Classifications

• • 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
• • 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
• • 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
  • B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
  • B01D51/10—Conditioning the gas to be cleaned
• • 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
  • B01D53/88—Handling or mounting catalysts
  • B01D53/885—Devices in general for catalytic purification of waste gases
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
  • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
  • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
  • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
  • F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
• • 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
  • B01D2257/00—Components to be removed
  • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
  • B01D2257/708—Volatile organic compounds V.O.C.'s
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2257/00—Components to be removed
  • B01D2257/91—Bacteria; Microorganisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2259/00—Type of treatment
  • B01D2259/45—Gas separation or purification devices adapted for specific applications
  • B01D2259/4508—Gas separation or purification devices adapted for specific applications for cleaning air in buildings
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
  • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
  • F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
  • F24F8/167—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
  • F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
  • F24F8/22—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using UV light

Definitions

• the invention relates to a method and a device for performing PCO reaction, in particular, to a method and a device for adjusting the humidity of a photocatalyst during PCO reaction.
• the invention further relates to an air purifier, which employs the device for performing PCO reaction.
• indoor air pollution has received immense attention since the early 1990s partially owing to the studies showing the level of pollutants in indoor environment is actually higher than in outdoor environment. In addition, people generally spend more than 80% of their time indoors, which contributes a higher risk from inhalation of pollutants than outdoors. In 1995, USEPA (US Environmental Protection Agency) identified that indoor air pollution was one of the top environmental risks.
• the indoor air pollutants may be categorized into three groups:
• VOC volatile organic compounds
• Biological pollutants that include bacteria, fungi, virus...
• PCO commonly uses semiconductor photocatalysts and ultraviolet (UV) light to decompose organic compounds into benign and odorless constituents such as water vapor (H 2 0) and carbon dioxide (C0 2 ).
• UV light ultraviolet
• C0 2 carbon dioxide
• VB valence band
• CB vacant conduction band
• h + positive hole
• the positive holes (h + ) and electrons (e " ) are powerful oxidizing and reducing agents, respectively. They efficiently produce OH- (hydroxyl radical) and 0 2 " through the following reactions:
• OH- is a very powerful oxidizing substance. It is derived from the oxidation of adsorbed water or adsorbed OH " . When OH- encounters VOCs in the air, the following degradation reaction takes place:
• PCO The main limiting factors of PCO include the incomplete oxidation and slow reaction rate, both will result in various byproducts, some of which could be toxic. Studies have shown that there is an optimum humidity range for achieving the best PCO result. When the humidity is too low, there could be insufficient water molecules for generating hydroxyl radicals; when the humidity is too high, water vapor competes with Ti0 2 for adsorption sites, which decrease the rate of PCO. To improve reaction rate and minimize incomplete oxidation intermediates, humidity level at the surface of photo catalysts needs to be maintained in an optimum window. For instance, an optimum humidity range for removing toluene and formaldehyde by PCO could be about 1000 ppmv to 4000 ppmv, with Ti02 being the PCO catalyst.
• WO97/09073A1 discloses a method and device for disinfecting an air stream containing microorganisms. Specifically, the air steam is provided with certain relative humidity e.g., greater than about 40% in view that PCO reaction requires that the relative humidity cannot be too low. However, WO97/09073 only mentioned generally the humidity of the air stream is controlled, without details regarding the implementation.
• EP1980317A1 disclses a device for regaining deodoration function, esp., based on cold plasma. However, EP1980317A1 is not relating to photocatalytic oxidation of VOCs, and provides no disclosure of how the humidity of air flow is controlled.
• WO2010/093796A1 discloses an air treatment device based on UV. Though WO2010/093796 A 1 mentiones PCO reation is dependent on relative humidity of the air, it only disclose a solution for designing the device according to certain relative humidity, or, adjust the parameters of the reaction system according to the given humidity, instead of changing the relative humidity fo the air per se.
• an embodiment of the invention provides a method for performing PCO reaction, the method comprises steps of: guiding an air flow into a PCO reactor, which PCO reactor contains photocatalyst for the PCO reaction; splitting the air flow into a first stream and a second stream, wherein quantity of the first stream being less than quantity of the second stream; obtaining the humidity of the photocatalyst; controlling the humidity of the first stream according to the obtained humidity of the photocatalyst; adjusting the humidity of the photocatalyst by guiding the first stream to surface of the photocatalyst; guiding the second stream through the photocatalyst; and illuminating the photocatalyst with light.
• controlling the humidity of the first stream refers to the functions of: humidifying the first stream, keeping the humidity of the first stream unchanged, or dehumidifying the first stream. Therefore, “adjusting the humidity of the photocatalyst” also refers to the functions of: humidifying the photocatalyst, keeping the humidity of the photocatalyst unchanged, or dehumidifying the photocatalyst.
• the step of controlling comprises modulating the humidity of the first stream to a target humidity according to a difference between the obtained humidity of the photocatalyst and a predetermined humidity of the photocatalyst.
• the humidity of the first stream can be controlled in a mode of direct feedback. That is, the adjustment amount of humidity for the first stream can be rectified automatically.
• the method further comprises detecting the humidity of the air flow; and the step of controlling comprises modulating the humidity of the first stream to a target humidity according to the obtained humidity of the photocatalyst, the detected humidity of the air flow and a predetermined humidity of the photocatalyst.
• the adjustment amount of humidity for the first stream can be calculated based on the quantity of the first stream, so that the photocatalyst may receive a proper amount of humidity to achieve the optimum humidity.
• the first stream is humidified if the obtained humidity of the photocatalyst is smaller than the predetermined humidity of the photocatalyst; the humidity of the first stream is kept unchanged if the obtained humidity of the photocatalyst is equal to the predetermined humidity of the photocatalyst; and the first stream is dehumidified if the obtained humidity of the photocatalyst is larger than the predetermined humidity of the photocatalyst.
• the humidity of the first stream is controlled by guiding the first stream through a humidity controlling channel;
• the humidity controlling channel comprises three channels in parallel, each of these three channels being respectively adapted for:
• the PCO reactor comprises: an inner tube, which comprises a first opening and a second opening; the inner tube is perforated; the photocatalyst is arranged on the inner surface of the inner tube; an outer tube, which comprises a third opening and a fourth opening; the outer tube jackets the inner tube to form a jacket chamber comprising a jacket chamber opening between the first opening and the third opening; a sealing surface, which extends between the second opening and the fourth opening; and a light source, which is arranged within the inner tube for illuminating the photocatalyst.
• the first stream is guided into the jacket chamber from the jacket chamber opening after the step of controlling; the second stream is guided into the inner tube from the first opening.
• the invention also proposes a device for performing PCO reaction, the device comprises: a PCO reactor, which contains photocatalyst for PCO reaction; an air flow channel for guiding an air flow for PCO reaction; an air splitting unit for splitting the air flow into a first stream and a second stream, wherein quantity of the first stream being less than quantity of the second stream; a hygrometer for obtaining the humidity of the photocatalyst; a humidity controlling channel for controlling the humidity of the first stream and adjusting the humidity of the photocatalyst by guiding the first stream to surface of the photocatalyst; and a main stream channel for guiding the second stream through the photocatalyst.
• a PCO reactor which contains photocatalyst for PCO reaction
• an air splitting unit for splitting the air flow into a first stream and a second stream, wherein quantity of the first stream being less than quantity of the second stream
• a hygrometer for obtaining the humidity of the photocatalyst
• the humidity of the first stream is controlled to a target humidity according to a difference between the obtained humidity of the photocatalyst and a predetermined humidity of the photocatalyst.
• the humidity of the first stream can be controlled in a mode of direct feedback. That is, the adjustment amount of humidity for the first stream can be rectified automatically.
• the device further comprises a humidity sensor for detecting the humidity of the air flow; and the humidity of the first stream is controlled to a target humidity according to the obtained humidity of the photocatalyst, the detected humidity of the air flow and a predetermined humidity of the photocatalyst.
• the adjustment amount of humidity for the first stream can be calculated based on the quantity of the first stream, so that the photocatalyst may receive a proper amount of humidity to achieve an optimum humidity.
• the first stream is humidified if the obtained humidity of the photocatalyst is smaller than the predetermined humidity of the photocatalyst; the humidity of the first stream is kept unchanged if the obtained humidity of the photocatalyst is equal to the predetermined humidity of the photocatalyst; and the first stream is dehumidified if the obtained humidity of the photocatalyst is larger than the predetermined humidity of the photocatalyst.
• the humidity controlling channel comprises three channels in parallel, each of these three channels being respectively adapted for: humidifying the first stream, keeping the humidity of the first stream unchanged, or dehumidifying the first stream.
• the PCO reactor comprises: an inner tube, which comprises a first opening and a second opening; the inner tube is perforated; the photocatalyst is arranged on the inner surface of the inner tube; an outer tube, which comprises a third opening and a fourth opening; the outer tube jackets the inner tube to form a jacket chamber comprising a jacket chamber opening between the first opening and the third opening; a sealing surface, which extends between the second opening and the fourth opening; and a light source, which is arranged within the inner tube.
• the first stream is guided into the jacket chamber from the jacket chamber opening after the step of controlling; the second stream is guided into the inner tube from the first opening.
• An air purifier comprising the device for performing PCO reaction according to any of the embodiments of the invention is also proposed.
• Fig. 1 illustrates the principle of photocatalytic oxidation
• Fig. 2 illustrates a schematic diagram of a device for performing PCO reaction according to an embodiment of the invention
• Fig. 3 illustrates a schematic diagram of operation principle according to an embodiment of the invention.
• Adjusting the humidity of the photocatalyst can be achieved by means of a relatively small part of the air flow, which is treated based on the obtained humidity of the photocatalyst.
• the small air stream is guided to the catalyst surface to have direct impact on the humidity level on the catalyst surface.
• a method for performing PCO reaction comprises: guiding an air flow into a PCO reactor, which PCO reactor contains photocatalyst for the PCO reaction; splitting the air flow into a first stream and a second stream, wherein quantity of the first stream being less than quantity of the second stream; obtaining the humidity of the photocatalyst; controlling the humidity of the first stream according to the obtained humidity of the photocatalyst; adjusting the humidity of the photocatalyst by guiding the first stream to surface of the photocatalyst; guiding the second stream through the photocatalyst; and illuminating the photocatalyst with light.
• the method can be carried out by a device for performing PCO reaction, which is shown in Fig. 2.
• the device 100 comprises: a PCO reactor 101, which contains photocatalyst 102 for PCO reaction; an air flow channel 103 for guiding an air flow 104 for PCO reaction; an air splitting unit 105 for splitting the air flow 104 into a first stream 106 and a second stream 107, wherein quantity of the first stream 106 being less than quantity of the second stream 107; an obtaining unit (e.g., hygrometer) 108 for obtaining the humidity of the photocatalyst 102; a humidity controlling channel 109 for controlling the humidity of the first stream 106 and adjusting the humidity of the
• photocatalyst 102 by guiding the first stream 106 to the photocatalyst 102; and a main stream channel 109' for guiding the second stream 107 through the photocatalyst 102.
• the obtaining unit 108 can be implemented in any of following way:
• a hygrometer that is adjacent to the surface of the photocatalyst 102 and configured to detect the humidity on the surface of the photocatalyst 102 directly;
• a hygrometer configured to detect the humidity of air flow 104 or the ambient air, the detected humidity is considered as the humidity of the photocatalyst
• a module that is able to communicate with an external source from where it obtains an estimation/forecast of the humidity of the photocatalyst (102).
• the humidity adjustment of the photocatalyst 102 is implemented by changing the local humidity on the photocatalyst surface.
• a control unit e.g., implemented by a processor or a control module
• Fig. 3 illustrates a schematic diagram of operation principle according to an embodiment of the invention.
• a humidity sensor detects (at 201) the humidity (H ca taiyst) of the photocatalyst and sends (at 202) the result to a control unit.
• An ideal humidity value Hid ea i is
• the humidity sensor does not have to be very accurate (e.g., 5% error margin is acceptable).
• the humidity of the photocatalyst can also be derived from some relevant parameters.
• the humidity of the photocatalyst can also be derived from humidity in the PCO reactor.
• the humidity of the first stream can be controlled by allowing the first stream pass through a desiccator / humidifier if the humidity of the first stream should be changed.
• the humidification mode is activated (at 204). Based on the humidity difference, the control unit calculates the amount of the humidity adjustment according to the quantity/rate of the first stream passing through PCO reactor channel. The valve to the desiccator shuts off. The valve to the humidifier opens accordingly to allow the air pass through.
• a number of humidification methods are possible for the invention, e.g.
• the dehumidification mode is activated (at 205). Based on the humidity difference, the control unit calculates the amount of the humidity adjustment according to the quantity/rate of the first stream passing through PCO reactor channel. The valve to the humidifier is shut off. The valve to the desiccator opens accordingly to allow the air pass through. A number of dehumidification methods are possible for the invention but passing through a desiccator is preferred.
• the amount of the humidity adjustment to the first stream can be adjusted if the quantity/rate of the first stream is constant; the quantity/rate of the first stream (i.e., the quantity proportion between the first and the second stream) can also be adjusted if the humidity adjustment to the first stream is constant; moreover, the humidity adjustment to the first stream and the quantity/rate of the first stream can both be adjustable.
• the amount of the humidity adjustment refers to humidity variation caused by the humidity adjustment (i.e., the degree of the change in humidity, which is made to the first stream).
• the quantity of the first stream with respect to the air flow can thus be determined according to the amount of the humidity adjustment. Therefore, the quantity of the first stream can be adjusted to be relatively small if the amount of the humidity adjustment is large.
• the humidity of the first stream is controlled to a target humidity according to a difference between the obtained humidity of the photocatalyst and a predetermined humidity of the photocatalyst.
• the humidity of the first stream can be controlled in a mode of direct feedback. That is, the adjustment amount of humidity for the first stream can be rectified automatically.
• the device further comprises a humidity sensor (not shown in Fig.
• the humidity of the first stream is controlled to a target humidity according to the obtained humidity of the photocatalyst, the detected humidity of the air flow and a predetermined humidity of the photocatalyst.
• the adjustment amount of humidity for the first stream can be calculated based on the quantity of the first stream, so that the photocatalyst may receive a proper amount of humidity to achieve the optimum humidity.
• the first stream is humidified if the obtained humidity of the photocatalyst is smaller than the predetermined humidity of the photocatalyst; the humidity of the first stream is kept unchanged if the obtained humidity of the photocatalyst is equal to the predetermined humidity of the photocatalyst; and the first stream is dehumidified if the obtained humidity of the photocatalyst is larger than the predetermined humidity of the photocatalyst.
• the humidity of the photocatalyst can be adjusted to a ideal value (or in an optimum range) without modifying the splitting structure for the air flow.
• the entire air flow can also passes through the photocatalyst without splitting.
• the humidity of the first stream is controlled by guiding the first stream through the humidity controlling channel 109;
• the humidity controlling channel 109 comprises three channels in parallel, each of these three channels being respectively adapted for: humidifying the first stream, keeping the humidity of the first stream unchanged, or dehumidifying the first stream.
• the PCO reactor comprises: an inner tube 110, which comprises a first opening 111 and a second opening 112; the inner tube 110 is perforated; the photocatalyst 102 is arranged on the inner surface of the inner tube 110; an outer tube 113, which comprises a third opening 114 and a fourth opening 115; the outer tube 113 jackets the inner tube 110 to form a jacket chamber 116 comprising a jacket chamber opening 117 between the first opening 111 and the third opening 114; a sealing surface 118, which extends between the second opening 112 and the fourth opening 115; and a light source 119, which is arranged within the inner tube 110 for illuminating the photocatalyst 102.
• the first stream 106 is guided into the jacket chamber 116 from the jacket chamber opening 117 after the humidity of the first stream 106 is controlled; the second stream 107 is guided into the inner tube 110 from the first opening 111.
• the embodiment of the invention utilizes the incoming air flow to adjust the humidity in the vicinity of photocatalyst surface.
• Many photocatalysts can be the choice, e.g., Ti0 2 , surface modified Ti0 2 , W0 3 , or hybrid of metal oxides.
• the inner tube 110 is perforated for flowing of the first stream.
• the humidity on the surface of the photocatalyst is changed without significant change to the overall humidity of the discharged air.
• the shape and structure of the PCO reactor 101 can also be varied.
• Output humidity of a humidifier/dehumidifier is controllable.
• the quantity of the first stream 106 shall be small, e.g., 10% of the air flow 104. Assuming the target humidity for the PCO reaction is 4000 ppmv, and the humidity of the intake air is 2000 ppmv, the first stream 106 therefore needs to be humidified. As long as the output humidity of the humidifier is modulated to 4000 ppmv, the first stream 106 can be directed to the humidifier for humidification.
• Output humidity from a humidifier/dehumidifier is relatively fixed.
• the output humidity from a humidifier/dehumidifier is relatively fixed means, no matter how dry/wet the income air is, after pasting through the humidifier/dehumidifier, the outcome humidity of the air can be always around a certain value or within a certain range.
• the optimum humidity Hid ea i is 4000 ppmv (predeteremined). If the detected humidity (humidity of the ambient air) H a i r is 16000 ppmv, since H a i r > Hid eal , the first steam 106 needs to be desiccated.
• the following algorithms can be used to determine how much air (i.e., the quantity of the first stream 104) needs to be desiccated. Assuming the humidity of the first stream 104 after passing though the desiccator is 1000 ppmv, then
• 16 m 3 /h of of the total air flow needs to be desiccated. After being dried, 16 m 3 /h of of the total air flow can be mixed with the rest untreated air (4 m 3 /h). The small stream of air (4000 ppmv, 20 m 3 /h) is guided to the catalyst surface.
• the ratio between the first stream and the second stream can also be adjusted according to the result of the calculating. That means, after calculating as described above, a stream with a flux of 16 m 3 /h can be separated directly from the total air as the first stream 106.
• An air purifier comprising the device for performing PCO reaction according to any of the embodiments of the invention is also proposed.
• the PCO reactors can also be connected with each other.
• humidification/dehumidification of the catalyst 102 may not need to be repeated quite often.
• the humidity control of the photocatalyst described in the context can be repeated once per hour or every two hours, or depending on the actual needs (e.g., the water on the catalyst volatilize too fast).

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• 2014
  • 2014-12-12 CN CN201480071774.1A patent/CN105873620B/zh not_active Expired - Fee Related
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