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RDF Power

Refuse derived fuel (RDF) is one of the options to extract energy from the combustible material in the waste. It is basically a method of pre-processing the waste in order to use it as a fuel in boilers. This technology involves various processes to improve physical and chemical properties of municipal

 

solid waste. Basically, RDF systems are used to recover recyclable materials and to separate MSW into combustible and non-combustible fractions. The combustible material is called RDF and can be used in boilers. Typically the volume of waste is reduced by 20 to 30%. RDF has a higher calorific value than that of MSW (more than 3 times of MSW).

Waste sorting includes primary and secondary trommel screens, which mechanically separate the dry fraction from the organic, magnetic and induction-type separators for metal recovery, a glass recovery system and a shredder.

Due to reduction in fuel particle size and reduction in non-combustible material, RDF fuels are more homogeneous and easier to burn than the MSW feedstock. RDF has been successfully burned in a variety of stoker boilers and in bubbling and circulating fluidized bed combustion technology boilers.

Due to the homogeneous nature, it needs less excess air and hence works with better efficiency. Also, handling is easier since non-combustibles are already removed. They produce better quality of ash and ash disposal is easy. Emission characteristics of RDF are superior when compared to that of coal due to less NOx, SOx, CO and CO2. The advantage of the refuse-derived fuel plant type is the relatively higher energy content of the RDF fuel.

The investment cost of RDF based power plants is higher when compared to that of biomass plants. Implementing such projects takes more time than that of biomass power plants. Project developers should pay adequate attention to the preparatory work before implementing these projects. Mass burning, gasification and pyrolysis are also used as other options for power generation from MSW.

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