Rotary hearth furnace thermal control method for directly reducing carbon-containing pellets

A control method and technology of rotary hearth furnace, applied in the direction of furnace, hearth furnace, furnace type, etc., can solve problems such as complex process, improve mixing conditions, improve thermal efficiency of equipment, and reduce pollution.

Active Publication Date: 2014-09-03
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional steel rolling heating process, no matter considering the combustion, flow and gas-solid heat exchange process in the furnace, or analyzing the physical and chemical reaction and heat and mass transfer process inside the material, it can be seen that the process of direct reduction of rotary hearth furnace is more efficient. It is complicated. If the existing thermal control method of the steel rolling annular heating furnace is directly used to control the rotary hearth furnace, there will be many problems in meeting the requirements of the direct reduction process of carbon-containing pellets, energy saving and emission reduction of equipment, etc.

Method used

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  • Rotary hearth furnace thermal control method for directly reducing carbon-containing pellets
  • Rotary hearth furnace thermal control method for directly reducing carbon-containing pellets
  • Rotary hearth furnace thermal control method for directly reducing carbon-containing pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The bottom width of the rotary hearth furnace in the example of the present invention is 5m, and the effective area is 412m 2 . The whole furnace is divided into preheating section, reduction section I, reduction section II, soaking section I and soaking section II from the feed end to the discharge end in sequence, and the smoke exhaust port of the furnace is set between the preheating section and reduction section I . The overall structure of the rotary hearth furnace is as follows: figure 1 shown. The parameters of carbon-containing pellets (green pellets) in the furnace are shown in Table 1.

[0032] Table 1 Parameters of carbon-containing pellets (green pellets) in the furnace (%)

[0033] TF

Fe 2 o 3

FeO

CaO

SiO 2

al 2 o 3

MgO

S

P

C

other

48.60

50.86

16.71

3.36

4.38

0.95

1.42

0.71

0.05

14.25

5.15

[0034] The temperature...

Embodiment 2

[0051] The bottom width of the rotary hearth furnace in the example of the present invention is 2m, and the effective area is 56m 2 . The parameters of the carbon-containing pellets (green pellets) entering the furnace and the temperature of the carbon-containing pellets entering the furnace are the same as in Example 1.

[0052] The thermal control method of the rotary hearth furnace for direct reduction of carbon-containing pellets includes three aspects: furnace temperature control, furnace gas composition control and air supply:

[0053] (1) Control of blast furnace temperature

[0054] The control furnace temperature of each section of the rotary hearth furnace is as follows:

[0055] 1) Control the furnace temperature at 1050°C in the preheating section;

[0056] 2) Control the furnace temperature at 1200°C in the reduction section I and reduction section II;

[0057] 3) Control the furnace temperature at 1180°C in the soaking section I, and control the furnace tempe...

Embodiment 3

[0068] The bottom width of the rotary hearth furnace in the example of the present invention is 3m, and the effective area is 100m 2 . The parameters of the carbon-containing pellets (green pellets) entering the furnace and the temperature of the carbon-containing pellets entering the furnace are the same as in Example 1.

[0069] The thermal control method of the rotary hearth furnace for direct reduction of carbon-containing pellets includes three aspects: furnace temperature control, furnace gas composition control and air supply:

[0070] (1) Control of blast furnace temperature

[0071] The control furnace temperature of each section of the rotary hearth furnace is as follows:

[0072] 1) Control the furnace temperature at 1150°C in the preheating section;

[0073] 2) Control the furnace temperature at 1300°C in the reduction stage I and reduction stage II;

[0074] 3) Control the furnace temperature at 1300°C in the soaking section I, and control the furnace temperat...

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Abstract

The invention relates to the field of iron and steel production, in particular to a rotary hearth furnace thermal control method for directly reducing carbon-containing pellets. The rotary hearth furnace thermal control method for directly reducing the carbon-containing pellets, which is disclosed by the invention, comprises the following steps: 1) the furnace temperature is controlled from 1050 to 1250 DEG C on a preheating section; 2) the furnace temperature is controlled from 1200 to 1400 DEG C on a reducing section I and a reducing section II; 3) the furnace temperature from 1180 to 1420 DEG C on a soaking section I and controlled from 1050 to 1250 DEGC on a soaking section II; and in the step 1), the step 2) and the step 3), components of furnace gas at the furnace bottom are controlled, wherein the volumetric component ratio of O2 is controlled to be less than 3 percent and that of CO is controlled to be less than 500ppm. The rotary hearth furnace thermal control method disclosed by the invention not only satisfies national policy requirements of energy conservation, emission reduction and circular economy, but also provides space for the reduction of own production cost of an enterprise.

Description

technical field [0001] The invention relates to the field of iron and steel production, in particular, the invention relates to a rotary hearth furnace thermal control method for direct reduction of carbon-containing pellets. Background technique [0002] The predecessor of the rotary hearth furnace is the ring-shaped heating furnace for steel rolling. It has been used in the direct reduction process of carbon-containing pellets in the past 30 years, and has gradually developed into a new coal-based direct reduction ironmaking process. Because this process does not require the preparation of fuel and the deep processing of raw materials, it has a positive effect on the rational use of natural resources and the protection of the human environment, so it has received widespread attention from the metallurgical industry. At present, the research and development of rotary hearth furnace technology has developed from the United States, Canada, Japan and Germany to many countries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/10
Inventor 曾晖江泽毅陈伟武宇亮姜雷佘雪峰李建云张英
Owner LAIWU IRON & STEEL GRP
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