Design and Build of Waste-to-Energy Stack

Case study

Design and Build of 6th Waste-to-Energy Plant, Singapore

Singapore’s National Environment Agency (NEA) embarked on a visionary project to address the nation’s future waste management needs. To tackle the challenge of limited land availability in Singapore, the 6th Waste-to-Energy (WTE) plant was planned to be the largest, most energy-efficient, and land-efficient facility of its kind situated on a 4.8 hectare site in Singapore’s West. The NEA awarded a consortium comprising Hyflux Ltd and Mitsubishi Heavy Industries, Ltd. as the preferred bidder to construct this remarkable WTE plant.

Challenges

Compact Site: The limited working area of the construction site demanded meticulous planning and efficient resource management.

Flue Liner Installation: The project involved lifting and installing four flue liners into a confined space, necessitating precision and skill.

Entry Duct Installation: The installation of four entry ducts through a single windshield opening was a complex task that required careful execution.

BEC's Approach

BEC designed and constructed a 120-meter-high concrete-reinforced stack with four 2.65-meter internal diameter (ID) liners. The scope of work undertaken by BEC included a variety of critical components:

Slipforming: BEC skillfully handled the slipform construction of the stack, ensuring structural integrity and precision.

Heavy Lifting: The project encompassed the heavy lifting of the stack’s roof, floors, and flues, a task executed with finesse by BEC.

Internal Infrastructure: Installation of a rack-and-pinion hoist and internal lighting to improve functionality.

Safety Components: AWL (aviation warning lights?), lightning conductors, and earthing works were all undertaken with precision.

The BEC Advantage

BEC’s successful project completion was critical in managing the plant’s emissions, promoting environmental safety, and ensuring compliance with regulations. Despite the challenges presented, BEC’s expertise and dedication ensured that the stack met the highest standards of quality and structural integrity.

This Waste-to-Energy Plant symbolises Singapore’s commitment to efficient waste management and sustainability. It generates an impressive daily output of 2,880 megawatt-hours (MWh) of electricity, equivalent to a highly efficient rate of 800 kilowatt-hours (kWh) per ton of waste incinerated.