Dedusting takes place in the drum of the classifier, where the input material is broken into smaller parts. The sorting line is used to separate the individual components of the crushed scrap. By repeatedly re-shuffling the scrap in the separation drum, the light fractions (textiles, plastics, etc.) are stripped off by the effect of the circulating air flow.

 

The air is then fed to the cyclone separators where the coarse particles of the light fraction are separated. The coarse particles thus captured are transported out of the circulation circuit by turnstile feeders. The air is sucked from the cyclone outlet by a circulation fan which blows it back into the screening line.

 

Part of the air from the pipe connecting the cyclones and the circulation fan is extracted by the exhaust fan. The air passes through the secondary cleaning stage into the stack, and is discharged into the air. The extracted air is continuously replaced by air from the hall drawn into the sorting line through the inlet and outlet openings for the sorted material.

 

Primary separation

The primary separation is designed as a set of parallel cyclones.  It is a set of four mechanical dust separators.  The cyclones use centrifugal forces acting on dust particles entrained in the extracted air to separate the dust. The incoming air-dust mixture enters the cyclone separator at the top - the eccentric inlet. The impeller causes this mixture to rotate around the axis of the cyclone. The dust particles slide on the inner surface of the cyclone separator tube due to centrifugal force. They are carried downwards towards the discharge flange by gravity. The air leaves at the top of the cyclone separator. For the proper functioning of the cyclone, a pressure separation of the discharge from the surrounding environment is ensured. The separation is achieved by means of rotary feeders. The feeders ensure that the flow inside the cyclone is not affected or air leaks through the discharge throat.

 

Secondary separation

A secondary cleaning stage is installed for the separation of fine particles. This is a set of four pairs of mechanical dust separators. The cyclones for dust separation use centrifugal forces acting on dust particles entrained in the extracted air. The incoming air-dust mixture enters the cyclone separator at the top - an eccentric ramp that sets this mixture into rotation about the cyclone axis. The dust particles, due to centrifugal force, slide on the inner surface of the cyclone separator tube and are carried downwards towards the discharge flange by gravity. The air leaves at the top of the cyclone separator.

 

Each pair represents two cyclone separators in series, with the outlet of the first separator being routed to the inlet of the second separator. The discharge from the cyclone is by means of an expansion tank, which is designed to calm the rotation of the separated material before it enters the rotary feeder. In total, over 100 tonnes of process equipment and steel structures were manufactured and installed.

 

Contract implementation:

• Creation of design, construction and production documentation - G&G filtration CZ s.r.o.
• Production of parts - G&G filtration s.r.o. (SK)
• GreMi Klima is our client and partner.