Method and device for producing sulfuric acid
AssigneesThyssenkrupp Industrial Solutions AG, thyssenkrupp AG
InventorsHolger Thielert, Zion Guetta
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Abstract
In a production mode a process for preparing sulfuric acid may involve oxidizing sulfur to sulfur dioxide in a first oxidation stage, and catalytically oxidizing the sulfur dioxide to sulfur trioxide in a second oxidation stage. The sulfur trioxide may be absorbed in at least one absorption stage. In the production mode, process gases from a last of the at least one absorption stage with respect to a flow direction are discharged. In a standby mode of the process, at least one heating stage for heating the process gases is connected. The process gases exiting from the at least one absorption stage are conveyed to the heating stage, and the process gases are circulated via the heating stage, the second oxidation stage, and the absorption stage.
Claims6
A process for preparing sulfuric acid, wherein in a production mode the process comprises:
- oxidizing sulfur to sulfur dioxide in a first oxidation stage;
- catalytically oxidizing the sulfur dioxide to sulfur trioxide in a second oxidation stage;
- and
- introducing the sulfur trioxide into at least one absorption stage for absorption of the sulfur trioxide, wherein process gases are discharged from the at least one absorption stage in a flow direction,
- wherein in a standby mode the process comprises:
- heating the process gases in a heating stage disposed upstream of the second oxidation stage with respect to the flow direction of the process gases,
- feeding the process gases exiting from the at least one absorption stage to the heating stage and
- recirculating the process gases via the heating stage, the second oxidation stage, and the at least one absorption stage while in the standby mode,
- wherein the process gases are not recirculated while in the production mode.
Dependencies are inferred from the claim text.