Open Collections

UBC Faculty Research and Publications

Energy and Economic Assessment of Oxy-Fuel Combustion CO₂ Capture in Coal-Fired Power Plants Yuan, Yuyang; Wang, Lei; Zhuang, Yaming; Wu, Ying; Bi, Xiaotao

Abstract

Oxy-fuel combustion technology replaces air with a mixture of pure O₂ and recycled flue gas for coal combustion, which leads to difficulties in the waste heat recovery of flue gas in the boiler tail of coal-fired power plants. This paper proposes a new integration scheme for waste heat recovery of flue gas in coal-fired power plants with oxy-fuel combustion CO₂ capture. By introducing an oxygen preheater, a recycled flue gas preheater, and a low-pressure economizer, the waste heat of flue gas is fully recovered to preheat oxygen, recycled flue gas, and feed water, respectively. The proposed scheme simultaneously ensures the safe operation of the recycled fan and improves the thermal performance of the coal-fired power plants. Compared to the air combustion configuration, the boiler’s efficiency and gross power efficiency in the oxy-fuel combustion configuration are increased by 0.42% and 1.29%, respectively. Due to power consumption for the added equipment, the net power efficiency is reduced by 10.41%. A techno-economic analysis shows that the cost of electricity for oxy-fuel combustion in coal-fired power plants has increased from USD 46.45/MWh to USD 80.18/MWh, and the cost of the CO₂ avoided reaches USD 43.24/t CO₂.

Item Metadata

Title
Energy and Economic Assessment of Oxy-Fuel Combustion CO₂ Capture in Coal-Fired Power Plants
Creator
Yuan, Yuyang; Wang, Lei; Zhuang, Yaming; Wu, Ying; Bi, Xiaotao
Publisher
Multidisciplinary Digital Publishing Institute
Date Issued
2024-09-15
Description
Oxy-fuel combustion technology replaces air with a mixture of pure O₂ and recycled flue gas for coal combustion, which leads to difficulties in the waste heat recovery of flue gas in the boiler tail of coal-fired power plants. This paper proposes a new integration scheme for waste heat recovery of flue gas in coal-fired power plants with oxy-fuel combustion CO₂ capture. By introducing an oxygen preheater, a recycled flue gas preheater, and a low-pressure economizer, the waste heat of flue gas is fully recovered to preheat oxygen, recycled flue gas, and feed water, respectively. The proposed scheme simultaneously ensures the safe operation of the recycled fan and improves the thermal performance of the coal-fired power plants. Compared to the air combustion configuration, the boiler’s efficiency and gross power efficiency in the oxy-fuel combustion configuration are increased by 0.42% and 1.29%, respectively. Due to power consumption for the added equipment, the net power efficiency is reduced by 10.41%. A techno-economic analysis shows that the cost of electricity for oxy-fuel combustion in coal-fired power plants has increased from USD 46.45/MWh to USD 80.18/MWh, and the cost of the CO₂ avoided reaches USD 43.24/t CO₂.
Subject
CO₂ capture; oxy-fuel combustion; recycled flue gas; waste heat recovery; thermodynamic and techno-economic performance
Genre
Article
Type
Text
Language
eng
Date Available
2024-10-11
Provider
Vancouver : University of British Columbia Library
Rights
CC BY 4.0
DOI
10.14288/1.0445549
URI
http://hdl.handle.net/2429/89390
Affiliation
Applied Science, Faculty of; Non UBC; Chemical and Biological Engineering, Department of
Citation
Energies 17 (18): 4626 (2024)
Publisher DOI
10.3390/en17184626
Peer Review Status
Reviewed
Scholarly Level
Faculty; Researcher
Rights URI
https://creativecommons.org/licenses/by/4.0/
Aggregated Source Repository
DSpace

Item Media

Item Citations and Data

Rights

CC BY 4.0