Abstract
The presented article deals with a side channel turbine, which can be used as a suitable substitute for a pressure reducing valve. Pressure reducing valves are a source of high hydraulic losses. The aim is to replace them by a side channel turbine. With that in mind, hydraulic losses can be replaced by a production of electrical energy at comparable characteristics of the reducing valve and the side channel turbine. The basis for the design is the loss characteristics of the pressure reducing valve. Thereby create a new kind of turbine valve with speed-controlled flow in dependence of the runner revolution. It is technical innovation and new renewable source of energy, which can be in future used in rehabilitation or projecting of pumped-storage power plants. It also increases the power of the power plant.
Highlights
At the pumped-storage power plant Dalešice the water for cooling is taken directly from the penstock, see ‘Figure 2’
Pressure of the water is reduced in pressure reduction valve
Theoretical energy efficiency characteristics η, unit flow Q11, power P11 and torque M11 are plotted in dependence on unit speed n11 in ‘Figure 6’ [2]
Summary
At the pumped-storage power plant Dalešice the water for cooling is taken directly from the penstock, see ‘Figure 2’. The flow is 0.145 m3s-1 and the possibility of regulation of the flow to 0.08 m3s-1 is required Another utilization can be in the water mains, energetics, chemical processes or in the place where the conversion of energy into heat occurs due to throttling. The main disadvantage is low efficiency, which is usually within the range of 20 to 50% These machines find their use due to the fact that reaching specific speed ns < 35 min-1 with classical turbines (Francis’ turbine or multistage pump in turbine mode) at high efficiency is quite problematic. Under these circumstances, a counteracting vortex starts to occur in the channels between the blades of the impeller. Theoretical energy efficiency characteristics η, unit flow Q11, power P11 and torque M11 are plotted in dependence on unit speed n11 in ‘Figure 6’ [2]
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