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Solutions > MSW to RDF
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MSW to RDF is a preprocessing of solid waste to make it suitable for pelletizing. This process reduces the size of RDF to less than 6 mm and increases the calorific value to 3000 KCL. We provide the process design and technical write up for MSW to RDF process.
MSW to RDF is a five step linear process, which are:
- Manual Segregation: First, MSW is dumped on the tipping floor where manual inspection is carried out to remove large debris, tree cutting, and tires etc, which are harmful to the down stream process equipment in the power plant.
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- Mechanized Segregation: Mechanized Segregation of MSW primarily has three stages.
- Screening takes place to separate the fine Sand/Grit (below 5 mm which are abrasive and may cause harm to process equipment). The fine fraction separated which also has organic matter in it, has been found useful as manure.
- A Magnetic Separation Unit removes all ferrous items in the garbage. This fraction is collected and taken out for recycling.
- The heavy non-combustible fractions of MSW like stones, glass etc. are separated by passing developed Pneumatic Classifier in which the light combustibles and dense fractions are separated.
- Grinding: The dried and segregated MSW in the form of Coarse Fluff itself is a fuel ready for firing though with lower calorific output. In order to produce Fuel Pellets, this Coarse Fluff has to be further ground to 20-25 mm particle size to produce Fine Fluff in a special purpose Size Reduction unit called Primary Crushing System.
- Drying: MSW in India has been generally found to have high moisture content up to 55% even during non-rainy days and requires drying to produce the Fuel Fluff or Pellets with reasonable heating value. The moisture level of MSW is brought down to around 15% through multistage drying system. Drying can be done by solar or by hot air drying (MSW fired hot air generation system) or by a combination.
- Densification: The Fine Fluff is then densified in the Special Purpose Densification Unit. Based on the requirement, about 5%-10% binder/additives may be mixed with the feed while densification to produce good quality Fuel Pellets. The pellets coming out of the Densification Unit are cooled, bagged and stored in the pellet storage yard for dispatch.
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