WO2015020519A1 - Scrubber, system and method for collecting emission from an exhaust gas - Google Patents

Scrubber, system and method for collecting emission from an exhaust gas Download PDF

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Publication number
WO2015020519A1
WO2015020519A1 PCT/NL2014/050520 NL2014050520W WO2015020519A1 WO 2015020519 A1 WO2015020519 A1 WO 2015020519A1 NL 2014050520 W NL2014050520 W NL 2014050520W WO 2015020519 A1 WO2015020519 A1 WO 2015020519A1
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WO
WIPO (PCT)
Prior art keywords
liquid
gas
exhaust gas
feed
water
Prior art date
Application number
PCT/NL2014/050520
Other languages
French (fr)
Inventor
Marcel Peter Johannes Wilhelmus CLEPHAS
Winfried Johannes Maria SANDERS
Patrick Peter Laurens SANDERS
Original Assignee
Aec Maritime B.V.
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 Aec Maritime B.V. filed Critical Aec Maritime B.V.
Publication of WO2015020519A1 publication Critical patent/WO2015020519A1/en

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Classifications

    • 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
    • B01D53/185—Liquid distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/16—Fractionating columns in which vapour bubbles through liquid
    • B01D3/18—Fractionating columns in which vapour bubbles through liquid with horizontal bubble plates
    • B01D3/20—Bubble caps; Risers for vapour; Discharge pipes for liquid
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/004—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • 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
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a scrubber, system and method for collecting emission from an exhaust gas, in particular a system for collecting exhaust gases coming from marine engines.
  • Such systems are per se known and usually comprise so-called scrubbers, wherein exhaust gases are guided through a filter pack.
  • scrubbers wherein exhaust gases are guided through a filter pack.
  • Examples of existing systems are given in US 2010/0224062 and US 2008/044335.
  • Drawbacks of the existing systems are a relatively high pressure drop, a higher energy consumption and a greater chance of contamination.
  • the invention provides for this purpose a so-called scrubber for collecting at least a part of the emission from an exhaust gas, comprising a hollow throughfeed body extending in vertical direction from its underside to its upper side; a liquid feed located on the upper side; an atomizer connected to the liquid feed for distributing the supplied liquid over the area of the cross-section of the throughfeed body; a gas feed located on the underside; a distributor located above the gas feed for distributing the supplied gas over the area of the cross- section of the throughfeed body; a liquid discharge located on the underside for discharging descended atomized liquid; a gas discharge for discharging exhaust gas from which the emission has been at least partially collected.
  • a hollow throughfeed body is understood to mean a throughfeed body in which an unimpeded passage for atomized liquid and exhaust gases is present between the feeds and discharges, which is therefore not, or not completely, obstructed by filters packs as is the case in the American patent US 3 781 407.
  • Atomizing of the liquid results in optimal contact between liquid and gas, and in an exceptionally high efficiency.
  • Such an atomizer can preferably be configured here to generate a mist distributed uniformly over the cross-section of the hollow throughfeed body.
  • An arrangement found suitable for this purpose is an arrangement wherein atomizers are disposed at or in the vicinity of the periphery of the throughfeed body and arrange the liquid in the throughfeed body with at least a directional component oriented toward a centre of the cross-section of the throughfeed body and/or toward each other.
  • a desirable droplet size lies between 1 and 2 mm, and in particular between 1.3 and 1.7 mm. Smaller droplets evaporate relatively quickly while larger droplets will on the contrary drop through the exhaust gases again.
  • the atomizers can particularly be disposed so that no or at least a minimum of liquid is sprayed directly against a wall of the throughfeed body, but precisely such that a greater part of the liquid is mixed via the interior of the hollow body and thus with the flow of exhaust gas.
  • a good distribution use can be made of a plurality of rings or polygons in which nozzles are disposed.
  • the distributor comprises a plurality of passage openings for the gas between which a device is placed for capturing and guiding descended atomized liquid to the liquid discharge.
  • passage openings for the gas contributes toward a uniform distribution of the gas over the cross-sectional surface of the throughfeed body, and thereby toward an improved interaction between liquid mist and exhaust gas, thereby increasing the efficiency of the atomizer.
  • the passage openings are formed by hollow protrusions which extend from a device which takes a substantially plate-like form and which is placed for the purpose of capturing and guiding descended atomized liquid to the liquid discharge.
  • the invention also relates to a system for collecting at least a part of the emission from an exhaust gas, comprising a scrubber according to any of the foregoing claims, wherein the gas feed is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein the liquid feed and liquid discharge are incorporated in a closed circuit formed by a process water tank from which water is supplied to the liquid feed and to which water from the liquid discharge is fed back.
  • a scrubber according to any of the foregoing claims, wherein the gas feed is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein the liquid feed and liquid discharge are incorporated in a closed circuit formed by a process water tank from which water is supplied to the liquid feed and to which water from the liquid discharge is fed back.
  • a closed system has the advantage that uncontrolled discharge of emission absorbed from the exhaust gases into the sea water is prevented. Contamination of the system, which can occur when direct use is made of seawater, can also be prevented.
  • the system has for this purpose the particular option of recovering water from the flue gases.
  • the liquid in the system according to the present invention is seawater, and the amount thereof can be replenished when for instance too large a part has disappeared through evaporation.
  • the closed circuit also comprises a cooler.
  • a cooler By preventing the temperature of the mist from rising as a result of repeated contact with exhaust gas the absorption capacity of the liquid can be optimized for emission from the exhaust gas. Cooling can for instance take place by means of heat exchange with seawater.
  • the process water tank comprises a control system for influencing the acidity of the process water.
  • One influencing option is formed here by the addition of NaOH to the process water.
  • a sensor for measuring the acidity can be provided.
  • a sensor for measuring electrical conductivity can also be provided, this conductivity being indicative of the amount of water to be added.
  • the system comprises a water treatment installation for treating water discharged from the process water tank.
  • a water treatment installation for treating water discharged from the process water tank.
  • Such an installation conditions waste process water such that a part thereof can be fed back to the seawater and another part, which may for instance comprise a residue, can be separately processed.
  • the water treatment installation can be provided with a sludge tank for collecting sludge separated from water discharged from the process water tank.
  • An alternative system according to the present invention comprises a scrubber as described above, wherein the gas feed is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein the liquid feed and liquid discharge are incorporated in an open circuit, wherein seawater is supplied to the liquid feed and wherein water from the liquid discharge is optionally fed back via a tank to the sea.
  • an exhaust gas such as the exhaust gas of a marine engine
  • Each of the systems can also be equipped with a gas analyser for analysing gases discharged by the gas discharge, and/or a water analyser for analysing water discharged by a water discharge to the sea.
  • FIG. 1 shows a schematic representation of a first system according to the
  • FIG. 1 shows a schematic representation of a second system according to the present invention for collecting at least a part of the emission from an exhaust gas
  • FIG. 3 shows a detail of the gas feed and water collector of a scrubber according to the present invention.
  • Figure 1 shows a system 1 for collecting at least a part of the emission from an exhaust gas, comprising a scrubber 2, wherein a gas feed 3 is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein liquid feed 4 and liquid discharge 5 are incorporated in a closed circuit formed by a process water tank 6 from which water is supplied to liquid feed 4 and to which water from liquid discharge 5 is fed back.
  • a gas feed 3 is configured to receive an exhaust gas, such as the exhaust gas of a marine engine
  • liquid feed 4 and liquid discharge 5 are incorporated in a closed circuit formed by a process water tank 6 from which water is supplied to liquid feed 4 and to which water from liquid discharge 5 is fed back.
  • the liquid in the system according to the present invention is seawater 8 and the amount thereof can be replenished 9 when too large a part has disappeared, for instance through evaporation.
  • the closed circuit also comprises a cooler 10 which is received between process water tank 6 and water feed 4. By preventing the temperature of the mist from increasing as a result of repeated contact with exhaust gas, the absorption capacity of the liquid for emission from the exhaust gas can be optimized. Cooling can for instance take place by means of heat exchange 11 with seawater 8.
  • the device can also be provided with a device 21 for measuring the conductivity of the process water, from which the acidity can for instance be derived.
  • Process water tank 6 also comprises a control system for influencing the acidity of the process water.
  • One influencing option is formed here by the addition of NaOH 12 to the process water.
  • the system also comprises a water treatment installation 13 for treating water discharged from process water tank 6.
  • a water treatment installation 13 for treating water discharged from process water tank 6.
  • Such an installation conditions waste process water such that a part thereof can be fed back to the seawater 8 and another part, which may for instance comprise a residue, can be processed separately.
  • the water treatment installation is provided with a sludge tank 14 for collecting sludge separated from water discharged from process water tank 6.
  • Figure 2 shows an alternative system 15 according to the present invention with a scrubber 16 as described above, wherein gas feed 17 is configured to receive an exhaust gas of a marine engine and wherein liquid feed 18 and liquid discharge 19 are incorporated in an open circuit, wherein seawater 19 is supplied to liquid feed 18 and wherein water from liquid discharge 19 is fed back via a vessel 20 to the sea.
  • gas feed 17 is configured to receive an exhaust gas of a marine engine and wherein liquid feed 18 and liquid discharge 19 are incorporated in an open circuit, wherein seawater 19 is supplied to liquid feed 18 and wherein water from liquid discharge 19 is fed back via a vessel 20 to the sea.
  • Each of the systems 1, 15 can also be equipped with a gas analyser for analysing gases discharged by the gas discharge and/or a water analyser for analysing water discharged by a water discharge to the sea.
  • FIG 3 shows the detail of the gas feed and water collector of a scrubber 2 according to the present invention.
  • the scrubber comprises a feed 22 for exhaust gas which debouches on the underside of the scrubber and which at its upward directed outer end debouches by means of a curvature into a flange 23, above which is provided a roof 24 sloping at an incline.
  • a distributor 25 Situated above the sloping roof is a distributor 25 with a plurality of passage openings 26 for the gas between which is placed a device for capturing and guiding descended atomized liquid to the liquid discharge 27 located substantially on the underside.
  • Passage openings 26 are formed by hollow protrusions extending from a device 25 which takes a substantially plate-like form and which is placed for the purpose of capturing and guiding descended atomized liquid to the laterally oriented liquid discharge 27.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The present invention relates to a scrubber for collecting at least a part of the emission from an exhaust gas, comprising a hollow throughfeed body extending in vertical direction from its underside to its upper side; a liquid feed located on the upper side; an atomizer connected to the liquid feed for distributing the supplied liquid over the area of the cross-section of the throughfeed body; a gas feed located on the underside; a distributor located above the gas feed for distributing the supplied gas over the area of the cross-section of the throughfeed body; a liquid discharge located substantially on the underside for discharging descended atomized liquid; a gas discharge for discharging exhaust gas from which the emission has been at least partially collected, optionally provided with a droplet collector for reducing the discharge of liquid particles. The invention also relates to a system and method.

Description

Scrubber, system and method for collecting emission from an exhaust gas
The present invention relates to a scrubber, system and method for collecting emission from an exhaust gas, in particular a system for collecting exhaust gases coming from marine engines.
Such systems are per se known and usually comprise so-called scrubbers, wherein exhaust gases are guided through a filter pack. Examples of existing systems are given in US 2010/0224062 and US 2008/044335.
The American patent US 3 781 407 also expressly describes the presence of such filter packs, as can also be seen under reference numerals 7, 7', 7a and 7b in the figures.
The systems referred to here have drawbacks however, such as relatively high costs of maintenance and use through having to service the filter packs, and a relatively low efficiency, whereby more emission still takes place than is desirable.
Drawbacks of the existing systems are a relatively high pressure drop, a higher energy consumption and a greater chance of contamination.
It is therefore an object of the present invention to at least partially obviate the above stated drawbacks, or to provide a usable alternative. The invention provides for this purpose a so-called scrubber for collecting at least a part of the emission from an exhaust gas, comprising a hollow throughfeed body extending in vertical direction from its underside to its upper side; a liquid feed located on the upper side; an atomizer connected to the liquid feed for distributing the supplied liquid over the area of the cross-section of the throughfeed body; a gas feed located on the underside; a distributor located above the gas feed for distributing the supplied gas over the area of the cross- section of the throughfeed body; a liquid discharge located on the underside for discharging descended atomized liquid; a gas discharge for discharging exhaust gas from which the emission has been at least partially collected.
A hollow throughfeed body is understood to mean a throughfeed body in which an unimpeded passage for atomized liquid and exhaust gases is present between the feeds and discharges, which is therefore not, or not completely, obstructed by filters packs as is the case in the American patent US 3 781 407.
It has been found that such a configuration achieves an optimal contact, and therefore an optimal emission transfer or absorption, between the exhaust gas and the liquid. The configuration wherein cooling and washing take place in one operation also provides the advantage of a relatively simple but particularly (energy-) efficient solution.
Atomizing of the liquid results in optimal contact between liquid and gas, and in an exceptionally high efficiency.
Such an atomizer can preferably be configured here to generate a mist distributed uniformly over the cross-section of the hollow throughfeed body. An arrangement found suitable for this purpose is an arrangement wherein atomizers are disposed at or in the vicinity of the periphery of the throughfeed body and arrange the liquid in the throughfeed body with at least a directional component oriented toward a centre of the cross-section of the throughfeed body and/or toward each other. A desirable droplet size lies between 1 and 2 mm, and in particular between 1.3 and 1.7 mm. Smaller droplets evaporate relatively quickly while larger droplets will on the contrary drop through the exhaust gases again.
The atomizers can particularly be disposed so that no or at least a minimum of liquid is sprayed directly against a wall of the throughfeed body, but precisely such that a greater part of the liquid is mixed via the interior of the hollow body and thus with the flow of exhaust gas. For a good distribution use can be made of a plurality of rings or polygons in which nozzles are disposed.
In a further embodiment of the present invention the distributor comprises a plurality of passage openings for the gas between which a device is placed for capturing and guiding descended atomized liquid to the liquid discharge.
The use of a plurality of passage openings for the gas contributes toward a uniform distribution of the gas over the cross-sectional surface of the throughfeed body, and thereby toward an improved interaction between liquid mist and exhaust gas, thereby increasing the efficiency of the atomizer. In yet another embodiment the passage openings are formed by hollow protrusions which extend from a device which takes a substantially plate-like form and which is placed for the purpose of capturing and guiding descended atomized liquid to the liquid discharge.
The invention also relates to a system for collecting at least a part of the emission from an exhaust gas, comprising a scrubber according to any of the foregoing claims, wherein the gas feed is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein the liquid feed and liquid discharge are incorporated in a closed circuit formed by a process water tank from which water is supplied to the liquid feed and to which water from the liquid discharge is fed back.
A closed system has the advantage that uncontrolled discharge of emission absorbed from the exhaust gases into the sea water is prevented. Contamination of the system, which can occur when direct use is made of seawater, can also be prevented. The system has for this purpose the particular option of recovering water from the flue gases. In an embodiment the liquid in the system according to the present invention is seawater, and the amount thereof can be replenished when for instance too large a part has disappeared through evaporation.
Tn a preferred embodiment the closed circuit also comprises a cooler. By preventing the temperature of the mist from rising as a result of repeated contact with exhaust gas the absorption capacity of the liquid can be optimized for emission from the exhaust gas. Cooling can for instance take place by means of heat exchange with seawater.
In yet another embodiment the process water tank comprises a control system for influencing the acidity of the process water. One influencing option is formed here by the addition of NaOH to the process water. For the purpose of measuring the acidity of the water, a sensor for measuring the acidity can be provided. A sensor for measuring electrical conductivity can also be provided, this conductivity being indicative of the amount of water to be added.
In yet another embodiment the system comprises a water treatment installation for treating water discharged from the process water tank. Such an installation conditions waste process water such that a part thereof can be fed back to the seawater and another part, which may for instance comprise a residue, can be separately processed.
For this latter purpose the water treatment installation can be provided with a sludge tank for collecting sludge separated from water discharged from the process water tank.
An alternative system according to the present invention comprises a scrubber as described above, wherein the gas feed is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein the liquid feed and liquid discharge are incorporated in an open circuit, wherein seawater is supplied to the liquid feed and wherein water from the liquid discharge is optionally fed back via a tank to the sea.
Each of the systems can also be equipped with a gas analyser for analysing gases discharged by the gas discharge, and/or a water analyser for analysing water discharged by a water discharge to the sea.
The invention will now be further elucidated with reference to the following figures. Herein:
- Figure 1 shows a schematic representation of a first system according to the
present invention for collecting at least a part of the emission from an exhaust gas; - Figure 2 shows a schematic representation of a second system according to the present invention for collecting at least a part of the emission from an exhaust gas; and
- Figure 3 shows a detail of the gas feed and water collector of a scrubber according to the present invention.
Figure 1 shows a system 1 for collecting at least a part of the emission from an exhaust gas, comprising a scrubber 2, wherein a gas feed 3 is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein liquid feed 4 and liquid discharge 5 are incorporated in a closed circuit formed by a process water tank 6 from which water is supplied to liquid feed 4 and to which water from liquid discharge 5 is fed back.
The liquid in the system according to the present invention is seawater 8 and the amount thereof can be replenished 9 when too large a part has disappeared, for instance through evaporation. The closed circuit also comprises a cooler 10 which is received between process water tank 6 and water feed 4. By preventing the temperature of the mist from increasing as a result of repeated contact with exhaust gas, the absorption capacity of the liquid for emission from the exhaust gas can be optimized. Cooling can for instance take place by means of heat exchange 11 with seawater 8. The device can also be provided with a device 21 for measuring the conductivity of the process water, from which the acidity can for instance be derived.
Process water tank 6 also comprises a control system for influencing the acidity of the process water. One influencing option is formed here by the addition of NaOH 12 to the process water.
The system also comprises a water treatment installation 13 for treating water discharged from process water tank 6. Such an installation conditions waste process water such that a part thereof can be fed back to the seawater 8 and another part, which may for instance comprise a residue, can be processed separately.
For this latter purpose the water treatment installation is provided with a sludge tank 14 for collecting sludge separated from water discharged from process water tank 6.
Figure 2 shows an alternative system 15 according to the present invention with a scrubber 16 as described above, wherein gas feed 17 is configured to receive an exhaust gas of a marine engine and wherein liquid feed 18 and liquid discharge 19 are incorporated in an open circuit, wherein seawater 19 is supplied to liquid feed 18 and wherein water from liquid discharge 19 is fed back via a vessel 20 to the sea.
Each of the systems 1, 15 can also be equipped with a gas analyser for analysing gases discharged by the gas discharge and/or a water analyser for analysing water discharged by a water discharge to the sea.
Figure 3 shows the detail of the gas feed and water collector of a scrubber 2 according to the present invention. In the shown example the scrubber comprises a feed 22 for exhaust gas which debouches on the underside of the scrubber and which at its upward directed outer end debouches by means of a curvature into a flange 23, above which is provided a roof 24 sloping at an incline.
Situated above the sloping roof is a distributor 25 with a plurality of passage openings 26 for the gas between which is placed a device for capturing and guiding descended atomized liquid to the liquid discharge 27 located substantially on the underside. Passage openings 26 are formed by hollow protrusions extending from a device 25 which takes a substantially plate-like form and which is placed for the purpose of capturing and guiding descended atomized liquid to the laterally oriented liquid discharge 27.
The above described systems are purely illustrative and in no way limitative of the scope of protection as defined in the following claims.

Claims

Claims
1. Scrubber for collecting at least a part of the emission from an exhaust gas, comprising:
- a hollow throughfeed body extending in vertical direction from its underside to its upper side;
- a liquid feed located on the upper side;
- an atomizer connected to the liquid feed for distributing the supplied liquid over the area of the cross-section of the throughfeed body;
- a gas feed located on the underside;
- a distributor located above the gas feed for distributing the supplied gas over the area of the cross-section of the throughfeed body;
- a liquid discharge located substantially on the underside for discharging descended atomized liquid;
- a gas discharge for discharging exhaust gas from which the emission has been at least partially collected, optionally provided with a droplet collector for reducing the discharge of liquid particles.
2. Scrubber as claimed in claim 1, wherein the atomizer is configured to generate a mist distributed uniformly over the cross-section of the hollow throughfeed body.
3. Scrubber as claimed in claim 1 or 2, wherein the distributor comprises a plurality of passage openings for the gas, between which a device is placed for capturing and guiding descended atomized liquid to the liquid discharge.
4. Scrubber as claimed in claim 3, wherein the passage openings are formed by hollow protrusions which extend from a device which takes a substantially plate-like form and which is placed for the purpose of capturing and guiding descended atomized liquid to the liquid discharge.
5. System for collecting at least a part of the emission from an exhaust gas, comprising a scrubber as claimed in any of the foregoing claims, wherein the gas feed is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein the liquid feed and liquid discharge are incorporated in a closed circuit formed by a process water tank from which water is supplied to the liquid feed and to which water from the liquid discharge is fed back.
6. System as claimed in claim 5, wherein the closed circuit also comprises a cooler received between the process water tank and the water feed.
7. System as claimed in claim 6, wherein the process water tank comprises a control system for influencing the acidity of the process water.
8. System as claimed in claim 7, comprising a water treatment installation for treating water discharged from the process water tank.
9. System as claimed in claim 8, wherein the water treatment installation is provided with a sludge tank for collecting sludge separated from water discharged from the process water tank.
10. System for collecting at least a part of the emission from an exhaust gas, comprising a scrubber as claimed in any of the claims 1-4, wherein the gas feed is configured to receive an exhaust gas, such as the exhaust gas of a marine engine, and wherein the liquid feed and liquid discharge are incorporated in an open circuit, wherein seawater is supplied to the liquid feed and wherein water from the liquid discharge is fed back via a tank to the sea.
11. System as claimed in any of the claims 5-10, comprising a gas analyser for analysing gases discharged by the gas discharge.
12. System as claimed in any of the claims 5-11, comprising a water analyser for analysing water discharged by a water discharge to the sea.
13. Method for collecting at least a part of the emission from an exhaust gas, comprising of:
- guiding an exhaust gas through a closed space with internal obstructions from an entry side to an exit side;
- atomizing a liquid at the exit side of the space; - collecting at or close to the entry side the liquid with contaminants absorbed therein;
- atomizing at least a part of the collected liquid again.
14. Method as claimed in claim 13, comprising of:
- cooling the collected liquid before it is atomized again.
PCT/NL2014/050520 2013-08-07 2014-07-28 Scrubber, system and method for collecting emission from an exhaust gas WO2015020519A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2011279 2013-08-07
NL2011279A NL2011279C2 (en) 2013-08-07 2013-08-07 SCRUBBER, SYSTEM AND METHOD FOR CAPTURING EMISSIONS FROM AN EXHAUST GAS.

Publications (1)

Publication Number Publication Date
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3532595A (en) * 1965-06-02 1970-10-06 Mo Och Domsjoe Ab Method for producing high-grade hot water by means of combustion gases from sulphite or sulphate cellulose processes and apparatus for carrying out the method
US3781407A (en) * 1971-02-24 1973-12-25 Mitsubishi Kakoki K Inert gas system for a tanker
US20120312166A1 (en) * 2009-12-21 2012-12-13 Bayer Intellectual Property Gmbh System and method for purifying ship diesel exhaust gases
EP2574393A1 (en) * 2011-09-30 2013-04-03 Alfa Laval Aalborg A/S Scrubber system and process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3532595A (en) * 1965-06-02 1970-10-06 Mo Och Domsjoe Ab Method for producing high-grade hot water by means of combustion gases from sulphite or sulphate cellulose processes and apparatus for carrying out the method
US3781407A (en) * 1971-02-24 1973-12-25 Mitsubishi Kakoki K Inert gas system for a tanker
US20120312166A1 (en) * 2009-12-21 2012-12-13 Bayer Intellectual Property Gmbh System and method for purifying ship diesel exhaust gases
EP2574393A1 (en) * 2011-09-30 2013-04-03 Alfa Laval Aalborg A/S Scrubber system and process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"INTERMEDIATE BOTTOM FOR SCRUBBER", RESEARCH DISCLOSURE, MASON PUBLICATIONS, HAMPSHIRE, GB, no. 420, April 1999 (1999-04-01), pages 500, XP000888813, ISSN: 0374-4353 *

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