CN107217151A - A kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit and its pretreating process - Google Patents
A kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit and its pretreating process Download PDFInfo
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- CN107217151A CN107217151A CN201710638424.4A CN201710638424A CN107217151A CN 107217151 A CN107217151 A CN 107217151A CN 201710638424 A CN201710638424 A CN 201710638424A CN 107217151 A CN107217151 A CN 107217151A
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- dust
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/18—Cleaning-out devices
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
Abstract
The invention discloses a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit and its pretreating process, belong to rotary hearth furnace zinc powder recycling technical field.The present invention is including at least two by subtracting the rotary hearth furnace flue gas cool-down device for reducing dust of cloud of dust gas delivery line serial communication；The dust arrester installation that cloud of dust gas delivery line is connected is subtracted by final stage with the rotary hearth furnace flue gas cool-down device for reducing dust of end；The flue gas cool-down mechanism is in the barrel-like structure of closing, and the zinc-containing dust flue gas ingress pipe at the top of barrel-like structure with communicating, and barrel-like structure inwall is fixed with downwardly extending dust board；It is described to subtract the upper side that cloud of dust gas delivery line is fixed on barrel-like structure；The bottom of the barrel-like structure is communicated in closing in shape, and depositing dust dust leg.The present invention is relatively isolated to flue gas cool-down by least two-stage forced cooling mechanism and air guide mechanism, and by natural gravity and inertial dust collection, has reached recovery crude zinc powder, and flue gas cool-down to less than 150 DEG C, and ensures the stable purpose of whole recovery process system.
Description
Technical field
The present invention relates to rotary hearth furnace zinc powder recycling technical field, more particularly to a kind of rotary hearth furnace zinc powder off-gas recovery are pre-
Processing unit and its pretreating process.
Background technology
The sludge Dust Capacity produced in steel production is the 10% of output of steel, and the dezincification of rotary hearth furnace metallized pellet is produced
Line, is mainly used in the metallurgical sludge dust of direct-reduction processing steel plant, its production process with elements such as Zn, K in recovered flue gas,
Because the particularity of the elements such as Zn, K causes recovery process complexity, existing rotary hearth furnace metallized pellet dezincification apparatus for production line
Configure perfect not to the utmost, operating rate not high and big to the main technogenic influence of production process.
Because dezincification temperature is higher, zinc containing gaseous state, liquid Zn in flue gas generally in temperature-fall period is reclaimed, are bonded in and changed
Heat exchanger is caused to block in hot device, it is necessary to which frequently cleaning is overhauled, and the high flue gas fluctuation of temperature is easy to the last recovery of scaling loss
Cloth bag.
Simultaneously in order to ensure that flue gas enters existing general bag-type dust collector, it is required for design and installation to convert cold blast sliding valve reduction
Flue-gas temperature, not only increases the treating capacity of gas cleaning, because blast is increased, is also easy to the fluctuation for causing to produce main technique,
The energy consumption of main air blower is also increased simultaneously.
Bag-type dust retracting device can realize 50mg/m3Discharge below, but the characteristic requirements flue-gas temperature of cloth bag is stable
Less than 150 DEG C of holding, it is most preferable below 100 DEG C.Therefore the requirement of the cooling pretreatment of the zinc-containing dust flue gas of dezincification technique,
Increasingly highlight.
Through retrieval, Chinese patent application, publication number：CN104004879B, publication date：2016.08.10, one kind is disclosed
Flue gas low-temperature section waste heat recovery apparatus of converter, including adiabatic flue, adiabatic flue one end is connected to converter gasification cooling cigarette
Road, the other end one section of evaporator of connection, one section of connection atomization cooling Venturi tube of evaporator, atomization cooling Venturi tube connection evaporator
Two sections, two sections of connection economizers of evaporator, economizer connection inertia force dust arrester；Hot water in economizer enters evaporator one
After two sections of section and evaporator, saturated steam is produced by its internal flue gas with heat；Set in atomization cooling Venturi tube
There are double medium spray guns.The invention further relates to the exhaust heat recovering method of flue gas low-temperature section waste heat recovery apparatus of converter.Flue gas with
The atomized drop that double medium spray guns inside the atomization cooling Venturi tube spray is exchanged heat, and the flue-gas temperature after heat exchange is in
In the range of 580 DEG C -600 DEG C, so as to effectively contain the localized clusters of carbon monoxide in flue gas, it is to avoid occur to dodge quick-fried danger
Danger so that the equipment uses safer.But profit of the invention by one section of evaporator, two sections of evaporator to strengthen fume afterheat
With, and diameter processing is carried out to flue dust with spray gun and can not be recycled, that is, water source is wasted, new pollution sources are generated again.
The content of the invention
1. the invention technical problem to be solved
For the processing efficiency of dust collection of zinc-containing dust flue gas in rotary hearth furnace metallized pellet dezincification production line in the prior art
Low, cooling-down effect is not obvious, installation converts cold blast sliding valve and easily causes the problem of whole dezincification production-line technique is fluctuated, and the present invention is provided
A kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit and its pretreating process.It by least two-stage forced cooling mechanism and
Air guide mechanism is relatively isolated to flue gas cool-down, and by natural gravity and inertial dust collection, has reached recovery crude zinc powder, and cigarette
Gas cools to less than 150 DEG C, and ensures the stable purpose of whole recovery process system.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit, including：At least two is by subtracting cloud of dust gas delivery line series connection company
Logical rotary hearth furnace flue gas cool-down device for reducing dust；Cloud of dust gas is subtracted by final stage with the rotary hearth furnace flue gas cool-down device for reducing dust of end
The dust arrester installation of delivery line connection, is used after zincilate micronic dust is reclaimed；Wherein：The rotary hearth furnace flue gas cool-down depositing dust dress
Put including：Air conducting mechanism, for cooling to whole device；In the inside of the air conducting mechanism, and and air
Deflector is in the flue gas cool-down mechanism of cavity loop nested structure, and bulky grain zincilate flue dust is due to temperature reduction, and density becomes big,
Drop in the bottom of flue gas cool-down mechanism, reach the effect for subtracting dirt step by step；The flue gas cool-down mechanism is external to pass air conducting
The zinc-containing dust flue gas ingress pipe of mechanism and subtract cloud of dust gas delivery line；The flue gas cool-down mechanism is kept away in the barrel-like structure of closing
Exempt from outer gas stream and produce fluctuation, the top phase of the zinc-containing dust flue gas ingress pipe and barrel-like structure in whole technique to flue gas
Logical, barrel-like structure inwall is fixed with downwardly extending dust board, allows bulky grain zincilate flue dust because inertia and gravity are hit in dust board
On, and there is time enough to cool and fall；It is described to subtract the upper side that cloud of dust gas delivery line is fixed on barrel-like structure, subtract after dirt
Flue gas exported by the pipeline；The bottom of the barrel-like structure is communicated in closing in shape, and depositing dust dust leg, is easy to bulky grain to contain
Secondary utilization after the centralized collection and concentration ash discharge of zinc powder flue dust.
Further technical scheme, dust board is the upward arc plate of nock, and the bulky grain zincilate flue dust of edges of boards is first collected
In in flue gas cool-down actuator base is fallen to behind arc bottom again；Effect also is that the relative area of cambered surface is more than flat board, bulky grain
Flue dust drop during due to random motion, and arc plate can stop the bulky grain of arbitrary motion, and dirt effect is subtracted so as to improve
Really.
Heat exchange dress is fixedly installed inside further technical scheme, the headspace delivery line of the air conducting mechanism
Put, the heat that air conducting mechanism is exchanged heat is absorbed by heat-exchanger rig, reach the effect of heat recovery and utilization；The dust board
The top of flue gas cool-down mechanism is fixed in the top fixing end away from the swash plate shape for subtracting cloud of dust gas delivery line, first swash plate,
And by the import of zinc-containing dust flue gas ingress pipe and subtract the outlet of cloud of dust gas delivery line and separate, dust board hinders the bulky grain of flowing
After gear, dropped due to the effect of inertia, and the air velocity of flue gas is gradually reduced, extension flue gas is in whole flue gas cool-down machine
Flowing time in structure, further allows bulky grain zincilate flue dust to have time enough to cool and fall.
Further technical scheme, air conducting mechanism is in the drum structure that top is gradually closed up, and is easy to the heat after heat exchange
Air is concentrated and secondary heat exchange utilization is carried out after outflow, and diameter is more than the flue gas cool-down mechanism, the shape around flue gas cool-down mechanism
Into ring cavity；In the ring cavity of the cavity loop nested structure, stationary distribution has air conducting reinforcing mechanisms, improves air velocity,
And heat exchange efficiency is improved, ring cavity bottom is air intake.
Further technical scheme, air conducting reinforcing mechanisms are the diaphragm that homogeneous vertical formula is fixed, and are both improved
The convection velocity that air rises, can play the purpose of direct heat conduction again, and the in-house heat conduction of flue gas cool-down is exported, carried
The in-house cooling rate of high flue gas cool-down.
Further technical scheme, diaphragm is distributed as the radian setting every 20~40 °, when being distributed overstocked, influence
Air quantity enters, and heat exchange when being distributed thin, influences wind speed using few；The oblique angle of the dust board is 70~80 °, is not had
The effect of inertial impaction, during angle too small, easily accumulation is not easy to drop particle in plate face.
Further technical scheme, the top of flue gas cool-down mechanism is provided with and is fixed on the strong of air conducting mechanism side wall
Cooling mechanism processed, to the barrel-like structure forced cooling of whole flue gas cool-down mechanism, when air conducting mechanism, cooling-down effect is not obvious
When, play a part of supplementing forced cooling.
Further technical scheme, forced cooling mechanism is equally distributed atomizer, and lowering temperature uniform, cooling face is big；
The heat-exchanger rig is board-like or pipe heat exchanger, and heat exchange efficiency is high, and cost is low.
Air-introduced machine is fixed at further technical scheme, air delivery tube outlet, plays a part of forced convertion, Ke Yiti
High heat exchange efficiency, and external residual heat using device, secondary utilize is carried out to waste heat；The depositing dust dust leg exit sets and puts ash
Valve, when stopping air inlet, concentrates and discharges bulky grain zincilate flue dust.
A kind of pretreating process of rotary hearth furnace zinc powder off-gas recovery pretreatment unit, step is：
Step 1: zinc-containing dust flue gas is imported：The flue gas of powder containing crude zinc that rotary hearth furnace is produced is by zinc-containing dust flue gas ingress pipe
The flue gas cool-down imported in first rotary hearth furnace flue gas cool-down device for reducing dust is in-house；
Step 2: gravity inertial subtracts dirt：Bulky grain zincilate flue dust is in its own gravity, the effect of inertia irregularly flowed
Under drop down onto dust board surface, and fall to flue gas cool-down actuator base along dust board；
Step 3: flue gas cool-down：Subtract the flue gas after dirt during the in-house rising of flue gas cool-down, in air conducting
In the presence of mechanism, two mechanisms heat exchange, the bulk temperature of whole flue gas cool-down mechanism declines, and the temperature for subtracting the flue gas after dirt is corresponding
Reduction；The bulky grain zincilate flue dust not dropped is by cold events, density increase, then in the presence of dust board stop, persistently falls
Drop down onto flue gas cool-down actuator base；
Step 4: subtracting dirt cooling flue gas export：Subtract the flue gas after dirt cooling to export to second by subtracting cloud of dust gas delivery line
Individual rotary hearth furnace flue gas cool-down device for reducing dust；
Step 5: the process of repeat step two, three and four, until to subtract flue gas derived from cloud of dust gas delivery line up to standard for final stage；
Step 6: final stage subtracts dirt cooling flue gas export：Subtract the flue gas after dirt cooling to subtract cloud of dust gas delivery line by final stage and lead
Go out to dust arrester installation (3) is passed through, the pretreatment for completing zinc powder is reclaimed；
Step 7: waste heat recovery：The heat produced after each air conducting mechanism is exchanged heat is derived in air delivery line
Cheng Zhong, is absorbed by heat-exchanger rig, and is utilized again by the way that residual heat using device is secondary.
Whole technical process cooling subtracts dirt, UTILIZATION OF VESIDUAL HEAT IN, zinc powder dust and reclaims progress simultaneously, moreover, converting cold without increase
Air-valve, it is to avoid blast change influences on whole dezincification production-line technique process variation.
3. beneficial effect
The technical scheme provided using the present invention, compared with prior art, is had the advantages that：
(1) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, each rotary hearth furnace flue gas cool-down depositing dust dress
Putting can be handled zinc-containing dust flue gas, and rotary hearth furnace flue gas cool-down device for reducing dust is by air conducting mechanism to whole dress
Put and cooled, bulky grain zincilate flue dust is due to temperature reduction, and density becomes big, so as to drop at the bottom of flue gas cool-down mechanism
Portion, reaches the effect for subtracting dirt step by step, and heat-exchanger rig absorbs the heat that air conducting mechanism exchanges heat by heat-exchanger rig, reaches heat
The effect recycled is measured, three mechanism synergies reach that zinc-containing dust flue gas cool-down falls to reclaiming, heat recovery integrates profit
Purpose, moreover, whole system converts cold blast sliding valve without increase, will not produce fluctuation to the technique of whole system；
(2) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, the barrel-like structure of closing, it is to avoid outside
Air-flow produces fluctuation to flue gas in whole technique, and system pressure difference resistance damages small, less than 150Pa, main process system (blower fan is not influenceed
Ability 12K Pa), it is not necessary to increase other devices, guarantee is provided for flue gas qualified discharge；The flowing of flue gas is V-shaped, lengthens
In flue gas in the in-house flow distance of whole flue gas cool-down, allow bulky grain zincilate flue dust have time enough cool and under
Fall；Closing in shape bucket bottom, and depositing dust dust leg are communicated, and are easy to the centralized collection of bulky grain zincilate flue dust and two after concentration ash discharge
Secondary to utilize, the Dust Capacity that whole device is collected is big, can be with the convenient production flexible organization of cycle cleaning, and maintenance cleaning facilitates fast
It is prompt；Reduce after flue-gas temperature, can reach that dreamboat enters bag-type dust or water film dedusting retracting device, realize bag-type dust
Substitute electric precipitation production；
(3) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, dust board stops the bulky grain of flowing
Afterwards, dropped due to the effect of inertia, and the air velocity of flue gas is gradually reduced, extension flue gas is in whole flue gas cool-down mechanism
Interior flowing time；Dust board can be arranged in parallel with multiple, further allow bulky grain zincilate flue dust to have time enough drop
Temperature simultaneously falls；And the flue-gas temperature of stable and uniform is fully buffered, the main technology stability of lifting production can to greatest extent reduce and convert cold
Wind, reduces main air blower load, lifts production capacity；And the bonding of zinc-containing dust, blockage problem are thoroughly solved, and cleaning facilitates fast
It is prompt；
(4) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, the barrel-shaped air that top is gradually closed up
Deflector, is easy to the hot-air after heat exchange to concentrate and secondary heat exchange utilization is carried out after outflow, it is possible to circulate for other systems,
Realize energy-saving and emission-reduction；Normal heat exchange is carried out by convection current, it is not necessary to increase the equipment such as blower fan and power consumption；
(5) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, the diaphragm that homogeneous vertical formula is fixed,
Both the convection velocity of air rising had been improved, the purpose of direct heat conduction can be played again, the in-house heat of flue gas cool-down had been passed
Export, improves the in-house cooling rate of flue gas cool-down；
(6) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, it is determined that accurate diaphragm distribution
Radian set and the angle of dust board is set, it is not necessary to increase other devices, guarantee provided for flue gas qualified discharge, pressure damage
Mistake is small, or even can also connect more than 2, realizes repeatedly cooling, depositing dust, reduces the stability requirement of cloth bag, the throwing of reduction cloth bag
Enter；Reduction is to sack cleaner cloth bag temperature requirement in final dusting, it is ensured that the safe operation of sack cleaner and cloth bag
It is required that, while reducing discharge flue-gas temperature, more than 1mm bulky grain can be handled more than 95%, prevent big big of amount of stored heat
The follow-up final dusting of particles effect, such as, if do not handled, bulky grain zincilate flue dust can be by the cloth bag (one in bag-type dust
As be chemical fibre material) scaling loss；Fully flue-gas temperature can be reduced by heat-shift, only ZnO little particles enter cloth bag, realize
Safe retrieving；
(7) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, the forced cooling machine of air conducting mechanism side wall
The setting of structure, it is therefore an objective to when temperature is too high in whole device has little time cooling, play a part of supplementing forced cooling, to reach
It is perfectly safe；
(8) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, flue gas cool-down mechanism diameter is the 3 of flue
More than times, it is therefore an objective to which, when production technology fluctuation causes stress fluctuation, flue gas cool-down mechanism plays " accumulator " effect, realizes whole
The steady of individual production system overall process, buffering and stability, are more matched with the parameter for reaching whole system, more efficient,
Regulation is easier；
(9) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, equally distributed atomizer, lowering temperature uniform,
Moreover, easily producing vapor, cooling effect is more obvious, efficiency high；But also when being that flue gas fluctuation is big during satisfaction is produced
A kind of realization of safeguard measure；Atomized water spraying fast cooling, it is possible to achieve zinc metal is directly reclaimed, it is not necessary to ensure oxygen-containing turn again
Into ZnO recyclings, bag collection efficiency is further improved, qualified discharge is realized；
(10) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, air-introduced machine is played to be forced to strengthen convection current to air
Effect, further to improve heat exchange efficiency；External residual heat using device can carry out secondary utilize to waste heat；
(11) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, the clean hot air that heat exchange is produced can
Dried for green-ball, or other productions, realize energy-saving and emission-reduction；
(12) pretreating process of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, whole technical process cooling
Subtract dirt, UTILIZATION OF VESIDUAL HEAT IN, fume recovery to carry out simultaneously, moreover, avoiding to whole technical process influence of fluctuations.
Brief description of the drawings
Fig. 1 is rotary hearth furnace zinc powder off-gas recovery pretreatment unit structural representation of the invention；
Fig. 2 is the A-A faces profile in Fig. 1；
Fig. 3 is dust board profile of the invention；
Fig. 4 is dust board side view of the invention；
Fig. 5 is the pretreating process flow chart of the rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present invention.
In figure：1st, rotary hearth furnace；2nd, rotary hearth furnace flue gas cool-down device for reducing dust；3rd, dust arrester installation；21st, air delivery line；22nd, contain
Zinc powder cloud of dust gas ingress pipe；23rd, flue gas cool-down mechanism；24th, cloud of dust gas delivery line is subtracted；25th, air conducting mechanism；26th, depositing dust is put
Ash pipe；27th, air conducting reinforcing mechanisms；28th, final stage subtracts cloud of dust gas delivery line；29th, forced cooling mechanism；210th, air intake；
211st, heat-exchanger rig；221st, dust board；261st, ash-removing valve；2211st, plate muscle.
Embodiment
To further appreciate that present disclosure, with reference to accompanying drawing, the present invention is described in detail.
Embodiment 1
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, as shown in figure 1, including：2 by subtracting cloud of dust gas
The rotary hearth furnace flue gas cool-down device for reducing dust 2 of the serial communication of delivery line 24；With the rotary hearth furnace flue gas cool-down device for reducing dust 2 of end
The dust arrester installation 3 that cloud of dust gas delivery line 28 is connected is subtracted by final stage, it is general to be gathered dust using sack cleaner, zincilate micronic dust is returned
It is used after receipts；Wherein：The rotary hearth furnace flue gas cool-down device for reducing dust 2 includes：Air conducting mechanism 25, can be in vertical
Barrel-like structure, a diameter of 3400mm is highly 4600mm, for cooling to whole device；In the air conducting mechanism
25 inside, and with air conducting mechanism 25 be in cavity loop nested structure flue gas cool-down mechanism 23, also in vertical tubbiness, diameter
It is highly 4000mm for 3000mm, bulky grain zincilate flue dust is due to temperature reduction, and density becomes big, drops in flue gas cool-down machine
The bottom of structure 23, reaches the effect for subtracting dirt step by step；The flue gas cool-down mechanism 23 is external pass air conducting mechanism 25 contain zinc
Dust flue gas ingress pipe 22 and subtract cloud of dust gas delivery line 24；The flue gas cool-down mechanism 23 is in the barrel-like structure closed, it is to avoid outer
Portion's air-flow produces fluctuation, the top phase of the zinc-containing dust flue gas ingress pipe 22 and barrel-like structure to flue gas in whole technique
Logical, barrel-like structure inwall is fixed with downwardly extending dust board 221, allows bulky grain zincilate flue dust because inertia and gravity are hit in dust-break
On plate 221, and there is time enough to cool and fall；It is described to subtract the upper side that cloud of dust gas delivery line 24 is fixed on barrel-like structure
Face, subtracts the flue gas after dirt and is exported by the pipeline；The bottom of the barrel-like structure is communicated in closing in shape, and depositing dust dust leg 26,
It is easy to the centralized collection of bulky grain zincilate flue dust and concentrates the secondary utilization after ash discharge.Zinc-containing dust flue gas ingress pipe 22, subtract
The diameter that cloud of dust gas delivery line 24 and final stage subtract cloud of dust gas delivery line 28 is 1000mm, and the diameter of flue gas cool-down mechanism 23 is flue gas
More than 3 times of pipeline, it is therefore an objective to which, when production technology fluctuation causes stress fluctuation, flue gas cool-down mechanism 23 plays " accumulator " work
With, the steady of whole production system overall process, buffering and stability are realized, is more matched with the parameter for reaching whole system,
More efficient, regulation is easier.
Embodiment 2
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 1, different and improvement
Be in：As shown in figure 3, dust board 221 is the upward arc plate of nock, the bulky grain zincilate flue dust of edges of boards is first concentrated on into arc
The bottom of flue gas cool-down mechanism 23 is fallen to behind bottom again；Effect also is that the relative area of cambered surface is more than flat board, bulky grain flue dust
Due to random motion during dropping, and arc plate can stop the bulky grain of arbitrary motion, and blocking surface is big, subtracts so as to improve
Dirt effect.
Embodiment 3
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 2, different and improvement
Be in：Be fixedly installed heat-exchanger rig 211 inside the headspace delivery line 21 of air conducting mechanism 25, can be board-like or
Pipe heat exchanger, the heat that air conducting mechanism 25 is exchanged heat is absorbed by heat-exchanger rig 211, reaches the effect of heat recovery and utilization
Really；The dust board 221 is in that, away from the swash plate shape for subtracting cloud of dust gas delivery line 24, the top fixing end of first swash plate is fixed on cigarette
The top of gas cooling mechanism 23, and by the import of zinc-containing dust flue gas ingress pipe 22 and subtract the outlet of cloud of dust gas delivery line 24 every
Open, after dust board 221 stops the bulky grain of flowing, dropped due to the effect of inertia, and make the air velocity of flue gas gradually
Reduction, flowing time of the extension flue gas in whole flue gas cool-down mechanism 23, further allows bulky grain zincilate flue dust to have enough
Time cool and fall.In the whole flue gas of flue gas cool-down mechanism 23 zinc containing gaseous state, liquid Zn in temperature-fall period due to inertia
Effect and drop, it is to avoid be bonded in heat-exchanger rig 211 and result in blockage, and then thoroughly solve being bonded, blocking up for zinc-containing dust
Plug problem, and clear up convenient and swift.
Air conducting mechanism 25 is in the drum structure that top is gradually closed up, and is easy to the hot-air after heat exchange to concentrate outflow laggard
Row secondary heat exchange is utilized, and diameter is more than the flue gas cool-down mechanism 23, and ring cavity is formed around flue gas cool-down mechanism；In the sky
In the ring cavity of the sleeved structure of chamber, stationary distribution has air conducting reinforcing mechanisms 27, improves air velocity, and improve heat exchange effect
Rate, ring cavity bottom is air intake 210.
Embodiment 4
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 3, different and improvement
Be in：Air conducting reinforcing mechanisms 27 be homogeneous vertical formula fix diaphragm, both improved air rising to flow velocity
Degree, can play the purpose of direct heat conduction again, and the in-house heat conduction of flue gas cool-down is exported, improved in flue gas cool-down mechanism
The cooling rate in portion.The top of flue gas cool-down mechanism 23, is provided with the forced cooling machine for being fixed on the side wall of air conducting mechanism 25
Structure 29, to the barrel-like structure forced cooling of whole flue gas cool-down mechanism, when air conducting mechanism cooling-down effect is not obvious, is played
Supplement the effect of forced cooling.Forced cooling mechanism 29 can be equally distributed atomizer, and lowering temperature uniform, cooling face is big.
Embodiment 5
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 4, different and improvement
Be in：Air-introduced machine is fixed in the exit of air delivery line 21, is played a part of forced convertion, can be improved heat exchange efficiency, and outside
Residual heat using device, such as evaporator are connect, secondary utilize is carried out to waste heat；The exit of depositing dust dust leg 26 sets ash-removing valve
261, when stopping air inlet, concentrate and discharge bulky grain zincilate flue dust.
Embodiment 6
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 4, different and improvement
Be in：Diaphragm is distributed as the radian setting every 20 °, altogether 18.The included angle of dust board 221 is 80 °；Air
Deflector 25 and the diameter of flue gas cool-down mechanism 23 ratio are 1.1：1；Flue gas cool-down mechanism 23, zinc-containing dust flue gas ingress pipe 22
It is with the diameter ratio for subtracting cloud of dust gas delivery line 24：3~5：1：1, be respectively in the present embodiment：5500mm, 5000mm, 1000mm and
1000mm。
The pretreating process of the rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, as shown in figure 5, step is：
Step 1: zinc-containing dust flue gas is imported：The element such as richness Zn, K in the flue gas of powder containing crude zinc that rotary hearth furnace 1 is produced, flue dust,
Typically more than 500 DEG C, and rich in bulky grain zincilate flue dust, such as diameter is more than 1mm, by zinc-containing dust flue gas ingress pipe 22
Import inside the flue gas cool-down mechanism 23 in first rotary hearth furnace flue gas cool-down device for reducing dust 2；
Step 2: gravity inertial subtracts dirt：Bulky grain zincilate flue dust is in its own gravity, the effect of inertia irregularly flowed
Under drop down onto the surface of dust board 221, and fall to the bottom of flue gas cool-down mechanism 23 along dust board 221；
Step 3: flue gas cool-down：Subtract the flue gas after dirt during rising inside flue gas cool-down mechanism 23, led in air
Flow in the presence of mechanism 25, two mechanisms heat exchange, the bulk temperature of whole flue gas cool-down mechanism 23 declines, and subtracts the temperature of the flue gas after dirt
The corresponding reduction of degree；The bulky grain zincilate flue dust not dropped is by cold events, density increase, then the effect stopped in dust board 221
Under, persistently fall to the bottom of flue gas cool-down mechanism 23；I.e.：Zinc-containing dust flue gas inside flue gas cool-down mechanism 23, either under
In drop or uphill process, the cooling effect due to air conducting mechanism 25 to flue gas cool-down mechanism 23 can all have bulky grain to contain
Zinc powder flue dust is lasting to drop, if flue gas cool-down mechanism 23 is sufficiently high, in theory, and all bulky grain zincilate flue dust all can be by
Gravity or inertia stop and dropped；
Step 4: subtracting dirt cooling flue gas export：Subtract the flue gas after dirt cooling to export to the by subtracting cloud of dust gas delivery line 24
Two rotary hearth furnace flue gas cool-down device for reducing dust 2；
Step 5: the process of repeat step two, three and four, until final stage subtract cloud of dust gas delivery line 28 derived from flue gas reach
Mark；
Step 6: final stage subtracts dirt cooling flue gas export：Subtract the flue gas after dirt cooling and cloud of dust gas delivery line 28 is subtracted by final stage
Export to dust arrester installation 4 is passed through, the pretreatment for completing zinc powder is reclaimed；
Step 7: waste heat recovery：The heat produced after each air conducting mechanism 25 is exchanged heat is led in air delivery line 21
During going out, absorbed by heat-exchanger rig 211, and again by residual heat using device, such as evaporator is secondary to be utilized.
After testing, flue gas after treatment, final stage subtracts after the export of cloud of dust gas delivery line 28, and temperature is less than 150 DEG C, and will
More than 1mm bulky grain is reduced to less than 10%, and bag-type dust collector will not be produced after destructive effect, bag-type dust,
More than 90% zinc powder is recovered, and flue gas zinc-containing dust is reduced to less than 5%.
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, the diameter of flue gas cool-down mechanism 23 is flue
5 times, it is therefore an objective to when production technology fluctuation causes stress fluctuation, by the release of the heat balance in flue to more than ten even
In the space of the flue gas cool-down mechanism 23 of twenties times of opposing seal, flue gas cool-down mechanism 23 plays " accumulator " effect, real
Now the steady of whole production system overall process, buffering and stability, are more matched, efficiency is more with the parameter for reaching whole system
Height, regulation is easier.
Embodiment 7
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 6, different and improvement
Be in：Diaphragm is distributed as the radian setting every 30 °, altogether 12.The included angle of dust board 221 is 70 °.
After testing, flue gas after treatment, final stage subtracts after the export of cloud of dust gas delivery line 28, and temperature is less than 120 DEG C, and will
More than 1mm bulky grain is reduced to less than 8%, and bag-type dust collector will not be produced after destructive effect, bag-type dust,
More than 95% zinc powder is recovered, and flue gas zinc-containing dust is reduced to less than 3%.
Embodiment 8
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 6, different and improvement
Be in：Diaphragm is distributed as the radian setting every 40 °, altogether 9.The included angle of dust board 221 is 75 °；3 lead to
The rotary hearth furnace flue gas cool-down device for reducing dust 2 of the serial communication of over-subtraction cloud of dust gas delivery line 24；
After testing, flue gas after treatment, subtracts after cloud of dust gas delivery line 28 exports, temperature is less than 100 DEG C, and by 1mm
Bulky grain above is reduced to less than 6%, bag-type dust collector will not be produced after destructive effect, bag-type dust, 97%
Above zinc powder is recovered, and flue gas zinc-containing dust is reduced to less than 3%.
Embodiment 9
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 5, diaphragm distribution
To be set every 30 ° of radian, 12 altogether.The included angle of dust board 221 is 70 °.
The pretreating process of the rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, step is：
Step 1: zinc-containing dust flue gas is imported：The element such as richness Zn, K in the flue gas of powder containing crude zinc that rotary hearth furnace 1 is produced, flue dust,
Typically more than 550 DEG C, and rich in bulky grain zincilate flue dust, such as diameter is more than 1mm, by zinc-containing dust flue gas ingress pipe 22
Import inside the flue gas cool-down mechanism 23 in first rotary hearth furnace flue gas cool-down device for reducing dust 2；
Step 2: gravity inertial subtracts dirt：Bulky grain zincilate flue dust is in its own gravity, the effect of inertia irregularly flowed
Under drop down onto the surface of dust board 221, and fall to the bottom of flue gas cool-down mechanism 23 along dust board 221；
Step 3: flue gas cool-down：Subtract the flue gas after dirt during rising inside flue gas cool-down mechanism 23, led in air
Flow in the presence of mechanism 25, two mechanisms heat exchange, the bulk temperature of whole flue gas cool-down mechanism 23 declines, and subtracts the temperature of the flue gas after dirt
The corresponding reduction of degree, because early stage entrance flue gas temperature is too high, starts staving progress of the atomizer to flue gas cool-down mechanism 23 strong
System cooling；Restart air-introduced machine, the convection current to the air in ring cavity is strengthened；So, to the staving of flue gas cool-down mechanism 23
The cooling-down effect of internal temperature is increased exponentially, and plays a part of collaboration；The bulky grain zincilate flue dust not dropped by cold events,
Density increases, then in the presence of the stop of dust board 221, persistently falls to the bottom of flue gas cool-down mechanism 23；I.e.：The zincilate cloud of dust
Gas declines inside flue gas cool-down mechanism 23, either in still uphill process, because air conducting mechanism 25 is to flue gas cool-down
The cooling effect of mechanism 23, can all have bulky grain zincilate flue dust is lasting to drop；
Step 4: subtracting dirt cooling flue gas export：Subtract the flue gas after dirt cooling to export to the by subtracting cloud of dust gas delivery line 24
Two rotary hearth furnace flue gas cool-down device for reducing dust 2；
Step 5: the process of repeat step two, three and four, until final stage subtract cloud of dust gas delivery line 28 derived from flue gas reach
Mark；
Step 6: final stage subtracts dirt cooling flue gas export：Subtract the flue gas after dirt cooling and cloud of dust gas delivery line 28 is subtracted by final stage
Export to dust arrester installation 4 is passed through, the pretreatment for completing zinc powder is reclaimed；
Step 7: waste heat recovery：The heat produced after each air conducting mechanism 25 is exchanged heat is led in air delivery line 21
During going out, absorbed, and utilized again by the way that residual heat using device is secondary by heat-exchanger rig 211.
After testing, flue gas after treatment, although early stage flue dust temperature is too high, final stage subtracts cloud of dust gas delivery line 28 and exported
Afterwards, temperature is less than 80 DEG C, and more than 1mm bulky grain is reduced to less than 6%, bag-type dust collector will not be produced destructive
Effect, after bag-type dust, more than 98% zinc powder is recovered, and flue gas zinc-containing dust is reduced to less than 2%.It is additionally, since air
Deflector 25 and flue gas cool-down mechanism 23 are relatively isolated, and strengthen convection current and forced cooling all without in flue gas cool-down mechanism 3
Portion's flue gas produces excessive fluctuation, would not also influence the fluctuation of whole technical process.
Embodiment 10
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 9, different and improvement
Be in：Because the vapor that atomizer is produced is excessive, heat-exchanger rig 211 and secondary waste heat can be influenceed to utilize the use of device
Life-span, therefore, for the zinc-containing dust flue gas no more than 350 DEG C, atomizer can not be started, it is necessary to when, it is only necessary to start
Air-introduced machine is that can reach the effect that cooling subtracts dirt.
Embodiment 11
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 9, different and improvement
Be in：As shown in Fig. 2 dust board 221 sets parallel to each other 3, by the flue gas uphill process of flue gas cool-down mechanism 23
It is divided into 3 parts, continues inertia to the bulky grain zincilate flue dust not dropped and stop that it rises and promotes it to drop.Such as Fig. 3,4
Shown, the radian of arc plate could be arranged to 90 to 120 °, and vertical plate muscle 2211 can also be uniformly distributed in arc plate surface, or
Vibrator is fixed on arc plate, to strengthen the landing of bulky grain zincilate flue dust.
Embodiment 12
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure be the same as Example 9, different and improvement
Be in：Heat-exchanger rig 211 is no longer fixedly installed inside air delivery line 21, rotary hearth furnace flue gases are dried by different levels by induced duct
After the air delivery line 21 of cooling device for reducing dust is connected, then by air-introduced machine by the clean hot air after heat exchange, it can be used for life
Ball is dried, and can also be led directly to rotary hearth furnace 1 or other productions, be realized energy-saving and emission-reduction.
Schematical above that the present invention and embodiments thereof are described, the description does not have restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel are enlightened by it, without departing from the spirit of the invention, are designed and the technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit, it is characterised in that including：
At least two is by subtracting the rotary hearth furnace flue gas cool-down device for reducing dust (2) of cloud of dust gas delivery line (24) serial communication；
Pass through gathering dust that final stage subtracts that cloud of dust gas delivery line (28) connects with the rotary hearth furnace flue gas cool-down device for reducing dust (2) of end
Device (3)；Wherein：
The rotary hearth furnace flue gas cool-down device for reducing dust (2) includes：
Air conducting mechanism (25)；
Dropped in the inside of the air conducting mechanism (25), and with air conducting mechanism (25) in the flue gas of cavity loop nested structure
Warm mechanism (23)；
The external zinc-containing dust flue gas ingress pipe (22) for passing air conducting mechanism (25) of the flue gas cool-down mechanism (23) and subtract
Cloud of dust gas delivery line (24)；
The flue gas cool-down mechanism (23) is in the barrel-like structure closed, the zinc-containing dust flue gas ingress pipe (22) and barrel-like structure
Top communicate, barrel-like structure inwall is fixed with downwardly extending dust board (221)；The cloud of dust gas delivery line (24) that subtracts is fixed on bucket
The upper side of shape structure；The bottom of the barrel-like structure is communicated in closing in shape, and depositing dust dust leg (26).
2. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 1, it is characterised in that：The dust board
(221) it is the upward arc plate of nock.
3. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 1, it is characterised in that：
Heat-exchanger rig (211) is fixedly installed inside the headspace delivery line (21) of the air conducting mechanism (25)；
The dust board (221) is in that, away from the swash plate shape for subtracting cloud of dust gas delivery line (24), the top fixing end of first swash plate is consolidated
Due to the top of flue gas cool-down mechanism (23), and by the import of zinc-containing dust flue gas ingress pipe (22) and subtract cloud of dust gas delivery line
(24) outlet is separated.
4. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 3, it is characterised in that：The air conducting
Mechanism (25) is in the drum structure that top is gradually closed up, and diameter is more than the flue gas cool-down mechanism (23)；In the cavity ring set
In the ring cavity of formula structure, stationary distribution has air conducting reinforcing mechanisms (27), and ring cavity bottom is air intake (210).
5. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 4, it is characterised in that：The air conducting
Reinforcing mechanisms (27) are the diaphragm that homogeneous vertical formula is fixed.
6. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 5, it is characterised in that：The diaphragm
It is distributed as the radian setting every 20~40 °；The oblique angle of the dust board (221) is 70~80 °.
7. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 5, it is characterised in that：The flue gas cool-down
The top of mechanism (23), is provided with the forced cooling mechanism (29) for being fixed on air conducting mechanism (25) side wall.
8. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 7, it is characterised in that：The forced cooling
Mechanism (29) is equally distributed atomizer；The heat-exchanger rig (211) is board-like or pipe heat exchanger.
9. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 7, it is characterised in that：The air export
Manage (21) exit and fix air-introduced machine, and external residual heat using device；Depositing dust dust leg (26) exit sets ash-removing valve
(261)。
10. the pretreating process of rotary hearth furnace zinc powder off-gas recovery pretreatment unit described in a kind of claim 6, it is characterised in that
Step is：
Step 1: zinc-containing dust flue gas is imported：The flue gas of powder containing crude zinc that rotary hearth furnace (1) is produced is by zinc-containing dust flue gas ingress pipe
(22) the flue gas cool-down mechanism (23) imported in first rotary hearth furnace flue gas cool-down device for reducing dust (2) is internal；
Step 2: gravity inertial subtracts dirt：Bulky grain zincilate flue dust falls in its own gravity, the effect of inertia irregularly flowed
Flue gas cool-down mechanism (23) bottom is fallen to dust board (221) surface, and along dust board (221)；
Step 3: flue gas cool-down：Subtract the flue gas after dirt during rising inside flue gas cool-down mechanism (23), in air conducting
In the presence of mechanism (25), two mechanisms heat exchange, the bulk temperature of whole flue gas cool-down mechanism (23) declines, and subtracts the flue gas after dirt
Temperature is accordingly reduced；The bulky grain zincilate flue dust not dropped is increased by cold events, density, then stop in dust board (221)
Under effect, flue gas cool-down mechanism (23) bottom is persistently fallen to；
Step 4: subtracting dirt cooling flue gas export：Subtract the flue gas after dirt cooling to export to second by subtracting cloud of dust gas delivery line (24)
Individual rotary hearth furnace flue gas cool-down device for reducing dust (2)；
Step 5: the process of repeat step two, three and four, until to subtract flue gas derived from cloud of dust gas delivery line (28) up to standard for final stage；
Step 6: final stage subtracts dirt cooling flue gas export：Subtract the flue gas after dirt cooling to subtract cloud of dust gas delivery line (28) by final stage and lead
Go out to dust arrester installation (3) is passed through, the pretreatment for completing zinc powder is reclaimed；
Step 7: waste heat recovery：The heat produced after each air conducting mechanism (25) is exchanged heat is led in air delivery line (21)
During going out, absorbed, and utilized again by the way that residual heat using device is secondary by heat-exchanger rig (211).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109395521A (en) * | 2018-12-10 | 2019-03-01 | 福州中澳科技有限公司 | A kind of aluminum products polishing dust controlling device |
| CN112322819A (en) * | 2019-12-10 | 2021-02-05 | 日铁工程技术株式会社 | Rotary hearth furnace, method for using same, and method for producing reduced iron-containing material and zinc-containing material |
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| CN2045670U (en) * | 1989-03-22 | 1989-10-11 | 个旧市矿产加工总厂 | Wet dust collector |
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