CN104748558B - Tailing preheating device of reduction kiln - Google Patents
Tailing preheating device of reduction kiln Download PDFInfo
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- CN104748558B CN104748558B CN201310740482.XA CN201310740482A CN104748558B CN 104748558 B CN104748558 B CN 104748558B CN 201310740482 A CN201310740482 A CN 201310740482A CN 104748558 B CN104748558 B CN 104748558B
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- tail coal
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Abstract
The invention discloses a tailing preheating device of a reduction kiln. The tailing preheating device comprises a preheating chamber (1), a smoke collection chamber (2) and a smoke extractor (3). The preheating chamber (1) is arranged on an outlet side of a preheating segment of a chain grate (4); space for containing kiln tailing is arranged inside the preheating chamber (1), a smoke inlet is formed in the front side of the preheating chamber (1), a smoke outlet is formed in the rear side of the preheating chamber (1), and the discharging end at the bottom of the preheating chamber (1) is located above a grid plate of the chain grate (4) and provided with a kiln tailing discharging device; the smoke collection chamber (2) is located on the rear side of the preheating chamber (1) and is communicated with the preheating chamber (1) through the smoke outlet; the smoke extractor (3) is arranged outside the smoke collection chamber (2) and used for extracting smoke in the smoke collection chamber (2). According to the preheating device, the kiln tailing preheating chamber is arranged on the preheating segment of the chain grate, and part of high-temperature smoke discharged by the tail of a reduction kiln is utilized for heating the kiln tailing; a heating device does not need to be additionally arranged, and energy can be effectively saved; running cost is reduced, and the device is compact in structure and reasonable in layout; and a utilization coefficient of kiln capacity is improved.
Description
Technical field
The present invention relates to smelting equipment technical field, carry out hyperthermic treatment especially for the tail coal entering reduction kiln
Preheating device.
Background technology
Direct-reduction process in non-blast furnace process ironmaking refers to, under less than fusion temperature, reduction of iron ore is become sponge iron
Iron-making production, its product be DRI (i.e. dri), also referred to as sponge iron.Sponge iron, without fusing, still keeps Ore
Profile, because reduction oxygen loss forms a large amount of pores, the group of examining under a microscope is similar to sponge and gains the name, and is characterized in that carbon containing is low
(＜ 1%), and save the stone-like pulse in Ore.
Direct-reduction process divides gas base method and coal base method two big class, and the former is to be made with cracked output h2 of natural gas and co gas
For reducing agent, in shaft furnace, pot type burner or fluid bed, the ferrum oxide in iron ore is reduced into sponge iron, the latter is to be gone back with coal
Former dose, in the equipment such as rotary kiln, tunnel cave, the ferrum oxide in iron ore is reduced.
Taking the middle smelting vast of heaven " one-step method " direct-reduction technique as a example, it is coal base method, pre- including concentrate pelletizing-drying grate
The steps such as heat-coal base kiln reduction-cooling cylinder cooling, in process of production, green-ball enters drying grate from disk or pelletising drum,
Drying grate is dried and preheats, when reaching some strength, the green-ball after preheating is directly entered rotary kiln, one
Solid reductant is divided to enter rotary kiln, abbreviation kiln tail coal from afterbody together with the green-ball after the preheating of drying grate delivery end, remaining is solid
Body reducing agent adds from rotary kiln head, abbreviation kiln hood coal, and furnace charge is in reverse movement with furnace gas, and in motor process, furnace charge exists
Preheating section is heated, and makes moisture evaporation and decomposition of limestone, after reaching 800 DEG C, the solid carbon in coal starts in reducing iron ore
Ferrum oxide, until obtaining sponge iron, and carbon is then transformed into co gas, and co is combusted into co2 in zoneofoxidation, releases heat with full
The requirement of sufficient reduction reaction, product discharge rotary kiln after enter revolution cooling cylinder cooling obtain sponge iron, also can hot power transmission stove straight
Connect steel-making.
Refer to Fig. 1, Fig. 1 is the feed postition schematic diagram of kiln tail coal in prior art.
As illustrated, in the delivery end of drying grate 1 ＇, being provided with kiln tail coal chute 2 ＇, kiln tail coal directly passes through feeding chute
Green-ball after 2 ＇ and preheating mixes and enters rotary kiln 3 ＇, wherein about 900～950 DEG C of drying grate 1 ＇ preheating section furnace temperature, preheating
Green-ball temperature, at 800 DEG C～850 DEG C about, is mixed with a large amount of kiln tail coals to apply base to enter kiln afterwards, can cause to preheat
Ball temperature reduces suddenly, the phenomenon such as preheating ball fractured, ring formation.
In this regard, those of ordinary skill is it is contemplated that carry out to the tail coal that will enter rotary kiln adding using heater
Heat, to improve the temperature of kiln tail coal, reduces the temperature difference of kiln tail coal and green-ball.But, so can consume extra fuel, run into
This is higher, and if structure design is unreasonable, equipment can be led to very numerous and jumbled.
Therefore, how to improve the preheating method of kiln tail coal, be those skilled in the art's technical issues that need to address.
Content of the invention
It is an object of the invention to provide a kind of reduction kiln tail coal preheating device.This preheating device exports in drying grate preheating section
Side is provided with kiln tail coal preheating chamber, and using the part high-temperature flue gas that reduction kiln afterbody is discharged, kiln tail coal is heated, without volume
Set up heater outward, can the effectively save energy, reduce operating cost, and compact conformation, rationally distributed, be conducive to improving kiln and hold
Usage factor.
For achieving the above object, the present invention provides a kind of reduction kiln tail coal preheating device, comprising:
Preheating chamber, located at drying grate preheating section outlet side；
For accommodating the space of kiln tail coal inside described preheating chamber, front side is provided with smoke inlet, and rear side is provided with exhanst gas outlet, bottom
The exhaust end in portion is located above the grate plate of drying grate and is provided with kiln tail coal discharge device；
Fume collection room, on rear side of described preheating chamber, and is connected with preheating chamber by described exhanst gas outlet；
Smoke extractor, outside described fume collection room, for extracting the flue gas of fume collection interior.
Preferably, the front side of described preheating chamber is provided with air intake grate plate, forms described smoke inlet；The rear side of described preheating chamber
It is provided with air-out grate plate, form described exhanst gas outlet.
Preferably, described preheating chamber extends to inside burner hearth from above through the roof of the furnace of described drying grate.
Preferably, the width of described preheating chamber and height and the furnace width of described drying grate and highly consistent.
Preferably, the front side of described preheating chamber exhaust end is provided with the baffle plate of forward downward extension.
Preferably, located at described fume collection ceiling portion, its outlet flue leads to secondary combustion chamber to described smoke extractor.
Preferably, described fume collection room bottom is provided with unloading valve.
Preferably, described preheating chamber is located between drying grate preheating section and great wheel.
Preferably, described preheating chamber is located at kiln exit gas outlet and the drying grate front side that reduction kiln leads to secondary combustion chamber
Preheating section hot-wind inlet between.
Preferably, described discharge device is the resistance to heat shield of water-cooling shaft.
The present invention sets kiln tail coal preheating chamber in drying grate preheating section outlet side, the high-temperature flue gas part discharged from reduction kiln
Lead directly to secondary combustion chamber, another part shunts under the swabbing action of smoke extractor, and the smoke inlet on front side of preheating chamber enters
Enter inside preheating chamber, to preheating, indoor kiln tail coal heats, after completing heat exchange, the flue gas that temperature reduces is from preheating chamber
The exhanst gas outlet of rear side enters fume collection room, then discharges fume collection room by smoke extractor.By preheating to kiln tail coal,
Can improve and enter kiln temperature degree into kiln material, make reduction reaction in kiln for the green-ball do sth. in advance to occur, it is to avoid pre- hot-bulb successively weares and teares efflorescence
Phenomenon, is solved prior art kiln tail coal to apply base state, enters kiln by kiln tail tremie pipe, after being mixed with pre- hot-bulb, can make pre-
Hot-bulb temperature reduces suddenly, is added to the problems such as kiln ball percentage of damage, ring formation.
Due to being using reduction kiln flue gas, kiln tail coal to be heated, without additional heater, therefore can be effective
Energy saving, reduces operating cost, and compact conformation, rationally distributed, is conducive to improving kiln and holds usage factor and operating rate.
In a kind of preferred version, described smoke extractor leads to secondary combustion located at described fume collection ceiling portion, its outlet flue
Burn room.Although the kiln exit gas temperature through preheating chamber can decrease, 350 DEG C about still can be maintained, by it again
Send secondary combustion chamber back to be burnt again, then the tail gas after burning enter device for generating power by waste heat, can improve heat utilization rate,
Can avoid directly discharging polluting again.
Brief description
Fig. 1 is the feed postition schematic diagram of kiln tail coal in prior art；
Fig. 2 is a kind of structural representation of specific embodiment of reduction kiln tail coal preheating device provided by the present invention；
Fig. 3 is the top view of Fig. 2.
In Fig. 1:
Drying grate 1 ＇ chute, 2 ＇ rotary kiln 3 ＇
In Fig. 2, Fig. 3:
1. preheating chamber 2. fume collection room 3. smoke extractor 4. drying grate 5. kiln tail coal bunker, 6. material distributing machine 7. dust excluding hood
8. air intake grate plate 9. air-out grate plate 10. baffle plate 11. great wheel 12. reduction kiln, 13. drying grate bonnet 14. secondary combustion chamber
15. preheating section hot-wind inlet 16. unloading valve
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Refer to Fig. 2, Fig. 3, Fig. 2 is a kind of specific embodiment of reduction kiln tail coal preheating device provided by the present invention
Structural representation；Fig. 3 is the top view of Fig. 2.
In a kind of specific embodiment, the reduction kiln tail coal preheating device that the present invention provides is mainly by preheating chamber 1, flue gas
Collecting chamber 2, low temperature backheat smoke extractor 3 etc. are constituted.
Wherein, located at the preheating section exit side of drying grate 4, the kiln tail coal bunker 5 at its top is in infundibulate to preheating chamber 1, and
Top is provided with shuttle type cloth machine 6 and dust excluding hood 7.
Preheating chamber 1 extends to inside burner hearth from above through the roof of the furnace of drying grate 4, the furnace height model of drying grate 4
It is trapped among between 2500mm～2800mm, the width of preheating chamber 1 and height and the furnace width of drying grate 4 and highly consistent, phase
When in the burner hearth cut-off by drying grate 4, only lower end and grate plate keeps a determining deviation, pass through in order to pre- hot-bulb, and by kiln tail coal
It is discharged on pre- hot-bulb, then enter reduction kiln together with pre- hot-bulb.
The internal space for accommodating kiln tail coal of preheating chamber 1, front side is provided with air intake grate plate 8, enters as the pre- heat smoke of preheating chamber
Mouthful, rear side is provided with air-out grate plate 9, and as preheating chamber exhanst gas outlet, the front side of exhaust end is provided with the baffle plate 10 of forward downward extension,
In case leak-stopping wind.
From the point of view of fore-and-aft direction, preheating chamber 1 is located between drying grate 4 preheating section and great wheel 11, along short transverse, preheating chamber
1 is located between the kiln exit gas outlet of reduction kiln 12 and the smoke inlet of secondary combustion chamber 14.
The effect of secondary combustion chamber 14 is the flue gas that burning reduction kiln 12 is discharged completely, is simultaneously introduced excessive air, makes
Gas temperature maintains under pit ash fusing point, and the portion gas that it is discharged lead to drying grate preheating section hot-wind inlet 15, uses
In heating to green-ball.
Fume collection room 2 is located at preheating chamber 1 rear side (for ease of description, herein by the grate plate operation side of drying grate preheating section
To before be defined as, direction in contrast is defined as afterwards), both are separated by air-out grate plate 9, and are connected by exhanst gas outlet,
Its bottom is provided with unloading valve 16, in order to discharge the dust being deposited on bottom.
Smoke extractor 3 is arranged on fume collection room 2 top, for extracting the flue gas in fume collection room 2, and drains into secondary combustion
Burn room 14.After preheating chamber, about 300 DEG C of kiln tail coal temperature, flue-gas temperature is reduced to 350 DEG C about, as see arrows 17 in fig 3,
Flue gas is again sent secondary combustion chamber 14 back to and is carried out second-time burning, and the tail gas after burning is partly into device for generating power by waste heat, one
Point coming back to drying grate preheating section preheats to green-ball, so not only facilitates raising heat utilization rate moreover it is possible to avoid straight
Run in and put flue gas and pollute.
Kiln tail coal marker method is to run using drying grate 4 to drive the bed of material method of operation forward to take away kiln tail coal, passes through
It is located at the resistance to heat shield (not shown) with water-cooling shaft for the exhaust end discharge flow is controlled, band water-cooling heat-resistant baffle plate passes through
Gap between controlling baffle plate and charge level, to control the thickness that coal flows out, thus controlling discharge flow, belongs to existing current techique,
Just not reinflated description.
During work, hot blast is passed through drying grate preheating section from preheating section hot-wind inlet 15, and green-ball is added in drying grate preheating section
Heat, to 850～900 degree, subsequently enters kiln tail coal preheating device, and (300～350 degree) of kiln tail coal after kiln tail coal bunker 5 will preheat is arranged
It is put on pre- hot-bulb, and enter reduction kiln together with pre- hot-bulb.As shown by the arrows in figure 2, the high temperature cigarette discharged from reduction kiln 12
Gas (900～1000 DEG C) part leads directly to secondary combustion chamber 14, and another part shunts under the swabbing action of smoke extractor 3,
Enter inside preheating chamber 1 from the air intake grate plate 8 of preheating chamber 1 front side, the kiln tail coal in preheating chamber 1 is heated, complete heat friendship
After alternatively, the flue gas that temperature reduces enters fume collection room 2 from the air-out grate plate 9 of preheating chamber 1 rear side, then by smoke extractor 3 row
To secondary combustion chamber 14.
By preheating to kiln tail coal, can improve and enter kiln temperature degree into kiln material, so that reduction reaction in kiln for the green-ball is carried
Early occur, it is to avoid pre- hot-bulb successively weares and teares powder phenomenon-tion, reduces green-ball fragmentation, ring formation.
Due to being using reduction kiln flue gas, kiln tail coal to be heated, without additional heater, therefore can be effective
Energy saving, reduces operating cost, and compact conformation, rationally distributed, is conducive to improving kiln and holds usage factor and operating rate.
Certainly, above-mentioned reduction kiln tail coal preheating device is only several preferred versions, is specifically not limited thereto, here basis
On can make according to actual needs having and targetedly adjust, thus obtaining different embodiments.For example preheating chamber 1 is designed
Become other shapes, or the exhaust end of preheating chamber 1 adopts other kinds of control device etc..Due to mode in the cards relatively
Many, just no longer illustrate one by one here.
Above reduction kiln tail coal preheating device provided by the present invention is described in detail.Used herein specifically
Individual example is set forth to the principle of the present invention and embodiment, and the explanation of above example is only intended to help and understands the present invention
Core concept.It should be pointed out that for those skilled in the art, in the premise without departing from the principle of the invention
Under, the present invention can also be carried out with some improvement and modify, these improve and modify the protection also falling into the claims in the present invention
In the range of.
Claims (10)
1. a kind of reduction kiln tail coal preheating device is it is characterised in that include:
Preheating chamber (1), located at drying grate (4) preheating section outlet side；
For accommodating the space of kiln tail coal inside described preheating chamber (1), front side is provided with smoke inlet, and rear side is provided with exhanst gas outlet, bottom
The exhaust end in portion is located above the grate plate of drying grate (4) and is provided with kiln tail coal discharge device；
Fume collection room (2), on rear side of described preheating chamber (1), and is connected with preheating chamber (1) by described exhanst gas outlet；
Smoke extractor (3), outside described fume collection room (2), for extracting the flue gas in fume collection room (2).
2. reduction kiln tail coal preheating device according to claim 1 is it is characterised in that the front side of described preheating chamber (1) sets
There is air intake grate plate (8), form described smoke inlet；The rear side of described preheating chamber (1) is provided with air-out grate plate (9), forms described cigarette
Gas exports.
3. reduction kiln tail coal preheating device according to claim 1 is it is characterised in that described preheating chamber (1) is worn from top
The roof of the furnace crossing described drying grate (4) extends to inside burner hearth.
4. reduction kiln tail coal preheating device according to claim 3 it is characterised in that the width of described preheating chamber (1) and
Height and the furnace width of described drying grate (4) and highly consistent.
5. reduction kiln tail coal preheating device according to claim 4 is it is characterised in that described preheating chamber (1) exhaust end
Front side is provided with the baffle plate (10) of forward downward extension.
6. reduction kiln tail coal preheating device according to claim 1 is it is characterised in that described smoke extractor (3) is located at described
Fume collection room (2) top, its outlet flue leads to secondary combustion chamber (14).
7. reduction kiln tail coal preheating device according to claim 6 is it is characterised in that described fume collection room (2) bottom
It is provided with unloading valve (16).
8. reduction kiln tail coal preheating device according to claim 1 is it is characterised in that described preheating chamber (1) is located at chain comb
Between machine (4) preheating section and great wheel (11).
9. reduction kiln tail coal preheating device according to claim 8 is it is characterised in that described preheating chamber (1) is located at reduction
Kiln (12) lead to secondary combustion chamber (14) kiln exit gas outlet and drying grate (4) front side preheating section hot-wind inlet (15) it
Between.
10. the reduction kiln tail coal preheating device according to any one of claim 1 to 9 is it is characterised in that described discharge device
For the resistance to heat shield of water-cooling shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740482.XA CN104748558B (en) | 2013-12-27 | 2013-12-27 | Tailing preheating device of reduction kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310740482.XA CN104748558B (en) | 2013-12-27 | 2013-12-27 | Tailing preheating device of reduction kiln |
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| CN104748558A CN104748558A (en) | 2015-07-01 |
| CN104748558B true CN104748558B (en) | 2017-01-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201514102U (en) * | 2009-09-22 | 2010-06-23 | 山东奥鹏工贸有限公司 | Calcination system of energy-saving rotary kiln |
| CN101932738A (en) * | 2008-03-27 | 2010-12-29 | 株式会社神户制钢所 | The manufacture method of iron ore pellet |
| CN102252530A (en) * | 2011-07-15 | 2011-11-23 | 中冶北方工程技术有限公司 | Novel waste heat utilization and emission reduction process for hot air systems of chain grate machine, rotary kiln and circular cooler |
| CN202595226U (en) * | 2012-03-28 | 2012-12-12 | 柳州钢铁股份有限公司 | System for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets |
| CN202717792U (en) * | 2012-03-20 | 2013-02-06 | 沈阳博联特熔融还原科技有限公司 | Device for producing direct reduction iron by short process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001081509A (en) * | 1999-09-10 | 2001-03-27 | Mitsubishi Heavy Ind Ltd | Production of reduced iron and apparatus therefor |
-
2013
- 2013-12-27 CN CN201310740482.XA patent/CN104748558B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932738A (en) * | 2008-03-27 | 2010-12-29 | 株式会社神户制钢所 | The manufacture method of iron ore pellet |
| CN201514102U (en) * | 2009-09-22 | 2010-06-23 | 山东奥鹏工贸有限公司 | Calcination system of energy-saving rotary kiln |
| CN102252530A (en) * | 2011-07-15 | 2011-11-23 | 中冶北方工程技术有限公司 | Novel waste heat utilization and emission reduction process for hot air systems of chain grate machine, rotary kiln and circular cooler |
| CN202717792U (en) * | 2012-03-20 | 2013-02-06 | 沈阳博联特熔融还原科技有限公司 | Device for producing direct reduction iron by short process |
| CN202595226U (en) * | 2012-03-28 | 2012-12-12 | 柳州钢铁股份有限公司 | System for optimizing thermal regulations of chain grate-rotary kiln oxidized pellets |
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