CN112007199A - Air purification system of elevator car - Google Patents
Air purification system of elevator car Download PDFInfo
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- CN112007199A CN112007199A CN202010939618.XA CN202010939618A CN112007199A CN 112007199 A CN112007199 A CN 112007199A CN 202010939618 A CN202010939618 A CN 202010939618A CN 112007199 A CN112007199 A CN 112007199A
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
- A61L9/18—Radiation
- A61L9/20—Ultraviolet radiation
- A61L9/205—Ultraviolet radiation using a photocatalyst or photosensitiser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0032—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions using electrostatic forces to remove particles, e.g. electret filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/007—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 by irradiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Biomedical Technology (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
The invention relates to an air purification system of an elevator car, which comprises an elevator shaft, the elevator car which is arranged in the elevator shaft and moves up and down along the elevator shaft, and an air conditioner which is arranged outside the top of the elevator car, and further comprises: the air conditioner comprises a car, a purification device, a control device and a control device, wherein the purification device is arranged on the top of the car and comprises an air inlet, an air outlet and a purification filter screen arranged between the air inlet and the air outlet; the sterilizing device is arranged on the outer side wall of the car and comprises a shell, an ultraviolet light source with the wavelength lower than 388nm is arranged on one side wall in the shell, a photocatalytic plate is arranged in the shell, and a plurality of vent holes are formed in the upper surface and the lower surface of the shell; the outside lateral wall of car is provided with the reflector layer for ultraviolet ray among the reflection sterilizing equipment makes the ultraviolet ray can not get into inside the car.
Description
Technical Field
The invention relates to the field of ventilation, in particular to an air purification system of an elevator car.
Background
The elevator has the characteristics of small space, large personnel density, complex conditions of users, poor air mobility and the like, so far, an ideal elevator air disinfection and purification instrument is lacked, and the poor air mobility in the elevator car can become a place for disease propagation and cause harm to public health. During viral epidemics, especially during new corona virus epidemics, air quality in elevators has become one of the public concerns. There is a greater concern about the quality of the air in elevators. The effective disinfection and purification of air in elevators has become a serious problem that we must face. In particular, the air sterilization and purification problems in a relatively closed environment are that the air sterilization is reliable in sterilization effect, the sterilization time is not too long, and the sterilization method or the medicament cannot cause damage to articles or personnel. Meanwhile, the air purifier not only effectively disinfects air, but also removes toxic and harmful substances in air, and is also a main content of air purification. Therefore, the research on a quick elevator air disinfection and purification product which has reliable air disinfection and purification effect, no damage to the elevator and no harm to human bodies is urgent, and the important social benefit and the potential economic benefit are very obvious.
At present, national standards of air parameters in the car are not established in China, car ventilation modes adopted by elevator manufacturers are different, and the mode that a cross flow fan at the top of the car takes air from a hoistway and then the gap of the car or an air outlet at the bottom of the car exhausts the air to the hoistway is commonly adopted in elevator car ventilation. Poor ventilation effect in the car is easily caused in the actual use process, and the spread of diseases cannot be prevented. At present, an air conditioner is generally installed in an elevator, and the comfort of the fluid and the temperature of the air in a car is realized by utilizing the air flow exchange of the air conditioner. In order to further purify the air, the air purification device is arranged in the car, so that the air in the car is filtered and purified, the quality of the air is further improved, the air purification device can only purify the air in the car, and the function is single.
To sum up, air purification in current elevator handles the air in the car basically, considers the influence of the air quality of elevartor shaft to the inside air quality of elevator very little, and simultaneously, the air purifier of filtration formula has better removal effect to tiny particles such as dust, PM2.5, but is relatively poor to the effect of killing of various viruses.
Disclosure of Invention
The invention discloses an air purification system of an elevator car, which comprises a purification device and a sterilization device, wherein the purification device is arranged inside the elevator car and used for purifying air at an air outlet of an air conditioner, the sterilization device is arranged on the outer side wall of the elevator car and irradiates a photocatalytic plate with an ultraviolet light source to perform sterilization and air purification, and the air in the elevator car is mainly exchanged from an elevator shaft, so that the air quality of the elevator shaft determines the air quality in the elevator car. And because people need to stand in the car, the car is not suitable for using some efficient sterilization equipment, so that the harm to the health of people is avoided.
The invention realizes the purpose through the following technical scheme:
an air purification system of an elevator car, comprising an elevator shaft, a car installed inside the elevator shaft and reciprocating up and down along the elevator shaft, an air conditioner installed outside the top of the car, and further comprising: the air conditioner comprises a car, a purification device, a control device and a control device, wherein the purification device is arranged on the top of the car and comprises an air inlet, an air outlet and a purification filter screen arranged between the air inlet and the air outlet; the sterilizing device is arranged on the outer side wall of the car and comprises a shell, an ultraviolet light source with the wavelength lower than 388nm is arranged on one side wall in the shell, a photocatalytic plate is arranged in the shell, and a plurality of vent holes are formed in the upper surface and the lower surface of the shell; the outside lateral wall of car is provided with the reflector layer for ultraviolet ray among the reflection sterilizing equipment makes the ultraviolet ray can not get into inside the car.
Furthermore, a plurality of ultraviolet light sources are arranged on one side wall inside the shell of the sterilizing device, and a photocatalytic plate is arranged on the rest side wall.
Furthermore, a plurality of mutually parallel photocatalytic plates are arranged in the vertical direction in the shell of the sterilizing device, and an ultraviolet light source is arranged between every two adjacent photocatalytic plates.
Further, the ultraviolet light source at least comprises a low-pressure mercury lamp with the wavelength of 250 nm-260 nm. When the microorganism is irradiated by ultraviolet rays, the genetic material, namely the nucleic acid DNA and RNA, absorbs a large amount of energy of the ultraviolet rays to be destroyed, the division and replication capacity is lost, and finally the microorganism naturally dies or is killed by an immune system, so that the pathogenic capacity of the human body is lost. The ultraviolet absorption spectrum range of the genetic material nucleic acid DNA and RNA is 250-280nm, the genetic material nucleic acid DNA and RNA are easily absorbed by proteins and nucleic acids of bacteria and viruses, the proteins can be denatured and dissociated, thymine dimers are formed in the nucleic acids, and the DNA and RNA structures of various viruses and bacteria are damaged, so that the bacteria and the viruses are killed within a few seconds, and the bacteria which cannot be sterilized by other sterilization methods can be killed. Under the irradiation of the ultraviolet light source under the wavelength, all microorganisms including bacteria, tuberculosis, viruses, spores and fungi can be killed, and the novel coronavirus killing effect is very strong. The killing rate of bacteria and viruses is more than 99 percent.
Further, the photocatalysis plate is made of nano TiO2The photocatalyst is loaded on a composite membrane obtained by high polymer materials, wherein the high polymer materials are polyvinyl alcohol, activated carbon fibers, polyvinylidene fluoride, polyamide, polyaramide, polyimide, polyether sulfone, polyphenylene sulfide, polyether ether ketone, polypropylene, polyacrylonitrile, polymethylpentene and cellulose.
Furthermore, the thickness of the photocatalytic plate is 500-1000 nm.
Furthermore, 5-15% of graphene oxide by mass is added into the photocatalytic plate.
Further, the purification filter screen is an electrostatic filter screen.
Compared with the prior art, the invention has the following beneficial effects:
1. the utility model provides an elevator car's air purification system, including purifier and sterilizing equipment, have air purification and disinfect, the effect of virus killing simultaneously, wherein purifier is used for purifying the air in the car, mainly used gets rid of tiny particles such as dust in the air, PM 2.5. The sterilizing device is mainly used for treating air in an elevator shaft, and mainly adopts an ultraviolet light source and titanium dioxide to carry out photocatalytic decomposition on viruses, bacteria and organic pollutants in the air.
2. The sterilization device adopts the ultraviolet light with the wavelength lower than 388nm as the light source, and can exert the strong catalytic degradation function under the irradiation of the ultraviolet light when the titanium dioxide is used as the photocatalyst. If under the irradiation of visible light, the catalytic action is greatly reduced, and the effect is not obvious. However, ultraviolet light has obvious damage to human bodies, and people cannot be exposed to high-intensity ultraviolet light, so that the ultraviolet light source is installed outside the car, and the outer side wall of the car is coated with a reflective material, so that the ultraviolet light cannot penetrate into the inside of the car.
3. The application discloses sterilizing equipment adopts titanium dioxide as photocatalyst, under the radiation of ultraviolet ray, makes oxygen and water around the catalyst change into very active oxygen free radical, and the oxidability is extremely strong, can decompose all organic matters harmful to human body and environment almost, can effectively degrade the poisonous and harmful gas in the air to can kill multiple bacterium, and decompose and innocent treatment the toxin that bacterium and fungi released.
4. The sterilization device is provided with a plurality of ultraviolet light sources, at least comprises a low-pressure mercury lamp with the wavelength of 250-260 nm, the ultraviolet light with the wavelength of 250 nm-260 nm can play a good sterilization role, and chromosomes can be destroyed in the wavelength interval to play a photochemical role. In the "diagnosis and treatment of novel coronavirus pneumonia" (trial seventh edition), issued by the national health and wellness Committee, it is explicitly pointed out that: the novel coronaviruses are sensitive to ultraviolet rays. The elevator is provided with the ultraviolet lamp meeting the technical specification requirement of GB19258-2012, so that the virus can be effectively killed, the bacterial repair is inhibited, and the virus propagation is reduced. The low-pressure mercury lamp can effectively kill viruses on one hand and can be used as a light source of a photocatalytic plate on the other hand.
5. The photocatalysis board loaded with titanium dioxide has the advantages that the larger the surface area is, the more the adsorption of reactants on the surface is facilitated, and the absorption of light is also facilitated, so that the photocatalysis capacity is improved.
6. The application discloses purifier adopts the static filter screen of high voltage, low-current, and the electric current is minimum, does not have the electric shock danger, also need not anxious ozone harm. Install this purifier at the air outlet of air conditioner, the air after the air conditioner is handled all needs to pass through purifier after inputing the car, avoids the air conditioner to the secondary pollution that the air caused.
Drawings
Fig. 1 is a schematic view of an air purification system of an elevator car according to the present invention;
FIG. 2 is a schematic structural diagram of a housing of the sterilization apparatus of the present invention;
FIG. 3 is a schematic structural diagram of another housing of the sterilization device of the present invention;
FIG. 4 is a schematic view of the structure of the purification apparatus of the present invention;
FIG. 5 is a schematic structural diagram of a photocatalytic plate performance test chamber.
The reference numerals are explained below:
1. a car; 2. an air conditioner; 11. a purification device; 12. a sterilizing device; 21. air supply outlet, 22, air return inlet; 101. a top surface; 102. a side wall; 103. a bottom surface; 104. a door; 111. an air inlet; 112. purifying the filter screen; 113. an air outlet; 121. a housing; 122. an ultraviolet light source; 123. a photocatalytic plate; 124. and (4) a vent hole.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a schematic view showing the construction of an air purification system for an elevator car 1 installed in an elevator shaft and reciprocating up and down along the elevator shaft, and a car body composed of a top surface 101, a side wall 102, a bottom surface 103, and a door 104 opened to the side wall. The inside of the car body is the interior of the car, and when the door is closed, a relatively closed environment is formed in the car interior, and when people take the elevator, a ventilation device is generally installed on the top of the car to exchange air flow in order to keep the air circulation. And a control button is arranged on the side wall in the car and used for realizing the functions of opening and closing a door, calling and the like of the elevator. And an air conditioner 2 is arranged on the outer side of the top surface of the car and comprises an air supply opening 21 and a return air opening 22, and the return air opening sucks air from the inside of the car and outputs the air to the inside of the car from the air supply opening after the air conditioning treatment. One end of the air supply outlet 21 and one end of the air return outlet 22 are connected to the air conditioner, and the other ends of the air supply outlet and the air return outlet extend into the room of the car.
On the top surface 101 in the car room, a purifying device 11 is installed, which comprises an air inlet 111, an air outlet 113, and a purifying filter 112 arranged between the air inlet and the air outlet, the purifying device is used for purifying the air input into the car room, the purifying device can be installed at the air supply outlet of the air conditioner, and the installation method is as follows: the air inlet is connected with the air supply outlet of the air conditioner, the air outlet is positioned in the car, and the purifying filter screen is fixed on the top surface of the car through the frame body. When the air conditioner works, air output from the air supply outlet of the air conditioner passes through the air inlet of the purifying device, is processed by the purifying filter screen and then is output into the car chamber from the air outlet.
The purification device of the embodiment may be installed in a ventilation device, and when the ventilation device is used to perform fluid flow on the air in the car and the elevator shaft, the purification device is installed at an air outlet of the ventilation device. The purpose of the purification device is that clean air is input into the car, therefore, the air input into the car is finally processed by the purification device, the air can be the air processed by an air conditioner, or the air well of the elevator is led into the car through the ventilation device, or the air in the car is processed by the purification device and then output into the car. The purifier that each kind of mode corresponds mounted position is different, can adjust according to actual conditions.
After the air in the elevator shaft is treated by the sterilizing device, most organic matters, bacteria and viruses are decomposed, but slight peculiar smell caused by ultraviolet lamp sterilization exists after decomposition, and the air can be further purified by the treatment of the purifying device, so that the air can be naturally fresh.
Further, on the outer side wall of the car, there is mounted a sterilizing device 12, which may be one or more. In the case of a sterilizing device, it is preferably mounted on the outer side wall on the side opposite the elevator door. The sterilizing device comprises a casing 121 which can be a hollow cuboid or any other shape and can be accommodated between the cage and the elevator shaft, and in order to save space, the casing is preferably a hollow cylinder with the height direction larger than the width direction, and the maximum height is the same as the height of the cage. An ultraviolet light source 122 with the wavelength less than 388nm is arranged on one side wall in the shell, and a photocatalytic plate 123 is arranged on the other side wall, and after the light source radiates to the photocatalytic plate, organic matters, bacteria, viruses and the like adsorbed on the photocatalytic plate can be killed, so that air purification and sterilization are realized. The upper surface and the lower surface of the shell are provided with a plurality of vent holes 124, air circulation inside the shell and in the elevator shaft is realized through the vent holes, when the car moves up and down, due to the fact that an accelerating process exists during starting, air in the elevator shaft can enter the shell of the sterilizing device from the vent holes on one side of the shell in an accelerating mode, when the car stops, a decelerating process exists, air inside the shell after photocatalytic treatment can be output to the elevator shaft from the vent holes on the other side of the shell, and circulation of the air is realized. The aperture of air vent is 5~20mm, for not setting up the complete formula of opening of bottom surface about, sets up bottom plate about and set up the air vent on the bottom surface, can reduce the leakage of ultraviolet ray on the one hand, makes ultraviolet ray mainly concentrate in the casing, reinforcing illumination intensity, on the other hand, can prolong the light radiation time of unit volume air, improves the decomposition effect.
Be provided with the reflector layer on the outside lateral wall of car for the reflection ultraviolet ray avoids ultraviolet ray to get into inside the car and causes harm to passenger's healthy. The lateral wall of elevartor shaft also can be lightproof material, as long as can effectively avoid the ultraviolet ray to get into inside the car can.
The following provides a further detailed description of the internal devices of the present invention.
Fig. 2 is a schematic structural diagram of a casing of the sterilization device, the casing is a hollow cuboid, a flat structure is adopted, normal use of the elevator is not affected, and the casing is made of a light-tight material, such as metal, and an ultraviolet light source is installed in the casing, so that the light source is favorably centralized, and the illumination intensity is enhanced. In the figure, a first side face is fixed on the outer side wall of the car and used for installing a light source, and a photocatalytic plate is installed on the other side face. The upper and lower bottom surfaces are provided with a plurality of vent holes 124. The light source mounted on the first side wall can be one or more, and a plurality of ultraviolet light sources can effectively enhance the illumination intensity. In order to make the photocatalytic plate function efficiently, it is necessary to increase the contact area between the air and the photocatalytic plate as large as possible, and to increase the intensity of direct irradiation of the ultraviolet light to the photocatalytic plate most effectively. Under the radiation of effective ultraviolet light, OH free radicals are generated in the shell through the catalytic action of the photocatalytic plate, so that the ultraviolet light-emitting device has strong oxidizing capability and can almost decompose all organic matters, partial inorganic matters and bacteria harmful to human bodies and the environment. Through the mode of air circulation, can realize air sterilization and purification in a short time.
Fig. 3 is another arrangement of the catalytic plates in the casing, in order to increase the surface area of the catalytic plates, a plurality of catalytic plates can be transversely arranged in the casing, in the arrangement of the catalytic plates, a plurality of catalytic plates parallel to the upper and lower bottom surfaces are transversely arranged, the distance between adjacent catalytic plates is the same, and an ultraviolet light source is arranged on the first side surface between two adjacent catalytic plates. The arrangement mode of the catalytic plate needs to be provided with a plurality of ultraviolet light sources, and the catalytic plate has good air permeability, and if the resistance of the catalytic plate is too large, the circulation of air is influenced. Alternatively, a plurality of catalyst plates may be uniformly arranged in parallel with the first side surface, which has a low air resistance, but an ultraviolet light source needs to be installed on the top surface or the bottom surface of the housing, which may affect the flow of part of the ventilation holes.
The composition of the photocatalytic sheet will be further described below.
The photocatalytic plate of the embodiment is made of nano TiO2The photocatalyst is loaded on a composite membrane obtained by high polymer materials, wherein the high polymer materials are polyvinyl alcohol, activated carbon fibers, polyvinylidene fluoride, polyamide, polyaramide, polyimide, polyether sulfone, polyphenylene sulfide, polyether ether ketone, polypropylene, polyacrylonitrile, polymethylpentene and cellulose. And 5-15% of graphene oxide by mass is added into the photocatalytic plate.
The graphene oxide is added into the photocatalytic plate, so that the photocatalytic effect is obviously improved, the graphene oxide sheet is a product of graphite powder after chemical oxidation and stripping, and the graphene oxide is a single atomic layer and can be expanded to tens of microns in transverse size at any time. Thus, its structure spans the typical dimensions of general chemistry and material science. Graphene oxide can be considered a non-traditional soft material with properties of polymers, colloids, films, and amphiphilic molecules. As an important derivative of graphene-based materials, although the oxidation process destroys the highly conjugated structure of graphene, the graphene-based materials still maintain special surface properties and a layered structure. The introduction of the oxygen-containing group not only enables the graphene oxide to have chemical stability, but also provides a surface modification active site and a larger specific surface area for synthesizing the graphene-based/graphene oxide-based material. The graphene oxide is used as a precursor and a support carrier for synthesizing the graphene-based composite material, and is easy to functionalize and high in controllability. In the process of compounding with metal, metal oxide, high molecular polymer and other materials, the material can be dispersed and attached effectively in large specific surface area to prevent agglomeration. The graphene oxide also shows excellent physical, chemical, optical and electrical properties, and is oxidized due to the coexistence of various oxygen-containing functional groups on the basal plane and the edge of the graphene sheet layer skeletonThe conductivity and band gap of the graphene can be adjusted by regulating the type and the number of the oxygen-containing functional groups. Graphene oxide is a novel carbon material with excellent properties. In the field of photocatalysis, graphene can become a carrier material with better performance than fullerene and carbon nano tube and a multifunctional material for transferring electrons or holes, after the graphene is added, the effective specific surface area and the adsorption performance of a photocatalysis plate can be obviously improved, and the graphene oxide can promote TiO2The photocatalytic performance of the composite material is improved, the recombination rate of electron-hole pairs is reduced, and the utilization efficiency of the catalytic material is improved, so that the composite material with TiO 2/graphene can enable the photocatalytic plate to have better photocatalytic activity.
Nano TiO22The surface area of the particles, which determines the amount of reactants treated per unit time and the amount of reactants treated per unit time, is important for the catalytic effect, and enables efficient sterilization and purification. Adding TiO into the mixture2The particles are loaded on a porous high polymer material, and graphene oxide is introduced, so that the effective surface area of the photocatalytic plate can be increased, and meanwhile, TiO can be enabled to be supported by a proper carrier2The higher the probability of redox caused by the enhanced light absorption capability of the particles, the higher the photocatalytic reaction activity.
The photocatalytic sheet was tested for performance as follows.
The following tests were carried out for the catalytic performance of the photocatalytic sheet. FIG. 4 is a schematic diagram of the structure of the test chamber, in the area of 0.50m3The test is carried out in the square closed box body, an ultraviolet lamp is arranged at the top of the box body, the power is 300w, the main wavelength is 260nm, the position which is 10cm under a light source is arranged, and the placing surface area is 10cm2The positive direction photocatalysis board, the thickness of photocatalysis board is 500~1000nm, and through letting in the mist of air and organic matter in the box as simulated polluted air, the organic matter can select for use matters such as formaldehyde, toluene, lets in the volume the same at every turn, through 1~10min, detects the decomposition effect of different thickness's photocatalysis board to the organic matter with gas chromatograph. The thickness of the film has a significant effect on the photocatalytic effect. The results obtained are as follows：
| Thickness/nm of photocatalytic plate | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 |
| Light irradiation 1min decomposition Rate/% | 65.3 | 72.3 | 75.4 | 81.3 | 86.4 | 89.1 | 81.3 | 78.3 |
| Light irradiation 3min decomposition Rate/% | 68.5 | 75.7 | 76.4 | 83.4 | 87.6 | 90.3 | 82.9 | 80.3 |
| Light irradiation 5min decomposition Rate/% | 74.7 | 78.1 | 80.1 | 84.2 | 87.8 | 90.8 | 83.4 | 81.2 |
| Light irradiation 7min decomposition Rate/% | 76.6 | 84.8 | 86.6 | 86.7 | 88.2 | 91.5 | 85.3 | 83.7 |
| Light irradiation 10min decomposition Rate/% | 81.3 | 86.4 | 89.4 | 87.6 | 89.9 | 91.4 | 89.4 | 87.6 |
It can be seen from the above table that the decomposition rate increases gradually with the increase of the irradiation time, the thickness of the photocatalytic plate has an obvious influence on the decomposition rate of the organic matter, and under the condition of the same irradiation time, the decomposition rate increases first and then decreases with the increase of the thickness, because when the thickness of the photocatalytic plate increases properly, the effective surface area increases, the decomposition rate increases obviously, and when the thickness reaches an energy value, the penetration rate of ultraviolet light decreases, which causes the decrease of the catalytic effect. Therefore, a too thin photocatalytic sheet has a small surface area and a low unit throughput, and a too thick photocatalytic sheet has a low light utilization rate in the same time. Therefore, the thickness of the photocatalytic plate is preferably 500 to 1000 nm.
The influence of the addition amount of graphene oxide on the catalytic effect was tested by the following test, and nano-TiO was supported2The porous polymer material of the particles is added with graphene oxide powder with different mass fractions in a spraying and hot pressing mode in a molten state, and then a decomposition performance test of organic matters is carried out. At an area of 0.50m3The test is carried out in the square closed box body, an ultraviolet lamp is arranged at the top of the box body, the power is 300w, the main wavelength is 260nm, the position which is 10cm under a light source is arranged, and the placing surface area is 10cm2The positive direction photocatalysis board, the thickness of photocatalysis board is 800nm, through letting in the mist of air and organic matter in the box as simulated contaminated air, the organic matter can select for use matters such as formaldehyde, toluene, lets in the volume the same at every turn, through 2min, detects the decomposition effect of photocatalysis board to the organic matter with gas chromatograph. The results obtained were as follows:
| mass/percent of graphene oxide | 1 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 |
| Decomposition rate/%) | 75.3 | 76.3 | 79.4 | 81.3 | 86.7 | 87.1 | 88.3 | 89.3 | 89.4 | 89.7 |
As can be seen from the above table, the decomposition rate of the organic substance starts to increase with the increase in the amount of the added graphene oxide, and after 15%, the decomposition rate does not increase significantly, and it is possible that the decomposition rate does not increase significantly after the amount of the added graphene oxide reaches a certain amount, and therefore, the amount of the added graphene oxide is preferably 5 to 15%.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (8)
1. The utility model provides an air purification system of elevator car, includes the elevartor shaft, installs in the elevartor shaft inside and along the lift car of elevartor shaft up-and-down back and forth motion, installs the air conditioner in the outside of car top, its characterized in that still includes:
the air conditioner comprises a car, a purification device, a control device and a control device, wherein the purification device is arranged on the top of the car and comprises an air inlet, an air outlet and a purification filter screen arranged between the air inlet and the air outlet;
the sterilizing device is arranged on the outer side wall of the car and comprises a shell, an ultraviolet light source with the wavelength lower than 388nm is arranged on one side wall in the shell, a photocatalytic plate is arranged in the shell, and a plurality of vent holes are formed in the upper surface and the lower surface of the shell;
the outside lateral wall of car is provided with the reflector layer for ultraviolet ray among the reflection sterilizing equipment makes the ultraviolet ray can not get into inside the car.
2. The air purification system of an elevator car as set forth in claim 1, wherein a plurality of ultraviolet light sources are provided on one side wall inside the casing of the sterilization device, and a photocatalytic plate is installed on the remaining side wall.
3. The air purification system of an elevator car according to claim 1, wherein a plurality of photocatalytic plates parallel to each other are provided in a vertical direction in the housing of the sterilizing device, and the ultraviolet light source is installed between the adjacent photocatalytic plates.
4. The air purification system of an elevator car according to claim 2, wherein the ultraviolet light source comprises at least one low-pressure mercury lamp having a wavelength of 250nm to 260 nm.
5. The air purification system of an elevator car of claim 1, wherein the photocatalytic plate is nano-TiO2The photocatalyst is loaded on a composite membrane obtained by high polymer materials, wherein the high polymer materials are polyvinyl alcohol, activated carbon fibers, polyvinylidene fluoride, polyamide, polyaramide, polyimide, polyether sulfone, polyphenylene sulfide, polyether ether ketone, polypropylene, polyacrylonitrile, polymethylpentene and cellulose.
6. The air purification system of an elevator car according to claim 4, wherein the thickness of the photocatalytic plate is 500 to 1000 nm.
7. The air purification system of an elevator car as claimed in claim 4, wherein the photocatalytic plate is further added with graphene oxide with a mass fraction of 5-15%.
8. The air purification system of an elevator car of claim 1, wherein the purification screen is an electrostatic filter screen.
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