Steam cooling type fuel gas injection sintering machine and control method thereof

Abstract

The invention discloses a steam cooling type fuel gas injection sintering machine and a control method thereof. The steam cooling type fuel gas injection sintering machine comprises a sintering machine rail (6), a sintering machine trolley (3), an ignition device and a fuel gas injection device, and the fuel gas injection device is arranged at a fuel gas injection position of the sintering machineso as to inject fuel gas to a sintering material surface of the sintering machine trolley (3) when the sintering machine trolley (3) passes through the fuel gas injection position; the sintering machine further comprises a steam cooling device (9), wherein the steam cooling device (9) is arranged at the position between the ignition device and the fuel gas injection device so as to blow steam tothe sintering material surface of the sintering machine trolley (3) when the sintering machine trolley (3) passes through the position where the sintering machine trolley (3) is located, so that the temperature of the sintering material surface is reduced to be lower than the fuel gas ignition temperature. The sintering machine is provided with the steam cooling device, and the problems that a fuel gas injection device is prone to catching fire, unstable in production and the like can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a gas injection sintering machine with steam cooling function used in the production process of sintered ore. The invention also relates to a method for controlling said gas injection sintering machine. Background technique [0002] The sintering process is a key link in the ironmaking process. Its principle is to mix various powdery iron-containing raw materials with an appropriate amount of fuel and flux, add an appropriate amount of water, mix and pelletize the material on the sintering equipment to make the material A series of physical and chemical changes, sintered into blocks, which are 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 sintering ore. But sintering is a typical high energy consumption and hig...

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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