Hydraulic fuel feeding silo (HF) - for biomass
We have developed a series of silos with hydraulic feed for fuel in pieces such as bark chips, pellets, briquettes, etc.
The silos are made in two designs, one with fuel feeding at the end for direct feeding onto a grate, and one with the fuel feeding placed in the middle, intended for feeding of a combustion plant provided with air swept spouts.
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Design
The feeder consists of two parts that are built together. At the top is a square silo with increasing cross-section in the downward direction to counteract the risk of formation of bridges in the biomass. At the top, the silo section terminates with a foot grating covered with a thick rubber blanket to prevent the spreading of dust.
At the bottom is a feeder section, which is mounted on a flat plate floor and provided with a number of ladder-like reciprocating units, each moved by hydraulic cylinders.
The individual steps (scrapers) of the ladder are designed with a triangular profile so that movement in one direction will press the material forward in front of the scraper and movement in the opposite direction will press material over and to the front of the scraper.
The HF feeder for direct feeding onto a grate will press the fuel through a duct leading through the boiler front wall to the top of the grate. The plug of material formed in the duct will prevent backfire in the silo. Fuel is only fed when the cylinders are moving in one direction.
Unlike the HF silo, the HFM silo, which is used as a preliminary silo to the regulating screw feed conveyors in a suspension-fired plant, has an outlet in the middle of the silo floor. By turning half of the scraper sections 180°, the material is scraped through the outlet both during the forward and the return movement of the cylinder.
Both feeder types can be manufactured for any desired capacity and volume.
