Fired heater integration into total site and multiple fired heater targeting

Energy integration of fired heater into the process helps to target minimum fuel and air preheat temperature prior to the detailed design. In this paper a procedure is presented for the integration of fired heater into the total site leading to overall energy saving. The procedure helps to target the fired heater parameters such as, fuel firing and air preheating, for a site integrated directly or indirectly. A procedure for targeting the minimum number of fired heater and the heat duty is also presented for a site with multiple fired heaters. A method is proposed to improve the fired heater efficiency of indirectly integrated site, where steam is the intermediate fluid for transferring heat across the processes.