Effect of Fuel Composition in Bio-syngas on NOx in Emission with SI-ICE 2019-32-0604

In recent years, effective methods of utilizing power generation using biomass have been studied a biomass power generation with an internal combustion engines. It is able to be used even on small scale. In addition, by using the ICE, it is possible to make the efficiency relatively high. The compact downdraft type gasifier was manufactured. It generates bio-syngas from biomass. A small spark ignition ICE (SI-ICE) was drove using bio-syngas as fuel. NO is included in the emission of the ICE. Due to NO is said that it pollute the atmosphere and destroy the ozone layer, it must be reduced. Many researcher study NO in emission with synthetic gas of CH4 mixed with H₂. Their result is NO increased as H₂ ratio increased. However, experiments with actual syngas is few. And, combustible gases in bio-syngas produced by our equipment are CO, H₂ and CH₄. Previous studies with synthetic gas of mixed CO, H₂ and CH₄ is few. Therefore, experiments are performed with actual syngas. Also, H₂ and city gas (13 A) is added to syngas for the purpose of changing the combustible gas composition. Also, thermal efficiency and operational stability were compared. COV-IMEP was used for operation stability. H₂ and 13A were mixed in 2 inch hose. The experiment was conducted with same IMEP and excess air ratio. The experiment result was compared with syngas, syngas added H₂ and syngas added CH₄. It was that NO with bio-syngas was higher than 13A. NO in the emission was thermal NO. The maximum incylinder temperature and the heat release ratio increased when H₂ was added. And initial and main combustion duration decreased. When CH₄ was added, the result was the opposite of when H₂ was increased. It is expected from this experiment that when bio-syngas is used, there will be the combustion duration in which the balance of NO emission and thermal efficiency is best.