Supersonic circulating combustion coherent arbon-oxygen lance of electric arc furnace and spray head structure

Abstract

The invention provides a supersonic circulating combustion coherent carbon-oxygen lance of an electric arc furnace and a spray head structure. The supersonic circulating combustion coherent carbon-oxygen lance comprises a lance barrel and a coherent spray head, wherein the lance barrel comprises a powder pipe, an oxygen pipe, a gas pipe, an inner water cooling pipe, an outer water cooling pipe, a powder inlet assembly and a sealing assembly; a center hole, a small circulating oxygen hole, a small circulating combustion hole and a combustion orientation chamber are formed in the coherent spray head; the oxygen pipe, the gas pipe and the outer water cooling pipe are respectively welded together with the coherent spray head; and the powder pipe is spliced with the coherent spray head. According to the supersonic circulating combustion coherent carbon-oxygen lance, the outer layer of powder flow is wrapped by a supersonic main oxygen jet flow, while the outer layer of the supersonic main oxygen jet flow is surrounded and accompanied by high-temperature flame, so that the attenuation of the center supersonic main oxygen jet flow becomes slow, and furthermore the main oxygen jet flow becomes long. When the supersonic circulating combustion coherent carbon-oxygen lance is applied to electric arc furnace smelting, powder spraying and oxygen blowing can be simultaneously carried out, so that the penetration depth of the main oxygen jet flow to a melting pool and the stirring strength can be improved, the distance that the main oxygen jet flow leaves away from a molten liquid surface is also increased, and furthermore the service life of the coherent spray head is prolonged.

Description

technical field [0001] The invention relates to an injection device used in electric arc furnace smelting in the metallurgical industry, in particular to an electric arc furnace supersonic ring combustion cluster carbon oxygen lance and a nozzle structure. Background technique [0002] Oxygen blowing, carbon spraying, and lime powder spraying in electric arc furnaces are newly developed iron and steel metallurgical technologies in recent years. They are important means for modern electric furnaces to strengthen oxygen use and increase chemical energy input. Because the furnace wall carbon oxygen lance integrates multiple functions such as preheating burner, cluster jet oxygen blowing decarburization, carbon powder injection to create foam slag, and secondary combustion, it can effectively reduce power consumption per ton of steel and has been widely used in the industry. [0003] In order to prolong the injection distance of mainstream oxygen and increase the stirring intens...

AI Technical Summary

Problems solved by technology

There is also a gun body structure that sprays powder through multiple main oxygen pipes, but the two generally cannot be sprayed at the same time

[0004] The supersonic airflow produced by the prior art cannot wrap the powder, so that the spraying distance of the powder is relatively short and scattered, and it is sucked away by the dust removal airflow or falls on the slag surface, and does not reach the surface of the molten steel blown away by the oxygen jet, which restricts For the development of more efficient electric arc furnace smelting process, it is necessary to study a supersonic ring combustion cluster carbon oxygen lance and nozzle structure that supports simultaneous oxygen blowing, powder spraying, and combustion heating processes

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