Abstract
Biomass tar is an obstacle in biomass gasification. Partial combustion is a potential method for tar elimination. To better study the tar conversion conditions and design reasonable partial combustion reactor, 2D/3D throat models are establish to calculate the tar reduction during partial combustion using numerical method. Different number of nozzles, injection directions and injection velocities were investigated. SIMPLE algorithm was used in this calculation. The results indicated that the best performance of partial combustion was obtained when ER (equivalent ratio) = 0.34. A performance of 3 nozzles, perpendicular injection and 20 m/s injection velocity could reach lowest tar content of 3.09 wt%.
Highlights
Biomass gasification is a potential way for the usage of biomass energy
Partial combustion is a potential method for tar elimination
The results indicated that the best performance of partial combustion was obtained when ER = 0.34
Summary
Biomass gasification is a potential way for the usage of biomass energy. Tar contained in the fuel gas is the main obstacle for the usage of biomass widely. Considering the economy and environment-friendly, Partial oxidative/ (combustion) is a attracting way , for it’s no need for expensive mechanical equipment and can lead to a very high tar reduction. X. Guo et al [3] did research on air-steam gasification of biomass micron fuel (BMF) in a cyclone gasifier. Two-stage downdraft gasifier is a kind of low-tar method for biomass conversion. The design of throat and choice of reaction condition is crucial. There are still very few researches on this area especially on the designing of the throat for partial combustion of biomass tar. This paper gives a detail simulation that will optimize the operation of gasification and the designing of gasifier. 3D model of throat combustion area was established to optimize partial oxidation for tar destruction Model. 3D model of throat combustion area was established to optimize partial oxidation for tar destruction
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