Application report "Turbidity to Reduce Abrasion in Hydro Turbines"
Hydropower plants (HPPs) contribute to energy supply from renewable resources. Turbines in HPPs transform the power of flowing water to rotary motion which drives electric generators. The water which flows through HPPs may contain suspended sediment (Pict. 1). Handling these sediments is a major challenge to HPP designers and operators.
Coarse sediment is excluded in gravel and sand traps at water intakes. Finer sediment particles, typically smaller than 0.3 mm, cannot be excluded completely, since the required facilities would be too expensive. These relatively fine particles can still cause significant abrasive erosion on turbine parts. This leads to high maintenance costs and production losses. A main reason for production loss is that the turbine efficiency is reduced if the turbine is eroded.
Most abrasion problems on hydraulic turbines are known from HPPs in the Himalayas, the South-American Andes and the European Alps.
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The FireGuard detects emerging fires already at their early stages (cold smoke). The sensor uses the available natural air stream in the tunnel. Any influence caused by fog will be eliminated by optional heating elements. The sensor is very compact and has neither movable parts nor wear parts nor does it need consumables. As a light source, an economical LED is used. An adjustable bracket allows mounting at the wall, in the arched section or at the ceiling. Special models for installation in the intermediate ceiling or directly in the ventilation dampers are available. Various ways of connections allow a flexible system integration. Individual setting of parameters allows an optimal object and location related setting of alarms, there are no false alarms.
Maintenance is limited to occasional cleaning and the automatic adjustment with a control rod. Soiling monitoring provides information on the state of the instrument. Maintenance is only necessary when required, from experience only about every 5 years, and the time required per instrument is normally between 15 and 25 minutes at the most.