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WO2008019686A1 - Wet type air cleaner - Google Patents

Wet type air cleaner Download PDF

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Publication number
WO2008019686A1
WO2008019686A1 PCT/DK2007/000371 DK2007000371W WO2008019686A1 WO 2008019686 A1 WO2008019686 A1 WO 2008019686A1 DK 2007000371 W DK2007000371 W DK 2007000371W WO 2008019686 A1 WO2008019686 A1 WO 2008019686A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
channel
zone
drops
liquid
Prior art date
Application number
PCT/DK2007/000371
Other languages
French (fr)
Inventor
Preben Staehr
Original Assignee
Turbovent Environment A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Turbovent Environment A/S filed Critical Turbovent Environment A/S
Publication of WO2008019686A1 publication Critical patent/WO2008019686A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • 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
    • F24F8/117—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 using wet filtering
    • F24F8/133—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 using wet filtering by direct contact with liquid, e.g. with sprayed liquid
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K1/00—Housing animals; Equipment therefor
    • A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K1/00—Housing animals; Equipment therefor
    • A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
    • A01K1/0082—Water misting or cooling systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • 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
    • B01D53/14—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 absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • 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
    • 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
    • F24F8/117—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 using wet filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the invention relates to a method of cleaning room air, such as indoor air and stable air, said room air being sucked out from the room by means of a fan which is mounted in an air channel. Moreover, the invention relates to an apparatus for performing the method.
  • Polluted air constitutes an increasing problem, partly because the pollution is unpleasant to smell, partly for hygienic reasons.
  • Kadymov An example of a system is disclosed in EP 1082989 (Kadymov).
  • the system of Kadymov comprises a chamber in which the polluted air is conveyed horizontally through the three zones. In the separation zone, rotor blades are used for striking the water drops. Each zone contains collection trays and drains for conveying the collected liquid to a central collection container.
  • a horizontal structure with several collection trays and drains is difficult to construct and is not suitable for e.g. small rooms, where the available space only allows compact air cleaning systems.
  • the air is sucked into the top of the chamber. This, however, is not very expedient since the heavy polluted air is present lowermost in a room and must therefore be sucked into the bottom of the chamber. At the same time, the cleaned air must be pumped out at the top of the chamber. Therefore, it is not expedient to construct the system in this manner.
  • the object of the invention is to remedy these defects, and this is achieved according to the invention when the room air, after having been sucked into the air channel, is wetted by passing through a water mist zone, following which the wetted air passes through an absorption zone in which impurities are absorbed in the water drops, following which air and water drops are separated in an separation zone, preferably in the form of a centrifugation, in which the drops are thrown against the channel wall, following which the water drops/the water run down to be collected at the channel bottom, while the cleaned air is discharged from the channel.
  • the air will be cleaned of impurities as well as gases in a surprisingly simple manner and finally be discharged as cleaned and conditioned air having a suitably low air moisture.
  • the pollution is suspended in the drops in the wetting chamber in the wetting zone and is then passed through a separation chamber, in which the drops are collected and then slide down along the interior of the channel wall in liquid form.
  • the polluted water may hereby be collected and subsequently be cleaned with a view to recycling, etc.
  • the operational costs are limited to the sprinkler liquid and the power for driving fan, which results in minimum operational costs. To this should be added the low noise generation involved by the method, and that the system has a relatively compact structure.
  • the air cleaner 1 is mounted in an upright channel 2, in which there is an inlet at the bottom for the air 4 which is to be cleaned.
  • a base 5 is configured at the bottom as a collection tray for the liquid 17 which is an end product of the cleaning.
  • Nozzles 3 are mounted at the lower part of the channel, which emit a water mist for wetting the air 4 when this passes through the wetting zone 6.
  • channel 8 which constitutes an absorption zone, in which the content of polluted substances and vapours of the air 7 are absorbed by the liquid in drop shape.
  • a guide plate 9 is arranged for the moisture-containing air, which is then conveyed into a blower wheel 11 , which partly sucks the air 7, partly imparts to it a centrifugal movement outwards toward the channel wall 2.
  • a motor 10 drives the blower wheel 11 at a suitable speed, so that the air is thrown against the channel wall, whereby the water is separated and is collected as down-flow through the channel via openings 10 in the guide plate 9.
  • the downwardly flowing liquid 16 finally ends in the tray 5 as polluted liquid 17.
  • the fine drops in the air will be collected in a net 12, though which the air then passes before it is discharged as cleaned air 15 via the opening 13 at the top of the channel. Also the fine drops will be accumulated into liquid 16 which runs down into the tray 5.
  • the water which is discharged via the nozzles 3, may be admixed with neutralizing agents, as needed, in order to neutralize any aggressive substances in the air 4, just as disinfecting and all other conditioning agents may be added to the liquid.
  • the blower 10, 11 is started, and liquid supply to the nozzles 3 is turned on.
  • the air 4 will be sucked in at the bottom of the channel 2 and, in a wetted state, will pass up through the water mist zone 8.
  • the wetted air with the polluting substances suspended in liquid is conveyed via the guide plate 9 into the blower wheel 11 , and then the air is thrown outwards to form liquid 16 which runs downwards.
  • the partly dry air then passes through a fine-meshed net 12, where the fine drops below 40 ⁇ are captured and accumulated into liquid, which runs down into the tray.
  • the clean air 15 is then discharged through an upper opening 13.
  • the channel 2 is positioned vertically, but nothing prevents it from being oriented at an angle, provided that it allows the liquid 16 to run downwards to be collected at the bottom.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation Of Particles Using Liquids (AREA)

Abstract

According to the invention, the air (4) is cleaned in that it is first conveyed through a water mist zone (6) and then an absorption zone (8), in which the impurities are suspended in liquid, and finally the wetted air passes through a separation zone (14) in which the liquid is precipitated in order to run to a collection device. In this method, the air is cleaned and conditioned in a surprisingly simple and effective manner.

Description

WET TYPE AIR CLEANER
The prior art
The invention relates to a method of cleaning room air, such as indoor air and stable air, said room air being sucked out from the room by means of a fan which is mounted in an air channel. Moreover, the invention relates to an apparatus for performing the method.
Polluted air constitutes an increasing problem, partly because the pollution is unpleasant to smell, partly for hygienic reasons.
Therefore, many air cleaning systems have been developed. An example of a system is disclosed in EP 1082989 (Kadymov). The system of Kadymov comprises a chamber in which the polluted air is conveyed horizontally through the three zones. In the separation zone, rotor blades are used for striking the water drops. Each zone contains collection trays and drains for conveying the collected liquid to a central collection container.
A horizontal structure with several collection trays and drains is difficult to construct and is not suitable for e.g. small rooms, where the available space only allows compact air cleaning systems.
Another example of an air cleaning system is disclosed in SU 969298 (Kamenev). The system of Kamenev likewise uses a rotor for striking the air, so that the water drops are separated. The separated water drops are then collected in a central tray at the bottom of the chamber.
The air is sucked into the top of the chamber. This, however, is not very expedient since the heavy polluted air is present lowermost in a room and must therefore be sucked into the bottom of the chamber. At the same time, the cleaned air must be pumped out at the top of the chamber. Therefore, it is not expedient to construct the system in this manner.
In addition, the system of Kamenev does not allow the water drops to be mixed properly with the air, since the chamber does not contain any absorption zone. Consequently, it is not possible to separate the harmful particles from the air.
The object of the invention
The object of the invention is to remedy these defects, and this is achieved according to the invention when the room air, after having been sucked into the air channel, is wetted by passing through a water mist zone, following which the wetted air passes through an absorption zone in which impurities are absorbed in the water drops, following which air and water drops are separated in an separation zone, preferably in the form of a centrifugation, in which the drops are thrown against the channel wall, following which the water drops/the water run down to be collected at the channel bottom, while the cleaned air is discharged from the channel.
Thus, by allowing the room air to pass through various zones in said order, the air will be cleaned of impurities as well as gases in a surprisingly simple manner and finally be discharged as cleaned and conditioned air having a suitably low air moisture.
The pollution is suspended in the drops in the wetting chamber in the wetting zone and is then passed through a separation chamber, in which the drops are collected and then slide down along the interior of the channel wall in liquid form.
The polluted water may hereby be collected and subsequently be cleaned with a view to recycling, etc.
The operational costs are limited to the sprinkler liquid and the power for driving fan, which results in minimum operational costs. To this should be added the low noise generation involved by the method, and that the system has a relatively compact structure.
When, as stated in claim 2, the air affected by the centrifugal force is allowed to pass through a net filter, even fine liquid drops will be trapped by the net and will then, after accumulation into larger "independent" drops, run down the net side for collection.
Finally, it is expedient, as stated in claim 3, to use a centrifugal blower arranged between the absorption and separation zones, as the air velocity through the channel is thereby adapted to the optimum velocities in the individual zones.
The drawing
An example of an embodiment of an air cleaner according to the invention will be described more fully below with reference to the drawing, which shows a cross-section through an embodiment.
Description of an exemplary embodiment
The air cleaning apparatus according to the invention will be described first, and then the method of performing the cleaning will be described.
The air cleaner 1 is mounted in an upright channel 2, in which there is an inlet at the bottom for the air 4 which is to be cleaned. A base 5 is configured at the bottom as a collection tray for the liquid 17 which is an end product of the cleaning.
Nozzles 3 are mounted at the lower part of the channel, which emit a water mist for wetting the air 4 when this passes through the wetting zone 6.
Above this wetting zone 6, there is a relatively long length of channel 8 which constitutes an absorption zone, in which the content of polluted substances and vapours of the air 7 are absorbed by the liquid in drop shape.
At the top, a guide plate 9 is arranged for the moisture-containing air, which is then conveyed into a blower wheel 11 , which partly sucks the air 7, partly imparts to it a centrifugal movement outwards toward the channel wall 2.
A motor 10 drives the blower wheel 11 at a suitable speed, so that the air is thrown against the channel wall, whereby the water is separated and is collected as down-flow through the channel via openings 10 in the guide plate 9. The downwardly flowing liquid 16 finally ends in the tray 5 as polluted liquid 17.
The fine drops in the air will be collected in a net 12, though which the air then passes before it is discharged as cleaned air 15 via the opening 13 at the top of the channel. Also the fine drops will be accumulated into liquid 16 which runs down into the tray 5.
Further, this downward percolation of liquid keeps the interior of the channel clean.
The water, which is discharged via the nozzles 3, may be admixed with neutralizing agents, as needed, in order to neutralize any aggressive substances in the air 4, just as disinfecting and all other conditioning agents may be added to the liquid.
The method will now be described.
First, the blower 10, 11 is started, and liquid supply to the nozzles 3 is turned on.
Then, the air 4 will be sucked in at the bottom of the channel 2 and, in a wetted state, will pass up through the water mist zone 8.
The wetted air with the polluting substances suspended in liquid is conveyed via the guide plate 9 into the blower wheel 11 , and then the air is thrown outwards to form liquid 16 which runs downwards. The partly dry air then passes through a fine-meshed net 12, where the fine drops below 40 μ are captured and accumulated into liquid, which runs down into the tray.
The clean air 15 is then discharged through an upper opening 13.
In the shown and described system, the channel 2 is positioned vertically, but nothing prevents it from being oriented at an angle, provided that it allows the liquid 16 to run downwards to be collected at the bottom.

Claims

PATENT CLAIMS
1. A method of cleaning room air, such as indoor air and stable air, said room air (4) being sucked into the bottom of an upright air channel (2) by means of a fan (11 ) which is mounted at the top of the air channel (2), said room air (4), after having been sucked into the air channel (2), being wetted by passing through a water mist zone (6), following which the wetted air passes through an absorption zone (8) in which impurities are absorbed in the water drops, following which air and water drops are separated in a separation zone (14), preferably in the form of a centrifugation, in which the drops are thrown against the channel wall (2), following which the water drops/the water (16) run down to be collected at the channel bottom (5), while the cleaned air (15) is discharged at the top from the channel (2).
2. An apparatus for performing the method according to claim 1 , wherein the centrifugal zone (14) comprises a net cylinder (12) which captures the drops, including the very small water drops, before the air is discharged from the channel (2).
3. An apparatus for performing the method according to claim 1 , wherein the fan (11 ) for centrifugation is mounted in an upright channel (2) between the absorption zone (8) and the separation zone (14), said fan (11 ) being driven by a motor (10).
PCT/DK2007/000371 2006-08-14 2007-08-13 Wet type air cleaner WO2008019686A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200601054A DK176880B1 (en) 2006-08-14 2006-08-14 air cleaner
DKPA200601054 2006-08-14

Publications (1)

Publication Number Publication Date
WO2008019686A1 true WO2008019686A1 (en) 2008-02-21

Family

ID=38657093

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2007/000371 WO2008019686A1 (en) 2006-08-14 2007-08-13 Wet type air cleaner

Country Status (2)

Country Link
DK (1) DK176880B1 (en)
WO (1) WO2008019686A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104329734A (en) * 2014-09-18 2015-02-04 青岛海尔空调器有限总公司 Air treatment system
CN105042728A (en) * 2015-07-10 2015-11-11 深圳市爱品生电子科技有限公司 Dust filtering and sterilizing device for indoor air
CN105327586A (en) * 2015-11-27 2016-02-17 无锡市华尔泰机械制造有限公司 Air filter with noise absorption and reduction functions
WO2016144172A1 (en) * 2015-03-09 2016-09-15 Hazeleger Investments B.V. Filter installation for filtering a gas such as air, animal accommodation provided therewith and corresponding method
CN107084447A (en) * 2014-07-03 2017-08-22 青岛海尔空调器有限总公司 Air treatment system
WO2019078718A3 (en) * 2017-10-18 2019-06-06 Blue Economy Systems B.V. Filter system, installation such as an animal accommodation provided therewith, and method therefor
CN110946115A (en) * 2019-12-27 2020-04-03 江苏省农业科学院 Pig raising method adopting detachable cleaning wet curtain

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519436A (en) * 1937-09-24 1940-03-27 Anton Axel Romanus Fastborg Improvements in methods and apparatus of cleaning flue gases by washing
GB632654A (en) * 1945-08-27 1949-11-28 Herman Rathgeb An improved apparatus for washing gases
US3853515A (en) * 1973-01-05 1974-12-10 Palmer B Clean air smoke scrubber
DE2528322B1 (en) * 1975-06-25 1976-08-19 Rimu Lueftungstechnik Philipp Air purification device for stable exhaust air
DE2841066A1 (en) * 1978-09-21 1980-04-03 Gerhard Dipl Ing Ing Waechter Air purifier scrubber - with transverse sprays and built in biological liquid reconditioner
FR2518894A1 (en) * 1981-12-24 1983-07-01 Lautrette & Cie Sa Centrifugal air filter - removes coarse dust particles using helicoidal air motion induced by axial flow fan impeller
US6132493A (en) * 1998-08-05 2000-10-17 Church; C. Daniel Apparatus and method for washing air with a liquid without an eliminator
WO2005061078A1 (en) * 2003-12-22 2005-07-07 Turbovent A/S Air cleansing apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519436A (en) * 1937-09-24 1940-03-27 Anton Axel Romanus Fastborg Improvements in methods and apparatus of cleaning flue gases by washing
GB632654A (en) * 1945-08-27 1949-11-28 Herman Rathgeb An improved apparatus for washing gases
US3853515A (en) * 1973-01-05 1974-12-10 Palmer B Clean air smoke scrubber
DE2528322B1 (en) * 1975-06-25 1976-08-19 Rimu Lueftungstechnik Philipp Air purification device for stable exhaust air
DE2841066A1 (en) * 1978-09-21 1980-04-03 Gerhard Dipl Ing Ing Waechter Air purifier scrubber - with transverse sprays and built in biological liquid reconditioner
FR2518894A1 (en) * 1981-12-24 1983-07-01 Lautrette & Cie Sa Centrifugal air filter - removes coarse dust particles using helicoidal air motion induced by axial flow fan impeller
US6132493A (en) * 1998-08-05 2000-10-17 Church; C. Daniel Apparatus and method for washing air with a liquid without an eliminator
WO2005061078A1 (en) * 2003-12-22 2005-07-07 Turbovent A/S Air cleansing apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107084447A (en) * 2014-07-03 2017-08-22 青岛海尔空调器有限总公司 Air treatment system
CN104329734A (en) * 2014-09-18 2015-02-04 青岛海尔空调器有限总公司 Air treatment system
WO2016041263A1 (en) * 2014-09-18 2016-03-24 青岛海尔空调器有限总公司 Air treatment system
CN104329734B (en) * 2014-09-18 2018-01-05 青岛海尔空调器有限总公司 Air treatment system
WO2016144172A1 (en) * 2015-03-09 2016-09-15 Hazeleger Investments B.V. Filter installation for filtering a gas such as air, animal accommodation provided therewith and corresponding method
NL2014424B1 (en) * 2015-03-09 2016-10-13 Hazeleger Invest B V Filter installation for filtering a gas such as air, shed provided with it and corresponding method.
CN105042728A (en) * 2015-07-10 2015-11-11 深圳市爱品生电子科技有限公司 Dust filtering and sterilizing device for indoor air
CN105327586A (en) * 2015-11-27 2016-02-17 无锡市华尔泰机械制造有限公司 Air filter with noise absorption and reduction functions
CN105327586B (en) * 2015-11-27 2017-05-31 无锡市华尔泰机械制造有限公司 A kind of air cleaner with sqouynd absorption lowering noise function
WO2019078718A3 (en) * 2017-10-18 2019-06-06 Blue Economy Systems B.V. Filter system, installation such as an animal accommodation provided therewith, and method therefor
CN110946115A (en) * 2019-12-27 2020-04-03 江苏省农业科学院 Pig raising method adopting detachable cleaning wet curtain
CN110946115B (en) * 2019-12-27 2022-03-01 江苏省农业科学院 Pig raising method adopting detachable cleaning wet curtain

Also Published As

Publication number Publication date
DK176880B1 (en) 2010-02-15
DK200601054A (en) 2008-02-15

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