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In view of the spontaneous combustion of coal piles, waste of resources and environmental pollution, gravity heat pipes are inserted into coal piles, and the heat inside the coal piles will be extracted in time because of the high-efficiency thermal conductivity of the heat pipe phase change. In order to achieve energy conservation and environmental protection, a thermoelectric energy conversion device based on gravity heat pipe was designed, which can convert heat energy extracted from thedoi:10.5539/eer.v9n2p30 fatcat:yshj7ob2q5azncdcxf7dxei2yu