Preliminary Investigation Updraft Gasifier with Combustion Zone Gas Outlet and Air Supply using Blowing Blower

Abstract

Several research has investigated and operated different types of gasifiers, with updraft gasifiers being a widely used variant. However, this type of gasifier faces a significant challenge due to the high tar content in the produced gas. The issue arises because tar produced in the pyrolysis zone exits the reactor directly without decomposition, which typically occurs at high temperatures. Therefore, this research aimed to modify the updraft gasifier and conduct initial tests to evaluate the new characteristics. The main modification was carried out by moving the gas outlet from the top to the bottom of the combustion zone. These strategic changes ensured that the pyrolysis gas passed through a high-temperature zone before leaving the gasifier, potentially reducing tar content in the final product. Initial testing of the modified gasifier showed several critical operational characteristics. For instance, the time required for the existing producer to reach operational status was 20 minutes for one bed. The ratio of fuel used to charcoal produced was 0.15, indicating gasifier efficiency in fuel conversion. Additionally, the equivalence ratio was measured at 1.75, while the color of the flame produced was yellow.