METHOD OF COOLING LANCE MULTIHOLE HEAD AND LANCE HEAD FOR METHOD EMBODIMENT Russian patent published in 2001 - IPC

FIELD: designs and methods of cooling of lance multihole heads used in metallurgical, chemical, machine-building, power machine-building, construction and other industries. SUBSTANCE: method of cooling includes direction of entire supplied cooling liquid, first, to inlet header of lance head where it is uniformly dosed and distributed between longitudinal symmetrical ribbed channels of external cooling of each nozzle relating to the same class with respect to flow rate characteristics, and outer flange made as integral part of said nozzle; then dosed flow rate of cooling liquid is supplied at uniform velocity over circular perimeter to each welded seam connecting outlet flanges of oxidizer nozzles with end bottom of lance head to cool these seams and reduce thermal stresses in them. Further on, all cooling liquid used for cooling of end bottom of lance head is concurrently directed to discharge header and further to path of discharge of lance cooling liquid. Multihole lance head has inlet and outlet successively located thin-walled headers connected with inlet and outlet paths of cooling liquid. Headers are hydraulically interconnected by means of longitudinal symmetrical ribbed channels belonging to the same class with respect to their flow rate characteristics and closed from outside with thin-walled jacket-shell. Ribbed channels are made over external wall of each oxidizer nozzle and is integral with oxidizer nozzle. Each outlet flange of oxidizer nozzle has pressed-in high-melting rounded insert. Outlet sections of all ribbed channels at welded seams of each outlet flange form circular perimeter. All welded seams which are exposed to effect of radiation heat exchange are protected with high-melting coatings. EFFECT: increased service life, stability and serviceability of lance head due to improved process of its cooling, removal of welded seams from zone of action of matched rotating toroidal and cylindrical vortexes and return vortex rear flows containing burning drops of liquid metal; reduced lance weight and cost. 2 cl, 4 dwg, 1 ex