CN101126112A - Method and device for reducing metallized pellet by using high-purity water gas in pure oxygen shaft furnace - Google Patents
Method and device for reducing metallized pellet by using high-purity water gas in pure oxygen shaft furnace Download PDFInfo
- Publication number
- CN101126112A CN101126112A CNA200610047486XA CN200610047486A CN101126112A CN 101126112 A CN101126112 A CN 101126112A CN A200610047486X A CNA200610047486X A CN A200610047486XA CN 200610047486 A CN200610047486 A CN 200610047486A CN 101126112 A CN101126112 A CN 101126112A
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- Prior art keywords
- gas
- shaft furnace
- reduction
- pure oxygen
- metallized pellet
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Links
- 239000007789 gas Substances 0.000 title claims abstract description 45
- 239000008188 pellet Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000012498 ultrapure water Substances 0.000 title claims abstract description 20
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 238000010521 absorption reaction Methods 0.000 claims abstract description 4
- 238000009833 condensation Methods 0.000 claims abstract description 3
- 230000005494 condensation Effects 0.000 claims abstract description 3
- 238000002161 passivation Methods 0.000 claims abstract description 3
- 239000003034 coal gas Substances 0.000 claims description 27
- 230000002829 reductive effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000000112 cooling gas Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 241001504664 Crossocheilus latius Species 0.000 abstract 4
- 238000004321 preservation Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000009466 transformation Effects 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 241000282461 Canis lupus Species 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000012716 precipitator Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- Y02W30/54—
Abstract
The invention relates to a method of restoring metallized pellet by high purity water gas in a pure oxygen shaft furnace. The process is that: A. mill coal is used for preparing high purity of water gas. The high purity of water is sent into the shaft furnace from the under-part of the blowdowning stone roller of the shaft furnace and used for restoring pellet and high-grade iron ore as reducing gas and cooled gas. B. the moderate amount of pure oxygen is blasted into the upward side of the blowdowning stone roller, so as to burn a part of gas. C. the inlet pressure of gas is controlled by 0.4MPa to 2 Mpa while the pressure of oxygen is above that of gas. D. after dust abatement, gas passes through TRT and a transformation absorption device, and CO2 is recovered. Water vapor is put into a low pressure gasholder after condensation and partial separation. E. gas passing the through blowdowning stone roller is preheated by restored metallized pellet in a thermal state. F. metallized pellet which is cooled by gas is put into under-part of the blowdowning stone roller, and based on varied use, users of the next connection are supplied by different choices of the form of passivation and cooling or heat preservation. The invention has simple process flow, especially greatly expands operating factor and has greater economic and social benefits for less discharging carbon dioxide and improving the environment.
Description
(1) technical field
The present invention relates to a kind of production method of direct-reduced iron, mainly is the method for utilizing pure oxygen shaft furnace and high purity water coal gas metallized pellet reduction in shaft furnace.
(2) background technology
At present, the output of direct production direct-reduced iron reaches 6,000 ten thousand tons in the world, and wherein 90% is to utilize CO and the H that produces behind the natural gas pyrolysis
2Make reductive agent, its typical method is the Midex method of the U.S., because the restriction of natural gas source, and cost is too high, make shaft kiln directly reduced do not have in China developed.
Because having grasped the method for producing high-purity water coal gas with mill coal, we (see patent: the 200610045968.1) CO and the H2 that can replace natural gas pyrolysis to produce fully, making China is basic after gasification with the mill coal, produces direct-reduced iron by shaft furnace and will obtain very fast development.
Do not find by retrieval acid pellet, rich ore or carbonaceous pelletizing to be reduced, produce the processing method and the equipment of direct-reduced iron to produce high purity water coal gas after the gasification as reductive agent.
(3) summary of the invention
The object of the present invention is to provide a kind of method and apparatus that utilizes pure oxygen shaft furnace and high purity water coal gas metallized pellet reduction in shaft furnace,, make full use of the abundant mill coal of China's reserves, reduce discharging CO to reach production cost and the process energy consumption that reduces iron
2, further develop the purpose that hydrogen energy source is smelted.
The technical scheme that adopts is:
Utilize the method for high purity water gas reduction metallized pellet in the pure oxygen shaft furnace, comprise following process:
A, send into the shaft furnace from shaft furnace material roller bottom as reducing gas and cooling gas, pellet and high-grad iron ore deposit are reduced with mill coal self-control high purity water coal gas.
B, reduction institute heat requirement mainly are by blast an amount of pure oxygen burning part coal gas above material roller, improve, control the temperature of reduction shaft furnace band, by control oxygen, gas flow control reduction shaft furnace band temperature and exhaust gas component, exhaust temperature, the zone of reduction temperature is controlled at: about 1000-1250 ℃.
C, gas inlet pressure-controlling be at 0.4-2MPa,, oxygen pressure is greater than gas pressure.
D, coal gas reclaims CO directly by TRT (top pressure power generation) through pressure-swing absorption apparatus after dedusting
2, water vapour enters the low-pressure gas jar after condensation portion is separated out, can be through the pressurization recycling, or as heating and burning boiler usefulness.
E, coal gas are by behind the material roller, and hot metallized pellet should be greater than more than 700 ℃ to the preheating temperature of coal gas.
F, metallized pellet enters down blow-down drum through coal gas cooling back, supplies with next link user according to the different passivation of different purposes selections and cooling or heat preserving mode.
The present invention adopts following equipment:
Adopt shaft furnace to make reduction furnace, matching with shaft furnace is equipped with the pressing gas producer, and the coal gas output tube is connected to the ring gas of shaft furnace bottom and sends into pipe; Derive to link to each other with the top gas on shaft furnace top and gravitational dust collection is installed successively, ceramic pipe type dedusting, bag-type dust, CO
2Pressure-swing absorption apparatus; Be furnished with two clock-type furnace roofs in the upper end of shaft furnace, be provided with wolf's fang formula pair roller blanking machine in the lower end of shaft furnace, the lower end of blanking machine connects tundish, and the lower end of tundish is provided with the discharge tank that is equipped with upper sealing valve and lower seal valve; Matching with two clock-type furnace roofs is equipped with the mineral aggregate groove, the feeding device that shocking feeder, weightometer and winding type feeder are formed.
The present invention utilizes the use equipment of high purity water coal gas direct-reduced iron also can comprise: matching with discharge tank is equipped with circulating cooling system and the stock gas top pressure power generation system that cooling gas control valve, cooling scrubber and cooling gas press are formed.
The present invention utilizes high purity water coal gas instead of natural gas, without the foundation that is used to produce direct-reduced iron as reductive agent behind the cracking direct heating is:
1, the main component of high purity water coal gas contains: H
2---48-52% contains CO----52-48%, only uses wherein H without cracking
2And CO, under 900 ℃ of temperature, can reduce to iron ore, the working control temperature is between 1000-1250 ℃.
2, the actual reaction that occurs in the shaft furnace is:
Reduction reaction:
Fe
2O
3+H
2＝2FeO+H
2O
Fe
2O
3+CO＝2FeO+CO
2
Fe
3O
4+4H
2＝3Fe+4H
2O
Fe
3O
4+4CO＝3Fe+4CO
2
FeO+H
2＝Fe+H
2O
FeO+CO＝Fe+CO
2
Oxidizing reaction:
2C+O2＝2CO
2H2+O2＝2H
2O
Analyse the carbon reaction:
2CO＝CO
2+C
The present invention utilizes mill coal pressurization gas making, direct production high purity water coal gas, by shaft kiln directly reduced metallized pellet technology, utilize pure oxygen to adjust temperature and exhaust gas component, compare with the Midrex method, cancelled expensive Sweet natural gas, and without coking coal, supply and demand energy consumption and production cost all have reduction significantly, and technical process is simplified, especially enlarged the utilization ratio of hydrogen energy source, to reducing emission of carbon dioxide with improve environment bigger economic and social benefit is arranged.
(4) description of drawings
Fig. 1 is the system diagram that the present invention uses equipment.
Description of reference numerals:
1---mineral aggregate groove 2---shocking feeder 3---electronic weighting meter 4---winding type feeder
The two clock-type furnace roof 6---shaft furnace 7---wolf's fang formula pair roller blanking machine 8---tundish of 5---
9---upper sealing valve 10---storage tank 11---lower seal valve 12 coal gas are sent into pipe
13---producer gas generator 14---oxygen is sent into pipe 15---gravitational precipitator
16---ceramic pipe type fly-ash separator 17---sack cleaner 18---carbonic acid gas adsorption unit
The 19---excess pressure power generating device
(5) embodiment
Utilize the method and apparatus of high purity water gas reduction metallized pellet in the pure oxygen shaft furnace, its main points are that pellet or higher-grade rich ore are stored in the mineral aggregate groove 1, raw material is added in the truck of winding type feeder 4 through shocking feeder 2, electronic weighting meter 3, be transported to furnace roof by windlass, mineral aggregate joined in the shaft furnace 6 through two clock-type furnace roofs 5.Shaft furnace is made of box hat and refractory lining, shaft furnace 6 bottoms are provided with the oxygen that is communicated in the shaft furnace through several jet orifices and send into pipe 14, the high purity water coal gas of being produced by producer gas generator 13 is sent into pipe 12 through coal gas and is sent into tundish 8 bottoms, gas pressure is controlled at 0.5-0.8Mpa, cold water coal gas directly cools off hot reduced iron, cold water coal gas is preheated simultaneously, water-gas after the preheating enters into the reduction zone, the reduction zone temperature is controlled at 1000-1050 ℃, send into pipe 14 from oxygen and blast hot pure oxygen burning part coal gas, reduction reaction institute heat requirement is provided, furnace gas after the reduction is derived from shaft furnace top, through gravitational precipitator 15, ceramic pipe type fly-ash separator 16 and sack cleaner 17 and carbonic acid gas adsorption unit 18 purify and lower the temperature.Passing to excess pressure power generating device 19 through the top gas that purifies and lower the temperature by pipeline utilizes again.Metallized pellet after the reduction 7 pairs of bonding metallized pellets of wolf's fang formula pair roller blanking machine through being assemblied in the shaft furnace lower end carry out fragmentation, and it is dropped in the tundish 8 uniformly.Place the product of tundish to enter storage tank 10, after the lower seal valve 11 of discharge tank is opened, release then through upper sealing valve 9.
Claims (4)
1. utilize the method for high purity water gas reduction metallized pellet in the pure oxygen shaft furnace, it is characterized in that comprising following process:
A, send into the shaft furnace from shaft furnace material roller bottom as reducing gas and cooling gas, pellet and high-grad iron ore deposit are reduced with mill coal self-control high purity water coal gas;
B, reduction institute heat requirement mainly are by blast an amount of pure oxygen burning part coal gas above material roller, improve the temperature of control reduction shaft furnace band, by control oxygen, gas flow control reduction shaft furnace band temperature and exhaust gas component, exhaust temperature, the zone of reduction temperature is controlled at: about 1000-1250 ℃;
C, gas inlet pressure-controlling are at 0.4-2MPa, and oxygen pressure is greater than gas pressure;
D, coal gas reclaims CO directly by top pressure power generation through pressure-swing absorption apparatus after dedusting
2, water vapour enters the low-pressure gas jar after condensation portion is separated out, can be through the pressurization recycling, or as heating and burning boiler usefulness;
E, coal gas be by behind the material roller, by the hot metallized pellet after the reduction to gas preheating;
F, metallized pellet enters down blow-down drum through coal gas cooling back, supplies with next link user according to the different passivation of different purposes selections and cooling or heat preserving mode.
2. utilize the method for high purity water gas reduction metallized pellet in the pure oxygen shaft furnace according to claim 1, it is characterized in that the hot metal group of described low temperature water gas after reduction is preheated to more than 700 ℃.
3. utilize the method for high purity water gas reduction metallized pellet in the pure oxygen shaft furnace according to claim 1, it is characterized in that feeding pure oxygen in the described shaft furnace,, make zone of reduction remain on 1000-1050 ℃ by partial combustion coal gas.
4. utilize the method for high purity water gas reduction metallized pellet in the pure oxygen shaft furnace according to claim 1, it is characterized in that described gas inlet pressure preferably is controlled at 0.5-0.8Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610047486XA CN100554439C (en) | 2006-08-18 | 2006-08-18 | Utilize the method and apparatus of high purity water gas reduction metallized pellet in the pure oxygen shaft furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610047486XA CN100554439C (en) | 2006-08-18 | 2006-08-18 | Utilize the method and apparatus of high purity water gas reduction metallized pellet in the pure oxygen shaft furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101126112A true CN101126112A (en) | 2008-02-20 |
| CN100554439C CN100554439C (en) | 2009-10-28 |
Family
ID=39094246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610047486XA Expired - Fee Related CN100554439C (en) | 2006-08-18 | 2006-08-18 | Utilize the method and apparatus of high purity water gas reduction metallized pellet in the pure oxygen shaft furnace |
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| Country | Link |
|---|---|
| CN (1) | CN100554439C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676220A (en) * | 2016-12-15 | 2017-05-17 | 江苏省冶金设计院有限公司 | Gas base shaft furnace for preparing sponge iron by cold-solidified pellets and method thereof |
| CN106957936A (en) * | 2017-04-11 | 2017-07-18 | 江苏省冶金设计院有限公司 | A kind of system and method for reduction shaft furnace and mill choosing separation iron, vanadium and titanium |
| CN114107591A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Heating-pure hydrogen reduction cooling system and method |
-
2006
- 2006-08-18 CN CNB200610047486XA patent/CN100554439C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106676220A (en) * | 2016-12-15 | 2017-05-17 | 江苏省冶金设计院有限公司 | Gas base shaft furnace for preparing sponge iron by cold-solidified pellets and method thereof |
| CN106957936A (en) * | 2017-04-11 | 2017-07-18 | 江苏省冶金设计院有限公司 | A kind of system and method for reduction shaft furnace and mill choosing separation iron, vanadium and titanium |
| CN114107591A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Heating-pure hydrogen reduction cooling system and method |
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| Publication number | Publication date |
|---|---|
| CN100554439C (en) | 2009-10-28 |
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