LARGE NORTH LONDON WASTE FACILITY

Exeon have been chosen as the emissions control partner in the development a very large North London Heat and Power project. This is a new facility which will create low carbon energy from non-recyclable household waste for seven North London boroughs.

The project accommodates a large resource recovery facility which is designed to sort waste ahead of the combustion process to allow optimal combustion. The RRF (resource recovery facility) includes an integrated ventilation and odour control system for ventilation and removal of odours from the extracted air.

Issues

• Requirement for investigation and report into Best Available Technologies (BAT) for odour control.
• Proof of internal ventilation distribution via Computational Fluid Dynamics (CFD)
• Shortage of plant space requiring specialist bespoke design
• Availability of resource for a substantial project, installed within a very tight timeframe

Solutions

Exeon were able to demonstrate a range of key skills and experience that led to them being selected for the project:

• Extensive technical knowledge – Exeon provided technical support right throughout the project, including investigating different odour control technologies and their suitability, and research into the typical and predominant waste streams caused by transfer of municipal waste.
• Experience – Exeon used the team’s wealth of experience in Waste Transfer stations, and their methodologies.
• Airflow distribution investigation – carefully distributing the extract points to ensure they will not clash with moving machinery, but at the same time carrying out CFD modelling to ensure internal airflow distribution to meet the high standards of the Client.
• Flexibility and availability – Exeon worked on the design for many months alongside the architects and consultants, in order to achieve the best available technique and a satisfactory outcome. This included extensive concept tested design on the plant area to ensure that no site shutdown will be required to maintain the plant.
• Speed – Exeon provided the installation package within very tight time constraints.
• Cost – Working with the site team to value engineer the proposal.

Technical

The plant design includes the following:

• Dual systems each with 4 fans including 1 offline
• Total system volume 581,200 m3/hr (290,600 m3/hr per system) giving 4 air changes per hour in the serviced space
• Each system has an offline 2-stage dust lter housing so change can be carried out without plant shutdown or reduced speed
• Automatic dampers throughout the plant to rotate fans
• Setback speeds with inverter-controlled fans
• Annular bed adsorbers with over 180 tons of activated carbon for odour removal
• Stainless steel used throughout for maximum design life
• 40M high twin 3.0m diameter stacks
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