| Turbine technology developments


Doosan looks to expand its gas turbine business


The recent award of a long-term service agreement for an H class gas turbine, plus several orders for H class combined cycle plants, are seen by Doosan as further key steps towards realising its aspiration to become a player in advanced gas turbine technology


Doosan Enerbility reports that it has signed a long-term service agreement (LTSA) with Korea Southern Power (KOSPO) covering maintenance services for the Korean-made H-class – aka K-Gas – 380 MW gas turbine to be supplied by Doosan for the Andong unit 2 combined cycle power plant. The gas turbine is being provided under an agreement Doosan signed with KOSPO in January 2024 and marks Doosan’s first successful winning of an LTSA agreement for a gas turbine that it has supplied. The Andong 2 combined cycle power plant, with an installed capacity of 569 MW, is to be built in Pungsan-eup, Andong City, for completion by March 2027. Based on the LTSA, Doosan’s scope will include: supply of hot parts; maintenance; performance assurance; and implementation of digital technologies (eg, Doosan’s PreVision (early warning diagnostics) and RMS (Remote Monitoring Service)). The duration of the LTSA contract is ten years from completion of power plant construction. “Given that long term services for gas turbines require the highest level of comprehensive expertise, this used to be an area monopolised by foreign original equipment manufacturers,” notes Doosan. But the signing of the new LTSA will not only enable Doosan to “solidify its position in the market as a leading OEM of gas turbines,” it will also help Doosan “secure a stable source of revenue for the long term”, the company says.


Work underway on a Doosan H class gas turbine (Gimpo project)


“This contract with KOSPO marks the first time that Korea’s gas turbine industry has independently taken on the entire process from manufacturing of the product to maintenance services,” said Seungwoo Sohn, CEO of Doosan Enerbility’s Power Services Business Group, observing that the Korean indigenous H class gas turbine “is a product that was developed through the joint efforts of 340 parties”, from Korean industry, academia and research sectors. A relative latecomer to advanced gas turbine technology, Doosan signed its first H class (turbine inlet temperature >1500°C) gas turbine supplier agreement in 2019 with KOWEPO (Korean Western Power) for a 280 MW machine to be part of the Gimpo CHP demonstration plant. This achieved commercial operation in mid 2023.


Bundang combined cycle power plant (Source KOEN)


In June 2023, Doosan reported its first supplier agreement for a 380 MW H class gas turbine, to be supplied to KOMIPO (Korea Midland Power) for its Boryeong combined cycle power plant.


As already noted, a contract was placed for the Andong 2 H class gas turbine (380 MW) in January 2024, and that for the 380 MW H class gas turbine for the Bundang power plant block 1 modernisation project in June 2024. The latter contract, worth KRW 260 bn, was signed with KOEN (Korea South-East Power), and the scope includes a steam turbine plus heat supply equipment.


The Andong 2 combined cycle contract placed by KOSPO was worth around KRW 280 billion. As well as the gas turbine Doosan is also supplying a steam turbine and HRSG.


Doosan’s gas turbine offerings


Doosan’s involvement with gas turbine technology goes back to the 1990s. In 2005 it completed development of a 5 MW gas turbine incorporating “our own technology”, the company says. It was also a major player in HRSGs, steam turbines and balance of plant. Doosan started development of a 270 MW H class gas turbine in 2013, subsequently


working on an upgraded version, a 380 MW class machine. The company’s current H class gas turbine offerings are the DGT6-300H.S1 (270 MW) and the DGT6-300H.S2 (380 MW), with simple cycle efficiencies of >40% and >43%, respectively, and NOx


(without SCR), 15 and 30 ppm, respectively.


Both employ four-stage turbines, with the Doosan Optimised Clearance Control System. Printed circuit heat exchanger technology is used in the turbine air cooling system, 5% the size of conventional heat exchangers, says Doosan. In 1-on-1 combined cycle configuration, installed capacity is >400 MW and >570 MW,


respectively, for the two turbine options, with efficiency of >60% and >63%, respectively. In 2-on-1 configuration, installed capacity is >800 MW and >1140 MW and efficiency >60% and >63%, respectively. Doosan’s substantial investment in comprehensive gas turbine manufacturing facilities has included construction of a full-speed, full-load in-house test facility, located in Changwon, Korea.


Doosan Enerbility says it has been engaged in a close partnership with KOSPO on gas turbines for a number of years, with KOSPO currently having Korea’s biggest gas turbine fleet. Since 2018, the two companies have been jointly carrying out a project aimed at developing indigenously manufactured hot components for F class (turbine inlet temperature 1300- 1400°C) gas turbines, with plans to execute a demonstration project at the Busan combined cycle power plant. Moreover, in 2022, Doosan signed a contract to perform lifetime extension work on gas turbine rotors at Busan. Looking further ahead, Doosan Enerbility says it plans to “further boost” its gas turbine business, with a target of “winning over KRW 7 trillion worth of new gas turbine orders in the Korean domestic market over the next five years.”


It is also participating in a Korean state-led project aimed at developing a 50% hydrogen co-fired F-class gas turbine and the development of a 400 MW 100% hydrogen-fuelled gas turbine, with a “target deadline” of 2027.


www.modernpowersystems.com | July/August 2024 | 27


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