Annular tooth seam supersonic jetting nozzle

Abstract

The invention discloses an annular tooth seam supersonic jetting nozzle. An annular pipe airflow channel is composed of a hollow core pipe and an outer pipe with the variable cross-section and provided with a contraction acceleration segment with the annular cross section and an expanding acceleration segment with the annular cross section. A transition segment of an annular tooth cross section is connected with the contraction segment and the expanding segment, gas of the certain pressure and flow can be accelerated to be at supersonic speed, and supersonic jet is formed at an outlet of the nozzle. When the annular tooth seam supersonic jetting nozzle is applied to an RH vacuum refining furnace top gun, oxygen blowing decarbonization, oxygen blowing temperature increasing and powder spraying desulfuration can be achieved for molten steel inside a vacuum chamber on the vacuum condition, and gas is blown to the vacuum chamber on the non-vacuum condition for baking and heating to remove cold steel; when the annular tooth seam supersonic jetting nozzle is applied to an electric furnace wall gun, supersonic airflow can cut scraped steel and spray carbon powder to form foaming slags; when the annular tooth seam supersonic jetting nozzle is applied to a blast furnace, long-distance pulverized coal spraying can be achieved. When the annular tooth seam supersonic jetting nozzle is applied to an industrial heating furnace, high-power super-long flame heating can be achieved; when the annular tooth seam supersonic jetting nozzle is applied to a steam jetting vacuum pump, high-flow air exhaust can be achieved.

Description

technical field [0001] The invention relates to a jetting device used for generating supersonic airflow in the metallurgical industry, in particular to a supersonic jet jet nozzle with ring tooth gaps. Background technique [0002] Supersonic jets are widely used in the metallurgical industry, such as oxygen lances in top-blown converters, top lances in RH vacuum refining, etc. 但无论是RH-KTB顶枪,还是以后开发的RH-MFB顶枪、RH-MESID顶枪、RH-PB顶枪以及中国专利200420027046.4、200610076151.0、200820174977.5、200820174973.7、200820174973.7、201110000083.0、201210346652.1、201310431081.6所涉及 The top gun or nozzle of the top gun adopts a round-hole Laval tube structure, that is, the Laval tube is generally at the center, the gas channels are distributed outside the Laval tube, and the gas channels of individual gun heads are at the center, while the Laval tube adopts a porous external Inclined distribution, all have disadvantages such as difficult manufacturing, low service life, limited flow rate of oxygen blowing, a...

AI Technical Summary

Problems solved by technology

但无论是RH-KTB顶枪,还是以后开发的RH-MFB顶枪、RH-MESID顶枪、RH-PB顶枪以及中国专利200420027046.4、200610076151.0、200820174977.5、200820174973.7、200820174973.7、201110000083.0、201210346652.1、201310431081.6所涉及 The top gun or nozzle of the top gun adopts a round-hole Laval tube structure, that is, the Laval tube is generally at the center, the gas channels are distributed outside the Laval tube, and the gas channels of individual gun heads are at the center, while the Laval tube adopts a porous external Inclined distribution, all have disadvantages such as difficult manufacturing, low service life, limited flow rate of oxygen blowing, easy to block the gun during use, etc.

Chinese patent 20142044449.6 proposes annular nozzle technology, which solves the above problems, but there is a problem that the expansion of the nozzle material after heating affects the area of ​​the annular seam and thus affects the injection flow rate

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