The Characteristics of Oxygen-enriched Gasification for Fluff SRF

Abstract

In the gasification process, the composition of the syngas and its heating value are influenced by the oxidization agents. The oxidization agents include air, oxygen, oxygen enriched air or steam. A preliminary study on oxygen-enriched gasification of fluff solid refuse fuel (SRF) was carried out in a bench-scale down-draft fixed bed reactor. The purpose of this study is investigation for the influence of the oxygen concentration in the oxidization agent on the gasification characteristics such as syngas heating value, carbon conversion ratio and cold gas efficiency with a bench-scale fixed bed reactor.Low heating values (LHV) of sample 1 and 2 are 3,821kcal/kg and 4,946kcal/kg, respectively. The down-draft fixed bed reactor consists of nitrogen, oxygen and air inlet zone, reaction zone, gas purification zone and gas analysis zone. An electric heater with variable power is attached to the fixed bed reactor. The fluff SRF is fed inside the reactor. The dust, tar and moisture in the gas are separated by a cyclone, a venturi scrubber and a water separator. The purified gas was analyzed with gas chromatography (Inficon Micro GC 3000) at an interval of 3 minutes.The concentrations of H2 and CO in the syngas for test 3 were 15.51% and 19.00%, respectively. However, in the case of test 4 the concentrations of H2 and CO in the syngas were 26.30% and 23.21%, respectively. Therefore the concentration of combustible gas such as H2, CO and CH4 increased with increasing O2 concentration in the oxidization agent. However syngas cold gas efficiency and carbon conversion ratio was not increased with increasing O2 concentration in the oxidization agent.