CN215985387U - Device for collecting VOCs (volatile organic compounds) generated on water-gas interface by dynamic laboratory method - Google Patents
Device for collecting VOCs (volatile organic compounds) generated on water-gas interface by dynamic laboratory method Download PDFInfo
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- CN215985387U CN215985387U CN202122363454.3U CN202122363454U CN215985387U CN 215985387 U CN215985387 U CN 215985387U CN 202122363454 U CN202122363454 U CN 202122363454U CN 215985387 U CN215985387 U CN 215985387U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
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Abstract
The utility model discloses a device for collecting VOCs (volatile organic compounds) generated at a water-gas interface by a dynamic laboratory method, which comprises a gas collecting bottle, wherein a gas enrichment sample box communicated with the bottom of the gas collecting bottle is arranged at the bottom of the gas collecting bottle, a first gas dispersing frame and a second gas dispersing frame are arranged at two ends of the gas collecting bottle, a first fan and a second fan are respectively arranged between the two ends of the gas collecting bottle and the first gas dispersing frame and between the two ends of the gas collecting bottle and the second gas dispersing frame, one end of the first gas dispersing frame, far away from the first fan, is connected with a first gas flowmeter, one end of the second gas dispersing frame, far away from the second fan, is connected with a second gas flowmeter, and a thermometer and a liquid level meter are respectively arranged in the gas collecting bottle. The whole structure is simple in design, very flexible and convenient to use, capable of being adjusted according to requirements at will, wide in adaptability, strong in practicability, small in limitation of the whole structure, and capable of being used in matching experiments in different proportions and modes at will.
Description
Technical Field
The utility model relates to the technical field of gas detection and environmental protection, in particular to a device for collecting VOCs (volatile organic compounds) generated on a water-gas interface by using a dynamic laboratory method.
Background
In China, VOCs refer to organic compounds with saturated vapor pressure of more than 70Pa at normal temperature and boiling point of less than 260 ℃ at normal pressure, or all organic compounds with vapor pressure of more than or equal to 10Pa and volatility at 20 ℃, the main sources of the volatile organic compounds are oil refineries, chemical engineering, fuel combustion, pharmaceutical factories, automobile industry, textile manufacturing, solvent processes, cleaning products, printing machines, insulating materials, office supplies, printers and the like, and the volatile organic compounds comprise halogenated hydrocarbon, aldehyde, aromatic compounds, polycyclic aromatic hydrocarbons, alcohols, alkanes, ketones, olefins and ethers;
volatile organic compounds constitute a serious threat to the ecological environment and to human health, since they are mostly extremely toxic, carcinogenic and dangerous, hazardous to humans: in the enclosed space, volatile organic compounds can cause irritation to the eyes, nose and throat, and more seriously, dizziness, headache, impaired memory and vision, and even death. To the environment, volatile organic compounds are also a major cause of stratospheric ozone depletion and regional ozone formation;
however, the research on the VOCs released from water is relatively few, so it is very important to develop a device for detecting VOCs generated on water surface, especially for severely polluted water and waste water discharged from factories, which often emit some malodorous gases, and a large part of the malodorous gases are VOCs, and the research on the VOCs generated from a large area of water is not trivial.
The existing problem is that the acquisition devices of some VOCs are too complex, and after the structure is complex, the equipment material in the acquisition devices can inevitably influence the accuracy of experimental results, and can be influenced by volatile organic compounds generated by the devices. And cause problems in operation or in post-maintenance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the prior art, and provides a device for collecting VOCs generated by a water-gas interface by using a dynamic laboratory method.
In order to achieve the purpose, the utility model adopts the following technical scheme: a device for collecting VOCs generated at a water-gas interface by a dynamic laboratory method comprises a gas collecting bottle, wherein a gas enrichment sample box communicated with the gas collecting bottle is arranged at the bottom of the gas collecting bottle, a first gas dispersing frame and a second gas dispersing frame are arranged at two ends of the gas collecting bottle, a first fan and a second fan are respectively arranged between the two ends of the gas collecting bottle and the first gas dispersing frame and between the two ends of the gas collecting bottle and the second gas dispersing frame, one end of the first gas dispersing frame, far away from the first fan, is connected with a first gas flowmeter, one end of the second gas dispersing frame, far away from the second fan, is connected with a second gas flowmeter, a thermometer and a liquid level meter are respectively arranged in the gas collecting bottle, a lake sediment sample is arranged at the bottom of the gas enrichment sample box, a water sample is arranged above the lake sediment sample in the gas enrichment sample box, a water bath heater is arranged below the gas enrichment sample box, and one side of the second gas flowmeter, which is far away from the second gas dispersing frame, is connected with a pressure gauge.
As a further description of the above technical solution:
the material of gaseous enrichment sample case is the polyethylene fat, and the junction between gaseous enrichment sample case and the gas collecting bottle is provided with the shirt rim that corresponds, arc shirt rim position between gaseous enrichment sample case and the gas collecting bottle runs through the bolt and carries out fixed connection, and shirt rim hookup location inboard is provided with silica gel sealing washer, outside seam crossing scribbles silica gel.
As a further description of the above technical solution:
the first fan is an air inlet fan, the second fan is an exhaust fan, and the wind directions of the second fan and the first fan are arranged in the same direction.
As a further description of the above technical solution:
the first air dispersing frame and the second air dispersing frame are both designed in a conical shape, and a plurality of small air passages are uniformly distributed in the first air dispersing frame and the second air dispersing frame.
As a further description of the above technical solution:
the bottom sensing end of the thermometer is connected to the lake water sample.
As a further description of the above technical solution:
all parts are communicated and butted through hoses, and the hoses are made of polytetrafluoroethylene.
As a further description of the above technical solution:
the gas enriched sample box is submerged in a water bath heater.
As a further description of the above technical solution:
one side of the pressure gauge, which is far away from the second gas flow meter, is connected with a U-shaped drying tube, and one side of the U-shaped drying tube, which is far away from the pressure gauge, is connected with a Tenax adsorbent tube.
The utility model has the following beneficial effects:
the dynamic laboratory method is used for collecting the VOCs generated by the water-air interface, mainly simulates the environment of a natural lake under the laboratory condition, is used for detecting the gas volatilized from the water surface, most of the prior devices detect the gas flux outdoors, the devices simulating the external environment under the indoor laboratory condition are few, and the water temperature and the wind speed can be changed by the devices in the laboratory, which cannot be realized under the natural environment;
meanwhile, different gas component proportions can be obtained by changing the proportion of water and bottom sediment in the cavity, different proportions of VOCs contributed by the bottom sediment and the water can be roughly calculated through simple conversion, the contribution proportion of the VOCs to the release of the VOCs in the natural lake can be obtained by placing some blue-green algae on the water surface, and meanwhile, the water temperature in the cavity can be changed through a water bath heater at the bottom, so that the influence of the temperature on the gas volatilized by the water surface can be researched;
the device is superior to other methods in that volatile organic compounds generated by a water-gas interface are measured without being influenced by Henry's law, other devices are generally closed devices, and the devices can cause pressure change of a cavity in operation, so that errors can be caused to experimental results, and the device can well avoid the situation;
the difference of VOCs volatilized from a water-gas interface can be observed by changing different environments, for example, the experimental device can be placed in a insolation place or a shady place, so that the conditions of illumination and temperature can be changed very conveniently, which is incomparable to an outdoor static box method, in addition, a double-sided aluminum foil bubble film is customized for the experimental device according to the requirement to isolate external ultraviolet rays and sunlight, the influence of the ultraviolet rays on the VOCs generated on the water surface is prevented, and the chemical reaction of the VOCs is prevented;
whole structural design retrencies, uses very nimble convenient, can adjust according to the demand at will, and adaptability is wide, and the practicality is strong, and overall structure limitation is little, can carry out the collocation experiment of different proportions, mode at will and use, and experimental data is accurate simultaneously, and experimental environment can design at will, and overall structure uses the safety and stability.
Drawings
FIG. 1 is a front view of an apparatus for collecting VOCs generated at a water-gas interface according to a dynamic laboratory method of the present invention;
FIG. 2 is a top view of an apparatus for collecting VOCs generated from a water-gas interface according to a kinetic laboratory method of the present invention.
Illustration of the drawings:
1. a gas collection bottle; 2. a gas enrichment sample box; 3. a first fan; 4. a second fan; 5. a first air dispersing frame; 6. a second air dispersing frame; 7. a first gas flow meter; 8. a thermometer; 9. a liquid level meter; 10. a lake sediment sample; 11. a lake water sample; 12. a water bath heater; 13. a second gas flow meter; 14. a pressure gauge; 15. a U-shaped drying tube; 16. tenax sorbent tubes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-2, one embodiment of the present invention is provided: a device for collecting VOCs generated by a water-gas interface in a dynamic laboratory method comprises a gas collecting bottle 1, a gas enrichment sample box 2 communicated with the bottom of the gas collecting bottle 1 is arranged at the bottom of the gas collecting bottle 1, a first air dispersing frame 5 and a second air dispersing frame 6 are arranged at the two ends of the gas collecting bottle 1, a first fan 3 and a second fan 4 are respectively arranged between the two ends of the gas collecting bottle 1 and the first air dispersing frame 5 as well as between the two ends of the gas collecting bottle 1 and the second air dispersing frame 6, one end of the first air dispersing frame 5 far away from the first fan 3 is connected with a first gas flowmeter 7, one end of the second air dispersing frame 6 far away from the second fan 4 is connected with a second gas flowmeter 13, a thermometer 8 and a liquid level meter 9 are respectively arranged in the gas collecting bottle 1, a lake bottom sediment sample 10 is arranged at the bottom of the gas enrichment sample box 2, and a lake water sample 11 is arranged above the lake sediment sample 10 in the gas enrichment sample box 2, a water bath heater 12 is arranged below the gas enrichment sample box 2, and a pressure gauge 14 is connected to one side, far away from the second gas dispersing frame 6, of the second gas flowmeter 13.
In the further scheme, the material of gaseous enrichment sample case 2 is the polyethylene fat, and the junction between gaseous enrichment sample case 2 and the gas collecting bottle 1 is provided with the shirt rim that corresponds, arc shirt rim position between gaseous enrichment sample case 2 and the gas collecting bottle 1 is through bolt penetration and is carried out fixed connection, and shirt rim hookup location inboard is provided with the silica gel sealing washer, outside seam crossing scribbles silica gel, can guarantee through the setting of structure that gaseous enrichment sample case 2 and gas collecting bottle 1 can communicate each other between, thereby conveniently carry out test work, the structure can be dismantled simultaneously and use convenience very, and the silica gel sealing washer of junction and the silica gel of seam crossing can all guarantee overall structure's leakproofness.
In the further scheme, first fan 3 is the inlet fan, and second fan 4 is exhaust fan, and second fan 4 and first fan 3's wind direction is the syntropy setting, can guarantee that whole structure can the steady operation.
In the further scheme, first gas frame 5 and the second gas frame 6 that looses are the toper design, and first gas frame 5 and the inside evenly distributed of second gas frame 6 that looses is provided with a plurality of little air flues, and the setting up through the structure firstly is in order to let the surface of water volatilize the abundant mixture of gas and carrier gas, and secondly is smooth and easy for the gas flow in the air flue, can not produce the torrent in the air chamber.
In the further scheme, the bottom sensing end of the thermometer 8 is connected to the lake water sample 11, and the water temperature condition can be stably monitored through the structure, so that the aim of accurate control can be fulfilled.
In the further scheme, all communicate the butt joint through the hose between each part, the material of hose is polytetrafluoroethylene, and the hose of polytetrafluoroethylene material has excellent corrosion resistance, is the material of low surface area, and it has chemical inertia, can adsorb VOCs hardly, can reduce the influence of pipeline to the experimental result as far as, promotes the accurate nature of experimental data.
In the further scheme, the gas enrichment sample box 2 sinks into the water bath heater 12, and the uniformity and the comprehensiveness of heating can be guaranteed through the sinking arrangement, so that the accuracy of experimental data is guaranteed.
In the further scheme, one side that second gas flowmeter 13 was kept away from to pressure gauge 14 is connected with U type drying tube 15, one side that pressure gauge 14 was kept away from to U type drying tube 15 is connected with Tenax adsorbent pipe 16, it has a large amount of steam to dope in the gas that volatilizees, the drying tube can effective filtration steam, thereby reduce a large amount of steam and lead to the fact the influence to the testing result, Tenax adsorption tube set up can make things convenient for after the follow-up VOCs that adsorbs, after thermal desorption instrument, connect the content of various VOCs of gas chromatography mass spectrometry GC-MS survey.
The working principle is as follows: when the device for collecting VOCs generated by a water-gas interface by using a dynamic laboratory method is used, firstly, a screw at the connecting position between a gas collecting bottle 1 and a gas enrichment sample box 2 is unscrewed, an inner cavity is opened, a lake water sample 11 to be tested is added into the inner cavity, meanwhile, part of a lake sediment sample 10 can be added into the cavity according to requirements, after the addition is finished, the screw is screwed down to seal the whole structure, a knob of a carrier gas device is opened, a fan is started, a pressure gauge 14 records the pressure of an air passage, a gas flowmeter records the flow rate of gas, a thermometer 8 records the temperature of water, the waiting time is five minutes, whether the pressure flow rate and the temperature of the water are in a stable state or not is observed, and meanwhile, in order to empty irrelevant gas in a pipeline, an adsorption pipe can be connected at the moment, the sampling work can be carried out, and then the pressure, the temperature and the flow rate are recorded every ten minutes, after the device is operated for one hour, the adsorption tube is taken down, a new adsorption tube is replaced, the equipment is operated for two hours again, then the adsorption tube is taken down again, a new adsorption tube is installed again, the equipment is operated for three hours, the like is performed, the equipment is operated for four hours next time, then a water sample at the same position is replaced, the same experiment is performed again, the operation experiment is repeated for several times, so that the experiment results of several times are obtained, the contents of olefin, alkane and aromatic hydrocarbon are obtained from the experiment results of several times, and then the gas flux of the VOCs can be obtained according to the following formula:
where F is the gas flux, where c1, c2 are t1, the gas concentration at time t2, t is the time interval t2-t1, h is the height of the tank above the liquid level, and Vm is the molar volume of the gas.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (8)
1. A device for collecting VOCs generated at a water-gas interface in a dynamic laboratory process, comprising a gas collection bottle (1), characterized in that: the bottom of the gas collecting bottle (1) is provided with a gas enrichment sample box (2) communicated with each other, the two ends of the gas collecting bottle (1) are respectively provided with a first gas dispersing frame (5) and a second gas dispersing frame (6), a first fan (3) and a second fan (4) are respectively arranged between the two ends of the gas collecting bottle (1) and the first gas dispersing frame (5) and between the two ends of the gas collecting bottle (1) and the second gas dispersing frame (6), one end of the first gas dispersing frame (5), far away from the first fan (3), is connected with a first gas flowmeter (7), one end of the second gas dispersing frame (6), far away from the second fan (4), is connected with a second gas flowmeter (13), a thermometer (8) and a liquid level meter (9) are respectively arranged in the gas collecting bottle (1), the bottom of the gas enrichment sample box (2) is provided with a bottom lake sediment sample (10), and a water sample (11) is arranged above the lake bottom sediment sample (10) in the gas enrichment sample box (2), a water bath heater (12) is arranged below the gas enrichment sample box (2), and one side, far away from the second gas dispersing frame (6), of the second gas flowmeter (13) is connected with a pressure gauge (14).
2. The device of claim 1 for collecting VOCs generated from a water-air interface, comprising: the material of gaseous enrichment sample case (2) is the polyethylene fat, and the junction between gaseous enrichment sample case (2) and gas collecting bottle (1) is provided with the shirt rim that corresponds, arc shirt rim position between gaseous enrichment sample case (2) and gas collecting bottle (1) runs through the bolt and carries out fixed connection, and shirt rim hookup location inboard is provided with silica gel sealing washer, outside seam crossing scribbles silica gel.
3. The device of claim 1 for collecting VOCs generated from a water-air interface, comprising: the first fan (3) is an air inlet fan, the second fan (4) is an air outlet fan, and the wind directions of the second fan (4) and the first fan (3) are arranged in the same direction.
4. The device of claim 1 for collecting VOCs generated from a water-air interface, comprising: the first air dispersing frame (5) and the second air dispersing frame (6) are both in a conical design, and a plurality of small air passages are uniformly distributed in the first air dispersing frame (5) and the second air dispersing frame (6).
5. The device of claim 1 for collecting VOCs generated from a water-air interface, comprising: the bottom sensing end of the thermometer (8) is connected to the lake water sample (11).
6. The device of claim 1 for collecting VOCs generated from a water-air interface, comprising: all parts are communicated and butted through hoses, and the hoses are made of polytetrafluoroethylene.
7. The device of claim 1 for collecting VOCs generated from a water-air interface, comprising: the gas-enriched sample tank (2) is immersed in a water bath heater (12).
8. The device of claim 1 for collecting VOCs generated from a water-air interface, comprising: one side of the pressure gauge (14) far away from the second gas flowmeter (13) is connected with a U-shaped drying pipe (15), and one side of the U-shaped drying pipe (15) far away from the pressure gauge (14) is connected with a Tenax adsorbent pipe (16).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122363454.3U CN215985387U (en) | 2021-09-28 | 2021-09-28 | Device for collecting VOCs (volatile organic compounds) generated on water-gas interface by dynamic laboratory method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116990089A (en) * | 2023-07-31 | 2023-11-03 | 珠海深圳清华大学研究院创新中心 | Monitoring device and method for directly discharging sewage greenhouse gases |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116990089A (en) * | 2023-07-31 | 2023-11-03 | 珠海深圳清华大学研究院创新中心 | Monitoring device and method for directly discharging sewage greenhouse gases |
| CN116990089B (en) * | 2023-07-31 | 2024-03-12 | 珠海深圳清华大学研究院创新中心 | Monitoring device and method for directly discharging sewage greenhouse gases |
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