Sistem Pemanfaatan Panas Terbuang Pada Proses Blowdown Di Boiler

Abstract

Abstrack : The boiler blowdown process involves the periodic or continuous removal of water from a boiler to remove accumulated dissolved solids and/or sludges. During the process, water is discharged from the boiler to avoid the negative impacts of dissolved solids or impurities on boiler efficiency and maintenance. However, boiler blowdown wastes energy because the blowdown liquid is at about the same temperature as the steam produced. Any boiler with continuous blowdown exceeding 5% of steam rate is a good candidate for the introduction of blowdown waste heat recovery. Larger energy saving occur with high-pressure boilers. Blowdown waste heat recovery can be recovered with a heat exchanger, a flash tank, or flash tank in combination with a heat exchanger. Lowering the pressure in a flash tank allows a portion of the blowdown to be converted into low pressure steam. This low pressure steam is most typically used in deaerator. The drain water from the flash tank is then routed through a heat exchanger that preheats the boiler’s makeup water.                                                             

Keywords : blowdown, heat recovery, flash tank, flash steam, makeup water