A method for treating impurities contained in exhaust gases of ships to reduce sulphur oxide and other emissions, includes scrubbing the exhaust gases in an exhaust gas scrubber and supplying wash water effluent exiting from the scrubber and containing impurities to a purification unit onboard a ship. In order for the method to purify wash water exiting the scrubber sufficiently enough to be discharged directly to sea, the purification unit includes a moving filter band, whereby an aqueous fluid containing impurities originating from the effluent is together with a precipitating agent fed to a surface of the inclined filter band and filtered there through to concentrate impurities onto the surface of the band filter as a precipitate. When necessary, the pH of the purified effluent is adjusted so that it is at least 6.5 before discharging the purified effluent into the sea or returning it to the exhaust gas scrubber.
B01D 46/00 - Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
C02F 1/52 - Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
F01N 3/04 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of liquids
C02F 1/44 - Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
C02F 9/00 - Multistage treatment of water, waste water or sewage
B63H 21/00 - Use of propulsion power plant or units on vessels
F01N 3/18 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operationControl
C02F 1/66 - Treatment of water, waste water, or sewage by neutralisationTreatment of water, waste water, or sewage pH adjustment
C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
The invention relates to an exhaust gas scrubber (1) for scrubbing exhaust gases of combustion engines, especially ship engines, of impurities, the exhaust gas scrubber having a feed channel (2) connected thereto for feeding exhaust gases containing impurities into the exhaust gas scrubber, and the exhaust gas scrubber comprising feeding devices (5) for feeding washing water into the exhaust gases in the exhaust gas scrubber, and a drop separator (10) arranged to form horizontal flow channels for the exhaust gases and to separate from the exhaust gases droplets flowing along with the exhaust gases before the purified exhaust gases are discharged from the exhaust gas scrubber. In order to be suitable for efficient purification of exhaust gases in a ship, the exhaust gas scrubber comprises a filler-containing bed-like structure (3) in which impurities attach to the washing water, the exhaust gases being arranged to move from a space (8) below the bed-like structure (3) to a space (9) above the bed-like structure and further to the drop separator (10). The invention also relates to a ship comprising an exhaust gas scrubber (1).
F01N 3/04 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of liquids
F01N 13/00 - Exhaust or silencing apparatus characterised by constructional features
The invention relates to an exhaust scrubber (1') for scrubbing the exhaust gases of combustion engines, especially ship engines, of impurities, the exhaust scrubber having a bed-like structure (3'), through which unscrubbed exhaust gases are fed, and feeding devices (5') for feeding washing water to the bed-like structure, whereby the exhaust gases are scrubbed as they pass through the bed-like structure. To ensure the desired operation of a combustion engine even in a situation where impurities have accumulated in the bed-like structure (3') to the extent that the flow of exhaust gases through the bed-like structure is prevented, the exhaust scrubber (1') has at least one by-pass path (6') for guiding exhaust gases containing impurities past the bed-like structure (3') and further out of the exhaust scrubber, the by-pass path being surrounded by a bed-like structure (3') and having blocking devices (10') for setting the by-pass path from its open position to its blocking position to prevent the flow of exhaust gases containing impurities through the by-pass path, and, vice versa, from the blocking position to the open position to allow the exhaust gases containing impurities to flow through the by-pass path. The invention also relates to a ship with an exhaust scrubber (1').
The invention relates to a method for treating impurities contained in exhaust gases of ships in order to reduce sulphur oxide emissions and other emissions, the method comprising scrubbing the exhaust gases in an exhaust gas scrubber (1) and supplying wash water to be purified, i.e. effluent, exiting from the exhaust gas scrubber and containing impurities to a purification unit (2) onboard a ship. In order for the method to purify wash water exiting from the exhaust gas scrubber efficiently enough for water that has undergone purification to be discharged directly into a sea and in order for the purification unit used in the method to be small enough to be readily placed onboard a ship, the purification unit (2) comprises a moving filter band, whereby an aqueous fluid containing impurities originating from the effluent is together with a precipitating agent fed to a surface of the inclined filter band of a band filter and filtered through the filter band in order to concentrate impurities contained in the fluid onto a surface of the band filter as a precipitate to be removed from the surface of the filter band. When necessary, a pH value of the purified effluent is adjusted so that it is at least 6.5 before the purified water is discharged into the sea or returned to the exhaust gas scrubber (1). The invention also relates to a ship and a purification unit.
B01D 53/92 - Chemical or biological purification of waste gases of engine exhaust gases
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
B01D 53/74 - General processes for purification of waste gasesApparatus or devices specially adapted therefor
F01N 3/033 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
F01N 3/04 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of liquids
B01D 33/048 - Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are pervious for filtering with endless filtering bands
B01D 29/09 - Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups Filtering elements therefor with filtering bands, e.g. movable between filtering operations
C02F 11/12 - Treatment of sludgeDevices therefor by de-watering, drying or thickening
C02F 1/52 - Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
C02F 1/66 - Treatment of water, waste water, or sewage by neutralisationTreatment of water, waste water, or sewage pH adjustment
B01D 61/00 - Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltrationApparatus, accessories or auxiliary operations specially adapted therefor
5.
METHOD FOR TREATING IMPURITIES CONTAINED IN EXHAUST GASES OF SHIPS, SHIP WITH A SCRUBBER, AND PURIFICATION UNIT
The invention relates to a method for treating impurities contained in exhaust gases of ships in order to reduce sulphur oxide emissions and other emissions, the method comprising scrubbing the exhaust gases in an exhaust gas scrubber (1) and supplying wash water to be purified, i.e. effluent, exiting from the exhaust gas scrubber and containing impurities to a purification unit (2) onboard a ship. In order for the method to purify wash water exiting from the exhaust gas scrubber efficiently enough for water that has undergone purification to be discharged directly into a sea and in order for the purification unit used in the method to be small enough to be readily placed onboard a ship, the purification unit (2) comprises a moving filter band, whereby an aqueous fluid containing impurities originating from the effluent is together with a precipitating agent fed to a surface of the inclined filter band of a band filter and filtered through the filter band in order to concentrate impurities contained in the fluid onto a surface of the band filter as a precipitate to be removed from the surface of the filter band. When necessary, a pH value of the purified effluent is adjusted so that it is at least 6.5 before the purified water is discharged into the sea or returned to the exhaust gas scrubber (1). The invention also relates to a ship and a purification unit.
B01D 53/14 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols by absorption
B01D 47/00 - Separating dispersed particles from gases, air or vapours by liquid as separating agent
6.
METHOD FOR TREATING IMPURITIES CONTAINED IN EXHAUST GASES OF SHIPS, SHIP WITH EXHAUST GAS SCRUBBER, AND PURIFICATION UNIT
The invention relates to a method for treating impurities contained in exhaust gases of ships in order to reduce sulphur oxide emissions and other emissions. In order for the method to be able to purify wash water exiting from an exhaust gas scrubber efficiently enough for water that has undergone the purification to be directly dischargeable into a sea, and in order for a purification unit used in the method to be small enough to be easily placed onboard a ship, exhaust gases are scrubbed in the exhaust gas scrubber (1) and wash water to be purified, containing impurities and exiting from the exhaust gas scrubber (1), i.e. effluent, is supplied to the purification unit (2) onboard a ship wherein the effluent is circulated in an effluent circuit (3), whereby effluent is filtered through a semipermeable membrane (7) of a membrane filter (4) in order to achieve purified effluent and a residue containing impurities, when necessary, the pH value of the purified effluent is adjusted to be at least 6.5, after which the purified effluent is discharged into the sea or returned to the exhaust gas scrubber (1) while the residue containing impurities is led back to the effluent circuit (3). The invention also relates to a ship and a purification unit.
B01D 53/00 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
B01D 47/00 - Separating dispersed particles from gases, air or vapours by liquid as separating agent
The invention relates to a method for treating impurities contained in exhaust gases of ships in order to reduce sulphur oxide emissions and other emissions. In order for the method to be able to purify wash water exiting from an exhaust gas scrubber efficiently enough for water that has undergone the purification to be directly dischargeable into a sea, and in order for a purification unit used in the method to be small enough to be easily placed onboard a ship, exhaust gases are scrubbed in the exhaust gas scrubber (1) and wash water to be purified, containing impurities and exiting from the exhaust gas scrubber (1), i.e. effluent, is supplied to the purification unit (2) onboard a ship wherein the effluent is circulated in an effluent circuit (3), whereby effluent is filtered through a semipermeable membrane (7) of a membrane filter (4) in order to achieve purified effluent and a residue containing impurities, when necessary, the pH value of the purified effluent is adjusted to be at least 6.5, after which the purified effluent is discharged into the sea or returned to the exhaust gas scrubber (1) while the residue containing impurities is led back to the effluent circuit (3). The invention also relates to a ship and a purification unit.
B01D 53/00 - Separation of gases or vapoursRecovering vapours of volatile solvents from gasesChemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
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