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Energy Balances and Numerical Methods Design Project Ammonia Production Your assignment is to continue to evaluate the feasibility of a process to produce 50 000 tonne y of ammonia from syngas A suggested process flow diagram PFD is shown in Figure 1 You should use this as a starting point Your assignment is to develop a best case where best is dependent upon economic considerations i e EAOC In reporting your best case clearly indicate any modifications to the PFD and state the operating conditions for the modified process and the corresponding EAOC Chemical Reaction Syngas is available from a pipeline at 1000 kPa and 200 C It is compressed mixed with a recycle stream 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 and the stream partially condensed producing an ammonia rich stream The ammonia liquid product is in Stream 8 Some of Stream 9 is recycled and some is purged Depending on the pressure of the flash separator V 601 the recycle stream may need to be compressed up the pressure of Stream 2 The reaction that occurs in the reactor is reversible N 2 3H 2 2 NH 3 1 This is an equilibrium reaction and the equilibrium constant over a wide range of temperatures is given by 11 806 K 3 29 10 12 exp T In the reactor 90 of the equilibrium conversion is obtained 2 2 3 Process Details Streams and Equipment Details Stream 1 syngas at 200 C and 1000 kPa contains 72 mol H2 24 mol N2 and 4 mol CH4 Stream 8 ammonia product 50 000 tonne y a year is 8000 hours Stream 10 purge used as fuel gas to furnace may take credit for lower heating value Streams 9 11 unreacted syngas and ammonia not in the product stream are recycled the recycle split is a potential decision variable Equipment Information Compressor C 201 The compressor increases the pressure of the feed stream to the pressure of the reactor The compressor may be assumed to be adiabatic In that case the compressor power

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