EP0049585A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and apparatus for treating, particularly desulphurising, a polluted gas
Assignee: WLTD Ltd
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Filing: 1981-09-23
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Granted: —
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Expires: 2001-09-23
Abstract
Abstract In a process involving contacting a gas with a liquid whereby to cool and/or clean the gas, the liquid is sprayed into the gas by means of a rotary-cup atomiser (9), or other "air-assisted" atomiser in which the spray is produced by impacting a film of the liquid with a high pressure air stream. The atomiser (9) has a low spray angle which is beneficial to ensuring good contact with the gas. The method is particularly applicable to processes where the liquid is an abrasive slurry or solution, as in a process of desulphurising a hot flue gas by spray drying in a tower (6).
Inventors
- 👤 Michael John Ashley
- 👤 John Gordon Wyatt
- 👤 Roy Anthony Greaves
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 05:21
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; B01D47/08; B01D53/00; B01D53/34; B01D53/46; B01D53/48
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
91 words
1, A method of treating a polluted gas with a liquid, wherein the liquid is directed from an extended surface of a spray device (9,109,209) into the polluted gas to cool and/or clean the gas: characterised by the steps of (a) continuously providing a film of the liquid on said surface preparatory to directing the liquid from the surface into the gas; and (b) impacting the liquid when it has left the surface with a gaseous stream thereby to produce a spray of liquid droplets for contacting with the polluted gas.
Claim 2
Dependent Claim
91 words
1, A method of treating a polluted gas with a liquid, wherein the liquid is directed from an extended surface of a spray device (9,109,209) into the polluted gas to cool and/or clean the gas: characterised by the steps of (a) continuously providing a film of the liquid on said surface preparatory to directing the liquid from the surface into the gas; and (b) impacting the liquid when it has left the surface with a gaseous stream thereby to produce a spray of liquid droplets for contacting with the polluted gas.
Claim 3
Dependent Claim
20 words
2, A methed according to claim 1, wherein said surface is provided on the interior of a rotating cup (18).
Claim 4
Independent Claim
114 words
A method of treating a polluted gas with a liquid, wherein the liquid is directed into the polluted gas from an extended surface of a spray device to cool and/or clean the gas: characterised in that the extended surface is provided on the interior of a rotating cup (18) and by the steps of (a) continuously providing a film of the liquid on said surface preparatory to directing the liquid from the surface into the gas; (b) providing a gaseous stream around the cup (18) where the liquid leaves said surface; and (c) impacting the liquid with the gaseous stream thereby to produce a spray of liquid droplets for contacting with the polluted gas.
Claim 5
Independent Claim
114 words
A method of treating a polluted gas with a liquid, wherein the liquid is directed into the polluted gas from an extended surface of a spray device to cool and/or clean the gas: characterised in that the extended surface is provided on the interior of a rotating cup (18) and by the steps of (a) continuously providing a film of the liquid on said surface preparatory to directing the liquid from the surface into the gas; (b) providing a gaseous stream around the cup (18) where the liquid leaves said surface; and (c) impacting the liquid with the gaseous stream thereby to produce a spray of liquid droplets for contacting with the polluted gas.
Claim 6
Dependent Claim
37 words
A method according to claim 2 or claim 3, wherein said gaseous stream is supplied through an annular orifice (22) surrounding the rotating cup (18), adjacent to where the liquid leaves the interior surface of the cup.
Claim 7
Independent Claim
28 words
A method according to any one of claims 2, 3 and 4, wherein the cup (18) is rotated at a speed of up to 5,000 revolutions per minute.
Claim 8
Independent Claim
25 words
A method according to any one of the preseding claims, wherein the liquid is directed into the pelluted gas with a low angle of spray.
Claim 9
Independent Claim
83 words
A method according to any one of the preceding claims, wherein the polluted gas is contacted with the liquid in an upright tall thin tower (106,206); the spray device (109,209) directs the liquid downwardly into the gas in the tower; the polluted gas enters the tower via an inlet (150) which is tangential to a continuous circular duct (152) which extends around the axis of the spray devise; and the gas is directed from the circular duct to flow past the spray device.
Claim 10
Independent Claim
60 words
A method according to any one of the preceding clamis when used in desulphurising a hot sulphur dioxide containing gas, wherein the liquid is an aqueous solution or slurry which absorbs sulphur dioxide with chemical reaction, and the conditions in the gas are such that the reaction product is dried as it is formed, and all the water is evaporated.
Claim 11
Independent Claim
60 words
A method according to any one of the preceding clamis when used in desulphurising a hot sulphur dioxide containing gas, wherein the liquid is an aqueous solution or slurry which absorbs sulphur dioxide with chemical reaction, and the conditions in the gas are such that the reaction product is dried as it is formed, and all the water is evaporated.
Claim 12
Independent Claim
30 words
A method according to any one of claims 1 to 7 when used in conditioning a polluted gas prior to passage through an electro-precipitator, and wherein the liquid is water.
Claim 13
Independent Claim
26 words
A method according to any one of claims 1 to 7, when used in evaporatively cooling a hot polluted gas, and wherein the liquid is water.
Claim 14
Dependent Claim
242 words
Apparatus adapted for use in desulphurising a hot sulphur dioxide-containing gas comprising: (a) a gas/liquid contacting vessel (6) which comprises an inlet (10) and an outlet (10a) for the gas; (b) means (7,8,9) for supplying to the vessel an aqueous solution or slurry which absorbs sulphur dioxide with chemical reaction; (c) means (5) communicating with the vessel outlet for removing suspended particles from the gas which has been contacted with solution or slurry in the vessel; and (d) means for controlling the conditions in the gas in the vessel such that in operation the reaction product is dried as it is formed and all the water is evaporated; the means for supplying the aqueous solution or slurry comprising a spray device (9) adopted to direct the solution or slurry from an extended surface of the device into the gas in the vessel, characterised in that the spray device comprises (i) a cup (18) which is rotatable about its axis and the interior of which provides the extended surface; (ii) means (36) for supplying the solution or slurry to the interior surface of the cup so that a film of liquid is continuously provided on said surface preparatory to directing the liquid from the surface into the gas; and (iii) means (21b) for supplying an air stream to impact the liquid when it has left the surface thereby to produce a spray of liquid droplets for contacting with the gas in the vessel.
Claim 15
Dependent Claim
242 words
Apparatus adapted for use in desulphurising a hot sulphur dioxide-containing gas comprising: (a) a gas/liquid contacting vessel (6) which comprises an inlet (10) and an outlet (10a) for the gas; (b) means (7,8,9) for supplying to the vessel an aqueous solution or slurry which absorbs sulphur dioxide with chemical reaction; (c) means (5) communicating with the vessel outlet for removing suspended particles from the gas which has been contacted with solution or slurry in the vessel; and (d) means for controlling the conditions in the gas in the vessel such that in operation the reaction product is dried as it is formed and all the water is evaporated; the means for supplying the aqueous solution or slurry comprising a spray device (9) adopted to direct the solution or slurry from an extended surface of the device into the gas in the vessel, characterised in that the spray device comprises (i) a cup (18) which is rotatable about its axis and the interior of which provides the extended surface; (ii) means (36) for supplying the solution or slurry to the interior surface of the cup so that a film of liquid is continuously provided on said surface preparatory to directing the liquid from the surface into the gas; and (iii) means (21b) for supplying an air stream to impact the liquid when it has left the surface thereby to produce a spray of liquid droplets for contacting with the gas in the vessel.
Claim 16
Dependent Claim
72 words
Apparatus according to claim 11, wherein the vessel (6) is an upright tall thin tower; the spray device (109) is arranged to direct the liquid downwardly into the gas in the tower; the gas inlet (150) is tangential to a continuous circular duct (152) which extends around the axis of the spray device, and means (161) is provided to direct the gas from the circular duct to flow past the spray device.
Claim 17
Dependent Claim
205 words
An upright evaporative cooling tower (206) comprising an inlet (210) and an outlet (210a) for a gas to be cooled, and means for supplying water to the tower for contacting with the gas in the tower to cool the gas; the supply means comprising a spray device (209) adapted to direct the water from an extended surface of the device into the gas in the tower, characterised in that the spray device comprises (i) a cup (18) which is rotatable about its axis and the interior of which provides the extended surface; (11) means (36) for supplying the water to the interior surface of the cup so that a film of water is continuously provided on said surface preparatory to directing the water from the surface into the gas; and (iii) means (21b) for supplying an air stream to impact the liquid when it has left the surface thereby to produce a spray of water droplets for contacting with the gas to be cooled; and the gas inlet (150) is tangential to a continuous circular duct (152) which extends around the axis of the spray device, and means (161) is provided to direct the gas from the circular duct to flow past the spray device.
Claim 18
Dependent Claim
205 words
An upright evaporative cooling tower (206) comprising an inlet (210) and an outlet (210a) for a gas to be cooled, and means for supplying water to the tower for contacting with the gas in the tower to cool the gas; the supply means comprising a spray device (209) adapted to direct the water from an extended surface of the device into the gas in the tower, characterised in that the spray device comprises (i) a cup (18) which is rotatable about its axis and the interior of which provides the extended surface; (11) means (36) for supplying the water to the interior surface of the cup so that a film of water is continuously provided on said surface preparatory to directing the water from the surface into the gas; and (iii) means (21b) for supplying an air stream to impact the liquid when it has left the surface thereby to produce a spray of water droplets for contacting with the gas to be cooled; and the gas inlet (150) is tangential to a continuous circular duct (152) which extends around the axis of the spray device, and means (161) is provided to direct the gas from the circular duct to flow past the spray device.
Claim 19
Independent Claim
74 words
An apparatus according to any one of claims 11, 12 and 13, wherein the cup (18) is surrounded by a stationary shroud (23) and an annular orifice (22) is defined between the cup and the shroud adjacent to where the liquid leaves the interior surface of the cup, and the air supply means (21b) is arranged to supply air to the shroud to provide the air stream for said impaction through the annular orifice.
References Cited (Backward Citations)
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