Mobility of elements released from coal during CO₂ sequestration
by Changjiang Liu; Geoff Wang; Shuxun Sang; Huihu Liu; Kun Zhang
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 20, No. 2, 2019

Abstract: A key greenhouse emission reduction strategy is to sequestrate CO₂ in the subsurface by injecting it into coal seams. We investigated the injection of CO₂ into coal seams using static batch experiments conducted under similar temperature and pressure conditions to that of the formation from which the coal samples were originally obtained, in an effort to understand the mobilisation of elements released from the coal. Anthracite and high volatile bituminous coal samples (4-8 mm in size) were exposed to a solution of supercritical CO₂ (ScCO₂) and water at a temperature of approximately 40°C and a pressure of 9.8 MPa. The results obtained indicate that elements show different mobilities after exposure to the ScCO₂-H₂O solution. Their mobilities are mainly influenced by the occurrence of the elements in the coal minerals. It was found that the mobilisation of elements associated with carbonate minerals was greater than that of elements associated with sulphide and sulphate minerals; which was in turn greater than that of elements associated with silicate minerals. The results also show that close attention should be paid to the potential environmental hazards that might arise if the elements are released into groundwater systems during the CO₂ sequestration process. [Received: December 16, 2015; Accepted: June 18, 2017]

Online publication date: Wed, 23-Jan-2019

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Oil, Gas and Coal Technology (IJOGCT):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com