Abstract: A cooling system for use with a gas turbine combustion assembly having a flame tube and a surrounding air delivery sleeve, the system comprising a vessel shaped and dimensioned to surround the air delivery sleeve and adapted for fluid flow there through. A method of cooling a combustion assembly includes the step of directing a flow of fluid over an outer surface of the delivery sleeve.

Abstract: An apparatus for controlling the operation of a gas turbine engine to enable the engine to utilize low calorific value gas, such as low quality landfill gas, said apparatus comprising a gas compressor for compressing gas to be combusted in the combustion chamber of the engine, means for supplying a low calorific value gas to an input of said compressor, and means for mixing a non-combustible gas, such as air, with said low calorific-value gas supplied to the compressor to control the power output of the engine while maintaining a substantially constant flow rate of gas through the compressor.