CN111999129A - Atmospheric water vapor collecting device and using method thereof - Google Patents
Atmospheric water vapor collecting device and using method thereof Download PDFInfo
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- CN111999129A CN111999129A CN202010690515.4A CN202010690515A CN111999129A CN 111999129 A CN111999129 A CN 111999129A CN 202010690515 A CN202010690515 A CN 202010690515A CN 111999129 A CN111999129 A CN 111999129A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
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Abstract
The invention discloses an atmospheric water vapor collecting device and a using method thereof, the device comprises a water vapor inlet cup, a liquid nitrogen storage box, a condensing box, a drying indicating box and a micro air pump, wherein the water vapor inlet cup is connected with the condensing box, cold trap equipment is arranged inside the condensing box, an acquisition valve is arranged inside the condensing box and positioned at the bottom of the cold trap equipment, the condensing box is connected with the liquid nitrogen storage box through a connecting pipe, a booster pump, a pressure gauge and a floating rule are arranged on the liquid nitrogen storage box, the booster pump is connected with the pressure gauge, the floating rule is positioned inside the liquid nitrogen storage box, an air outlet of the cold trap equipment is connected with the drying indicating box through an air outlet pipe, a drying indicator is arranged inside the drying indicating box, and the drying indicating box is connected with the micro air pump. The invention improves the automation of the atmospheric water vapor collecting device, and the automatic addition of liquid nitrogen in the condensing chamber reduces the low-temperature frostbite risk of artificially adding liquid nitrogen in the traditional cold trap condensing method.
Description
Technical Field
The invention relates to the technical field of atmospheric water vapor sampling, in particular to an atmospheric water vapor collecting device and a using method thereof.
Background
Atmospheric water vapor hydrogen-oxygen stable isotope is an important index for revealing atmospheric circulation and hydrologic circulation processes, the popularization and application of atmospheric water vapor isotope research are limited due to the lack and insufficiency of on-site monitoring data of the atmospheric water vapor isotope, a commonly used method is to carry out reasoning estimation on the near-surface atmospheric water vapor isotope by using a Rayleigh fractionation model based on rainfall observation, but uncertainty exists depending on the rainfall amount, the temperature for determining balance fractionation and the like, and therefore the current derivation relationship is not accurate. The method is mainly limited to actually measured water vapor isotope data, most researches still mainly depend on a calculation method of equilibrium fractionation, and uncertainty of quantitative researches such as regional water vapor recycling, ecological hydrology process evapotranspiration segmentation and the like is invisibly increased. In addition, isotope fractionation processes and content changes are simulated by means of global and regional scale kinetic models, but such models cannot be quantitatively analyzed on the scale of precipitation events. Therefore, to solve these problems, there is a need for a comprehensive and systematic direct observation and recognition of the atmosphere water vapor isotopes.
The importance of in-situ monitoring of atmospheric water vapour isotopes is undoubted, but currently, often due to limitations in the monitoring methods, the actual monitoring data are very poor for a considerable time. Although the advent of spectroscopic instrumentation has circumvented this problem to some extent in recent years, such instrumentation is expensive and complicated to operate in the field and difficult to ensure instrument stability, which in turn affects the quality of the water vapor isotope. Therefore, in the field of ecological hydrology and hydrological meteorological research, the collection of an atmospheric water vapor sample is required by means of a traditional method, the traditional water vapor collection method at present mainly comprises liquid nitrogen cold trap condensation, a dry ice refrigeration method, a drying agent dehydration method and a flash vacuum sampling bottle, and the traditional methods have the following problems: firstly, the condensation of the traditional liquid nitrogen cold trap needs to continuously supply liquid nitrogen to ensure that the cold trap is fully condensed,tightly controlling the flow velocity of the air flow; the dry ice refrigeration method is easy to cause isotope fractionation when the condensation temperature is not low enough, and wastes time and labor; ③ the moisture-absorbing desiccant contains O2Will cause isotope exchange; fourthly, the quantity of water vapor collected by a vacuum sampling bottle method is small, which is not beneficial to isotope analysis, especially in semiarid regions.
The collection of atmospheric water vapor isotopes is an important link in isotope ecological hydrology research, and is directly related to accurate assessment of regional precipitation processes and measurement and calculation of water balance. The unscientific sampling mode not only wastes the expenses and time of scientific researchers, but also causes the distortion of scientific research results. At present, the key problems to be solved urgently are collected based on a liquid nitrogen cold trap method: (1) how to improve the utilization rate of liquid nitrogen in the collection process; (2) how to ensure the water vapor liquefaction rate and further reduce the influence of the water vapor isotope fractionation on a sample. Therefore, when atmospheric water vapor is collected by using a liquid nitrogen cold trap method, the water vapor is required to be liquefied, collected and stored in a sealed manner, the influence of secondary evaporation on the water vapor sample isotope is prevented and treated, the convenience and the easy operability of the sampling device are improved, the device material is specially designed and selected to improve the water vapor collection efficiency, and the accuracy of the isotope is improved.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the invention provides an atmospheric water vapor collecting device and a using method thereof, which reduce the low-temperature frostbite risk of artificially adding liquid nitrogen in the traditional cold trap condensation method, thereby improving the safety performance of the collecting device and perfecting the water vapor flow monitoring, the liquid nitrogen amount monitoring and the temperature monitoring in the collecting device.
The embodiment of the invention provides an atmospheric water vapor collecting device which comprises a water vapor inlet cup, a liquid nitrogen storage box, a condensing box, a drying indicating box and a micro air pump, wherein the water vapor inlet cup is connected with the condensing box, cold trap equipment is arranged inside the condensing box, an acquisition valve is arranged inside the condensing box and positioned at the bottom of the cold trap equipment, the condensing box is connected with the liquid nitrogen storage box through a connecting pipe, a booster pump, a pressure gauge and a floating ruler are arranged on the liquid nitrogen storage box, the booster pump is connected with the pressure gauge, the floating ruler is positioned inside the liquid nitrogen storage box, an air outlet of the cold trap equipment is connected with the drying indicating box through an air outlet pipe, a drying indicator is arranged inside the drying indicating box, and the drying indicating box is connected with the micro air pump.
Furthermore, an air flow controller is arranged at the joint of the water vapor inlet cup and the condensing box.
Furthermore, the number of the cold trap devices is not less than two, and two adjacent cold trap devices are connected through a conduit.
Furthermore, a thermometer is arranged on the side surface of the cold trap device in the condensation box.
Further, the condensing box is bilayer structure, and the outer heat preservation that is the PVC material of skin, and the inlayer is stainless steel internal cooling layer, is provided with thermal-insulated insulation material between outer heat preservation and the internal cooling layer.
A use method of the atmospheric water vapor collecting device comprises the following steps:
installing a water vapor inlet cup at a preset height H, and connecting an air flow controller with cold trap equipment in a condenser box through a guide pipe;
the liquid nitrogen storage box, the condensing box and the drying indicating box are sequentially connected;
opening an air flow controller, enabling the atmosphere to enter a condensing box from a water vapor inlet cup, and starting cold trap equipment immediately;
under the action of the booster pump, an obvious pressure difference is formed between the liquid nitrogen storage box and the condenser box, and liquid nitrogen is automatically added into the condenser box;
and after condensation is finished, taking out the cold trap from the condensation box, placing the cold trap at normal temperature, mixing the cold trap melting water after the condensed water is melted, filling the cold trap melting water into a sampling bottle, refrigerating at low temperature, and finally studying and judging the atmospheric water vapor collection rate in a drying indicating box.
Furthermore, a pressure gauge and a floating ruler are further arranged in the liquid nitrogen storage box, the floating ruler is used for judging the volume of liquid nitrogen in the storage chamber, and the pressure gauge is used for observing the pressure change of the liquid nitrogen storage box.
Further, the cold trap is sealed and stored in the process.
Furthermore, a blue drying agent is arranged in the drying indication box and used for judging the water vapor collecting effect according to the color.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the automation of the atmospheric water vapor collecting device is improved, the automatic addition of the liquid nitrogen in the condensing chamber reduces the risk of low-temperature frostbite caused by the manual addition of the liquid nitrogen in the traditional cold trap condensing method, the liquid nitrogen is saved by collecting water vapor compared with the traditional low-temperature method, the water vapor condensing efficiency can be efficiently improved through the cold trap circulating system in the condensing chamber, and the water vapor isotope fractionation caused by the lower water vapor collecting rate is effectively avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of an atmospheric water vapor collection device in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a condensation box in the atmospheric water vapor collection device in the embodiment of the invention.
Fig. 3 is a flow chart of a method of using the atmospheric water vapor collection device in an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus, and associated applications, methods consistent with certain aspects of the invention, as detailed in the following claims.
FIG. 1 is a schematic structural diagram of an atmospheric water vapor collection device in an embodiment of the present invention, FIG. 2 is a schematic structural diagram of a condensation box in the atmospheric water vapor collection device in an embodiment of the present invention, as shown in FIGS. 1 and 2, the atmospheric water vapor collection device includes a water vapor inlet cup 1, a liquid nitrogen storage box 8, a condensation box 9, a drying indication box 10 and a micro air pump 12, the water vapor inlet cup is connected with the condensation box, an air flow controller 2 is arranged at the connection position of the water vapor inlet cup and the condensation box, a cold trap device 6 is arranged inside the condensation box, the cold trap is made of low temperature resistant glass material, the cold trap device is convenient to detach and carry, the air inlet end is longer than the air outlet end, the collection amount of condensed water vapor of the cold trap is increased, a water outlet switch is arranged at the lowest end of the bottom of the cold trap device, a collection valve 601 is arranged at the bottom of the cold trap device inside the condensation box, through pipe connection between two adjacent cold-trap equipment, liquid nitrogen loss volume in the supplementary condensation chamber improves atmospheric water vapor condensation efficiency in to the cold-trap, and the air inlet height that the cold-trap air inlet links to each other with the external world can be adjusted, collects the atmospheric water vapor of co-altitude not, and the inside of condensing box is located the side of cold-trap equipment and is provided with thermometer 7.
The condensing box is connected with the liquid nitrogen storage box through a connecting pipe, the condensing box is of a double-layer structure, the outer layer is an outer heat-insulating layer made of PVC material, the inner layer is an inner stainless steel material cooling layer, heat-insulating material 901 is arranged between the outer heat-insulating layer and the inner cooling layer, the liquid nitrogen storage chamber can indicate the change of the liquid nitrogen capacity in the liquid nitrogen storage chamber through a floating ruler, the cold traps in the condensing chamber are completely immersed by the liquid nitrogen, and water vapor circulates among a plurality of cold traps, so that the problem that the isotope fractionation is influenced due to incomplete condensation of the water vapor is effectively solved, the test precision of isotopes in an atmospheric water vapor sample is ensured, meanwhile, the arrangement of the drying indicating chamber can facilitate the research and judgment of the collection efficiency of the whole device on the atmospheric water vapor, the sealing performance of the device is favorably checked, a booster pump 3, a pressure gauge 4, the air outlet of the cold trap equipment is connected with a drying indicating box through an air outlet pipe, a drying indicator 11 is arranged inside the drying indicating box, and the drying indicating box is connected with a micro air pump.
Fig. 3 is a flow chart of a method for using the atmospheric water vapor collection device according to the embodiment of the present invention, and as shown in fig. 3, the method for using the atmospheric water vapor collection device includes the following steps:
And step 102, sequentially connecting the liquid nitrogen storage box, the condensing box and the drying indicating box.
And step 104, forming an obvious pressure difference between the liquid nitrogen storage box and the condenser box under the action of the booster pump, and automatically adding liquid nitrogen into the condenser box.
And the liquid nitrogen storage box is also internally provided with a pressure gauge and a floating ruler, the floating ruler is used for judging the volume of liquid nitrogen in the storage chamber, and the pressure gauge is used for observing the pressure change of the liquid nitrogen storage box.
And 105, after condensation is finished, taking out the cold trap from the condensation box, placing the cold trap at normal temperature, sealing and storing the cold trap in the process, mixing cold trap melting water after the condensed water is melted, filling the mixed water into a sampling bottle, refrigerating at low temperature, and finally studying and judging the atmospheric water vapor collection rate in a drying indicating box.
The drying indication box is internally provided with a blue drying agent which is used for judging the collecting effect of water vapor according to the color.
By adopting the embodiment of the invention, the automation of the atmospheric water vapor collecting device is improved, the low-temperature freezing injury risk of artificially adding liquid nitrogen in the traditional cold trap condensation method is reduced by automatically adding liquid nitrogen in the condensation chamber, the liquid nitrogen is saved compared with the traditional low-temperature method for collecting water vapor, the water vapor condensation efficiency can be efficiently improved through the cold trap circulation system in the condensation chamber, and the water vapor isotope fractionation caused by the lower water vapor collection rate is effectively avoided.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. The utility model provides an atmosphere steam collection device, its characterized in that, includes steam inlet cup, liquid nitrogen hutch, condensing box, dry indicator box and miniature air pump, the steam inlet cup is connected with the condensing box, the inside of condensing box is provided with cold trap equipment, the inside of condensing box is located the bottom of cold trap equipment and installs the collection valve, is connected through the connecting pipe between condensing box and the liquid nitrogen hutch, be provided with booster pump, manometer and float gauge on the liquid nitrogen hutch, the booster pump is connected with the manometer, and the float gauge is located the inside of liquid nitrogen hutch, and the gas outlet of cold trap equipment passes through the outlet duct and is connected with dry indicator box, dry indicator box's inside is provided with dry indicator, and dry indicator box is connected with miniature air pump.
2. The atmospheric water vapor collection device according to claim 1, wherein a gas flow controller is provided at a connection of the water vapor inlet cup and the condensation tank.
3. The atmospheric water vapor collection device according to claim 1, wherein the number of the cold trap devices is not less than two, and two adjacent cold trap devices are connected through a conduit.
4. The atmospheric water vapor collection device according to claim 1, wherein a thermometer is disposed inside the condensation tank on a side of the cold trap apparatus.
5. The atmospheric water vapor collection device according to claim 1, wherein the condensation tank has a double-layer structure, the outer layer is an outer PVC heat-insulating layer, the inner layer is an inner stainless steel cooling layer, and a heat-insulating material is arranged between the outer heat-insulating layer and the inner cooling layer.
6. The use method of the atmospheric water vapor collecting device is characterized by comprising the following steps:
installing a water vapor inlet cup at a preset height H, and connecting an air flow controller with cold trap equipment in a condenser box through a guide pipe;
the liquid nitrogen storage box, the condensing box and the drying indicating box are sequentially connected;
opening an air flow controller, enabling the atmosphere to enter a condensing box from a water vapor inlet cup, and starting cold trap equipment immediately;
under the action of the booster pump, an obvious pressure difference is formed between the liquid nitrogen storage box and the condenser box, and liquid nitrogen is automatically added into the condenser box;
and after condensation is finished, taking out the cold trap from the condensation box, placing the cold trap at normal temperature, mixing the cold trap melting water after the condensed water is melted, filling the cold trap melting water into a sampling bottle, refrigerating at low temperature, and finally studying and judging the atmospheric water vapor collection rate in a drying indicating box.
7. The use method of the atmospheric water vapor collection device according to claim 6, wherein a pressure gauge and a float gauge are further arranged in the liquid nitrogen storage tank, the float gauge is used for judging the volume of the liquid nitrogen in the storage tank, and the pressure gauge is used for observing the pressure change of the liquid nitrogen storage tank.
8. The method of using the atmospheric water vapor collection device according to claim 6, wherein said removing the cold trap from the condensation chamber is further performed at ambient temperature, during which the cold trap is hermetically sealed.
9. The use method of the atmospheric water vapor collection device according to claim 6, wherein a blue drying agent is arranged in the drying indication box, and the drying agent is used for judging the water vapor collection effect according to the color.
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| CN202010690515.4A CN111999129A (en) | 2020-07-17 | 2020-07-17 | Atmospheric water vapor collecting device and using method thereof |
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| CN202010690515.4A CN111999129A (en) | 2020-07-17 | 2020-07-17 | Atmospheric water vapor collecting device and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113008727A (en) * | 2021-02-21 | 2021-06-22 | 中国科学院地质与地球物理研究所 | Water vapor recirculation ratio measuring system and measuring method thereof |
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