Soaking sintering method based on layered composite heat supply

Abstract

The invention relates to a soaking sintering method based on layered composite heat supply. The soaking sintering method based on layered composite heat supply comprises the following steps that 1), proportioning is carried out on an iron-containing raw material, a flux, a solid fuel and water, and the proportioned sintering mixture is distributed onto a sintering machine trolley; 2) the sintering mixture distributed to the sintering machine trolley is ignited, and the fact of sintering the surface-layer sintering mixture in the sintering machine trolley is started; 3) high-temperature gas is injected to the material surface of the sintering mixture after ignition, and the high-temperature gas supplies heat to the middle-upper layer sintering mixture; (4) after heat preservation and heat supply, combustible gas is injected to the material surface of the sintering mixture, and the combustible gas is combusted in the material layer to supply heat to the middle-layer sintering mixture; and (5) after gas injection, steam is injected to the material surface of the sintering mixture, and the steam accumulates heat to supply heat to the lower-layer sintering mixture. By adopting the method, the problems of insufficient heat of an upper material layer and excessive heat of a lower material layer in traditional sintering can be effectively solved, and green soaking low-carbon sintering is realized.

Description

technical field

[0001] The invention relates to a sintering production process, in particular to a soaking sintering method based on layered composite heat supply, which belongs to the technical field of sintering. 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. 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 high pollution industry. Its energy consumption ranks second in the iron and steel industry, and its ...

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