PERFORMANCE OF TWO STAGE COMBUSTORS BURNING NATURAL GAS

Abstract

The current thesis aims to investigate the different parameters affecting the performance of two stage air combustors burning natural gas. The burner consists of two horizontal and concentric pipes which deliver fuel and primary air to the mixing zone. The fuel injected radially inside the primary air stream and then the mixture enters the primary zone combustion at the rich mixture condition. First of all, in the start stage of combustion, products of primary zone are mixed with a secondary air injected from fifteen holes distributed around the primary combustion zone to complete the combustion process. The aim of this process is to produce flames with low emissions. During the experiments, the maximum flow rates of fuel and air was adjusted to have control on the flame stability and extinction limits, The burner was tested to specify suitable mixing zone length. The measurements were carried out at various loads using seven primary air ratios at maximum fuel flow rate and total excess air.