Basic research on the coherent jet with hydrogen as the surrounding gas

ABSTRACT Due to its excellent metallurgical properties, Coherent Jet Oxygen Lance gradually replaces the traditional supersonic oxygen lance. This study is based on the traditional coherent jet oxygen lance that uses natural gas as the ring combustion gas and uses hydrogen as the gas to replace it. Numerical simulation is used to explore the basic characteristics and laws of hydrogen–oxygen coherent jet injection. Based on the fluid theory, the geometric parameters of the hydrogen–oxygen coherent jet oxygen lance are obtained through strict mathematical derivation. A systematic study of the mixture of hydrogen and natural gas as fuel gas was carried out, and the results were analysed in detail. This study is the first to clarify the application mechanism of hydrogen as a gas in the coherent jet oxygen lance, provide a reference for the injection parameters of EAFand expand the research direction of hydrogen energy in the field of steelmaking.