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Coke powder pretreatment process for sintering and iron ore sintering process and system

A technology for pretreatment and coke powder is applied in the field of new sintering process and system, coke powder pretreatment process, and new sintering process and system using pretreated coke powder, which can solve the problem of high investment cost, low investment cost and increased investment cost. And other issues

Active Publication Date: 2020-08-18
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is a single-tower design or a double-tower design, the removal rate of sulfur dioxide can reach 95%, but for nitrogen oxides, the denitrification rate of the single-tower design is less than 60%, although the denitrification rate of the double-tower design can be further improved to more than 85%, but the investment cost has also increased significantly
For the sintering plant that is currently planning to build an activated carbon flue gas purification device, it faces the problem of low investment cost of the single-tower design but the purification of flue gas NO x The emission concentration is still higher than 100mg / m 3 And double-tower design after purification flue gas NO x Difficult situation that the emission concentration can reach the standard but the investment cost is high

Method used

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  • Coke powder pretreatment process for sintering and iron ore sintering process and system
  • Coke powder pretreatment process for sintering and iron ore sintering process and system
  • Coke powder pretreatment process for sintering and iron ore sintering process and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Such as figure 1 As shown, a pretreatment process for coke powder for sintering includes the following steps:

[0097] 1) Transport the quicklime to the first-stage cylinder 1, and spray water into the first-stage cylinder 1. The quicklime is digested in the first-stage cylinder 1 to obtain lime milk;

[0098] 2) The lime milk obtained in step 1) is transported to the second-stage cylinder 2, while the coke powder and iron concentrate are transported to the second-stage cylinder 2. The lime milk, coke powder, and iron concentrate pass through the second stage cylinder 2. It is mixed in the stage cylinder 2 to form a fuel structure with coke powder as the core, lime milk slurry, and iron fine powder coating.

[0099] Among them: in step 1): the weight ratio of quicklime to water is 1:1.5; in step 2): the weight ratio of lime milk and iron powder is 1:0.5, the weight sum of the mixture of iron powder and lime milk and coke The ratio of powder mass is 1:1.

[0100] In step 1): th...

Embodiment 2

[0102] Example 1 is repeated, except that the first rotating shaft 101 is provided in the first-stage cylinder 1. Blades are provided on the first rotating shaft 101. The first rotating shaft 101 rotates in a clockwise direction. The quicklime and water are stirred and mixed by the blade on the first rotating shaft 101. The quicklime and water are digested and mixed in the first-stage cylinder 1 while being transported to the direction of the discharge port of the first-stage cylinder 1.

[0103] In step 2), the second-stage cylinder 2 is set directly below the first-stage cylinder 1. The conveying direction of the first-stage cylinder 1 is opposite to the conveying direction of the second-stage cylinder 2. The lime milk obtained through the digestion of the first stage cylinder 1 enters the second stage cylinder 2. A second rotating shaft 201 is provided in the second-stage cylinder 2. Blades are provided on the second rotating shaft 201. The second rotating shaft 201 rota...

Embodiment 3

[0105] Repeat Embodiment 2 except that the second rotating shaft 201 is eccentrically arranged. The cylinder 202 of the second-stage cylinder 2 has a rotating structure. The rotation direction of the second-stage cylinder 2 is opposite to the direction of the second rotation shaft 201. The milk of lime, coke powder, and fine iron powder are subjected to the shearing force of the barrel 202 of the second-stage cylinder and the second rotating shaft 201 in the opposite direction in the second-stage cylinder 2, forming convection, mixing, and mixing the iron fine powder And lime milk wrapped on the surface of coke powder. The ratio of the rotation speed of the second rotating shaft 201 to the rotation speed of the cylinder 202 is 9:1.

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Abstract

The invention provides a pretreatment process of coke powder for sintering, which comprises the following steps: 1) conveying quick lime into a first-stage cylinder, spraying water into the first-stage cylinder, and digesting the quick lime in the first-stage cylinder to obtain lime milk; and 2) conveying the lime milk obtained in the step 1) into a second-stage cylinder, conveying the coke powderand the fine iron powder into the second-stage cylinder at the same time, and mixing the lime milk, the coke powder and the fine iron powder in the second-stage cylinder to form a fuel structure which takes the coke powder as a core and is coated with lime milk slurry and the fine iron powder. The combustion environment of the solid fuel in the sintering process of the coke powder is improved; sothat on one hand, the oxygen potential in a peripheral gas film during combustion of the coke powder is reduced, and an N element in the fuel is inhibited from being oxidized into NOx; and on the other hand, a calcium ferrite substance is rapidly formed on the surface of the coke powder, and generated NOx is promoted to be reversely reduced into N2.

Description

Technical field [0001] The invention relates to a coke powder pretreatment process for sintering, a new sintering process and system, and in particular to a low-NO x A combustion coke powder pretreatment process, a new sintering process and system using pretreatment coke powder, belong to the field of sintering. Background technique [0002] The sintering process is the main process of my country's steel smelting charge processing due to its advantages such as large production scale, strong resource adaptability, and low production cost. The sintering process is also a concentrated link of high energy consumption and high pollution in the steel smelting process. The exhaust gas discharged accounts for about half of the total exhaust gas of the iron and steel industry. x , NO x The discharge of pollutants such as POPs and POPs ranks first in the steel industry. With the promulgation and implementation of laws, regulations and related policies such as the "Air Pollution Prevention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/00C10L5/04C10L5/40C22B1/16C22B1/243
CPCC10L5/00C10L5/04C10L5/40C22B1/16C22B1/243Y02E50/30
Inventor 王兆才周志安胡兵刘克俭李康
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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