A new type boiler based on the principle of high air temperature flame-free combustion has been introduced. The ways for realizing the said combustion in the furnace and the arrangement of fuel nozzles of the boiler have been discussed. The features of said boiler and the technical routes for its development have been analyzed. The heart of said boiler is the application of recuperating type fuel nozzles based on the partitioned combustion and the recirculation of flue gas. The matrix of said fuel noozzles absorbs the sensible heat of flue gas with furnace temperature

producing high temperature air with almost identical temperature in the furnace. The fuel nozzles can be concentratively or symenetrically arranged

installing in the outer space of a furnace or in the furnace walls. The said boiler has many advantages

such as high efficiency

energy-saving

low emission of NO x pollutants

and compact structure etc.