METHOD OF STEPWISE FIRING WITH OPTIMISED INJECTION OF PRIMARY OXIDISER Russian patent published in 2009 - IPC F23D14/22 

FIELD: heating.

SUBSTANCE: invention relates to power engineering. The proposed method of fuel firing with oxygen-containing gas wherein fuel jet is injected and, at least, two jets of oxygen containing gas that features high oxygen content. Note here that the 1^st jet of aforesaid gas, called a primary jet, is injected to allow its contact with the fuel jet and to form the 1^st incomplete firing. Note here that outlet gases, thereafter, contains, nevertheless, at least, one fraction of fuel. Note also that the 2^nd aforesaid jet is injected at the distance from the fuel jet to allow firing together with the said 1^st fuel fraction existing in outlet gases after 1^st firing. The oxidiser primary jet is divided into two primary jets, that is, 1^st primary jet, called the central primary oxidiser jet injected into fuel jet centre and 2^nd primary jet called the embracing primary jet injected coaxially and around the fuel jet. The rate of the oxidiser central primary jet injection exceeds that of fuel jet injection. The fuel jet injection rate exceeds that of the 1^st embracing oxidizer injection. The oxidiser 2^nd jet injection rate exceeds that of the oxidiser embracing primary jet. The distance between the oxidiser central primary jet injection and its 2^nd jet injection vs the rate of injection of the oxidiser 2^nd jet varies between 10^-3 and 10^-2. The oxidiser 3^rd jet is injected at the point located between the point of injecting the oxidiser central primary jet and that of injecting 2^nd oxidising jet. The rate of injecting oxidiser 2^nd jet exceeds that injecting oxidiser 3^rd jet. The distance between the point of injecting oxidiser 2^nd jet and that of injecting oxidiser central primary jet vs the distance between the point of injecting oxidiser 3^rd jet and that of injecting oxidiser primary jet varies from 2 to 10. Two primary oxidiser jets feature identical oxygen concentration. The oxidizer central primary jet oxygen concentration exceeds that of oxidiser embracing primary jet.

EFFECT: higher furnace reliability.

10 cl, 1 dwg