A tangential curtain cooling gas injection sintering machine and its control method

Abstract

The invention discloses a tangential curtain cooling type gas injection sintering machine and its control method. The sintering machine includes a sintering machine track, a sintering machine trolley, an ignition device, and a gas injection device. The device is installed at the gas injection position of the sintering machine to inject gas to the sintering material surface of the sintering machine trolley when the sintering machine trolley passes by its position; further comprising a steam injection device, the steam The injection device is arranged at a position between the ignition device and the gas injection device, so that when the sintering machine trolley passes by the position where it is located, the sintering material of the sintering machine trolley is injected into the sintering machine trolley in the form of a steam curtain Steam is injected on the surface to reduce the temperature of the sintered material surface to below the ignition temperature of the gas. The sintering machine is equipped with a steam injection device, which can effectively solve the problems of easy ignition and unstable production of the gas injection device.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a gas injection sintering machine with a tangential curtain cooling function used in the production process of sintered ore. The present invention also relates to a method for controlling the gas injection sintering machine. Background technique [0002] The sintering process is a key link in the ironmaking process. The principle is to mix various powdered iron-containing raw materials with appropriate amount of fuel and flux, add an appropriate amount of water, and then mix and pelletize the materials on the sintering equipment. A series of physical and chemical changes, sintered into a block, and then sent to the blast furnace for the next step. [0003] Sintering is the main raw material processing technology for iron and steel smelting in my country, and more than 75% of blast furnace raw materials come from sinter. But sintering is a typical high energy consumption and ...

AI Technical Summary

Problems solved by technology

[0006] 1) If the starting point of gas injection is set too early, it is easy to catch fire on the material surface

[0007] If the starting point of gas injection is set too close to the head of the sintering machine, the red hot material surface just out of the ignition furnace will easily ignite the injected gas, so that not only the gas will not strengthen the sintering effect, but also it will easily burn the inner tube of the hood Row facilities, affecting normal production

[0008] 2) If the starting point of gas injection is set, the enhanced sintering effect will not be obvious

[0009] If the starting point of gas injection is set, the ignition phenomenon can be effectively suppressed. However, since the sintering machine is produced by draft operation, the upper material layer does not have the effect of hot air heat storage, which is the area most in need of supplementary heat.

However, if the gas is injected too late, the combustion zone has already moved down to the middle of the material layer, and the upper material layer cannot be supplemented by gas, so that the overall gas injection enhanced sintering effect is not obvious, and even defective sintered ore may appear. rising rate phenomenon

[0010] To sum up, the current gas injection technology has key problems to be solved in the selection of the injection starting point

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