Environmental Benefit Assessment for the Carbonation Process of Petroleum Coke Fly Ash in a Rotating Packed Bed
Journal
Environmental Science and Technology
Date Issued
2017
Author(s)
Abstract
A high-gravity carbonation process was deployed at a petrochemical plant using petroleum coke fly ash and blowdown wastewater to simultaneously mineralized CO2 and remove nitrogen oxides and particulate matters from the flue gas. With a high-gravity carbonation process, the CO2 removal efficiency was found to be 95.6%, corresponding to a capture capacity of 600 kg CO2 per day, at a gas flow rate of 1.47 m3/min under ambient temperature and pressure. Moreover, the removal efficiency of nitrogen oxides and particulate matters was 99.1% and 83.2%, respectively. After carbonation, the reacted fly ash was further utilized as supplementary cementitious materials in the blended cement mortar. The results indicated that cement with carbonated fly ash exhibited superior compressive strength (38.1 ± 2.5 MPa at 28 days in 5% substitution ratio) compared to the cement with fresh fly ash. Furthermore, the environmental benefits for the high-gravity carbonation process using fly ash were critically assessed. The energy consumption of the entire high-gravity carbonation ranged from 80 to 169 kWh/t-CO2 (0.29-0.61 GJ/t-CO2). Compared with the scenarios of business-as-usual and conventional carbon capture and storage plant, the economic benefit from the high-gravity carbonation process was approximately 90 and 74 USD per ton of CO2 fixation, respectively.
Subjects
Carbon; Carbon Dioxide; Carbonates; Coke; Materials Testing; Particulate Matter; Coal Ash; Petroleum
Other Subjects
Carbon; Carbon capture; Carbon dioxide; Cements; Compressive strength; Energy utilization; Flow of gases; Fly ash; Nitrogen; Nitrogen oxides; Nitrogen removal; Packed beds; Petrochemical plants; Petroleum coke; Business-as-usual; Carbonation process; Environmental benefits; Particulate Matter; Removal efficiencies; Rotating packed bed; Supplementary cementitious material; Temperature and pressures; Carbonation; carbon; carbon dioxide; cement; coke; nitrogen oxide; petroleum; carbonic acid derivative; coke; chemical reaction; compressive strength; energy efficiency; environmental assessment; fly ash; gas flow; nitrogen oxides; particulate matter; pollutant removal; wastewater treatment; air pollutant; Article; carbonation; chemical modification; compressive strength; energy consumption; environmental temperature; flow rate; flue gas; fly ash; gas flow; gravity; mineralization; packed bed reactor; particulate matter; storage; waste water; materials testing; Carbon; Carbon Dioxide; Carbonates; Coal Ash; Coke; Materials Testing; Particulate Matter; Petroleum
Publisher
American Chemical Society ({ACS})
Type
journal article