A converter for the production of steel by a blowing process from a substantially liquid raw material, in particular pig iron, includes several injectors which are dispersed in the sidewall of the converter about the converter inner circumference and directed towards the bath level for refining the pig iron. The injectors are designed as supersonic nozzle, which are surrounded by a ring nozzle forming an enveloping gas jet. The injectors are oriented at an angle of max. 43 in relation to the bath surface, with oxygen being introduced through the supersonic nozzle and a mixture of compressed air and natural gas being introduced through the ring nozzle. The jet pulse for the oxygen jet fed through the supersonic nozzle is dimensioned such that an infiltration of the oxygen jet into the melt bath is ensured.

The disclosure relates to an arrangement (1) for an induration machine (2) of a pelletizing plant (4), the arrangement (1) comprising: a furnace (6) configured for induration of iron ore pellets (8); an inlet channel (10) connected to the furnace (6), configured for supplying process gases (12) to the furnace (6); an outlet channel (14) connected to the furnace (6), configured for remove the process gases (12) from the furnace (6); and a burner (16) arranged in the inlet channel (10) configured for heating the process gases (12), wherein the burner (16) comprises: a central first burning register (18) configured for supplying hydrogen (20) as injecting fuel; at least one intermediate second burning register (22), which at least partly surrounding the central first burning register (18), and which is configured to inject oxygen (24) as an oxidizing gas to burn together with the hydrogen (20), and at least one outermost third burning register (26), which at least partly surrounding the intermediate second burning register (22), and which is configured to inject a protecting fluid (24, 32) for preventing at least a part of the process gases (12) to burn together with the hydrogen (20) and the oxygen (24) as an oxidizing gas. The disclosure further relates to an induration machine (2) and a method for indurating iron ore pellets (8) in arrangement (1) for an induration machine (2) of a pelletizing plant (4).

A burner comprises a primary nozzle for injecting an oxygen-rich gas. The primary nozzle is designed as a supersonic nozzle. A coaxial nozzle having an annular outlet opening is provided for injecting a fuel gas. The coaxial nozzle is designed as a subsonic nozzle and is coaxial to the primary nozzle. The primary nozzle has a convergent portion and a divergent portion, which adjoin each other at a radius of the narrowest cross-section. The annular outlet opening is located at an end face of the burner. The fuel gas, in the form of hydrogen or a mixture of hydrogen and a hydrocarbon-containing gas, is injected at a fixed inlet pressure and a fixed inlet volumetric flow rate, with respect to a planned thermal power of the burner. In contrast, the inlet pressure and the inlet volumetric flow rate of the oxygen-rich gas are varied according to the application.