Patent ID: 8656868

Claim:
A heat exchanger for a thermo boiler using solid fuel in particles, the heat exchanger comprising: a tube bundle including a plurality of tubes; a furnace; and a double wall jacket connected to the tube bundle, wherein the heat exchanger defines a space over the furnace, and the heat exchanger further includes a slab dividing the space and the tube bundle, the slab defining openings, and the tubes of the tube bundle traversing the slab via the openings, the tube bundle being rigidly fixed to the slab, the slab defining a longitudinal dimension extending away from the furnace such that combustion smoke is forced to go upwards along the tube bundle on a side of the slab and to go downwards on an opposite side of the slab, thus flowing along the tube bundle two times, the slab including a lower part and an upper part, the upper part being perpendicular to the tubes and traversed by the tubes; a first scraping plate, the first scraping plate being positioned on a first side of the slab; a second scraping plate, the second scraping plate being positioned on a second side of the slab, the second side being opposite the first side; a bar controllable from outside the heat exchanger, the bar traversing the slab and a side of the double wall jacket, the bar being configured to move the first and second scraping plates.