POWER November 2016 - 33

PLANT DESIGN
4. Some like it hot. The Amec Foster Wheeler CFB once-through Benson-type boilers at
the Samcheok Green Power Project will operate at ultrasupercritical steam conditions (257 bar,
603C/603C), the first such plant in Korea. Courtesy: Amec Foster Wheeler
The plant will fire principally imported
(mostly Indonesian) coal, as Korea has few
domestic coal sources. Indonesian coal is
a
typical
sub-bituminous
high-moisture
5. Largest in class. The coal-fired Neijiang Baima Power Plant demonstration Unit 5 is
China's first domestically designed 600-MW, supercritical CFB unit and the largest single-unit
CFB plant in the world. Courtesy: Tsinghua University
world (Figure 4). The steam turbine-generator
(1,230 MVA) is the largest ever exported
by Toshiba and the first with 48-inch titanium
last-stage blades.
The plant features a number of advanced
design aspects, such as non-visible coal storage
(in 365-m-long enclosed buildings) that
enables coal to be directly off-loaded from
barges, and a desalination plant fed by ocean
November 2016 | POWER
and reclaimed water sources. Ash is not
stored on site but is directly sent to nearby
abandoned mines. Uniquely, the plant also
includes public observation towers built
above the administration buildings-similar
to the observation deck at this year's POWER
Plant of the Year, Düsseldorf's Lausward
Power Plant Fortuna Unit (see the article in
the August 2016 issue at powermag.com).
www.powermag.com
(ranging from 20% to 42%), low- to medium-ash
(1.5% to 17%) lignite that is much
less expensive on the world market than
hard coals. It also contains low amounts of
sulfur (0.1% to 1.0% in dry fuel), thus eliminating
the need for a flue gas desulfurization
system. The CFBs will also be capable
of cofiring indigenous bituminous coal and
up to 5% biomass. The plant's thermal efficiency
will be ~39% when burning subbituminous
coal.
The overall plant concept includes another
600 MW of renewable generation-including
wind, solar, and small hydropower projects-and
two 450-MW gas-fired combined
cycle power blocks.
A future Phase Two will add another
2,200 MW of CFB power to the site, although
dates for the expansion project have
not been announced. Construction began on
Phase One in 2011. First fire was achieved
on Unit 1 in March 2016, and its 1,100-MW
turbine generator was first synchronized
in May. Also in May, KEPCO announced
that Unit 1 is planned to be commissioned
by December 2016, followed by Unit 2 in
January 2017. The project cost is reported
to be $3 billion.
China. More than half of the world's
CFB boilers, in both number and capacity,
are in China. Among the 300-MW-class
CFB boilers in operation or construction,
22 units are based on licensed Alstom
technology and others are designed with
domestic technologies. The principle manufacturers
of large CFB boilers in China
are Dongfang Boiler Works, Harbin Boiler
Works, and Shanghai Boiler Works. Several
Chinese CFB manufacturers benefitted
by entering into early technology transfer
agreements with Alstom, and Dongfang licensed
Amec Foster Wheeler technology in
1995. By 2010, CFB-based units accounted
for around 15% of China's total coal-fired
power capacity.
In April 2016, Tsinghua University reported
Dongfang Boiler Works had 40 of its
300-MW-class CFB supercritical boilers on
order and eight in operation; Harbin Boiler
Works had 14 on order and none in operation;
and Shanghai Boiler Works had 18 on
order and two in operation.
Chinese firms have leveraged the imported
technology with domestic CFB
research and development (R&D) and
operating and maintenance experience to
develop a new generation of CFB boilers.
Tsinghua University, intimately involved
with the R&D and design of these new, do33

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POWER November 2016

Table of Contents for the Digital Edition of POWER November 2016