RDF fuel feeding line for сement plant kilns

The technology for supplying RDF fuel is quite complex, with each project being unique, and the composition of the line may vary depending on numerous parameters.

Below is an example description and composition of the Wood waste grinding and drying line. The line includes:

• Heat generators with operational storage (2 units);
• Drying drums with operational storage, a system for removing exhaust gases, and a finished product discharge system (2 units);
• Fuel crusher (1 unit);
• Product crusher (1 unit);
• Elevator;
• Fuel silo + dosing of AT (alternative fuel) to the kiln;
• Drying drums (2 units);
• Heat generators (2 units).

The fuel reception and supply line to the dry kiln decarbonizer (capacity up to 20 tons/hour) includes:

• 2pc of  DOC stations;
• Craper conveyor;
• Separation unit;
• Elevator;
• Rotary weigh feeder;
• Shutter system.

The DOC station for receiving alternative fuel (delivered by chip trucks) has a capacity of 1 to 20 tons per hour. An option for "operation from wheels" is possible, where the chip truck serves as operational storage. Two to three DOC stations can be installed on one collection conveyor. Functions of the DOC station:

• Primary dosing of AT;
• Breaking up lumps and homogenizing the material.

The scraper conveyor has a specialized design for interfacing with the DOC station and is fully enclosed. It is designed to collect and transport AT from two DOC stations to the separation unit.

The disc separator is also enclosed and is intended for removing large inclusions from the AT mass, breaking up lumps, and loosening the material.

The rotary weigh feeder consists of a pre-hopper with a loosening (mixing) device, equipped with a dosing rotor with cells and a two-stage weighing system. Its capacity is up to 15 tons per hour.

The RDF fuel supply line for cement plants also includes screw and airlock feeders, as well as shutter valves.

With this configuration, the grinding and drying line achieves the following performance indicators (Raw material: wet wood waste (sawdust, cuttings, logs, slabs, etc.) with moisture content up to 60%):

• Input of raw material: 23 tons/hour;
• Balance:
  • 5 tons/hour to heat generators for producing heat for drying;
  • 18 tons/hour to the drying line;
• Output: microchips less than 3 mm;
• 11 tons/hour with moisture content less than 10%.