Fuel injector lance, esp. for blast furnace blower - has inclined high speed atomising ducts and radial outlets

摘要

To inject fuel into an air blast heater and improve its combustion, the fuel is vapourised into a medium-possibly a mixt. of air and steam, and is injected into a gas flow within the heater at an angle between 60 and 120 degrees to the lengthways direction of the gas flow. The fluid is vapourised by contact with the gaseous medium fed in at a speed at least equal to that of sound, and the vapourised fuel is also injected into a heater flow at the speed of sound. Method overcomes both the difficulties of the accumulation of soot from the long flames of axial injection lances and the uneven distribution of the fuel in the hot air blast, at the high injection speeds necessary in radial lances, ensuring improved combustion and efficiency. The deflection of the injected fuel jet into the gas source of the air blast heater, prevents its striking against the sides and causing damage to the walls of the heater. The press. of the gas and the fuel can be adjusted to give the required distribution and injection press., more efficient combustion is ensured and larger quantities of fuel can be used.