Supply and installation of grates and grate cleaners

Suministro e instalación de reja y sistema limpiarrejas

Supply and installation of grates and grate cleaners

The design, manufacture, assembly, and commissioning of a hydraulically-driven grate-cleaning system; the system includes a conveyor belt for the removal of waste. Molino de Puente Alba Hydroelectric Plant, La Robla, León.

Molino Badiola, S.L.
August 2016 - November 2016
Type of work:

The new hydroelectric plant at Molino de Puente Alba is located on the Bernesga River, in the municipality of La Robla, León. Its installed power is 2.5 MW, with a design flow rate of 14 m3/s and a gross head of 19.6 meters. Its estimated annual production is 9,400 Mwh/year.

The significant volume of debris carried by the Bernesga River (leaves, trunks, branches, silt, etc...) during periods of maximum flow forced the shut-down of the plant on several occasions during its first months of operation, with consequent major generation losses. 

As a result, a project was undertaken to install a completely new system of grates and automatic grate cleaners at the inlet to the bypass channel built by Coutex. 


Technical data


Grate measuring 8.0 m wide and 4.3 m high, with 100 mm of space between the bars, manufactured entirely of S235 carbon steel.

Grate-cleaning system:

Oil-hydraulic drive system with one lifting cylinder and two approach cylinders. The grate-cleaning system has been designed with a lifting capacity exceeding 5000 kg. 

Conveyor belt:

A belt 600 mm wide and 9.0 m long for removing waste materials collected in the grate-cleaning system.