Kombiniertes Wärmeaustauschsystem für Reaktionsströme der Ammoniaksynthese.

摘要

A combined heat exchanger particularly suited for ammonia converter reactor effluent is described. The combined exchanger (10) includes a first exchanger (20) and a high temperature heat sink (50), such as a steam superheater, within a single exchanger shell (22). In a preferred embodiment, gas leaving the ammonia converter is conveyed into a single pass tube bundle (30) which comprises the feed-effluent exchanger section and then passes through a tubesheet (36) which separates the feed effluent exchanger section (20) from the steam superheater section (50), passing over a U-tube bundle (54) which comprises the steam superheater section in the other part of the shell. Means (70) are provided for protecting the shell (22) in the steam superheater section adjacent the tubesheet (36).