Process and reactor for catalytic oxidation of ammonia
AssigneeCasale SA
InventorsIacopo Cerea, Ermanno Filippi, Luca Redaelli, Pasquale Talarico
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Abstract
A process for the catalytic oxidation of ammonia, comprising: passing an ammonia-containing gas, in the presence of oxygen, over a catalyst contained in a reactor, obtaining a process gas containing nitrogen oxides, and cooling said process gas with a heat exchanger accommodated in the reactor, wherein a portion of said process gas, located in the shell side, bypasses the heat exchanger and forms a hot current which mixes with cooled gas downstream the heat exchanger, and the bypass is regulated on the basis of a target outlet temperature of the mixed process gas.
Claims7
A reactor adapted for catalytic oxidation of ammonia, the reactor comprising:
- a catalyst layer, which is adapted to promote the oxidation of ammonia in a presence of oxygen;
- a heat exchange apparatus that is situated in the reactor downstream the catalyst layer, and is suitable to cool a product gas effluent after passage over said catalyst layer, wherein said heat exchange apparatus has a tube side arranged to be traversed by boiling water and a shell side arranged to be traversed by process gas;
- at least one bypass channel arranged to provide a bypass route which bypasses at least partially said heat exchange apparatus;
- a mixing zone where the product gas effluent from said at least one bypass channel mixes with cooled process gas passed through the heat exchange apparatus to give a mixed gas;
- valve means arranged to control a gas flow rate through said at least one bypass channel;
- and
- a control system which is configured to control said valve means, and therefore the bypass flow rate in the at least one bypass channel, based on a target temperature of the mixed gas.
Dependencies are inferred from the claim text.