CN105199806A - Combustion-supporting fire coal additive and use method thereof - Google Patents
Combustion-supporting fire coal additive and use method thereof Download PDFInfo
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- CN105199806A CN105199806A CN201510619379.9A CN201510619379A CN105199806A CN 105199806 A CN105199806 A CN 105199806A CN 201510619379 A CN201510619379 A CN 201510619379A CN 105199806 A CN105199806 A CN 105199806A
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- combustion
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Abstract
The invention relates to a combustion-supporting fire coal additive. The combustion-supporting fire coal additive is prepared by taking steel-making furnace slags as the main raw material through blending and grinding. The combustion-supporting fire coal additive is prepared from, by weight, 13%-20% of FeO, 6%-15% of SiO2, 0.8%-2.5% of Al2O3, 40%-60.0% of CaO, 3.0%-8.0% of MgO, 0-0.8% of S, 0-0.1% of K2O, 0-0.1% of Na2O, 0.1%-1.0% MnO, 0.2%-0.75% of TiO2 and the balance H2O. After the combustion-supporting additive which takes the steel slags as the main raw material and contains all the components is added in combusted pulverized coal, the combustion efficiency of fire coal and the combustion furnace conditions of a blast furnace are both improved.
Description
Technical field
The present invention relates to coal combustion technology field, particularly a kind of converter slag that adopts is combustion-supporting additive for fire coal and the using method thereof of preparation of raw material.
Background technology
Modern blast furnace is smelted need adopt coke, and its effect in blast furnace is to provide the heat that smelting process needs, the reductive agent that reducing iron ore needs, and the skeleton maintaining breathability of stock column for blast furnace.Pulverized coal injection in blast furnace is from the blast-furnace tuyere pulverized anthracite that directly winding-up is levigate in stove or bituminous coal powder or the mixed coal powder of both, play a part to provide heat and reductive agent with substitute for coke, thus reduction coke ratio, reduce pig iron cost, it is the important technical revolution that modern blast furnace is smelted.
Improving constantly along with Coal Injection Rate at BF now, the combustion conditions of coal dust in blast furnace worsens, and efficiency of combustion reduces, and coal-to-coke replacement declines to some extent.Meanwhile, in blast furnace, coal dust firing is insufficient, unburned coal powder can block the hole of stock column in blast furnace, reduces blast furnace permeability, liquid permeability.
Additive for fire coal is a kind of chemical agent made an addition in coal, is made up of one or more materials, is generally pressed powder or liquid, and wherein, the effect of perfect combustion catalyzer mainly promotes the perfect combustion of coal to improve operation of blast furnace, reduces fuel consumption.
Converter slag is the solid waste produced in convertor steelmaking process, and main component is FeO, SiO
2, CaO, nowadays a large amount of converter slags is not effectively disposed and is used, and utilizes converter slag to make coal dust additive, can realize resource circulation utilization, alleviate the destruction to environment simultaneously.
Summary of the invention
Technical problem to be solved by this invention provides a kind of for above-mentioned prior art to adopt converter slag to be raw material, is deployed into combustion-supporting effect good, combustion-supporting additive for fire coal easy to use, improves efficiency of combustion, reduce ironmaking production cost.
Another object of the present invention is to provide the using method of above-mentioned combustion-supporting additive for fire coal.
The present invention's adopted technical scheme that solves the problem is: a kind of combustion-supporting additive for fire coal take copper smelter slag as main raw material, forms, by weight percentage, comprise following component through allotment, grinding:
FeO:13 ~ 20%; SiO
2: 6 ~ 15%; Al
2o
3: 0.8 ~ 2.5%; CaO:40 ~ 60.0%; MgO:3.0 ~ 8.0%; S:0 ~ 0.8%; K
2o:0 ~ 0.1%; Na
2o:0 ~ 0.1%; MnO:0.1 ~ 1.0%; TiO
2: 0.2 ~ 0.75%; H
2o: surplus.
The combustion-supporting additive for fire coal of mentioned component is sent in blast furnace and improves raw coal combustion.
Another object of the present invention is to provide the using method of above-mentioned combustion-supporting additive for fire coal, composition is met the combustion-supporting additive for fire coal of aforementioned proportion and blast furnace raw coal used is mixed in proportion, mixture adopts middling speed shredder grind into powder, then is blown in blast furnace by pulverized coal injection pipeline and coal powder injection chamber.
Preferably, the mixing quality ratio of combustion-supporting additive for fire coal and raw coal is 1.0% ~ 8.0%.
The metal ion contained in perfect combustion catalyzer, can immerse coal intragranular portion and be dispersed among coal grain, increases the activation face of additive, among whole coal grain, forms katalysis.The combustion-supporting additive for fire coal of slag can reduce the point of ignition of coal and accelerate the rate of combustion of coke, can accelerate the fracture of various knot Jie key in pyrolysis of coal process, improve the speed of separating out of coal volatile matter.
Compared with prior art, the invention has the advantages that:
The combustion-supporting additive for fire coal of institute of the present invention determinant take slag as main raw material, slag composition is deleted and mends rear acquisition, main component is FeO, MgO, CaO, additive combustion-supporting effect is good, and the katalysis of part metals composition to coal dust firing in additive makes volatile matter in coal dust more abundant with the burning of fixing point, improves the ventilation property of blast furnace, liquid permeability, enlivens blast furnace hearth, improve coal dust firing thermo-efficiency, contribute to reducing coal combustion consumption.
Slag is the solid waste produced in convertor steelmaking process, and the present invention achieves rationally slag, improves Pulverized Coal and the working of a furnace, can realize resource circulation utilization, alleviates the destruction to environment simultaneously.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
The configuration of combustion-supporting additive for fire coal and using method, take Copper converter smelting slag as main raw material, through pulverizing, after de-iron, composition allotment obtains combustion-supporting additive for fire coal, in table 1, in coal powder injection workshop by setting hopper valve flow value, make coal powder injection additive and coal dust by the part by weight mixing of 1 ~ 8%, grind through coal pulverizer after mixing, fully mix, then the coal dust being mixed with perfect combustion catalyzer is sprayed into blast-furnace roasting through coal spraying pipeline and coal spouting gun.
Test examples:
Test base period is 9 days, and trial period is also 9 day time, and test blast furnace useful volume is 450m
3, blast furnace injecting coal quantity per hour controls at 12 ± 0.005t/h.
The composition (wt%) of table 1 perfect combustion catalyzer, surplus is water
| FeO | SiO 2 | Al 2O 3 | CaO | MgO | S | K 2O | Na 2O | MnO | TiO 2 | |
| Composition 1 | 16.88 | 10.55 | 1.12 | 48.55 | 5.9 | 0.2 | 0.01 | 0.035 | 0.33 | 0.58 |
| Composition 2 | 17 | 10.6 | 1.12 | 48.6 | 5.9 | 0.2 | 0.009 | 0.033 | 0.32 | 0.58 |
| Composition 3 | 16.63 | 10.7 | 1.5 | 48.76 | 5.53 | 0.27 | 0.024 | 0.051 | 0.337 | 0.534 |
| On average | 16.84 | 10.62 | 1.25 | 48.64 | 5.78 | 0.22 | 0.01 | 0.04 | 0.33 | 0.56 |
In base period, coal dust does not add perfect combustion catalyzer, and in trial period, coal dust adds coal powder injection additive (perfect combustion catalyzer composition is in table 1).Under equal blast fumance condition, relative to the fuel ratio in base period, duration of test controls 1 ~ 5% time when the part by weight of perfect combustion catalyzer, and fuel ratio reduces by 5 ~ 10kg/t.Concrete testing data in table 2, table 3.
The fuel consumption of table 2 trial period first time and base period contrasts
| Stage | Coal ratio/kg | Coke ratio/kg | Nut coke ratio/kg | Fuel ratio/kg |
| Base period | 136 | 324 | 63 | 523 |
| Trial period | 138 | 329 | 51 | 518 |
| Contrast | 2 | 5 | 12 | -5 |
The fuel consumption of table 3 second time trial period and base period contrasts
| Stage | Coal ratio/kg | Coke ratio/kg | Nut coke ratio/kg | Fuel ratio/kg |
| Base period | 136 | 324 | 63 | 523 |
| Trial period | 148 | 323 | 43 | 514 |
| Contrast | 12 | 1 | 20 | -9 |
Table 4 blast-furnace slag composition
| Stage | CaO（%） | SiO 2（%） | MgO（%） | Al 2O 3（%） | K 2O （%） | Na 2O（%） | TiO 2（%） | R2 |
| Base period | 40.05 | 34.78 | 8.27 | 13.69 | 0.38 | 0.32 | 0.79 | 1.15 |
| Trial period | 39.82 | 34.59 | 8.52 | 13.8 | 0.39 | 0.33 | 0.77 | 1.15 |
| Contrast | -0.23 | -0.19 | 0.25 | 0.11 | 0.01 | 0.01 | -0.02 | 0 |
As can be seen from Table 4, when crude fuel condition is constant, perfect combustion catalyzer without impact, does not affect smooth operation of furnace to blast furnace slag system.
Table 5 conditions of blast furnace: air quantity, blast, thoroughly to refer to
| Top pressure (kpa) | Air quantity (m 3/min) | Blast (kpa) | Permeability index | |
| Base period | 105 | 1391 | 230 | 11.13 |
| Trial period | 104 | 1382 | 226 | 11.33 |
| Relatively | -1 | -9 | -4 | 0.2 |
Find in experimentation: in the unconverted situation of, material condition constant in basic operation system, ventilation property, the liquid permeability of blast furnace blast furnace improve (see table 5).
What in combusting coal fines, add mentioned component is that after the perfect combustion catalyzer made of main raw material, the efficiency of combustion of coal combustion and the burning working of a furnace of blast furnace are all improved with slag.Mg in slag
2+, Mn
2+, Ti
+, Ca
+deng metal ion, katalysis is played to Pulverized Coal, reduce the point of ignition of coal and accelerate the rate of combustion of coal dust, the fracture of various knot Jie key in pyrolysis of coal process can be accelerated, improve the speed of separating out of coal volatile matter, coal combustion rate is raised, duration of test, in blast furnace material stock post, unburned coal powder amount reduces, proof perfect combustion catalyzer without impact, does not affect smooth operation of furnace to blast furnace slag system, can reach the object of energy Conservation of Blast Furnace consumption reduction.
Claims (4)
1. a combustion-supporting additive for fire coal, is characterized in that: take copper smelter slag as main raw material, forms, by weight percentage, comprise following component through allotment, grinding:
FeO：13～20%；
SiO
2：6～15%；
Al
2O
3：0.8～2.5%；
CaO：40～60.0%；
MgO：3.0～8.0%；
S：0～0.8%；
K
2O：0～0.1%；
Na
2O：0～0.1%；
MnO：0.1～1.0%；
TiO
2：0.2～0.75%；
H
2o: surplus.
2. the using method of combustion-supporting additive for fire coal according to claim 1, is characterized in that: send in blast furnace combustion-supporting by combustion-supporting additive for fire coal.
3. the using method of combustion-supporting additive for fire coal according to claim 2, is characterized in that: combustion-supporting additive for fire coal and blast furnace raw coal used are mixed in proportion, mixture grind into powder is blown in blast furnace.
4. the using method of combustion-supporting additive for fire coal according to claim 3, is characterized in that: the mixing quality ratio of described combustion-supporting additive for fire coal and raw coal is 1.0% ~ 8.0%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107641670A (en) * | 2017-09-29 | 2018-01-30 | 四川德胜集团钒钛有限公司 | A kind of blast furnace smelting method for reducing coke ratio and carrying high-coal ratio |
| CN108504414A (en) * | 2018-05-28 | 2018-09-07 | 马鞍山钢铁股份有限公司 | A kind of combustion adjuvant and application method and device improving blast furnace injection rate of pulverized coal combustion |
| CN112226556A (en) * | 2020-09-23 | 2021-01-15 | 昆明理工大学 | Recycling method of converter steel slag or blast furnace steel slag |
| CN115505660A (en) * | 2022-09-29 | 2022-12-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving combustion rate of blast furnace coal powder injection of vanadium titano-magnetite and quality of molten iron |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107641670A (en) * | 2017-09-29 | 2018-01-30 | 四川德胜集团钒钛有限公司 | A kind of blast furnace smelting method for reducing coke ratio and carrying high-coal ratio |
| CN108504414A (en) * | 2018-05-28 | 2018-09-07 | 马鞍山钢铁股份有限公司 | A kind of combustion adjuvant and application method and device improving blast furnace injection rate of pulverized coal combustion |
| CN112226556A (en) * | 2020-09-23 | 2021-01-15 | 昆明理工大学 | Recycling method of converter steel slag or blast furnace steel slag |
| CN115505660A (en) * | 2022-09-29 | 2022-12-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving combustion rate of blast furnace coal powder injection of vanadium titano-magnetite and quality of molten iron |
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