Reducing the Rate of Riddlings

Riddlings is the fraction of waste passing across a grate bed that drops through the openings in the grate, moves against the primary air stream through the aperture and drops down into the collecting hopper placed under the grate surface.

What is the problem?
The riddlings will accumulate in the hopper and eventually block the primary air. Usually, plants deal with that issue by frequently cleaning the hopper; however it is a very tedious, dirty and manpower-consuming job.

The Dublix Solution
Dublix knows how to revamp your grate mechanics and we can bring further improvement over the design level of the original constructor.
There are 3 focal points for bringing your rate of riddling down to the possible minimum:

• The porosity can be adjusted in various locations of the grate surface to obtain perfect combustion all over the grate;
• The air gap along the grate perimeter can be narrowed down to gaps between 3 and 6 mm;
• The air gap between the grate girders contact flanks can be reduced to somewhere between 2 mm or very close to 0 according to the level of maintenance to be performed.

Achievable results

• The rate of riddling will become minimized;
• The level of uncontrolled ingress of primary air will become minimized along the grate perimeter;
• The risk of under grate fires will become minimized;
• The frequency of hopper cleanings will become minimized;
• Your need of manpower will become minimized;
• The strain on the riddling system will become minimized;
• The mechanical and thermal wear of the grate block contact flanks will be minimized, the grate blocks will get a much longer life;
• Uncontrolled ingress of primary combustion air through big contact line holes brought about by way of thermal wear will become eliminated (blow torch effect);
• You can decide how to distribute the primary air flow across the grate surface;
• Increased waste incinerating capacity due to optimized primary air flow distribution across the grate surface;
• You will be free to change the primary air flow distribution according to significant future changes in the composition of the waste brought to your plant.