrying out a purging process on the first vaporizing passage by using dry gas, and then carrying out a complete purging process for 2-3 times by using a liquid sample to be detected, wherein the first vaporizing passage enters a state of the sample to be detected after the complete purging process is finished;
(2) injecting a sample to be tested into a first vaporizing chamber, standing until steam is homogenized, then introducing dry gas, keeping the mixed gas balanced in the first vaporizing chamber after standing, and completing preparation of the sample to be tested by a first vaporizing channel;
(3) introducing the gas of the first vaporization chamber after standing into a gas analysis device, and starting an analysis test;
(4) when the gas of the first vaporization channel starts to be analyzed and tested, the second vaporization channel starts to be blown, firstly, dry gas is adopted for blowing, then, the liquid sample to be tested is blown for 2-3 times, and the second vaporization channel enters the state of the sample to be tested;
(5) injecting a liquid sample to be tested into the second gasification channel, standing until steam is homogenized, then introducing dry gas, keeping the mixed gas balanced in a second gasification chamber after standing, and completing the preparation before the test of the sample to be tested by the second gasification channel;
(6) purging the dry gas by using a gas analysis device for analyzing the first evaporation channel sample, and then starting to analyze and detect the second evaporation channel sample;
(7) the above process is repeated 2-3 times to complete the testing of one liquid sample.
10. Use of a multi-channel vaporization platform according to claim 9, further comprising a sample preparation process prior to purging the first vaporization channel, the process comprising: and starting temperature control devices of the first vaporization chamber and the second vaporization chamber, simultaneously heating the first vaporization chamber and the second vaporization chamber to the sample vaporization temperature, starting a vacuum pump, and carrying out air leakage test on air by the gas analysis device.
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