Energy recycling for distillation tower condenser by use exergy analyze

In this paper, energy recycling for distillation tower condenser was done by use exergy analyze of heat integration method. At first, we calculated the amount of condensation energy, in air cooler and then we calculated energy consumption in this equipment based on annual balance. Then, based on heat integration (energy unification), two conditions were proposed to use the current energies in the process for supplying condensation energy first, its must be lesser than condensing temperature of condenser (45° C) (the major condition). Second, it must have much more flow rate than the overhead flow. According to two above conditions, the food flow as chosen as the integration factor and its amount of energy is calculated from the Enthalpy equation as9863964 kj/h. As EFeed >>> QAir Cooler and food flow temperature to condense overhead vapor is satisfying, the food flow can be used to condense saturated vapor to 45 ° C. in case of using food energy and using heat exchanger instead of air cooler, 5480 GJ energy will be saved annually. By using heat exchanger and omitting air cooler, the unit109 operating costs will be reduced considerably. Economically, conducting such project will demand investing costs. But, obtainable incomes from doing this project (electricity consumption recycling and costs reduction) reveal this fact that capital return rate and the project benefits for unit109 of South Pars phases7,8are beneficial.

Keywords:

energy consumption , Distillation Tower , Simulation , optimization