Energy and Exergy Analysis of Steam Power Plant Cycle of the Ninth Refinery of South Pars Gas Complex

In this research, the energy and exergy analysis of steam power-plant of the ninth refinery of South Pars Complex has been studied. Firstly, according to thermodynamic characteristics, pressure, temperature , flow rate and the type of fluid in terms of saturated water, dense liquid and super heat steam, enthalpy and entropy quantities were calculated and then using energy and exergy balance relationships, the losses and efficiency of various equipments have been calculated. The results of energy analysis showed that Boiler with 62.09 MW, Drum 107 with 17.75 MW and Deaerator with 14.17 MW have the highest energy losses and the efficiency of first law is 41%. Also, based on the results of exergy analysis, boiler with 94 MW, Heat exchanger with 5.297 MW and drum 107 with 5.233  have the highest amount of exergy destruction and the efficiency of second law is 33%. Also, the results showed that due to the use of the steam output from the turbine in other operating units in the studied refinery, the condensers have less exergy destruction and energy losses compared to other power-plants. In addition, by using the solution proposed in this research to heat input air of the combustion chamber through hot water coming out of the Continues Blow Down (CBD), it is possible significantly increase the exergy of the input air.