Soaking sintering method based on layered composite heat supply

A thermal sintering and sintering machine technology, applied in the field of sintering, can solve problems such as uneven temperature distribution in the combustion zone, narrow combustion zone, and adverse effects on the overall quality of sintering ore

Active Publication Date: 2021-04-30
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coke burning method inside the material layer is not conducive to the occurrence and development of the coke combustion process, so that in the actual sintering process, the combustion zone ...

Method used

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  • Soaking sintering method based on layered composite heat supply
  • Soaking sintering method based on layered composite heat supply
  • Soaking sintering method based on layered composite heat supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0136] According to the first embodiment of the present invention, a soaking sintering method based on layered composite heat supply is provided.

[0137] A soaking sintering method based on layered composite heat supply. The sintering mixture is sintered in the sintering machine. Along the direction of the depth of the sintering machine trolley 1, the sintering mixture is divided into multiple hierarchical units. Distribute heat supply ratio for heat supply sintering.

[0138] In the present invention, along the direction of the depth of the sintering machine trolley 1, the sintering mixture is divided into four hierarchical units, which are divided into four units from top to bottom: surface layer, upper middle layer, middle layer and lower layer. The percentage of heat supplied by the surface sintering mixture to the total heat required by the sintering mixture in the sintering process is a1; The percentage of the heat supplied by the sintering mixture to the total heat re...

Embodiment 1

[0205] Such as Figure 4 Shown, a kind of soaking sintering method based on layered compound heat supply, this method comprises the following steps:

[0206] 1) Mixing and distributing: mix the iron-containing raw materials, flux and solid fuel, and distribute the prepared sintering mixture on the sintering machine trolley 1;

[0207] 2) Ignition and sintering: an ignition device 6 is provided directly above the sintering machine trolley 1 located upstream of the sintering machine; The surface sintering mixture L1 starts to sinter; the surface sintering mixture L1 in the sintering machine trolley 1 is heated by the ignition device 6, and the solid fuel in the sintering mixture provides heat for sintering; The lower air box draws the air above the sintering mixture on the trolley into the bellows, so that the sintering mixture in the sintering machine trolley 1 is sintered from the surface layer of the trolley to the lower layer of the trolley;

[0208] 3) Thermal insulation ...

Embodiment 2

[0214] Repeat Example 1, except that in step 1), the mass ratio of the solid fuel to the total amount of sintered mixture is 1.5%.

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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 ...

Claims

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Application Information

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IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 叶恒棣周浩宇魏进超刘克俭王兆才陈思墨刘前李谦
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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