RDF Extruding System

rdf-extruder

RDF Extruding System

The material to be treated, pre-shredded, is stockpiled in a storage area. By means of a mechanical shovel, is placed in the hopper.
From there, a conveyor belt feeds a rotating sieve.The underscreen fraction is composed of  hard and abrasive materials (mainly glass and inert), unfit for the RDF production.
The overscreen fraction, mainly consisting of plastics and rubber, is collected by belt conveyors and sent to a temporary storage hoppers.
The flow is then collected by other belt conveyors and sent, after separation of ferrous and non-ferrous metals, to a distribution system feeding the briquetting lines, based on the densifier/agglomerator PROMECO PES – Promeco Extruder System.
Metal fractions (ferrous and nonferrous) are removed by conveying belts to storage container.
The Promeco Extruder System receives the material to be treated in a feeding hopper. From here, two augers feed the material to a vibrating table, which optimizes the flow to the PES extrusion chamber.
In the extrusion chamber the material is subjected to high friction and pressure, generated by the rotating screw mixers, and is then pushed through an extrusion matrix, which determines the shape and size of the product.
The molten profile coming from the matrix is pushed along a stabilization track in a cutting system, which regulates the briquettes according to the specific length and shape desired.
The briquettes are then taken by conveyor belts and sent to a container.

The process generates heat and steam. The latter, along with possible dust, is collected by an exhausted air suction system and, if needed, sent to an air treatment system. The hoods sucking air to treat are located above the extruder feeding system and over  the stabilization track.

The control system is equipped with PLC and inverter for the main engines, that require speed adjustment. The system is controlled by multiple control panels placed close to the different phases.

The plant can operate with 3 employees per shift, and in both automatic and manual mode.

 

Pellets

Thickened

Raw material

MSW inorganic fraction, or other waste/scrap from productive activities

MSW inorganic fraction, or other waste/scrap from productive activities

Max humidity inputs

<15% H20

<30% H20

Hourly production

1500-2000 kg / h depending on the quality of incoming material

5000-6000 kg / h depending on the quality of incoming material

Product

briquettes of variable length, cylindric with a diameter of 32 mm, depending on the matrix and the material used

thickened shape and size vary depending on the material used

Bulk density

900-1200 kg/m³ (depending on the quality of incoming material)

up to 500 kg/m³ (depending on the quality of incoming material)

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