CN108020084A - A kind of rotary hearth furnace smoke waste heat utilization system and method - Google Patents
A kind of rotary hearth furnace smoke waste heat utilization system and method Download PDFInfo
- Publication number
- CN108020084A CN108020084A CN201711470390.9A CN201711470390A CN108020084A CN 108020084 A CN108020084 A CN 108020084A CN 201711470390 A CN201711470390 A CN 201711470390A CN 108020084 A CN108020084 A CN 108020084A
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- rotary hearth
- hearth furnace
- flue gas
- furnace
- feeding mechanism
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Classifications
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- 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
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0063—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising endless belts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a kind of rotary hearth furnace flue gas utilization system, including：Rotary hearth furnace system, dryer, belt transportation system, buffer bin, seal silo, flue system.Also disclose a kind of rotary hearth furnace fume afterheat Application way, flue gas enters from the lower end of feeding mechanism, waste heat is passed into cold conditions material through cold conditions material, when reaching certain temperature, CO gases in flue gas reduce the ferriferous oxide in material or other metal oxides, when flue gas is through material to feeding mechanism upper end, enter under the action of air-introduced machine in dryer, conduct heat with water-containing materials, by the moisture evaporation in water-containing materials, flue gas is discharged together with the water vapour of generation from exhanst gas outlet, under the action of flue system air-introduced machine, flue gas first carries out dedusting through deduster, then discharged through chimney, pass through the optimization design to structure and system, take full advantage of the waste heat and CO therein also Primordial Qi of flue gas, utilization ratio is high, equipment investment is few, advantageously reduce system energy consumption.
Description
Technical field
The present invention relates to metallurgical field of smelting, specifically, be related to a kind of system that rotary hearth furnace fume afterheat utilizes and
Method.
Background technology
In recent years, non-blast furnace ironmaking technology is rapidly developed, rotary hearth furnace process as a kind of coal-based DR process,
The valuable metal resource such as iron content inferior can not only be handled, and using coal as reducing agent, the characteristics of compound China's energy resource structure,
It is provided simultaneously with that equipment is simple, operation is easy, with short production cycle, reaction speed is fast, advantages of environment protection, and then causes in the industry
Extensive concern.At present, rotary hearth furnace direct-reduction mainly using fuel gas buring to meet calorific requirement, while turn bottom in order to prevent
The metallized pellet re-oxidation being reduced in stove stove, is generally controlled in stove as reduction by controlling the ratio of air and combustion gas
Property atmosphere, that is, burn burn incompletely, makes the CO gases that certain content is preserved in flue gas.This partial fume has very high temperature
Degree, generally more than 1000 DEG C, by being arranged outside flue and chimney, causes substantial amounts of waste heat and CO resource to there is no abundant profit
With；Or the flue gas of high temperature after heat exchange, waste heat boiler etc. first utilize waste heat again through smoke stack emission, this kind of processing side
In addition method can cause heat exchanger to block, it is necessary to carry out the investment of the equipment such as heat exchanger, boiler in flue gas there are substantial amounts of dust
Or erosion failure, it is impossible to efficiently use fume afterheat, more do not utilized to the CO in flue gas.
The content of the invention
For the waste heat and wherein CO that flue gas in the technique of existing rotary hearth furnace production direct reduced iron, can not be efficiently used also
The technical barrier of raw-gas, the present invention are improved existing rotary hearth furnace flue structure, while provide a kind of rotary hearth furnace flue gas profit
System, by the optimization design of system, effectively solves that CO utilization rates are low, and the difficulty that can not efficiently use of waste heat of flue gas
Topic, propose one kind on the basis of existing rotary hearth furnace process is not increased, low cost, cascade utilization rotary hearth furnace fume afterheat and efficiently
Utilize the system and method for CO gases.
For this invention discloses a kind of rotary hearth furnace flue gas utilization system, including：
The rotary hearth furnace system includes rotary hearth furnace and rotary hearth furnace material-feeding mechanism, and the rotary hearth furnace material-feeding mechanism includes charger
Structure and smoke exhaust mechanism, the rotary hearth furnace include inlet port and outlet port；Wherein,
The feeding mechanism connects the feed inlet, the smoke exhaust mechanism be arranged on the tube wall of the feeding mechanism and and
The feeding mechanism connects the rotary hearth furnace through same passage；
The dryer includes gas inlet and exhanst gas outlet, and the gas inlet is connected with the smoke exhaust mechanism.
Further, the rotary hearth furnace flue gas utilization system further includes：Belt transportation system, buffer bin, sealing material
Storehouse, flue system；
The buffer bin includes feed bin feed inlet and feed bin discharge hole；
Described belt transportation system one end connects the dryer discharge port of the dryer, the other end connect the feed bin into
Material mouth；
The bin outlet is connected above the seal silo, lower section connects the feeding mechanism；
The flue system includes deduster, air-introduced machine and chimney, and described deduster one end connects the exhanst gas outlet, separately
One end is sequentially connected the air-introduced machine and the chimney.
Further, the feeding mechanism includes top expects pipe and lower part expects pipe, the top expects pipe and the lower part
Expects pipe is tightly connected；The top of the top expects pipe has feed openings, and the bottom of the lower part expects pipe has discharge openings, institute
State the feed inlet that discharge openings connect the rotary hearth furnace；
The smoke exhaust mechanism has bleeding point and gas outlet, and the bleeding point is communicated to the top expects pipe；The outlet
Mouth is communicated to the gas inlet of the dryer, and the smoke exhaust mechanism is used to flue gas being evacuated in the feeding mechanism by rotary hearth furnace
And it is expelled to from the gas outlet in the dryer.
Further, the seal silo includes the first seal silo and the second sealing for the speed for being used to control charging
Feed bin；First seal silo is arranged on above second seal silo, close with feed inlet at the top of the first seal silo
Valve is sealed, and first seal silo is connected with second seal silo by the first sealed valve；Described second is close
Envelope feed bin is connected with the feeding mechanism by the second sealed valve.
Further, the rotary hearth furnace further include annular furnace body, ring-shaped furnace bottom, furnace bottom transmission mechanism, for turn bottom
The heat power engineering system of stove heat, the rotary hearth furnace material-feeding mechanism further include barricade and material scraping plate；
The annular furnace body is circumferentially disposed with loading area, high temperature reduction area, cooling zone and discharge zone, the charging
Mouth is arranged on the loading area, and the discharge port is arranged on the discharge zone；
The ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace body, and ring-shaped furnace bottom is supported by the furnace bottom transmission mechanism
And drive from the direction in the loading area to the high temperature reduction area and rotate with the furnace bottom transmission mechanism；The feed inlet is set
Distance above the ring-shaped furnace bottom and between the ring-shaped furnace bottom is more than fabric thickness；
The barricade includes the first barricade and the second barricade, be arranged on the furnace roof of the annular furnace body and with the stove
The cloth at bottom does not contact；
The material scraping plate is radially arranged between the discharge openings of feeding mechanism and the high temperature reduction area, and is fixed on institute
On the furnace roof for stating annular furnace body, it is thick equal to the cloth that the material scraping plate is adjustable to the distance between described ring-shaped furnace bottom
Degree.
Further, the loading area and the material scraping plate of high temperature reduction area radial direction separate, the charging
Separated between area and the discharge zone with the first barricade of radial direction, with radial direction between the high temperature reduction area and the cooling zone
Second barricade separates.
Further, top expects pipe can be cylindric expects pipe, and lower part expects pipe can be square expects pipe.
Further, material scraping plate is made of heat-resistance stainless steel plate, and the thickness of the heat-resistance stainless steel plate is 20mm.
Further, smoke exhaust mechanism is arranged at 2nd/1st to three/3rd of top expects pipe.
Further, smoke exhaust mechanism includes at least three air-introduced machines.
Further, at least three air-introduced machines are circumferentially provided at 2nd/1st to three/3rd of top expects pipe, are drawn
The quantity of wind turbine makes choice according to actual power, can be three air-introduced machines, i.e., circumferential at interval of 120 ° of settings one, or
Four air-introduced machines, i.e., it is circumferential to set one at interval of 90 °.
Further, the top of material scraping plate is provided with coolant inlet and coolant outlet, and the inside of material scraping plate is set
There is the coolant circulation passage that both ends are connected with coolant inlet and coolant outlet.
Further, the cooling agent for being passed through material scraping plate can be water.
Further, the shell of top expects pipe and lower part expects pipe is made of heat-resistance stainless steel plate, heat-resistance stainless steel plate
Inner surface is corundum castable.
Further, the thickness of the heat-resistance stainless steel plate of the shell of top expects pipe and lower part expects pipe is 5mm, and corundum is poured into a mould
The thickness of material is 50mm~100mm.
Further, feed inlet is arranged on above ring-shaped furnace bottom at 15cm~25cm.
Further, heat power engineering system includes multiple burners, which is arranged on the corresponding furnace wall side wall in high temperature reduction area
On, for being heated to material in stove.
Further, discharging mechanism is set on discharge zone, and discharging mechanism is connected with discharge port, goes out for rotary hearth furnace
Material.
The embodiment of the invention also discloses a kind of method that rotary hearth furnace fume afterheat using said system utilizes, including with
Lower step：
S1, the feeding mechanism of rotary hearth furnace and seal silo fill material, simultaneously close off the valve of seal silo, Jin Ermi
Seal the top of the feeding mechanism；
S2, material are rotated in ring-shaped furnace bottom, are discharged behind high temperature reduction area, cooling zone, fuel gas buring and the material
Reduce the flue gas produced in the direction of motion and furnace bottom in the rotary hearth furnace material movement direction on the contrary, smoke exhaust mechanism work
Under, enter from the lower end of feeding mechanism, through cold conditions material, waste heat is passed into cold conditions material, the cold conditions material is pre-
Heat is when arriving certain temperature, the CO gases in the flue gas by the ferriferous oxide in the cold conditions material or other metal oxides also
It is former；
When S3, the flue gas are through the material to the feeding mechanism upper end, discharged through the smoke exhaust mechanism, into drying
In machine；
The water-containing materials that S4, the flue gas enter in dryer with the dryer feeding mouth conduct heat, described to contain
Moisture evaporation is water vapour in water material, and the flue gas is discharged with the water vapour from the exhanst gas outlet；
S5, the flue gas of exhanst gas outlet discharge and the water vapour are arranged through deduster, air-introduced machine and chimney successively
Go out.
Further, about 1000 DEG C~1300 DEG C of the temperature of the flue gas in the rotary hearth furnace.
Further, the cold conditions material is preheated to 800 DEG C~1200 DEG C by the fume afterheat.
Further, the flue-gas temperature of the smoke exhaust mechanism discharge is down to 300 DEG C~450 DEG C.
Further, the temperature of the flue gas of the exhanst gas outlet discharge in the dryer is down to 120 DEG C~200 DEG C.
The beneficial effects of the present invention are：
The present invention takes full advantage of waste heat and the CO therein reduction of flue gas by the optimization design to structure and system
Gas, utilization ratio is high, and equipment investment is few, advantageously reduces system energy consumption.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the structure diagram for the system that transfer bottom of the present invention kiln gas utilizes.
Fig. 2 is the structure diagram of rotary hearth furnace in the present invention.
Reference numeral：
1st, rotary hearth furnace system, 2, dryer, 3, belt transportation system, 4, buffer bin, 5, seal silo, 6, flue system
System, 100, rotary hearth furnace, 200, feeding mechanism, 300, smoke exhaust mechanism, 101, feed inlet, 102, discharge port, 103, loading area, 104,
High temperature reduction area, 105, cooling zone, 106, ring-shaped furnace bottom, 107, material scraping plate, the 108, first barricade, the 109, second barricade, 601,
Deduster, 602, air-introduced machine, 603, chimney.
Embodiment
The embodiment of the present invention is described below in detail, the example of embodiment is shown in the drawings, wherein identical from beginning to end
Or similar label represents same or similar element or has the function of same or like element.Retouched below with reference to attached drawing
The embodiment stated is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
Attached drawing 1 according to the present invention, shows a kind of system of rotary hearth furnace flue gas utilization, specifically includes：
Rotary hearth furnace system 1 and dryer 2,
The rotary hearth furnace system 1 includes rotary hearth furnace 100 and rotary hearth furnace material-feeding mechanism, the rotary hearth furnace material-feeding mechanism include into
Material mechanism 200 and smoke exhaust mechanism 300, the rotary hearth furnace 100 include feed inlet 101 and discharge port 102；Wherein,
The feeding mechanism 200 connects the feed inlet 101, and the smoke exhaust mechanism 300 is arranged on the feeding mechanism 200
Tube wall on and with the feeding mechanism 200 connect the rotary hearth furnace 100 through same passage；
The dryer 2 includes gas inlet and exhanst gas outlet, and the gas inlet is connected with the smoke exhaust mechanism 300.
More specifically, the rotary hearth furnace flue gas utilization system further includes：Belt transportation system 3, buffer bin 4, sealing material
Storehouse 5, flue system 6；
The buffer bin 4 includes feed bin feed inlet and feed bin discharge hole；
The dryer discharge port of 3 one end of belt transportation system connection dryer, the other end connect the feed bin charging
Mouthful；
The top of seal silo 5 connects the bin outlet, and lower section connects the feeding mechanism 200；
The flue system 6 includes deduster 601, air-introduced machine 602 and chimney 603, and described 601 one end of deduster connects institute
Exhanst gas outlet is stated, the other end is sequentially connected the air-introduced machine 602 and the chimney 603.
More specifically, the feeding mechanism 200 includes top expects pipe and lower part expects pipe, the top expects pipe and the lower part
Expects pipe is tightly connected；The top of the top expects pipe has feed openings, and the bottom of the lower part expects pipe has discharge openings, institute
State the feed inlet 101 that discharge openings connect the rotary hearth furnace；
The smoke exhaust mechanism 300 has bleeding point and gas outlet, and the bleeding point is communicated to the top expects pipe；It is described go out
Gas port is communicated to the gas inlet of the dryer 2, and the smoke exhaust mechanism 300 is used to flue gas being evacuated to the feeding mechanism 200
It is interior and be expelled to from the gas outlet in the dryer 2.
More specifically, the seal silo 5 includes the first seal silo and the second sealing for the speed for being used to control charging
Feed bin；First seal silo is arranged on above second seal silo, close with feed inlet at the top of the first seal silo
Valve is sealed, and first seal silo is connected with second seal silo by the first sealed valve；Described second is close
Envelope feed bin is connected with the feeding mechanism 200 by the second sealed valve.
More specifically, with reference to attached drawing 2, the rotary hearth furnace 100 further includes annular furnace body, ring-shaped furnace bottom 106, furnace bottom and passes
Motivation structure, the heat power engineering system for being heated for rotary hearth furnace, the rotary hearth furnace material-feeding mechanism further include barricade and material scraping plate 107；
It is described annular furnace body be circumferentially disposed with counterclockwise loading area 103, high temperature reduction area 104, cooling zone 105 and
Discharge zone, the feed inlet 101 are arranged on the loading area 103, and the discharge port 102 is arranged on the discharge zone；
The ring-shaped furnace bottom 106 is correspondingly arranged at the lower section of the annular furnace body, and ring-shaped furnace bottom 106 is by the furnace bottom driver
Structure, which is supported and driven with the furnace bottom transmission mechanism from the direction in the loading area 103 to the high temperature reduction area 104, to be rotated；Institute
Feed inlet 101 is stated to be arranged on above the ring-shaped furnace bottom and be more than fabric thickness with the distance between the ring-shaped furnace bottom 106；
The barricade includes the first barricade 108 and the second barricade 109, be arranged on the furnace roof of the annular furnace body and with
The cloth of the furnace bottom does not contact；
The material scraping plate 107 is radially arranged between the discharge openings of feeding mechanism 200 and the high temperature reduction area 104,
And be fixed on the furnace roof of the annular furnace body, the material scraping plate is adjustable to the distance between described ring-shaped furnace bottom and is equal to institute
State fabric thickness and be fixed on the furnace roof of the annular furnace body, the material scraping plate 107 is adjustable to and the ring-shaped furnace bottom 106
The distance between be equal to the fabric thickness.
When the material bed needs in rotary hearth furnace are thicker, material scraping plate 107 (can be expected towards the top of feeding mechanism upwards
Pipe direction or the direction opposite with feedstock direction) it is mobile；, can be by material scraping plate when the material bed needs in rotary hearth furnace are relatively thin
107 is mobile (i.e. towards the lower part expects pipe direction of feeding mechanism or the direction consistent with feedstock direction) downwards.
More specifically, the loading area 103 separates with the high temperature reduction area 104 material scraping plate 107 of radial direction, institute
State and separate 108 with the first barricade of radial direction between loading area 103 and the discharge zone, the high temperature reduction area 104 with it is described cold
But separated between area 105 with the second barricade 109 of radial direction.
More specifically, top expects pipe can be cylindric expects pipe, lower part expects pipe can be square expects pipe.
More specifically, material scraping plate 107 is made of heat-resistance stainless steel plate, the thickness of the heat-resistance stainless steel plate is 20mm.
More specifically, smoke exhaust mechanism 300 is arranged at 2nd/1st to three/3rd of top expects pipe.
More specifically, smoke exhaust mechanism 300 includes at least three air-introduced machines.
More specifically, at least three air-introduced machines are circumferentially provided at 2nd/1st to three/3rd of top expects pipe, air inducing
The quantity of machine makes choice according to actual power, can be three air-introduced machines, i.e., circumferential to set one at interval of 120 °, Huo Zhesi
A air-introduced machine, i.e., it is circumferential to set one at interval of 90 °.
More specifically, the top of material scraping plate 107 is provided with coolant inlet and coolant outlet, the inside of material scraping plate 107
It is provided with the coolant circulation passage that both ends are connected with coolant inlet and coolant outlet.
More specifically, the cooling agent for being passed through material scraping plate 107 can be water.
More specifically, the shell of top expects pipe and lower part expects pipe is made of heat-resistance stainless steel plate, heat-resistance stainless steel plate it is interior
Surface is corundum castable.
More specifically, the thickness of the heat-resistance stainless steel plate of the shell of top expects pipe and lower part expects pipe is 5mm, corundum castable
Thickness be 50mm~100mm.
More specifically, feed inlet 101 is arranged at 106 top 15cm~25cm of ring-shaped furnace bottom.
More specifically, heat power engineering system includes multiple burners, which is arranged on the corresponding furnace wall side wall in high temperature reduction area 104
On, for being heated to material in stove.
More specifically, setting discharging mechanism on discharge zone, discharging mechanism is connected with discharge port 102, goes out for rotary hearth furnace
Material.
The invention also discloses a kind of method of rotary hearth furnace flue gas utilization, following steps are specifically included：
S1, the feeding mechanism 200 of rotary hearth furnace 100 and seal silo 5 (including about two the first connected seal silos and
Second seal silo) material is filled, the valve of seal silo 5 is simultaneously closed off, and then seal the top of feeding mechanism 200；
S2, material are rotated in the ring-shaped furnace bottom 106 of rotary hearth furnace 100, by high temperature reduction area 104,105 heel row of cooling zone
Go out, fuel gas buring and the material reduce the flue gas produced in the direction of motion and ring-shaped furnace bottom 106 in the rotary hearth furnace 100
Material movement direction enters from the lower end of feeding mechanism 200 on the contrary, under the action of smoke exhaust mechanism 300, through cold conditions material,
Waste heat is passed into cold conditions material, when the cold conditions material is preheated to certain temperature, the CO gases in the flue gas are by described in
Ferriferous oxide or the reduction of other metal oxides in cold conditions material；
When S3, the flue gas are through the material to 200 upper end of feeding mechanism, discharged through the smoke exhaust mechanism 300, into
Enter in dryer 2；
The water-containing materials that S4, the flue gas enter in dryer 2 with the dryer feeding mouth conduct heat, described to contain
Moisture evaporation is water vapour in water material, and the flue gas is discharged with the water vapour from the exhanst gas outlet；
S5, the flue gas of exhanst gas outlet discharge and the water vapour are successively through the deduster 601, air-introduced machine
602 and the chimney 603 discharge.
More specifically, about 1000 DEG C~1300 DEG C of the temperature of the flue gas in the rotary hearth furnace 100.
More specifically, the cold conditions material is preheated to 800 DEG C~1200 DEG C by the fume afterheat.
More specifically, the flue-gas temperature that the smoke exhaust mechanism 300 is discharged is down to 300 DEG C~450 DEG C.
More specifically, the temperature for the flue gas that the exhanst gas outlet in the dryer 2 is discharged is down to 120 DEG C~200 DEG C.
Specific embodiment：
Embodiment 1：
The feeding mechanism 200 and seal silo 5 of rotary hearth furnace 100 fill hematite carbonaceous pelletizing, simultaneously close off sealing material
The valve in storehouse 5, and then the top of feeding mechanism 200 is sealed, be conducive to arrange outside 100 flue gas of rotary hearth furnace.Hematite carbonaceous pelletizing by
For 200 cloth of feeding mechanism on the ring-shaped furnace bottom 106 of rotary hearth furnace 100, ring-shaped furnace bottom 106 carries hematite carbonaceous pelletizing rotation, warp
Discharged after crossing high temperature reducing zone 104, cooling zone 105.Flue gas is produced in burning and reduction process, 1180 DEG C of flue-gas temperature, CO contain
Measure as 6%, under the action of smoke exhaust mechanism 300, enter from the lower end of feeding mechanism 200, through cold conditions material, waste heat is transmitted
Cold conditions material is given, when reaching 600 DEG C, the CO gases in flue gas reduce the di-iron trioxide in hematite carbonaceous pelletizing, reduction
Flue gas afterwards reaches 200 upper end of feeding mechanism, is discharged under the action of the air-introduced machine of smoke exhaust mechanism 300, into dryer 2,
At this moment cold conditions material is preheated to 1100 DEG C by fume afterheat, and the flue-gas temperature that smoke exhaust mechanism 300 is discharged is down to 350 DEG C
After flue gas enters dryer 2, with the aqueous hematite carbonaceous pelletizing from the entrance of the dryer feeding mouth of dryer 2 into
Row heat transfer, the moisture in aqueous hematite carbonaceous pelletizing is volatilized in the form of water vapour, flue gas is together with the water vapour of generation
Discharged from exhanst gas outlet, the temperature of the flue gas of the exhanst gas outlet discharge in dryer 2 is down to 180 DEG C.
Under the action of the air-introduced machine 602 of flue system 6, flue gas first carries out dedusting through deduster 601, then through chimney
603 discharges.Hematite carbonaceous pelletizing after drying is after the dryer discharge port discharge of dryer 2, into belt transportation system
3, it is transported to buffer bin 4 and stores.The hematite carbonaceous pelletizing that buffer bin 4 stores regularly is filled to two seal silos 5
Material.
Embodiment 2：
The feeding mechanism 200 and seal silo 5 of rotary hearth furnace 100 fill hematite carbonaceous pelletizing, simultaneously close off sealing material
The valve in storehouse 5, and then the top of feeding mechanism 200 is sealed, be conducive to arrange outside 100 flue gas of rotary hearth furnace.Hematite carbonaceous pelletizing by
For 200 cloth of feeding mechanism on the ring-shaped furnace bottom 106 of rotary hearth furnace 100, ring-shaped furnace bottom 106 carries hematite carbonaceous pelletizing rotation, warp
Discharged after crossing high temperature reducing zone 104, cooling zone 105.Flue gas is produced in burning and reduction process, 1300 DEG C of flue-gas temperature, CO contain
Measure as 6%, under the action of smoke exhaust mechanism 300, enter from the lower end of feeding mechanism 200, through cold conditions material, waste heat is transmitted
Cold conditions material is given, when reaching 600 DEG C, the CO gases in flue gas reduce the di-iron trioxide in hematite carbonaceous pelletizing, reduction
Flue gas afterwards reaches 200 upper end of feeding mechanism, is discharged under the action of the air-introduced machine of smoke exhaust mechanism 300, into dryer 2,
At this moment cold conditions material is preheated to 1200 DEG C by fume afterheat, and the flue-gas temperature that smoke exhaust mechanism 300 is discharged is down to 450 DEG C
After flue gas enters dryer 2, with the aqueous hematite carbonaceous pelletizing from the entrance of the dryer feeding mouth of dryer 2 into
Row heat transfer, the moisture in aqueous hematite carbonaceous pelletizing is volatilized in the form of water vapour, flue gas is together with the water vapour of generation
Discharged from exhanst gas outlet, the temperature of the flue gas of the exhanst gas outlet discharge in dryer 2 is down to 200 DEG C.
Under the action of the air-introduced machine 602 of flue system 6, flue gas first carries out dedusting through deduster 601, then through chimney
603 discharges.Hematite carbonaceous pelletizing after drying is after the dryer discharge port discharge of dryer 2, into belt transportation system
3, it is transported to buffer bin 4 and stores.The hematite carbonaceous pelletizing that buffer bin 4 stores regularly is filled to two seal silos 5
Material.
Embodiment 3：
The feeding mechanism 200 and seal silo 5 of rotary hearth furnace 100 fill hematite carbonaceous pelletizing, simultaneously close off sealing material
The valve in storehouse 5, and then the top of feeding mechanism 200 is sealed, be conducive to arrange outside 100 flue gas of rotary hearth furnace.Hematite carbonaceous pelletizing by
For 200 cloth of feeding mechanism on the ring-shaped furnace bottom 106 of rotary hearth furnace 100, ring-shaped furnace bottom 106 carries hematite carbonaceous pelletizing rotation, warp
Discharged after crossing high temperature reducing zone 104, cooling zone 105.Flue gas is produced in burning and reduction process, 1000 DEG C of flue-gas temperature, CO contain
Measure as 6%, under the action of smoke exhaust mechanism 300, enter from the lower end of feeding mechanism 200, through cold conditions material, waste heat is transmitted
Cold conditions material is given, when reaching 600 DEG C, the CO gases in flue gas reduce the di-iron trioxide in hematite carbonaceous pelletizing, reduction
Flue gas afterwards reaches 200 upper end of feeding mechanism, is discharged under the action of the air-introduced machine of smoke exhaust mechanism 300, into dryer 2,
At this moment cold conditions material is preheated to 800 DEG C by fume afterheat, and the flue-gas temperature that smoke exhaust mechanism 300 is discharged is down to 300 DEG C
After flue gas enters dryer 2, with the aqueous hematite carbonaceous pelletizing from the entrance of the dryer feeding mouth of dryer 2 into
Row heat transfer, the moisture in aqueous hematite carbonaceous pelletizing is volatilized in the form of water vapour, flue gas is together with the water vapour of generation
Discharged from exhanst gas outlet, the temperature of the flue gas of the exhanst gas outlet discharge in dryer 2 is down to 120 DEG C.
Under the action of the air-introduced machine 602 of flue system 6, flue gas first carries out dedusting through deduster 601, then through chimney
603 discharges.Hematite carbonaceous pelletizing after drying is after the dryer discharge port discharge of dryer 2, into belt transportation system
3, it is transported to buffer bin 4 and stores.The hematite carbonaceous pelletizing that buffer bin 4 stores regularly is filled to two seal silos 5
Material.
Illustrated in the present invention by taking bloodstone as an example, but this technical solution be equally applicable to other materials such as chromite,
Laterite nickel, metallurgical solid waste etc., to realize above-mentioned technical purpose and reach corresponding technique effect.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (10)
- A kind of 1. rotary hearth furnace flue gas utilization system, it is characterised in that including rotary hearth furnace system and dryer,The rotary hearth furnace system includes rotary hearth furnace and rotary hearth furnace material-feeding mechanism, the rotary hearth furnace material-feeding mechanism include feeding mechanism and Smoke exhaust mechanism, the rotary hearth furnace include inlet port and outlet port；Wherein,The feeding mechanism connects the feed inlet, and the smoke exhaust mechanism is arranged on the tube wall of the feeding mechanism simultaneously and described Feeding mechanism connects the rotary hearth furnace through same passage；The dryer includes gas inlet and exhanst gas outlet, and the gas inlet is connected with the smoke exhaust mechanism.
- 2. rotary hearth furnace flue gas utilization system as claimed in claim 1, it is characterised in that the rotary hearth furnace flue gas utilization system is also Including：Belt transportation system, buffer bin, seal silo, flue system；The buffer bin includes feed bin feed inlet and feed bin discharge hole；Described belt transportation system one end connects the dryer discharge port of the dryer, and the other end connects the feed bin charging Mouthful；The bin outlet is connected above the seal silo, lower section connects the feeding mechanism；The flue system includes deduster, air-introduced machine and chimney, and described deduster one end connects the exhanst gas outlet, the other end It is sequentially connected the air-introduced machine and the chimney.
- 3. rotary hearth furnace flue gas utilization system as claimed in claim 1, it is characterised in thatThe feeding mechanism includes top expects pipe and lower part expects pipe, and the top expects pipe and the lower part expects pipe are tightly connected；Institute Stating the top of top expects pipe has feed openings, and the bottom of the lower part expects pipe has discharge openings, the discharge openings connection The feed inlet of the rotary hearth furnace；The smoke exhaust mechanism has bleeding point and gas outlet, and the bleeding point is communicated to the top expects pipe；The gas outlet connects Lead to the gas inlet of the dryer, the smoke exhaust mechanism be used to flue gas being evacuated in the feeding mechanism by rotary hearth furnace and from The gas outlet is expelled in the dryer.
- 4. rotary hearth furnace flue gas utilization system as claimed in claim 2, it is characterised in thatThe seal silo includes the first seal silo and the second seal silo for the speed for being used to control charging；Described first is close Envelope feed bin is arranged on above second seal silo, has feed inlet sealed valve at the top of the first seal silo, and described First seal silo is connected with second seal silo by the first sealed valve；Second seal silo and the charging Mechanism is connected by the second sealed valve.
- 5. rotary hearth furnace flue gas utilization system as claimed in claim 1, it is characterised in thatThe rotary hearth furnace further includes annular furnace body, ring-shaped furnace bottom, furnace bottom transmission mechanism, the thermal technology system for being heated for rotary hearth furnace System, the rotary hearth furnace material-feeding mechanism further include barricade and material scraping plate；The annular furnace body is circumferentially disposed with loading area, high temperature reduction area, cooling zone and discharge zone, and the feed inlet is set Put and be arranged on the discharge zone in the loading area, the discharge port；The ring-shaped furnace bottom is correspondingly arranged at the lower section of the annular furnace body, ring-shaped furnace bottom supported by the furnace bottom transmission mechanism and with The furnace bottom transmission mechanism drives to be rotated from the direction in the loading area to the high temperature reduction area；The feed inlet is arranged on institute State above ring-shaped furnace bottom and be more than fabric thickness with the distance between the ring-shaped furnace bottom；The barricade includes the first barricade and the second barricade, be arranged on the furnace roof of the annular furnace body and with the furnace bottom Cloth does not contact；The material scraping plate is radially arranged between the discharge openings of feeding mechanism and the high temperature reduction area, and is fixed on the ring On the furnace roof of shape furnace body, the material scraping plate is adjustable to the distance between described ring-shaped furnace bottom and is equal to the fabric thickness.
- 6. rotary hearth furnace flue gas utilization system as claimed in claim 5, it is characterised in thatThe material scraping plate of the loading area and high temperature reduction area radial direction separates, the loading area and the discharge zone it Between separated with the first barricade of radial direction, separated between the high temperature reduction area and the cooling zone with the second barricade of radial direction.
- 7. a kind of method that the rotary hearth furnace fume afterheat of any system utilizes in 1-6 using claim, including following step Suddenly：S1, the feeding mechanism of rotary hearth furnace and seal silo fill material, simultaneously close off the valve of seal silo, and then seal institute State the top of feeding mechanism；S2, material are rotated in ring-shaped furnace bottom, are discharged behind high temperature reduction area, cooling zone, fuel gas buring and material reduction The flue gas of generation in the direction of motion and furnace bottom in the rotary hearth furnace material movement direction on the contrary, smoke exhaust mechanism effect Under, enter from the lower end of feeding mechanism, through cold conditions material, waste heat is passed into cold conditions material, the cold conditions material is preheated During to certain temperature, CO gases in the flue gas by the ferriferous oxide in the cold conditions material or other metal oxides also It is former；When S3, the flue gas are through the material to the feeding mechanism upper end, discharged through the smoke exhaust mechanism, into dryer In；The water-containing materials that S4, the flue gas enter in dryer with dryer feeding mouth conduct heat, in the water-containing materials Moisture evaporation is water vapour, and the flue gas is discharged with the water vapour from the exhanst gas outlet；S5, the flue gas of exhanst gas outlet discharge and the water vapour are discharged through deduster, air-introduced machine and chimney successively.
- 8. the method that rotary hearth furnace fume afterheat as claimed in claim 7 utilizes, it is characterised in that the flue gas in the rotary hearth furnace About 1000 DEG C~1300 DEG C of temperature.
- 9. the method that rotary hearth furnace fume afterheat as claimed in claim 7 utilizes, it is characterised in that the cold conditions material is described Fume afterheat is preheated to 800 DEG C~1200 DEG C.
- 10. the method that rotary hearth furnace fume afterheat as claimed in claim 7 utilizes, it is characterised in that the smoke exhaust mechanism discharge Flue-gas temperature be down to 300 DEG C~450 DEG C, the temperature of the flue gas of the exhanst gas outlet discharge in the dryer be down to 120 DEG C~ 200℃。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711470390.9A CN108020084A (en) | 2017-12-29 | 2017-12-29 | A kind of rotary hearth furnace smoke waste heat utilization system and method |
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| CN201711470390.9A CN108020084A (en) | 2017-12-29 | 2017-12-29 | A kind of rotary hearth furnace smoke waste heat utilization system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579536A (en) * | 2018-12-29 | 2019-04-05 | 宁夏宁平炭素有限责任公司 | High-efficient energy-saving environment friendly electrode paste raw material high-temperature calcination equipment |
| CN113091452A (en) * | 2021-04-14 | 2021-07-09 | 中冶赛迪技术研究中心有限公司 | Configuration method of combustion system of rotary hearth furnace |
-
2017
- 2017-12-29 CN CN201711470390.9A patent/CN108020084A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109579536A (en) * | 2018-12-29 | 2019-04-05 | 宁夏宁平炭素有限责任公司 | High-efficient energy-saving environment friendly electrode paste raw material high-temperature calcination equipment |
| CN109579536B (en) * | 2018-12-29 | 2023-11-24 | 宁夏宁平炭素有限责任公司 | High-temperature calcining equipment for high-efficiency energy-saving environment-friendly electrode paste raw material |
| CN113091452A (en) * | 2021-04-14 | 2021-07-09 | 中冶赛迪技术研究中心有限公司 | Configuration method of combustion system of rotary hearth furnace |
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