CN106403594A - Combination oxidation-reducing roasting rotary hearth furnace - Google Patents
Combination oxidation-reducing roasting rotary hearth furnace Download PDFInfo
- Publication number
- CN106403594A CN106403594A CN201611041115.0A CN201611041115A CN106403594A CN 106403594 A CN106403594 A CN 106403594A CN 201611041115 A CN201611041115 A CN 201611041115A CN 106403594 A CN106403594 A CN 106403594A
- Authority
- CN
- China
- Prior art keywords
- furnace
- rotary hearth
- barricade
- hearth furnace
- roasting area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
- F27B13/02—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge of multiple-chamber type with permanent partitions; Combinations of furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
- F27B13/06—Details, accessories, or equipment peculiar to furnaces of this type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/16—Treatment involving a chemical reaction
- F27M2003/165—Reduction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/16—Treatment involving a chemical reaction
- F27M2003/167—Oxydation
Abstract
The invention discloses a combination oxidation-reducing roasting rotary hearth furnace. The combination oxidation-reducing roasting rotary hearth furnace comprises a furnace body, a furnace bottom, a retaining wall, flues and a combustor; the furnace bottom is annular and is located below the furnace body, and an annular space is formed by the furnace bottom and the furnace body; the retaining wall is arranged in the furnace body and is connected with the outer side wall, the furnace top and the inner side wall, the annular space is divided into an oxidation roasting area and a reducing roasting area through the retaining wall, the retaining wall comprises a hollow retaining wall and a solid retaining wall, a reducing agent inlet is formed in the hollow retaining wall, and the interior of the hollow retaining wall is vertically through; the flues are arranged on the furnace top of the oxidation roasting area, and are evenly arranged in the round direction. According to the rotary hearth furnace, oxidation roasting and reducing roasting of materials are completed in an integrated manner, the reducing effect is good, and the running cost is low.
Description
Technical field
The invention belongs to technical field of metallurgical equipment, more particularly, to a kind of rotary hearth furnace of co-oxidation-reduction roasting.
Background technology
Rotary hearth furnace direct-reduction technique is nearly three ironmaking growing up during the decade and processes special nonferrous metallic ores
New technology.Rotary hearth furnace direct-reduction eliminates blast furnace coking flow process, is the technology of energy-conserving and environment-protective.Because this technique is to former
Material is less demanding with fuel, rationally can utilize natural resourcess, thus be paid high attention to by metallurgical and coloured industry.
Rotary hearth furnace oil ring shape siege, outboard sidewalls, furnace roof, combustion system etc. form.Side wall, furnace roof maintain static, siege
Circulation rotating is driven by furnace bottom transmission mechanism.The technological process of rotary hearth furnace is to add fine ore and reducing agent to make after binding agent
Ball, and pelletizing is evenly spaced in the furnace bottom of rotary hearth furnace, during the pelletizing on furnace bottom rotates a circle with furnace bottom, complete also
Former.The metallized pellet being produced by rotary hearth furnace can be as the raw material of blast furnace or molten point of stove etc., to obtain metal.
The process characteristic of rotary hearth furnace：
(1) in rotary hearth furnace, the material of reduction roasting is carbonaceous pelletizing, and the contact between carbon and ferrum oxide closely, has good
Good fast restore condition.
(2) rotary hearth furnace reduction roasting technique is that the thin bed of material heats in high temperature, achievable fast restore, and furnace charge is gone back in stove
The former time is short.
(3) because the thin bed of material, furnace charge be not pressurized in rotary hearth furnace, and no relative motion between furnace charge and furnace lining, therefore right
The intensity requirement of furnace charge is not high, will not produce dough and body of heater resistance to material bonding phenomenon.
Current rotary hearth furnace is although the treating capacity of separate unit is larger, but single function, only reduction effect, some are needed
Want the raw material direct-reduction effect of oxidizing roasting poor, limit the use of rotary hearth furnace；The furnace atmosphere of rotary hearth furnace is uncontrollable, material
The problems such as heat uneven needs to improve.
Content of the invention
In order to solve the above problems, the present invention proposes a kind of rotary hearth furnace of co-oxidation-reduction roasting, and barricade is by rotary hearth furnace
It is divided into oxidizing roasting area and reduction roasting area, control climate can be oxidizing atmosphere by oxidizing roasting area, hollow barricade will be through
One layer of reducing agent of material bedding after oxidizing roasting, reduction roasting area is reducing atmosphere, and reduction effect is good, and energy consumption is low, runs into
This is little.
The present invention provides a kind of rotary hearth furnace of co-oxidation-reduction roasting, including body of heater, furnace bottom, barricade, flue and burning
Device；
Described body of heater includes lateral wall, furnace roof and medial wall, and described lateral wall connects described medial wall by furnace roof, described
The cross-sectional area of body of heater is annular；
Described furnace bottom is ring-type, and below described body of heater, described furnace bottom constitutes annular space with described body of heater；
In described body of heater, described barricade connects described lateral wall, furnace roof and medial wall, described barricade to described dams setting
Described annular space is divided into oxidizing roasting area and reduction roasting area, described barricade includes hollow barricade and solid barricade, institute
State hollow barricade and be provided with reducing agent entrance, described hollow barricade inside up/down perforation；
Described flue is arranged on described oxidizing roasting area furnace roof, and multiple described flues are evenly arranged along circular direction；
Described burner is installed on described body of heater.
The furnace bottom of rotary hearth furnace is rotatable, drives material to move in body of heater.Barricade is vertically arranged in body of heater, by rotary hearth furnace
Interior annular space is divided into different regions, and different regions can arrange different atmosphere, and the atmosphere of zones of different will not
Interfere with each other the multi-functional utilization it is achieved that rotary hearth furnace.Multiple flues are set in the furnace roof of oxidizing roasting area rotary hearth furnace, for inciting somebody to action
A large amount of flue gases that oxidizing roasting area produces are discharged.
Reducing agent entrance is arranged on the top of hollow barricade, hollow barricade inner hollow, enters rotary hearth furnace as reducing agent
Passage, can prevent reducing agent falling process occur burning and uneven cloth.
Further, setting feeding mouth and discharging opening on described body of heater, described feeding mouth is arranged on described oxidizing roasting area
On lateral wall, described discharging opening is arranged on described reduction roasting area lateral wall.
Specifically, described feeding mouth is arranged on the solid barricade end in described oxidizing roasting area.Described discharging opening is arranged on described
Reduction roasting area solid barricade end.Between described feeding mouth and discharging opening, the radian of sector region is 10 °～20 °.Feeding mouth and
The setting of discharging opening can extend the time in rotary hearth furnace for the pelletizing as far as possible, improves reduction effect.
As the preferred version of the present invention, described oxidizing roasting area radian is 90 °～120 °.The burner in oxidizing roasting area
For heat-storage type burner, oxidizing roasting area is controlled to oxidizing atmosphere, removes partial impurities, can improve while material is oxidized
The reproducibility of material.
As the preferred version of the present invention, described reduction roasting area radian is 220 °～260 °.The burning in reduction roasting area
Device is heat-storage type burner, and reduction roasting area is reducing atmosphere, and it is anti-that pelletizing contacts generation reduction in reduction roasting area with reducing agent
Should, obtain metallized pellet.
Further, reducing zone and cooling zone are divided in described reduction roasting, and described cooling zone radian is 50 °～90 °, institute
State cooling zone one end to be connected with discharging opening, described cooling zone furnace roof and two side are provided with water-cooling wall.Reduction roasting is divided into
Reducing zone and cooling zone are conducive to the subsequent treatment of pelletizing.Water-cooling wall is arranged on cooling zone furnace roof and two side, controls water-cooling wall
Current make cooling zone temperature control to discharging requirement temperature.
As preferred embodiment, described barricade bottom and described furnace bottom vertical dimension are 10～20cm.Barricade bottom
Distance to the furnace bottom upper surface of rotary hearth furnace should ensure passing through of material, ensures oxidizing roasting area atmosphere and reduction again
Roast area atmosphere does not interfere with each other.
Further, the lower section of described oxidizing roasting area furnace bottom is uniformly arranged several passages along circular direction, and aperture is 3
～6mm.Passage can be passed through oxygen or large quantity of air, keeps the oxidizing atmosphere in oxidizing roasting area.
The rotary hearth furnace of the co-oxidation-reduction roasting of the present invention, can realize two kinds of atmosphere in body of heater by barricade mutual not
Interference；Material is integrally completed with reduction roasting in rotary hearth furnace internal oxidition roasting；After the oxidized roasting of material, reduction effect is good；Also
Former roast area makes full use of the sensible heat of oxidizing roasting area material, and energy consumption is little, low cost.
Brief description
Fig. 1 is the schematic top plan view of the rotary hearth furnace of the present invention；
Fig. 2 is the partial view of the hollow barricade of the present invention.
In figure：
1- body of heater；101- reducing agent entrance；102- feeding mouth；103- discharging opening；104- passage；
2- furnace bottom；3- barricade；4- flue；5- burner；6- oxidizing roasting area；7- reduction roasting area；701- reducing zone；
702- cooling zone.
Specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in more details, so that energy
The advantage enough more fully understanding the solution of the present invention and its various aspects.However, specific embodiments described below and enforcement
Example is only descriptive purpose, rather than limitation of the present invention.
As depicted in figs. 1 and 2, the embodiment of the present invention provides a kind of rotary hearth furnace of co-oxidation-reduction roasting, including body of heater
1st, furnace bottom 2, barricade 3, flue 4 and burner 5.
Body of heater 1 includes lateral wall, furnace roof and medial wall, and lateral wall connects medial wall, the cross-sectional area of body of heater by furnace roof
For annular.
Furnace bottom 2 is ring-type, and below body of heater 1, furnace bottom 2 constitutes annular space with body of heater 1.Furnace bottom 2 can be around rotary hearth furnace
Central shaft rotates, and the material entering rotary hearth furnace falls on furnace bottom 2, and the material that rotarily drives of furnace bottom 2 rotates in rotary hearth furnace.
Barricade 3 is arranged in body of heater 1, and barricade connects lateral wall, furnace roof and medial wall, and barricade 3 is by the annular in rotary hearth furnace
Space is divided into oxidizing roasting area 6 and reduction roasting area 7.The vertical dimension of barricade 3 bottom and furnace bottom 2 upper surface is 10～
20cm.The distance of barricade bottom to the furnace bottom upper surface of rotary hearth furnace should ensure passing through of material, ensures oxidation roasting again
Burn area's atmosphere and reduction roasting area atmosphere does not interfere with each other.
Barricade 3 includes hollow barricade 301 and solid barricade 302.Hollow barricade 301 is provided with reducing agent entrance 101, hollow
The internal up/down perforation of barricade 301.
Reducing agent entrance 101 is arranged on the top of hollow barricade 301, hollow barricade 301 inner hollow, enters as reducing agent
Enter the passage of rotary hearth furnace, can prevent reducing agent from the process that falls, burning and uneven cloth occurring.
Flue 4 is arranged on oxidizing roasting area 6 furnace roof, and multiple flues 4 are evenly arranged along circular direction.Turn in oxidizing roasting area
The furnace roof of 6 bottom stoves arranges multiple flues 4, and a large amount of flue gases for producing oxidizing roasting area are discharged.
Burner 5 is installed on the two side of body of heater 1.Burner 5 is regenerative gas burner, with respect to electrical heating,
Gas heating energy consumption is less.Regenerative gas burner noise is little, life-span length, flame stabilization, spreadability are good, burning is complete, gas
Atmosphere is easily controllable.
Further, setting feeding mouth 102 and discharging opening 103 on body of heater 1, feeding mouth 102 is arranged on outside oxidizing roasting area 6
On the wall of side, discharging opening 103 is arranged on reduction roasting area 7 lateral wall.
Specifically, feeding mouth 102 is arranged on the solid barricade end in oxidizing roasting area 6.Discharging opening 103 is arranged on reduction roasting area
7 solid barricade ends.Between feeding mouth 102 and discharging opening 103, the radian of sector region is 10 °～20 °.In other words, solid gear
Wall 302 is arranged in sector region between feeding mouth 102 and discharging opening 103.The setting of feeding mouth 102 and discharging opening 103 can be use up
Amount extends the time in rotary hearth furnace for the pelletizing, improves reduction effect.
In the embodiment of the present invention, oxidizing roasting area 6 radian is 90 °～120 °.The burner in oxidizing roasting area is heat accumulating type
Burner, oxidizing roasting area is controlled to oxidizing atmosphere, removes partial impurities while material is oxidized, can improve going back of material
Originality.
In the embodiment of the present invention, reduction roasting area 7 radian is 220 °～260 °.The burner in reduction roasting area is heat accumulating type
Burner, reduction roasting area is reducing atmosphere, and pelletizing contacts generation reduction reaction in reduction roasting area with reducing agent, obtains metal
Pellet.
Further, reduction roasting area 7 is divided into reducing zone 701 and cooling zone 702.Cooling zone 702 radian is 50 °～90 °,
Cooling zone 702 one end is connected with discharging opening 103, and cooling zone 702 furnace roof and two side are provided with water-cooling wall.By reduction roasting area 7
It is divided into reducing zone 701 and cooling zone 702 to be conducive to the subsequent treatment of pelletizing.Water-cooling wall is arranged on cooling zone furnace roof and two side,
Water-cooling wall current are controlled to make cooling zone temperature control to discharging requirement temperature.
In the embodiment of the present invention, the lower section of oxidizing roasting area furnace bottom is uniformly arranged several passages 104, hole along circular direction
Footpath is 3～6mm.Passage 104 can be passed through oxygen or large quantity of air, keeps the oxidizing atmosphere in oxidizing roasting area.
Arrow in Fig. 1 and Fig. 2 represents the direction of motion of material, and dash area represents reducing agent.
The furnace bottom of rotary hearth furnace is rotatable, and pelletizing is entered by rotary hearth furnace feeding mouth, and the furnace bottom with rotary hearth furnace rotates, and successively passes through
Oxidizing roasting area and reduction roasting area, material (pelletizing) oxidizing roasting in oxidizing roasting area, reducing agent enters through hollow barricade
Rotary hearth furnace, the material after oxidation enters reduction roasting area and is uniformly laid a floor reducing agent, roasts in the reduction with reducing atmosphere
Burn area and be reduced into metallized pellet, finally discharge from discharging opening.
Rotary hearth furnace provided in an embodiment of the present invention, by arranging barricade in rotary hearth furnace, realizes two kinds of atmosphere in body of heater mutual
Do not disturb；Hollow barricade is entered the passage of rotary hearth furnace it is therefore prevented that the burning of reducing agent and cloth are uneven as reducing agent；Material
Initial oxidation roasting in rotary hearth furnace, rear reduction roasting, reduction effect is good；Reduction roasting area makes full use of oxidizing roasting area material
Sensible heat, energy consumption is little, low cost.
It should be noted that each embodiment above by reference to described by accompanying drawing only limits this in order to illustrate rather than
The scope of invention, it will be understood by those within the art that, right under the premise without departing from the spirit and scope of the present invention
Modification or equivalent that the present invention is carried out, all should cover within the scope of the present invention.Additionally, indication unless the context
Outward, the word occurring in the singular includes plural form, and vice versa.In addition, unless stated otherwise, then any embodiment
All or part of can use in conjunction with all or part of of any other embodiment.
Claims (10)
1. a kind of rotary hearth furnace of co-oxidation-reduction roasting is it is characterised in that include body of heater, furnace bottom, barricade, flue and burning
Device, wherein,
Described body of heater includes lateral wall, furnace roof and medial wall, and described lateral wall connects described medial wall, described body of heater by furnace roof
Cross-sectional area be annular；
Described furnace bottom is ring-type, and below described body of heater, described furnace bottom constitutes annular space with described body of heater；
In described body of heater, described barricade connects described lateral wall, furnace roof and medial wall to described dams setting, and described barricade is by institute
State annular space and be divided into oxidizing roasting area and reduction roasting area, described barricade includes hollow barricade and solid barricade, described sky
Heart barricade is provided with reducing agent entrance, described hollow barricade inside up/down perforation；
Described flue is arranged on described oxidizing roasting area furnace roof, and multiple described flues are evenly arranged along circular direction；
Described burner is installed on described body of heater.
2. according to claim 1 rotary hearth furnace it is characterised in that setting feeding mouth and discharging opening on described body of heater, described enter
Material mouth is arranged on described oxidizing roasting area lateral wall, and described discharging opening is arranged on described reduction roasting area lateral wall.
3. according to claim 2 rotary hearth furnace it is characterised in that described feeding mouth is arranged on the solid gear in described oxidizing roasting area
Wall end.
4. according to claim 2 rotary hearth furnace it is characterised in that described discharging opening is arranged on the solid gear in described reduction roasting area
Wall end.
5. according to claim 1 rotary hearth furnace it is characterised in that described oxidizing roasting area radian be 90 °～120 °.
6. according to claim 1 rotary hearth furnace it is characterised in that described reduction roasting area radian be 220 °～260 °.
7. according to claim 6 rotary hearth furnace it is characterised in that reducing zone and cooling zone, institute are divided in described reduction roasting
State cooling zone radian and be 50 °～90 °, described cooling zone one end is connected with discharging opening, described cooling zone furnace roof and two side are installed
There is water-cooling wall.
8. according to claim 1 rotary hearth furnace it is characterised in that described barricade bottom and described furnace bottom vertical dimension be 10～
20cm.
9. according to claim 1 rotary hearth furnace it is characterised in that the lower section of described oxidizing roasting area furnace bottom is equal along circular direction
The several passages of even setting, aperture is 3～6mm.
10. according to claim 2 rotary hearth furnace it is characterised in that between described feeding mouth and discharging opening sector region arc
Spend for 10 °～20 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611041115.0A CN106403594A (en) | 2016-11-22 | 2016-11-22 | Combination oxidation-reducing roasting rotary hearth furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611041115.0A CN106403594A (en) | 2016-11-22 | 2016-11-22 | Combination oxidation-reducing roasting rotary hearth furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106403594A true CN106403594A (en) | 2017-02-15 |
Family
ID=58082308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611041115.0A Pending CN106403594A (en) | 2016-11-22 | 2016-11-22 | Combination oxidation-reducing roasting rotary hearth furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881283A (en) * | 2017-11-21 | 2018-04-06 | 江苏省冶金设计院有限公司 | A kind of rotary hearth furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11248358A (en) * | 1998-03-02 | 1999-09-14 | Daido Steel Co Ltd | Metal reducing apparatus |
| JP2007147195A (en) * | 2005-11-29 | 2007-06-14 | Kobe Steel Ltd | Material input method into rotary hearth furnace, and reduction treatment method of iron oxide by rotary hearth furnace using it |
| CN103074460A (en) * | 2013-01-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | Rotary hearth furnace equipment for segment handling of iron ore and handling method |
| CN104801170A (en) * | 2015-04-09 | 2015-07-29 | 常熟市华能环保工程有限公司 | Annular reducer spraying device of pellet flue gas denitrification system |
| CN206469686U (en) * | 2016-11-22 | 2017-09-05 | 江苏省冶金设计院有限公司 | A kind of rotary hearth furnace of co-oxidation reduction roasting |
-
2016
- 2016-11-22 CN CN201611041115.0A patent/CN106403594A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11248358A (en) * | 1998-03-02 | 1999-09-14 | Daido Steel Co Ltd | Metal reducing apparatus |
| JP2007147195A (en) * | 2005-11-29 | 2007-06-14 | Kobe Steel Ltd | Material input method into rotary hearth furnace, and reduction treatment method of iron oxide by rotary hearth furnace using it |
| CN103074460A (en) * | 2013-01-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | Rotary hearth furnace equipment for segment handling of iron ore and handling method |
| CN104801170A (en) * | 2015-04-09 | 2015-07-29 | 常熟市华能环保工程有限公司 | Annular reducer spraying device of pellet flue gas denitrification system |
| CN206469686U (en) * | 2016-11-22 | 2017-09-05 | 江苏省冶金设计院有限公司 | A kind of rotary hearth furnace of co-oxidation reduction roasting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881283A (en) * | 2017-11-21 | 2018-04-06 | 江苏省冶金设计院有限公司 | A kind of rotary hearth furnace |
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