GAS HEATING METHOD Russian patent published in 2014 - IPC F23D14/66 

FIELD: heating.

SUBSTANCE: gas is heated in a heating chamber separated from a combustion chamber. The heat exchange surface of the heating chamber casing is heated by a system of small flames with the effect of surface burning on the heating chamber casing. The small flame system is formed by the interaction of the fuel flow supplied parallel to the walls of the heating chamber casing and the air flow supplied perpendicular to the walls of the heating chamber casing. Gas is heated in the heating chamber by the interaction of the system of perpendicular jets of the gas being heated, with the heat exchange surface of the heating chamber casing attacked by the system of perpendicular flames of the combustion chamber on the opposite side.

EFFECT: provision for effective heating of different gases, including flammable ones, and the air with no direct contact of the gases being heated, with flue gases and no further mixture of them.