BLOWDOWN HEAT ENERGY RECOVERY OF CIRCULATING FLUIDIZED BED BOILER IN PLTU 60 MW CAPACITY

• Main Author: Meidasari, Memey
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/50621
• Institution: Institut Teknologi Bandung

The feed water in the steam drum generally still contains total dissolved solids and total suspended solids that must be removed during the steam formation process. This is intended to control the level of solids in suspension and dissolved in boiling water process, thus preventing the formation of sludge and scale which can reduce heat transfer and carryover occur. The blowdown water that is disposal still contains thermal energy and has the potential to be reused, so can save fuel operating costs. The blowdown water can be reused using shell and tube heat exchangers with consideration is easy of maintenance. Total savings costs fuel operational for ????????????? = 2-6 kg/s is Rp. 3.219.120.000. The best investment feasibility get of overall heat transfer coefficient (U) = 1,7 kW/m2K with Net Present Value (NPV) is Rp. 11.122.688.000, the value of Payback Period (PP) is 7 months and for the Internal Rate of Return (IRR) is 85.71%. These results indicate that blowdown thermal energy recovery in 2-6 kg/s can save large enough the fuel operating costs and economically feasible to run. The greater blowdown heat energy used, the greater savings fuel operating costs.