Flue Gas Desulfurizer mass and energy balance in 300 MW class subcritical Coal-Fired Power Plant for retrofit application

Abstract

Based on the recent implementation of the Ministry of Life and Environment (MOLE) Regulation No. P.15/MENLHK/SETJEN/KUM.1/4/2019 regarding Power Plant Flue Gas Emission, which supersedes MOLE Regulation No. 21 year 2008, there is a reduction of maximum Sulfur Dioxide (SO2) concentration in flue gas emission of Coal-Fired Power Plant (CFPP), from 750 mg/Nm3 @7% O2 content (dry basis), to 550 mg/Nm3 in existing CFPP, and 200 mg/Nm3 in CFPP constructed after the implementation of the regulation. Thus, arises the necessity for the consumption of Coal with lower Sulfur (S) content and/or retrofitting of Flue Gas Desulfurizer System (FGD) system in CFPP, not yet equipped with the FGD system. One of the applicable systems for retrofit is Sea Water FGD (SWFGD). This paper explores the energy and mass balance aspect of the SWFGD system for application in 300 MW subcritical reheated steam CFPP. Operational aspect is the increase of allowable sulfur content in consumed coal up to 1,162%, when the plant is retrofitted with SWFGD, and an increase in condenser cooling water of 0.6 °C due to SWFGD Absorber interface.