Waste Receiving and Processing

MSW Treatment

New Centre Energy have worked closely with their main MSW Treatment ‘supply partners’, Stadler AG, to develop a standarised, reliable and robust MSW treatment plant and facilities to form the upstream plant facilities of the NCE Waste to Energy Plant.

The MSW Treatment facilities can be specifically tailored to the in-country requirement or the waste material types expected to be received.

The priority is to receive the waste materials and offload in a dry area, particularly if during the rainy or monsoon season.

NCE’s MSW Treatment facilities are planned to be operated 6 days per week, as it is expected that MSW would not be delivered on a Friday or Sunday, depending on the plant’s location. Therefore MSW plant cleaning and maintenance would be scheduled for one full day per week when MSW is not delivered to site. However, the incoming MSW can be received 7 days per week if required.

The MSW Treatment plants are operated with two 9 hrshifts per day, with a 6 hours break between shifts, this will be a daily opportunity to undertake cleaning and minor preventative maintenance activities, as operating an MSW plant is a dirty and messy operation.

Typically NCE’s standard MSW Treatment Plants supplied by Stadler have the following equipment:

• MSW Pre-Shredders
• Screening Drums
• Air Separators
• Trommels
• Overband Magnets
• Rotary Driers
• Course and Fine Shredders
• X Ray Sorters
• Transfer Conveyors Systems
• Auger Feed Arrangements

The only items to be recovered from the MSW will be inert items, such as glass, metals, bricks/stones and building material etc. These materials will be manually removed where ever possible, and also via an automated separation system within the MSW plant facilities. These recovered items can be recycled into the local communities for sale and reuse etc. All other items can be processed into RDF material.

It is important that the incoming MSW is largely unpicked, and retains materials of a reasonably high kcal, such as plastics and paper items etc, so local reform programmes and employment opportunities will need to be developed to employ current waste pickers, or to use them to source materials normally picked etc.

The final product from the MSW Treatment facilitieswill be a MSW dried and shredded to a small 10mm particle size Refuse Derived Fuel (RDF) material, and it will be automatically transferred into the RDF Buffer Store area in an adjacent building, via an auger feed conveyor system.

To enable the Operations Team to adjust RDF kcal values during operations to ensure good levels of quality syngas production, a vehicle tyre processing facility will also be installed as standardised equipment, within the MSW treatment building. This will enable tyre crumbs to be blended into the finished RDF material and will boost kcal values if NCE’s Operations team find the locally sourced MSW does not always provide good enough kcal values to match syngas production volume requirements. Tyre kcal values can vary between 7,000 to 10,000 kcals/kg, so blending can be an important addition to the RDF making process to form enriched feed stock materials.

RDF Storage and FEED Transportation System

The RDF Storage facilities are in a building next to the MSW Treatment Area, and have a buffer capability of between 48 and 72 hours, to allow the UHTH feed to still supply the reactors when scheduled cleaning and maintenance activities require the MSW plant to be shutdown.

The RDF Store buildings are installed with a Push/Walking/Moving Floor system that the DRF gets loaded onto.  The moving floor system ensures that all RDF material within the silos gets rotated and used sequentially via a bottom mounted auger feed system, which transfers RDF automatically onto a double chain conveyor feed system to provide the RDF material directly into the UHTH Reactor area and feeds RDF, via automated slide gate valves, into the individual UHTH reactors inlet feed hopper.

 

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