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Mabuza, Major
- Low-High Temperature Flue Gas Direct Injection in South African Bituminous and Anthracite Coals:Sorption Capacity Assessment
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Authors
Affiliations
1 Department of Chemical Engineering, Vaal University of Technology, P.O. Box 3595, Secunda, 2302, ZA
2 Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, ZA
3 School of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, ZA
1 Department of Chemical Engineering, Vaal University of Technology, P.O. Box 3595, Secunda, 2302, ZA
2 Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, ZA
3 School of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, ZA
Source
Current Science, Vol 115, No 4 (2018), Pagination: 682-691Abstract
Numerous studies have been carried out recently on the sequestration of carbon dioxide (CO2), a greenhouse gas, produced due to human activities. Consequently, storage of CO2 in storage sites, such as unmineable coal seams, has been identified as one of the promising options with the advantage of recovering coal-bed methane (CH4). However, CO2 injected into coal seams contains additional gases that may reduce storage capacity, cause changes in sorption behaviour and physicochemical properties of coal. This research was aimed at investigating the sorption behaviour of three South African coals (sorbents) upon pure CO2 and flue gas (sorbates) sorption. Measurements were conducted on 10 g samples with a grain size <2 mm. A synthetic industrial flue gas containing 12% CO2, 5.5% O2, 82% N2, 0.38% SO2 and 0.12% NO2 was used in the study. Sorption isotherms were measured at a temperature ranging from 30 to 60°C and pressures up to 9 MPa using a high-pressure CO2 volumetric adsorption system (HPCVAS). Sorption of CO2 by coal was highly reduced in the presence of additional gases due to competition for sorption sites. The reduction in CO2 (in flue gas) sorption capacity of coal was up to 63% compared to sorption of pure CO2.Keywords
Carbon Dioxide, Coal, Flue Gas, Preferential Sorption, Sorption Capacity.Full Text
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