METHOD OF DIRECTED INTRODUCTION OF REAGENT TO CONTROL SLAG FORMING AS RESULT OF COMBUSTION OF COAL WITH INCREASED CONTENT OF IRON AND/OR CALCIUM Russian patent published in 2013 - IPC C10L10/00 C10L10/04 C10L10/06 

FIELD: machine building.

SUBSTANCE: invention refers to a method of reduction of cohesive properties of slag and/or its adhesion ability to surface of a furnace chamber and thus reducing degree of contamination. The above method involves combustion of slag-forming coal in combustion zone; coal with increased iron content exceeding approximately 15% is used considering weight of ash and expressed as Fe₂O₃ and/or calcium content exceeding 5% considering weight of ash and expressed as CaO, at total excess oxygen; removal of gaseous combustion products through heat-exchange equipment under conditions providing cooling of the slag formed at fuel combustion; and introduction to combustion zone of the furnace chamber till contact with the above heat-exchange equipment, to gaseous combustion products of aqueous aluminium trihydroxide in the amount, with drop size and in the concentration forming nanoparticles with the size of less than 200 nm in hot gaseous combustion products, which are optimum to reduce contamination degree and to improve friable properties of the obtained slag. The invention also refers to a method for removal of slag deposits from a furnace chamber and a furnace chamber cleaning and maintenance method.

EFFECT: effective slag control; higher operating efficiency of a furnace chamber.

8 cl, 2 dwg, 2 ex