THE EFFECT OF DECREASING FEED WATER TEMPERATURE ON FLUE GAS TEMPERATURE IN BOILER UNIT 1 AT PLTU

PT Bintan Alumina Indonesia (BAI) is a company engaged in many fields, one of which is the Steam Power Plant (PLTU). PLTU itself is a generator that utilizes the kinetic energy of steam to produce electrical energy. There are various fuels used in PLTU, such as gas, oil, coal, biomass, and others. One of the problems that has occurred at PLTU BAI is the temperature drop that occurs in the main boiler component, namely the feed water. Feed Water itself functions as a place for channeling the working fluid which will be converted into steam. This problem causes an increase in coal consumption as a furnace heating material. Monitoring of the decrease in feed water temperature is carried out using a Distributed Control System (DCS). This study explains the methods used and the research design concerning the effect of lowering the feed water temperature on the flue gas temperature. The results of this study are the temperature difference of 20°C to 30°C, the feed water temperature is lower when compared to the normal temperature. The drop in exhaust gas temperature caused by a decrease in the temperature of the feed water so that the exhaust gas temperature also drops. The impact of fluctuations in the feed water temperature on the parameters is that the flue gas temperature drops, the economizer temperature drops, the steam flowrate decreases, and uses a large amount of coal resulting in a large amount of slag left over from combustion.