《Design Project Production of Ammonia》.pdfVIP

Fluid Mechanics, Heat Transfer, Thermodynamics Design Project Production of Ammonia Your assignment is to continue evaluating the details of a process to produce 50,000 tonne/y of ammonia from a syngas feed. This is the amount of ammonia in the product stream, not the total mass of the product stream. A base-case process flow diagram (PFD) is shown in Figure 1. You should use this as a starting point. Your assignment is to complete the mini-designs described later in this document. Chemical Reaction Syngas is available from a pipeline at 1000 kPa and 200°C. It is mixed with a recycle stream, compressed, and heated or cooled to 350°C to be fed to the reactor. The reactor operates adiabatically. The reactor effluent is cooled, the pressure is reduced by a valve, resulting in partial condensation, producing an ammonia-rich liquid stream. The ammonia liquid product is in Stream 10. Some of Stream 11 is recycled and some is purged. The reaction that occurs in the reactor is reversible N H 3 NH +2 (1) 2 2 3 This is an equilibrium reaction, and the equilibrium constant over a wide range of temperatures is given by 11,806 −12 ⎡ ⎤ 3.29 10K ×exp ⎢⎣ T ⎦⎥ (2) The units of K are atm-2. In the reactor, there is a 10°C approach to equilibrium. Process Details Feed Stream and Effluent Streams Stream 1: syngas