DETAIL:- A Nozzle in accordance with the present invention is used advantageously in heat engineering to bring fluidizing gas to a furnace of a fluidized bed boiler. According to a most preferred embodiment, Nozzles are used for removing from a furnace soild particles drifted to the bottom of the furnace. Gride nozzle comprises a nozzle chamber & a nozzle channel ending to a blow opening of the no