The furnace for burning particulate fuel, in particular for the combustion of wood waste, including wood chips, sawdust, bark, wood biomass mixture from household waste, agricultural waste.; The outer casing, which is mounted in the inner-lined body provided with an annular pinch (partition) inside the lined body set its internal surface tangential air nozzles.; The nozzles are configured inside tapered or profiled surface such as a Laval nozzle profile which may be formed at an angle to the front portion, turning to the front part of the nozzle, or have oblique slice.; The nozzles may be formed as an insert.; Between the combustion space and the lining of the inner housing screen is mounted, for example, removable.; Description - page 5, formula - page 1, Fig 5..; 1 SP f-ly, ZP 2
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