Abstract:
The invention relates to a turbo-machine, in particular to a gas turbine and to a method for accelerating a temperature modification of a rotor shaft rotationally mounted in said turbo-machine. The aim of said invention is to develop a device and a method for the turbo-machine making it possible to reduce the size of a radial split of the turbo-machine in order to obtain greater degree of efficiency. The inventive turbo-machine comprises a rotor rotationally mounted in the case of the turbo-machine, a feeding channel embodied in the rotor for introducing a fluid and an outlet channel embodied in the rotor for removing said fluid. An inlet orifice of the feeding channel is disposed further inside than the outlet orifice of the outlet channel, and an actuating device dependent on centrifugal force is provided.
Abstract:
A system and a method of augmenting the heat up of a unit using a compressed, heated gas that contains moisture such as steam or vaporized water such that the specific heat of the gas is increased. In a preferred embodiment, steam in compressed inert gas such as nitrogen is capable of augmenting the heat up cycle for units such as process reactor vessels, furnaces, process steam and power production boilers, turbines, and other production vessels.
Abstract:
A gas turbine engine component has an annular flange arm, a backing plate mounted to the flange arm and a bypass circuit formed between the flange arm and the backing plate. The bypass circuit includes one or more channels formed in one of the flange arm or the backing plate. When more than one channels are used, at least one connecting slot is provided between the channels. At least one inlet passage extends through the flange arm in fluid communication with the forward-most channel, and at least one outlet slot is formed between the flange arm and the backing plate in fluid communication with the aft-most channel.
Abstract:
A vapor tube structure in a gas turbine comprises first connecting tubes fixed to a casing, second connecting tubes fixed to a blade ring, a recovery ring and a cooling recovery ring, a bellows tube of the flexible structure, springs, a tube and a piston rings provided between the first connecting tubes and the second connecting tubes. As a result, it is possible to absorb and follow the thermal expansion/contraction difference and prevent leaking of vapor.
Abstract:
In a turbine having closed-circuit steam-cooling passages about the rim of the rotor during steady-state operation, compressor discharge air is supplied to the rotor bore for passage radially outwardly into the wheel space cavities between the wheels and spacers. Communicating slots and channels in the spacers and wheels at circumferentially spaced positions enable egress of the compressor discharge air into the hot gas flow path. At turbine startup, cooling air flows through the closed-circuit steam passages to cool the outer rim of the rotor while compressor discharge air pre-warms the wheels and spacers. At steady-state, cooling steam is supplied in the closed-circuit steam-cooling passages and compressor discharge air is supplied through the bore and into the wheel space cavities to cool the rotor.
Abstract:
To control the temperature mismatch between the inner and outer bands and covers forming plenums with the inner and outer bands on sides thereof remote from the hot gas path, passages extend from the leading edge of the covers in communication with the hot gases of combustion to the trailing edge of the covers in communication with the hot gas flowpath. A mixing chamber is provided in each passage in communication with compressor discharge air for mixing the hot gases of combustion and compressor discharge air for flow through the passage, thereby heating the cover and minimizing the temperature differential between the inner and outer bands and their respective covers. The passages are particularly useful adjacent the welded or brazed joints between the covers and inner band portions.
Abstract:
A method and apparatus wherein, during time periods when a turbine is off-line and in a restart-ready condition, residual steam is circulated in the turbine between the cover and base of the turbine such that the cover and base are maintained at generally equal temperatures.
Abstract:
A method of starting a turbine having a shrinkage-fitted rotor provided by shrinkage-fitting discs onto a shaft comprises the steps of raising the temperature of the rotor above a predetermined temperature determined from a physical value of the material constituting the rotor and, thereafter, raising the rotational speed of the turbine from the turning speed to the rated speed, whereby the centrifugal stress on raising the speed acts on the discs in a state wherein the value of fracture toughness of the discs fitted on to the shaft has increased.
Abstract:
A hollow, rotatable shaft bore heater assembly for heating a shaft from its inside to its outside. Rapid rotatable shaft heating is provided by a plurality of electrical heaters situated in slots formed on the inner surfaces of a plurality of foundation members which are insertable in the hollow shaft and are biased thereagainst by biasing structure. When assembled, the foundation members constitute a substantially cylindrical structure which has the slots formed on its inner surface and the electrical heaters are restrained within those axially extending and circumferentially separated slots by insulation disposed on the inner surface of the foundation members across the slots open mouths. The biasing structure provides biasing force between circumferentially adjacent foundation members so as to maintain contact between the shaft and foundation members during non-rotation of the shaft.
Abstract:
An axial flow elastic fluid turbine apparatus includes a rotor having an annular array of circumferentially spaced blades. A casing encircles the rotor and an annular array of circumferentially spaced stationary nozzle blades is fastened the casing and arranged to direct the elastic fluid against the blades of the rotor. An outer covering is disposed over the radially outermost half of at least one blade of the stationary array and a thermal insulating member is disposed between the surface of the blade and the outer covering. Electric heating means are provided for raising the temperature of the outer covering to the Leidenfrost point, i.e., the point at which the temperature of the covering exceeds the vaporization temperature of the elastic fluid corresponding to the prevailing ambient pressure by more than 200.degree. C., to evaporate water droplets which collect on the stationary blade and to prevent the accumulation of relatively smaller water droplets on the stationary blade. By preventing the accumulation of water droplets on the stationary blades, erosion of the rotor blades is avoided.