Blast furnace for iron smelting

Abstract

The invention relates to the technical field of iron smelting, and discloses a blast furnace for iron smelting. The blast furnace comprises a furnace wall, a hot air pipeline is fixedly mounted at thebottom end of the inner side of the furnace wall, an air cavity pipe is fixedly mounted at the top end of the hot air pipeline, and a circulating water pipe is fixedly mounted at the top end of the air cavity pipe. An air supply pipe and the circulating water pipe are additionally arranged on the hot air pipeline, high-pressure oxygen airflow is conveyed through the air supply pipe, an air wall is formed, primary blocking protection is conducted on the hot air pipeline, furnace burden and furnace slag are prevented from falling off and thermally corroding a pipe body, secondary cooling protection is conducted through cold water flow in the circulating water pipe, and high-temperature falling objects are cooled so that it can be ensured that the thermal corrosion degree is substantially reduced; and by arranging a water partition plate and an air partition plate, the circulating water pipe and the air cavity pipe are divided into four areas, heat contained in water flow circulation andheat emitted by the pipe body are used for conducting heat conduction and heating on oxygen flow, oxygen is added to jetted hot air coal gas, the oxidation reaction of a material column is promoted,and combustion supporting is facilitated.

Description

technical field [0001] The invention relates to the technical field of iron making and smelting, in particular to a blast furnace for iron smelting. Background technique [0002] Iron smelting is the process of smelting iron ore into metallic iron at high temperature. The main process of modern iron smelting is carried out in the blast furnace, which is a vertical cylindrical furnace made of refractory materials. The furnace shell is made of steel plates on the outside, and the inside of the shell is reinforced with fireproof wall bricks and sealed to form a furnace wall. The furnace body is divided into five parts: the furnace throat, the furnace body, the furnace waist, the furnace belly and the furnace hearth from top to bottom. , wherein, an annular hot air pipe is provided between the bosh and the furnace hearth, and a hot air nozzle is provided at the end of the annular hot air pipe. The hot air nozzle is cylindrical in shape and embedded in the furnace wall, and its f...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the use of the existing blast furnace proposed in the background technology, the present invention provides a blast furnace for iron smelting, which has a double-layer structure protection to prevent the furnace material and slag from falling and corroding the tube body, and at the same time has a low temperature preheating furnace. Heat-assisted oxygen makes the gas rich in oxygen and has the advantage of combustion-supporting effect, which solves the technical problems raised in the above-mentioned background technology

Images