ONWARD goes behind the scenes with Marine’s Project Engineer Terry Heng to understand what it takes to design and build…
Powering a Greener and More Sustainable Future
With rapid urbanisation and increased demand for efficient, reliable and sustainable power, ST Engineering is harnessing its marine and environmental engineering expertise to offer advanced technologies for greener power generation.
The need for efficient, reliable and sustainable supply of energy has never been more important. According to The World Bank, by 2045, the world’s urban population will increase by 1.5 times to six billion. Energy demand will increase as the urban population increases and how cities plan to meet this accelerated demand for energy will play a big part in slowing climate change and building climate resilience.
ST Engineering has set its sights on providing environmental engineering solutions for a more sustainable future since the 2000s. Business had begun with the provision of services and solutions for water, wastewater and solid waste management, with the view to undertaking more complex and large-scale projects that could capitalise on its strengths and track records in engineering design and project management.
In 2018, the contract to co-develop the Estrella Del Mar III, a 145 MW Floating Power Plant (FPP), would mark a new turning point, broadening the Group’s ability to tailor sustainability offerings for users both on land and at sea.
300MW Combined Cycle Floating Power Plant Design
A floating power plant is an area of innovation that can help to strengthen climate resilience, enabling coastal cities to cope with rising sea levels while providing a source of reliable energy supply. Following on the heels of the completion and delivery of the Estrella Del Mar III in April 2021, ST Engineering has launched its 300 MW Combined Cycle Floating Power Plant (FPP) design, a recent example of its sustainable energy innovations. Unlike its 145 MW predecessor, the 300 MW FPP is powered by four gas turbines (GTs). It also comes with a heat recovery steam generator (HRSG) that uses heat recovered from the GT’s exhaust to generate steam for driving the steam turbine (ST).
The GTs can burn on natural gas or diesel fuel, which makes this FPP design a more versatile choice for users. With four GTs in place, users have the flexibility to control the amount of electricity generation depending on demand from the grid. Downtime is also minimised given the built-in redundancy made possible through the four GTs.
The additional payoffs of operating a FPP are its portability and small footprint. Typically, FPPs only require about half the footprint of a land-based facility primarily due to their underdeck arrangements. While the GTs, ST and HRSG with their associated control station are housed on the main deck, the electrical components (including the medium- and low-voltage transformers and switchgears) and the cooling system (comprising the main and auxiliary cooling pumps) can be located underdeck. This provides ample weather protection to the supporting equipment, and a more optimal layout for the cooling of the equipment using sea or river water.
Furthermore, FPPs can be deployed easily from one location to another, and are especially useful and effective for island nations in South East Asia and the Caribbean as these nations have many remote areas and islands that would require power generation in an economic way.
|Principal Dimensions (approx.)||Length x Breadth x Depth (115m x 38m x 7.5m), Air draft from freeboard deck 27.7m, Water draft 3.5m|
|Electrical Power||132kV HV ; 6.6 kV MV ; 690V and 400V LV ; 3ph, 50Hz ST – 150MAV GT – 77MAV each at 300C Emergency generator 1750kVA with redundant switchgear and transformer design|
|Modular System Design||Control rooms for ST, GTs and overall plant itself are containerised and can be easily be configured and be placed on above deck|
Integrated Waste Management Facility
Besides delivering sustainable energy solutions on sea, ST Engineering also develops sustainable land-based energy solutions, helping cities to combust municipal solid waste through an advanced Waste-To-Energy (WTE) technology to produce steam in a boiler that is subsequently used to generate electricity through a steam turbine generator. Beyond the production of electricity, the WTE process also serves to significantly reduce the volume of waste to be disposed in landfills, thereby saving precious land space for other urban developments.
The Tuas Nexus Integrated Waste Management Facility (IWMF) is another reflection of ST Engineering’s contributions towards a more sustainable future. In April 2020, a consortium comprising Keppel Seghers Engineering Singapore Pte Ltd, China Harbour (Singapore) Engineering Company Pte Ltd and ST Engineering was awarded an Engineering, Procurement and Construction (EPC) contract for the development of a WTE facility as part of Singapore’s Integrated Waste Management Facility (IWMF).
The IWMF is co-located with PUB’s Tuas Water Reclamation Plant (TWRP), allowing for better synergies in recovering energy from waste. This includes the utilisation of biogas produced in TWRP to be combusted at IWMF, which would improve the overall plant thermal efficiency thereby boosting electricity generation.
Under Phase 1 of the IWMF, ST Engineering will be designing and delivering the power island with a total capacity of 140MW driven by two steam turbine generators using steam produced from the combustion of municipal solid waste. When completed in 2024, the electricity generated will be more than sufficient to sustain the operations of both IWMF and TWRP, with excess electricity being exported to the grid.
As the urban population continues to increase, the world will face new challenges exacerbated by climate change. ST Engineering’s innovative engineering solutions are well placed to address tough environmental problems – be it helping coastal cities to build climate resilience with FPPs, or land-scarce cities to improve municipal solid waste management and address increasing energy demand with WTE technology.
At the same time, ST Engineering is well positioned to tap on the growing market for sustainable power generation. Supported by our regional track record and proven credentials in Singapore, a land-scarce island nation located in South East Asia, we understand the problems faced by many developing island nations and are able to apply our advanced WTE technologies towards creating a more sustainable future.