The temperature of Britain's coalfields

Author:

Farr G.1ORCID,Busby J.2ORCID,Wyatt L.3ORCID,Crooks J.3,Schofield D.I.4ORCID,Holden A.1

Affiliation:

1. British Geological Survey, Park Place, Cardiff CF10 3AT, UK

2. British Geological Survey, Nicker Hill, Keyworth NG12 5GG, UK

3. The Coal Authority, 200 Lichfield Lane, Mansfield NG18 4RG, UK

4. British Geological Survey, The Lyell Centre, Edinburgh EH14 4AP, UK

Abstract

Low-temperature heat recovery, cooling and storage schemes, using abandoned flooded mine workings, are a viable option for low-carbon heating solutions within many abandoned British coalfields. The temperature of mine water is a useful parameter, coupled with depth to water, sustainable yield and recharge potential, to identify suitable locations and calculate the likely performance of heat recovery schemes. This paper aims to provide the first mapping and synthesis of the temperature of Britain's coalfields to support this emerging technology. Using the best available evidence, a median geothermal gradient of 24.1°C km−1 was calculated for the British coalfields. However, geothermal gradients between separate coalfields can vary from 17.3 to 34.3°C km−1. The North East, Cumbria and Yorkshire coalfields all have mean geothermal gradients generally >30°C km−1, whereas geothermal gradients of generally <23°C km−1 are measured in the Warwickshire, South Wales, Staffordshire, Douglas and Fife coalfields. Active dewatering schemes are shown to locally increase the apparent measured geothermal gradient by ingress and mixing of deeper water into the pumping shafts. This baseline spatial mapping and synthesis of coalfield temperatures offers significant benefit to those planning, designing and regulating heat recovery and storage in Britain's abandoned coalfields.

Publisher

Geological Society of London

Subject

Earth and Planetary Sciences (miscellaneous),Geology,Geotechnical Engineering and Engineering Geology

Reference71 articles.

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4. Anon. 1919–20 . First report to the committee on ‘The control of atmospheric conditions in hot and deep mines’. Transactions of the Institution of Mining Engineers, LVIII, 231–256.

5. Innovative approach for heating of buildings using water from a flooded coal mine through an open loop based single shaft GSHP system. Clean, efficient and affordable energy for a sustainable future: The 7th International conference on Applied Energy (ICAE2015);Anthresh;Energy Procedia,2015

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