Control method and device suitable for foamed slag furnace condition in iron bath smelting reduction

A control method, iron bath melting technology, applied in the field of ironmaking, can solve problems such as inapplicable iron bath melting reduction process

Active Publication Date: 2020-12-08
SHANDONG MOLONG PETROLEUM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the blast furnace has formed a relatively standardized quantitative recovery method for abnormal furnace conditions, but due to different pr

Method used

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  • Control method and device suitable for foamed slag furnace condition in iron bath smelting reduction
  • Control method and device suitable for foamed slag furnace condition in iron bath smelting reduction
  • Control method and device suitable for foamed slag furnace condition in iron bath smelting reduction

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Experimental program
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Effect test

Embodiment 1

[0137] The quantitative recovery method of the iron bath smelting reduction of the present application comprises wind mode (OW mode), simmering furnace mode (Idle mode), maintenance mode (Hold mode), climbing mode (OR-1 mode), production mode (OR-1 mode). 2 mode)

[0138] The characteristics of the five productions are as follows:

[0139] 1) OW mode: refers to temporarily stopping the air supply to the SRV furnace for some reason, and the SRV furnace is quickly switched from the production status to the maintenance and safety standby stage in a short period of time, and HAF=0Nm at this stage 3 / h, Ore-I=0, Coal-I=0, Lime-I=0, the gas release valve of the smelting reduction furnace is opened, and the SP is gradually reduced to 0, as figure 1 shown.

[0140] 2) Idle mode: refers to the injection of oxygen-enriched hot air and natural gas into the smelting reduction furnace after re-airing to establish heat balance and provide the heat required for the start-up of the smelting...

Embodiment 2

[0145] The foamy slag is produced in the iron bath smelting reduction process. C in the pulverized coal injected into the molten pool is dissolved in the iron bath and enters the molten iron. Bubbles formed by mixing. The foamy slag presents a fine film-like structure. During normal production, the semi-coke in the molten pool is not wetted by the liquid slag, which can effectively destroy the bubbles and achieve a dynamic balance, so that the bubbles in the slag are of different sizes. When the foaming speed Speed ​​up, semi-coke is not enough to suppress the formation of foam, and foamy slag will occur. After the foamy slag is formed, a large number of small bubbles appear in the slag, and the average density of the slag is less than 0.3t / m 3 .

[0146] Based on many years of production practice and summed up experience, the inventor of the present application divided the foam slag into three grades: slight foam slag, medium foam slag and severe foam slag, and clarified the...

Embodiment 3

[0182] Due to peripheral equipment failure and other reasons, after the SRV furnace enters the shutdown state, it is necessary to quickly find the cause and enter the re-air flow process. The SRV furnace startup logic control module follows the order of OW mode, Idle mode, Hold mode, OR-I mode, and OR-2 mode. Enter in sequence and return to normal production status.

[0183] Process technicians click the IDLE button of the DCS control system to enter the Idle mode, and send the signal to the hot blast stove control system. After entering the Idle state, ignite the natural gas spray gun, and the NG-Flow is increased to 6000Nm at most 3 / h, the SP parameter is set to 10-40kpa, the natural gas pressure adjustment range is 100-500kpa, the flue drum pressure is 1-4Mpa, the steam drum is sent to the power plant with a steam flow rate of 0-30t / h, and a stable steam drum cycle is established.

[0184] One of the judgment bases for switching from "Idle mode" to "Hold mode" is that HTT=...

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Abstract

The invention provides a control method and device suitable for the foamed slag furnace condition in iron bath smelting reduction. The method includes the following steps that firstly, according to the changes of the secondary combustion rate of coal gas, the calorific value of coal gas, the semi-coke content of smoke, the thermal load of a water cooled wall, the carbon content of molten iron, thecarbon powder content of slag, the slag density and the slag component index in iron bath smelting reduction production, whether foamed slag is generated or not is judged; secondly, if the foamed slag is generated, on the basis of existing production parameters, by increasing the ratio of the coal injection amount to the ore injection amount, the quaternary alkalinity of the slag is controlled to0.7-1.10, and the normal production of the furnace condition is recovered; and if the foamed slag is not generated, the production continues according to the existing production parameters. By meansof the method, accurate judgment of the foamed slag is achieved, rapid recovery of the normal production is achieved by controlling the production parameters, and the production efficiency is improved. By means of the method, the judgment basis and the recovery method of the the foamed slag furnace condition in iron bath smelting reduction are quantified, and the current blank of the production technology in the field is filled.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a control method and device suitable for the furnace condition of foam slag in iron bath smelting reduction. Background technique [0002] Iron bath smelting reduction is a process of completing the reduction of iron oxides in a molten iron bath. The iron bath smelting reduction method currently used is carried out in a smelting reduction furnace, and the ore and coal that have been heated outside the furnace and pre-reduced are added or injected into the furnace. In the slag zone in the furnace, the ore is dissolved into iron oxide in the slag, and then the iron reduced by the coal particles in the slag and the carbon-containing iron bead-like droplets saturated with carbon enters the iron bath. The CO produced by reduction and the volatile matter (mainly H) released from coal are secondary burned by the injected oxygen or air above the slag belt, and the heat ene...

Claims

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Application Information

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IPC IPC(8): C21B11/00
CPCC21B11/00
Inventor 张冠琪王金霞魏召强陈庆孟张晓峰王建磊王振华王林顺张光磊张伟
Owner SHANDONG MOLONG PETROLEUM MACHINERY
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