CN108178173A - The roasting system and method for a kind of aluminium hydroxide - Google Patents
The roasting system and method for a kind of aluminium hydroxide Download PDFInfo
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- CN108178173A CN108178173A CN201810007890.7A CN201810007890A CN108178173A CN 108178173 A CN108178173 A CN 108178173A CN 201810007890 A CN201810007890 A CN 201810007890A CN 108178173 A CN108178173 A CN 108178173A
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- flue gas
- roaster
- air
- aluminium hydroxide
- cyclone
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
Abstract
The invention discloses a kind of Aluminium hydroxide roasting system and methods.The system includes batcher, drier, preheater and roaster etc., further includes flue gas recirculation device and fuel vapour-liquid distribution device.Flue gas recycled pipe outlet is arranged on the gas connection pipeline between cooler and roaster.Fuel vapour-liquid distribution device includes fuel gas header and main burner, auxiliary burning nozzle.Roaster middle and upper part is additionally provided with overfire air jet and secondary air adjustor valve.Roaster roasting aluminium hydroxide mixes after generating heat smoke cooling, dedusting as flue gas recycled with hot-air, it burns to form the combustion air of high-temperature low-oxygen by auxiliary burning nozzle part, and by the grade separation ratio and fractional combustion mode of primary and secondary air, reduce nitrogen oxides initial concentration.The present invention significantly reduces main burning area temperature using low oxygen combustion pattern and fractional combustion tissue, it is suppressed that ensures that fuel combustion is complete while NO_x formation.
Description
Technical field
The present invention relates to the roasting systems and method of a kind of aluminium hydroxide, belong to metallurgical technology field.
Background technology
The roasting process of aluminium hydroxide is last procedure in aluminum oxide production process, is the production for determining aluminium oxide
Amount, quality and production process energy consumption and the important link of pollutant emission.Aluminium hydroxide roasting technology in China's is widely used at present
The gas suspension calcination technology of F.L.Smith.In gaseous pollutant control, natural gas or coal gas are with being preheating to 700-
1000 DEG C of air burnings generate high-temperature flue gas, and high-temperature flue gas heating aluminum hydroxide material makes it complete dehydration and part crystalline phase turn
The process of change, generates aluminium oxide, and aluminium oxide eventually becomes qualified alumina product by multistage cooling.Gas suspension calcination
Technology has the advantages such as production capacity height, start and stop convenience, good product quality.A however, main problem of gas suspension calcination technology
It is that discharged nitrous oxides are higher.The gas suspension calcination system discharged nitrous oxides of 3000 tons of aluminium oxide of a set of daily output are about 300-
400mg/m3.With the continuous raising environmental protection standard of country and place, reducing the discharge of aluminium oxide calcining process nitrogen oxides is
One major issue urgently to be resolved hurrily.
The main means for reducing discharged nitrous oxides in Aluminium hydroxide roasting technique at present are that the flue gas after burning is carried out
Denitration process, method include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR).Although however, SCR technology
Efficiency is higher, but requires using expensive catalyst, and catalyst can be inactivated gradually and need to regularly replace during use, significantly
Ground increases the cost of entire roasting technique.Although SNCR technology relative inexpensiveness, efficiency is low, and exclusive use can not meet
It is required that and SNCR technologies there are problems that more serious the escaping of ammonia, cause secondary pollution.SCR and SNCR is passive simultaneously
Treatment measures effectively can not fundamentally solve the problems, such as NO_x formation in roaster.Therefore, Aluminium hydroxide roasting mistake
The low nitrogen technology of journey still needs further to be broken through.
Invention content
The present invention is intended to provide a kind of Aluminium hydroxide roasting system and its operation method, by way of change burning tissue
What realization Aluminium hydroxide roasting process nitrogen oxides was initially generated largely reduces.
The invention is realized by the following technical scheme：
A kind of Aluminium hydroxide roasting system, including feed bin, batcher, drier, cyclone preheater, roaster, whirlwind point
From device, cooling cyclone, deduster and air-introduced machine, the cyclone preheater at least sets two-stage, the cooling cyclone setting
Several grades；Chopped-off head cyclone preheater entrance is connected with the batcher or drier, the exhanst gas outlet of chopped-off head cyclone preheater with
The deduster and air-introduced machine are sequentially connected equipped with smoke wind pipe；Final stage cyclone preheater and the roaster, cyclone separator,
There is material channel to be connected successively between several grades of cooling cyclones；Gas company is additionally provided between the cooling cyclone and roaster
It threads a pipe connected, it is characterised in that：The system also includes flue gas recirculation devices and fuel vapour-liquid distribution device；The flue gas is again
Circulator includes flue gas recycled pipeline and the flue gas recycled regulating valve being arranged on flue gas recycled pipeline and is arranged on
The flue gas recycled nozzle of flue gas recycled pipe outlet；The initiating terminal of the flue gas recycled pipeline is arranged on the dedusting
After device；The flue gas recycled pipe outlet is arranged on the gas connection pipeline between the cooler and roaster；
The fuel vapour-liquid distribution device includes fuel gas header and the burner being connect with fuel gas header, and the burner is included close to described
The main burner and the auxiliary burning nozzle close to flue gas recycled pipe outlet setting for roasting furnace bottom setting.
In above-mentioned technical proposal, drier especially venturi drier.
In above-mentioned technical proposal, the initiating terminal of the flue gas recycled pipeline is connected to after the air-introduced machine.
Or, the initiating terminal of the flue gas recycled pipeline is connected to the cigarette air hose between the deduster and the air-introduced machine
On road, the flue gas recirculation device further includes the recirculation blower being arranged on flue gas recycled pipeline.
As further improved technical solution, the flue gas recirculation device further includes inert gas source and heating fills
It puts, be provided with by-pass line on the flue gas recycled pipeline is connected with the inert gas source, and the by-pass line is close to institute
State the initiating terminal setting of flue gas recycled pipeline；The heating unit is arranged on the flue gas recycled pipeline.
In above-mentioned technical proposal, the inert gas source includes wherein one or more of source nitrogen, argon gas source.
As further improved technical solution, the roaster middle and upper part is additionally provided with overfire air jet and and Secondary Air
The secondary air adjustor valve that nozzle is connected, the secondary air adjustor valve are arranged on the outside of the roaster.
A kind of Aluminium hydroxide roasting method uses a kind of above-mentioned Aluminium hydroxide roasting system, the method includes：
Aluminium hydroxide material in feed bin is sent into drier and heat smoke combination drying by batcher；Or in feed bin
Aluminium hydroxide material is fed after entering drier and heat smoke combination drying by batcher again；
Dried aluminium hydroxide material is carry the cyclone preheater for sequentially entering at least two-stage setting by heat smoke,
Pre-heating temperature elevation in cyclone preheater；Aluminium hydroxide material after preheating enters roaster in the combustion-supporting lower roasting of combustion air；
Aluminium hydroxide forms high temperature alumina material after roaster roasting；Heat smoke carry high temperature alumina material into
Enter cyclone separator and carry out gas solid separation, the high temperature alumina material separated enters cooling cyclone, it is cold to be entered whirlwind
But it heated air while the air cooling of device；Air is after cooling cyclone is heated by high temperature alumina material, into rotation
The gas connection pipeline that forced air cooler is connect with roaster；
Heat smoke after cyclone separator detaches enters final stage cyclone preheater, and process from back to front is except chopped-off head rotation
After mulitistage cyclone other than wind preheater carries out preheating cooling to aluminium hydroxide material, hydroxide is dried into drier
Aluminium material, and continue preheating aluminium hydroxide material into chopped-off head cyclone preheater together in company with dried aluminium hydroxide material,
It leaves chopped-off head cyclone preheater heat smoke and has become flue gas less than 200 DEG C, flue gas passes through after subsequently entering deduster dedusting
Air-introduced machine takes out transmitting system；
Part of smoke after dedusting enters the flue gas recycled pipeline of flue gas recirculation device as flue gas recycled, leads to
After crossing flue gas recycled adjusting valve regulating flow, gas connection pipeline is sprayed by flue gas recycled nozzle, with being cooled down by whirlwind
The air mixing of device heating, then lights burning by a small amount of fuel gas that fuel gas header and auxiliary burning nozzle spray into, forms temperature
The combustion air for being 5%~15% for 800~1000 DEG C and oxygen concentration；Combustion air is mixed with the fuel gas sprayed into from main burner
Enter roaster from roasting furnace bottom to roast aluminium hydroxide material.
When the initiating terminal of flue gas recycled pipeline is connected on the smoke wind pipe between the deduster and the air-introduced machine
When, the part of smoke after dedusting is drawn into flue gas recycled pipeline by recirculation blower and is used as flue gas recycled.
When using inert gas source, above-mentioned Aluminium hydroxide roasting method includes：
Part of smoke after dedusting enters the flue gas recycled pipeline of flue gas recirculation device；
Inert gas delivers into flue gas recycled pipeline from inert gas source, is mixed with flue gas, adjusts inert gas ratio
Example is 100%~0%；Inert gas, as flue gas recycled, is heated, then by again with flue gas gaseous mixture by heating unit
Gas connection pipeline is sprayed by flue gas recycled nozzle after circulating flue gas adjusting valve regulating flow；
Flue gas recycled is mixed with by the air that cooling cyclone heats in gas connection pipeline, is then joined by fuel gas
A small amount of fuel gas that case and auxiliary burning nozzle spray into lights burning, and it with oxygen concentration is 5%~15% that form temperature, which be 800~1000 DEG C,
Combustion air；Combustion air, which is mixed with the fuel gas sprayed into from main burner from roasting furnace bottom, enters roaster to aluminium hydroxide
Material is roasted.
As further improved technical solution, the above method includes：
For air after cooling cyclone is heated by high temperature alumina material, a part passes through secondary air regulation valve regulation flow
Roaster middle and upper part is sprayed into as Secondary Air from overfire air jet afterwards；
Another part enters the gas connection pipeline that cooling cyclone is connect with roaster, with passing through flue gas recycled nozzle
The flue gas recycled mixing of penetrating, then lights burning by a small amount of fuel gas that fuel gas header and auxiliary burning nozzle spray into, is formed
The combustion air that temperature is 800~1000 DEG C and oxygen concentration is 5%~15%；Combustion air and the fuel gas sprayed into from main burner
Mixing enters roaster from roasting furnace bottom, and flameless combustion occurs；Burn generate heat smoke with from the second cyclone preheater into
The aluminium hydroxide material hybrid concurrency heat for entering roaster exchanges, and forms the state of gas suspending calcining；
Heat smoke carries thermal material to roaster upper flow, mixes, makes unburned with Secondary Air in roaster middle and upper part
The reaction was complete for most fuel gas.
The present invention has the following advantages and beneficial effects：1) flue gas recycled recycle and part burning form high temperature
The combustion air of hypoxemia while combustion stability is ensured, forms low oxygen combustion pattern, significantly reduces the temperature of combustion zone,
Inhibit the generation of nitrogen oxides；2) setting of roaster Secondary Air forms fractional combustion, and reproducibility ring is formed in main burning area
While border inhibits NO_x formation, ensure that fuel combustion is complete, and further dilute nitrogen oxides initial concentration.
Description of the drawings
Fig. 1 is a kind of roasting system schematic diagram of aluminium hydroxide according to the present invention.
Fig. 2 is a kind of roaster schematic diagram of aluminium hydroxide according to the present invention.
In figure：1- feed bins；2- batchers；3- driers；The first cyclone preheaters of 4-；The second cyclone preheaters of 5-；
6- cyclone separators；7- roasters；The first cooling cyclones of 8-；The second cooling cyclones of 9-；10- thirds whirlwind cools down
Device；The 4th cooling cyclones of 11-；12- fluidized bed coolers；13- fuel gas headers；The main burners of 14-；15- auxiliary is burnt
Mouth；16- flue gas recycled nozzles；17- dedusters；18- air-introduced machines；19- flue gas recycled regulating valves；20- reduced airs
Machine；21- chimneys；22- secondary air adjustor valves；23- overfire air jets；24- air intakes.
Specific embodiment
The specific embodiment and the course of work of the present invention are further described below in conjunction with the accompanying drawings.
The orientation such as upper, lower, left, right, front and rear in present specification term be based on position relationship shown in the drawings and
It establishes.Attached drawing is different, then corresponding position relationship is also possible to change therewith, therefore cannot be interpreted as with this to protecting model
The restriction enclosed.
One typical Aluminium hydroxide roasting system, frequently include feed bin 1, batcher 2, drier 3, cyclone preheater,
Roaster 7, cyclone separator 6, cooling cyclone, deduster 17 and air-introduced machine 18.Wherein cyclone preheater at least sets two-stage
And it is sequentially connected；Cooling cyclone setting is multistage and is sequentially connected.
As shown in Figure 1, a kind of Aluminium hydroxide roasting system of one of embodiment of the present invention, there is provided two-stage rotations
Wind preheater, respectively the first cyclone preheater 4 and the second cyclone preheater 5；There is provided Category Four cyclone cooler, difference simultaneously
For the first cooling cyclone 8, the second cooling cyclone 9,10 and the 4th cooling cyclone 11 of third cooling cyclone.This field one
As technical staff it is understood that cyclone preheater can also to be arranged to the three-level being sequentially connected, level Four even more multistage.
In the present embodiment, first cyclone preheater 4 is used as chopped-off head cyclone preheater, and the second cyclone preheater 5 is made
For final stage cyclone preheater.
According to material stroke, feed bin 1, batcher 2, drier 3, the first cyclone preheater 4, the second cyclone preheater 5, roasting
Burn stove 7, cyclone separator 6, the first cooling cyclone 8, the second cooling cyclone 9,10 and the 4th whirlwind of third cooling cyclone
It is connected successively with connecting pipe between cooler 11, fluidized bed cooler 12 is additionally provided with after the 4th cooling cyclone 11.It is dry
Dry 3 preferred venturi drier of device.Aluminium hydroxide material in feed bin 1 by batcher 2 be sent into drier 3 with about 300~
400 DEG C of heat smoke mixing, aluminium hydroxide material are evaporated by heat drying, the moisture of attachment.Dried aluminium hydroxide object
Material is then carried along into the first cyclone preheater 4 by thermal current.Alternatively, batcher 2 is arranged on after drier 3, aluminium hydroxide
The first cyclone preheater 4 is sent to by batcher 2 again after material is dry in drier 3.Aluminium hydroxide material passes sequentially through
First cyclone preheater 4 and the second cyclone preheater 5, are preheated to 350-450 DEG C, pass through the decline of the second cyclone preheater 5
Pipe enters roaster 7.The work of 1000-1200 DEG C of heat smoke that aluminium hydroxide material is generated in fuel gas burning in roaster 7
The crystallization water is lost under, and completes part crystal transition, forms aluminium oxide.Alumina material enters cyclonic separation from roaster 7
Device 6, solid alumina material is detached with heat smoke in cyclone separator 6.At this time the temperature of alumina material 1000 DEG C with
On.After alumina material leaves cyclone separator 6, revolved successively by the first cooling cyclone 8, the second cooling cyclone 9, third
10 and the 4th cooling cyclone 11 of forced air cooler, is cooled down in the process by cold air.Last alumina material passes through fluid bed
Cooler 12 is cooled further to less than 80 DEG C and discharge system, completes the production process of aluminium oxide.
Material and gas connecting pipe are equipped between cooling cyclone, while between the first cooling cyclone 8 and roaster 7
Gas connection pipeline is additionally provided with to be connected.In addition, cigarette wind channel is equipped between 6 and second cyclone preheater 5 of cyclone separator, and with
Material channel connection between first cyclone preheater 4 and the second cyclone preheater 5, the second cyclone preheater 5 and drier 3 it
Between be connected with cigarette wind channel, the first cyclone preheater 4 is connected with passing sequentially through cigarette wind channel between deduster 17, air-introduced machine 18,
There is smoke wind pipe to be connected between air-introduced machine 18 and chimney 21.
Heat smoke after the separation of cyclone separator 6, which enters the second cyclone preheater 5, carries out in advance aluminium hydroxide material
After heat drop temperature, into 3 Aluminium Hydroxide material of drier, and enter the first rotation together in company with dried aluminium hydroxide material
Wind preheater 4 continues to preheat aluminium hydroxide material, leaves 4 heat smoke of the first cyclone preheater and has become cigarette less than 200 DEG C
Gas, flue gas subsequently enter and take out transmitting system by air-introduced machine 18 after 17 dedusting of deduster.
Under the draft effect of air-introduced machine 18, air enters rotation from the air intake 24 being connected with the 4th cooling cyclone 11
Forced air cooler passes sequentially through the 4th cooling cyclone 11, third cooling cyclone 10, the second cooling cyclone 9 and the first whirlwind
Cooler 8, while alumina high temperature material of the cooling into cooling cyclone, the temperature of air is gradually heated to 700
~900 DEG C become hot-air.
Hot-air leaves the first cooling cyclone 8, the gas connection pipeline being connect into cooling cyclone with roaster 7.
System of the present invention further includes flue gas recirculation device and fuel vapour-liquid distribution device.Flue gas recirculation device includes
Flue gas recycled pipeline and the flue gas recycled regulating valve 19 being arranged on flue gas recycled pipeline and it is arranged on flue gas recycled
The flue gas recycled nozzle 16 of pipe outlet.The initiating terminal of flue gas recycled pipeline be connected to deduster 17 and air-introduced machine 18 it
Between smoke wind pipe on when, flue gas recirculation device further includes the recirculation blower 20 being arranged on flue gas recycled pipeline.Again
When the initiating terminal of circulating flue gas pipeline is connected to the after funnel 21 of air-introduced machine 18 before, recirculation blower 20 can not be set, then follow
The pressure head of ring flue gas utilization air-introduced machine 18 enters flue gas recycled pipeline.
Flue gas recycled pipe outlet is arranged on the gas connection pipeline between the first cooling cyclone 8 and roaster 7
On.Fuel vapour-liquid distribution device includes fuel gas header 13 and the burner being connect with fuel gas header 13, and burner is included close to roasting
The main burner 14 and the auxiliary burning nozzle 15 close to the setting of flue gas recycled pipe outlet of 7 bottom of stove setting.
Part of smoke after dedusting enters the flue gas recycled pipeline of flue gas recirculation device as flue gas recycled, leads to
It crosses after flue gas recycled regulating valve 19 adjusts flow, gas connection pipeline is sprayed by flue gas recycled nozzle 16, and by whirlwind
The air mixing of cooler heating, then lights burning by a small amount of fuel gas that fuel gas header 13 and auxiliary burning nozzle 15 spray into,
Form the combustion air that temperature is 800~1000 DEG C and oxygen concentration is 5%~15%；Combustion air with from main burner 14 spray into
Fuel gas mixing enters roaster 7 from 7 bottom of roaster and aluminium hydroxide material is roasted.
As further improved technical solution, 7 middle and upper part of roaster is additionally provided with overfire air jet 23 and and Secondary Air
The connected secondary air adjustor valve 22 of nozzle 23, secondary air adjustor valve 22 are arranged on 7 outside of roaster.
At this point, the hot-air for leaving the first cooling cyclone 8 is divided into two-way, 10%~30% hot-air passes through Secondary Air
Regulating valve 22 is sprayed into roaster 7 by overfire air jet 23 as Secondary Air.Remaining hot-air enters cooling cyclone and roasting
The gas connection pipeline that stove 7 connects mixes, so with 100~200 DEG C of the flue gas recycled come out from flue gas recycled nozzle 16
The a small amount of fuel gas (accounting for total fuel gas share 5%~10%) sprayed into afterwards by fuel gas header 13 and auxiliary burning nozzle 15 lights combustion
It burns, forms the combustion air that temperature is 800~1000 DEG C and oxygen concentration is 5%~15%.Combustion air from main burner 14 with spraying
The fuel gas mixing entered enters roaster 7 from 7 bottom of roaster, and flameless combustion, and total packet excess air system at this time occurs
Number is 0.9~1.0.The heat smoke generated that burns is mixed with entering the aluminium hydroxide material of roaster 7 from the second cyclone preheater 5
Concurrent heat exchanges, and forms the state of gas suspending calcining.Heat smoke carries thermal material to 7 upper flow of roaster, is roasting
It burns 7 middle and upper part of stove to mix with Secondary Air, total packet excess air coefficient reaches 1.1~1.3 at this time, makes uncombusted fuel solid/liquid/gas reactions
Completely.
Heat smoke after completely burned enters the progress material gas solid separation of P03 cyclone separators 6 after leaving roaster 7, with
Heat smoke enters the second cyclone preheater 5 for preheating aluminium hydroxide material afterwards, is admitted to 3 and first whirlwind of drier again later
Preheater 4 is used to drying and preheating aluminium hydroxide material.When leaving the first cyclone preheater 4 flue gas have cooled to 200 DEG C with
Under, subsequently enter deduster 17 and go out particulate matter, leave one wind of low-temperature flue gas of deduster 17 by after air-introduced machine 18 by cigarette
Chimney 21 is discharged, and another part sends flue gas recycled nozzle 16 back to as flue gas recycled, and the flow of flue gas recycled, which uses, to follow
Ring smoke regulating valve is controlled.So as to complete a cycle.
As further improved technical solution, flue gas recirculation device further includes inert gas source and heating unit.Again
By-pass line is provided on circulating flue gas pipeline with inert gas source to be connected, by-pass line is close to the starting of flue gas recycled pipeline
End setting；Heating unit is arranged on flue gas recycled pipeline.Inert gas source include source nitrogen, argon gas source one of them or
It is multiple.
At this point, the part of smoke after dedusting enters the flue gas recycled pipeline of flue gas recirculation device；
Inert gas delivers into flue gas recycled pipeline from inert gas source, is mixed with flue gas, adjusts inert gas ratio
Example is 100%~0%；Inert gas, as flue gas recycled, is heated, then by again with flue gas gaseous mixture by heating unit
Gas connection pipeline is sprayed by flue gas recycled nozzle 16 after the adjusting flow of circulating flue gas regulating valve 19；
Flue gas recycled is mixed with by the air that cooling cyclone heats in gas connection pipeline, is then joined by fuel gas
A small amount of fuel gas that case 13 and auxiliary burning nozzle 15 spray into lights burning, formed temperature be 800~1000 DEG C with oxygen concentration be 5%~
15% combustion air；Combustion air mixes that enter roaster 7 from 7 bottom of roaster right with the fuel gas sprayed into from main burner 14
Aluminium hydroxide material is roasted.
During using inert gas, the oxygen concentration in combustion air can be directly reduced, is reached in heating temperature and oxygen concentration
In the case of it is required that, the fuel gas sprayed into from auxiliary burning nozzle 15 can be close to 0.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of Aluminium hydroxide roasting system, including feed bin (1), batcher (2), drier (3), cyclone preheater, roaster
(7), cyclone separator (6), several grades of cooling cyclones, deduster (17) and air-introduced machine (18), the cyclone preheater is at least
Two-stage is set and is sequentially connected；The entrance of chopped-off head cyclone preheater is connected with the batcher or drier, the preheating of chopped-off head whirlwind
The exhanst gas outlet of device is sequentially connected with the deduster (17) and air-introduced machine (18) equipped with smoke wind pipe；Final stage cyclone preheater with
There is material channel to be connected successively between the roaster (7), cyclone separator (6), several grades of cooling cyclones；The whirlwind is cold
But gas connection pipeline is additionally provided between device and roaster (7) to be connected, it is characterised in that：The system also includes flue gas recirculations
Device and fuel vapour-liquid distribution device；The flue gas recirculation device includes flue gas recycled pipeline and is arranged on flue gas recycled pipe
Flue gas recycled regulating valve (19) on road and the flue gas recycled nozzle (16) for being arranged on flue gas recycled pipe outlet；Institute
The initiating terminal for stating flue gas recycled pipeline is arranged on after the deduster (17)；The flue gas recycled pipe outlet setting
On gas connection pipeline between the cooler and roaster (7)；The fuel vapour-liquid distribution device includes fuel gas header
(13) and with fuel gas header (13) burner connecting, the burner include the main burning close to the setting of the roaster (7) bottom
Mouth (14) and the auxiliary burning nozzle (15) close to flue gas recycled pipe outlet setting.
2. a kind of Aluminium hydroxide roasting system according to claim 1, it is characterised in that：The flue gas recycled pipeline
Initiating terminal is connected to after the air-introduced machine (18).
3. a kind of Aluminium hydroxide roasting system according to claim 1, it is characterised in that：The flue gas recycled pipeline
Initiating terminal is connected on the smoke wind pipe between the deduster (17) and the air-introduced machine (18), the flue gas recirculation device
Further include the recirculation blower (20) being arranged on flue gas recycled pipeline.
4. a kind of Aluminium hydroxide roasting system according to any one of claims 1 to 3, it is characterised in that：The flue gas is again
Circulator further includes inert gas source and heating unit, be provided on the flue gas recycled pipeline by-pass line with it is described lazy
Property gas source be connected, the by-pass line close to the flue gas recycled pipeline initiating terminal set；The heating unit setting
On the flue gas recycled pipeline.
5. a kind of Aluminium hydroxide roasting system according to claim 4, it is characterised in that：The inert gas source includes nitrogen
Wherein one or more of air source, argon gas source.
6. a kind of Aluminium hydroxide roasting system according to claim 1, it is characterised in that：Roaster (7) middle and upper part
It is additionally provided with overfire air jet (23) and the secondary air adjustor valve (22) being connected with overfire air jet (23), the secondary air regulation
Valve (22) is arranged on the outside of the roaster (7).
7. a kind of Aluminium hydroxide roasting method uses a kind of Aluminium hydroxide roasting system as described in claim 1, feature
It is：The method includes
Aluminium hydroxide material in feed bin (1) by batcher (2) is fed and passes through drier (3) and heat smoke combination drying；
Dried aluminium hydroxide material is carry the cyclone preheater for sequentially entering at least two-stage setting by heat smoke, in whirlwind
Pre-heating temperature elevation in preheater；Aluminium hydroxide material after preheating enters roaster (7) in the combustion-supporting lower roasting of combustion air；
Aluminium hydroxide forms high temperature alumina material after roaster (7) roasting；Heat smoke carry high temperature alumina material into
Enter cyclone separator (6) and carry out gas solid separation, the high temperature alumina material separated enters cooling cyclone, is entered whirlwind
Air is heated while the air cooling of cooler；Air enters after cooling cyclone is heated by high temperature alumina material
The gas connection pipeline that cooling cyclone is connect with roaster (7)；
Heat smoke after cyclone separator (6) separation enters final stage cyclone preheater, and process from back to front is except chopped-off head rotation
After mulitistage cyclone other than wind preheater carries out preheating cooling to aluminium hydroxide material, into drier (3) dry hydrogen
Alumina material, and continue preheating aluminium hydroxide object into chopped-off head cyclone preheater together in company with dried aluminium hydroxide material
Material, the heat smoke for leaving chopped-off head cyclone preheater have become flue gas less than 200 DEG C, and flue gas subsequently enters deduster (17) and removes
Transmitting system is taken out by air-introduced machine (18) after dirt；
Part of smoke after dedusting enters the flue gas recycled pipeline of flue gas recirculation device as flue gas recycled, by again
After circulating flue gas regulating valve (19) adjusts flow, gas connection pipeline is sprayed by flue gas recycled nozzle (16), and by whirlwind
The air mixing of cooler heating, then lights combustion by a small amount of fuel gas that fuel gas header (13) and auxiliary burning nozzle (15) spray into
It burns, forms the combustion air that temperature is 800~1000 DEG C and oxygen concentration is 5%~15%；Combustion air with from main burner (14)
The fuel gas mixing of penetrating enters roaster (7) from roaster (7) bottom and aluminium hydroxide material is roasted.
8. a kind of Aluminium hydroxide roasting method according to claim 7, it is characterised in that：When rising for flue gas recycled pipeline
When beginning is connected on the smoke wind pipe between the deduster (17) and the air-introduced machine (18), the part of smoke after dedusting
Flue gas recycled pipeline is drawn by recirculation blower (20) and is used as flue gas recycled.
9. a kind of Aluminium hydroxide roasting method according to claim 7, it is characterised in that：It further uses right such as will
The Aluminium hydroxide roasting system described in 4 is sought, the method includes
Part of smoke after dedusting enters the flue gas recycled pipeline of flue gas recirculation device；
Inert gas delivers into flue gas recycled pipeline from inert gas source, is mixed with flue gas, adjusts inert gas ratio and is
100%~0%；Inert gas, as flue gas recycled, is heated by heating unit with flue gas gaseous mixture, then passes through recycling
Gas connection pipeline is sprayed by flue gas recycled nozzle (16) after smoke regulating valve (19) adjusting flow；
Flue gas recycled is mixed with by the air that cooling cyclone heats in gas connection pipeline, then by fuel gas header
(13) and auxiliary burning nozzle (15) spray into a small amount of fuel gas light burning, formed temperature be 800~1000 DEG C with oxygen concentration be 5%
~15% combustion air；Combustion air, which is mixed with the fuel gas sprayed into from main burner (14) from roaster (7) bottom, enters roasting
Stove (7) is burnt to roast aluminium hydroxide material.
10. a kind of Aluminium hydroxide roasting method according to claim 7, it is characterised in that：It is further used such as right
It is required that the Aluminium hydroxide roasting system described in 6, the method includes
For air after cooling cyclone is heated by high temperature alumina material, a part adjusts flow by secondary air adjustor valve (22)
Roaster (7) middle and upper part is sprayed into as Secondary Air from overfire air jet (23) afterwards；
Another part enters the gas connection pipeline that cooling cyclone is connect with roaster (7), with passing through flue gas recycled nozzle
(16) the flue gas recycled mixing sprayed into, a small amount of fuel gas point then sprayed by fuel gas header (13) and auxiliary burning nozzle (15)
Combustion burning, forms the combustion air that temperature is 800~1000 DEG C and oxygen concentration is 5%~15%；Combustion air with from main burner
(14) the fuel gas mixing sprayed into enters roaster (7) from roaster (7) bottom, and flameless combustion occurs；Burn the hot cigarette generated
Gas is exchanged with the aluminium hydroxide material hybrid concurrency heat from the second cyclone preheater (5) into roaster (7), is formed gas and is hanged
The state of floating roasting；
Heat smoke carries thermal material to roaster (7) upper flow, mixes, makes not with Secondary Air in roaster (7) middle and upper part
The reaction was complete for the fuel gas of after-flame.
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