In an ammonia synthesis process, heat integration is essential as there are hot streams to be cooled and cold streams to be heated. There are three process streams to be heat integrated. The synthesis gas must be cooled from 871.3 oF to 39.2 oF. The recycled gas must be heated up from 39.2 oF to 102.0 oF. The compressed gas must also be heated up from 146.7 oF to 527.0 oF. As a good process engineer you want to make use of the excess heat to generate as much as possible 1500 psia saturated steam. Two temperature levels of saturated NH3 liquid coolant are available. Cooling water is also available. Design the Heat Exchanger Network and identify the appropriate flow rates of steam, coolants and cooling water. Design Basis: (1) 50 degrees F minimum approach temperature for all heat exchangers except those requiring refrigerants (2) 7 degrees F minimum approach temperature for refrigerant heat exchangers (3) The data are shown in the data table. Ignore the pressure drop. (4) HYSYS is recommended to simulate the stream duty and flow rate.

Deliverables: (1) PFD for the heat exchanger network or the snap shot of the simulation (2) Fill the blanks in the data table with questions marks. (3) A table summarizing your heat exchanger designs including duties, inlet and outlet temperatures, log mean temperatures, UA values, etc.

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