Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
  • B01D5/0027—Condensation of vapours; Recovering volatile solvents by condensation by direct contact between vapours or gases and the cooling medium
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
  • B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
  • B01D5/0072—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with filtration
• • 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
  • B01D53/02—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 adsorption, e.g. preparative gas chromatography
  • B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
• • 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
  • B01D53/1487—Removing organic compounds
• • 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
• • 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
  • B01D53/38—Removing components of undefined structure
  • B01D53/44—Organic components
• • 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
  • B01D53/77—Liquid phase processes
  • B01D53/78—Liquid phase processes with gas-liquid contact
• • 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
  • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
  • A61L2209/10—Apparatus features
  • A61L2209/14—Filtering means
• • 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
  • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
  • A61L2209/20—Method-related aspects
  • A61L2209/22—Treatment by sorption, e.g. absorption, adsorption, chemisorption, scrubbing, wet cleaning
• • 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
  • A61L9/14—Disinfection, sterilisation or deodorisation of air using sprayed or atomised substances including air-liquid contact processes
  • A61L9/145—Disinfection, sterilisation or deodorisation of air using sprayed or atomised substances including air-liquid contact processes air-liquid contact processes, e.g. scrubbing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
  • B01D2252/10—Inorganic absorbents
  • B01D2252/103—Water
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
  • B01D2253/10—Inorganic adsorbents
  • B01D2253/102—Carbon
• • 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
  • B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2258/00—Sources of waste gases
  • B01D2258/05—Biogas
• • 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

Definitions

• the present invention relates to the field of gas treatment such as air and biogas, and especially the treatment of stale air.
• the present invention relates to the removal of odor and volatile organic compounds (VOCs) odor of stale gas.
• VOCs volatile organic compounds
• the present invention also relates to the pretreatment of biogas.
• biofiltration methods are known. These processes require maintaining and controlling the operating conditions. In addition, the air flow to be treated must be continuous and constant.
• Gas washing processes and associated scrubbers are also known. These methods and devices may be lost water, in which case the consumption of water is substantial and odors removal efficiencies relatively limited.
• gas scrubbers using organic solvents which exhibit better removal efficiencies of hydrophobic VOCs. Nevertheless, the use of organic solvents makes the processes more expensive and complex.
• organic solvents requires increased control of the treatment process.
• chemical scrubbers which have very high elimination efficiencies on some specific odorous compounds, but almost harmful on the majority of VOCs.
• thermal oxidation processes Also known in the state of the art thermal oxidation processes. These processes require heavy devices that require regular maintenance and high maintenance costs.
• An object of the invention is in particular to overcome the disadvantages of the methods and devices of the state of the prior art.
• An object of the invention is in particular:
• VOCs and odors in particular, but not exclusively, odorous VOCs contained in polluted air, and / or
• stale gas in particular stale air and biogas
• VOC concentrations and / or
• Another object of the invention is to propose a method allowing the additional elimination:
• filtering unit in particular by adsorption
• the process according to the invention comprises an absorption step, commonly referred to as a washing step, followed by an adsorption step, referred to as a gas filtration step, whereas the known processes described above comprise a filtration step of particles, followed by a humidification step and then a biological treatment step (or biofiltration).
• stale gas means a gas contaminated with pollutants such as VOCs and / or odor molecules and / or dust. It may in particular be hydrophilic VOCs, including VOCs odorous.
• Stale gas may in particular be biogas - that is to say methane from the fermentation of sludge and / or waste, contaminated in particular by pollutants as defined above.
• the process of the invention makes it possible in particular to purify the biogas, that is to say to increase its concentration of methane (CH 4 ).
• stale air can be defined as polluted air, that is to say charged with pollutants, such as for example but not exclusively VOCs (especially odorous), dust or odors . It is an air resulting, for example but not exclusively, from an industrial process.
• the method according to the invention is characterized in that it comprises, in the contactor, bringing into contact a circulating liquid with the stale gas, said circulating liquid having a temperature of between 2 and 15 ° C., preferably between 5 and 10 ° C.
• the gas in particular air is no longer described as stale from the moment it has been subjected to the process according to the invention.
• the gas (especially air) is considered treated from the moment it has been subjected to the process according to the invention, that is to say that it meets the emission standards.
• contactor a gas / liquid contactor.
• a gas / liquid contactor is a means well known to those skilled in the art who seeks to recover a compound (s) contained in a gas via a liquid which will then be recovered.
• the contactor gas / liquid makes it possible to extract one or more compounds contained in a gas by carrying out a transfer of mass from a gaseous phase, ie the stale gas, to a liquid phase, ie the circulating liquid.
• the operation of a contactor typically consists of:
• the gas / liquid contactor may contain a lining, intended to increase the exchange surface between the stale gas and the circulating liquid, to promote mass transfer (or washing).
• the gas / liquid contactor does not contain a solid adsorbent support arranged for adsorbing on its surface pollutants such as VOCs and / or odor molecules and / or dust contained in the stale gas.
• the gas / liquid contactor does not contain activated carbon.
• the step of circulating the stale gas in the gas / liquid contactor is intended to reduce the amount of pollutants such as VOCs and / or odor molecules and / or dust contained in the stale gas by transfer into the liquid. flowing.
• this step of the process is similar to a step of physicochemical washing of the stale gas using the circulating liquid.
• the phenomenon implemented is therefore typically absorption.
• One of the advantages of the process according to the invention is that it does not include a step of biological treatment (biofiltration) of the stale gas.
• filter unit means a filtration unit based on purely physical phenomena such as adsorption (physisorption).
• adsorption physisorption
• the liquid flowing in the contactor may be water, oil or an organic solvent.
• the liquid circulating in the contactor may be water, especially industrial water.
• the industrial water may be filtered, preferably the industrial water may be filtered between 25 and 750 ⁇ m, more preferably between 150 and 350 ⁇ m.
• the liquid flowing in the contactor may be water from a cooling device arranged to cool water.
• the cooling device can be fed with industrial water.
• a flow rate of the liquid circulating in the contactor with respect to a flow rate of the exhaust air circulating in the contactor may be less than 20 l / m 3 , preferably less than 10 l / m 3 .
• This flow rate is commonly designated by those skilled in the art by the term liquid to gas ratio.
• the circulation of the gas (including air) stale in the contactor may include a circulation of gas (including air) stale in a direction opposite to a direction in which the liquid flows in the contactor.
• the flow of foul air in the contactor can comprise:
• the step of circulating the stale gas in a direction identical to a direction in which the liquid circulates in the contactor is implemented prior to the step of circulating the stale gas in a direction contrary to a direction in which the liquid flows in the contactor.
• the method according to the invention can comprise:
• co-current part an injection of the gas (in particular air) stale in a first part of the contactor, called co-current part, in which the stale gas flows in the same direction as the direction in which the liquid flows in said first part of the contactor
• the method can include:
• the stale gas circulates in the same direction as the direction in which the liquid circulates in the said first part;
• the stale gas (in particular air) injected into the contactor may have a temperature greater than 5 ° C., in particular between 5 and 80 ° C.
• the stale gas injected into the contactor may have a temperature of between 15 and 60 ° C, even more preferably between 35 and 55 ° C.
• the stale gas (in particular air) injected into the contactor may have a temperature of between 40 and 50 ° C.
• the exhaust air injected into the contactor may have a temperature of 25 and 35 ° C.
• the method may comprise bringing the stale gas (especially air) into contact with the liquid flowing in the contactor with a heat exchanger.
• the step of contacting the stale gas and the liquid circulating in the contactor with the heat exchanger may be implemented, in whole or in part, concomitantly with the flow stage of the stale gas at co-current. of the liquid circulating in the contactor, in other words, in the first part of the contactor.
• the process may comprise a circulation of a cooling liquid in the heat exchanger, said coolant having a temperature between 2 and 15 ° C, preferably between 3 and 10 ° C.
• the coolant may have a temperature of 5 ° C. Even more preferably, the temperature of the coolant may be equal to the temperature of the liquid flowing in the contactor.
• the coolant can be recovered for:
• the coolant can be water.
• the coolant may be industrial water.
• the industrial water may be filtered, preferably the industrial water may be filtered between 25 and 750 ⁇ m, more preferably between 150 and 350 ⁇ m.
• the coolant may be water from a cooling device arranged to cool water.
• the coolant may be water from a cooling device arranged to cool water.
• the cooling device can be fed with industrial water.
• the coolant may be a refrigerant, such as glycol, ethylene glycol or monoethylene glycol (MEG), preferably MEG.
• a refrigerant such as glycol, ethylene glycol or monoethylene glycol (MEG), preferably MEG.
• the method may comprise:
• the process may comprise:
• the method may comprise a recovery of the liquid having circulated in the contactor.
• the recovered liquid having circulated in the contactor, can be evacuated for processing and / or subsequent recycling.
• the method may include a step of heating the gas (including air) stale prior to the circulation of the stale gas in the filter unit.
• the step of heating the stale gas is carried out subsequently to the step of circulating the stale gas in the contactor.
• the exhaust gas may be heated to a temperature above 3 ° C., in particular between 5 and 35 ° C., preferably between 10 and 30 ° C.
• the exhaust gas can be heated to a temperature of 5 ° C higher than its outlet temperature of the contactor.
• the flow of the stale gas in the first part of the contactor can be effected in a descending swirling movement, or ascending respectively, around a central zone of the contactor and the flow of stale gas in the second part of the contactor can performing a substantially rectilinear upward or downward movement in the central zone of the contactor.
• the exhaust gas flow can be carried out at a flow rate of between 100 and 20000 m 3 / h, preferably between 250 and 10000 m 3 / h, more preferably between 500 and 5000 m 3. / h.
• a flow rate of between 100 and 20000 m 3 / h, preferably between 250 and 10000 m 3 / h, more preferably between 500 and 5000 m 3. / h.
• between 100 and 20000 m 3 preferably between 250 and 10000 m 3 , more preferably between 500 and 5000 m 3 are injected into the contactor and are recovered at the output of the contactor per hour.
• the process according to the invention can be used for the removal of odorous Volatile Organic Compounds (VOCs).
• the process can also be used for disposal:
• hydrophilic VOCs and / or
• the process is used for the treatment of stale air, in particular from:
• a stale gas (including air) treatment unit comprising:
• a gas / liquid contactor in which the stale gas circulates
• filter unit in which the stale gas circulates; said stale gas treatment unit being characterized in that it is arranged to implement the method according to the first aspect of the invention.
• Gas especially air is no longer called stale from the moment it has passed through the treatment unit.
• the gas in particular air, is considered treated from the moment it has passed through the processing unit as described according to the second aspect of the invention.
• the processing unit according to is arranged to implement the method according to the invention.
• the filter unit may be any device known to those skilled in the art and is preferably an activated carbon filter unit.
• the processing unit may comprise one or more contactors.
• the treatment unit is arranged so that a flow rate of the liquid circulating in the contactor with respect to a flow rate of the stale gas flowing in the contactor may be less than 20 l / m 3 , preferably less than 10 l / m 3. .
• the stale gas (especially air) treatment unit may be arranged so that a liquid circulating in the contactor is injected into a second part of the contactor, or respectively into a first part of the contactor, and that the liquid having was injected into the second part of the contactor is reinjected into the first part of the contactor, or respectively in the second part of the contactor,
• said liquid flowing in the contactor having a temperature of between 2 and 15 ° C, preferably between 5 and 10 ° C.
• the gas / liquid contactor is arranged so that the liquid flowing in the contactor comes into direct contact with the exhaust gas flowing in said contactor.
• the exhaust gas injected into the contactor may have a temperature greater than 5 ° C., in particular between 5 and 80 ° C.
• the stale gas injected into the contactor may have a temperature of between 15 and 60 ° C, even more preferably between 35 and 55 ° C.
• the exhaust gas injected into the contactor may have a temperature of between 40 and 50 ° C.
• the liquid flowing in the contactor may be water, oil or an organic solvent.
• the circulating liquid is water, especially industrial water.
• the first part of the contactor can be arranged so that the stale gas flows in the same direction as a direction in which the liquid flowing in the contactor flows in said first part of the contactor, and the second part of the contactor, said countercurrent, can be arranged so that the stale gas flows in a direction opposite to a direction in which the liquid flowing in the contactor circulates in said second part of the contactor.
• the second part of the contactor can be a central zone of the contactor in which the flow of the exhaust gas can be effected in a substantially straight upward or downward movement
• the first part of the contactor can be a peripheral zone of the contactor. contactor wherein the flow of the stale gas can be effected in a downward swirling movement, or ascending respectively, around the first part.
• the central zone may extend along a central axis of the contactor.
• the central axis may be an axis of revolution of the contactor.
• the second part of the contactor can extend from an outer edge of the central zone to an inner edge of the contactor.
• the stale gas treatment unit (in particular air) may comprise a heat exchanger arranged so that the stale gas and the liquid flowing in the contactor come into contact with an exchange surface of the exchanger inside. which circulates a cooling liquid whose temperature is between 2 and 15 ° C, preferably between 5 and 10 ° C.
• the coolant may be water or a refrigerant, as defined above in connection with the method of the invention.
• the treatment unit can be arranged in such a way that the stale gas, in particular the stale air:
• the stale gas treatment unit can be arranged so that the liquid circulating in the contactor is recovered for processing and / or subsequent recycling.
• the stale gas treatment unit may comprise a stale gas heating element arranged so that the stale gas is heated before entering the filter unit.
• the heating element may be any heating means known to those skilled in the art, and may in particular comprise a hot filament disposed on the stale gas circulation path.
• the contactor can be any type of contactor known to those skilled in the art.
• the contactor may be of the type: sputtering column, packed column, bubble column, plate column, falling film column or cyclone.
• the contactor is a contactor type "cyclonic exchanger".
• the stale gas treatment unit in particular stale air, can be arranged for the elimination, inter alia, of Volatile Organic Compounds (VOCs) (in particular odorous) contained in the stale air, in particular stale air.
• VOCs Volatile Organic Compounds
• the stale gas treatment unit (in particular stale air) can be arranged in such a way that the exhaust gas circulates at a flow rate of between 100 and 20000 m 3 / h, preferably between 2500 and 10000 m 3 / h. preferably between 500 and 5000 m 3 / h.
• the stale gas treatment unit in particular stale air, may comprise a device for cooling the water injected into the contactor and / or into the heat exchanger.
• the cooling device may be any cooling device arranged to cool water and / or produce cold, such as, inter alia, gas compression and / or gas absorption systems and / or pump systems. heat. Description of the Figures and Embodiments
• FIGURE 1 is a schematic representation of a first embodiment of the method and the processing unit according to the invention.
• FIGURE 2 is a schematic representation of a second embodiment of the processing unit and method according to the invention.
• variants of the invention comprising only a selection of characteristics described, isolated from the other characteristics described (even if this selection is isolated within a sentence including these other characteristics), if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
• This selection comprises at least one characteristic, preferably functional without structural details, or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art .
• FIGURE 1 in a first embodiment, a method of treatment according to the invention and a processing unit according to the invention are described.
• FIGURE 1 there is shown a method of treating odors and VOCs of stale air resulting from a waste water treatment process or waste treatment facilities.
• Stale air 3 is introduced 1 into the treatment unit 13 at a temperature between 35 ° C and 55 ° C.
• the method comprises a circulation 31, 32 of the exhaust air 3 in a gas / liquid contactor 2, said contactor 2 and a circulation 4 of the exhausted air in a filter unit 5, called the filter unit 5.
• the method comprises, contacting a flowing liquid 6 61, 62 in the contactor 2 with the exhaust air 3 flowing 31, 32 in the contactor 2.
• the circulating liquid 61, 62 has a temperature of 5 to 10 ° C. This temperature can, in some cases, vary between 2 and 15 ° C.
• the placing in contact of the circulating liquid 61, 62 in the contactor 2 with the stale air 3 circulating 31, 32 in the contactor 2 is put in direct contact.
• the flowing liquid 6 61, 62 in the contactor 2 is water.
• the circulation 31, 32 of the stale air 3 in the contactor 2 comprises a circulation 32 of the stale air 3 in a direction opposite to a direction 61 in which the liquid 6 circulates in the contactor 2.
• the flow rate of the circulating liquid 61, 62 in the contactor 2 relative to the stale air flow 3 flowing in the contactor 2 is less than 10 l / m 3 .
• the flow rate of the circulating liquid 61, 62 in the contactor 2 with respect to the stale air flow 3 flowing in the contactor 2 is 2 to 4 ml / m 3 , advantageously 3 l / m 3 .
• the flowing liquid 6 61, 62 in the contactor 2 flows in a single vertical direction 67 in which the liquid 6 flows.
• the circulation 31, 32 of the stale air 3 in the contactor 2 comprises a circulation 31 of the stale air 3 in a direction identical to the direction 61 in which the liquid 6 flows in the contactor 2 and a circulation 32 of the air stale 3 in a direction contrary to the direction 62 in which the liquid 6 flows in the contactor 2.
• the circulation stage 31 of the stale air 3 in a direction identical to the direction 61 in which the liquid 6 flows in the contactor 2 is implemented prior to the circulation stage 32 of the exhaust air 3 in a direction opposite to the direction 62 in which the liquid 6 flows in the contactor 2.
• the method according to the invention comprises the injection 1 of the exhausted air 3 in a first part 21 of the contactor 2, called co-current part 21, in which the stale air 3 circulates 31 in the same direction as the direction in which the liquid 6 circulates 61 in said first portion 21 of the contactor 2. Equivalently, this step can be described as a circulation 31 of the exhaust air 3 to co-flow of the liquid 6 flowing 61 in the contactor 2. Then , the method comprises a circulation 32 of the exhaust air 3 in a second part 22 of the contactor 2, called the counter-current part 22, in which stale air circulates 32 in the opposite direction to the direction in which the liquid 6 circulates 62 in said second portion 22 of the contactor 2.
• this step can be described as a circulation 32 of the stale air 3 against circulating liquid 62 in the contactor 2.
• the process comprises a circulation 4 of the stale air 3 in the filter unit 5.
• the process comprises the rejection 16 of treated air 17.
• the method comprises a step 9 for heating the stale air 3 prior to the circulation 4 of the stale air 3 in the filtering unit 5.
• the heating step 9 of the exhaust air 3 is thus implemented subsequent to the circulation stage 61 of the liquid 6 in the first part 21 of the contactor 2.
• the stale air 3 is heated to a temperature of 5 ° C higher than its temperature at the output of the contactor 2.
• the method comprises an injection 63 in the first part 21 of the contactor 2 of the circulating liquid 6 61, 62 in the contactor 2, followed by a recovery 66 of the liquid 6 having circulated 61 in the first part 21 of the contactor 2.
• the recovery 66 the liquid 6 is followed by a reinjection 64 in the second part 22 of the contactor 2 of the liquid 6 having circulated 61 in the first part 21 of the contactor 2.
• the method comprises a recovery 65 of the liquid 6 having circulated 61, 62 in the contactor 2.
• the recovered liquid 65, circulated 61, 62 in the contactor 2, is evacuated for processing and / or subsequent recycling.
• the method comprises bringing into contact 7 the stale air 3 flowing 31, 32 in the contactor 2 and the flowing liquid 6 61, 62 in the contactor 2 with a heat exchanger 8.
• the liquid 10 flowing in the heat exchanger is water.
• the step of bringing into contact 7 the stale air 3 and the circulating liquid 6 31, 32, 61, 62 in the contactor 2 with the heat exchanger 8 is implemented concomitantly with the circulation step 31 of the stale air 3 to co-current of the liquid 6 flowing 61 in the contactor 2.
• the step of bringing into contact 7 the stale air 3 and the circulating liquid 6 31, 32, 61, 62 in the contactor 2 with the heat exchanger 8 is implemented in the first part 21 of the contactor 2.
• the coolant 10 flowing in the heat exchanger 8 has a temperature of between 5 and 10 ° C. This temperature can, in some cases, vary between 2 and 15 ° C.
• the injected cooling liquid 101 in the heat exchanger 8 is identical to the injected liquid 6 in the contactor 2.
• the injected cooling liquid 101 in the exchanger 8 and the injected liquid 6 in the contactor 2 come from a refrigerant unit 11 supplied with industrial water 12.
• the coolant 10 is recovered 102, at the outlet of the heat exchanger 8, and is reinjected 103 into the circuit of the coolant 10. According to the invention, the liquid 10 is reinjected 103 at the refrigerating unit 11.
• FIGURE 2 in a second embodiment, a processing unit according to the invention and a method according to the invention are described.
• FIG. 2 shows a treatment unit 13 for stale air 3.
• the treatment unit 13 comprises a gas / liquid contactor 2, called a contactor 2, in which circulates 31, 32 the stale air 3 and a filter unit 5 in which the polluted air 4 circulates 3.
• the treatment unit 13 is arranged in such a way that the stale air 3 circulates 31, 32 in the contactor 2 and then flows 4 in the filtering unit 5.
• L stale air 3 is injected 1 into the first part 21 of the contactor 2.
• the stale air is injected 1 into the contactor 2 at a temperature between 35 and 55 ° C.
• the treated air 16 at the outlet of the treatment unit 13 is released into the atmosphere.
• the stale air treatment unit 13 is arranged to implement the method according to the invention.
• the filter unit 5 is an activated carbon filter unit 5.
• the stale air treatment unit 13 is arranged so that the circulating liquid 61, 62 in the contactor 2 is injected 63 into a second part 22 of the contactor 2 and so that the liquid 6 having been injected 63 into the second 22 part of the contactor 2 is reinjected 64 in the first part 21 of the contactor 2.
• the circulating liquid 61, 62 in the contactor 2 has a temperature of 5 and 10 ° C. This temperature can, in some cases, vary between 2 and 15 ° C.
• the placing in contact of the circulating liquid 61, 62 in the contactor 2 with the stale air 3 circulating 31, 32 in the contactor 2 is put in direct contact.
• the injections 63 and 64 of liquid 6 in the contactor 2 are made by spraying via nozzles.
• the stale air treatment unit 3 is arranged such that the flow rate of the circulating liquid 61, 62 in the contactor 2 relative to the stale air flow 3 flowing in the contactor 2 is less than 10 l / m. 3 .
• the flow rate of the circulating liquid 61, 62 in the contactor 2 with respect to the exhaust air flow 3 flowing in the contactor 2 is between 2 and 4 L / m 3 , for example 3 l / m 3 .
• the flowing liquid 6 61, 62 in the contactor 2 is water.
• the circulating liquid 61, 62 in the contactor 2 flows in a single vertical direction 67 in which the liquid 6 flows by gravitation.
• the first part 21 of the contactor 2, said co-current 21, is arranged so that the stale air 3 circulates 31 in the same direction 67 as the direction in which the liquid 6 flowing 61, 62 in the contactor 2 circulates 61 in said first portion 21 of the contactor 2.
• the second portion 22 of the contactor 2, said against the current 22, is arranged so that the stale air 3 flows 32 in the opposite direction to the direction 62 in which the liquid 6 flowing 61, 62 in the contactor 2 flows 62 in said second portion 22 of the contactor 2.
• the contactor 2 is a contactor 2 of the "cyclone" type.
• the circulation 31 of the stale air 3 in the first part 21 of the contactor 2 is carried out in a swirling movement descending 31 around the central zone 22 of the contactor 2.
• the circulation 32 of the stale air 3 in the second part 22 of the contactor 2 is carried out in a substantially rectilinear upward movement 32 in the central zone 22 of the contactor 2.
• the contactor 2 of the "cyclone" type has a cylindrical shape.
• the central zone 22 extends along the axis of revolution of the contactor 2.
• the second portion 22 of the contactor extends from the outer walls of the central zone 22 to the inner walls 23 of the contactor 22, that is to say the inner walls 23 of the first part 21 of the contactor 2.
• the stale air treatment unit 13 comprises a heat exchanger 8 arranged so that the stale air 3 and the circulating liquid 6 31, 32, 61, 62 in the contactor 2 come into contact with an exchange surface the exchanger 8. Inside the exchange surface 81 circulates a cooling liquid 10 whose temperature is between 5 and 10 ° C. This temperature can, in some cases, vary between 2 and 15 ° C.
• the coolant 10 is water.
• the heat exchanger 8 is a tubular heat exchanger 8.
• the heat exchanger 8 comprises a circular bundle of tubes 81 extending around the central zone 22.
• the coolant 10 and the flowing liquid 6 61, 62 in the contactor 2 are recovered, respectively 102 and 66, in a tank 14 and then reinjected 64 in the first part 21 of the contactor 2.
• the tank 14 is part of a recirculation circuit.
• the injected cooling liquid 101 in the heat exchanger 8 is identical to the injected liquid 6, 63 in the contactor 2.
• the injected cooling liquid 101 and the injected liquid 6 come from a cooling unit 11 supplied with water. 12.
• the coolant and the circulating liquid 62 in the second portion 22 of the contactor 2 are recovered 102, 66 at the outlet of the heat exchanger 8, in a tank 14.
• the stale air treatment unit 13 is arranged so that the circulating liquid 61, 62 in the contactor 2 is recovered 65 for further processing.
• the liquid 6 is recovered 65 subsequent to the circulation 61 in the first part 21 of the contactor 2 of the reinjected liquid 6 64.
• the recovered liquid 65 having circulated 6, 61, 62 in the contactor 2, is evacuated with a view to its treatment and / or its subsequent recycling.
• the stale air treatment unit 3 comprises a heating element 9 of stale air 3 arranged so that the stale air 3 is heated before circulating 4 in the filter unit 5. Stale air 3 is heated at a temperature of 5 ° C above its temperature at the output of the contactor 2.
• the heating element 3 comprises a hot filament 15 arranged on the stale air circulation path 3 so as to heat the stale air 3.
• the main intended application, for the process and the treatment unit 13 is the treatment of odor and VOCs odorous
• the method and the processing unit 13 according to the invention also realize the elimination:
• hydrophilic VOCs and / or
• the main intended application, for the process and the treatment unit 13 is the treatment of foul air 3 from wastewater or sludge, in particular sludge from the treatment water or waste treatment facilities.
• the method and the processing unit 13 are also suitable for treating any type of stale air containing elements as mentioned above.
• the stale air 3 injected 1 in the contactor 2 has a temperature greater than 5 ° C.
• the stale air 3 when it is derived from water treatment process, it has a temperature above 18 ° C, especially between 40 ° C and 50 ° C.
• the process and the treatment unit 13 are suitable for the treatment of fouled air containing VOCs present at concentrations greater than 10 mg / m 3 , preferably between 10 and 1000 mg / m 3 , more preferably preferred between 10 and 500 mg / m 3 .
• the efficiency of the process and the treatment unit 13 is such that it allows a circulation 31, 32, 4 of stale air 3 at a flow rate between 100 and 20000 m 3 / h.
• the circulating 31, 32, 4 of stale air 3 is carried out at a flow rate of between 500 and 5000 m 3 / h. In other words, between 500 and 5000 m 3 are injected into the contactor 2 and are recovered at the output of the contactor 2, and therefore of the filter unit 5, per hour.
• the stale air 3 injected 1 into the contactor 2, or into the treatment unit 13, has a temperature greater than 5 ° C., and / or
• the stale air 3 injected 1 into the contactor 2, or into the treatment unit 13, has a temperature of between 15 and 60 ° C., and / or
• the stale air 3 injected 1 into the contactor 2, or into the treatment unit 13, has a temperature of between 5 and 80.degree. C., and / or
• the flow rate of the circulating liquid 61, 62 in the contactor 2 relative to the stale air flow rate 3 flowing in the contactor 2 is less than 20 l / m 3 , and / or
• the coolant 10 and / or the circulating liquid 61, 62 in the contactor 2 have a temperature of 5 ° C., and / or
• the temperature of the coolant 10 is equal to the temperature of the circulating liquid 61, 62 in the contactor 2, and / or
• the circulating liquid 61, 62 in the contactor 2 and / or the cooling liquid 10 is industrial water filtered at 250 ⁇ m, and / or
• the process comprises:
• the method comprises a step 9 for heating the stale air 3 before the circulation 4 of the stale air 3 in the filtering unit 5, and / or
• stale air 3 is heated to a temperature above 3 ° C, and / or stale air 3 is heated to a temperature between 5 and 35 ° C, preferably between 10 and 30 ° C, and / or
• stale air 3 is heated to a temperature of 25 ° C, and / or
• the coolant 10 is recovered 102, at the outlet of the heat exchanger 8, and is reinjected:
• the circulation 31 of the stale air 3 in the first part 21 of the contactor 2 is made in an upward swirling movement 31 around the central zone 22 of the contactor 2; the circulation 32 of the exhaust air 3 in the second part 22 of the contactor 2 is carried out in a substantially rectilinear downward movement 32 in the central zone 22 of the contactor 2, and / or the efficiency of the process and the unit 13 is such that it allows a circulation 31, 32, 4 stale air 3 at a rate between 250 and 10000 m 3 / h.
• the stale air treatment unit 3 is arranged such that the circulating liquid 61, 62 in the contactor 2 is injected 63 into a first part 21 of the contactor 2 and that the liquid 6 having been injected 63 into the first part 21 of the contactor 2 is reinjected 64 in the second part 22 of the contactor 2, and / or
• the refrigerating unit 11 can be any device arranged to produce cold, such as:
• the contactor is a contactor of type:
• the processing unit 13 comprises several contactors 2, and / or
• the processing unit 13 comprises several contactors 2, the contactors 2 are arranged in series.

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• 2018
  • 2018-02-21 FR FR1851488A patent/FR3077996B1/fr active Active
• 2019
  • 2019-02-21 WO PCT/EP2019/054323 patent/WO2019162383A1/fr not_active Ceased
  • 2019-02-21 EP EP19705200.4A patent/EP3755446A1/de not_active Ceased
  • 2019-02-21 CN CN201980014449.4A patent/CN111741800A/zh active Pending
  • 2019-02-21 US US16/971,583 patent/US20200384145A1/en not_active Abandoned

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