Comprehensive investigation of process characteristics for oxy-steam combustion power plants. (15th July 2015)

• Record Type: Journal Article
• Authors: Jin, Bo; Zhao, Haibo; Zou, Chun; Zheng, Chuguang
• Is Part Of: Energy conversion and management. Volume 99(2015)
• Page Start: 92
• Page End: 101
• Publication Date: 2015-07-15
• Subjects: Oxy-steam combustion -- Process simulation -- Exergy analysis -- Techno-economic evaluation -- Solar energy; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2015.04.031
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Oxy-steam combustion exhibits better performance than oxy-CO2 combustion. Cost of electricity in oxy-steam combustion is 6.62% less than oxy-CO2 combustion. The increase of oxygen concentration in oxidant can improve its system performance. The decrease of excess oxygen coefficient can be helpful for its system performance. Integration with solar technology can enhance its thermodynamic performance. Abstract: Oxy-steam combustion, as an alternative option of oxy-fuel combustion technology, is considered as a promising CO2 capture technology for restraining CO2 emissions from power plants. To attain its comprehensive process characteristics, process simulation, thermodynamic assessment, and sensitivity analysis for oxy-steam combustion pulverized-coal-fired power plants are investigated whilst its corresponding CO2 /O2 recycled combustion (oxy-CO2 combustion) power plant is served as the base case for comparison. Techno-economic evaluation and integration with solar parabolic trough collectors are also discussed to justify its economic feasibility and improve its thermodynamic performance further, respectively. It is found that oxy-steam combustion exhibits better performance than oxy-CO2 combustion on both thermodynamic and economic aspects, in which the cost of electricity decreases about 6.62% whilst the net efficiency and exergy efficiency increase about 0.90 and 1.01 percentage points, respectively. The increment of oxygen concentration in oxidant (20–45 mol.%) and decrease of excess oxygen coefficient (1.01–1.09) in a certain range are favorable for improving oxy-steam combustion system performance. Moreover, its thermodynamic performance can be improved when considering solar parabolic trough collectors for heating recycled water, even though its cost of electricity increases about 2 $/(MW h).