Today, harnessing the power of moving water or fluid to produce electricity from hydraulic energy is dependent on fluid machinery like turbines and motors, which are widely used in South Africa and other parts of the world. Turbines are classified as a subgroup of rotodynamic machines that are used in generating power by way of converting hydraulic energy into mechanical energy. They are classified into impulse turbines and reaction turbines.
The Pelton Wheel, also known as the Pelton Turbine is an impulse turbine that converts the energy contained in water to run through it into mechanical energy, meanwhile It has vanes of elliptical shape that are attached to the periphery of its rotating wheel. These vanes are designed to have two sided outlets that facilitates easy and quick ejection of water jets regularly from their holes.
How Pelton Wheel Turbine Works
The increasing speed of water jets released from the taps hit the bucket at splitters. At the splitters, the jets of water are divided into two equal streams. The streams of water runs along the inner curve of the bucket and leaves in an opposite direction of the incoming jets of water. The increasing speed of water jets that runs the pelton wheel are attained over the expansion of high pressure water from the nozzles to the atmospheric pressure.
In order to achieve maximum energy output from pelton wheels, the impulse received by the blades must be adequate to propel it to rise appropriately. To acquire an efficient electricity production, there is a need to ensure that wheels rotate at a constant speed without holdups and deferment.
Controlling Load Changes on Pelton Wheels
For a resourceful control of the gradual changes in load on pelton wheels, servo controlled spear valves are used in the jets to control the rate of water consumption. In a situation where there is a sudden reduction in the load changes on pelton wheels, the water jets will be deflected using deflector plates that could restrain an amount of water in the jets from hitting the blade, which can ultimately prevent over-speeding of the pelton wheel.
HPE Turbine Control Valve for Optimal Pelton Wheel Performance
Turbine Control Valve
The Turbine Control Valve is a very efficient servo controlled spear valve that is designed to ensure that pelton wheels do not over-speed in an event of load reductions.
The valve ensures that rapid closure followed by a slow shut off on turbine nozzles is sufficiently achieved.
In any event of electrical load loss, the HPE Turbine Control Valve reduces all pressure surges and also prevents the wheels of turbines from over speeding.