Reducing the Superheating of Extraction Stream on Advanced-Ultra Super Critical Power Plants with
Regenerative Turbines in South Korea: An Economic Analysis
SCIE
SCOPUS
- Title
- Reducing the Superheating of Extraction Stream on Advanced-Ultra Super Critical Power Plants with
Regenerative Turbines in South Korea: An Economic Analysis
- Authors
- Cho, Dong-Jin; LEE, EUL BUM; JO, JAE MIN; Alleman, Douglas
- Date Issued
- 2019-05
- Publisher
- Multidisciplinary Digital Publishing Institute (MDPI)
- Abstract
- In this study, an advanced-ultra super critical (A-USC) simulation model was developed
using the Performance Evaluation of power system efficiencies (PEPSE) software and data collected
from a 500 MW ultra-supercritical (USC) coal-fired power plant in South Korea. Using the
operational USC and a typical A-USC power plant steam conditions, the model analyzed the impacts of
adding an additional feedwater heater (FWH) and reheater to the baseline single reheater (SR) and 8
FWH case. Through the process of introducing reheat and/or regenerative cycles, the authors found:
(1) A-USC steam conditions offers an approximate 4% power plant efficiency increase in comparison
to the baseline USC steam conditions and; (2) power plant efficiencies increase approximately 1.5%
when a 9th FWH and double reheater are added, however; (3) this also results in an approximate 64
◦C increase in the superheating of extraction stream. This excessive rise in the superheating of
extraction steam was found to cause overall energy loss, reducing the overall efficiency of the
power plant. Therefore, it was surmised that if the increase in the superheat degree of extraction
steam from the improved steam cycle, which can effectively reduce, the efficiency of the power
plant could be further improved. To determine the efficiency variations based on the reduction of
the superheat degree of extraction steam, the authors applied a regenerative turbine (RT) to the
model. Introducing the RT to the A-USC DR and 9 FWH was found to decrease from the average
extraction steam temperature from 221 ◦C to 108 ◦C and result in an increase in power plant
efficiency of approximately 0.3% to 49.5%. An economic analysis was also performed to assess the
fiscal feasibility of adding an RT. Assuming the initial investment to be USD 1409 million,
implementing an RT equated to a net present value increase of approximately USD 33 million as
compared to that of similar life (30 years of durability) expectancy of A-USC without using an RT.
The findings of this study have the potential to improve South Korea’s energy policy, reducing the
superheat degree of extraction steam that rises excessively during A-USC steam condition
optimization. While this study is focused on South Korea, said findings are also generalizable to
worldwide energy policies, serving as an effective method to not only increase system efficiencies,
but enhance the economic feasibility as well.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/98736
- DOI
- 10.3390/en12091681
- ISSN
- 1996-1073
- Article Type
- Article
- Citation
- Energies, vol. 12, no. 9, page. 1681, 2019-05
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.