FIELD: prolonged combustion furnaces. SUBSTANCE: case of the furnace is made of pig iron sections connected together hermetically sealed. The sections have cavities which form multiturn chimney system. Vertical channels are used for supplying heated air to entrance holes of chimneys. Lime is provided under the furnace provided with removable fire grate and scoop-metering device. EFFECT: improved efficiency. 3 cl, 5 dwg
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