No abstract

According to the Geological Agency (2015), Indonesia's resources total are 106.845 billion tons and coal reserves are 32.263 billion tons. Behind the reasons for choosing coal as an energy source, there are still some disadvantages of using coal directly. One of them is the coal contains a lot of pollutant that are harmful to the environment. Coal releases gases (CO2, N2O, NOx, SOx and Hg) that caused global warming and pollution. The process of solid convert to gas is called Gasification is. In contrast to combustion, the process of is a breaking of the carbon chain into the form of other elements or chemical compounds. In this study, the gasification process was carried out using the downdraft method. Gasification of coal will be produce producer gas in the form of synthetic gas (syngas) with the main components consisting of CO, H2, CO2 and N2 and low in pollutants. This study aims to determine the effect of the type of coal seam on the syngas produced, the calorific value of the syngas, and the effect of the air flow rate.