GB2057508A - Blast compositions in shaft furnaces - Google Patents
Blast compositions in shaft furnaces Download PDFInfo
- Publication number
- GB2057508A GB2057508A GB8020171A GB8020171A GB2057508A GB 2057508 A GB2057508 A GB 2057508A GB 8020171 A GB8020171 A GB 8020171A GB 8020171 A GB8020171 A GB 8020171A GB 2057508 A GB2057508 A GB 2057508A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blast
- air
- gaseous fluid
- furnace
- compositions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000203 mixture Substances 0.000 title 1
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 8
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 239000000571 coke Substances 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000006735 deficit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
A gaseous fluid having a lower oxygen content than air e.g. nitrogen or combustion vapour, is added to the air constituting the hot blast to a shaft furnace, e.g. an iron blast furnace without hydrocarbon injections, so that a high blast temperature can be maintained.
Description
SPECIFICATION Method of operating a shaft furnace
The present invention relates to the operation of shaft furnaces, particularly, but not exclusively, blast furnaces for producing pig iron.
For some years blast furnaces have been charged with increasingly greater amounts of hydrocarbons such as fuel oil or natural gas, in order to reduce coke consumption. Such injections have a cooling effect and high air-blast temperatures have to be used in order to main a sufficient flame temperature.
Nowadays, however, hydrocarbons are increasingly costly and there is a possibility that there will be difficulties in obtaining supplies. Any reduction in the amounts of hydrocarbons injected into a blast furnace, in which the air-blast is maintained at a high temperature, would however lead to excessive flame temperatures and to a considerable heat deficit in the furnace throat.
Strictly from a thermal point of view, it would be possible to replace these injections of hydrocarbons by other cooling injections, for example water vapour, in order to maintain high air-blast temperatures. The latter, however, is very costly and its production requires the consumption of considerable amounts of energy. In addition, such an injection leads to an increase in the coke rate by 25 to 30 kg per tonne of pig iron. The industry therefore requires a method of operating blast furnaces which, whilst maintaining the high air-blast temperatures used at present, enables the overall energy consumption to be minimised.
During research aimed at developing a method which fulfils this objective, we have now discovered that it is possible to maintain high air-blast temperatures, even when there are not hydrocarbon injections, by reducing the oxygen content of the air-blast.
Thus, according to the present invention, the oxygen content of the air blown into the blast furnace is reduced by adding a gaseous fluid to the air-biast, which fluid has a lower oxygen content than the air-blast.
Preferably, the gaseous fluid is introduced, without pressure, into the air taken in by the blowing apparatus.
A particularly advantageous embodiment consists in introducing combustion vapour which is rich in nitrogen into the air-blast, this vapour being supplied for example from Cowper stoves.
A further advantageous embodiment consists in introducing nitrogen supplied for example from an oxygen production plant, into the air-blast.
By way of example, the following table shows the results obtained respectively with a fuel oil injection, without any injection, with the addition of nitrogen to the hot air-blast, and with the addition of vapour from Cowper stoves to the air-blast.
The temperature in the furnace throat was maintained constant at 1 200C.
Fuel oil air N2 Vapour injection alone injection injection Coke rate kg/t 404 507 464 488 Air-blast temperature "C 1250 - 934 934 1250 1250 Injections fuel oil amount kg/t 60 - - - N2 amount m3N/t - - 1250 temp. C ~ ~ 1250 - Cowper Vapour amount m3N/t - - - 135 temp. C - - - 1250 Throat temperature "C 125 125 125 129
This example clearly shows the advantage of the invention in respect of the coke rate when the blast furnace does not receive any hydrocarbon injections.
Although the above description is directed mainly to the iron blast furnace, it is equally applicable to other shaft furnaces.
Claims (4)
1. A method of operating a shaft furnace in which air at elevated temperature is blown into the furnace without hydrocarbon injections, and the oxygen content of the air is reduced by adding to it a gaseous fluid having an oxygen content which is lower than that of the air.
2. A method as claimed in claim 1, in which the gaseous fluid comprises nitrogen.
3. A method as claimed in claim 1, in which the gaseous fluid comprises combustion vapour.
4. A method as claimed in any of claims 1 to 3, in which the gaseous fluid is added to the air taken in by a blowing apparatus.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE6/46867A BE877174A (en) | 1979-06-21 | 1979-06-21 | METHOD OF CONDUCTING A TANK OVEN. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2057508A true GB2057508A (en) | 1981-04-01 |
Family
ID=3874828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8020171A Withdrawn GB2057508A (en) | 1979-06-21 | 1980-06-20 | Blast compositions in shaft furnaces |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE877174A (en) |
| DE (1) | DE3023062A1 (en) |
| FR (1) | FR2459290A1 (en) |
| GB (1) | GB2057508A (en) |
| LU (1) | LU82530A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001014599A1 (en) * | 1999-08-24 | 2001-03-01 | Voest-Alpine Industrieanlagenbau Gmbh | Method for operating a melt-down gasifier |
-
1979
- 1979-06-21 BE BE6/46867A patent/BE877174A/en unknown
-
1980
- 1980-06-18 LU LU82530A patent/LU82530A1/en unknown
- 1980-06-20 FR FR8014052A patent/FR2459290A1/en active Granted
- 1980-06-20 GB GB8020171A patent/GB2057508A/en not_active Withdrawn
- 1980-06-20 DE DE19803023062 patent/DE3023062A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001014599A1 (en) * | 1999-08-24 | 2001-03-01 | Voest-Alpine Industrieanlagenbau Gmbh | Method for operating a melt-down gasifier |
Also Published As
| Publication number | Publication date |
|---|---|
| LU82530A1 (en) | 1980-10-24 |
| DE3023062A1 (en) | 1981-01-08 |
| FR2459290B3 (en) | 1982-04-30 |
| FR2459290A1 (en) | 1981-01-09 |
| BE877174A (en) | 1979-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |