CN205170892U - Coal -based reduction iron -smelting device and coal -based reduction iron -smelting system - Google Patents
Coal -based reduction iron -smelting device and coal -based reduction iron -smelting system Download PDFInfo
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- CN205170892U CN205170892U CN201520947527.5U CN201520947527U CN205170892U CN 205170892 U CN205170892 U CN 205170892U CN 201520947527 U CN201520947527 U CN 201520947527U CN 205170892 U CN205170892 U CN 205170892U
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Abstract
The utility model relates to a coal -based reduction iron -smelting device, including a combustion chamber and at least one reduction room, each room of reduction equal vertical wear to locate the combustion chamber on, the combustion chamber with the upper portion of each reduction room enclose locate it in, each restores roof portion and all is equipped with the charge door, and the bottom all is equipped with the bin outlet. Still relate to a coal -based reduction iron -smelting system in addition, adopt as above coal -based reduction iron -smelting device. Through setting up the upper portion of combustion chamber corresponding to each reduction room, going on of direct reduction reaction is realized on reduction room upper portion, and the heat preservation slow cooling of reduction pelletizing is realized to reduction room lower part, can one step of production reduction abrasive grit, reduce combustion chamber building volume simultaneously, practice thrift the capital construction cost, the coal gas that the reduction room produced can be introduced and burn in the combustion chamber, and through adjusting the raw materials ratio, that realizes the direct reduction process produces effective reduction in production cost from the heat supply.
Description
Technical field
The utility model belongs to Direct Reduction Technology field, relates to a kind of coal base reduction iron-smelting device and a kind of coal base reduction ironmaking system.
Background technology
Direct-reduced iron (DRI) be sponge iron again, formed after reductive agent reducing iron ore, Iron concentrate or iron-bearing material using Sweet natural gas or mill coal.Along with smelting steel grade requires more and more tighter to residual element, particularly the product steel such as nuclear power, hydrogenation, power station, when using common home scrap and outsourcing scrap smelting, can not meet the requirement of product to residual element.Direct-reduced iron is very low because of its impurity content, is commonly used to replace the residual element problem in part steel scrap solution steelmaking process, production high-quality Clean Steel or special steel in steel-making.Global direct-reduced iron sustained production increases in recent years, according to statistics, 2010 world's direct-reduced iron (DRI/HBI) output reached 7,037 ten thousand t, be about China's blase furnace cast iron output (9.52 hundred million t) 6.7%, by the restriction of resource, the slower development that China's direct-reduced iron is produced, output is less than 1.0% of global direct-reduced iron (DRI) output.
Gas-based reduction and coal base reduction is divided into by the different direct-reductions of reductive agent.But no matter adopting which kind of direct reduction iron making technique at present, the product produced is the sponge iron containing gangue, cannot directly power supply stove or converter use.For addressing this problem, after Direct Reducing Iron Process, usually joining submerged arc furnace (SAF), for electric furnace provides without slag molten iron, which not only adds submerged arc furnace investment, too increasing energy consumption simultaneously.ITmk3 technology produces by interior coal blending pelletizing direct-reduction process the abrasive grit be separated with acid gangue in rotary hearth furnace, but ITmk3 technology must adopt high grade iron concentrate, and there is melting acid gangue and cohere furnace lining problem.
Utility model content
The utility model embodiment provides a kind of coal base reduction iron-smelting device and a kind of coal base reduction ironmaking system, at least can solve the segmental defect of prior art.
The utility model embodiment relates to a kind of coal base reduction iron-smelting device, and comprise a combustion chamber and at least one reduction room, each described reduction room is all vertically arranged on described combustion chamber, and the top of each described reduction room encloses in the inner by described combustion chamber; Top, each described reduction room is equipped with charging opening, is equipped with discharge gate bottom each described reduction room.
As one of embodiment, described combustion chamber furnace wall is circumferentially provided with multiple burner, and each described burner is all by gas main and combustion air house steward air feed; Each described reduction room is equipped with gas exit, and each described gas exit is all positioned at above described combustion chamber, and each described gas exit is all communicated with described gas main by branch gas tube.
As one of embodiment, each described branch gas tube is all connected to gas dust remover, and the exit end of described gas dust remover is connected with described gas main.
As one of embodiment, the thermal conductivity of bottom, described reduction room furnace wall refractory materials is low compared with the thermal conductivity of top furnace wall refractory materials.
As one of embodiment, the horizontal section of each described reduction room is rounded or square.
The utility model embodiment relates to a kind of coal base reduction ironmaking system, the screening mechanism comprising ingredient sector, restoring component and gangue is separated with reduction abrasive grit, described restoring component comprises coal base reduction iron-smelting device as above, described ingredient sector is connected with described coal base reduction iron-smelting device by green-ball batch can, and the quantity of described green-ball batch can and one_to_one corresponding identical with the quantity of described reduction room is located at the top of each described reduction room.
As one of embodiment, described ingredient sector comprises mixing machine and ball press, and described mixing machine is connected with powdered iron ore feed bin, coal dust feed bin and auxiliary material feed bin.
As one of embodiment, described combustion chamber is provided with waste gas outlet, and described waste gas outlet is connected to described ingredient sector by exhaust pipeline and carries out drying and preheating to made green-ball.
The utility model embodiment at least achieves following beneficial effect: by being arranged on the top of combustion chamber corresponding to each reduction room, reduction indoor are made to form reduction section and cooling section from top to bottom, reduction top, room realizes the carrying out of direct reduction reactor, reduction bottom, room realizes the insulation slow cooling of reducting pellet, a step can produce reduction abrasive grit; Reduce combustion chamber architectural volume simultaneously, save capital construction cost; Configuration reduction number of chambers amount and combustion chamber area can be needed according to production capacity, be convenient to expand the scale of production.
The further beneficial effect of the utility model embodiment is: the coal gas that reduction room produces can be introduced into combustion chamber combustion, by regulating proportioning raw materials, realizing producing from heat supply of Direct Reduction, effectively reducing production cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The main TV structure schematic diagram of the coal base reduction iron-smelting device that Fig. 1 provides for the utility model embodiment;
The plan structure schematic diagram of the coal base reduction iron-smelting device that Fig. 2 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope of the utility model protection.
embodiment one
As Fig. 1-Fig. 2, the utility model embodiment provides a kind of coal base reduction iron-smelting device, comprise a combustion chamber 2 and at least one reduction room 1, each described reduction room 1 is all vertically arranged on described combustion chamber 2, and the top of each described reduction room 1 encloses in the inner by described combustion chamber 2; Top, each described reduction room 1 is equipped with charging opening, is equipped with discharge gate bottom each described reduction room 1.The horizontal section of each described reduction room 1 is rounded or square, is preferably circular, to improve the temperature homogeneity in radially each region in reduction room 1, thus improves the homogeneity of reduction reaction.Described combustion chamber 2 furnace wall is circumferentially provided with multiple burner 3, and each described burner 3, all by gas main 5 and combustion air house steward 6 air feed, produces heat by gas-fired in combustion chamber 2 and provides direct reduction reactor institute heat requirement for each reduction room 1; For the homogeneity ensureing that in each reduction room 1, reduction reaction is carried out, to ensure the greater homogeneity of product, each reduction room 1 becomes arranged in arrays in combustion chamber 2, certainly, can respectively reduce the discharge velocity of room 1 according to reacting in each reduction room 1 extent control carried out, the discharge velocity that the discharge velocity as each reduction room 1 near combustion chamber 2 furnace wall comparatively can be positioned at the reduction room 1 of combustion chamber 2 central region is fast.
Continue the structure of above-mentioned coal base reduction iron-smelting device, and each described reduction room 1 is equipped with gas exit, and each described gas exit is all positioned at above described combustion chamber 2; As preferably, each described gas exit is all communicated with described gas main 5 by branch gas tube, and the coal gas that each reduction room 1 produces is introduced into combustion chamber 2 combustion, for follow-up direct reduction reactor provides heat.Further, each described branch gas tube is all connected to gas dust remover, the exit end of described gas dust remover is connected with described gas main 5, namely combustion chamber 2 combustion is fed through again after dedusting being carried out to the coal gas of drawing in reduction room 1, can combustion efficacy be improved, ensure the work-ing life of combustion chamber 2 burner 3; Gas dust remover adopts existing fly-ash separator, as tornado dust collector etc.
Continue the structure of above-mentioned coal base reduction iron-smelting device, and the thermal conductivity of bottom, described reduction room 1 furnace wall refractory materials is low compared with the thermal conductivity of top furnace wall refractory materials; Namely top, room 1 furnace wall that reduces adopts the refractory material laying that heat-conductive characteristic is good, to improve the heat-transfer effect between combustion chamber 2 and reduction room 1, improve reduction reaction speed, reduction bottom, room 1 furnace wall adopts common refractory material laying, carries out insulation slow cooling to the pelletizing after reduction reaction.
embodiment two
The utility model embodiment relates to a kind of coal base reduction ironmaking system, the screening mechanism comprising ingredient sector, restoring component and gangue is separated with reduction abrasive grit, described restoring component comprises the coal base reduction iron-smelting device provided in embodiment one, and concrete structure repeats no more herein.Described ingredient sector is connected with described coal base reduction iron-smelting device by green-ball batch can 4, and the quantity of described green-ball batch can 4 and one_to_one corresponding identical with the quantity of described reduction room 1 is located at the top of each described reduction room 1.Described ingredient sector comprises mixing machine and ball press, and described mixing machine is connected with powdered iron ore feed bin, coal dust feed bin and auxiliary material feed bin, and the green-ball globule size that ball press is suppressed is within the scope of 10 ~ 40mm.Coal base reduction iron-smelting device is connected with screening mechanism by rotary conveyor, the furnace charge of being discharged by reduction room 1 cools concurrent fecula gradually in rotary conveyor course of conveying, gangue is separated with reduction abrasive grit, by screening mechanism, the two separation can be obtained reducing abrasive grit; Screening mechanism adopts existing screening plant.
Further, described combustion chamber 2 is provided with waste gas outlet, and described waste gas outlet is connected to described ingredient sector by exhaust pipeline and carries out drying and preheating to made green-ball, can make full use of the waste heat of combustion exhaust, further save energy.
embodiment three
The present embodiment relates to coal base reduction iron-smelting process, and be specially the method adopting the coal base reduction ironmaking system described in above-described embodiment two to carry out reduction iron production, implementation step is as follows:
1) prepare burden: powdered iron ore, coal dust and auxiliary material (comprising binding agent, external feeding) are prepared burden in proportion, mixing machine mixes, it is 1:1.1 ~ 1:1.2 that blending process controls carbon oxygen mol ratio in raw material; Be sent to ball press and be pressed into green-ball, green-ball granularity is within the scope of 10 ~ 40mm, and green-ball gangue basicity controls 2 ~ 3; Carrying out drying treatment to green-ball, is less than 1% by moisture controlled in green-ball, and the green-ball after dried wraps one deck coal dust.
2) green-ball of drying is added in each reduction room 1 by green-ball batch can 4 reduce: each reduction room 1, by combustion chamber 2 heat supply, to control in reduction room 1 temperature more than 1350 DEG C; Green-ball runs from top to bottom in reduction room 1, and is gradually heated by the sonochemical activity, and carbon dust and powdered iron ore generation reduction reaction in green-ball, powdered iron ore is reduced gradually, CaO and the SiO in gangue
2at high temperature form Calucium Silicate powder slag (2CaOSiO by solid state reaction
2).The coal gas that reduction process produces moves upward, and discharges outside reduction room 1, introduces combustion chamber 2 combustion, reach the object from heat supply after dedusting.
3) slow cooling: reduction furnace charge enters reduction bottom, room 1, is slowly cooled; Due to 2CaOSiO
2instability, undergoes phase transition in the annealing process of reduction bottom, room 1, generates 2CaOSiO
2variant.
4) discharge: reduction furnace charge discharges each reduction room 1 slowly cool to about 670 DEG C in reduction room 1 after.
5) sieve: reduction furnace charge is discharged on rotary conveyor, cools gradually, above-mentioned 2CaOSiO in transportation
2variant generation volumetric expansion and efflorescence, gangue is separated with reduced iron, finally carries out screening to it and obtains reducing abrasive grit.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. a coal base reduction iron-smelting device, is characterized in that: comprise a combustion chamber and at least one reduction room, each described reduction room is all vertically arranged on described combustion chamber, and the top of each described reduction room encloses in the inner by described combustion chamber; Top, each described reduction room is equipped with charging opening, is equipped with discharge gate bottom each described reduction room.
2. coal base reduction iron-smelting device according to claim 1, is characterized in that: described combustion chamber furnace wall is circumferentially provided with multiple burner, and each described burner is all by gas main and combustion air house steward air feed; Each described reduction room is equipped with gas exit, and each described gas exit is all positioned at above described combustion chamber, and each described gas exit is all communicated with described gas main by branch gas tube.
3. coal base reduction iron-smelting device according to claim 2, is characterized in that: each described branch gas tube is all connected to gas dust remover, and the exit end of described gas dust remover is connected with described gas main.
4. coal base reduction iron-smelting device according to claim 1, is characterized in that: the thermal conductivity of bottom, described reduction room furnace wall refractory materials is low compared with the thermal conductivity of top furnace wall refractory materials.
5. coal base reduction iron-smelting device according to claim 1, is characterized in that: the horizontal section of each described reduction room is rounded or square.
6. a coal base reduction ironmaking system, it is characterized in that: the screening mechanism comprising ingredient sector, restoring component and gangue is separated with reduction abrasive grit, described restoring component comprises the coal base reduction iron-smelting device according to any one of claim 1 to 5, described ingredient sector is connected with described coal base reduction iron-smelting device by green-ball batch can, and the quantity of described green-ball batch can and one_to_one corresponding identical with the quantity of described reduction room is located at the top of each described reduction room.
7. coal base reduction ironmaking system according to claim 6, is characterized in that: described ingredient sector comprises mixing machine and ball press, described mixing machine is connected with powdered iron ore feed bin, coal dust feed bin and auxiliary material feed bin.
8. the coal base reduction ironmaking system according to claim 6 or 7, is characterized in that: described combustion chamber is provided with waste gas outlet, and described waste gas outlet is connected to described ingredient sector by exhaust pipeline and carries out drying and preheating to made green-ball.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106916599A (en) * | 2017-02-08 | 2017-07-04 | 中冶南方工程技术有限公司 | A kind of iron coke process units and method |
| CN107190116A (en) * | 2017-07-07 | 2017-09-22 | 中冶南方工程技术有限公司 | A kind of regenerative combustion type coal base shaft furnace and a kind of direct-reduction production method |
| CN108467913A (en) * | 2018-04-13 | 2018-08-31 | 中冶焦耐(大连)工程技术有限公司 | A kind of ultra-large volume coal base upright furnace producing direct reduced iron |
-
2015
- 2015-11-25 CN CN201520947527.5U patent/CN205170892U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106916599A (en) * | 2017-02-08 | 2017-07-04 | 中冶南方工程技术有限公司 | A kind of iron coke process units and method |
| CN107190116A (en) * | 2017-07-07 | 2017-09-22 | 中冶南方工程技术有限公司 | A kind of regenerative combustion type coal base shaft furnace and a kind of direct-reduction production method |
| CN107190116B (en) * | 2017-07-07 | 2023-02-24 | 中冶南方工程技术有限公司 | Regenerative combustion type coal-based shaft furnace and direct reduction production method |
| CN108467913A (en) * | 2018-04-13 | 2018-08-31 | 中冶焦耐(大连)工程技术有限公司 | A kind of ultra-large volume coal base upright furnace producing direct reduced iron |
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