PENGARUH KUALITAS BATU BARA TERHADAP EFISIENSI BOILER UNIT UTILITAS BATU BARA PT PETROKIMIA GRESIK MENGGUNAKAN METODE INDIRECT/ HEAT LOSS MENGACU PADA ASME

Abstract

PT Petrokimia Gresik in producing organic and non-organic fertilizers uses several energy sources, one of which is the Coal Utility Unit (UBB) located at PT Petrokimia Gresik's factory III. In the UBB unit, there is a Steam Power Plant (PLTU) with a power generation capacity of up to 32 MW (Net 25 MW). One of the main pieces of equipment in a PLTU is a boiler which is used to convert water into pressurized steam by means of heating from burning fuel in the combustion chamber. The fuel used in the UBB unit is coal. To meet the needs for electricity and steam at PT Petrokimia Gresik, boiler performance is paid close attention to both in terms of fuel and operating parameters so that it remains efficient, using the ASME PTC 4 reference. This study analyzes the quality of coal in the form of HHV values on boiler efficiency in units UBB PT Petrokimia Gresik using the heat loss/indirect method, the purpose of this study is to determine the effect of coal quality in the form of HHV values on boiler efficiency. The coal used has HHV values of 4,995 kcal/kg, 4,993 kcal/kg, and 4,986 kcal/kg. From the boiler efficiency calculations referring to ASME PTC 4 with operational data, boiler specifications, and coal content data, the results show that the calorific value of coal affects boiler efficiency. The highest boiler efficiency results were 87.03% at HHV 4,995 kcal/kg and the smallest efficiency was 85.62% at HHV 4,993 kcal/kg, with the biggest heat loss factor affecting coal efficiency due to dry flue gas, moisture from burning H2, and moisture from the fuel.

 Keywords: PLTU, boiler, coal, efficiency, heat loss.