ABSTRACT
This chapter deals with the pre-treatment required by the natural gas stream used to produce ammonia syngas. The pressure of the natural gas stream has to be raised prior to entry into the ammonia syngas production. The basic thermodynamic equations required are laid out for fixing a two-stage compression and calculating the outlet temperatures. From the compression stages, the natural gas stream enters the feed preheater. An energy balance fixes the energy amount required for the stream to reach the specified temperature. The energy balance can also be used to calculate the outlet temperature, and this is demonstrated. The energy for the preheat is supplied from a flue gas generated elsewhere, and the enthalpy of this stream is separately calculated. The preheated gas is now desulphurised by adsorption on a zinc oxide bed. A simple calculation demonstrates the amount of oxide that might be required.
