Alstom Technology Limited

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Aktiebolaget Svenska Flaktfabriken

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Sune Bengtsson

Kjell Nolin

Lars-Erik Johansson

Mati Maripuu

Fredrik Jens Brogaard

Kerstin Margareta Forsgren

Erik Dahlqvist

Mats Wallin

Erik Simonson

Leif Lindberg

Rikard H Kansson

Lars-Erik Johanson

A wet electrostatic precipitator () includes an inlet () for receiving a gas () containing a pollutant, and an outlet () for discharging therefrom the gas () from which said pollutant has been at least partially removed. Nozzles () are operative for purposes of spraying liquid onto at least one first vertical collecting surface () of at least one collecting electrode (). A liquid distributor () is provided for purposes of pouring liquid onto at least one second vertical collecting surface (), said at least one second vertical collecting surface () being located on a further collecting electrode (), with said further collecting electrode () being located downstream of said at least one collecting electrode (). The nozzles () are located upstream of the liquid distributor (), as viewed with reference to the direction of flow of the gas. In a method of cleaning the collecting electrodes () an upstream electrode () is sprayed with liquid while liquid is poured onto a downstream collecting electrode ().

Wet electrostatic precipitator

A device () for separating sulphur dioxide from a gas () by means of an absorption liquid has an inlet () for gas () containing sulphur dioxide, an outlet () for gas (), from which sulphur dioxide has been separated, and as essentially horizontal apertured plate (), which is arranged to allow passage from below of sulphur dioxide containing gas () and to carry, on its upper side (), a flowing layer () of the absorption liquid. An outlet box () beside the apertured plate () is arranged to be passed by liquid, which is distributed in the gas () coming from the inlet (). A first pumping means is arranged to feed a coolant flow to the outlet box () and a second pumping means is arranged to feed an absorption liquid flow, which is essentially independent of the coolant flow, to the apertured plate () to form the flowing layer (). In a method of separating sulphur dioxide, the above-described device () can be used.

Method and device for separating sulphur dioxide from a gas

A device () for separating sulphur dioxide from a gas has an inlet () for the gas () and an outlet () for gas (), from which sulphur dioxide has been separated. An apertured plate () is arranged between the inlet () and the outlet () and allows the gas () to pass from below. On its upper side (), the apertured plate supports a flowing layer () of absorption liquid. An inlet duct () connects a container () for absorption liquid to the upper side () of the apertured plate (). A means () conveys the absorption liquid () from the container (), through the inlet duct (), to the upper side () of the apertured plate () and along the apertured plate (). The device also has an outlet box () for collecting the absorption liquid () flowing over the apertured plate () and at least one distribution means (), which is arranged to contact the gas () which is supplied to the device () through the inlet () with the liquid () flowing from the outlet box () to the container () before the gas () passes through the apertured plate ().

Method and a device for the separation of sulphur dioxide from a gas

A process and an apparatus in black-liquor evaporation for the selective removal, by liquid absorption, of hydrogen sulphide from the generated gas (,) containing hydrogen sulphide as well as carbon dioxide, an disclosed. In the process, the gas is counter-currently brought into multistage contact, preferably comprising three stages (,), with circulating carbonate-containing alkaline solutions, preferably sodium carbonate solutions (,), the pH of which is adjusted during the absorption to about 9-12 by the addition of a hydroxide, preferably a sodium hydroxide solution (,). It is preferred that the gas flow is turbulent and the liquid flow is laminar when contacted with one another. The apparatus comprises a container (,) having a gas inlet (,), a gas outlet (,), and a packing (,) arranged in several successive stages (,). The apparatus has means (,) for supplying a carbonate-containing solution to the last stage and through this stage countercurrently to the gas, and for recycling the solution across this stage; conduits (,) arranged between the stages for supplying a partial flow of the solution from one stage to a preceding stage; means (,) for supplying a hydroxide to the carbonate-containing solution in at least one of the stages (,); and an outlet conduit (,) from the first stage, as seen in the feed direction of the gas, for discharging a sulphide-containing liquid.

Process and apparatus for absorbing hydrogen sulphide

Method and device for removing sulphur dioxide from a gas

Improved efficiency in recovering SO.sub.2 from waste gases is obtained in a system where the SO.sub.2 is absorbed into a solution which is then distilled. The method of this application entails compressing the steam-SO.sub.2 mixture issuing from the still before condensing out the steam, so that the heat from the compressed steam-SO.sub.2 mixture may be used in generating the steam for the still, and the condensate may be recycled through the still, preferably after reheating the same.

Method for recovering concentrated sulphur dioxide from waste gases

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Vaxjo, Sweden

Sune Bengtsson