Oxygen blowing air port of smelting reduction iron-making furnace

Abstract

The invention discloses an oxygen blowing air port of a smelting reduction iron-making furnace, i.e. a straight oxygen blowing pipe is arranged in the center of a conical outer shell; a vertical division board divides the conical outer shell into a front cavity and a rear cavity; a circular division board which is arranged in the front cavity divides the front cavity into an inner cavity and an outer cavity which are communicated; the end surface of the front cavity is provided with a concave opening around the center of the straight oxygen blowing pipe; the water inlet of the rear cavity, the water outlet of the rear cavity, the water inlet pipe of the front cavity and the water outlet pipe of the front cavity are arranged on the end surface of the rear cavity and are respectively communicated with the rear cavity, the inner cavity and the outer cavity; the air inlet pipe is arranged on the end surface of the rear cavity and is arranged in the rear cavity; a circular sleeve is sleeved on the outer wall of the middle part of the straight oxygen blowing pipe, and a cavity exists between the circular sleeve and the outer wall of the middle part of the straight oxygen blowing pipe; both ends of the cavity are sealed; one end of the air inlet pipe which is arranged in the rear cavity is communicated with the cavity; the pipe wall on the front section of the straight oxygen blowingpipe is provided with a plurality of through holes at intervals along an axial direction; and the through holes are communicated with the cavity and the concave opening. The oxygen blowing air port effectively prolongs the service life, moves a burning area outside the concave opening, simultaneously effectively improves the oxygen jetting speed, greatly reduces the fault rate of a COREX furnace,and ensures the normal operation of the COREX furnace.

Description

technical field [0001] The invention relates to an oxygen blowing tuyere of a smelting reduction ironmaking furnace. Background technique [0002] Smelting reduction ironmaking furnace is referred to as COREX furnace. Smelting reduction ironmaking is a non-blast furnace ironmaking process. COREX furnace has the advantages of short process and low pollution. It is a revolution to the traditional blast furnace ironmaking technology. This technology is a cutting-edge high-tech in the world's iron and steel industry. It is a new process for producing hot metal with coal and ore. It does not use coking coal and can avoid the sharp increase in the cost of blast furnace ironmaking caused by the increasingly scarce coking coal resources. It is also environmentally friendly. It has obvious advantages, is a clean production process, and can carry out comprehensive recycling of energy. The COREX furnace uses pure oxygen blast, uses lump coal as fuel, and the temperature inside the fur...

AI Technical Summary

Problems solved by technology

However, this structural improvement is difficult to avoid the burning of the spoiler shield at the front end of the oxygen blowing tuyere under the action of high temperature and air flow. The diameter of the front port of the spoiler shield after burning becomes larger, which reduces the protection of the main oxygen jet of the oxygen blowing tuyere. , affecting the delivery of oxygen, and at the same time, increasing the infiltration of the swirling gas in the furnace into the inner area of ​​the turbulence shield, further causing damage to the oxygen blowing tuyeres

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