CN109794162B - Indoor volatile organic compound removing device based on thermal desorption and cold extraction - Google Patents
Indoor volatile organic compound removing device based on thermal desorption and cold extraction Download PDFInfo
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- CN109794162B CN109794162B CN201910067472.1A CN201910067472A CN109794162B CN 109794162 B CN109794162 B CN 109794162B CN 201910067472 A CN201910067472 A CN 201910067472A CN 109794162 B CN109794162 B CN 109794162B
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Abstract
The invention discloses an indoor volatile organic matter removing device based on thermal desorption and cold extraction, which comprises a roller supporting unit, a thermal desorption unit, a cooling extraction unit and a nano adsorption degradation unit, wherein the roller supporting unit is provided with a plurality of rollers; the roller supporting unit is used for loading the solid-phase extraction coating and providing rotating power; the thermal desorption unit is used for heating the sample and promoting the desorption of volatile organic pollutants in the sample; the cooling extraction unit is used for keeping the extraction fiber coating at a lower temperature by injecting liquid carbon dioxide and increasing the extraction amount of the solid phase extraction coating on volatile organic compounds; and the nano adsorption and degradation unit is used for extracting organic pollutants volatilized by the sample, so that the volatile organic pollutants in the indoor wall can be quickly removed. The invention has the comprehensive effects of intelligent control, cyclic utilization, effective treatment of indoor volatile organic pollutants and beautification of living environment.
Description
Technical Field
The invention relates to indoor environment purification, in particular to an indoor volatile organic matter removing device based on thermal desorption and cold extraction.
Background
The continuous large-scale development of building real estate, with the attendant large scale house decoration, has resulted in increased indoor pollution. According to the data, 68% of human diseases are related to the pollution of living rooms, and formaldehyde is an important indoor pollutant. The furniture, plates, carpets, coatings and even adhesives which are inevitably used in home decoration all use formaldehyde as the components, and the long-term contact with low-dose formaldehyde can cause various diseases such as chronic respiratory diseases, juvenile memory intelligence decline, fetal deformity, cancer and the like. If the indoor temperature is about 22 degrees, the formaldehyde emission of the detected family is mostly in a critical value state. Once the room temperature exceeds 28 ℃, the formaldehyde emission is multiplied. Therefore, some more stubborn environmental pollution in the summer house decoration process can be removed more quickly along with the increase of the release amount, and the indoor air pollution treatment is more suitable.
In order to remove formaldehyde, in the prior art, the first scheme is as follows: the active carbon is utilized, but has the following defects that the aldehyde removal period of the active carbon is only about 20 days, and the active carbon is in a saturated state after 20 days, does not have the adsorption capacity any more, cannot effectively adsorb formaldehyde, and has the danger of secondary release; scheme II: the photocatalyst is utilized, but has the following defects that the dependence on ultraviolet rays is extremely high, the normal sunshine irradiation cannot reach the oxidation promotion standard, and particularly, the photocatalyst basically does not have the aldehyde removal capability at night; the third scheme is as follows: the air purifier is used, but has the following defects that the air purifier relies on an active carbon filter screen for removing aldehyde, has the same problems as the active carbon, has short aldehyde removing time, is easy to saturate, and can not avoid the rebound of formaldehyde.
The existing formaldehyde removal technology is mainly used for removing volatilized formaldehyde, no method for removing formaldehyde latent in a wall is seen, and the harm to a human body caused by long-term slow volatilization of formaldehyde latent in the wall is easier to ignore. Therefore, the technology mainly aims at removing formaldehyde hidden inside the wall.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a device for removing indoor volatile organic pollutants based on thermal desorption and cold extraction
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an indoor volatile organic pollutant remove device which characterized in that: comprises a roller supporting unit, a thermal desorption unit, a cooling extraction unit and a nanometer adsorption degradation unit;
the roller supporting unit is used for loading the solid-phase extraction coating;
the thermal desorption unit is used for heating the sample and promoting the desorption of volatile organic pollutants in the sample;
the cooling extraction unit is used for keeping the extraction fiber coating at a lower temperature by injecting liquid carbon dioxide and increasing the extraction amount of the solid phase extraction coating on volatile organic compounds;
the nanometer adsorption and degradation unit is used for extracting and absorbing organic pollutants volatilized by the sample, so that the volatile organic pollutants in the indoor wall can be quickly removed.
The utility model provides an indoor volatile organic compounds remove device based on thermal desorption and cold extraction which characterized in that: comprises a roller, a composite roller bearing, a heating rod, a liquid carbon dioxide steel cylinder, an inner cooling pipe, a photocatalyst/active carbon-electrospun nanofiber composite coating and a nanofiber extraction sleeve;
the drum is of a cylindrical structure with a U-shaped section, the nanofiber extraction sleeve is detachably sleeved and connected on the inner wall of the drum, and the inner wall of the nanofiber extraction sleeve is provided with a photocatalyst/active carbon-electrospun nanofiber composite coating;
an inner cooling pipe is arranged in the nanofiber extraction sleeve through a plurality of groups of composite roller bearings,
the inner cooling pipe is positioned in the middle of each group of composite roller bearings and is used for keeping the inner cooling pipe still through the composite roller bearings in the rotating process of the nanofiber extraction sleeve following the roller;
the inlet end of the inner cooling pipe is communicated with the outlet of the liquid carbon dioxide steel cylinder through a pipeline, and the outlet end of the inner cooling pipe is positioned in the nanofiber extraction sleeve and is used for injecting liquid carbon dioxide into the nanofiber extraction sleeve through the inner cooling pipe, so that the photocatalyst/active carbon-electrospun nanofiber composite coating keeps a lower temperature, and the extraction amount of the photocatalyst/active carbon-electrospun nanofiber composite coating on volatile organic matters is increased;
and a heating rod is arranged around the roller and used for heating the periphery of the roller.
Furthermore, each group of composite roller bearings is four composite roller bearings, and the inner cooling pipe is positioned between the four composite roller bearings; the inner cooling pipe is positioned at the central axis of the nanofiber extraction sleeve. Each group of composite roller bearings can rotate freely.
Further, the indoor volatile organic compound removing device for thermal desorption and cold extraction is characterized in that: still include temperature sensor, install temperature sensor around the cylinder, temperature sensor and temperature detect switch signal connection set for required invariable temperature through temperature detect switch. Further, the temperature sensor is arranged at a position between the roller and the nanofiber extraction sleeve.
Further, the indoor volatile organic compound removing device for thermal desorption and cold extraction is characterized in that: the handle is fixedly connected with the roller and used for providing power for the rotation of the roller. More preferably, the handle is made of stainless steel and is covered with a rubber film.
Further, the heating rod comprises a steel pipe and a heating wire, and the heating wire is located inside the steel pipe.
Furthermore, the heating wire is connected with a power supply through an electric wire and a power supply connector, and a temperature control switch is arranged on the electric wire.
Further, the heat insulation support is further included; the heating rod is fixed around the roller through a heat insulation support.
Furthermore, more than three heating rods are uniformly arranged around the roller.
Furthermore, the device for removing volatile organic compounds through thermal desorption and cold extraction is characterized by further comprising a pressure reducing valve and a hose, wherein the liquid carbon dioxide steel cylinder is connected with the inner cooling pipe through the pressure reducing valve and the hose, and liquid carbon dioxide is injected into the inner cooling pipe under the action of the pressure reducing valve.
More preferably, the indoor volatile organic compound removing device for thermal desorption and cold extraction is characterized in that: the hose cooling device further comprises a sealing sleeve, and the sealing sleeve is arranged at the joint of the hose and the inner cooling pipe.
Further, the indoor volatile organic compound removing device for thermal desorption and cold extraction is characterized in that: the opening end of the nanofiber extraction sleeve is communicated with an exhaust pipe for exhausting gaseous carbon dioxide.
Preferably, the inner cooling pipe is made of stainless steel.
Furthermore, the opening end of the roller is provided with a sealing cover matched with the roller.
Further, the preparation method of the photocatalyst/active carbon-electrospun nanofiber composite coating on the nanofiber extraction sleeve comprises the following steps: taking polyvinyl chloride (PVC) and Polystyrene (PS) as matrixes, preparing an organic solvent from N, N-dimethyl formamide (DMF) and Tetrahydrofuran (THF) according to the volume ratio of 3:1, weighing 0.2-1.5 g of polyvinyl chloride (PVC) and Polystyrene (PS) powder, dissolving the polyvinyl chloride (PVC) and Polystyrene (PS) powder in the prepared organic solvent of 1.0-3.0 mL, stirring the mixture at room temperature for more than 1h by magnetic stirring (3000 rad/min), fully and uniformly mixing the solution, and heating the mixture at constant temperature of below 60 ℃ to accelerate the dissolving speed of the mixture to obtain a uniform and clear viscous electrospinning solution;
putting the electrospinning solution into a 5 mL injection propeller, installing a capillary metal needle point, connecting a solution propulsion pump and a high-voltage power supply, wherein the solution propulsion speed is 0-3.0 mL/h, electrospinning by using an FM-1107 electrostatic spinning instrument, the voltage of a positive electrode is 1-30 KV, the voltage of a negative electrode is-5-0 KV, the receiving distance is 1-20 cm, and preparing an electrospinning nanofiber membrane (NF); then adopting an electrospray technology to deposit photocatalyst (P) and active carbon (C) on the surface of the electrospun nanofiber membrane (NF) layer by layer to obtain a ternary composite material, and preparing the material into a coating and attaching the coating on the nanofiber extraction sleeve by alternately electrospinning and functionalizing.
Preferably, the indoor volatile organic pollutant removing device is characterized in that: the nano adsorption degradation unit adopts a photocatalyst/active carbon-electrospun nanofiber composite coating, combines the mechanism of photocatalytic decomposition of the photocatalyst with the mechanism of physical adsorption and formaldehyde removal of the active carbon, and removes formaldehyde by the active carbon through physical adsorption under the condition of no illumination; under the illumination condition, the photocatalyst catalyzes the formaldehyde decomposition and realizes the regeneration of the active carbon. The electrospun nanofiber with high specific surface area is used as an active carbon/photocatalyst carrier, so that the contact area of the material and air can be increased, and the material is convenient to take and use; and the preparation method is simple.
Furthermore, the roller is made of toughened glass, so that the device can transmit light to promote photocatalyst catalytic decomposition on the composite coating.
Has the advantages that: the device for removing the volatile organic compounds including formaldehyde and toluene based on the combination of the mechanism of photocatalytic decomposition by photocatalyst and the mechanism of physical adsorption of the volatile organic compounds by activated carbon can obviously remove the residual formaldehyde after indoor decoration, recycles materials and saves cost, and compared with the prior art, the device has the obvious advantages that:
(1) the operation is simple, and an extraction solution is not needed;
(2) quickly removing formaldehyde, methylbenzene and the like in walls and floors in a short time;
(3) the extraction and adsorption materials are repeatedly used, so that the cost is saved;
(4) the adopted extraction material combines the advantages of activated carbon and photocatalyst to absorb formaldehyde, and the formaldehyde removing effect is more obvious.
Drawings
FIG. 1 is a schematic view of an indoor VOCs removal apparatus according to an embodiment;
FIG. 2 is a side view of the drum in the embodiment;
in the figure: the device comprises a roller 1, a handle 2, a composite roller bearing 3, a heating rod 4, a heat insulation support 5, a power supply connector 6, an electric wire 7, a temperature control switch 8, a temperature sensor 9, a liquid carbon dioxide steel cylinder 10, a pressure reducing valve 11, an inner cooling pipe 12, a sealing sleeve 13, a hose 14, a steel pipe 15, an exhaust pipe 16, a photocatalyst/active carbon-electrospinning nanofiber composite coating 17 and a nanofiber extraction sleeve 18.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1 and 2, an indoor volatile organic compound removal device based on thermal desorption and cold extraction comprises a roller supporting unit, a thermal desorption unit, a cooling extraction unit and a nano adsorption degradation unit;
the roller supporting unit is used for loading the solid-phase extraction coating, controlling the roller to rotate and enhancing the adsorption effect;
the thermal desorption unit comprises a heating rod 4, and a heat source is provided for heating the sample to promote the extraction of the volatile organic pollutants;
the cooling extraction unit comprises a liquid carbon dioxide steel bottle 10 which is used for absorbing heat to manufacture a low-temperature environment by the liquid carbon dioxide, and forms a temperature gradient with a heat source provided by the heating rod 4, thereby being beneficial to the extraction of volatile organic compounds such as formaldehyde and the like. The device is used for keeping the temperature of the extraction fiber coating at a lower temperature by injecting liquid carbon dioxide and increasing the extraction amount of the solid phase extraction coating to volatile organic compounds;
the nanometer adsorption and degradation unit is used for absorbing volatile organic pollutants of the sample, so that the removal of the indoor volatile organic pollutants is realized. The device is used for extracting and absorbing organic pollutants volatilized from the sample, so that the volatile organic pollutants in the indoor wall can be quickly removed.
In some embodiments, as shown in fig. 1, 2, the roller support unit comprises a roller 1, a handle 2, a compound roller bearing 3;
the thermal desorption unit comprises a heating rod 4, a heat insulation support 5, a power supply connector 6, an electric wire 7, a temperature control switch 8 and a temperature sensor 9;
the cooling extraction unit comprises a liquid carbon dioxide steel bottle 10, a pressure reducing valve 11, an inner cooling pipe 12, a composite roller bearing 3, a sealing sleeve 13, a hose 14, a steel pipe 15 and an exhaust pipe 16;
the nano adsorption degradation unit comprises a photocatalyst/active carbon-electrospun nanofiber composite coating 17 and a nanofiber extraction sleeve 18;
in some embodiments, as shown in fig. 1 and fig. 2, an indoor volatile organic compound removing apparatus based on thermal desorption and cold extraction includes a roller 1, a composite roller bearing 3, a heating rod 4, a liquid carbon dioxide steel cylinder 10, an inner cooling tube 12, a photocatalyst/activated carbon-electrospun nanofiber composite coating 17, and a nanofiber extraction sleeve 18;
the roller 1 is of a cylindrical structure with a U-shaped section, the nanofiber extraction sleeve 18 is detachably sleeved and connected on the inner wall of the roller 1, and the inner wall of the nanofiber extraction sleeve 18 is provided with a photocatalyst/active carbon-electrospun nanofiber composite coating 17;
an inner cooling pipe 12 is arranged in the nanofiber extraction sleeve 18 through a plurality of groups of composite roller bearings 3,
the inner cooling pipe 12 is positioned in the middle of each group of composite roller bearings 3 and is used for keeping the inner cooling pipe 12 still through the composite roller bearings 3 in the process that the nanofiber extraction sleeve 18 rotates along with the roller 1;
the inlet end of the inner cooling tube 12 is communicated with the outlet of the liquid carbon dioxide steel cylinder 10 through a pipeline, and the outlet end of the inner cooling tube 12 is positioned in the nanofiber extraction sleeve 18 and is used for injecting liquid carbon dioxide into the nanofiber extraction sleeve 18 through the inner cooling tube 12, so that the photocatalyst/active carbon-electrospun nanofiber composite coating 17 is kept at a lower temperature, and the extraction amount of the photocatalyst/active carbon-electrospun nanofiber composite coating 17 on volatile organic compounds is increased;
and a heating rod 4 is arranged around the roller 1 and used for heating the device in the roller 1.
The roller 1 is used for bearing the nanofiber extraction sleeve 18 and protecting the photocatalyst/active carbon-electrospun nanofiber composite coating 17.
Furthermore, each group of composite roller bearings 3 is four composite roller bearings 3 with equal intervals, and the inner cooling pipe 12 is positioned between the four composite roller bearings 3; the inner cooling tube 12 is positioned at the central axis of the nanofiber extraction sleeve 18. Each set of composite roller bearings 3 can rotate freely. The inner cooling pipe 12 and the composite roller bearings 3 are arranged in the roller, and the four composite roller bearings 3 can rotate freely; during the rotation of the nanofiber extraction sleeve 18 along with the roller 1, the inner cooling pipe 12 is kept still under the action of the composite roller bearing 3.
Furthermore, the composite roller bearing 3 is compressed and clamped on the shaft by depending on the radial size of the inner hole of the withdrawal sleeve, and the withdrawal sleeve is provided with a special nut, so that the bearing is convenient to assemble and disassemble, and the nanofiber extraction sleeve 18 is convenient to disassemble.
Further, the handle 2 is fixedly connected to the roller 1 and used for providing power for the rotation of the roller 1. Preferably, the handle 2 is connected to the closed end of the drum 1. Shaking the handle can rotate the roller, thereby enhancing the adsorption effect. Preferably, the handle is made of stainless steel and is sleeved with a rubber membrane.
Further, the heating rod 4 is arranged around the roller 1 in a matching way, and a heat insulation support 5 for heat insulation is also sandwiched between the heating rod and the roller; the heating rod 4 is fixed around the drum 1 by a heat insulating support 5. Further, more than three heating rods 4 are uniformly arranged around the roller 1.
Further, still include temperature sensor 9, install temperature sensor 9 around the cylinder 1, temperature sensor 9 and temperature detect switch 8 signal connection, set for required invariable temperature through temperature detect switch 8. Can be used to adjust the required constant temperature to suit different sample materials. And adjusting the corresponding temperature on the temperature control switch according to the sample material. Furthermore, the temperature sensor is arranged between the roller and the nanofiber extraction sleeve, or on the outer wall of the roller in the circumferential direction, or on the nanofiber extraction sleeve.
The heating rod 4 comprises a steel pipe 15 and a heating wire, and the heating wire is positioned inside the steel pipe 15. The heating wire is connected with a power supply through an electric wire 7 and a power supply connector 6, so that the heating rod 4 is heated, the temperature is increased, and the extraction of organic matters is promoted; and a temperature control switch 8 is arranged on the electric wire 7.
The liquid carbon dioxide steel cylinder 10 is connected with the inner cooling pipe 12 through a pressure reducing valve 11, a hose 14 and the inner cooling pipe 12, liquid carbon dioxide is injected into the inner cooling pipe 12 under the action of the pressure reducing valve 11, the liquid carbon dioxide is vaporized to absorb heat to reduce the temperature of the photocatalyst/active carbon-electrospun nanofiber composite coating 17, and the extraction amount of the photocatalyst/active carbon-electrospun nanofiber composite coating 17 on volatile organic compounds is increased.
Furthermore, a sealing sleeve 13 is sleeved at the joint of the hose 14 and the inner cooling pipe 12.
Further, the device also comprises an exhaust pipe 16, and the open end of the nanofiber extraction sleeve 18 is also communicated with the exhaust pipe 16 for exhausting gaseous carbon dioxide.
The hose 14 is made of rubber, the inner cooling pipe 12 is made of stainless steel materials and used for passing liquid carbon dioxide, and the long metal inner cooling pipe is excellent in heat conduction performance, beneficial to full vaporization of the liquid carbon dioxide in the pipe, capable of absorbing a large amount of heat and easy to cool the composite coating.
Further, the opening end of the roller 1 is provided with a matched sealing cover. The nanofiber extraction sleeve 18 is sealed in the roller 1, and a through hole for the inner cooling pipe 12 and the exhaust pipe 16 to pass through is formed in the sealing cover.
The thermal desorption unit enables air mixed with indoor volatile organic compounds and carbon dioxide to rapidly enter the device to be fully heated under the heating condition, the heat insulation support 5 is connected with the steel pipe 15 of the heating rod 4 and the nanofiber extraction sleeve 18 to manufacture a headspace heat environment, the power supply connector 6 is connected with a power supply, the electric wire 7 provides a lead to connect a heating wire, the temperature of the headspace heat environment is rapidly increased, and heat is conducted to the headspace environment between the heating rod 4 and the photocatalyst/active carbon-electrospun nanofiber composite coating 17 through the steel pipe 15.
Further, the hose 14 is used for providing a passage for carbon dioxide and air to enter the device, and the hose provides a base for liquid carbon dioxide to adhere to, so as to facilitate the sufficient mixing of air and carbon dioxide, and the pressure reducing valve 11 is mounted on the hose 14 and is used for creating a pressure difference to rapidly absorb air containing volatile organic compounds and carbon dioxide.
In this example, before the handle 2 is swung, the power connector 6 is plugged in, the desired constant temperature is adjusted on the temperature-dependent switch 8, the device is preheated, and then the pressure-reducing valve 11 is opened to suck in air. And attention is paid to the ventilation of the window during the use of the device, so as to prevent the concentration of carbon dioxide from being too high.
The preparation method of the photocatalyst/active carbon-electrospun nanofiber composite coating 17 on the nanofiber extraction sleeve 18 comprises the following steps: taking polyvinyl chloride (PVC) and Polystyrene (PS) as matrixes, preparing an organic solvent from N, N-dimethyl formamide (DMF) and Tetrahydrofuran (THF) according to the volume ratio of 3:1, weighing 0.2-1.5 g of polyvinyl chloride (PVC) and Polystyrene (PS) powder, dissolving the polyvinyl chloride (PVC) and Polystyrene (PS) powder in the prepared organic solvent of 1.0-3.0 mL, stirring the mixture at room temperature for more than 1h by magnetic stirring (3000 rad/min), fully and uniformly mixing the solution, and heating the mixture at constant temperature of below 60 ℃ to accelerate the dissolving speed of the mixture to obtain a uniform and clear viscous electrospinning solution;
putting the electrospinning solution into a 5 mL injection propeller, installing a capillary metal needle point, connecting a solution propulsion pump and a high-voltage power supply, wherein the solution propulsion speed is 0-3.0 mL/h, electrospinning by using an FM-1107 electrostatic spinning instrument, the voltage of a positive electrode is 1-30 KV, the voltage of a negative electrode is-5-0 KV, the receiving distance is 1-20 cm, and preparing an electrospinning nanofiber membrane (NF); then, by adopting an electrospray technology, the photocatalyst (P) and the active carbon (C) are deposited on the surface of the electrospun nanofiber membrane (NF) layer by layer to obtain a ternary composite material, and the material is prepared into a coating to be attached to the nanofiber extraction sleeve 18 through alternate electrospinning and functionalization, so that volatile organic compounds including formaldehyde and toluene are absorbed.
By manufacturing the nanofiber extraction sleeve 18 into the upper detachable part and the lower detachable part, the nanofiber extraction sleeve can be conveniently detached to be removed in a high-temperature environment for uniform removal after absorbing a certain amount of volatile organic compounds to reach saturation.
The thermal desorption unit and the cooling extraction unit act together, a large amount of heat is absorbed by the liquid carbon dioxide, the heat in the roller 1 is absorbed by the inner cooling pipe 12, the temperature of the photocatalyst/active carbon-electrospun nanofiber composite coating 17 carried by the nanofiber extraction sleeve 18 is reduced, the extraction amount of the photocatalyst/active carbon-electrospun nanofiber composite coating 17 to volatile organic compounds is increased at low temperature, and at the moment, even if the sample is heated to high temperature, the fiber coating can keep low temperature.
Furthermore, the steel pipe 15 is heated by the heating rod 4 at a high temperature, a headspace thermal environment is manufactured by excellent heat conductivity of metal, a temperature gradient is formed between the cooled fiber coating and the hot headspace, the distribution coefficient of the sample gas on the extraction head is greatly improved, and volatile organic compounds such as formaldehyde in the mixed gas can be extracted more easily.
The specific operation steps of the present invention are further described below with reference to fig. 1 and 2:
the invention provides an indoor volatile organic compound removing device based on pyrolysis and cold extraction.
The method comprises the following steps: the connection device shown in fig. 1 was connected to a power supply and set to a constant temperature.
Step two: opening the pressure reducing valve 11 to inject liquid carbon dioxide, simultaneously shaking the handle 2 to drive the roller 1 and the nanofiber extraction sleeve 18 to rotate, and keeping the inner cooling pipe 12 still, wherein each group of composite roller bearings 3 rotates.
Step three: after heating for about 3-5 minutes, the power is turned off to lower the temperature inside the apparatus. The handle is continuously shaken to ensure that the extract is fully contacted with the extraction sleeve.
Step four: after the extraction is completed, gaseous carbon dioxide is discharged through the exhaust pipe 16.
Step five: and (3) disassembling the nanofiber extraction sleeve, sealing and storing at low temperature, finally uniformly removing volatile organic matters such as formaldehyde at high temperature, cleaning the device, and recycling.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (9)
1. An indoor volatile organic compound removing device is characterized in that: comprises a roller, a composite roller bearing, a heating rod, a liquid carbon dioxide steel cylinder, an inner cooling pipe, a photocatalyst/active carbon-electrospun nanofiber composite coating and a nanofiber extraction sleeve;
the drum is of a cylindrical structure with a U-shaped section, the nanofiber extraction sleeve is detachably sleeved and connected on the inner wall of the drum, and the inner wall of the nanofiber extraction sleeve is provided with a photocatalyst/active carbon-electrospun nanofiber composite coating;
an inner cooling pipe is arranged in the nanofiber extraction sleeve through a plurality of groups of composite roller bearings,
the inner cooling pipe is positioned in the middle of each group of composite roller bearings and is used for keeping the inner cooling pipe still through the composite roller bearings in the rotating process of the nanofiber extraction sleeve following the roller;
the inlet end of the inner cooling pipe is communicated with the outlet of the liquid carbon dioxide steel cylinder through a pipeline, and the outlet end of the inner cooling pipe is positioned in the nanofiber extraction sleeve and is used for injecting liquid carbon dioxide into the nanofiber extraction sleeve through the inner cooling pipe, so that the photocatalyst/active carbon-electrospun nanofiber composite coating keeps a lower temperature, and the extraction amount of the photocatalyst/active carbon-electrospun nanofiber composite coating on volatile organic matters is increased;
a heating rod is arranged around the roller and used for heating the periphery of the roller;
the preparation method of the photocatalyst/active carbon-electrospun nanofiber composite coating on the nanofiber extraction sleeve comprises the following steps: preparing an organic solvent from polyvinyl chloride and polystyrene serving as matrixes and N, N-dimethyl formamide and tetrahydrofuran according to a certain volume ratio, weighing a proper amount of polyvinyl chloride and polystyrene, dissolving the polyvinyl chloride and the polystyrene in the prepared organic solvent, and uniformly dissolving and stirring to obtain a clear viscous electrospinning solution;
putting the electrospinning solution into an injection propeller, installing a capillary metal needle point, connecting a solution propelling pump and a high-voltage power supply, and electrospinning by using an electrostatic spinning instrument to prepare an electrospinning nanofiber membrane; then depositing photocatalyst and active carbon on the surface of the electrospun nanofiber membrane layer by adopting an electrospray method to obtain a ternary composite material;
and preparing the ternary composite material into a photocatalyst/active carbon-electrospun nanofiber composite coating and attaching the photocatalyst/active carbon-electrospun nanofiber composite coating to the nanofiber extraction sleeve by alternately electrospinning and functionalizing.
2. The indoor volatile organic compound removal apparatus according to claim 1, wherein: the inner cooling pipe is positioned at the central axis of the nanofiber extraction sleeve; each group of composite roller bearings is four composite roller bearings, and the inner cooling pipe is positioned between the four composite roller bearings;
and/or the opening end of the roller is provided with a matched sealing cover;
and/or the outlet end of the inner cooling pipe is positioned at the bottom end of the nanofiber extraction sleeve;
and/or the inner cooling pipe is made of stainless steel.
3. The indoor volatile organic compound removal apparatus according to claim 1, wherein: the handle is fixedly connected with the roller and used for providing power for the rotation of the roller.
4. The indoor volatile organic compound removal apparatus according to claim 1, wherein: still include temperature sensor, install temperature sensor around the cylinder, temperature sensor and temperature detect switch signal connection set for required invariable temperature through temperature detect switch.
5. The indoor volatile organic compound removing apparatus according to claim 1, wherein the heating rod includes a steel pipe and a heating wire, the heating wire being located inside the steel pipe; the heating wire is connected with a power supply through an electric wire and a power supply connector, and a temperature control switch is arranged on the electric wire;
and/or more than three heating rods are uniformly arranged around the roller.
6. The indoor volatile organic compound removal apparatus according to claim 1, wherein: the heat insulation support is also included; the heating rod is fixed around the roller through a heat insulation support.
7. The indoor volatile organic compound removing device according to claim 1, further comprising a pressure reducing valve and a hose, wherein the liquid carbon dioxide steel cylinder is connected with the internal cooling pipe through the pressure reducing valve and the hose, and the liquid carbon dioxide is injected into the internal cooling pipe through the action of the pressure reducing valve.
8. The indoor volatile organic compound removal apparatus according to claim 7, wherein: the hose cooling device further comprises a sealing sleeve, and the sealing sleeve is arranged at the joint of the hose and the inner cooling pipe.
9. The indoor volatile organic compound removal apparatus according to claim 1, wherein: the opening end of the nanofiber extraction sleeve is communicated with an exhaust pipe for exhausting gaseous carbon dioxide.
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