CN112226559A

CN112226559A - Method for central coking cloth

Info

Publication number: CN112226559A
Application number: CN202011126468.7A
Authority: CN
Inventors: 周洋; 丁洪海; 韩廷全; 张廷明; 高维平; 王志刚
Original assignee: Bengang Steel Plates Co Ltd
Current assignee: Bengang Steel Plates Co Ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-01-15

Abstract

The invention discloses a method for distributing material by central coke charging, which comprises the steps of opening a lower sealing valve and a blanking gate to start distributing material after distributing the secondary central coke amount, closing the blanking gate to stop distributing material into a furnace, continuously tilting a chute, opening the blanking gate to the maximum value to continue distributing material after the chute reaches a pure center and sets a distributing angle until the coke amount in a weighing tank is completely distributed into the furnace, and finishing distributing material. The invention can greatly reduce the coke distribution amount in a non-ore area, reduce the width of the central coke platform and increase the pure central coke amount ratio. The coal gas utilization rate is improved due to the increase of the coke amount in the ore-free area; because the pure central coke amount is increased and the central permeability is enhanced, the combination of the pure central coke amount and the central permeability has great significance for reducing fuel consumption and stabilizing the smooth operation of the blast furnace, especially when the unstable quality of the raw fuel is changed.

Description

Method for central coking cloth

Technical Field

The invention relates to the technical field of metallurgy, in particular to a coking and distributing method of a blast furnace.

Background

In steel production enterprises, cost reduction is particularly important. The pig iron cost accounts for more than 60 percent of the total cost of steel products, and in order to ensure stable increase of economic benefit, the blast furnace needs to reduce the coke-to-coke ratio fuel ratio while ensuring the pig iron output, so as to achieve the purposes of reducing the pig iron cost and increasing the efficiency for enterprises. The center coke-adding material distribution is mainly applied to blast furnace iron-making production, namely, a small amount of coke is additionally added to the center of a blast furnace by utilizing furnace top charging equipment to reduce the ore-coke ratio in a narrow range of the center of the blast furnace, improve the central air permeability, enable more coal gas to flow through, ensure the formation of an inverted V-shaped soft melting zone and ensure the long-term stable smooth operation of the blast furnace. The existing central coking technology is not beneficial to reducing fuel consumption because the central coking amount is relatively large, the platform is too wide, and the coal gas utilization rate is low.

Disclosure of Invention

The invention aims to find out the main reason of excessive central coke amount by analyzing the use working condition and principle of a central coke adding and distributing mode, which is as follows: the original central coke feeding and distributing mode has defects in the furnace top distributing process.

Aiming at the technical problems, the technical scheme of the invention is as follows:

a method for distributing material by central coke charging comprises the steps of opening a lower sealing valve and a blanking gate to start distributing material after distributing the secondary central coke amount, closing the blanking gate to stop distributing material into a furnace, continuously tilting a chute, opening the blanking gate to the maximum value to continue distributing material after the chute reaches a pure center to set a distributing angle, and finishing distributing material until the coke amount in a weighing tank is completely distributed into the furnace.

When the angle between the chute and the secondary center is 1 degree, the blanking gate is closed, the weight of coke in the weighing tank is kept unchanged in the process that the chute tilts from the secondary center to the pure center, the coke is not distributed into the furnace any more, after the chute tilts to be larger than the set angle of the pure center by 1 degree, the blanking gate is opened and is opened to the maximum, and the residual coke is completely distributed in the center of the blast furnace in a short time.

The method of the invention can also be applied to furnace roof mine distribution.

The invention has the advantages that:

a. the change of the original central coking distribution technology reduces the coke amount of the whole ore-free area on the basis of increasing the coke amount of the pure center, increases the air permeability of the middle ore belt and reduces the fuel consumption.

b. Because the pure central coke amount is greatly increased, the renewal speed of the central coke bed of the hearth is accelerated, the hearth is active, and the air permeability and the liquid permeability are enhanced, thereby achieving the purposes of long service life, low consumption and high yield of the blast furnace.

Drawings

Fig. 1 is a schematic diagram of the present invention.

FIG. 2 is a screenshot of a control interface of a center-focusing material distribution method before improvement;

FIG. 3 is a screenshot of an improved center-focused material distribution method control interface.

Detailed Description

The invention is described in detail with reference to the accompanying drawings, as shown in the drawings, when the distribution condition is met, the sealing valve and the blanking gate are opened to start distribution, the distribution matrix is set, after the sub-center coke amount is distributed, the blanking gate is closed, the distribution is not carried out in the furnace, the chute continues to tilt, after the chute reaches the pure center set distribution angle, the blanking gate is opened to the maximum to continue distribution until the coke amount in the weighing tank is completely distributed in the furnace, and the distribution is finished.

The method of the invention enhances the controllability in the material distribution process. The mode of coke feeding and distributing is consistent with that of the original center in the earlier stage, when the coke amount of a non-ore area is distributed, when the coke amount is set to be 1 degree from the secondary center, the blanking gate is closed, the chute tilts from the secondary center to the pure center, the coke weight in the weighing tank keeps unchanged, the coke is not distributed into the furnace any more, after the chute tilts to be larger than the pure center to set the angle to be 1 degree, the blanking gate is opened and is opened to the maximum, and the residual coke is distributed in the center of the blast furnace in a short time. The improved distributing method cancels the coke amount of the chute in the process of tilting from the secondary center to the pure center, can greatly reduce the coke distributing amount in a non-ore area, reduces the width of a central coke platform and increases the proportion of the coke amount in the pure center. The coal gas utilization rate is improved due to the increase of the coke amount in the ore-free area; because the pure central coke amount is increased and the central permeability is enhanced, the combination of the pure central coke amount and the central permeability has great significance for reducing fuel consumption and stabilizing the smooth operation of the blast furnace, especially when the unstable quality of the raw fuel is changed.

The same total coke distribution amount adopts the method of the prior art, the coke amount of a non-ore area is 6.0 tons, and the coke amount of a pure center is 3.49 tons; by adopting the method, the coke amount in the non-ore area is 5.47 tons, and the coke amount in the pure center is 4.37 tons.

The key point of the invention is that the 'position of a blanking gate switch' is set and controlled according to a cloth matrix in the cloth process. The method can be applied to all center coke feeding and distributing methods, and the specific position of a blanking gate switch is determined according to the actual situation.

The invention can greatly reduce the coke amount in the ore-free area according to the specific furnace condition on the basis of increasing the pure central coke amount, and has great significance for ensuring the long-term stable smooth operation of the blast furnace and reducing the fuel consumption.

The method of the invention can also be widely applied to a furnace top ore distribution method.

Claims

1. A method for central coking cloth is characterized in that: and after the distribution condition is met, opening the lower sealing valve and the blanking gate to start distribution, after the secondary central coke amount is distributed, closing the blanking gate, no longer distributing the coke in the furnace, continuously tilting the chute, after the chute reaches the pure center and sets a distribution angle, opening the blanking gate to the maximum, continuously distributing the coke until the coke amount in the weighing tank is completely distributed in the furnace, and finishing distribution.

2. The method of center-charring a fabric as claimed in claim 1, wherein: when the angle between the chute and the secondary center is 1 degree, the blanking gate is closed, the weight of coke in the weighing tank is kept unchanged in the process that the chute tilts from the secondary center to the pure center, the coke is not distributed into the furnace any more, after the chute tilts to be larger than the set angle of the pure center by 1 degree, the blanking gate is opened and is opened to the maximum, and the residual coke is completely distributed in the center of the blast furnace in a short time.

3. The method of center-charring a fabric as claimed in claim 1, wherein: the method is applied to furnace top ore distribution.