METHOD FOR REVAMPING A SECONDARY REFORMER

摘要

A method for revamping a secondary reformer (1), the reformer comprising an internal gas riser pipe (8) for routing a process gas from a bottom gas inlet to a combustion chamber (5) located above a catalytic zone (6), distribution means (9) for introduction of an oxidation agent such as process air into said combustion chamber, wherein the original distribution means of the oxidation agent are discontinued, the gas riser pipe is shortened (8′) and the outlet end of the shortened gas riser pipe is arranged to deliver a gas flow directed upwards; a new burner (20) is installed on top of the reactor, said new burner being arranged to deliver an oxidization agent such as process air with a downward flow, thus obtaining a counterflow mixing zone (23) and formation of a diffusion flame above the outlet end of the gas riser pipe.

主权项

1. A method for revamping a secondary reformer wherein said reformer comprises:
a vertical pressure vessel, a bottom inlet for a process gas; a combustion chamber and a catalytic zone, the catalytic zone being located below the combustion chamber; an internal gas riser pipe connected to said bottom inlet of a process gas; distribution means for introduction of an oxidation agent such as process air into said combustion chamber; wherein said gas riser pipe has a gas outlet end which is above the combustion chamber and comprises means arranged to direct the process gas downwards, so that said process gas traverses the combustion chamber and then the catalytic zone flowing from top to bottom, and the method comprises at least the following steps: discontinuing the original distribution means of the oxidation agent, shortening the gas riser pipe so that the gas outlet end of the gas riser pipe is brought to a lower height in the pressure vessel and closer to the catalytic zone, compared to the original gas riser pipe, and the outlet end of the shortened gas riser pipe is arranged to deliver a gas flow directed upwards; and installing a new burner on top of the reactor, said new burner being arranged to deliver an oxidization agent such as process air with a downward flow, in a mixing zone above the gas outlet end of the shortened gas riser pipe.