Redesign combustion air shelter of the furnace to improve the performance in melting bronze for manufacturing gamelan

Keywords: Gamelan, furnace, pollutants, injectors Abstract. Gamelan Bali is a set of Balinese traditional musical instruments used to accompany a series of cultural and religious ceremonies or performances. The existence of gamelan has been famous to foreign countries. Therefore, gamelan is not only produced for national orders but also for international orders. Almost 75% of gamelan production process is done using traditional method, namely: smelting, forging, grinding ( Sruti ) to get the basic tone, and assembly. Smelting process uses traditional furnace, where combustion air is blown from the blower through the injector into the combustion chamber of melting furnace. Open model furnace is used so that the heat generated in the combustion of the fuel is not perfect and it consumes more fuel. This condition, of course, impacts on pollutant factors produced in the combustion process and production cost that is relatively high. To minimize that problem, a change in the combustion air shelters form is done. The use of this method in the smelting process is expected to reduce the production cost, especially in fuel use and to reduce pollutants produced in the combustion process. Studies have shown that the application of the above method reduces the fuel consumption up to 20%. The decrease in the fuel consumption due to the fuel ( charcoal ) is wrapped by more air, thus it makes the fuel combustion process work better.