A method and device for non-emission electric energy production, consisting in: generating negative pressure or vacuum inside a pressure vessel in its upper part constituting a vacuum chamber in whose space a turbine rotor is situated; setting a height of a liquid or water column in the lower part of the pressure vessel constituting a liquid or water column below the turbine rotor, wherein the vacuum chamber is directly connected with the liquid or water chamber situated below the vacuum chamber, and a conventional interface between them is determined by the upper surface of the liquid or water column; closing a first closing means and supplying a liquid or water by a means for supplying a liquid or water to the vacuum chamber.

A method and device for non-emission electric energy production, consisting in: generating negative pressure or vacuum inside a pressure vessel in its upper part constituting a vacuum chamber in whose space a turbine rotor is situated; setting a height of a liquid or water column in the lower part of the pressure vessel constituting a liquid or water column below the turbine rotor, wherein the vacuum chamber is directly connected with the liquid or water chamber situated below the vacuum chamber, and a conventional interface between them is determined by the upper surface of the liquid or water column; closing a first closing means and supplying a liquid or water by a means for supplying a liquid or water to the vacuum chamber.

The hydroelectric generator using a conduit turbine is furnished with a driving shaft which penetrates the center of a conduit through which a flow passes to the inside; a conduit support main body which is provided so as to support the driving shaft; a propeller which is fixed to the driving shaft, and rotates by the movement of the flow; an internal gear which rotates together with the driving shaft from between the conduit support main bodies; an external gear which is driven together with a shaft, outside the conduit, as a rotational force is delivered to the internal gear; and an electric generator.

The hydroelectric generator using a conduit turbine is furnished with a driving shaft which penetrates the center of a conduit through which a flow passes to the inside; a conduit support main body which is provided so as to support the driving shaft; a propeller which is fixed to the driving shaft, and rotates by the movement of the flow; an internal gear which rotates together with the driving shaft from between the conduit support main bodies; an external gear which is driven together with a shaft, outside the conduit, as a rotational force is delivered to the internal gear; and an electric generator.

A method for the in-situ reconditioning of a heavy workpiece mounted on the floor. The method comprises assembling a jig mounted on the floor so as to be arranged around the workpiece to be reconditioned, that is also mounted on the floor, the jig supporting a gantry at the two ends of same, on which there is mounted a precision robotic arm carrying at least one machining apparatus. The method also comprises the alignment of the workpiece and the jig using a precision laser alignment tool in order to allow the jig, the gantry and the robotic arm to form a precision machining apparatus. The method also comprises the reconditioning of the workpiece using the precision machining apparatus.

A system for energy storage and electricity generation is described. The system includes an energy storage system providing compressed air and an electricity generation system. The electricity generation system includes an airlift pumping system pneumatically coupled to the energy storage system. The airlift pumping system includes a water collecting tank containing collecting water and a riser tube having a base immersed in the collecting water and configured for injection of the compressed air into the riser tube through the air pipeline to provide air bubbles within the riser tube that produce an upward flow of the collecting water together with the air bubbles. The electricity generation system also includes a hydro-electric power system driven by upward flow of the collecting water together with the air bubbles to produce electricity, and a water heating system for heating the collecting water in the water collecting tank.

Disclosed is a convex type guide plate waterwheel energy increasing device with gradually dense holes. The convex type guide plate waterwheel energy increasing device comprises fixed devices, a main diversion plate and auxiliary diversion plates, wherein an upwards convex arc structure is arranged on the top surface of the main diversion plate, gradually dense first through holes are formed in the main diversion plate from the middle to the two ends, the diameters of the first through holes are gradually increased, the auxiliary diversion plates are connected to the two sides of the main diversion plate, second through holes are formed in the auxiliary diversion plates, fixed devices are fixed to the two sides of the auxiliary diversion plates, and the fixed devices are used for fixing the main diversion plate and the auxiliary diversion plates to the riverbed.

Disclosed is a convex type guide plate waterwheel energy increasing device with gradually dense holes. The convex type guide plate waterwheel energy increasing device comprises fixed devices, a main diversion plate and auxiliary diversion plates, wherein an upwards convex arc structure is arranged on the top surface of the main diversion plate, gradually dense first through holes are formed in the main diversion plate from the middle to the two ends, the diameters of the first through holes are gradually increased, the auxiliary diversion plates are connected to the two sides of the main diversion plate, second through holes are formed in the auxiliary diversion plates, fixed devices are fixed to the two sides of the auxiliary diversion plates, and the fixed devices are used for fixing the main diversion plate and the auxiliary diversion plates to the riverbed.

This document discloses a solution for analysing cavitation in a hydro turbine of a hydroelectric power plant. According to an aspect, a method comprises: measuring, by using at least one motion sensor coupled to a rotor of the hydro turbine, motion of the rotor during operation of the hydro turbine and thereby generating measurement data; acquiring, by at least one processor, the measurement data and one or more operational parameters of the hydro turbine employed during said measuring, the one or more operational parameters indicative of power supply of the hydro turbine; computing, by the at least one processor on the basis of the measurement data and the operational parameters, at least one metric indicative of an effect of the cavitation on the hydro turbine; comparing, by the at least one processor, the at least one metric with at least one threshold and determining, on the basis of the comparison, that the effect of the cavitation is too high; and outputting, by the at least one processor on the basis of said determining, information indicating unsuitability of the one or more operational parameters.

An air injection device for a hydraulic turbine includes: a body having a first end and a second end; an air injection passage extending through the body from the second end to the first end; a protrusion disposed at the first end of the body; and one or more air injection holes disposed in the protrusion.