The invention provides a
heating furnace capable of recovering
waste heat, and belongs to the technical field of fluid heating, the
heating furnace comprises a furnace body, the furnace body is internally provided with a partition plate for dividing the interior into an upper layer and a lower layer, and the interior of the lower layer is connected with a fuel
pipe, an air inlet
pipe and a
smoke exhaust pipe; a section of snakelike bent
pipe is arranged in the inner
barrel in the axial direction of the inner
barrel, the snakelike bent pipe is horizontally arranged, the two ends of the snakelike bent pipe penetrate out of the two ends of the inner
barrel respectively, one end of the snakelike bent pipe is connected with the end, extending out of the furnace body, of the
smoke exhaust pipe, and heat conduction oil is arranged in the inner barrel; the inner cylinder is coaxially sleeved with the outer cylinder, the front end and the rear end of the outer cylinder are connected with a water inlet pipe and a water outlet pipe respectively, an annular
brush is connected into the outer cylinder in a sliding mode in the axial direction of the outer cylinder, the annular
brush is driven by a linear mechanism, the inner cylinder is sleeved with the annular
brush, and bristles abutting against the inner cylinder are arranged on the inner side of the annular brush; and the brush is used for brushing scale formed outside the inner barrel. The
heating furnace can automatically remove scale on the outer wall of the
smoke exhaust pipeline for heating water, and the
heating efficiency is improved.