CN102382915A - Method by adopting carbon dioxide as transmission medium for blast furnace coal injection - Google Patents
Method by adopting carbon dioxide as transmission medium for blast furnace coal injection Download PDFInfo
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- CN102382915A CN102382915A CN2010102687481A CN201010268748A CN102382915A CN 102382915 A CN102382915 A CN 102382915A CN 2010102687481 A CN2010102687481 A CN 2010102687481A CN 201010268748 A CN201010268748 A CN 201010268748A CN 102382915 A CN102382915 A CN 102382915A
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Abstract
The invention relates to a blast furnace iron smelting field, in particular to a method by adopting carbon dioxide as transmission medium for blast furnace coal injection, which comprises the following steps that: a. storing and transporting raw coal; b. preparing dry gases; c. preparing pulverized coal; d. transporting the pulverized coal; and e. injecting and blowing the pulverized coal, and the method is characterized in that: d. when the pulverized coal is transported, the carbon dioxide is adopted as a carrier for the pulverized coal, and the pulverized coal is transported to a transportation pipeline through pressure difference; and e. when the pulverized coal is injected and blown, carbon dioxide gas is adopted as the carrier for the pulverized coal, and the pulverized coal is delivered into the transportation pipeline through the pressure difference to be injected a blast furnace. Due to the adoption of the method, the coke ratio and the consumption of expensive coke can be reduced, and the purity and the heat value of the blast furnace coal gas can be improved.
Description
Technical field
The present invention relates to blast furnace smelting iron field, be specially a kind of method of using carbonic acid gas to carry out pulverized coal injection as transmission medium.
Background technology
Pulverized coal injection is from blast-furnace tuyere directly winding-up is levigate in stove pulverized anthracite or bituminous coal powder or the two mixed coal powder; Work to provide heat and reductive agent to substitute coke; Pulverized coal injection is that modern blast furnace is smelted the great technical measures that significantly reduce coke ratio and pig iron cost; Be the great technological revolution that modern blast furnace is smelted, can create huge economic benefit and obtain fast development with it.China is exploitation coal powder injection technology country early, and particularly in recent ten years, furnace coal spraying technology has obtained using widely and developing.Moreover, Iron And Steel Industry will realize that the Eleventh Five-Year Plan period the GDP energy consumption reduces by 20%, and the groundwork direction will than on be worked hard at the reduction iron-smelting fuel exactly, because the energy consumption of blast furnace ironmaking operation will account for about 50% of associated enterprises's total energy consumption.The fuel ratio of blast furnace ironmaking is ratio of putting coke into furnace+coal powder injection ratio+nut coke ratio.So the optimization problem of coal powder injection technology is the huge meaning that has low carbon emission reduction just.Existing pulverized coal injection into blast furna powder craft has two kinds of patterns, the pattern of promptly jetting indirectly and direct winding-up pattern.Pulverized coal preparation system and injection system together to the technology of blast furnace blowing direct coal spraying process; Pulverized coal preparation system and injection system separate, and through tank car or pneumatic transport pipeline coal dust are delivered to the injecting station near blast furnace from the powder process workshop, again to the technology of pulverized coal injection in blast furnace indirect coal spraying process.The general indirect blowing process that adopts more.The coal spraying process system mainly is made up of raw coal storing, pulverized coal preparation, coal dust conveying, dry gas preparation and power system indirectly, and technical process is as shown in Figure 1.Pulverized coal injection generally adopts nitrogen as the coal dust delivery medium at present, and nitrogen is the bigger gas of unreactiveness, and the reducing atmosphere required for blast furnace ironmaking do not have help, and this has just limited the raising of blast furnace ironmaking efficient.
Summary of the invention
In order to overcome the defective of prior art, a kind of coke ratio and lower smelting iron method of pig iron cost is provided, the invention discloses a kind of method of using carbonic acid gas to carry out pulverized coal injection as transmission medium.
The present invention reaches goal of the invention through following technical scheme:
A kind of carbonic acid gas that uses carries out the method for pulverized coal injection as transmission medium, carries out successively as follows: a. storing raw coal, b. prepare dry gas, c. prepares coal dust, d. pulverized coal conveying and e. coal injection, it is characterized in that:
When a. storing and transporting raw coal, select for use ash content less than 15%, sulphur content is lower than 1%, water ratio is lower than 2% hard coal or bituminous coal, and control storing temperature is at 70 ℃～80 ℃;
When b. preparing dry gas; Select for use blast funnace hot blast stove to burn kiln gas or combination drying gas; Combination drying gas by account for volume 90%～95% and temperature 150 ℃～300 ℃ hot blast stove burning flue gas with account for high-temperature flue gas that volume 5%～10% and the temperature roasting kiln at 9000 ℃～1000 ℃ produces and mix mutually and process, the dry gas that makes is sent into coal pulverizer;
When c. preparing coal dust, raw coal is imported coal pulverizer and under the atmosphere of dry gas, worn into coal dust, make that granularity partly accounts for 70%～100% for-200 purposes in the coal dust, and the coal dust that makes is stored in the Pulverized Coal Bin;
D. during pulverized coal conveying, be carrier with coal dust with the dioxide gas, utilize draught head that coal dust is delivered to transport pipeline from Pulverized Coal Bin, the minimum value v of the transfer rate of coal dust confirms by following formula:
In the following formula: μ is nondimensional coefficient, gets 5～5.5, ρ
sBe the coal dust true density, kg/m gets in unit
3, ρ
aBe gas density, kg/m gets in unit
3, d is the pulverized coal particle diameter, mm gets in unit, calculate v unit be m/s;
E. during coal injection, be carrier with the dioxide gas, utilize draught head that coal dust is sprayed in the blast furnace from transport pipe coal dust.
Described use carbonic acid gas carries out the method for pulverized coal injection as transmission medium, it is characterized in that:
E. during coal injection, the blast temperature of blast furnace makes the carbonic acid gas zone that is generated by burning in the blast furnace hearth along State of Blast Furnace week uniform distribution between 1000 ℃～2000 ℃, and in the radial direction size suitably.
Coal-injection process adopts nitrogen or pressurized air more at present, uses carbonic acid gas then to rarely have report as the instance of delivery medium.Replace nitrogen to carry out the pulverized coal injection operation with carbonic acid gas; Still adopting promptly has technical process, just includes carbonic acid gas in airing system, and replaces nitrogen to be used for coal dust transmission and winding-up; Have the following advantages: 1. carbonic acid gas promotes the generation that indirect reduction is reacted after getting into blast furnace; But the carbon monoxide that the carbon monoxide instead of part char combustion that the incomplete combustion reaction is produced before the air port produces can reduce coke ratio thus, and expensive coke usage quantity reduces can reduce smelting cost greatly; 2. after transmission medium was participated in reaction in furnace, the blast furnace waste gas total amount reduced, and wherein a nitrogen content obviously reduces, and the substitute is [CO
2+ CO] the amount increase, the increase of carbon monoxide content can improve blast furnace gas purity and calorific value.
Description of drawings
Fig. 1 is the process flow sheet of bf coal injection system.
Embodiment
Below further specify the present invention through specific embodiment.
Embodiment 1
A kind of carbonic acid gas that uses carries out the method for pulverized coal injection as transmission medium, carries out successively as follows: a. storing raw coal, b. prepare dry gas, c. prepares coal dust, d. pulverized coal conveying and e. coal injection, and concrete steps are following::
When a. storing and transporting raw coal, select for use ash content less than 15%, sulphur content is lower than 1%, water ratio is lower than 2% hard coal or bituminous coal, and control storing temperature is at 70 ℃～80 ℃;
When b. preparing dry gas; Select for use blast funnace hot blast stove to burn kiln gas or combination drying gas; Combination drying gas by account for volume 90%～95% and temperature 150 ℃～300 ℃ hot blast stove burning flue gas with account for high-temperature flue gas that volume 5%～10% and the temperature roasting kiln at 9000 ℃～1000 ℃ produces and mix mutually and process, the dry gas that makes is sent into coal pulverizer;
When c. preparing coal dust, raw coal is imported coal pulverizer and under the atmosphere of dry gas, worn into coal dust, make that granularity partly accounts for 70%～100% for-200 purposes in the coal dust, and the coal dust that makes is stored in the Pulverized Coal Bin;
D. during pulverized coal conveying, be carrier with coal dust with the dioxide gas, utilize draught head that coal dust is delivered to transport pipeline from Pulverized Coal Bin, the minimum value v of the transfer rate of coal dust confirms by following formula:
In the following formula: μ is nondimensional coefficient, gets 5～5.5, and present embodiment gets 5.11, ρ
sBe the coal dust true density, kg/m gets in unit
3, ρ
aBe gas density, kg/m gets in unit
3, d is the pulverized coal particle diameter, mm gets in unit, calculate v unit be m/s;
E. during coal injection, be carrier with the dioxide gas, utilize draught head that coal dust is sprayed in the blast furnace from transport pipe coal dust.
During coal injection, because reaction CO
2+ C=2CO is a strong endothermic reaction; Use that carbonic acid gas is made transmission medium instead and need to improve wind-warm syndrome 20%～80% under the constant situation of other conditions; Originate with additional heat; The wind-warm syndrome of original technology is usually between 800 ℃～1200 ℃, so the blast temperature of blast furnace is controlled between 1000 ℃～2000 ℃.
Use carbonic acid gas to do transmission medium, make that the carbonic acid gas in blast-furnace tuyere zone is highly enriched, thus inhibited reaction C+O greatly
2=CO
2The forward of the reaction of (+Q) carries out and impels and react CO
2+ C=2CO (carries out Q) that (+Q representes that this reacts and is thermopositive reaction;-Q representes that this reacts and is thermo-negative reaction); The increase of CO content helps the generation of indirect reduction reaction, but because this reaction is strong endothermic reaction, can cause that the air port regional temperature descends; And the expansion zone of combustion, zone of combustion promptly refers to the distributed areas of the carbonic acid gas that the blast furnace hearth fuel combustion generates.The size of zone of combustion influences the initial distribution of coal gas stream.Zone of combustion stretches to the center, then central gas stream development, and the cupola well core temperature raises; If zone of combustion too can cause the center over-blowing to the center development, the edge deficiency of air increases the friction resistance between furnace charge and the furnace wall, is unfavorable for smooth operation of furnace.To different blast furnace sizes, evenly active in order to guarantee furnace cylinder working, zone of combustion was evenly distributed along stove week, and in the radial direction size suitably.
After using carbonic acid gas to make transmission medium; Carbon in the coal dust in the zone, air port not only will with the carbon dioxide reaction of enrichment; Also will with the oxygen reaction in the air blast, need adjustment injecting coal quantity and Rich Oxygen Amount to reach best proportioning, with the perfect combustion of promotion coal dust before the air port.
The carbon monoxide that the carbon monoxide instead of part char combustion that the incomplete combustion reaction produces before the air port produces reduces coke ratio in the time of thus, expensive coke consumption reduces finally can reduce the blast-furnace smelting cost.
Because use carbonic acid gas to replace original pressurized air or nitrogen as transmission medium, the waste gas total amount of discharging via blast furnace should reduce, wherein a nitrogen content can obviously reduce, and the substitute is [CO
2+ CO] increase of amount, the blast furnace gas purity increases, and calorific value is improved.
Increasing of amount of carbon dioxide can cause carbon to dissolve the increase of damage reaction potential energy simultaneously; The reaction that takes place on the coke surface can make coke produce a large amount of holes and crack; The intensity variation; Be prone in the decline process, produce powder and worsen permeability of stock column and liquid permeability, thus must carry out rational proportion to the carbonic acid gas consumption, to reduce the generation that carbon dissolves the damage reaction.
Claims (2)
1. one kind is used carbonic acid gas to carry out the method for pulverized coal injection as transmission medium, carries out successively as follows: a. storing raw coal, b. prepare dry gas, c. prepares coal dust, d. pulverized coal conveying and e. coal injection, it is characterized in that:
When a. storing and transporting raw coal, select for use ash content less than 15%, sulphur content is lower than 1%, water ratio is lower than 2% hard coal or bituminous coal, and control storing temperature is at 70 ℃～80 ℃;
When b. preparing dry gas; Select for use blast funnace hot blast stove to burn kiln gas or combination drying gas; Combination drying gas by account for volume 90%～95% and temperature 150 ℃～300 ℃ hot blast stove burning flue gas with account for high-temperature flue gas that volume 5%～10% and the temperature roasting kiln at 9000 ℃～1000 ℃ produces and mix mutually and process, the dry gas that makes is sent into coal pulverizer;
When c. preparing coal dust, raw coal is imported coal pulverizer and under the atmosphere of dry gas, worn into coal dust, make that granularity partly accounts for 70%～100% for-200 purposes in the coal dust, and the coal dust that makes is stored in the Pulverized Coal Bin;
D. during pulverized coal conveying, be carrier with coal dust with the dioxide gas, utilize draught head that coal dust is delivered to transport pipeline from Pulverized Coal Bin, the minimum value v of the transfer rate of coal dust confirms by following formula:
In the following formula: μ is nondimensional coefficient, gets 5～5.5, ρ
sBe the coal dust true density, kg/m gets in unit
3, ρ
aBe gas density, kg/m gets in unit
3, d is the pulverized coal particle diameter, mm gets in unit, calculate v unit be m/s;
E. during coal injection, be carrier with the dioxide gas, utilize draught head that coal dust is sprayed in the blast furnace from transport pipe coal dust.
2. use carbonic acid gas as claimed in claim 1 carries out the method for pulverized coal injection as transmission medium, it is characterized in that:
E. during coal injection, the blast temperature of blast furnace makes the carbonic acid gas zone that is generated by burning in the blast furnace hearth along State of Blast Furnace week uniform distribution between 1000 ℃～2000 ℃.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060008A (en) * | 2013-06-14 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Blast furnace smelting method |
| DE102014216336A1 (en) | 2014-08-18 | 2016-02-18 | Küttner Holding GmbH & Co. KG | Process for injecting replacement reductants into a blast furnace |
| CN110257576A (en) * | 2019-07-18 | 2019-09-20 | 辽宁科技大学 | A kind of reducing is synchronous to couple Blast Furnace Injection device and blowing method |
| CN113151622A (en) * | 2021-04-13 | 2021-07-23 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN113462832A (en) * | 2021-06-04 | 2021-10-01 | 北京科技大学 | Coal injection system for blast furnace ironmaking and use method |
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| JPH03291312A (en) * | 1990-04-06 | 1991-12-20 | Nippon Steel Corp | Method for operating blast furnace |
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast furnace coal injection method using flue gas of hot blast stove as carrier |
| CN101638702A (en) * | 2009-08-14 | 2010-02-03 | 中冶赛迪工程技术股份有限公司 | Recycling method of outlet gas in direct reduction process using gas as reducing gas |
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2010
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Patent Citations (3)
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| JPH03291312A (en) * | 1990-04-06 | 1991-12-20 | Nippon Steel Corp | Method for operating blast furnace |
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast furnace coal injection method using flue gas of hot blast stove as carrier |
| CN101638702A (en) * | 2009-08-14 | 2010-02-03 | 中冶赛迪工程技术股份有限公司 | Recycling method of outlet gas in direct reduction process using gas as reducing gas |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060008A (en) * | 2013-06-14 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Blast furnace smelting method |
| DE102014216336A1 (en) | 2014-08-18 | 2016-02-18 | Küttner Holding GmbH & Co. KG | Process for injecting replacement reductants into a blast furnace |
| WO2016026604A1 (en) | 2014-08-18 | 2016-02-25 | Küttner Holding GmbH & Co. KG | Method for blowing substitute reducing agents into a blast furnace |
| US10472689B2 (en) | 2014-08-18 | 2019-11-12 | Küttner Holding GmbH & Co. KG | Method for blowing substitute reducing agents into a blast furnace |
| CN110257576A (en) * | 2019-07-18 | 2019-09-20 | 辽宁科技大学 | A kind of reducing is synchronous to couple Blast Furnace Injection device and blowing method |
| CN110257576B (en) * | 2019-07-18 | 2024-02-20 | 辽宁科技大学 | Reducing synchronous coupling blast furnace tuyere injection device and injection method |
| CN113151622A (en) * | 2021-04-13 | 2021-07-23 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN113151622B (en) * | 2021-04-13 | 2022-04-01 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN113462832A (en) * | 2021-06-04 | 2021-10-01 | 北京科技大学 | Coal injection system for blast furnace ironmaking and use method |
| CN113462832B (en) * | 2021-06-04 | 2022-04-08 | 北京科技大学 | Coal injection system for blast furnace ironmaking and use method |
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Application publication date: 20120321 |