POWER September 2023 - 11

GLOBAL MONITOR
to numerous difficulties in achieving efficient maintenance services, "
Doosan noted.
As part of the national project that will run until December
4. Korea Western Power Co. (KOWEPO) has begun commercial operation
of a 270-MW gas turbine it developed with Doosan Enerbility
at the 500-MW Gimpo Combined Heat and Power plant in Gyeonggi
Province. South Korea's first domestically produced gas turbine, the
" K-Gas Turbine " measures a compact 11.5 meters in length and weighs
330 tons, making it smaller and lighter compared to a conventional
steam turbine. Courtesy: KOWEPO
ment manufacturers (OEMs)-General Electric, Siemens Energy,
Mitsubishi Power, and Ansaldo Energia-are headquartered.
" Gas turbine development began with the securing and
development of our own technical expertise and manpower,
and by establishing manufacturing facilities, process management,
and test shop all in-house, we have created a system
that allows an α to Ω technology implementation in one place, "
Doosan noted. To accelerate progress, the company initially invested
$830 million as part of the national program on research
and development of a new 270-MW class large gas turbine
model. By 2019, the company had cemented contracts with
KOWEPO for the construction of the 500-MW Gimpo CHP
plant (Figure 4). The 270-MW gas turbine (DGT6-300H.S1)-
which KOWEPO has dubbed the " K-Gas Turbine " -on July 28
completed a continuous 240-hour operational test and kicked
off commercial operation fired with liquefied natural gas (LNG),
KOWEPO confirmed.
According to Doosan, the 270-MW DGT6-300H.S1 features
an efficiency of more than 40%. Testing after first fire
was achieved in March 2022 included state-required combustion
adjustment tests, power variation tests, and emergency
shutdown tests, KOWEPO noted. During the manufacturing
process at Doosan's Changwon facility in South Gyeongsang
Province (where Doosan is headquartered), KOWEPO said it
installed more than 3,000 instruments to assess and maintain
the gas turbine's reliability. The utility now intends to carry out
8,000 hours of demonstration operation linked to the national
grid, data that will help it develop the " next generation of K-gas
turbines " and support ambitions to export the model.
Driven by market forces, Doosan in tandem set out to develop
the DGT6-300H.S2, a 380-MW H-class model that leverages
a superalloy designed to withstand high temperatures
of 1,500C and higher, and features an efficiency of more than
43%. But Doosan's recent contract with KOMIPO also includes
supply of a steam turbine and HRSGs-potentially making the
Boryeong New Combined Cycle Power Plant the world's first
project equipped with a South Korean-standard combined cycle
gas turbine (CCGT) model.
Doosan said it has since 2021 leveraged expertise from
340 parties in South Korea's domestic industry, academia, and
research sectors to develop the CCGT model. The effort has
been crucial to ensure reliability, it suggested. " The gas-fired
combined cycle power plants in Korea until now had applied
various types of foreign-made gas turbine models, which led
September 2023 | POWER
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11
2027, Doosan and domestic partners are also pursuing development
of a CCGT that will be ready to co-fire up to 50% hydrogen.
Under that endeavor, Korea East-West Power (KEWP)
will convert a 25-year-old E-class gas turbine at the Ulsan Combined
Cycle Power Plant into a 270-MW H-class hydrogen gas
turbine (Figure 5). The conversion could result in substantial
costs savings, Doosan suggested.
" With a high-efficiency H-class hydrogen gas turbine, fuel
costs can be saved by up to approximately KRW 70 billion [$53
million] annually compared to that of the existing (E-class) hydrogen
gas turbines, " it says. However, that assumes average
KOGAS fuel and hydrogen costs for the first half of the year,
and that the 50% hydrogen gas turbine has an annual operating
rate of 50%. Meanwhile, " If hydrogen is used as 50% of
the fuel mix, this would lead to a maximum 21.4% reduction of
carbon emissions compared to the existing 100% LNG-fueled
gas turbines, " it says.
Finally, and perhaps in what could be their crowning endeavor,
Doosan and South Korean partners are also separately
developing a 400-MW " ultra-large " 100% hydrogen-fueled gas
turbine by December 2027. " The aim is to finish development
of the combustor, a key component of the 100% hydrogenfueled
gas turbine, by 2026, " Doosan said.
The tight timeline conforms to South Korea's energy goals
in its 10th Basic Plan of Long-Term Electricity Supply and Demand,
which MOTIE published in January. The plan seeks to
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POWER September 2023

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