POWER September 2021 - 31

RECIPROCATING ENGINES
Wärtsilä Supplies
Engines for Similar
Cambodian Project
In June 2019, CGGC-UN Power Co.
Ltd., a subsidiary of China Gezhouba
Group Co. Ltd. (CGGC), placed an order
for Wärtsilä to supply 12 engines for a
200-MW power plant to be constructed
near Phnom Penh, Cambodia. CGGCUN
Power Co. was part of a consortium
with China Gezhouba Group International
Engineering Co. Ltd. spearheading
construction of the project on
behalf of Cambodia's state-owned utility
Electricité du Cambodge.
utility, Electricité du Cambodge (EDC),
sought to increase flexibility was by
adding a 200-MW power station in
Phnom Penh, the nation's capital. In August
2019, MAN Energy Solutions and
China National Heavy Machinery Corp.
(CHMC) were jointly awarded a contract
to build the facility. CHMC took
responsibility for the engineering, procurement,
and construction, while MAN
was tasked with delivering and commissioning
dual-fuel reciprocating engines
for the new plant.
The Phnom Penh power plant consists
of 11 MAN 18V51/60DF engines
(Figure
1). At full load, the station
can supply enough electrical power
to meet the average energy requirements
of about 70,000 Cambodian
households.
" The new power plant will make a
significant contribution to securing the
power supply in Cambodia, regardless
of weather or climatic conditions, "
Wayne Jones, chief sales officer at
MAN Energy Solutions, said.
2. Twelve Wärtsilä 50DF dual-fuel engines
were delivered to Electricité du Cambodge's
C7 power plant, which is located near Phnom
Penh, Cambodia. Courtesy: Wärtsilä
Wärtsilä's 50DF dual-fuel engine
(Figure 2) was selected for the project.
The 50DF is a four-stroke engine that
runs on light fuel oil (LFO) or heavy fuel
oil (HFO), and can switch from LFO/
HFO to gas, and vice versa, smoothly
during engine operation.
In its 16V configuration, the 50DF can
provide up to 975 kW per cylinder for
a total maximum mechanical output of
15.6 MW per engine. The 50DF runs at
an engine speed of 500 rpm or 514 rpm
for use with 50-Hz or 60-Hz applications.
The engine has a maximum thermal efficiency
of 47%, which Wärtsilä claims
is higher than for any other gas engine.
" Fuel and operational flexibility are
key factors in delivering the right solution
for this project, " Thanh Pham,
business development manager, Cambodia,
Wärtsilä Energy Business, said
in a statement when the order was
announced. " [The 50DF engines] also
have the flexibility to operate at lower
load during the rainy season, and the
flexibility to integrate renewables into
the system in the future, although the
immediate use will be to provide the
required baseload power. "
September 2021 | POWER
A Fast-Track Project
To meet the project's ambitious timetable,
MAN Energy Solutions chose
a standardized and modular engine
setup with a proven track record. The
schedule required the engines to be
manufactured and delivered to the site
in less than six month, which MAN Energy
Solutions accomplished. A highly
coordinated and elaborate project management
process was also implemented
to ensure the installation remained
on track, the company told POWER.
Among timesaving aspects employed
was a method of safely commissioning
certain components, even while mechanical
work on related systems was
still ongoing.
Meeting EDC's ambitious construction
schedule also called for a high
degree of process efficiency and professionalism
among the project partners.
The project followed a tight timeline to
successfully commission all 11 engines
in less than 20 months. Ultimately, the
MAN project team succeeded despite
the numerous constraints posed by
COVID-19.
" For three months in the spring of
2020, our supervisors were only able
to monitor the assembly of the plant
remotely, " said Martin Höhler, head of
Power for MAN Energy Solutions' AsiaPacific
region. " However, thanks to digital
tools, a special effort by all sides, and
our excellent cooperation with CHMC,
www.powermag.com
we were able to make up this time and
maintain the ambitious schedule. "
At the peak of the construction
phase, about 500 workers were onsite.
A mix of local workers, and expats
from CHMC and MAN, combined
their expertise to build the power
plant. According to MAN, " a proper
HSE [health, safety, and environment]
Management System was implemented
onsite " at the beginning of the
construction phase. A MAN Energy
Solutions spokesperson said the system
" was supported by continuous
training and regular follow-up on HSE
issues with all onsite workers. " Furthermore,
the HSE management system
was monitored on a regular basis,
ensuring onsite safety was constantly
maintained.
State-of-the-Art Monitoring
The Phnom Penh plant utilizes MAN's
multifunction monitoring system (MMS).
The MMS helps to increase engine efficiency
and safety through multiple
features connected to every major component
and engine activity. It monitors
temperatures of the main bearings,
exhaust gas, generator, and lubricating
oil; crankcase pressure; engine speed;
and more. MAN's engine control system-called
SaCoSone-along with its
supervisory control and data acquisition
(SCADA) server system are also used in
the power plant.
MAN Energy Solutions will continue
to support the project for at least the
next five years through a service contract
agreement. MAN PrimeServ, the
company's after-sales brand, will supply
original equipment manufacturer spare
parts, special services, and digital solutions
for the power plant in conjunction
with the deal. SchneiTec Co. Ltd., a
Cambodian operations and maintenance
company, is responsible for operation of
the facility.
The Phnom Penh power plant will initially
run on heavy fuel oil. However, it
is expected that the dual-fuel engines
will operate on natural gas in the future.
" The plant is located directly on the
banks of the Mekong River in the Lvea
Aem district in Kandal Province, with
the potential to add an LNG [liquefied
natural gas] terminal at a later date. Our
engines are designed for natural gas
and can switch seamlessly from one
fuel type to another during operation, "
Höhler explained. ■
-Aaron Larson is POWER's
executive editor.
31
http://www.powermag.com
POWER September 2021

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