阅读说明：本技术 一种高炉炉料平铺调整气流分布的方法 (Method for adjusting airflow distribution by spreading blast furnace burden ) 是由 杨雷 于 2020-11-18 设计创作，主要内容包括：本发明涉及一种高炉炉料平铺调整气流分布的方法,针对使用皮带系统上料的高炉,控制槽下烧结、球团、块矿、焦丁放料顺序以及各种炉料平铺组合,以烧结矿为主要炉料,其余辅料平铺在烧结矿上面,使矿批形成一套合理的分布组合,既能保证炉料的有效平铺,又能稳定炉内煤气流分布和造渣过程,使高炉长期稳定顺行。(The invention relates to a method for adjusting air flow distribution by spreading blast furnace burden, which aims at a blast furnace using a belt system for feeding, controls the feeding sequence of sintering, pelletizing, lump ore and coke briquette under a groove and the spreading combination of various burden, takes the sintered ore as the main burden, and other auxiliary materials spread on the sintered ore, so that ore batches form a set of reasonable distribution combination, thereby not only ensuring the effective spreading of burden, but also stabilizing the coal gas flow distribution and slagging process in the furnace, and leading the blast furnace to run smoothly for a long time.)

1. A method for adjusting airflow distribution by means of blast furnace burden tiling is characterized by comprising the following steps:

1) the blast furnace using the belt system for feeding takes the sinter as the main furnace charge, and the sinter is uniformly pressurized and spread on the belt;

2) controlling the discharging time of the pellet, flatly paving the pellet on the sinter, wherein the distance between the pellet and the sintering material head is 30m, and the discharging length proportion of the pellet/the sinter is 50-60%;

3) controlling the discharging time of the lump ore, paving the lump ore on the sinter ore, wherein the distance between the lump ore and the sinter stub is 45m, and the discharging length proportion of the lump ore/the sinter ore is 50-60%;

4) controlling the discharging time of the coke, wherein the distance between the coke and the sintering material head is 20m, and the discharging length proportion of the coke/sintering ore is 30-40%;

5) in the ore batch, when the proportion of the sintered ore, the pellet ore or the lump ore changes, the change of the discharge length of the sintered ore, the pellet ore and the lump ore is noticed in time, and when the tiling proportion of the pellet ore and the lump ore exceeds the range, the opening degree of a discharge gate of a groove is adjusted in time, so that the tiling proportion is restored to the required proportion;

6) when the weight of the coke dices changes, the discharge speed of the coke dices is adjusted in time to ensure that the spreading proportion is in a specified range.

Technical Field

The invention belongs to the technical field of blast furnace belt feeding, and particularly relates to a method for adjusting airflow distribution by tiling blast furnace burden.

Background

The raw fuel required in the normal production process of the blast furnace mainly comprises the following components: the method comprises the following steps of sintering ore, pellet ore, lump ore, coke and coke breeze, wherein the coke is called a coke batch of one batch and is independently fed into a furnace, and the rest of the sintering ore, the pellet ore, the lump ore and the coke breeze are combined together and called an ore batch and are distributed into a blast furnace together. In the prior production process, the control mode that four raw materials of an ore batch enter a furnace is relatively extensive in management, the proportions of different components in the ore batch change or the difference between shifts is large, and the distribution of gas flow in a blast furnace is influenced.

Disclosure of Invention

The invention aims to provide a method for adjusting airflow distribution by spreading blast furnace burden.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for adjusting airflow distribution by means of blast furnace burden tiling comprises the following steps:

1) the blast furnace using the belt system for feeding takes the sinter as the main furnace charge, and the sinter is uniformly pressurized and spread on the belt;

2) controlling the discharging time of the pellet, flatly paving the pellet on the sinter, wherein the distance between the pellet and the sintering material head is 30m, and the discharging length proportion of the pellet/the sinter is 50-60%;

3) controlling the discharging time of the lump ore, paving the lump ore on the sinter ore, wherein the distance between the lump ore and the sinter stub is 45m, and the discharging length proportion of the lump ore/the sinter ore is 50-60%;

4) controlling the discharging time of the coke, wherein the distance between the coke and the sintering material head is 20m, and the discharging length proportion of the coke/sintering ore is 30-40%;

5) in the ore batch, when the proportion of the sintered ore, the pellet ore or the lump ore changes, the change of the discharge length of the sintered ore, the pellet ore and the lump ore is noticed in time, and when the tiling proportion of the pellet ore and the lump ore exceeds the range, the opening degree of a discharge gate of a groove is adjusted in time, so that the tiling proportion is restored to the required proportion;

6) when the weight of the coke dices changes, the discharge speed of the coke dices is adjusted in time to ensure that the spreading proportion is in a specified range.

The invention has the following beneficial effects:

the invention aims at the blast furnace using a belt system for feeding, controls the discharging sequence of sintering, pelletizing, lump ore and coke briquette under a groove and the tiling combination of various furnace charges, takes the sintered ore as the main furnace charge, and other auxiliary materials are tiled on the sintered ore, so that ore batches form a set of reasonable distribution combination, thereby not only ensuring the effective tiling of the furnace charge, but also stabilizing the gas flow distribution and slagging process in the furnace and leading the blast furnace to run smoothly for a long time.

Detailed Description

The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.

The domestic blast furnace is mainly characterized in that alkaline sinter ore (60-90%), acidic pellet ore and lump ore (10-40%) are comprehensively formed into charging materials with a certain proportion, and a part of coke dices with the diameter of 12-25mm are added for improving the air permeability of the ore.

Sintered ore is taken as main furnace charge, and the sintered ore is flatly paved on a belt in a pressure-sharing manner, for example, the discharge length of the sintered ore of a certain domestic blast furnace is 300 m.

The discharging time of the pellet is controlled in the discharging procedure, the distance between the pellet and the sintering material head is 30m, the discharging length of the pellet is kept between 150 and 180m, and the proportion of the pellet to the sintered ore is 50-60%.

The discharging time of the pellet is controlled in the discharging procedure, the distance between the lump ore and the sintering material head is 45m, the discharging length of the lump ore is kept between 150 and 180m, namely the proportion of the lump ore/the sintering ore is 50-60%.

And controlling the discharging time of the pellets in a discharging procedure, wherein the distance between the coke and the sintering material head is 20m, and the discharging length of the coke is kept between 90 and 120m, namely the ratio of the coke to the sintered ore is 30 to 40 percent.

In the ore batch, when the proportion of sintering, pellets or lump ore changes, the change of the discharging length of the sintering, pellets and lump ore is paid attention to in time, and when the tiling proportion of the pellets and the lump ore exceeds the range, the opening degree of the discharging gate of the groove is adjusted in time, so that the tiling proportion is restored to the required proportion.

When the weight of the coke dices changes, the discharge speed of the coke dices is adjusted in time to ensure that the spreading proportion is in a specified range.