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This paper examines the performance of a novel design of combustor for utilising variable calorific value fuel gases as produced by many biomass gasification processes. An integral ash removal system is incorporated into the combustor to reduce the need for subsequent hot gas or other cleanup systems. The combustor is of cyclonic design with tangential inlets for air, start-up fuel and gasification products. Flame stability for low calorific value gases can be enhanced via the use of ceramic/refractory lined sections if required, with the system operating under lean combustion at all times to minimise NOx. Pressure drop of the cyclonic system is minimised by the use of a tangential outlet, as are combustion instabilities, as large central recirculation zones are avoided and associated instabilities like the precessing vortex core. Ash removal from the system is important to minimise damage to turbine components. Two regions are used for particle removal. The first is the base of the unit of a conventional hopper design, and the other, a unique vortex collector pocket (VCP) carefully positioned by the tangential off-take to take advantage of the accelerating tangential flow into the off-take. This paper focuses on the use of CFD to optimise the combustion performance of the combustor run under different operating conditions as well as the removal of coarse and fine material from the flow.

Gas Turbine Combustor With Integrated Ash Removal for Fine Particulates