Ammonia plant

摘要

A synthesis plant (309A) includes a compression device (360A) that increases a pressure differential between the bottom product pressure of a cryogenic separator (340A) and the delivery pressure of the bottom product to a downstream plant component. Such increased pressure differential is employed to increase cooling in the separator (340A) to thereby significantly reduce the volume of excess air. In most preferred aspects, at least part of the energy required for the compression device is provided by expansion (320A) of the separator feed.

主权项

1. An ammonia plant comprising:
a raw syngas expander that is configured to receive and expand a raw syngas; a cryogenic rectifier that is configured to receive the expanded raw syngas and to produce a bottom product at a bottom product pressure and to further produce a processed syngas overhead product; an expansion device that is fluidly coupled to the cryogenic rectifier and that is configured to receive the bottom product at a first pressure and to expand the bottom product from the first pressure to a second pressure to thereby provide refrigeration cold to an overhead condenser of the cryogenic rectifier; and (a) a compressor downstream of the expansion device and fluidly coupled to the expansion device to receive expanded bottom product when the first pressure is the bottom product pressure, such that the bottom product of the cryogenic rectifier flows directly from the rectifier to the expansion device and directly from the expansion device to the compressor that compresses the expanded bottom product from the second pressure to a higher pressure, or (b) a pump upstream of the expansion device and fluidly coupled to the expansion device to receive the bottom product when the pump compresses the bottom product from the bottom product pressure to the first pressure, such that the bottom product of the cryogenic rectifier flows directly from the rectifier to the pump and directly from the pump to the expansion device; and wherein the pump or compressor is operationally coupled to the raw syngas expander such that energy expended in the pump or compressor is produced by the raw syngas expander, and wherein a pressure differential between the first and second pressure is sufficient to increase the refrigeration cold in the overhead condenser.