CN101531943A - Additive suitable for meagre coal and meagre lean coal for blast furnace injection - Google Patents
Additive suitable for meagre coal and meagre lean coal for blast furnace injection Download PDFInfo
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- CN101531943A CN101531943A CN200910076070A CN200910076070A CN101531943A CN 101531943 A CN101531943 A CN 101531943A CN 200910076070 A CN200910076070 A CN 200910076070A CN 200910076070 A CN200910076070 A CN 200910076070A CN 101531943 A CN101531943 A CN 101531943A
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- coal
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- pulverized coal
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Abstract
The invention belongs to the technical field of blast furnace process and relates to an additive suitable for meagre coal and meagre lean coal for blast furnace injection. The additive comprises the components with mass percents as follows: 25-35% of CaO or CaCO3 or Ca(OH)2, 25-35% of MnO2, 25-35% of Fe2O3 and 4-10% of CeO2 or La2O3. The addition method is as follows: the additive is added with pulverized coal through a coalmill belt after being smashed, the additive and the pulverized coal are ground and parched, the addition of the additive is 0.9-4% of the total pulverized coal, the additive and the pulverized coal enter a blast furnace lance via a coal transport pipeline, and the mean grain size of the mixed materials is ensured to be less than 0.074mm during grinding. After being mixed evenly, the additive and the raw pulverized coal can be injected into a blast-furnace tuyere raceway by a pulverized coal jet. The additive has the advantages of safety, reliability and convenient use, which, compared with other additives, can reduce ash content in the pulverized coal, contains no alkali metals or halogen family elements harmful to the blast furnace, such as K, Na, Cl, F and the like, increases the liquidity of the pulverized coal, generates active oxygen and improves pulverized coal combustion rate, thus improving the coal injection rate of the blast furnace and reducing the coke usage.
Description
Affiliated technical field
The invention belongs to technical field of blast furnace process, relate to a kind of additive that is suitable for blast furnace blowing meager coal, meager lean coal, is the promotor of improving blast furnace blowing meager coal, meager lean coal combustionproperty.
Background technology
Blast furnace injection coal should be able to satisfy blast furnace smelting process requirement and favourable to improving winding-up amount and substitution rate, so that substitute more coke.Hard coal has advantages such as fixed carbon height, calorific value height, substitution rate height, security are good, but its reserves are few, and along with coal resources lack, its price constantly raises, and have that kindling temperature height, incendivity are poor, a difficult problem such as unburned coal powder indigestibility in the stove.Bituminous coal has advantages such as kindling temperature is low, incendivity is good, but high volatile volatile bituminous coal explosion hazard is big, and safety features are thrown in big, and easily adheres to slagging scorification on lance head and air port tube wall, and it is bigger than hard coal to recept the caloric, and the heat compensation amount of requirement is more than hard coal.The character of meager coal, meager lean coal is between high volatile volatile bituminous coal and hard coal, have and do not have coking property substantially, volatile matter is slightly higher than hard coal, incendivity and reactive than characteristics such as hard coal are good, in recent years, research and breakthrough along with meager coal, the explosive behavior of meager lean coal, its application in industrial production has become reality, obtained using widely in each big steel enterprise, in order to bring into play meager coal, the meager lean coal combustionproperty in blast-furnace smelting better, the requirement few, low-cost, high efficiency coal-fired promotor of exploitation content is more and more urgent.
At present, the various additive for fire coal of this area use all exist than wretched insufficiency, for example: " CeO
2And La
2O
3Influence to the pulverized coal injection in blast furnace combustion processes " (rare earth, 2005,26 (2): 56-58) literary composition is pointed out, CeO
2And La
2O
3As coal dust incendiary perfect combustion catalyzer under the blast furnace blowing condition, its adding proportion is controlled at about 2% respectively respectively.The rare earth price is expensive, and cost increased when add-on was big.It is 1%～20% of raw coal quality that CN111263A adds ignition dope, add 2%～8% o'clock best, less than 1% DeGrain.This patent add-on is big, not only increases production cost, makes also that ash content increases behind the coal combustion, increases the substitution rate of coke.CN02133147.2 adopts and KMnO
4As additive, its decomposition temperature is 248 ℃, easily produces oxygen in the process of grinding, and has potential safety hazard." iron nitrate is to the kinetic effect of meager lean coal combustion reactions " (2007,32 (10): 1084-1087) literary composition is mentioned and is adopted iron nitrate as combustion improver, it easily bonds in the process of grinding, reduced the flowability of coal dust, and its decomposition temperature is at 383 ℃, grinds also to have potential safety hazard in the process." effect of ignition dope in pulverized coal injection " (modern metallurgical, 2001, (2): 27-29) literary composition and CN02133147.2, CN90106347.9, CN01138848.x etc. all contain K, Na, Cl etc., cause the blast furnace alkali load to increase, and smelting is brought disadvantageous effect." the blast furnace coal dust is mixed the experimental study of additive " (2000,21 (1): 7-11) literary composition proposes to adopt MnO
2, MgCO
3, MgCl
2, MnCO
3, CaF
2As additive, be added in hard coal and the bituminous coal, effect is with CaF
2Best, and addition reaches 5%, life-time service causes the body of heater seriously corroded, and the smelting process ash content increases, and reduces coke replacement ratio.
Sum up present this area additive for fire coal performance and effect, main drawback is as follows:
(1) consumption is big.Generally account for 2%～20% of coal suitable for blowing total amount, increased the ash content of coal dust, reduced the substitution rate of coke;
(2) price is expensive.Generally contain more precious material in the additive, CeO as 2%
2, La
2O
3Deng rare earth;
(3) long-time running has infringement to blast furnace.As add a large amount of basic metal (K, Na) or haloid element (F, Cl), and corrode body of heater on the one hand, can increase the weight of the blast furnace alkali load on the other hand.
(4) potential safety hazard is arranged.As KMnO
4, Fe (NO
3)
3Deng, in coal powder grinding, mixing and course of conveying, easily produce oxygen, there is safety hazard.
Summary of the invention
The objective of the invention is to seek a kind of economy, safety, can improve the additive of blast furnace blowing with meager coal, meager lean coal rate of combustion, reduce the ash content of coal dust, do not contain K, Na, Cl, F etc. to deleterious basic metal of blast furnace and haloid element, increase the flowability of coal dust, produce active oxygen, improve coal combustion rate, thereby improve the pulverized coal injection ratio, reduce the coke consumption.
A kind of additive that is suitable for blast furnace blowing meager coal, meager lean coal, the additive component mass percent is: CaO or CaCO
3Or Ca (OH)
2: 25%～35%, MnO
2: 25%～35%, Fe
2O
3: 25%～35%, CeO
2Or La
2O
3: 4%～10%.
CaO or CaCO as mentioned above
3Or Ca (OH)
2Can be with MgO or MgCO
3Replace MgO or MgCO
3Accounting for mass percentage content in additive is 25%～38%.
Optimize angle from each additive combination and consider CaCO
3, CeO
2, MnO
2, Fe
2O
3Combination is optimum, is CaCO secondly
3, La
2O
3, MnO
2, Fe
2O
3With CaO, CeO
2, MnO
2, Fe
2O
3
Additive can be processed by dual mode, and is a kind of for respectively each additive being worn into below the 74 μ m (200 order), mixes mechanically again; It is another kind of for each additive is worn into below the 74 μ m (200 order) simultaneously.Two kinds of mixed effects are suitable, can determine according to practical situation.
The adding mode of additive is among the present invention, to be added on coal dust by the coal pulverizer belt after the additive fragmentation, the additive add-on is the 0.9-4% of coal dust gross weight, grinds, dries with coal dust, enter the blast furnace spray gun through convey coal pipe, implement the coal powder injection operation.It is more important to grind link among the present invention, must guarantee that the batch mixing mean particle size is less than 0.074mm (200 order).Need among the present invention at least two kinds of transition group metallic oxides and a kind of rare earths oxide are mixed, transition group metallic oxide or rare earths oxide effect are relatively poor separately.Middle-weight rare earths oxide compound of the present invention is with CeO
2, La
2O
3Preferentially, CeO among both
2Preferentially, can add two kinds simultaneously, also can add a certainly, but total amount can not surpass 10% of additive total amount.
At hot blast temperature is 1100 ℃, and 1400 ℃ of furnace temperatures, oxygen enrichment percentage are under 1% the condition, and the short combustion of heterogeneity proportioning additive effect is as follows:
La
2O
35%, CaCO
335%, MnO
230%, Fe
2O
330%, the additive total amount is 3% o'clock, and coal combustion rate improves 5.13%; CeO
25%, CaCO
335%, MnO
230%, Fe
2O
330%, the additive total amount is 2.5%, and coal combustion rate improves 7.54%; CeO
210%, CaO 30%, MnO
230%, Fe
2O
330%, the additive total amount is 1%, and coal combustion rate improves 5.12%,
Additive of the present invention can be behind raw material coal dust mixing sprays into the blast-furnace tuyere place, district of circling round by pulverized coal gun, has advantage safe and reliable, easy to use, can reduce the ash content of coal dust than other additive, do not contain K, Na, Cl, F etc. to deleterious basic metal of blast furnace and haloid element, increase the flowability of coal dust, produce active oxygen, improve coal combustion rate, thereby improve the pulverized coal injection ratio, reduce the coke consumption.
Description of drawings
Fig. 1 is a technological process synoptic diagram of the present invention;
Among Fig. 1: 1. blast furnace; 2. spray gun; 3. the district of circling round, air port
Embodiment
The invention process example is realized by Institutes Of Technology Of Hebei's coal dust furnace, this testing apparatus analog blast furnace air port combustion conditions, add warm air with two sections horizontal electric furnace simulation hotblast stoves, coal dust firing situation with roasting kiln analog blast furnace air port, to carry out the mensuration of coal combustion rate through in the exsiccant coal dust spirt roasting kiln.The virtual condition that the condition of coal dust firing test is produced according to blast furnace determines that hot blast temperature is controlled to be 1100 ℃, and furnace temperature is controlled at 1400 ℃, and hot air flow is 12Nm
3/ h, oxygen enrichment percentage is controlled to be 1%, and cold wind pressure is 0.2MPa.The gas of pulverized coal conveying is freezing air, and the gaseous tension of pulverized coal conveying is identical with cold wind pressure, is 0.2MPa.Resistates behind the coal dust firing is collected and suction filtration with soot collector, then to unburned coal powder weigh, assay and calculate the rate of combustion of coal dust.
Verify by six kinds of components:
(1) La
2O
35%, CaCO
335%, MnO
230%, Fe
2O
330%, additive accounts for 1% of total amount, is made as the 1# additive;
(2) CeO
25%, CaCO
335%, MnO
230%, Fe
2O
330%, additive accounts for 1% of total amount, is made as the 2# additive;
(3) CeO
25%, CaO 30%, MnO
230%, Fe
2O
330%, additive accounts for 1% of total amount, is made as the 3# additive;
(4) do not add any additives, be raw coal, be made as the 4# additive.
(5) La
2O
35%, MgO 35%, MnO
230%, Fe
2O
330%, additive accounts for 1% of total amount, is made as the 5# additive;
(6) CeO
25%, MgCO
335%, MnO
230%, Fe
2O
330%, additive accounts for 1% of total amount, is made as the 6# additive;
Test-results: the raw coal combustion rate is 47.43%, and 2# is 54.97%, and 1# is 52.56%, and 3# is 52.15%, and 5# is 52.42%, and 6# is 52.86%.Average raising 5%.
Claims (4)
1. an additive that is suitable for blast furnace blowing meager coal, meager lean coal is characterized in that the additive component mass percent is: CaO or CaCO
3Or Ca (OH)
2: 25%～35%, MnO
2: 25%～35%, Fe
2O
3: 25%～35%, CeO
2Or La
2O
3: 4%～10%.
2. a kind of according to claim 1 additive that is suitable for blast furnace blowing meager coal, meager lean coal is characterized in that with MgO or MgCO
3Replaced C aO or CaCO
3Or Ca (OH)
2, MgO or MgCO
3Accounting for mass percentage content in additive is 25%～38%.
3. a kind of as claimed in claim 1 or 2 additive that is suitable for blast furnace blowing meager coal, meager lean coal is characterized in that additive processes by dual mode, and is a kind of for respectively each additive being worn into below the 74 μ m, mixes mechanically again; It is another kind of for each additive is worn into below the 74 μ m simultaneously.
4. as a kind of additive that is suitable for blast furnace blowing meager coal, meager lean coal as described in the claim 3, the adding mode that it is characterized in that additive is, to be added on coal dust by the coal pulverizer belt after the additive fragmentation, the additive add-on is the 0.9-4% of coal dust gross weight, grind, dry with coal dust, enter the blast furnace spray gun through convey coal pipe, implement the coal powder injection operation; Grind link among the present invention, must guarantee that the batch mixing mean particle size is less than 0.074mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910076070A CN101531943A (en) | 2009-01-06 | 2009-01-06 | Additive suitable for meagre coal and meagre lean coal for blast furnace injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910076070A CN101531943A (en) | 2009-01-06 | 2009-01-06 | Additive suitable for meagre coal and meagre lean coal for blast furnace injection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101531943A true CN101531943A (en) | 2009-09-16 |
Family
ID=41102811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910076070A Pending CN101531943A (en) | 2009-01-06 | 2009-01-06 | Additive suitable for meagre coal and meagre lean coal for blast furnace injection |
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|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935572A (en) * | 2010-09-25 | 2011-01-05 | 重庆大学 | Composite additive for spraying coal into blast furnace |
| CN102297606A (en) * | 2011-07-21 | 2011-12-28 | 宋群 | Coke-saving precast optimization control system for coke put into furnace |
| CN103406020A (en) * | 2013-03-01 | 2013-11-27 | 华北电力大学（保定） | Additive for flue gas desulfurization and denitration and flue gas desulfurization and denitration method |
| CN103451333A (en) * | 2013-09-04 | 2013-12-18 | 武钢集团昆明钢铁股份有限公司 | Blast furnace coal injection accelerant as well as preparation method and application thereof |
| CN105289267A (en) * | 2015-11-23 | 2016-02-03 | 内蒙古科技大学 | Desulfurization denitration agent for fire coal and preparation method thereof |
| CN106154868A (en) * | 2015-03-26 | 2016-11-23 | 上海梅山钢铁股份有限公司 | A kind of blast-furnace tuyere coke size hierarchical control method |
| WO2018121045A1 (en) * | 2016-12-30 | 2018-07-05 | 王铨寿 | Batching method of blowing material |
| CN114769266A (en) * | 2022-03-02 | 2022-07-22 | 昆明理工大学 | Method for preparing mixed fuel of waste plastics and coal powder injected into blast furnace and injection method thereof |
-
2009
- 2009-01-06 CN CN200910076070A patent/CN101531943A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935572A (en) * | 2010-09-25 | 2011-01-05 | 重庆大学 | Composite additive for spraying coal into blast furnace |
| CN102297606A (en) * | 2011-07-21 | 2011-12-28 | 宋群 | Coke-saving precast optimization control system for coke put into furnace |
| CN102297606B (en) * | 2011-07-21 | 2013-11-06 | 宋群 | Coke-saving precast optimization control system for coke put into furnace |
| CN103406020A (en) * | 2013-03-01 | 2013-11-27 | 华北电力大学（保定） | Additive for flue gas desulfurization and denitration and flue gas desulfurization and denitration method |
| CN103406020B (en) * | 2013-03-01 | 2018-01-26 | 华北电力大学（保定） | Additive and a kind of method of flue gas desulfurization and denitrification for flue gas desulfurization and denitrification |
| CN103451333A (en) * | 2013-09-04 | 2013-12-18 | 武钢集团昆明钢铁股份有限公司 | Blast furnace coal injection accelerant as well as preparation method and application thereof |
| CN103451333B (en) * | 2013-09-04 | 2015-07-22 | 武钢集团昆明钢铁股份有限公司 | Blast furnace coal injection accelerant as well as preparation method and application thereof |
| CN106154868A (en) * | 2015-03-26 | 2016-11-23 | 上海梅山钢铁股份有限公司 | A kind of blast-furnace tuyere coke size hierarchical control method |
| CN105289267A (en) * | 2015-11-23 | 2016-02-03 | 内蒙古科技大学 | Desulfurization denitration agent for fire coal and preparation method thereof |
| WO2018121045A1 (en) * | 2016-12-30 | 2018-07-05 | 王铨寿 | Batching method of blowing material |
| CN114769266A (en) * | 2022-03-02 | 2022-07-22 | 昆明理工大学 | Method for preparing mixed fuel of waste plastics and coal powder injected into blast furnace and injection method thereof |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Rensheng Inventor after: Liu Yingshu Inventor after: Cao Chenzhong Inventor after: Fang Lianzeng Inventor after: Li Wenjun Inventor after: Wu Xiaojun Inventor after: Zhang Hui Inventor after: Sun Xiaodong Inventor after: Lou Lihong Inventor before: Liu Rensheng Inventor before: Liu Yingshu Inventor before: Li Wenjun Inventor before: Fang Lianzeng Inventor before: Wu Xiaojun Inventor before: Sun Xiaodong Inventor before: Lou Lihong Inventor before: Zhang Hui |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LIU RENSHENG LIU YINGSHU LI WENJUN FANG LIANZENG WU XIAOJUN SUN XIAODONG LOU LIHONG ZHANG HUI TO: LIU RENSHENG LIU YINGSHU CAO CHENZHONG FANG LIANZENG LI WENJUN WU XIAOJUN ZHANG HUI SUN XIAODONG LOU LIHONG |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20090916 |