CN105907405A - Rotary hearth furnace and method for treating low-rank coal and iron-containing materials - Google Patents
Rotary hearth furnace and method for treating low-rank coal and iron-containing materials Download PDFInfo
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- CN105907405A CN105907405A CN201610431959.XA CN201610431959A CN105907405A CN 105907405 A CN105907405 A CN 105907405A CN 201610431959 A CN201610431959 A CN 201610431959A CN 105907405 A CN105907405 A CN 105907405A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B1/00—Retorts
- C10B1/10—Rotary retorts
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
Abstract
The invention discloses a rotary hearth furnace and method for treating low-rank coal and iron-containing materials. Specifically, the rotary hearth furnace comprises a rotary furnace bottom, a ring-shaped hearth, a first retaining wall, a second retaining wall, a low-rank coal inlet, an iron-containing material inlet, a chain plate device, a pyrolysis oil gas outlet and a reduction product outlet, wherein a pyrolysis area, a reduction area and a discharge area are sequentially formed in the rotating direction of the rotary furnace bottom, a first gap is formed between the bottom end of the first retaining wall and the rotary furnace bottom, a second gap is formed between the bottom end of the second retaining wall and the rotary furnace bottom, and the chain plate device is arranged in the pyrolysis area. Accordingly, the low-rank coal can be utilized comprehensively, pyrolysis oil gas is prevented from being polluted by reducing gas or volatile components generated in the treatment process, and the rotary hearth furnace has at least one of the following advantages of being low in production cost, high in reduction product and pyrolysis oil gas quality, good in economic benefits and the like.
Description
Technical field
The present invention relates to metallurgy and chemical field.In particular it relates to process low-disintegration coal and the rotary hearth furnace of ferrous material
And method.
Background technology
China's richness coal, gas oil-poor, few the energy consumption structure of energy reserve conditional decision China based on coal.Low change
Matter coal, including brown coal, jet coal, dross coal, weakly caking coal etc., because moisture is high, ash is high, volatile matter is high, calorific value is low
Shortcoming, is commonly used for low-grade fuel thermal coal.Low-disintegration coal easily aoxidizes, spontaneous combustion, should not transport for long-distance, and also increases it
The difficulty of processing and utilization.Therefore, how to realize conversion and the comprehensive utilization of low-disintegration coal resource, be the weight in coal chemical industry
Want problem.
But, the method and apparatus currently with low-disintegration coal still haves much room for improvement.
Summary of the invention
The application is to make following facts and the discovery of problem and understanding based on inventor:
Current low-disintegration coal processing means, exists that production cost is higher, product economy benefit is poor, product cannot be direct more
Utilize, need the problems such as complicated subsequent treatment.Inventor finds through further investigation and great many of experiments, this mainly by
In low-disintegration coal complicated component, as directly utilized low-disintegration coal as products such as reduction raw material, the then coal gas obtained, coal tar
Difficult quality guarantee, it is therefore desirable to the product quality that complicated subsequent treatment obtains to improve low-disintegration coal to process；And as wanted
Obtain the low-disintegration coal process product that quality is higher, have good economic benefit, then need low-disintegration coal raw material is carried out upgrading
Recycle afterwards.
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the present invention proposes one
Plant and process low-disintegration coal and the rotary hearth furnace of ferrous material.Low-disintegration coal is processed and is combined with ferrous material reduction process by this rotary hearth furnace,
Low-disintegration coal can be directly utilized as raw material, after rotary hearth furnace processes, directly obtain the iron content gold of pyrolysis oil gas and reduction
Belong to product.Utilizing this rotary hearth furnace can realize the comprehensive utilization of low-disintegration coal, directly employing low-disintegration coal is as raw material, in heat
Xie Qu makes low-disintegration coal upgrading, it is thus achieved that pyrolysis oil gas and coke, wherein, coke can be as the reduction of follow-up ferrous material
Agent.Thus, it is possible to utilize same set of device to realize the process of low-disintegration coal and the reduction of ferrous material, obtain pyrolysis simultaneously
Oil gas and reducing metal product, have that production cost is relatively low, reduzate and pyrolysis oil makings amount is higher, economic benefit relatively
At least one the advantage such as good.
In one aspect of the invention, the present invention proposes a kind of rotary hearth furnace processing low-disintegration coal and ferrous material.According to this
Inventive embodiment, this rotary hearth furnace includes: at the bottom of rotatable stove；Annular furnace, in described annular furnace, turns along described
The rotation direction of dynamic furnace bottom sequentially forms pyrolysis zone, reducing zone and discharge zone；First barricade, described first barricade is along institute
State being radially arranged between described pyrolysis zone and described reducing zone of annular furnace, and the bottom of described first barricade is with described
There is between at the bottom of rotatable stove the first gap；Second barricade, described second barricade being radially arranged in along described annular furnace
Between described discharge zone and described pyrolysis zone, and at the bottom of the bottom of described second barricade and described rotatable stove between have second
Gap；Low-disintegration coal entrance, described low-disintegration coal entrance is arranged on described pyrolysis zone；Ferrous material entrance, described chalybeate
Material entrance is arranged on described reducing zone；Chain plate device, described chain plate device is arranged on described pyrolysis zone, and described carrier bar dress
The discharge end put is connected with described low-disintegration coal entrance near described first barricade, described chain plate device；Pyrolysis oil gas vent,
Described pyrolysis oil gas vent is arranged on described pyrolysis zone and near described first barricade；And reduzate outlet, described reduction
Product exit is arranged on described discharge zone.Thus, this rotary hearth furnace can realize the comprehensive utilization of low-disintegration coal, by low-disintegration coal
Processing procedure is combined with ferrous material reduction process, is pyrolyzed the reducibility gas or volatility produced during oil gas is not subject to processing
Composition pollutes, have that production cost is relatively low, the advantage such as reduzate and higher, the better economic benefit of pyrolysis oil makings amount extremely
One of few.
According to embodiments of the invention, described chain plate device is parallel at the bottom of described rotatable stove arrange.Thus, it is possible to further
Raising processes efficiency and the effect of low-disintegration coal.
It is 5～15cm according to the distance between at the bottom of embodiments of the invention, described chain plate device and described rotatable stove.Thus,
Efficiency and the effect processing low-disintegration coal can be improved further.
According to embodiments of the invention, described chain plate device is 8～12cm with the spacing at the bottom of described rotatable stove.Thus, may be used
Efficiency and the effect of low-disintegration coal is processed with further raising.
According to embodiments of the invention, the height in described first gap is 12～30mm.Thus, it is possible to make thermal decomposition product smooth
Supplied to reducing zone by the first gap, and effectively by spaced apart to pyrolysis zone and reducing zone, to prevent reducing zone from generating
Gaseous contamination pyrolysis oil gas.
According to embodiments of the invention, the height in described first gap is 15～22mm.Thus, it is possible to raising processes further
The efficiency of low-disintegration coal and effect.
According to embodiments of the invention, the discharge end of described chain plate device is 15～40mm with the distance of described first barricade.By
This, can extend the length of chain plate device as far as possible, extends low-disintegration coal in pyrolysis zone residence time.
According to embodiments of the invention, the discharge end of described chain plate device is 18～32mm with the distance of described first barricade.By
This, can improve pyrolysis zone further and process the effect of low-disintegration coal.
In another aspect of this invention, the present invention proposes one and utilizes foregoing rotary hearth furnace process low-disintegration coal and iron content
The method of material.According to embodiments of the invention, the method includes: low-disintegration coal is supplied by (1) by low-disintegration coal entrance
To described chain plate device, in order to described low-disintegration coal occurs pyrolytic reaction in described pyrolysis zone, it is thus achieved that semicoke and pyrolysis
Oil gas；(2) described semicoke is supplied to reducing zone, and ferrous material is supplied to described semicoke by ferrous material entrance,
So that described ferrous material reacts with described semicoke, it is thus achieved that reduzate.Thus, it is possible to low-disintegration coal is processed and contains
Ferrum material reduction process combines, and the method has process, and step is simple, production cost is relatively low, reduzate and pyrolysis oil makings
Measure higher, better economic benefit, be prone to the advantages such as large-scale promotion application at least one.
According to embodiments of the invention, the particle diameter of described low-disintegration coal is 8-14mm.Thus, it is possible to improve low rotten further
Coal generation pyrolytic reaction and ferrous material reduction efficiency and effect.
According to embodiments of the invention, the particle diameter of described ferrous material is 6-10mm.Thus, it is possible to improve low rotten further
Coal generation pyrolytic reaction and ferrous material reduction efficiency and effect.
According to embodiments of the invention, in described low-disintegration coal, fixed carbon content is not less than 37wt%.Thus, it is possible to further
Improve low-disintegration coal generation pyrolytic reaction and the efficiency of ferrous material reduction and effect.
According to embodiments of the invention, the grade of described ferrous material is not less than 35wt%.Thus, it is possible to improve low further
Deterioration coal generation pyrolytic reaction and ferrous material reduction efficiency and effect.
According to embodiments of the invention, in described low-disintegration coal, fixed carbon with the mol ratio of ferrum element in described ferrous material is
1:2～6.Thus, it is possible to improve low-disintegration coal generation pyrolytic reaction and the efficiency of ferrous material reduction and effect further,
Low-disintegration coal the pyrolysis insufficient or ferrous material reduction preventing low-disintegration coal or ferrous material excess and cause is insufficient.
Accompanying drawing explanation
Fig. 1 shows rotary hearth furnace plan structure schematic diagram according to an embodiment of the invention；
Fig. 2 shows rotary hearth furnace part-structure schematic diagram according to an embodiment of the invention；
Fig. 3 shows rotary hearth furnace part-structure schematic diagram in accordance with another embodiment of the present invention；And
Fig. 4 shows the schematic flow sheet of the method processing low-disintegration coal and ferrous material according to an embodiment of the invention.
Description of reference numerals:
At the bottom of rotatable stove 100；Annular furnace 200；Pyrolysis zone 300；Reducing zone 400；Discharge zone 500；First barricade 600；
Second barricade 700；Chain plate device 800
First gap 610；Low-disintegration coal entrance 10；Low-disintegration coal 1；Ferrous material entrance 20；Ferrous material 2；Pyrolysis oil
Gas outlet 30；Reduzate outlet 40.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings.Below with reference to accompanying drawing
The embodiment described is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
In one aspect of the invention, the present invention proposes a kind of rotary hearth furnace processing low-disintegration coal and ferrous material.According to this
Inventive embodiment, with reference to Fig. 1, this rotary hearth furnace includes: at the bottom of rotatable stove 100, annular furnace 200, pyrolysis zone 300,
Reducing zone 400, discharge zone the 500, first barricade the 600, second barricade 700 and chain plate device 800.
Specifically, with reference to Fig. 1～Fig. 3, at the bottom of rotatable stove, 100 are arranged on the bottom of annular furnace 200, along rotatable stove
The rotation direction at the end 100, is sequentially formed with pyrolysis zone 300, reducing zone 400 and discharge zone 500 in annular furnace 200.
Wherein, low-disintegration coal entrance 10 and chain plate device 800 are arranged in pyrolysis zone 300.Chain plate device 800 and low-disintegration coal
Entrance 10 is connected, and discharge end is arranged near the first barricade 600.Thus, low-disintegration coal 1 is supplied by low-disintegration coal entrance 10
On chain plate device 800, and move in pyrolysis zone 300 with chain plate device, occur pyrolytic reaction, the pyrolysis oil gas of generation by
Pyrolysis oil gas vent 30 discharges rotary hearth furnace, and semicoke falls at the bottom of rotatable stove on 100 with the discharge end by chain plate device 800.
First barricade 600 being radially arranged between pyrolysis zone 300 and reducing zone 400 along annular furnace 200, and first gear
There is between 100 at the bottom of the bottom of wall 600 and rotatable stove the first gap 610.It should be noted that in the present invention, " edge
Being radially arranged of annular furnace 200 " represent, the first barricade 600 is vertically disposed in annular furnace, and along annular
The direction of burner hearth 200 diameter, crosses internal ring and the outer shroud of annular furnace 200, by the pyrolysis zone 300 in annular furnace 100
And reducing zone 400 is spaced apart.According to embodiments of the invention, along with the rotation of 800 at the bottom of rotatable stove, semicoke is by first
At gap 610, supply is to reducing zone 400.Now, ferrous material 2 is supplied to reducing zone 400 by ferrous material entrance 20,
Being distributed in semicoke top, utilize semicoke reduction ferrous material, reduzate is exported by the reduzate being arranged on discharge zone 500
40 discharge rotary hearth furnace.Thus, it is possible to realize the comprehensive utilization of low-disintegration coal, by low-disintegration coal processing procedure with ferrous material also
Former process combines, and due to the first barricade 600 and the second barricade 700 by pyrolysis zone 300 and reducing zone 400 at ring
Shape burner hearth 200 has been separated into relatively independent two region, the reproducibility that therefore pyrolysis oil gas produces during not being subject to processing
Gas or volatile ingredient pollute.This rotary hearth furnace process low-disintegration coal and ferrous material is utilized to have production cost relatively low, also
At least one the original advantage such as thing and higher, the better economic benefit of pyrolysis oil makings amount.
Below according to embodiments of the invention, the various piece of above-mentioned rotary hearth furnace is described in detail.
According to embodiments of the invention, the temperature of pyrolysis zone 300 can be 400～600 degrees Celsius, and low-disintegration coal is in pyrolysis zone
The time of staying of 300 can be 15～30 minutes, in order to low-disintegration coal occurs pyrolytic reaction in pyrolysis zone 300.Supply is to heat
The low-disintegration coal solving district 300 can be brown coal, jet coal, dross coal, weakly caking coal etc., and the granularity of low-disintegration coal can be
8～14mm, thus, it is possible to improve efficiency and the effect of low-disintegration coal pyrolysis.For it will be appreciated to those of skill in the art that
Owing to pyrolysis zone 300 and reducing zone 400 need higher temperature there is pyrolysis or reduction reaction, therefore rotatable stove
The end 100 and be arranged on pyrolysis zone 300, the related device of reducing zone 400 or parts and be required to high temperature resistant.Such as, may be used
At the bottom of rotary furnace, 100 can be made up of refractory material.
Chain plate device 800 is parallel at the bottom of rotatable stove 100 and arranges.Inventor finds through further investigation and great many of experiments,
As being not provided with chain plate device 800, directly by low-disintegration coal 1 cloth at the bottom of rotatable stove 100, due at the bottom of rotatable stove 100
In the bottom cycle rotation of annular furnace 200, a small amount of salvage stores not discharging rotary hearth furnace in discharge zone 500 can stay stove
In, turn again to pyrolysis zone 300 with the rotation of 100 at the bottom of rotatable stove, then the ferrous material meeting that remains and have just enter into pyrolysis zone
The low-disintegration coal of 300 reacts, and produces gas or other materials, thus affects the purity of the pyrolysis oil gas of collection.And
After pyrolysis zone 300 arranges chain plate device 800, then can keep apart at the bottom of low-disintegration coal and rotatable stove 100, to ensure heat
The purity of hydrolysis products is unaffected.Specifically, distance between 100 at the bottom of chain plate device 800 and rotatable stove can be
5～15cm, preferably at the bottom of chain plate device 800 and rotatable stove, the spacing of 100 is 8～12cm.Chain plate device 800 excessively leans on
At the bottom of nearly rotatable stove 100, would interfere with the rotation of 100 at the bottom of rotatable stove, and the hypertelorism of 100 at the bottom of distance rotatable stove,
When then the pyrogenous origin semicoke of low-disintegration coal 1 is fallen at the bottom of rotatable stove 100 by the discharge end of chain plate device 800 drop away from
From long.The direction of motion of chain plate device 800 is identical with the rotation direction of 100 at the bottom of rotatable stove, and with reference to Fig. 3, carrier bar fills
Put 800 100 to rotate each along direction shown in arrow in Fig. 3 at the bottom of rotatable stove.When low-disintegration coal 1 is supplied to carrier bar
Time on device 800, low-disintegration coal 1 can be controlled in pyrolysis zone 300 by the transmission speed of Quality Initiative panel assembly 800
The time of staying.Thus, it is possible to make low-disintegration coal 1 that pyrolytic reaction fully to occur.According to embodiments of the invention, in order to enter
One step improves the pyrolysis efficiency of low-disintegration coal 1, and it is the longest that the length of chain plate device 800 can be arranged.For example, it is possible to
The feeding end of chain plate device 800 and low-disintegration coal entrance 10 are arranged on the initial segment of pyrolysis zone 300, by chain plate device
The discharge end of 800 is positioned close at the first barricade 600.Specifically, the discharge end of chain plate device 800 and the first barricade 600
Distance can be 15～40mm, it is preferable that the discharge end of chain plate device 800 and the distance of the first barricade 600 can be
18～32mm.Above-mentioned apart from narrow, then thermal decomposition product can be hindered to drop at the bottom of rotatable stove 100 smoothly and to enter reducing zone 400；
If apart from wide, then the length of chain plate device 800 can be caused to reduce.Thus, it is possible to extend the length of chain plate device 800 as far as possible
Degree, thus extend low-disintegration coal in pyrolysis zone 300 residence time, process low such that it is able to improve pyrolysis zone 300 further
The effect of deterioration coal.
According to embodiments of the invention, the height in the first gap 610 can be 12～30mm, it is preferable that the first gap 610
Height be 15～22mm.Thus, it is possible to make thermal decomposition product, i.e. semicoke passes through the first gap 610 and supplies to reducing zone
400, and effectively by spaced apart to pyrolysis zone 300 and reducing zone 400, hinder the flow of flue gas between twoth district, to prevent also
The gaseous contamination pyrolysis oil gas that former district 400 generates.
According to embodiments of the invention, process the effect of low-disintegration coal to improve this rotary hearth furnace further, improve thermal decomposition product
Quality, oil gas collecting device can be set at the latter end of pyrolysis zone 300, in order to by the pyrolysis oil gas collected by pyrolysis
Oil gas vent 30 discharges rotary hearth furnace.Additionally, in order to prevent air from entering rotary hearth furnace, low-disintegration coal is processed and adversely affects,
It is in pressure-fired in can making the annular furnace 200 of rotary hearth furnace.
According to embodiments of the invention, it is defocused that low-disintegration coal 1 is pyrolyzed production half in pyrolysis zone 300, and semicoke drops and can turn
On dynamic furnace bottom 100, supply to reducing zone 400 in the first gap 610.At this point it is possible to by ferrous material by ferrous material
Entrance 20 supplies to reducing zone 400 also cloth on semicoke.Thus, it is possible to utilize semicoke to react with ferrous material, it is thus achieved that
Reduzate.Specifically, ferrous material entrance 20 can be arranged on the initial segment of reducing zone, in order to ferrous material is in reduction
Within district 400, residence time is the longest so that it is fully react with semicoke.It is 6～10mm that ferrous material can make particle diameter
Pelletizing, the temperature of reducing zone 400 can be 1000～1400 degrees Celsius, by controlling the rotation speed of at the bottom of rotatable stove 100
Degree, making ferrous material and semicoke is 30～60 minutes in reducing zone residence time, thus, it is possible to improve iron content further
The efficiency of material generation reduction reaction and effect.The reduzate generated enters discharge zone 300 with at the bottom of rotatable stove 100,
By reduzate outlet 40 discharge rotary hearth furnace.
According to embodiments of the invention, the second barricade 700 is radially arranged in discharge zone 500 and heat along annular furnace 200
Solve between district 300, there is between 100 at the bottom of the bottom of the second barricade 700 and rotatable stove the second gap (not shown).
The second barricade 700 that " along the radial direction of annular furnace 200 " is arranged has the set-up mode similar to the first barricade 600,
Do not repeat them here.Thus, it is possible to reducing zone 400, discharge zone 500 are separated with pyrolysis zone 300, prevent further
The flue gas of reducing zone 400 enters pyrolysis zone 300, thereby may be ensured that purity and the quality of the pyrolysis smoke of pyrolysis zone 300.
It should be noted that in the present invention, the second barricade 700 should be interpreted broadly, and it both can be the barricade of narrow sense, it is possible to
Think and potentially act as barricade, the structure stopping flow of flue gas or equipment.Such as, the second barricade 700 can be spiral discharging device
Deng device or parts.Thus, it is possible to utilize the second barricade 700 realize discharging and stop the function of flue gas circulation.Need
Bright, in the present invention, the height in the second gap is not particularly limited, if make the second barricade 700 not with rotatable stove
The end 100, directly contacts, and does not hinder the normal rotation of 100 at the bottom of rotatable stove to work.
According to embodiments of the invention, this rotary hearth furnace is utilized to process low-disintegration coal and the effect of ferrous material in order to improve further
Rate and effect, can supply reduzate to dry concentration equipment, separating reducing product, in order to obtain reduction containing iron ball
Group and unreacted semicoke completely.Unreacted semicoke completely can continue to supply to reducing zone participation reduction reaction.According to
Embodiments of the invention, the degree of metalization of the reduction iron content product obtained after this rotary hearth furnace processes can reach more than 80%.
In sum, the rotary hearth furnace utilizing the present invention to propose processes low-disintegration coal and ferrous material can have following advantages
At least one:
1, can be with integrated treatment low-disintegration coal and ferrous material, available a set of equipment obtains low-disintegration coal thermal decomposition product (coal simultaneously
Gas, coal tar), the degree of metalization that obtains through reduction of high-quality semicoke (can be as the reducing agent of follow-up flow process) and ferrous material
Pelletizing higher than 80%, raw material availability is high, and product economy is profitable.
2, rotary hearth furnace is divided into pyrolysis zone, reducing zone and discharge zone, low-disintegration coal and ferrous material respectively by pyrolysis zone and reduction
The charging aperture in district puts in stove, it is to avoid low-disintegration coal and ferrous material mixing, affects the product quality of thermal decomposition product.
3, pyrolysis zone and reducing zone adjacent arrange barricade, it is achieved effective partition in Liang Ge district, hinder flow of flue gas, prevent also
The flue gas in former district reaches pyrolysis zone, the purity of the pyrolysis oil gas that impact is collected.
4, chain plate device is set in pyrolysis zone, low-disintegration coal cloth rather than is placed directly at the bottom of rotatable stove on carrier bar, permissible
Being prevented effectively from when the ferrous material of completely discharging returns to pyrolysis zone and react with the low-disintegration coal being newly added, impact is collected
The purity of pyrolysis oil gas.
In another aspect of this invention, the present invention proposes one and utilizes previously described rotary hearth furnace process low-disintegration coal and iron content
The method of material.According to embodiments of the invention, with reference to Fig. 4, the method includes:
S100: pyrolytic reaction
According to embodiments of the invention, in this step, low-disintegration coal is supplied to chain plate device by low-disintegration coal entrance,
To there is pyrolytic reaction in pyrolysis zone in low-disintegration coal, it is thus achieved that semicoke and pyrolysis oil gas.Specifically, low-disintegration coal is with chain
Panel assembly moves in pyrolysis zone, and the pyrolysis oil gas of generation is discharged rotary hearth furnace by being pyrolyzed oil gas vent, and semicoke is at the end of pyrolysis zone
At section, close first barricade, the discharge end of chain plate device fall at the bottom of rotatable stove, supply to reducing zone through the first gap
Continue to react.According to embodiments of the invention, the temperature of pyrolysis zone can be 400～600 degrees Celsius, and low-disintegration coal exists
The time of staying of pyrolysis zone can be 15～30 minutes, in order to low-disintegration coal occurs pyrolytic reaction in pyrolysis zone.Supply is to pyrolysis
The low-disintegration coal in district can be with brown coal, jet coal, dross coal, weakly caking coal etc., and the granularity of low-disintegration coal can be 8～14mm,
In low-disintegration coal, fixed carbon content is not less than 37wt%.Thus, it is possible to improve efficiency and the effect of low-disintegration coal pyrolysis.Close
In at the bottom of chain plate device, rotatable stove, the dependency structure of the first barricade and workflow, be previously detailed retouching
State, do not repeat them here.
S200: reduction reaction
According to embodiments of the invention, in this step, pyrogenous origin for low-disintegration coal semicoke is supplied to reducing zone, and will
Ferrous material is supplied to semicoke by ferrous material entrance, in order to ferrous material reacts with semicoke, it is thus achieved that reduzate.
Be combined with ferrous material reduction process thus, it is possible to low-disintegration coal is processed, utilize the semicoke that low-disintegration coal generates as reduction
Agent, it is thus achieved that the degree of metalization of reduction iron content product can reach more than 80%.Specifically, in this step, when semicoke is with can
Supplying at the bottom of rotary furnace after reducing zone, can be supplied by the ferrous material entrance of reducing zone initial segment by ferrous material extremely can
On at the bottom of rotary furnace, ferrous material is made to be evenly distributed in the top of semicoke.In this step, the particle diameter of ferrous material can be
6-10mm.Thus, it is possible to improve low-disintegration coal generation pyrolytic reaction and the efficiency of ferrous material reduction and effect further.
For example, it is possible to ferrous material is prepared as particle diameter be above-mentioned within the scope of iron content pelletizing, the grade of ferrous material is not less than
35wt%.In this step, can control to supply the amount of ferrous material to reducing zone, make low in this rotary hearth furnace of supply
In deterioration coal, fixed carbon is 1:(2～6 with the mol ratio of ferrum element in ferrous material).Thus, it is possible to improve low rotten further
Coal generation pyrolytic reaction and ferrous material reduction efficiency and effect, prevent low-disintegration coal or ferrous material excess and cause
Low-disintegration coal pyrolysis insufficient or ferrous material reduction insufficient.The temperature of reducing zone can be 1000～1400 degrees Celsius,
By controlling the velocity of rotation at the bottom of rotatable stove, making ferrous material and semicoke is 30～60 minutes in reducing zone residence time,
Thus, it is possible to improve efficiency and the effect of ferrous material generation reduction reaction further.The reduzate generated is with rotatably
Furnace bottom enters discharge zone, reduzate outlet discharge rotary hearth furnace.Reduzate can also further across dry concentration equipment,
Being separated with the semicoke reacted the most completely by iron content reduzate, iron content reduzate can be sold directly as chemical products,
The semicoke reacted the most completely can continue supply and use as reducing agent to reducing zone.
The process of low-disintegration coal and ferrous material, therefore the method is carried out owing to this process employs previously described rotary hearth furnace
There are the whole features and advantage possessed when previously described rotary hearth furnace processes low-disintegration coal and ferrous material, at this not
Repeat again.Generally speaking, the method has process step is simple, production cost is relatively low, reduzate and pyrolysis oil makings amount
Higher, better economic benefit, be prone to the advantages such as large-scale promotion application at least one.
Below in conjunction with embodiment, the solution of the present invention is explained.It will be understood to those of skill in the art that following enforcement
Example is merely to illustrate the present invention, and should not be taken as limiting the scope of the invention.Unreceipted concrete technology or condition in embodiment,
According to the technology described by the document in this area or condition or carry out according to product description.Agents useful for same or instrument are not noted
Bright production firm person, be can by city available from conventional products.
Embodiment 1:
With brown coal and iron ore concentrate as raw material, brown coal composition is following (mass percent): moisture 10.19%, ash 1.94%, wave
Send out point 46.53%, fixed carbon content 41.34%.The TFe grade of iron ore concentrate is 72wt%.Brown coal are dried preparation to 8～12mm
Granularity, iron ore concentrate makes pelletizing, and its particle diameter is 6～8mm.First brown coal block is passed through low-disintegration coal entrance cloth in pyrolysis zone
Carrier bar, chain plate device distance bottom refractory material 10cm.Pyrolysis zone temperature 500 DEG C, time 20min.The oil that pyrolysis produces
Gentle by collect segregation apparatus reclaim, tar yield 6.51%, gas yield 20.49%, calorific value of gas is up to 5476.53
Kcal/Nm3.Semicoke after pyrolysis (distance bottom 18mm) at the first barricade drops from carrier bar and enters reducing zone at furnace bottom,
Chain plate device distance the first barricade 18mm.Iron ore pellets is distributed into by charge door, is allowed to contact with semicoke, reduction temperature
Spending 1200 DEG C, time 50min, may finally obtain degree of metalization 85% goes back original product.
Embodiment 2:
With jet coal and iron mine as raw material, coal composition is following (mass percent): moisture 12.03%, ash 2.21%, volatilization
Point 46.31%, fixed carbon content 39.45%, the TFe grade of iron mine is 48wt%.Jet coal is dried preparation to 10～14mm
Granularity, iron mine makes pelletizing, and its particle diameter is 8～10mm.First jet coal is distributed into pyrolysis zone by low-disintegration coal entrance
Carrier bar, chain plate device distance bottom refractory material 15cm.Pyrolysis zone temperature 700 DEG C, time 16min.The oil that pyrolysis produces
Gentle by collect segregation apparatus reclaim, tar yield 5.69%, gas yield 31.28%, calorific value of gas is up to 5697.82
Kcal/Nm3.Semicoke after pyrolysis (distance bottom 26mm) at the first barricade drops from carrier bar and enters reducing zone at furnace bottom,
Chain plate device distance the first barricade 35mm.Iron ore pellets is distributed into by charge door, is allowed to contact with semicoke, reduction temperature
Spending 1300 DEG C, time 40min, may finally obtain degree of metalization 87% goes back original product.
In describing the invention, it is to be understood that term " on ", D score, " top ", the orientation of the instruction such as " end " or position
Relation of putting for based on orientation shown in the drawings or position relationship, be for only for ease of the description present invention and simplifying describe rather than
Instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not
It is interpreted as limitation of the present invention.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", the art such as " fixing "
Language should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be machinery
Connect, it is also possible to be electrical connection or each other can communication；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary,
Can be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.For ability
For the those of ordinary skill in territory, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ",
Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term necessarily
It is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be arbitrary
Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be combined by art personnel
And combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary,
Being not considered as limiting the invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, revises, replaces and modification.
Claims (10)
1. the rotary hearth furnace processing low-disintegration coal and ferrous material, it is characterised in that including:
At the bottom of rotatable stove；
Annular furnace, in described annular furnace, sequentially forms pyrolysis zone, reduction along the rotation direction at the bottom of described rotatable stove
District and discharge zone；
First barricade, described first barricade along described annular furnace be radially arranged in described pyrolysis zone and described reducing zone it
Between, and at the bottom of the bottom of described first barricade and described rotatable stove between there is the first gap；
Second barricade, described second barricade along described annular furnace be radially arranged in described discharge zone and described pyrolysis zone it
Between, and at the bottom of the bottom of described second barricade and described rotatable stove between there is the second gap；
Low-disintegration coal entrance, described low-disintegration coal entrance is arranged on described pyrolysis zone；
Ferrous material entrance, described ferrous material entrance is arranged on described reducing zone；
Chain plate device, described chain plate device is arranged on described pyrolysis zone, and the discharge end of described chain plate device is near described
One barricade, described chain plate device is connected with described low-disintegration coal entrance；
Pyrolysis oil gas vent, described pyrolysis oil gas vent is arranged on described pyrolysis zone and near described first barricade；And
Reduzate exports, and the outlet of described reduzate is arranged on described discharge zone.
Rotary hearth furnace the most according to claim 1, it is characterised in that described chain plate device is parallel at the bottom of described rotatable stove
Arrange,
Optionally, at the bottom of described chain plate device and described rotatable stove between distance be 5～15cm,
Preferably, described chain plate device is 8～12cm with the spacing at the bottom of described rotatable stove.
Rotary hearth furnace the most according to claim 1 and 2, it is characterised in that the height in described first gap is 12～30mm.
Rotary hearth furnace the most according to claim 3, it is characterised in that the height in described first gap is 15～22mm.
Rotary hearth furnace the most according to claim 1, it is characterised in that the discharge end of described chain plate device and described barricade
Distance is 15～40mm.
Rotary hearth furnace the most according to claim 5, it is characterised in that the discharge end of described chain plate device and described barricade
Distance is 18～32mm.
7. utilize the rotary hearth furnace according to any one of claim 1-6 to process low-disintegration coal and a method for ferrous material, its
It is characterised by, including:
(1) by low-disintegration coal by low-disintegration coal entrance supply to described chain plate device, in order to described low-disintegration coal is described
Pyrolysis zone there is pyrolytic reaction, it is thus achieved that semicoke and pyrolysis oil gas；
(2) described semicoke is supplied to reducing zone, and ferrous material is supplied to described semicoke by ferrous material entrance,
So that described ferrous material reacts with described semicoke, it is thus achieved that reduzate.
Method the most according to claim 7, it is characterised in that the particle diameter of described low-disintegration coal is 8-14mm；
Optionally, the particle diameter of described ferrous material is 6-10mm.
9. according to the method described in claim 7 or 8, it is characterised in that in described low-disintegration coal, fixed carbon content is not less than
37wt%,
Optionally, the grade of described ferrous material is not less than 35wt%.
Method the most according to claim 9, it is characterised in that fixed carbon and described chalybeate in described low-disintegration coal
In material, the mol ratio of ferrum element is 1:2～6.
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| CN106191363A (en) * | 2016-09-13 | 2016-12-07 | 江苏省冶金设计院有限公司 | The processing system of a kind of wet piece of lateritic nickel ore and method |
| CN106702152A (en) * | 2016-12-01 | 2017-05-24 | 神雾环保技术股份有限公司 | Quality-based gradient utilization system and method for medium-rank and low-rank coals |
| CN106755685A (en) * | 2016-12-01 | 2017-05-31 | 神雾环保技术股份有限公司 | The system and method for middle low-order coal sub-prime cascade utilization |
| CN107557512A (en) * | 2017-09-15 | 2018-01-09 | 重庆赛迪热工环保工程技术有限公司 | A kind of rotary hearth furnace joint production process |
| CN107557512B (en) * | 2017-09-15 | 2019-09-24 | 重庆赛迪热工环保工程技术有限公司 | A kind of rotary hearth furnace joint production process |
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