Blast Furnace full slide

BLAST FURNACE

Group 7: Vũ Thị HườngHà Bảo ChâuNguyễn Thị Huyến

Purpose

•Give information about the blast furnace

•Compare two kinds of blast furnace

Outline

•Overview

•Principle operation

•Blast furnace and Finex

•Conclusion

Outline

•Overview

•Principle operation

•Blast furnace and Finex

•Conclusion

Overview

•Definition

•Structure

•Kinds of blast furnace

Definition

•Blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals

•Metals are generally iron, but also others such as lead, copper

Structure

Kinds of blast furnace

•Based on generating heat furnace

-Combustion type

-Electric type

Kinds of blast furnace•Based on the mode of material charged into it

-Batch type

-Periodic type

-Intermittent furnace

Kinds of blast furnace

•Based on the method of waste heat of recovery

-Recuperative furnace

-Regenerative furnace

Kinds of blast furnace

•Based on the mode of heat transfer

-Open fire place furnace

-Heated through medium

Principle operation

Blast furnace is a large steel structure lined with refractory firebricks that can withstand temperature approaching 2000◦ C

Stage 1

• The mixture of 3 raw materials (Iron ore, limestone, coke), carried over the charging ramp, is added to the top in charging hole

• Water is released, travels through 1 end of the water channel & pours down from the other end, hits the water wheel.

• The water wheel acts as a turbine, rotate the cams

• Reheated compressed air is introduced at the bottom for tuyere entering the crucible

Stage 3

Stage 4

CO2, CO, N and air is let off through a pipe, at high temperature to stoves

Stage 5

• The mass in the furnace becomes molten iron, decant in the crucible

• The impurities called slag is lighter and float on the top

Stage 6The slag is drained to a pipe in the upper portion of the crucible which is called slag pipe

The iron on the below runs into sand mold to harden. The product is known as pig iron, & floats into a pig iron bed

Outline

Structure of blast furnacePrinciple operation of furnace Blast furnace and Finex

Blast furnace vs FinexBlast furnace Finex

-  The most important process for the production of hot metal. An integral part of this process route is the coking of coal and sintering of fine ore.-  Blended iron-ore fines are agglomerated at a sinter plant, and coking coal is processed at coke-ovens in preparation for use in the blast furnace.

- A new technology for hot metal production which uses untreated fine ores and coal instead of sinter and coke. 

- Fine iron -> the fluidizedbed reactors -> hot metal in  the melter gasifier

Blast furnace vs Finex

Blast furnace vs Finex

•Finex is more environmentally friendly than blast furnace

Blast furnace vs Finex

•Hot – metal quality: key benefit Finex has over blast furnace

Blast furnace vs FinexBlast furnace Finex

Strengths High energy efficiencyHigh productivityLong service

Use low grade Use low cost resources Reduce the level of air pollution

Weaknesses Use of high grade raw materials Coke and sinter making processes required Generation of air pollutant such as SOx, NOx, Dioxin and dust

Conclusion• Blast furnace equipment is in continuous evolution and modern, giant furnaces produce 13,000 tons per day.

• Blast furnaces will survive into the next millennium because the larger, efficient furnaces can produce hot metal at costs competitive with other iron making technologies

References

http://www.kobelco.co.jp/english/ktr/pdf/ktr_26/012-020.pdf

http://www.enggpedia.com/chemical-engineering-encyclopedia/dictionary/thermodynamics/1778-furnace-types-classification-of-furnace

http://onlinelibrary.wiley.com/doi/10.1002/srin.201100199/abstract

Summary

• Overview• Principle operation• Blast furnace and Finex• Conclusion