Initial section injection method of injection process of sintering machine

Abstract

The invention discloses an initial section injection method of an injection process of a sintering machine. The method comprises the following steps that materials enter a heat preservation section for heat preservation after being ignited by an ignition furnace device; after heat preservation, the materials are conveyed to a fuel gas injection unit for injecting fuel gas, the starting point of the injection initial section of the fuel gas injection unit is 4-5 min of sintering, and the end point of the fuel gas injection initial section is 5-7.5 min of sintering; the materials pass through the fuel gas injection unit and then enter a fuel gas steam coupling unit, the starting point of a steam injection initial section of the fuel gas steam coupling injection unit is the 8-9 min of sintering, and the end point of the steam injection initial section is the 9-11 min of sintering; and the gas concentration of the gas injection initial section adopts an incremental gradient ratio, and the steam concentration of the steam injection initial section adopts an incremental gradient ratio. The fuel gas injection initial section is within the range, the arrangement is reasonable, the ignition phenomenon is avoided, and the sintering effect is enhanced. The steam injection initial section is within the range, so that the air permeability of a material layer can be improved, the burnup can be reduced, and a formed combustion zone is not easy to extinguish.

Description

technical field [0001] The invention relates to the technical field of sintering, in particular to an injection method at the initial stage of a sintering machine injection process. Background technique [0002] 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. [0003] At present, the head of the sintering machine is equipped with an ignition furnace, and an ignition burner is installed in the ignition furnace. The sintering machine trolley is connected end to end and installed on the sintering machine. orbit. A bottom bellows is installed under the track of the sintering machine, the upper part of the bellows corresponds to the bottom of the trolley, and the lower part of the bellows is connected to the large sintering flue. The sintering of this device mainly utilizes pulverized coal combustion to generate a large amount of heat, resulting in high ...

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Problems solved by technology

[0007] However, for the initial stage of gas injection, the effect is better if the starting point of gas injection is moved forward, but if the starting point of gas injection is set too far, it is easy to catch fire; for the initial stage of steam injection, moving the starting point of steam injection forward can improve the Layer breathability and reduce fuel consumption, but the steam injection starting point is set too early, which will easily cause the newly formed combustion zone to go out

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