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Abstract

Intermediate storage of CO2 is part of the Carbon Capture and Storage chain. Conventional choice for storage would be steel tanks above ground. Another option would be storing CO2 in underground caverns in crystalline bedrock. Storage of CO2 in caverns would be carried out in liquid form which requires low temperatures and high pressures (for example -40 centigrades and 10 bars respectively). Finite element modelling shows that storage of cold liquid CO2 in a rock cavern would induce a large heat flow from bedrock to the store and cause a significant thermal effect on the surroundings of the cavern. Storage would require constant cooling and it would be advantageous to cool the bedrock surrounding the store before actually storing CO2. Modelling indicates that the optimal store geometry minimizes the cavern wall surface area and that the optimal storage depth is neither too shallow nor too deep (between 50 and 200 metres). Furthermore, the temperatures of the surrounding bedrock would quickly drop below zero centigrades and the radius of the frozen zone around the store would extend to hundred metres after 100 years of storage. However, the thermal disturbance caused by storage might not have a significant effect on ground temperatures.

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/content/papers/10.3997/2214-4609.201414311
2015-10-13
2024-03-28
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201414311
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