Coal-based Shaft Reduction Technology

Coal-based DRI Production Line uses various types of coal gas as fuel, and mixes processed lump ore or pellet with solid reducing agent (anthracite, etc.) to form charge. The whole reduction process combines the advantages of shaft furnace material top in and bottom out and tunnel kiln muffle heating. In one, preheating---reduction---cooling---automatic separation in a closed reaction tank in the furnace to obtain high-grade sponge iron, and the metallization rate of the product (DRI) can be as high as 98%. In addition, the production line occupies a small area, and the whole process is mechanized and continuously produced, with high output, good quality, low energy consumption, low pollution, wide selection of fuel and raw materials, and low operation and production costs. The production line can be well matched with powder metallurgy process and steelmaking process to form large-scale production capacity.
The special Si3N4 combined with SiC long-life reaction tank is used to maintain long-term continuous and stable production. If heat preservation measures are taken, the sponge iron can also be hot loaded into the steelmaking furnace to achieve low energy consumption for steelmaking.

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Main Performance Parameters of the Direct Reduction Furnace (the parameters can be adjusted according to the actual situation of the user)

No

Name

Unit

Parameters and Description

1

Reduction furnace raw materials

mm

Oxidized pellets φ25-30 / lump ore 15~25 (Fe≥68%)

2

Dimensions of reduction furnace

m

Length (30~80) * Width (15~20) * Height (20~35)

3

Reaction tank size (combination type)

mm

1500*460*(9000~13000)

4

Reaction tank material

 

Si3N4    combined with SiC

5

Restorative ability

t/y

1-50000t/y   100000t/y   200000t/y

6

temperature and pressure point

PC

computer monitoring

7

reduction temperature

 

1050~1150℃(Max 1200℃)

8

fuel and calorific value

KJ/Nm³

Natural gas/coke oven gas, etc. Qd≥8000/3800*4.18KJ/Nm³

9

Energy consumption

Nm³/h

Design: natural gas/coke oven gas 24450/5140 (188/394/t) 

(domestic production: consumption of reduction coal per ton of DRI is 400~500Kg; 

heating natural gas consumption is designed to be 188Nm³/h, 

which is equivalent to 350KG of standard coal. below this value)

10

fuel device

 

special burner

11

Air preheating method and temperature

KH type combined heat exchanger

12

In and out way

 

Continuous top in and bottom out

13

Main process equipment plant area

About 5000 

(including raw material briquetting production line, 

excluding raw materials, product storage yard, etc.)

14

The entire factory covers an area

≥20000 (plant layout can be adjusted according to local actual conditions)

 


Post time: Jul-20-2022