Thermodynamic analysis on the transient cycling of coal-fired power plants: Simulation study of a 660 MW supercritical unit

Chaoyang Wang, Ming Liu, Bingxin Li, Yiwen Liu and Junjie Yan

Energy, 2017, vol. 122, issue C, 505-527

Abstract: The flexibility of coal-fired power plants must be improved to satisfy load fluctuations in power grids caused by the rapid spread of power generation capacity from unpredictable renewable energy sources. Startups, shutdowns and large amplitude load cycling have become normal operational states for coal-fired power plants in recent years. The extremely high thermal inertia of a power plant influences the energy consumption of the power plant in load fluctuation processes. To obtain the energy consumption characteristics of power units during transient cycling processes, dynamic models of a 660 MW supercritical unit were established with the GSE software. The heat storage and control systems of the unit were considered. The energy consumption of the power plant was obtained at different cycling rates and compared with the results calculated with steady-state models. Results show that compared with those obtained with steady-state models, the standard coal consumption rate (SCCR) of the power plant increased by 3.57 g (kW h)−1, which accounts for 1.3% of SCCR at most during the load-up process, and decreased by 2.96 g (kW h)−1, which accounts for 1.0% of SCCR at most during the load-down process. The average SCCRs of these dynamic and steady-state models differed when the load cycling rates were different. When the load varied between 50% THA and 75% THA, the maximum difference of standard coal consumption rate variation (SCCRV) were 1.2 and 0.26 g (kW h)−1 during the load-up and load-down transient processes, respectively. The maximum differences in SCCRV were 0.85 and 0.34 g (kW h)−1 during load-up and load-down transient processes, respectively, with the load ranging from 75% THA to 100% THA.

Keywords: Thermal system simulation; Coal-fired plant; Transient process; Load cycling; Energy consumption (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (32)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544217301305
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:122:y:2017:i:c:p:505-527

DOI: 10.1016/j.energy.2017.01.123

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().