CN101280943B - Apparatus for long-acting purifying indoor air combined pollution - Google Patents

Apparatus for long-acting purifying indoor air combined pollution Download PDF

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Publication number
CN101280943B
CN101280943B CN2008100607907A CN200810060790A CN101280943B CN 101280943 B CN101280943 B CN 101280943B CN 2008100607907 A CN2008100607907 A CN 2008100607907A CN 200810060790 A CN200810060790 A CN 200810060790A CN 101280943 B CN101280943 B CN 101280943B
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photocatalysis
electrostatic discharge
plate
source
air
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CN101280943A (en
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吴忠标
郭森
赵伟荣
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Zhejiang Zhongde Industrial Co ltd
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Zhejiang Tianlan Desulfurization And Dust-Removal Co Ltd
Zhejiang University ZJU
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Abstract

The invention discloses a long-acting apparatus for purifying indoor air combined pollution, mainly comprising a high voltage electrostatic discharge pole, a dust collection panel, a photocatalysis panel, a ultraviolet light source and regeneration-free activated carbon fiber layer. A draught fan drives airflow into the apparatus, the high voltage electrostatic discharge pole removes particles inthe airflow and generates certain content of ozone; an ultraviolet light source kills microorganism in the airflow and generates certain content of ozone, photon, hydroxyl radical free radical etc, meanwhile excites TiO2; the photocatalysis panel removes microorganism, degrades chemical pollutant; the regeneration-free activated carbon fiber layer removes ozone residual and particle unreacted pollutant in the airflow, at last clean air is discharged which implementing long-acting purification of indoor air composite pollutant. The apparatus according to the invention can be used for combined pollution air treatment in enclosed or semi-enclosed human life space.

Description

A kind of device of long-acting purifying indoor air combined pollution
Technical field
The invention belongs to room air and administer technical field.The device that relates to a kind of long-acting purifying indoor air combined pollution, finger adopts the device of static-ozone-photocatalysis-non-maintaining activated carbon process combined removal room air combined pollution especially.
Background technology
People spend at indoor (confined spaces such as room, office, the vehicles, market, hospital) the average nearly time more than 80%, and along with producing and life style modernized more, especially the development of information industry, people's more work and sports entertainment all can carry out indoor, indoor activity time even up to more than 93%, IAQ has directly influenced the healthy of people.The room air pollution main feature has: (1) room air pollution pollutant component complexity; (2) indoor air pollutants concentration is low relatively, and it is very low promptly comparing with the concentration of emission of industrial waste gas; (3) there is a large amount of pathogenic microorganisms in the room air; (4) requirement of the purification techniques of indoor air pollutants is a non-secondary pollution.
Common indoor pollutant roughly is divided three classes: the first kind is organic and inorganic pernicious gas pollutant, inorganic carbon monoxide, carbon dioxide, nitrogen oxide, sulfur dioxide, hydrogen sulfide, ozone, the radon gas etc. of comprising; Organically volatile organic matter (VOC) has formaldehyde, benzene series thing, carbon tetrachloride, trichloro-ethylene, tetrachloro-ethylene, toluene diisocyanate (TDI) etc.Second class is a pellet, mainly is dust, smog, pollen etc.The 3rd class is a microorganism, mainly is bacterium, virus etc.Indoor air pollutants mainly comes from the diffusion of mankind's activities such as fuel combustion, smoking, building and ornament materials volatilization and outdoor pollutant etc.
At miscellaneous indoor pollutant, people have developed many improvement technologies, and at wherein some process exploitations indoor air-purification device.Such as: (1) compound ventilation air-changing device: adopt the ventilation facility, realize the exchange of indoor-outdoor air.This Technological Economy is convenient, but has only realized the transfer of pollutant, and this technology is a cost to consume indoor temperature simultaneously, has increased the energy consumption of indoor heat insulating.(2) pollutant adsorbent equipment: mainly being to adsorb vapor phase contaminants to reach the removal purpose with sorbing materials such as resin, molecular sieve, silica gel, activated aluminum, zeolite, activated carbon, is the comparatively commonly used and effective control technology of present room air pollution control.Absorption method can not be destroyed the composition of pollutant by the absorption pollutant, and it transfers in the adsorbent pollutant from air, and valuable raw material is reclaimed, but this method need regenerate to adsorbent, easily causes secondary pollution.(3) negative ion generating device: anion on the one hand easily with room air in finely ground particles adsorb mutually, become charged heavy ion sedimentation, electrical the two poles of the earth, bacterioprotein top layer are put upside down, impel bacterium death.But anion fine-purification is had relatively high expectations to transmitter, and secondary fly-up easily takes place the pollutant of sedimentation, and is not high to the pollutants removal rate of low concentration in some room airs, and O is arranged 3Produce with accessory substance such as NO.(4) non-equilibrium plasma device: electronics, atom, molecule and the free radical with height reactivity and the various organic and inorganic contaminant molecule reaction that utilize gas discharge to produce, thus make contaminant molecule be decomposed into micromolecular compound.This technology can be efficiently, easily all contaminations is destroyed decomposition, but to the power requirement height, have certain electromagnetic radiation.(5) photocatalysis apparatus: TiO 2Photocatalysis oxidation technique is a kind of environmental friendliness new technology, can remove the multiple indoor air pollutants that comprise inorganic matter, organic matter, microorganism etc. simultaneously, has advantages such as energy consumption is low, easy to operate, non-secondary pollution.Yet because the room air complicated component, all kinds of indoor air-purification devices are primarily aimed at a class or a few pollutant, can not well administer combined pollution.
For solving room air combined pollution problem, people are used in combination multiple purification techniques.Such as publication number is CN1451917A, denomination of invention is the device that the Chinese patent of " a kind of purification method of room air and device " discloses a kind of indoor air purification, adopts the method for screen pack dedusting-ultraviolet-sterilization-photo-catalyst and the combination of degraded chemical pollutant to carry out room air improvement.Yet uviol lamp produces down easily ozone, causes secondary pollution, and this method and device are also not mentionedly avoided measure.Publication number is CN2221175Y, denomination of invention is the Chinese patent of " combined type indoor air cleaner ", adopt the method for charcoal absorption-molecular sieve adsorption-catalytic oxidation to carry out air improvement, adsorbable removal indoor air pollutants can be converted into CO with CO simultaneously 2Get rid of, yet there are the saturated problem of absorption in charcoal absorption and molecular sieve adsorption, need after the use for a long time to change or adopt certain method to regenerate, can not reach the requirement of the indoor combined pollutant of long-acting removal.This shows,, be necessary to develop a kind of device of long-acting removal room air combined pollution, and be applied to people's life at present room air pollution and improvement present situation thereof.
Summary of the invention
It is few to the present invention is directed to present indoor air cleaner processing pollutant kind, the use complexity, can not efficiently act on for a long time, easily produce shortcomings such as secondary pollution, a kind of long-acting purifier that room air combined pollutants such as particle, microorganism, chemical pollutant is all had better removal effect is provided.
A kind of device of long-acting purifying indoor air combined pollution, comprise shell, be provided with blower fan, high-pressure electrostatic discharge electrode, high voltage source, collecting plate, dust-collector, dc source, ultraviolet source, photocatalysis plate in the described shell, exempt from the regenerated carbon fibrage, the shell front lower ends is provided with air inlet, the lower end, rear portion is provided with the gas outlet, near the gas outlet blower fan is set in the housing; Be provided with the high-pressure electrostatic discharge electrode, the parallel collecting plate that is provided with near air inlet in the housing with the high-pressure electrostatic discharge electrode; Some groups of photocatalysis plates are set behind the collecting plate, and adjacent photocatalysis plate one end is alternately fixed with the upper and lower plates of shell, and the other end leaves the space; Be provided with ultraviolet source between the photocatalysis plate; Be provided with before the blower fan of housing rear portion and exempt from the regenerated carbon fibrage; Bottom of device is established dust-collector, dc source, high voltage source successively, and described dust-collector places in the middle of the collecting plate below, and dc power anode links to each other with the photocatalysis plate, and the high voltage source negative pole links to each other with the high-pressure electrostatic discharge electrode.
Described collecting plate is two, sets up high-pressure electrostatic discharge electrode both sides separately.
Described high-pressure electrostatic discharge electrode adopts negative corona discharge, and the corona current potential is in the arbitrary current potential between negative 25 to negative 10KV.
Described ultraviolet source adopts low pressure mercury lamp, and dominant wavelength is 200~300nm.
Described photocatalysis plate is that load has TiO 2Sheet metal such as titanium, stainless steel, its base material links to each other with dc source, makes the plate current potential maintain arbitrary current potential between 1~2.5V.
The described regenerated carbon fibrage of exempting from has TiO for the equal load in surface and inside 2NACF, TiO wherein 2Mass content between 5~30%.
Room air mainly divided for four steps by the purification process that blower fan drives behind the air inlet access to plant:
1, electrostatic precipitation
The present invention adopts the technology of electrostatic precipitation to remove particle in the air-flow.Specifically select the negative corona discharge dedusting for use, the corona current potential is in the arbitrary current potential between negative 10 to negative 25KV.
This technology can produce certain ozone, enters ultraviolet-sterilization and photocatalysis section.
Select the reason of negative corona discharge dedusting to be: under the general same operation condition, negative corona discharge electrostatic precipitation technology ozone generating amount is 10 times of positive corona discharge dust collecting process.For reaching the requirement of efficient sterilizing among the present invention, degradation of organic substances, need the collaborative of a certain amount of ozone.In addition, from energy-conservation aspect, the energy consumption of negative corona discharge is also discharged far below positive corona.
2, ultraviolet-sterilization
The present invention adopts the method for ultraviolet irradiation to remove microorganism in the air-flow.Light source adopts low pressure mercury lamp, and dominant wavelength is 200~300nm.Under the ultraviolet source irradiation, can produce a certain amount of ozone, photoelectron, hydroxyl radical free radical etc. in the air-flow.
3, TiO 2Chemical pollutant and part microorganism are removed in photocatalysis
The present invention adopts TiO 2Light-catalysed method is removed chemical pollutant and the part microorganism in the air-flow.Photocatalysis adopts the baffling passage to increase the gas-solid contact area.TiO 2The method that adopts anodic oxidation to prepare on the titanium plate or wipe with chemical vapour deposition (CVD) prepares on sheet metals such as titanium, stainless steel.The photocatalysis plate substrate links to each other with a direct current power supply, and current potential maintains the arbitrary current potential between 1~2.5V, to promote the separation of photohole electronics, improves the purification efficiency of photocatalysis plate.
4, exempt from regenerated carbon and remove residual ozone and the unreacted pollutant of part in the air-flow
The present invention adopts load TiO 2The NACF screen pack remove residual ozone and the unreacted pollutant of part in the air-flow, further reduce pollutant levels, guarantee purification efficiency.Produce a certain amount of ozone behind air-flow process electrostatic precipitation, the ultraviolet source irradiation,,, still have part residual ozone and unreacted chemical pollutant to take out of, can adopt load TiO because air velocity is fast though major part is decomposed in photocatalytic process 2The NACF screen pack with its absorption back degraded.In addition, because NACF screen pack area load has TiO 2But, its absorption pollutant photocatalytic degradation, thus make it keep certain adsorption capacity, without thermal process regeneration, can use for a long time.
Apparatus of the present invention can be used for the combined pollution air of (in room, office, meeting room, laboratory, toilet, ward, passenger car) in sealing or the semi-enclosed human living space and administer.
The advantage of apparatus of the present invention is: can remove combined pollutants such as particle in the room air, biological pollutant, chemical pollutant, have wide range of applications; Employing is exempted from regenerated carbon and removed residual ozone and the unreacted pollutant of part in the air-flow, has avoided secondary pollution, and exempts from regenerated carbon and do not need frequent the replacing to safeguard, has reduced processing cost, and is simple to operate, long service life; Gas circuit adopts catalytic plate baffling mode, reduces windage, increases flow channel length, catalytic efficiency height.
Description of drawings
Fig. 1 is apparatus of the present invention most preferred embodiment assembled state cross-sectional view
Wherein: 1 collecting plate, 2 shells, 3 high-pressure electrostatic discharge electrodes, 4 air inlets, 5 dust-collectors, 6 photocatalysis plates, 7 exempt from the regenerated carbon fibrage, 8 gas outlets, 9 blower fans, 10 high voltage sourcies, 11 dc sources, 12 ultraviolet sources.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment a kind of preferred forms of the present invention is further specified.
As shown in Figure 1, a kind of device of long-acting purifying indoor air combined pollution comprises shell 2, is provided with blower fan 9, high-pressure electrostatic discharge electrode 3, high voltage source 10, collecting plate 1, dust-collector 5, dc source 11, ultraviolet source 12, photocatalysis plate 6 in the shell 2, exempts from regenerated carbon fibrage 7.Shell 2 front lower ends are provided with air inlet 4, and the lower end, rear portion is provided with gas outlet 8, near gas outlet 4 blower fan 9 are set in the housing; Be provided with high-pressure electrostatic discharge electrode 3 near air inlet 4 in the housing, high-pressure electrostatic discharge electrode 3 both sides are provided with two collecting plates 1; Some groups of photocatalysis plates 6 are set behind the collecting plate 1, and adjacent photocatalysis plate 6 one ends are alternately fixed with the upper and lower plates of shell 2, and the other end leaves the space; 6 of photocatalysis plates are provided with ultraviolet source 12; Bottom of device is established dust-collector 5, dc source 11, high voltage source 10 successively, and wherein dust-collector 5 places in the middle of two collecting plate 1 belows, and dc source 11 positive poles link to each other with photocatalysis plate 6, and high voltage source 10 negative poles link to each other with high-pressure electrostatic discharge electrode 3.
Blower fan 9 drives air-flows, and air-flow enters purifier via air inlet 4, at the effect of high-pressure electrostatic discharge electrode 3, the high voltage source 10 particle-removing thing that goes down, and produces a certain amount of ozone, and the corona current potential is in the arbitrary current potential between negative 25 to negative 10KV.Particle is collected by collecting plate 1, falls within the dust-collector 5, and be pasting material in the dust-collector 5, this material can regularly take out cleaning.Photocatalysis plate 6 can be made on metal base by the method for anodic oxidation or chemical vapour deposition (CVD), and metal base is provided the positive potential of 0~2.5V by dc source 11.Photocatalysis plate 6 constitutes folding shape runners, and (adopt low pressure mercury lamp, dominant wavelength is that microorganism is removed in 200~300nm) irradiation down to air-flow at ultraviolet source 12 via runner.UV-irradiation photocatalysis plate 6, air-flow are removed pollutants such as VOCs through photocatalysis, and consume a certain amount of ozone.By air stream outlet 8 discharges, exempt from regenerated carbon fibrage 7 has TiO for surperficial and inner all loads to air-flow after exempting from 7 absorption of regenerated carbon fibrage to remove residual ozone and pollutant 2NACF, TiO wherein 2Mass content between 5~30%.
Embodiment 1: apparatus structure as shown in Figure 1.Total consumption of a system is 60W, and the processing air quantity is 1m 3/ min, the corona current potential is negative 25KV, the metal base of photocatalysis plate flows the positive potential that power supply provides 0.3V by straightening, exempts from TiO in the regenerated carbon fibrage 2Mass content be 15%.At 30m 3Degraded toluene and formaldehyde in the closed environment cabin, temperature is 28 ℃ in the cabin, and relative humidity is 55%, and toluene concentration is 12mg/m 3, concentration of formaldehyde is 30mg/m 3, behind the start 12h, toluene concentration is 0.56mg/m 3, concentration of formaldehyde is 0.25mg/m 3, ozone does not detect.The toluene clearance is 95.3%, and the formaldehyde clearance is 99.1%.
Embodiment 2: apparatus structure as shown in Figure 1.Total consumption of a system is 60W, and the processing air quantity is 1m 3/ min, the corona current potential is negative 10KV, the metal base of photocatalysis plate provides the positive potential of 0.6V by dc source, exempts from TiO in the regenerated carbon fibrage 2Mass content be 5%.At 60m 3Operation in certain room, indoor temperature is 25 ℃, relative humidity is 50%, PM 10Concentration is 0.9mg/m 3, toluene concentration is 1.3mg/m 3, concentration of formaldehyde is 5.0mg/m 3, total plate count is 3600cfu/m 3, behind the start 12h, PM 10Concentration is 0.02mg/m 3, toluene concentration is 0.11mg/m 3, concentration of formaldehyde is 0.08mg/m 3, total plate count is 900cfu/m 3, ozone does not detect.PM 10Clearance is 97.7%, and the toluene clearance is 91.5%, and the formaldehyde clearance is 98.4%, and the bacterium colony clearance is 75.0%.
Embodiment 3: apparatus structure as shown in Figure 1.Total consumption of a system is 80W, and the processing air quantity is 1m 3/ min, the corona current potential is negative 10KV, the metal base of photocatalysis plate provides the positive potential of 0.8V by dc source, exempts from TiO in the regenerated carbon fibrage 2Mass content be 5%.At 45m 3Operation in certain hospital toilet, indoor temperature is 30 ℃, relative humidity is 68%, PM 10Concentration is 0.03mg/m 3, total plate count is 7200cfu/m 3, behind the start 12h, PM 10Concentration is 0.01g/m 3, total plate count is 1600cfu/m 3, ozone does not detect.PM 10Clearance is 66.7%, and the bacterium colony clearance is 77.8%.
Embodiment 4: apparatus structure as shown in Figure 1.Total consumption of a system is 30W, and the processing air quantity is 0.50m 3/ min, the corona current potential is negative 15KV, the metal base of photocatalysis plate provides the positive potential of 2.5V by dc source, exempts from TiO in the regenerated carbon fibrage 2Mass content be 25%.Move in 32 air-conditioning touring cars, vehicle interior temperature is 25 ℃, and relative humidity is 50%, PM 10Concentration is 0.06mg/m 3, toluene concentration is 1.2mg/m 3, concentration of formaldehyde is 2.3mg/m 3, total plate count is 2200cfu/m 3, behind the start 12h, PM 10Concentration is 0.02mg/m 3, toluene concentration is 0.13mg/m 3, concentration of formaldehyde is 0.09mg/m 3, total plate count is 850cfu/m 3, ozone does not detect.PM 10Clearance is 66.7%, and the toluene clearance is 89.2%, and the formaldehyde clearance is 99.6%, and the bacterium colony clearance is 61.4%.

Claims (3)

1. the device of a long-acting purifying indoor air combined pollution, comprise shell (2), it is characterized in that: be provided with blower fan (9), high-pressure electrostatic discharge electrode (3), high voltage source (10), collecting plate (1), dust-collector (5), dc source (11), ultraviolet source (12), photocatalysis plate (6) in the described shell (2), exempt from regenerated carbon fibrage (7); Shell (2) front lower ends is provided with air inlet (4), and the lower end, rear portion is provided with gas outlet (8), near gas outlet (8) blower fan (9) is set in the housing; Be provided with high-pressure electrostatic discharge electrode (3), the parallel collecting plate (1) that is provided with near air inlet (4) in the housing with high-pressure electrostatic discharge electrode (3); Some groups of photocatalysis plates (6) are set behind the collecting plate (1), and described photocatalysis plate (6) has TiO for load 2Sheet metal, adjacent photocatalysis plate (6) one ends are alternately fixed with the upper and lower plates of shell (2), the other end leaves the space; Be provided with ultraviolet source (12) between photocatalysis plate (6); Preceding being provided with of the described blower fan (9) at housing rear portion exempted from regenerated carbon fibrage (7), and the described regenerated carbon fibrage (7) of exempting from has TiO for the equal load in surface and inside 2NACF, TiO 2Mass content be 5~30%; Bottom of device is established dust-collector (5), dc source (11), high voltage source (10) successively, wherein dust-collector (5) places in the middle of collecting plate (1) below, dc source (11) is anodal to link to each other with photocatalysis plate (6), and high voltage source (10) negative pole links to each other with high-pressure electrostatic discharge electrode (3).
2. device as claimed in claim 1 is characterized in that: described collecting plate is two, sets up high-pressure electrostatic discharge electrode (3) both sides separately.
3. device as claimed in claim 1 is characterized in that: described ultraviolet source (12) adopts low pressure mercury lamp, dominant wavelength 200~300nm.
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