期刊
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
卷 27, 期 -, 页码 267-278出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2014.06.011
关键词
Oxy-steam combustion; O-2/CO2 recycled combustion; Simulation; Aspen Plus; Exergy
类别
资金
- National Natural Science Foundation of China [51276072, U1261204]
- National Basic Research Program of China [2013CB228501]
Oxy-steam combustion is proposed as an alternative for the next generation oxy-fuel combustion technology. In order to justify the economic feasibility of this novel oxy-fuel combustion, a conventional 600 MWe pulverized-coal-fired power plant in China is selected to be retrofitted to oxy-steam combustion and O-2/CO2 recycled combustion separately, whilst the O-2/CO2 recycled combustion system serves as the base case for comparisons. The modeling and simulation of these two systems are carried out with Aspen Plus version 11.1. Simulation results indicate that on the same boundary conditions, the mass flow of the main steam and reheated steam in the oxy-steam combustion system must be reduced by 0.84%, which makes the net energy efficiency of the oxy-steam combustion system decrease by 0.15%. The comparative exergy analyses reveal that the net exergy efficiency of the oxy-steam combustion system is 0.153% lower than that of the O-2/CO2 recycled combustion system. The marked increase of the exergy destruction happening in the oxy-steam combustion furnace is the fundamental cause of the decrease of the exergy efficiency. (C) 2014 Elsevier Ltd. All rights reserved.
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