CN109432934A - A kind of gas cleaning integrated system and aluminium oxide calcining process system - Google Patents
A kind of gas cleaning integrated system and aluminium oxide calcining process system Download PDFInfo
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- CN109432934A CN109432934A CN201811648614.5A CN201811648614A CN109432934A CN 109432934 A CN109432934 A CN 109432934A CN 201811648614 A CN201811648614 A CN 201811648614A CN 109432934 A CN109432934 A CN 109432934A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
Abstract
The present invention discloses a kind of gas cleaning integrated system and aluminium oxide calcining process system, the flue gas integrated system includes at least gravitational dust collection unit, electric precipitation unit, bag-type dusting unit and denitration unit, the efficiency of dust collection of flue gas is up to 99.95% or more in this way, will to the maximum extent, efficiently carry out gas solid separation, so that nearly all aluminium hydroxide material is all converted to aluminium oxide in roasting main furnace, the waste of material is greatly reduced, and improves the quality of product.And the integrator is high-efficient to flue gas ash removal it is not necessary that revert system (can cancel revert system in the prior art) again is arranged in the subsequent process, greatly simplify system, and filtered outlet smoke dust discharge concentration substantially reduces, flue gas can be directly discharged to external environment, and denitration unit is set to the downstream of afterbody dust removing units, can contain NH while improving the quality of production to avoid what is sprayed into denitration3Substance aluminium hydroxide material is polluted.
Description
Technical field
The present invention relates to aluminium oxide calcining technical fields, and in particular to a kind of gas cleaning integrated system and aluminium oxide calcining
Process system.
Background technique
China is Chan Lv big country, aluminum smelting technology industry in Chinese national economy and social development in occupation of critical role, but
During aluminum smelting technology, especially aluminium oxide calcining process, flue dust and NOxDischarge intensity it is larger, in May, 2017, environmental protection
It is explicitly pointed out in " the executing the bulletin of the special emission limit of atmosphere pollution about Jing-jin-ji region and surrounding area " of portion's publication, Beijing-Tianjin
Multiple industries including coloured in Ji propagation in atmosphere channel city are newly-built and existing enterprise executes atmosphere pollution and especially arranges
Put limit value.Currently, country is in the smoke gas treatment for accelerating to start non-electrical domain after thermoelectricity minimum discharge, especially steel, coloured
Equal fields, and aluminum smelting technology industry is included within coloured industry.Therefore, it is necessary to be improved to aluminium oxide calcining technique, improve
While product quality, to flue dust, NOxEqual pollutants carry out efficient removal.
Existing process for making alumina generallys use gas suspension calcination technology, and the flue gas generated to the technique is handled
So that it meets discharge standard.
Summary of the invention
The object of the present invention is to provide a kind of gas cleaning integrated systems, including shell, along shell described in flow of flue gas direction
Internal portion successively includes gravitational dust collection unit, electric precipitation unit, bag-type dusting unit and denitration unit；
The gravitational dust collection unit its be internally provided with the weight for making that part solid particle is deposited by self gravity in flue gas
Field of force component；
The electric precipitation unit includes the electrod assembly for being used to form dedusting electric field；
The bag-type dusting unit is provided with filter bag；
The denitration unit includes catalyst storage area and the area Pen An, the area Pen An be located at the bag-type dusting unit and
Between the catalyst storage area, the nozzle of at least ammonia-gas spraying device is set to the area Pen An；
The gas cleaning integrated system further include be correspondingly arranged in the electric precipitation unit, the bag-type dusting unit and
Ash bucket is provided with below the gravitational dust collection unit.
It optionally, further include the dismembyator for being provided with inlet and outlet, the ash bucket includes the first ash bucket and the second ash bucket,
First ash bucket corresponds to the electric precipitation unit and the bag-type dusting unit, and second ash bucket corresponds to the gravitational dust collection
Unit, the import of the dismembyator are at least connected to the material outlet of second ash bucket, and the outlet of the dismembyator is for being connected to
Subsequent technique material input；The dismembyator is internally provided with grinding component, the material for flowing into second ash bucket
It is ground into predetermined particle.
Optionally, the enclosure interior is also integrated with auxiliary heat-exchanging pipe, for flowing out the pocket type to the enclosure interior
Flue gas before dust removing units and the entrance area Pen An is heated.
It optionally, further include controller and temperature-detecting device, the temperature-detecting device is described auxiliary for detecting inflow
It helps low after auxiliary heat-exchanging pipe heating inside the high-temperature medium temperature and the gas cleaning integrated system of heat exchanger tube
Warm flue-gas temperature；The controller controls the low-temperature flue gas according to the high-temperature medium temperature and the low-temperature flue gas temperature
Temperature is in predetermined denitration temperature range.
In addition, the present invention also provides a kind of aluminium oxide calcining process system, including flue gas described in any of the above embodiments is net
Change integrated system, the flue being set between connection aluminium oxide drying unit and aluminium oxide calcining device, the ash bucket
Discharge port is connected to the import of the aluminium oxide calcining device；The gas inlet of the gas cleaning integrated system is connected to the oxidation
The outlet of aluminium drying unit.
Optionally, the aluminium oxide calcining device includes cyclone preheater, main furnace and thermal release cyclone cylinder；In the shell
The integrated auxiliary heat-exchanging pipe in portion, for adding to the flue gas before flowing out the bag-type dusting unit and entering the area Pen An
Heat, the high-temperature flue gas import of the auxiliary heat-exchanging pipe, outlet are all connected to the outlet smoke pipe of the separation cyclone cylinder, to form height
Warm flue gas circuit, and it is provided with air-introduced machine on the high-temperature flue gas circuit, for providing the power of flow of flue gas.
Optionally, the exhanst gas outlet of the thermal release cyclone cylinder is connected to the import main line of the cyclone preheater；It is described
The gas vent of cyclone preheater is connected to the aluminium oxide drying unit, so as to by the object after aluminium oxide drying unit drying
Described in material is sent into.
It optionally, further include waste heat recycling heat-exchanging component and the cooling cyclone cylinder group for being connected to main furnace downstream, the cooling
Cyclone cylinder group includes at least two cooling cyclone cylinders, flows out the flue gas of the gas cleaning integrated system and flows into the cooling rotation
The cold air of air duct group recycles heat-exchanging component by the waste heat and carries out heat exchange.
Optionally, waste heat recycling heat-exchanging component include the first gas-water heat exchanger, the second gas-water heat exchanger and
Pumping member, the first gas-water heat exchanger, the second gas-water heat exchanger and the pumping member form water circulation
Circuit, the first gas-water heat exchanger are set to the exhanst gas outlet pipeline of the gas cleaning integrated system, second cigarette
Air-water heat exchanger is set to the inlet of cold air pipeline of the cooling cyclone cylinder group.
Optionally, the auxiliary heat-exchanging pipe includes shell side and tube side, and the shell side is bag-type dusting unit outflow
The runner of low-temperature flue gas, the tube side are the runner of high-temperature flue gas, and dust filtering component is provided in the tube side.
Using with gravitational dust collection unit, electric precipitation unit and bag in aluminium oxide calcining process system provided by the present invention
The gas cleaning integrated system of formula dust removing units is instead of one cyclonic preheater in the prior art, the gas cleaning integrated system
To the efficiency of dust collection of flue gas up to 90% or more, will to the maximum extent, efficiently carry out gas solid separation so that nearly all hydrogen-oxygen
Change aluminium material and be all converted to aluminium oxide in roasting main furnace, greatly reduces the waste of material, and improve the quality of product.And
And the integrator is high-efficient to flue gas ash removal (can cancel in the prior art it is not necessary that revert system again is arranged in the subsequent process
Revert system), greatly simplify system, and drop significantly through the filtered outlet smoke dust discharge concentration of gas cleaning integrated system
Low, flue gas can be directly discharged to external environment.
And denitration unit is set to the downstream of afterbody dust removing units, so on the one hand can be to avoid spraying into denitration
Contain NH3Substance aluminium hydroxide material is polluted, on the other hand avoid nasal mucus shape hydrogen sulfate ammonia from causing upstream device
Blocking, and then improve the quality of production, production efficiency and production security.
In addition, the mode of first dedusting denitration again is also it is possible to prevente effectively from particulate matter blocking, the generation of abrasive catalyst phenomenon,
Improve the service life of denitration efficiency and catalyst.
Detailed description of the invention
Fig. 1 is a kind of structure principle chart of aluminium oxide calcining process system in the prior art；
Fig. 2 is the structure principle chart of aluminium oxide calcining process system in a kind of specific embodiment of the present invention；
Fig. 3 is the structural schematic diagram of gas cleaning integrated system in a kind of specific embodiment of the present invention.
The reference numerals are as follows into Fig. 3 by Fig. 1:
One cyclonic preheater P01 ', second level cyclone preheater P02 ', cyclone preheater P02, thermal release cyclone cylinder P03,
Main furnace P04, aluminium hydroxide feed hopper L01, level-one measure Shen gram weighing belt F01, and second level measures Shen gram weighing belt F02, and feeding is defeated
Send machine A01, venturi drier A02, the cooling cyclone cylinder C01 of level-one, the cooling cyclone cylinder C02 of second level, the cooling cyclone cylinder of three-level
C03, the cooling cyclone cylinder C04 of level Four, aluminium oxide feed bin L02, secondary fluidizing fluid-bed blower K01, K02, electric precipitator P11, spiral shell
Revolve conveyer P12, air-introduced machine Y01, chimney P05, burner V01, controller D01, the first temperature sensor M01, second temperature
Sensor M02, the first gas-water heat exchanger T01, the second gas-water heat exchanger T02, pumping member B01, air-introduced machine Y02, cigarette
Gas purifying integral system EF, auxiliary heat-exchanging pipe EF1, catalyst storage area EF2, Pen An area EF3, ammonia-gas spraying device EF4, gravitational dust collection
Unit EF5, import loudspeaker EF6, the second ash bucket EF7, electric precipitation unit EF8, bag-type dusting unit EF9, dismembyator EF10.
Specific embodiment
Referring to FIG. 1, its process flow of gas suspension calcination technology in process for making alumina are as follows: aluminium hydroxide feed hopper
Wet hydrogen aluminium oxide in L01 containing Free water 10%~12% enters roaster system by venturi drier A02, by level-one
After cyclone preheater P01 ' and second level cyclone preheater P02 ' separation preheating, aluminium oxide completes preroast process, into master
Furnace P04 carries out suspension roasting, then separates using cyclone separator P03, and the aluminium oxide after separating successively passes through level-one
The cooling cyclone cylinder C02 of cooling cyclone cylinder C01, second level, the cooling cyclone cylinder C03 of three-level, the cooling cyclone cylinder C04 of level Four carry out primary cold
But, it further cools down using the fluidizing fluid-bed blower K01 of level-one, second level ebullated bed blower K02, is blown by aluminum oxide conveying system
It send to aluminium oxide feed bin L02.The exhaust gas come out from one cyclonic preheater P01 empties after electric precipitator P11, electric precipitation
The material (i.e. electric precipitator gray back) that device P11 is collected enters on strength helicoidal pump through screw below the bin conveyer P12
In the collection ash cellar of side, the high-pressure blast provided by roots blower blows electric precipitator P11 gray back to the cooling cyclone cylinder C02 of second level
Tapering Returning process, to adjust the igloss of finished product aluminium oxide.
Above-mentioned aluminum oxide gaseous state suspending calcining system generates following defect:
1, after aluminium hydroxide enters one cyclonic preheater P01 processing after venturi drier A02 drying, processed material
Concentration is bigger, and there are about 10% to 30% or so aluminium hydroxides to enter electric precipitator P11 through flue.At electric precipitator P11
After reason, material is pumped into the cooling cyclone cylinder C02 of second level through airlift.Finally, being mixed into alumina product, so that aluminium oxide
Contain excessively high aluminium hydroxide in finished product, reduces the quality of product.
2, the specific resistance of particulate matter is the important factor in order of electric precipitator dust removal performance, and due to aluminium oxide, hydroxide
The specific resistance of alumina particles is higher, and electric precipitator is relatively low to its arresting efficiency, the particulate matter for be easy to causeing electric precipitator to export
Concentration of emission is exceeded, and in the case where the decline of one cyclonic preheater separative efficiency, electric precipitator is exported granular material discharged dense
Degree often severely exceeds, and salic, the aluminum hydroxide particles object of its discharge are pollutant for atmosphere, for oxidation
It is raw material for aluminium production technology.Therefore this not only causes environmental pollution, also results in the waste of material.
3, there are alumina particles in aluminum electrolysis technology that solution rate is excessively slow even precipitates for existing aluminium oxide calcining technique
The phenomenon that, lead to the production efficiency and quality of electrolytic aluminium.
Therefore, how to overcome above-mentioned one or several technological deficiencies, be still those skilled in the art's skill urgently to be resolved
Art problem.
In order to make those skilled in the art more fully understand technical solution of the present invention, herein with the integrated system of gas cleaning
For system is applied in aluminium oxide calcining process system, and the present invention is made in the following with reference to the drawings and specific embodiments further
It is described in detail.Certainly, those skilled in that art should understand that the gas cleaning integrated system of this paper is not limited to aluminium oxide roasting
Firing technique system, can be applied to other need to flue gas carry out purified treatment process system, such as iron-smelting process system,
Process for making system etc..
The words such as " first " described herein, " second " are only the differentiations to function or the similar components of structure.
Fig. 2 and Fig. 3 are please referred to, Fig. 2 is that the structure of aluminium oxide calcining process system in a kind of specific embodiment of the present invention is former
Reason figure；Fig. 3 is the structural schematic diagram of gas cleaning integrated system in a kind of specific embodiment of the present invention.Wherein in the middle part of Fig. 2 and Fig. 1
Divide symbol identical, the identical a kind of device of expression function.
The present invention provides a kind of aluminium oxide calcining process system, and the present invention is aluminium oxide calcining technique system shown in Fig. 1
The system improved on the basis of system.Aluminium oxide calcining process system provided by the present invention include aluminium oxide drying unit,
Gas cleaning integrated system EF, aluminium oxide calcining device, waste heat recycle heat-exchanging component and even cooling cyclone cylinder group.
Wherein the channel of connection aluminium oxide drying unit and aluminium oxide calcining device is arranged in gas cleaning integrated system EF
On.Wherein aluminium oxide drying unit includes drier, and drier can be venturi drier A02, naturally it is also possible to be other
Drying part mainly realizes the drying to solid material.Aluminium oxide calcining device major function is to realize alumina material
Preheating and roasting, may include cyclone preheater, main furnace and thermal release cyclone cylinder.Certainly, the structure of aluminium oxide calcining device
It is not limited to above description.
In a specific embodiment, compared with Fig. 1 technical solution, process system of the invention is to utilize gas cleaning collection
It is dry in venturi by taking drier is venturi drier A02 as an example at system EF instead of the one cyclonic preheater in Fig. 1
Gas cleaning integrated system EF is set on the connecting pipeline of dry device A02 and second level cyclone preheater.
Specifically, gas cleaning integrated system EF may include shell, along aluminium oxide calcining flow of flue gas direction, shell
At least it is integrated with gravitational dust collection unit EF5, electric precipitation unit EF8 and bag-type dusting unit EF9 and denitration unit.Electric precipitation unit
EF8 includes the component that the electrod assembly for being used to form dedusting electric field, such as anode plate, cathode line etc. cooperatively form dedusting electric field,
The electrod assembly for forming dedusting electric field does not do specific introduction herein, can refer to the prior art.Bag-type dusting unit EF9 is provided with
Filter bag, the quantity and situation of filter bag can be selected by actual conditions, wherein the preferred metal filter bag of filter bag.Bag-type dusting unit
EF9 mainly utilizes part solid particle in sock filtration flue gas.
Enclosure interior is also integrated with gravitational dust collection unit EF5, and being internally provided with for gravitational dust collection unit EF5 roasts aluminium oxide
The gravitational field component that part solid particle is deposited by self gravity in flue gas is burnt, i.e. the function of gravitational dust collection unit EF5 is to make
Flue gas is precipitated by the gravity sedimentation of itself in larger particles in flue gas.The concrete form of gravitational field component, technology people in the art
Member can carry out Rational choice by specific environment.
Gravitational dust collection unit EF5 is located at the upstream of electric precipitation unit EF8.That is, flue gas first passes through gravitational dust collection list
First EF5 makes the material that particle is bigger in flue gas that flue gas be precipitated under the effect of gravity, then makes using dedusting electric field
Part median size particle deposition is precipitated in flue gas, finally using bag-type dusting unit EF9, utilizes sock filtration part granule
The solid particle of diameter.That is gravitational dust collection unit EF5 carries out pre- dedusting, and electric precipitation unit EF8 carries out moderate dedusting, and last pocket type removes
Dirt unit EF9 carries out depth dedusting.Material outlet of the solid particle filtered by gravitational dust collection unit EF5 from the second ash bucket EF7
It is transmitted to the import (cyclone preheater P02 import in Fig. 2) of aluminium oxide calcining device, by electric precipitation unit EF8 and bag-type dusting
The solid particle of unit EF9 filtering is sent to the import of cyclone preheater from the first ash bucket, enters after being separated by cyclone preheater
Main furnace P04.
By above-mentioned setting, gas cleaning integrated system EF, up to 99.95% or more, exports flue dust to flue gas ash removal efficiency
Concentration of emission is less than 10mg/m3。
Gas cleaning integrated system EF further includes ash bucket, and the discharge port of ash bucket passes through pipeline connection aluminium oxide calcining device
Import.Ash bucket can be one outlet, or multiple.
In a specific embodiment, ash bucket may include the first ash bucket and the second ash bucket, and the first ash bucket is correspondingly arranged
Below electric precipitation unit EF8 and bag-type dusting unit EF9, the discharge port of the first ash bucket is filled by pipeline connection aluminium oxide calcining
The import set, in Fig. 2, the discharge port of the first ash bucket is connected to cyclone preheater.First ash bucket can only have a discharge port, when
Two or more discharge ports so also can be set, such as a discharge port is arranged in corresponding electric precipitation unit EF8, corresponding pocket type removes
A discharge port is arranged in dirt unit EF9.Certainly, set-up mode is not limited to be described herein, as long as can be realized above-mentioned function i.e.
It can.
The exhanst gas outlet of gas cleaning integrated system EF passes through fume extractor outside piping connection, usually external fume extractor
For chimney.Certainly, flue gas can also be immediately discharged to outside from the exhanst gas outlet of gas cleaning integrated system EF.
In this way, material is directly entered gas cleaning after venturi drier A02 is dry in aluminium hydroxide feed hopper L01
Integrated system EF successively passes through gravitational dust collection unit EF5, electric precipitation unit EF8 and bag inside gas cleaning integrated system EF
Formula dust removing units EF9, the partial particulate in flue gas are isolated by filtration out, are delivered to cyclone preheater from the discharge port of ash bucket, are passed through
The alumina particle that cyclone preheater is separated enters main furnace P04 suspension roasting, then enters back into subsequent process flow.It is another
Aspect, the flue gas flowed out from the exhanst gas outlet of gas cleaning integrated system EF can be arranged directly or after waste heat recycles by outside
The discharge of cigarette equipment.
From the above, it can be seen that using with gravitational dust collection in aluminium oxide calcining process system provided by the present invention
Unit EF5, electric precipitation unit EF8, bag-type dusting unit EF9 and denitration unit gas cleaning integrated system EF instead of existing
One cyclonic preheater in technology, the gas cleaning integrated system EF to the efficiency of dust collection of flue gas up to 90% or more, will be maximum
Limit, efficiently carry out gas solid separation so that nearly all aluminium hydroxide material is all converted to aluminium oxide in roasting main furnace,
The waste of material is greatly reduced, and improves the quality of product.And the integrator is high-efficient to flue gas ash removal without rear
Revert system (can cancel revert system in the prior art) again is set in continuous technique, greatly simplifies system, and through cigarette
The filtered outlet smoke dust discharge concentration of gas purifying integral system EF substantially reduces, and flue gas can be directly discharged to external environment.
In view of NO in flue gasxInfluence to external environment, the flue gas after depth dedusting can be de- with further progress
Nitre technique.I.e. enclosure interior can also be integrated with out of stock unit, be located at the downstream bag-type dusting unit EF9, and denitration unit includes urging
Agent storage area EF2 and Pen An area EF3, the area Pen An EF3 are located between bag-type dusting unit EF9 and catalyst storage area EF2, until
The nozzle of few ammonia-gas spraying device EF4 is set to the area Pen An EF3.That is ammonia-gas spraying device EF4 can be set in the area Pen An EF3,
It can be set outside the area Pen An EF3.Preferably ammonia-gas spraying device EF4 is set to outside the area Pen An EF3 herein, i.e., positioned at shell
Outside, reduction occupy enclosure interior space.
For storing denitrating catalyst, the flue gas after depth dedusting is sprayed catalyst storage area EF2 in the area Pen An EF3
Ammonia carries out denitration when the flue gas after spraying ammonia flows through catalyst storage area EF2 under the catalytic action of catalyst.Catalyst can be with
For vanadium tungsten titanium cellular catalyst.
In above embodiment, denitration unit is set to the downstream of afterbody dust removing units, it so on the one hand can be with
Avoid spraying into denitration contains NH3Substance aluminium hydroxide material is polluted, on the other hand avoid nasal mucus shape hydrogen sulfate ammonia
It results in blockage to upstream device, and then improves the quality of production, production efficiency and production security.
In addition, the mode of first dedusting denitration again is also it is possible to prevente effectively from particulate matter blocking, the generation of abrasive catalyst phenomenon,
Improve the service life of denitration efficiency and catalyst.
Certainly, the import of gas cleaning integrated system EF can be import loudspeaker EF6, in order to which flue gas is removed even into electricity
Dirt unit EF8.
In order to further increase the efficiency of dust collection of gas cleaning integrated system EF, also further setting is as follows herein.
The usual partial size of solid particle filtered by gravitational dust collection unit EF5 is bigger, and subsequent dissolution speed is slow, very
The phenomenon that precipitating can extremely be generated.Against the above technical problems, the present invention has carried out following improvement to system.
In the various embodiments described above, aluminium oxide calcining process system can also include dismembyator EF10, and dismembyator EF10 includes
Inlet and outlet, the material outlet of the second ash bucket of inlet communication EF7 of dismembyator EF10, the outlet whirlwind of dismembyator EF10
The import of preheater, dismembyator EF10 are internally provided with grinding component, and the material for flowing into the first ash bucket is ground into predetermined
Particle.Predetermined particle refers to the suitable grain that not will cause that solution rate is slow or precipitates in electrolyte in subsequent oxidation alumina particles
Diameter.Certainly, predetermined particle is the smaller the better.Underground predetermined particle specific size, can't understand those skilled in that art
This paper technical solution causes obstacle, will not interfere its implementation.
The specific structure of dismembyator EF10 can refer to the prior art, be not belonging to introduce herein.
Denitrating technique has certain requirement, the denitrating flue gas efficiency of usual 300 degrees centigrade for the temperature of flue gas
It is relatively high.Therefore in order to improve denitration efficiency as far as possible, following improvement has also been carried out to system herein.
In a specific embodiment, above-mentioned process system can also include auxiliary heat-exchanging pipe EF1, be integrated in shell
Pair inside is mainly used for the flue gas before convection current goes out pocket type dust removing units EF9 and do not enter the area Pen An EF3 also and is heated, i.e.,
Flue gas before the area Pen An EF3 is preheated.The high temperature heat source of auxiliary heat-exchanging pipe EF1 can be electricity, can be from outside
High temperature fluid medium.By taking aluminium oxide calcining technique as an example, import, the outlet of auxiliary heat-exchanging pipe can be all connected to aluminium oxide calcining
The outlet smoke pipe of main furnace in device, to form high-temperature flue gas circuit.Air-introduced machine Y02, air-introduced machine are provided on high-temperature flue gas circuit
Y02 leads to the main furnace P04 partial fume exported inside auxiliary heat-exchanging pipe, and high-temperature flue gas returns again to main furnace after auxiliary heat-exchanging pipe
P04 exports smoke pipe.
The flue-gas temperature of the main outlet furnace P04 is up to 1000 degrees Celsius, under the action of air-introduced machine Y02, the main outlet furnace P04
Part high-temperature flue gas is directed to inside auxiliary heat-exchanging pipe, and the low-temperature flue gas through bag-type dusting unit EF9 flows through auxiliary and changes in shell
After heat pipe, by the high-temperature flue gas heat temperature raising inside auxiliary heat-exchanging pipe, the area Pen An EF3 is then flowed into.It in this way can will be in shell
The denitration flue gas in portion is controlled in best denitration temperature range, to greatly improve denitration efficiency.
Power by controlling air-introduced machine Y02 may be implemented to flow into the flow of auxiliary heat-exchanging pipe EF1 high temperature flue gas, in turn
The temperature of low-temperature flue gas after control heat exchange.
Specifically, the exhanst gas outlet of main furnace P04 is connected to thermal release cyclone cylinder P03, import, the outlet of auxiliary heat-exchanging pipe EF1
It is connected to main line between main furnace and thermal release cyclone cylinder P03.
In the various embodiments described above, the import supervisor of the exhanst gas outlet connection cyclone preheater P02 of thermal release cyclone cylinder P03
Road, so that the high-temperature flue gas can be preheated to the solid particle before entering cyclone preheater P02.
Meanwhile the gas vent connection aluminium oxide drying unit (gas of cyclone preheater in Fig. 2 of cyclone preheater P02
Outlet venturi drier A02), so that the material after the drying of aluminium oxide drying unit is sent into subsequent technique program, example
It is such as sent into inside gas cleaning integrated system EF.
Denitration discharge flue gas temperature be also it is relatively high, in order to reduce thermal loss as far as possible, can also carry out herein
It is arranged below.
As described above, the aluminium oxide calcining process system in the various embodiments described above further includes waste heat recycling heat-exchanging component and company
It is connected to the cooling cyclone cylinder group in main furnace downstream, cooling cyclone cylinder group includes at least two cooling cyclone cylinders, shows cooling in Fig. 2
Cyclone cylinder group includes the specific embodiment of four cooling cyclone cylinders, and along flow direction of material, four cooling cyclone cylinders are respectively as follows: level-one
The cooling cyclone cylinder C02 of cooling cyclone cylinder C01, second level, the cooling cyclone cylinder C03 of three-level, the cooling cyclone cylinder C04 of level Four.
Suspension roasting is carried out into main furnace P04, is then separated using cyclone separator P03, the oxidation after separating
Aluminium successively passes through the cooling cyclone cylinder C01 of level-one, the cooling cyclone cylinder C02 of second level, the cooling cyclone cylinder C03 of three-level, the cooling whirlwind of level Four
Cylinder C04 carries out primary cooling, further cools down using the fluidizing fluid-bed blower K01 of level-one, second level ebullated bed blower K02, by
Aluminum oxide conveying system is blowed to aluminium oxide feed bin L02.
The cold air of flue gas and the cooling cyclone cylinder group of inflow that gas cleaning integrated system EF is flowed out in the present invention passes through remaining
Recuperation of heat heat-exchanging component carries out heat exchange, to flow into cooling cyclone cylinder group using the flue gas of gas cleaning integrated system EF
Cold air.For the above, flows out the flue gas of gas cleaning integrated system EF and flow into the cold of the cooling cyclone cylinder C04 of level Four
Air carries out heat exchange by pre- recuperation of heat heat-exchanging component.
In a specific embodiment, waste heat recycling heat-exchanging component may include the first gas-water heat exchanger T01, second
Gas-water heat exchanger T02 and pumping member B01, the first gas-water heat exchanger T01, the second gas-water heat exchanger T02 and pumping
Part B 01 forms water-flow circuit, and the first gas-water heat exchanger T01 is set to the exhanst gas outlet of gas cleaning integrated system EF
Pipeline, the second gas-water heat exchanger T02 are set to the inlet of cold air pipeline of cooling cyclone cylinder group.
The above-mentioned form for setting waste heat recycling heat-exchanging component on two gas-water heat exchangers, can be improved system setting
Flexibility.
In order to realize the automation control of system, the present invention is further provided with controller D01 and temperature-detecting device,
Temperature-detecting device is used to detect inside the high-temperature medium temperature for flowing into auxiliary heat-exchanging pipe and gas cleaning integrated system through auxiliary
Low-temperature flue gas temperature after helping heat exchanger tube to heat；Controller controls low temperature cigarette according to high-temperature medium temperature and low-temperature flue gas temperature
Temperature degree is in predetermined denitration temperature range.
By taking aluminium oxide calcining technique as an example, temperature-detecting device is for detecting the high temperature cigarette for flowing to auxiliary heat-exchanging pipe by main furnace
Low-temperature flue gas temperature inside temperature degree and gas cleaning integrated system EF after the heating of auxiliary heat-exchanging pipe.Specifically, temperature
Detection device may include the first temperature sensor M01 and second temperature sensor M02, be respectively used to detection high-temperature flue-gas
With low-temperature flue gas temperature.
Controller D01 controls the work of air-introduced machine Y02 and pumping member B01 according to high-temperature flue-gas and low-temperature flue gas temperature
Make efficiency, so that low-temperature flue gas temperature is in predetermined denitration temperature range.
Aluminium oxide calcining process system provided by the present invention can also include that level-one measures Shen gram weighing belt F01, second level
Shen gram weighing belt F02, feeding conveyer A01 are measured, above each component is sequentially connected to aluminium hydroxide feed hopper L01 and drier
Between A02.Similarly for main furnace P04 equipped with burner V01, the effect of above each component in systems is same as the prior art,
This is not repeated them here.
Furthermore main induced draft fan Y01 can also be set on the flue collector between gas cleaning integrated system and chimney P05,
For providing power of discharging fume.
The above is only the preferred embodiment of the present invention, it is noted that those skilled in the art are come
It says, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of gas cleaning integrated system, which is characterized in that including shell, successively along enclosure interior described in flow of flue gas direction
Including gravitational dust collection unit, electric precipitation unit, bag-type dusting unit and denitration unit；
The gravitational dust collection unit its be internally provided with the gravitational field for making that part solid particle is deposited by self gravity in flue gas
Component；
The electric precipitation unit includes the electrod assembly for being used to form dedusting electric field；
The bag-type dusting unit is provided with filter bag；
The denitration unit includes catalyst storage area and the area Pen An, and the area Pen An is located at the bag-type dusting unit and described
Between catalyst storage area, the nozzle of at least ammonia-gas spraying device is set to the area Pen An；
The gas cleaning integrated system further includes being correspondingly arranged in the electric precipitation unit, the bag-type dusting unit and described
Ash bucket is provided with below gravitational dust collection unit.
2. gas cleaning integrated system according to claim 1, which is characterized in that further include being provided with grinding for inlet and outlet
Grinder, the ash bucket include the first ash bucket and the second ash bucket, and first ash bucket corresponds to the electric precipitation unit and the pocket type
Dust removing units, second ash bucket correspond to the gravitational dust collection unit, and the import of the dismembyator is at least connected to second ash
The material outlet of bucket, the outlet of the dismembyator is for being connected to subsequent technique material input；The dismembyator is internally provided with
Grinding component, the material for flowing into second ash bucket are ground into predetermined particle.
3. gas cleaning integrated system according to claim 1 or claim 2, which is characterized in that the enclosure interior is also integrated with auxiliary
Heat exchanger tube is helped, is carried out for the flue gas before flowing out the bag-type dusting unit to the enclosure interior and enter the area Pen An
Heating.
4. gas cleaning integrated system according to claim 3, which is characterized in that further include controller and temperature detection dress
It sets, the temperature-detecting device is for detecting the high-temperature medium temperature and the gas cleaning for flowing into the auxiliary heat-exchanging pipe
Low-temperature flue gas temperature inside integrated system after auxiliary heat-exchanging pipe heating；The controller, according to the high-temperature medium
Temperature and the low-temperature flue gas temperature control the low-temperature flue gas temperature and are in predetermined denitration temperature range.
5. a kind of aluminium oxide calcining process system, which is characterized in that including the described in any item gas cleanings of Claims 1-4
Integrated system, the flue being set between connection aluminium oxide drying unit and aluminium oxide calcining device, the ash bucket go out
Material mouth is connected to the import of the aluminium oxide calcining device；The gas inlet of the gas cleaning integrated system is connected to the aluminium oxide
The outlet of drying unit.
6. aluminium oxide calcining process system according to claim 5, which is characterized in that the aluminium oxide calcining device includes rotation
Wind preheater, main furnace and thermal release cyclone cylinder；The integrated auxiliary heat-exchanging pipe of the enclosure interior, for being removed to the outflow pocket type
Flue gas before dirt unit and the entrance area Pen An is heated, and the high-temperature flue gas import of the auxiliary heat-exchanging pipe, outlet are equal
It is connected to the outlet smoke pipe of the separation cyclone cylinder, to form high-temperature flue gas circuit, and is arranged on the high-temperature flue gas circuit
There is air-introduced machine, for providing the power of flow of flue gas.
7. aluminium oxide calcining process system according to claim 6, which is characterized in that the flue gas of the thermal release cyclone cylinder goes out
Mouth is connected to the import main line of the cyclone preheater；The gas vent of the cyclone preheater is connected to the aluminium oxide drying dress
It sets, described in being sent into the material after aluminium oxide drying unit drying.
8. according to any one of claim 5 to the 7 aluminium oxide calcining process system, which is characterized in that further include waste heat recycling
Heat-exchanging component and the cooling cyclone cylinder group for being connected to main furnace downstream, the cooling cyclone cylinder group include at least two cooling whirlwind
Cylinder, the flue gas for flowing out the gas cleaning integrated system and the cold air for flowing into the cooling cyclone cylinder group are returned by the waste heat
It receives heat-exchanging component and carries out heat exchange.
9. aluminium oxide calcining process system according to claim 8, which is characterized in that the waste heat recycles heat-exchanging component and includes
First gas-water heat exchanger, the second gas-water heat exchanger and pumping member, the first gas-water heat exchanger, described second
Gas-water heat exchanger and the pumping member form water-flow circuit, and the first gas-water heat exchanger is set to the flue gas
The exhanst gas outlet pipeline of purifying integral system, the second gas-water heat exchanger are set to the cold sky of the cooling cyclone cylinder group
Gas inlet pipe road.
10. aluminium oxide calcining process system according to claim 6, which is characterized in that the auxiliary heat-exchanging pipe includes shell side
And tube side, the shell side are the runner of the low-temperature flue gas of bag-type dusting unit outflow, the tube side is the stream of high-temperature flue gas
Road, and dust filtering component is provided in the tube side.
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| CN201811648614.5A CN109432934A (en) | 2018-12-30 | 2018-12-30 | A kind of gas cleaning integrated system and aluminium oxide calcining process system |
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| CN201811648614.5A CN109432934A (en) | 2018-12-30 | 2018-12-30 | A kind of gas cleaning integrated system and aluminium oxide calcining process system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111170764A (en) * | 2019-12-31 | 2020-05-19 | 娄底市安地亚斯电子陶瓷有限公司 | Wet hydrogen system and working method thereof |
| CN115155302A (en) * | 2022-06-20 | 2022-10-11 | 成都易态科技有限公司 | Treatment system and treatment method for furnace gas of fuming furnace |
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