The available exhaust waste energy depends on the pressure ratio of the compression unit. Consequently, three scenarios were investigated, P30, P50 and P60, referring respectively to inlet pressures of 30, 40 and 50 bar upstream the compression unit. The adequate turbine type was used for each scenario and a waste heat recovery unit (WHRU) was used to recover energy from the exhaust gas to the heating oil loop. A cold temperature limit of 140 ☌ was set as a technical constraint on the heating oil side to prevent Sulphur condensation in the exhaust gas. The remaining energy required to satisfy the solvent regeneration was provided by an external source. Low temperature waste heat from both processes (NG compression and CO 2 capture) was recovered by a set of heat exchangers and was used to power the ORC. The minimum temperature approach was fixed at 5 ☌ except for the WHRU where due to the restriction on pressure drop a minimum approach of 10 ☌ was chosen.Īn ORC with a simple layout and R600 as a working fluid was used for recovering low grade waste heat. The optimal working conditions of the ORC, i.e. temperature, pressure and heating oil flow rate, corresponding to a maximal net power generation, were identified for each scenario by linking Aspen Hysys to Matlab and using Matlab’s prebuilt optimization abilities. In order to reduce computing time, the heat recovery network was solved separately for maximum outlet temperature versus heating oil flow rate.
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