Process and apparatus for controlling the temperature of the catalyst beds in ammoniac synthesis plants.

摘要

The process and the corresponding equipment are intended to allow separate control of individual catalyst beds. For this purpose, at least a part quantity of the circulating gas leaving the penultimate catalyst bed is, for control, passed to a steam generator as heat exchanger and/or a by-pass line around this heat exchanger, and a part quantity of cold circulating gas, before heating and feeding to the first catalyst bed, can be fed as quench to the said by-pass line, the equipment being designed as a steam-generating tube-and-shell heat exchanger (8) and having a by-pass pipe (18) passing through the tube bundle (17), mixing with the hot process gas flowing through the by-pass pipe (18) being provided in the region of the header for the cooled process gas.