European Gas Turbines Limited

Abb Alstom Power UK Ltd.

Eupopean Gas Turbines Limited

Eric E Royle

A combustion chamber is supported in a gas turbine engine by a mounting having a first attachment assembly secured to a wall of the combustion chamber, and a second attachment assembly secured to a support structure rigidly mounted from an engine housing. The first attachment assembly includes a pair of clamp surfaces pressed by a spring to grip parallelly-spaced inner and outer surfaces of the wall. Radial thermal expansion and contraction of the wall, relative to the first attachment assembly, are accommodated by allowing radial slippage between the clamp surfaces and the gripping surfaces. The second attachment assembly includes a spring which permits the combustion chamber and the mounting to tilt relative to the support structure. By accommodating both differential radial movement and tilting, the thermal stresses in the material forming the combustion chamber are reduced.

Combustor mounting for gas turbine engine

Turbines having rotor blades (3, 5) fixed in dovetail grooves (14) in the rotor periphery have bridge pieces (17) which provide in effect a false floor to the inter-stage recess (8, 11) to close off the machining recess from the fluid path. This invention provides a method of fixing this bridge piece which is simple, positive and avoids loading the rotor disc rims with additional centrifugal force. The dovetail groove (14) for the blade root is continued into a raised portion or the rotor recess periphery. This raised portion is grooved circumferentially (21) and the stem (19) of the `T` section bridge piece fits snugly in the groove. A dovetail section key (23) is inserted through the blade root dovetail groove (14) and into the raised portion of the rotor, passing through a hole in the stem (19) of the bridge piece. The latter is thus positively located and locked in position.

Turbines with platforms between stages

An electric power generating system employing a gas turbine (1) and a steam turbine (5) and a gasifier (9) supplying fuel-gas to the gas turbine (1) and to a steam generating fluidized bed combustor (37), the latter providing steam for the steam turbine (5). An auxiliary steam turbine (21), driving an electric generator (22), is also supplied by the circulating fluidized bed combustor steam generator (37). Since the gasifier (9) cannot be reversibly turned down easily, on a fall in load on the main steam turbine (5), the excess steam generated is diverted to the auxiliary steam generator (21) and the gasifier (9) kept running efficiently.

Gas-turbine and steam-turbine based electric power generation system

A gas valve which has provision for a reverse flow pulse of high pressure gas. The valve includes a reservoir which is loaded with high pressure gas during normal operation which is released into the main flow path by an applied pressure reduction. The valve is fitted to a porous ceramic 'candle' filter between dirty and clean gas zones. The high pressure gas pulse reverses flow through the filter and blows off any aggregated dirt. A shut-off valve is arranged to shut the valve in the event the ceramic filter breaks. The valve is efficient and uses only a metered amount of high pressure gas with little loss of pressure between supply and flushing.

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Wigston, United Kingdom

Eric E Royle