Sulphur dioxide treatment
AssigneeLe Gaz Integral SAS
InventorPeter Frank Cross
Life of this patent
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Abstract
A process for removing sulphur dioxide from the gaseous effluent of a smelter furnace comprising the steps of: providing the gaseous effluent from a smelter; separating the sulphur dioxide from the gaseous effluent to provide concentrated sulphur dioxide and effluent for discharge into the atmosphere; mixing the concentrated sulphur dioxide with a fuel gas; heating the mixture such that the concentrated sulphur dioxide and fuel gas react to form a gaseous product mixture comprising sulphur and hydrogen sulphide; and removing the majority of preferably substantially all of the sulphur and hydrogen sulphide from the gaseous product mixture; wherein the remaining gaseous product mixture is incinerated before being vented into the atmosphere or is recycled into the smelter furnace.
Claims26
A process for removing sulphur dioxide from the gaseous effluent of a smelter furnace comprising the steps of:
- a) providing the gaseous effluent from a smelter;
- b) separating the sulphur dioxide from the gaseous effluent to provide concentrated sulphur dioxide and effluent for discharge into the atmosphere;
- c) mixing the concentrated sulphur dioxide with a fuel gas to form a fuel gas-sulphur dioxide mixture;
- d) heating the fuel gas-sulphur dioxide mixture by combusting fuel gas in the fuel gas-sulphur dioxide mixture with oxygen such that the concentrated sulphur dioxide and fuel gas react to form a gaseous product mixture comprising sulphur and hydrogen sulphide;
- and
- e) removing the majority of the sulphur and hydrogen sulphide from the gaseous product mixture;
- characterised in that the remaining gaseous product mixture is incinerated in an incinerator before being vented into the atmosphere.
A process for removing sulphur dioxide from the gaseous effluent of a smelter furnace comprising the steps of:
- a) providing the gaseous effluent from a smelter;
- b) separating the sulphur dioxide from the gaseous effluent to provide concentrated sulphur dioxide and effluent suitable for discharge into the atmosphere;
- c) mixing the concentrated sulphur dioxide with a fuel gas to form a fuel gas-sulphur dioxide mixture;
- d) heating the fuel gas-sulphur dioxide mixture by combusting fuel gas in the fuel gas-sulphur dioxide mixture with oxygen such that the concentrated sulphur dioxide and fuel gas react to form a gaseous product mixture comprising sulphur and hydrogen sulphide;
- e) removing the majority of the sulphur and hydrogen sulphide from the gaseous product mixture;
- characterised in that the remaining gaseous product mixture is recycled into the smelter furnace.
A smelter comprising:
- a) a smelter furnace having a gaseous effluent outlet,
- b) means for collecting gaseous effluent from the gaseous effluent outlet;
- c) means for removing sulphur dioxide from the gaseous effluent so as to provide concentrated sulphur dioxide and an effluent suitable for discharge into the atmosphere;
- d) means for mixing the concentrated sulphur dioxide with a fuel gas to form a fuel gas-sulphur dioxide mixture;
- e) means for heating the fuel gas-sulphur dioxide mixture by combusting fuel gas in the fuel gas-sulphur dioxide mixture with oxygen such that the concentrated sulphur dioxide and fuel gas react to form a gaseous product mixture comprising sulphur and hydrogen sulphide;
- and
- f) means for removing the sulphur and hydrogen sulphide from the gaseous product mixture;
- characterised in that the smelter comprises means for recycling the remaining gaseous product mixture into the smelter furnace.
A smelter comprising:
- a) a smelter furnace having a gaseous effluent outlet,
- b) means for collecting gaseous effluent from the gaseous effluent outlet;
- c) means for removing sulphur dioxide from the gaseous effluent so as to provide concentrated sulphur dioxide and an effluent suitable for discharge into the atmosphere;
- d) means for mixing the concentrated sulphur dioxide with a fuel gas to form a fuel gas-sulphur dioxide mixture;
- e) means for heating the fuel gas-sulphur dioxide mixture by combusting fuel gas in the fuel gas-sulphur dioxide mixture with oxygen such that the concentrated sulphur dioxide and fuel gas react to form a gaseous product mixture comprising sulphur and hydrogen sulphide;
- and
- f) means for removing the sulphur and hydrogen sulphide from the gaseous product mixture;
- characterised in that the smelter further comprises an incinerator for incinerating the remaining gaseous product mixture.
Dependencies are inferred from the claim text.