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SRF/RDF Manufacturing
System Solutions SRF/RDF Manufacturing

RDF Processing Plant

Alternative energy production from solid waste.

Applications

From Solid Waste to Alternative Energy

Waste plastic
Compisite materials (clothes, texitle and fabric)
Mixed packaging
Paper & cardboard
Mixed municipal waste from household or commercial
Bulky waste

Specs

Hourly output: 100-15000kg

Power consumption: 1000kWh

Caloric value: 20kJ/kg (grains) or 20GJ/kg (briquettes)

Output size: 50-100mm

Output type: RDF grains or briquettes

SRF/RDF Manufacturing

SRF/RDF Manufacturing plant is a facility that produces alternative fuel from digesting various waste. RDF is a cost-effective and high caloric fuel. Due to these advantages, RDF often places fossil fuel as a better energy source for paper plant, pulp mill and cement producer. The incineration of RDF can reach 1700 degree celcius. Although converting solid waste to fuel is the goal of RDF production, RDF quality is often impacted by manufacturing input materials and processes.

Input Materials

Composition of waste, water content, ash content, chlorine/sulphur content determine the quality of materials. In some countries, only certain types of waste can go to a SRF/RDF Manufacturing plant. For example, hazardous waste like medical waste is legally not accetable. Preferably, the waste with high caloric conent that is already presorted out recycbles is an ideal ingredient for SRF/RDF. Acceptabe materials include waste or rejected fabric, textiles, leather, clothes; production waste and industrial waste; waste paper and cardboard; scrap plastics like PET bottles, films and post-consumer plastics.

Process

The complexity of incoming materials and the level of desired SRF quality determine the process. A mixed of incoming materials requires a removal of metals, glass and hazardous waste. Respectively, metal separation, trommel and chemical treatment are the solution.

The RDF quality can increase if sorting, separating and shredding are done well. In the last step, a briquetting machine can densify the RDF flakes. Chemical treatment neutralizes hazardous waste.

In short, a SRF/RDF Manufacturing plant can recycle and recover waste by turing waste to energy.

SRF/RDF Manufacturing

Benefits of Using RDF/SRF?

Comparing to charcoal, petrolum and natural gas, RDF in premium/medium/low grade has a undefeatable price advantage.

Secondly, as mentioned several times, RDF contain a high carloric values:

  • 1.7 kg of RDF corresponds to 1 cubic meter of gas.
  • 1.4kg of RDF corresponds to 1 kg of charcoal.
  • 1.7kg of RDF corresponds to 1kg oil sands.
  • 1kg of RDF corresponds to 0.5 petrolum.

This makes RDF a prevalent secondary fuel in the production of cement and paper as well as power plant.

RDF versus SRF

What is difference between RDF and SRF? Let’s start with the abbreviation.

SRF: Solid Refuse Fuel.

RDF: Refuse Derived Fuel.

RDF is a fuel obtained from municipal solid waste (MSW), industrial waste or commercial waste.

SRF is a sub-catagory of RDF, and is a fuel with a higher quality, This is because the waste is usually presorted, thus contains a higher calories.

SRF/RDF Manufacturing Process

The RDF production process is various based on the compostion of the infeed materials. The following are the major steps of a RDF Processing Machine producing RDF alternative energy.

1. Sorting
2. Coarse Shredding
3. Vibrating Screen
4. Magnetic Separation (including eddy-current separator)
5. Air Classifier
6. Fine Shredding
7. Briquetting

SRF/RDF Manufacturing is a waste treatment process. Specifically, a mechanical waste process consists of at least two or even three shredding steps. It process low, medium and high quality of RDF.

The RDF Processing Plant comes with dust filtration and air circulation as the RDF production generates excessive odour and dust.

Coarse Shredding (RDF Shredder)

RDF Shredding delivers by a twin shaft shredder or a pre-shredder. They share a similarity: extremely high torque and low speed. The goal of this step is split-opening waste in bags and destroying the exterior of the waste. Most of the waste is downsized and disintegrated to 100mm by 100mm (4 inches by 4 inches) at the end of this process.

If the infeed materials contain excessive bags or bales, prior to twin-shaft shredder, a pre-shredder is required for the early treatment in a RDF Processing Plant.

RDF twin shaft shredder

Magnetic Separation

Multiple 2500Gs+ magnetic separators operate throughout the system. Metals are typical by-products and shall be sorted out as early as possible. The absence of metal contaminants will prolong the overall machine service life.

2 overband metal separators are immediately used after coarse shredding (RDF Shredder).

Air Classifier (Air Blade)

Plastic, wood, paper, cardboard, foam and textile that contain high caloric value are usually light weighted. That is why RDF Production Plant needs air classifier to keep away heavy items like concretes and scrap metals, bringing up a high caloric value.

Fine Shredding

The goal is to achieve 50mm by 50mm (2 inches by 2 inches). From 100mm to 50mm, it is essential before briquetting and for final RDF quality. The particles are re-shredded by a high-speed and wide-chamber single shaft shredder (RDF Crusher). Inside the shredder, a rotor up to 3 meter long maximize the shredding area.

The hex screen combined with multiple rotor blades on the rotor ensure homogeneous particle sizes and stable capacity. The front doors are easy to access for removal of tramp materials.

Fine shredder

In some cases where the infeed materials are homogeneous and not challenging, a P/T/M series shredder with a hydraulic pusher is sufficient produce RDF.

Briquetting

In RDF Processing Plant, the briquetting machine convert of RDF into uniformly shaped briquettes that is easy to use, transport and store. Mostly important, the RDF cudes are densified and thus increases caloric value/volume.

Before and After

Before delivering a SRF/RDF Manufacturing system, Wiscon tests it with municipal solid waste (MSW) and commercial and industrial (C&I) waste to show the actual capability and RDF quality. As a RDF treatment supplier, we’re dedicated to give a second life to solid waste, recovering as much as alternative energy as possible.

RDF Production Before Briquetting

After Fine Shredding (by RDF Single Shaft Shredder)

RDF Briquettes dia. 50mm

RDF Briquettes dia. 60mm

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