摘要:
A batch feeding apparatus of biomass to a gasifier is described. A casing is equipped with an inlet of the biomass, also provided in bulk by outside means, and with an outlet of a biomass load towards the gasifier. A transferring element has the function of transferring the biomass from the inlet to the outlet of the casing itself. The transferring element in turn comprises a compartment to temporarily collect a corresponding quantity of biomass. The transferring element is inserted in the casing and is movable with respect to the latter between an initial position, at which the collecting compartment is aligned with the inlet to receive a biomass load, and a final position at which the collecting compartment is aligned with the outlet, to unload the biomass load to the gasifier. A compacting piston is provided for in the collecting compartment.
摘要:
A turbine (1), at least partially centrifugal, for the expansion of a compressible operating fluid, for example gas or steam. At least one group of stages (5), named centrifugal stages, extends in a radial direction with respect to the axis X-X to carry out the centrifugal expansion of the operating fluid. Advantageously, the turbine comprises a group of stages, named centripetal stages (4), extending in a radial direction to carry out a first expansion of the operating fluid centripetally in the radial direction. Moreover, all the arrays of rotor blades are constrained to the shaft (2) at an end thereof, anyway not in the area between the bearings (9), i.e. according to a so-called "cantilevered" configuration and particularly advantageous to carry out maintenance operations. The proposed solution allows high efficiencies to be achieved by a compact turbine. A corresponding method for expanding the operating fluid is further described.
摘要:
A turbine of an organic Ranking cycle ORC is described, the turbine comprising a shaft supported by bearings and a plurality of seals arranged round the shaft for confining the operating fluid expanding in the turbine. The seals define at least four axially consecutive chambers. The operating fluid, with function of barrier fluid, is fed into one of the chambers adjacent to turbine stages; a gas, preferably inert, is fed into one of the chambers adjacent to the bearings, and the corresponding seals are gas seals. This configuration prevents the operating fluid from any kind of contamination by the lubricant used for the bearings, and avoids polluting the environment.