Sembcorp Second Co-Generation Plant, Singapore

Sembcorp Second Co-Generation Plant, Singapore

Sembcorp Industries, a Singapore-based energy, water and marine group, is
building an 800MW gas-fired combined cycle co-generation power plant in the
Tembusu sector of Jurong Island in Singapore. The first phase of the project
was completed at a cost of S$635m. The power plant provides electricity and
steam to petrochemical plants on the island.

The new plant is the second co-generation plant being developed by Sembcorp.
It is operated by the company under a power generation licence granted by
the Energy Market Authority (EMA) of Singapore.

The project is part of a capacity expansion programme that is expected to
double Sembcorp's generation capacity to 1,600MW. It is funded by a mix of
bank loans and internal cash resources.

The company owns an 815MW co-generation plant in the Sakra sector of Jurong
Island.

The plant was commissioned in 2001 and billed as Singapore's first
co-generation plant.

Sembcorp plant details

The new 800MW plant will be constructed in two phases of 400MW each.
Construction began in the second quarter of 2011 and the first phase became
operational in October 2014. Phase one generates 400MW of power and 200t/h
of steam.

Each phase features Alstom's GT26 gas turbine, a steam turbine, a turbo
generator and a heat recovery system. The ALSPA Series 6 integrated control
system is installed to regulate the plant's working mechanism.

The new plant uses natural gas and liquefied natural gas (LNG) as fuel.
Natural gas is transported through pipes from Indonesia, while LNG is
supplied by Singapore-based BG Group under a long-term agreement.

Development of the Sembcorp plant

The engineering, procurement and construction contract was signed with
Alstom Power Singapore and Alstom (Switzerland) for a total value of €500m
(S$900m).

The order for the first 400MW was signed in February 2011. The €300m single
contract covers the supply of the entire unit and associated equipment, as
well as an 18-year maintenance clause.

GT26 turbine technology

The GT26 turbine design is based on the sequential combustion technique. It
can perform at a 60% efficiency level in a combined-cycle operation. An
operating range of 40% and below while keeping low NOx levels allows the
plant to meet the necessary power demands.

The flexible GT26 technology can operate on a single and combined cycle.
Features such as a low-inlet temperature, a uniform annular temperature
profile, a welded rotor, and a simple and robust Environmental Vortex burner
help to increase the reliability and availability of the turbine.

The sequential gas turbine provides lower kilowatt hour costs without
reducing availability. The concept exhibits high-power density in a gas
turbine.

GT26 has five rows of small dimensional blades, arranged in the form of
fir-tree slots. A combination of film and convection cooling techniques
cools the high pressure turbine stage and the first three low-pressure
turbine stages through the air coming from the compressor.

Fuel in the turbine is burnt in two dry NOx combustors at low fire
temperatures. These burners are capable of using combination of fuel such as
natural gas, LNG, medium or low-calorific gases or light oil, which
eliminates dependency on a single fuel.

Singapore power market

As per 2015 estimates, Singapore produced 50TWh of electricity, 48TWh of
which were consumed.

Approximately 95% of the electricity generation is fuelled by natural gas.
With the increase in electricity demand there has been a strong uptake of
LNG by power companies in Singapore, resulting in the construction of a
third LNG terminal on Jurong Island, which came online in 2013.

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John Diecker
APT Consulting Group Co., Ltd.

www.aptthailand.com