CN107217151B - 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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- CN107217151B CN107217151B CN201710638424.4A CN201710638424A CN107217151B CN 107217151 B CN107217151 B CN 107217151B CN 201710638424 A CN201710638424 A CN 201710638424A CN 107217151 B CN107217151 B CN 107217151B
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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
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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
- B01D45/04—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 recovery processing technical field.The present invention includes 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 to 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 closed barrel-like structure, is communicated at the top of the zinc-containing dust flue gas ingress pipe and barrel-like structure, barrel-like structure inner wall is fixed with downwardly extending dust board；The upper side for subtracting cloud of dust gas delivery line and being fixed on barrel-like structure；The bottom of the barrel-like structure is communicated in closing and depositing dust dust leg.The present invention is relatively isolated by least two-stage forced cooling mechanism and air tour guide mechanism to flue gas cool-down, and by natural gravity and inertial dust collection, has reached recycling crude zinc powder and flue gas cool-down to 150 DEG C hereinafter, and guaranteeing the stable purpose of entire recovery process system.
Description
Technical field
The present invention relates to rotary hearth furnace zinc powder recovery processing 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 technique
The sludge Dust Capacity generated in steel production is the 10% of output of steel, and rotary hearth furnace metallized pellet dezincification produces
Line is mainly used for direct-reduction processing steel plant's metallurgy sludge dust, with elements such as Zn, K in recovered flue gas in production process,
Since the particularity of the elements such as Zn, K causes recovery process complexity, existing rotary hearth furnace metallized pellet dezincification apparatus for production line
Configuration is perfect not to the utmost, operating rate is not high, and influences on the main technique of production process big.
Since dezincification temperature is higher, zinc containing gaseous state, liquid Zn in flue gas are bonded in and change usually in recycling temperature-fall period
Cause heat exchanger to block in hot device, need frequently clear up maintenance, and temperature it is high flue gas fluctuation be easy to the last recycling of scaling loss
Cloth bag.
Simultaneously in order to guarantee that flue gas enters existing general bag-type dust collector, requires design installation and convert cold blast sliding valve reduction
Flue-gas temperature not only increases the treating capacity of gas cleaning, since wind pressure increases, is also easy to cause to produce the fluctuation of main technique,
The energy consumption of main air blower is also increased simultaneously.
50mg/m may be implemented in bag-type dust recyclable device3It discharges below, but the characteristic requirements flue-gas temperature of cloth bag is stablized
150 DEG C of holding is hereinafter, most ideal at 100 DEG C or less.Therefore the pretreated requirement of cooling of the zinc-containing dust flue gas of dezincification technique,
Increasingly highlight.
Through retrieving, 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 insulation flue, insulation flue one end are connected to the cooling cigarette of converter gasification
Road, the other end connect one section of evaporator, and one section of connection of evaporator is atomized cooling Venturi tube, are atomized cooling Venturi tube and connect evaporator
Two sections, two sections of connection economizers of evaporator, economizer connects inertia force dust-extraction unit；Hot water in economizer enters evaporator one
After section and two sections of evaporator, saturated steam is generated by its internal flue gas with heat；It is atomized in cooling Venturi tube and sets
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 the double medium spray guns being atomized inside cooling Venturi tube spray exchanges heat, and the flue-gas temperature after heat exchange is in
In the range of 580 DEG C -600 DEG C, to effectively contain the localized clusters of carbon monoxide in flue gas, avoids and occur to dodge quick-fried danger
Danger, so that the equipment is using safer.But the benefit of fume afterheat is reinforced in the invention by one section of evaporator, two sections of evaporator
With, and diameter processing is carried out to flue dust with spray gun and cannot be recycled, that is, water source is wasted, and produce new pollution sources.
Summary of the invention
1. technical problems to be solved by the inivention
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
It is low, cooling effect is unobvious, installation convert cold blast sliding valve be easy to cause entire dezincification production-line technique fluctuate the problem of, the present invention provide
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 tour guide mechanism is relatively isolated to flue gas cool-down, and by natural gravity and inertial dust collection, has reached recycling crude zinc powder and cigarette
Gas cools to 150 DEG C hereinafter, and guaranteeing the stable purpose of entire recovery process system.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention is：
A kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit, including：At least two is connected by subtracting the series connection of cloud of dust gas delivery line
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 will be used after the recycling of zincilate micronic dust；Wherein：The rotary hearth furnace flue gas cool-down depositing dust dress
Set including：Air conducting mechanism, for cooling down 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 since temperature reduces, density becomes larger bulky grain zincilate flue dust,
The bottom in flue gas cool-down mechanism is fallen, achievees the effect that subtract dirt step by step；The flue gas cool-down mechanism is external to be pierced by 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 in closed barrel-like structure, is kept away
Exempt from outer gas stream and generates fluctuation, the top phase of the zinc-containing dust flue gas ingress pipe and barrel-like structure in entire technique to flue gas
Logical, barrel-like structure inner wall is fixed with downwardly extending dust board, allows bulky grain zincilate flue dust since inertia and gravity are hit in dust board
On, and there is time enough to cool down and fall；The upper side for subtracting cloud of dust gas delivery line and being fixed on barrel-like structure, after subtracting dirt
Flue gas exported by the pipeline；The bottom of the barrel-like structure is communicated in closing and depositing dust dust leg, is contained convenient for bulky grain
The centralized collection and the secondary use after concentration ash discharge of zinc powder flue dust.
Further technical solution, dust board are the upward arc plate of nock, and the bulky grain zincilate flue dust of edges of boards is first collected
In fall to flue gas cool-down actuator base again behind arc bottom；Effect also is that the relative area of cambered surface is greater than plate, bulky grain
Flue dust fall during due to random movement, and arc plate can stop the bulky grain of arbitrary motion, subtract dirt effect to improve
Fruit.
Further technical solution is fixedly installed heat exchange dress inside the headspace delivery line of the air conducting mechanism
It sets, the heat that air conducting mechanism is exchanged heat is absorbed by heat-exchanger rig, achievees the effect that heat recovery and utilization；The dust board
In away from the inclined plate shape for subtracting cloud of dust gas delivery line, the top fixing end of first inclined plate is fixed on the top of flue gas cool-down mechanism,
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, due to inertia effect and fall, and gradually decrease the air velocity of flue gas, extend flue gas in entire flue gas cool-down machine
Flowing time in structure further allows bulky grain zincilate flue dust to have time enough to cool down and fall.
Further technical solution, air conducting mechanism is in the drum structure that top is gradually closed up, convenient for the heat after heat exchange
Air carries out secondary heat exchange utilization after concentrating outflow, and diameter is greater than the flue gas cool-down mechanism, the shape around flue gas cool-down mechanism
At 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 solution, air conducting reinforcing mechanisms are the fixed diaphragm of homogeneous vertical formula, are both improved
The convection velocity that air rises, and directly thermally conductive purpose can be played, flue gas cool-down heat conduction export within the organization mentions
The in-house cooling rate of high flue gas cool-down.
Further technical solution, diaphragm are distributed as being arranged every 20~40 ° of radian, when being distributed overstocked, influence
Air quantity enters, and heat exchange when being distributed thin, influences wind speed using less；The oblique angle of the dust board is 70~80 °, is not had
The effect of inertial impaction, when angle too small, particle is easy accumulation and is not easy to fall in plate face.
Further technical solution, the top of flue gas cool-down mechanism are provided with and are fixed on the strong of air conducting mechanism side wall
Cooling mechanism processed, to the barrel-like structure forced cooling of entire flue gas cool-down mechanism, when air conducting mechanism cooling effect is unobvious
When, play the role of supplementing forced cooling.
Further technical solution, forced cooling mechanism be equally distributed atomizer, lowering temperature uniform, cooling face it is big；
The heat-exchanger rig is board-like or pipe heat exchanger, and heat exchange efficiency is high, at low cost.
Further technical solution, fixed air-introduced machine, plays the role of forced convertion, Ke Yiti at air delivery tube outlet
High heat exchange efficiency, and external residual heat using device carry out secondary use to waste heat；Ash is put in the setting of depositing dust dust leg exit
Valve when stopping air inlet, is concentrated and bulky grain zincilate flue dust is discharged.
A kind of pretreating process of rotary hearth furnace zinc powder off-gas recovery pretreatment unit, step are：
Step 1: zinc-containing dust flue gas imports：The flue gas of powder containing crude zinc that rotary hearth furnace generates 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：The effect of inertia that bulky grain zincilate flue dust is flowed in its own gravity, irregularly
Dust-break plate surface is fallen to, and falls to flue gas cool-down actuator base along dust board；
Step 3: flue gas cool-down：Flue gas after subtracting dirt is during flue gas cool-down in-house rising, in air conducting
Under the action of mechanism, the bulk temperature of the heat exchange of two mechanisms, entire flue gas cool-down mechanism declines, and the temperature of the flue gas after subtracting dirt is corresponding
It reduces；The bulky grain zincilate flue dust not fallen is increased by cold events, density, then under the action of dust board stops, is persistently fallen
Drop down onto flue gas cool-down actuator base；
Step 4: subtracting dirt cooling flue gas export：Flue gas after subtracting dirt cooling is exported by subtracting cloud of dust gas delivery line to second
A rotary hearth furnace flue gas cool-down device for reducing dust；
Step 5: the process Step 2: three and four is repeated, 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：Flue gas after subtracting dirt cooling, which subtracts cloud of dust gas delivery line by final stage, leads
Out to dust arrester installation (3) are passed through, the pretreatment recycling of zinc powder is completed；
Step 7: waste heat recycles：The heat generated after the heat exchange of each air conducting mechanism is derived in air delivery line
Cheng Zhong is absorbed by heat-exchanger rig, and passes through residual heat using device secondary use again.
Entire technical process cooling subtracts dirt, UTILIZATION OF VESIDUAL HEAT IN, the recycling of zinc powder dust while carrying out, moreover, converting without increase cold
Air-valve, avoiding wind pressure variation influences entire dezincification production-line technique process variation.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, have 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
Zinc-containing dust flue gas can be handled by setting, and rotary hearth furnace flue gas cool-down device for reducing dust is by air conducting mechanism to entire dress
It sets and cools down, bulky grain zincilate flue dust is since temperature reduces, and density becomes larger, to fall the bottom in flue gas cool-down mechanism
Portion achievees the effect that subtract dirt step by step, and the heat that heat-exchanger rig exchanges heat air conducting mechanism is absorbed by heat-exchanger rig, reaches heat
The effect recycled is measured, three mechanism synergistic effects reach the recycling of zinc-containing dust flue gas cool-down whereabouts, the comprehensive benefit of heat recovery
Purpose will not generate fluctuation to the technique of whole system moreover, whole system converts cold blast sliding valve without increasing；
(2) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, closed barrel-like structure avoid outside
Air-flow generates fluctuation to flue gas in entire technique, and system pressure difference resistance damage is small, is less than 150Pa, does not influence main process system (blower
Ability 12K Pa), it does not need to increase other devices, provides guarantee for flue gas qualified discharge；The flowing of flue gas is V-shaped, lengthens
In flue gas in entire flue gas cool-down flow distance within the organization, allow bulky grain zincilate flue dust have time enough cool down and under
It falls；Closing bucket bottom and depositing dust dust leg communicate, convenient for two after the centralized collection and concentration ash discharge of bulky grain zincilate flue dust
Secondary utilization, the Dust Capacity that whole device is collected is big, can be cleared up with the period and facilitate production flexible organization, and overhaul cleaning facilitate it is fast
It is prompt；After reducing flue-gas temperature, dreamboat can be reached and enter bag-type dust or water film dedusting recyclable 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 stop the bulky grain of flowing
Afterwards, it is fallen due to the effect of inertia, and gradually decreases the air velocity of flue gas, extend flue gas in entire flue gas cool-down mechanism
Interior flowing time；Dust board can be arranged in parallel with multiple, and bulky grain zincilate flue dust is further allowed to have time enough drop
Temperature simultaneously falls；And sufficiently buffer the flue-gas temperature of stable and uniform, promoted and produce main technology stability, can reduce to greatest extent convert it is cold
Wind reduces main air blower load, promotes production capacity；And thoroughly solve the bonding of zinc-containing dust, blockage problem, and cleaning facilitate it is 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 carries out secondary heat exchange utilization after concentrating outflow convenient for the hot-air after heat exchange, and can recycle for other systems,
Realize energy-saving and emission-reduction；Normal heat exchange is carried out by convection current, does not need to increase equipment and the power consumptions such as blower；
(5) a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, the fixed diaphragm of homogeneous vertical formula,
Not only the convection velocity of air rising had been improved, but also directly thermally conductive purpose can be played, flue gas cool-down heat within the organization 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 setting and the angle of dust board be arranged, do not need to increase other devices, provide guarantee for flue gas qualified discharge, pressure is damaged
It loses small, or even can also connect 2 or more, realize repeatedly cooling, depositing dust, reduce the stability requirement of cloth bag, reduce the throwing of cloth bag
Enter；It reduces to bag filter cloth bag temperature requirement in final dusting, ensure that safe operation and the cloth bag of bag filter
It is required that while reduce discharge flue-gas temperature, the bulky grain of 1mm or more can be handled 95% or more, prevent big big of amount of stored heat
The subsequent final dusting of particles effect, for example, bulky grain zincilate flue dust can be by the cloth bag (one in bag-type dust if do not handled
As be chemical fibre material) scaling loss；Heat, which can sufficiently be exchanged, reduces flue-gas temperature, and only ZnO little particle enters cloth bag, realizes
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 excessively high in whole device has little time cooling, play the role 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
Times or more, it is therefore an objective to when production technology fluctuation causes stress fluctuation, flue gas cool-down mechanism plays the role of " accumulator ", realizes whole
The steady of a production system overall process, buffering and stability, are more matched with reaching the parameter of whole system, more efficient,
Adjusting is easier；
(9) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, equally distributed atomizer, lowering temperature uniform,
Moreover, being easy to produce vapor, cooling effect is more obvious, high-efficient；But also when being that flue gas fluctuates big in satisfaction production
A kind of realization of safeguard measure；Atomized water spraying fast cooling may be implemented zinc metal and directly recycle, and not need to guarantee oxygen-containing turn again
At ZnO recycling, bag collection efficiency is further increased, realizes qualified discharge；
(10) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, air-introduced machine, which plays, to be forced air to reinforce convection current
Effect, to further increase heat exchange efficiency；External residual heat using device can carry out secondary use to waste heat；
(11) rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, the clean hot air that heat exchange generates, can
To realize energy-saving and emission-reduction for green-ball drying or other productions；
(12) pretreating process of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention, entire technical process cooling
Subtract dirt, UTILIZATION OF VESIDUAL HEAT IN, fume recovery while carrying out, moreover, avoiding to entire technical process influence of fluctuations.
Detailed description of the invention
Fig. 1 is rotary hearth furnace zinc powder off-gas recovery pretreatment unit structural schematic diagram of the invention；
Fig. 2 is the face the A-A sectional view in Fig. 1；
Fig. 3 is dust board sectional view of the invention；
Fig. 4 is dust board side view of the invention；
Fig. 5 is the pretreating process flow chart of rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the invention.
In figure：1, rotary hearth furnace；2, rotary hearth furnace flue gas cool-down device for reducing dust；3, dust arrester installation；21, air delivery line；22, contain
Zinc powder cloud of dust gas ingress pipe；23, flue gas cool-down mechanism；24, subtract cloud of dust gas delivery line；25, air conducting mechanism；26, depositing dust is put
Ash pipe；27, air conducting reinforcing mechanisms；28, final stage subtracts cloud of dust gas delivery line；29, forced cooling mechanism；210, air intake；
211, heat-exchanger rig；221, dust board；261, ash-removing valve；2211, plate muscle.
Specific embodiment
To further appreciate that the contents of the present invention, in conjunction with attached 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 24 serial communication of delivery line；With the rotary hearth furnace flue gas cool-down device for reducing dust 2 of end
The dust arrester installation 3 for subtracting the connection of cloud of dust gas delivery line 28 by final stage, is generally gathered dust using bag filter, and 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, diameter 3400mm are highly 4600mm, for cooling down to whole device；In the air conducting mechanism
25 inside, and with air conducting mechanism 25 in the flue gas cool-down mechanism 23 of cavity loop nested structure, it is also in vertical tubbiness, diameter
It is highly 4000mm for 3000mm, since temperature reduces, density becomes larger, falls in flue gas cool-down machine bulky grain zincilate flue dust
The bottom of structure 23 achievees the effect that subtract dirt step by step；The flue gas cool-down mechanism 23 is external be pierced by air conducting mechanism 25 containing 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 closed barrel-like structure, is avoided outer
Portion's air-flow generates fluctuation, the top phase of the zinc-containing dust flue gas ingress pipe 22 and barrel-like structure to flue gas in entire technique
Logical, barrel-like structure inner wall is fixed with downwardly extending dust board 221, allows bulky grain zincilate flue dust since inertia and gravity are hit in dust-break
On plate 221, and there is time enough to cool down and fall；The upper side for subtracting cloud of dust gas delivery line 24 and being fixed on barrel-like structure
Face, the flue gas after subtracting dirt are exported by the pipeline；The bottom of the barrel-like structure is communicated in closing and depositing dust dust leg 26,
Convenient for the secondary use after the centralized collection and concentration ash discharge of bulky grain zincilate flue dust.Zinc-containing dust flue gas ingress pipe 22 subtracts
The diameter that cloud of dust gas delivery line 24 and final stage subtract cloud of dust gas delivery line 28 is 1000mm, and 23 diameter of flue gas cool-down mechanism is flue gas
3 times or more 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, it realizes the steady of entire production system overall process, buffering and stability, is more matched with reaching the parameter of whole system,
More efficient, adjusting is easier.
Embodiment 2
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 1
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
23 bottom of flue gas cool-down mechanism is fallen to behind bottom again；Effect also is that the relative area of cambered surface is greater than plate, bulky grain flue dust
Due to random movement during falling, and arc plate can stop the bulky grain of arbitrary motion, and blocking surface is big, subtract to improve
Dirt effect.
Embodiment 3
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 2
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
The heat that air conducting mechanism 25 exchanges heat is absorbed by heat-exchanger rig 211, reaches the effect of heat recovery and utilization by pipe heat exchanger
Fruit；The dust board 221 is in away from the inclined plate shape for subtracting cloud of dust gas delivery line 24, and the top fixing end of first inclined 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, due to inertia effect and fall, and make the air velocity of flue gas gradually
It reduces, extends flowing time of the flue gas in entire flue gas cool-down mechanism 23, bulky grain zincilate flue dust is further allowed to have enough
Time cool down and fall.Zinc containing gaseous state, liquid Zn are in temperature-fall period due to inertia in 23 flue gas of entire flue gas cool-down mechanism
Effect and fall, avoid being bonded in heat-exchanger rig 211 and result in blockage, and then thoroughly solve the bonding, stifled of zinc-containing dust
Plug problem, and clear up convenient and efficient.
Air conducting mechanism 25 is in the drum structure that top is gradually closed up, and concentrates outflow laggard convenient for the hot-air after heat exchange
Row secondary heat exchange utilizes, and diameter is greater than the flue gas cool-down mechanism 23, forms ring cavity 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 improves heat exchange effect
Rate, ring cavity bottom are air intake 210.
Embodiment 4
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 3
Be in：Air conducting reinforcing mechanisms 27 are the fixed diaphragm of homogeneous vertical formula, both improved air rising to flow velocity
Degree, and directly thermally conductive purpose can be played, flue gas cool-down heat conduction export within the organization improves 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 25 side wall of air conducting mechanism
Structure 29 plays the barrel-like structure forced cooling of entire flue gas cool-down mechanism when air conducting mechanism cooling effect is unobvious
Supplement the effect of forced cooling.Forced cooling mechanism 29 can be equally distributed atomizer, lowering temperature uniform, cooling face it is big.
Embodiment 5
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 4
Be in：Air-introduced machine is fixed in 21 exit of air delivery line, plays the role of forced convertion, heat exchange efficiency can be improved, and outer
Residual heat using device, such as evaporator are connect, secondary use is carried out to waste heat；Ash-removing valve is arranged in 26 exit of depositing dust dust leg
261, when stopping air inlet, concentrates and bulky grain zincilate flue dust is discharged.
Embodiment 6
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 4
Be in：Diaphragm is distributed as being arranged every 20 ° of radian, amounts to 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 imports：The flue gas of powder containing crude zinc that rotary hearth furnace 1 generates, the elements such as richness Zn, K in flue dust,
Generally at 500 DEG C or more, and it is rich in bulky grain zincilate flue dust, for example diameter is greater than 1mm, by zinc-containing dust flue gas ingress pipe 22
It imports 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：The effect of inertia that bulky grain zincilate flue dust is flowed in its own gravity, irregularly
221 surface of dust board is fallen to, and falls to 23 bottom of flue gas cool-down mechanism along dust board 221；
Step 3: flue gas cool-down：During flue gas after subtracting dirt rises inside flue gas cool-down mechanism 23, led in air
Under the action of flowing mechanism 25, the heat exchange of two mechanisms, the bulk temperature decline of entire flue gas cool-down mechanism 23, the temperature of the flue gas after subtracting dirt
Degree is corresponding to be reduced；The bulky grain zincilate flue dust not fallen is increased by cold events, density, then the effect stopped in dust board 221
Under, persistently fall to 23 bottom of flue gas cool-down mechanism；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 be fallen, if flue gas cool-down mechanism 23 is sufficiently high, theoretically, all bulky grain zincilate flue dust all can be by
Gravity or inertia stop and fall；
Step 4: subtracting dirt cooling flue gas export：Flue gas after subtracting dirt cooling is exported by subtracting cloud of dust gas delivery line 24 to the
Two rotary hearth furnace flue gas cool-down device for reducing dust 2；
Step 5: the process Step 2: three and four is repeated, until final stage subtracts flue gas derived from cloud of dust gas delivery line 28 and reaches
Mark；
Step 6: final stage subtracts dirt cooling flue gas export：Flue gas after subtracting dirt cooling subtracts cloud of dust gas delivery line 28 by final stage
Export the pretreatment recycling that zinc powder is completed to dust arrester installation 4 is passed through；
Step 7: waste heat recycles：The heat generated after the heat exchange of each air conducting mechanism 25 is led in air delivery line 21
It during out, is absorbed by heat-exchanger rig 211, and passes through residual heat using device, such as evaporator secondary use again.
Through detecting, flue gas after treatment, final stage subtracts after cloud of dust gas delivery line 28 exports, and temperature, and will less than 150 DEG C
The bulky grain of 1mm or more is reduced to 10% hereinafter, destructive effect will not be generated to bag-type dust collector, after bag-type dust,
90% or more zinc powder is recovered, and flue gas zinc-containing dust is reduced to 5% or less.
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, even by the release of the heat balance in flue to more than ten
In the space of the flue gas cool-down mechanism 23 of twenties times of opposing seal, flue gas cool-down mechanism 23 plays the role of " accumulator ", real
Now the steady of entire production system overall process, buffering and stability, are more matched, efficiency is more with reaching the parameter of whole system
Height, adjusting are easier.
Embodiment 7
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 6
Be in：Diaphragm is distributed as being arranged every 30 ° of radian, amounts to 12.The included angle of dust board 221 is 70 °.
Through detecting, flue gas after treatment, final stage subtracts after cloud of dust gas delivery line 28 exports, and temperature, and will less than 120 DEG C
The bulky grain of 1mm or more is reduced to 8% hereinafter, destructive effect will not be generated to bag-type dust collector, after bag-type dust,
95% or more zinc powder is recovered, and flue gas zinc-containing dust is reduced to 3% or less.
Embodiment 8
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 6
Be in：Diaphragm is distributed as being arranged every 40 ° of radian, amounts to 9.The included angle of dust board 221 is 75 °；3 logical
Cross the rotary hearth furnace flue gas cool-down device for reducing dust 2 for subtracting 24 serial communication of cloud of dust gas delivery line；
Through detecting, flue gas after treatment subtracts after cloud of dust gas delivery line 28 exports, and temperature is less than 100 DEG C, and by 1mm
Above bulky grain is reduced to 6% hereinafter, destructive effect will not be generated to bag-type dust collector, after bag-type dust, 97%
The above zinc powder is recovered, and flue gas zinc-containing dust is reduced to 3% or less.
Embodiment 9
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure is the same as embodiment 5, diaphragm distribution
To be arranged every 30 ° of radian, amount to 12.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 are：
Step 1: zinc-containing dust flue gas imports：The flue gas of powder containing crude zinc that rotary hearth furnace 1 generates, the elements such as richness Zn, K in flue dust,
Generally at 550 DEG C or more, and it is rich in bulky grain zincilate flue dust, for example diameter is greater than 1mm, by zinc-containing dust flue gas ingress pipe 22
It imports 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：The effect of inertia that bulky grain zincilate flue dust is flowed in its own gravity, irregularly
221 surface of dust board is fallen to, and falls to 23 bottom of flue gas cool-down mechanism along dust board 221；
Step 3: flue gas cool-down：During flue gas after subtracting dirt rises inside flue gas cool-down mechanism 23, led in air
Under the action of flowing mechanism 25, the heat exchange of two mechanisms, the bulk temperature decline of entire flue gas cool-down mechanism 23, the temperature of the flue gas after subtracting dirt
Degree is corresponding to be reduced, and since entrance flue gas temperature early period is excessively high, starting atomizer carries out the staving of flue gas cool-down mechanism 23 strong
System cooling；Restart air-introduced machine, the convection current of the air in ring cavity is reinforced；In this way, to the staving of flue gas cool-down mechanism 23
The cooling effect of internal temperature increases exponentially, and plays the role of collaboration；The bulky grain zincilate flue dust not fallen by cold events,
Density increases, then under the action of dust board 221 stops, persistently falls to 23 bottom of flue gas cool-down mechanism；I.e.：The zincilate cloud of dust
Gas is inside flue gas cool-down mechanism 23, either in decline or uphill process, since 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 fall；
Step 4: subtracting dirt cooling flue gas export：Flue gas after subtracting dirt cooling is exported by subtracting cloud of dust gas delivery line 24 to the
Two rotary hearth furnace flue gas cool-down device for reducing dust 2；
Step 5: the process Step 2: three and four is repeated, until final stage subtracts flue gas derived from cloud of dust gas delivery line 28 and reaches
Mark；
Step 6: final stage subtracts dirt cooling flue gas export：Flue gas after subtracting dirt cooling subtracts cloud of dust gas delivery line 28 by final stage
Export the pretreatment recycling that zinc powder is completed to dust arrester installation 4 is passed through；
Step 7: waste heat recycles：The heat generated after the heat exchange of each air conducting mechanism 25 is led in air delivery line 21
It during out, is absorbed by heat-exchanger rig 211, and passes through residual heat using device secondary use again.
Through detecting, flue gas after treatment, although early period, flue dust temperature was excessively high, final stage subtracts the export of cloud of dust gas delivery line 28
Afterwards, temperature is reduced to 6% less than 80 DEG C, and by the bulky grain of 1mm or more hereinafter, will not generate to bag-type dust collector destructive
Effect, after bag-type dust, 98% or more zinc powder is recovered, and flue gas zinc-containing dust is reduced to 2% or less.Moreover, because air
Deflector 25 and flue gas cool-down mechanism 23 are relatively isolated, and reinforce convection current and forced cooling all will not be in flue gas cool-down mechanism 3
Portion's flue gas generates excessive fluctuation, would not also influence the fluctuation of entire technical process.
Embodiment 10
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 9
Be in：Since the vapor that atomizer generates is excessive, it will affect heat-exchanger rig 211 and secondary waste heat utilize the use of device
Therefore service life for being no more than 350 DEG C of zinc-containing dust flue gas, can not start atomizer, when needing, it is only necessary to start
Air-introduced machine is the effect that can reach cooling and subtract dirt.
Embodiment 11
The rotary hearth furnace zinc powder off-gas recovery pretreatment unit of the present embodiment, basic structure are different and improvement with embodiment 9
Be in：As shown in Fig. 2, parallel to each other 3 are arranged in dust board 221, it will be in the flue gas uphill process of flue gas cool-down mechanism 23
It is divided into 3 parts, inertia is continued to the bulky grain zincilate flue dust not fallen and stops it to rise and it is promoted to fall.Such as Fig. 3,4
Shown, the radian of arc plate can be set 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 reinforce 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 are different and improvement with embodiment 9
Be in：Heat-exchanger rig 211 is no longer fixedly installed inside air delivery line 21, by induced duct by drying rotary hearth furnace flue gases at different levels
After the air delivery line 21 of cooling device for reducing dust is connected to, then pass through air-introduced machine for the clean hot air after heat exchange, can be used for giving birth to
Ball is dry, can also lead directly to rotary hearth furnace 1 or other productions, realizes energy-saving and emission-reduction.
Schematically the present invention and embodiments thereof are described above, description is not limiting, institute in attached drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited to this.So if the common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (8)
1. a kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit, which is characterized in that including：
At least two is by subtracting cloud of dust gas delivery line（24）The rotary hearth furnace flue gas cool-down device for reducing dust of serial communication（2）；
With the rotary hearth furnace flue gas cool-down device for reducing dust of end（2）Subtract cloud of dust gas delivery line by final stage（28）Connection is gathered dust
Device（3）；Wherein：
The rotary hearth furnace flue gas cool-down device for reducing dust（2）Including：
Air conducting mechanism（25）；
In the air conducting mechanism（25）Inside, and with air conducting mechanism（25）It is dropped in the flue gas of cavity loop nested structure
Warm mechanism（23）；
The flue gas cool-down mechanism（23）It is external to be pierced by air conducting mechanism（25）Zinc-containing dust flue gas ingress pipe（22）With subtract
Cloud of dust gas delivery line（24）；
The flue gas cool-down mechanism（23）In closed barrel-like structure, the zinc-containing dust flue gas ingress pipe（22）With barrel-like structure
Top communicate, barrel-like structure inner wall is fixed with downwardly extending dust board（221）；It is described to subtract cloud of dust gas delivery line（24）It is fixed on bucket
The upper side of shape structure；The bottom of the barrel-like structure is in closing and depositing dust dust leg（26）It communicates；
The dust board（221）For the upward arc plate of nock；
The air conducting mechanism（25）Headspace delivery line（21）Inside is fixedly installed heat-exchanger rig（211）；
The dust board（221）Subtract cloud of dust gas delivery line in deviating from（24）Inclined plate shape, the top fixing end of first inclined plate is solid
Due to flue gas cool-down mechanism（23）Top, and by zinc-containing dust flue gas ingress pipe（22）Import and subtract cloud of dust gas delivery line
（24）Outlet separate.
2. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 1, it is characterised in that：The air conducting
Mechanism（25）The drum structure gradually to close up in top, diameter are greater 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）, ring cavity bottom is air intake（210）.
3. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 2, it is characterised in that：The air conducting
Reinforcing mechanisms（27）For the diaphragm that homogeneous vertical formula is fixed.
4. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 3, it is characterised in that：The diaphragm
It is distributed as being arranged every 20~40 ° of radian；The dust board（221）Oblique angle is 70~80 °.
5. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 3, it is characterised in that：The flue gas cool-down
Mechanism（23）Top, be provided with and be fixed on air conducting mechanism（25）The forced cooling mechanism of side wall（29）.
6. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 5, it is characterised in that：The forced cooling
Mechanism（29）For equally distributed atomizer；The heat-exchanger rig（211）For board-like or pipe heat exchanger.
7. rotary hearth furnace zinc powder off-gas recovery pretreatment unit according to claim 5, it is characterised in that：The air export
Pipe（21）Air-introduced machine, and external residual heat using device are fixed in exit；The depositing dust dust leg（26）Ash-removing valve is arranged in exit
（261）.
8. the pretreating process of rotary hearth furnace zinc powder off-gas recovery pretreatment unit described in a kind of claim 4, which is characterized in that step
Suddenly it is：
Step 1: zinc-containing dust flue gas imports：Rotary hearth furnace（1）The flue gas of powder containing crude zinc generated is by zinc-containing dust flue gas ingress pipe
（22）Import first rotary hearth furnace flue gas cool-down device for reducing dust（2）In flue gas cool-down mechanism（23）It is internal；
Step 2: gravity inertial subtracts dirt：The effect of inertia that bulky grain zincilate flue dust is flowed in its own gravity, irregularly falls
To dust board（221）Surface, and along dust board（221）Fall to flue gas cool-down mechanism（23）Bottom；
Step 3: flue gas cool-down：Flue gas after subtracting dirt is in flue gas cool-down mechanism（23）During inside rises, in air conducting
Mechanism（25）Under the action of, the heat exchange of two mechanisms, entire flue gas cool-down mechanism（23）Bulk temperature decline, flue gas after subtracting dirt
Temperature accordingly reduces；The bulky grain zincilate flue dust not fallen is increased by cold events, density, then in dust board（221）Stop
Under effect, flue gas cool-down mechanism is persistently fallen to（23）Bottom；
Step 4: subtracting dirt cooling flue gas export：Flue gas after subtracting dirt cooling is by subtracting cloud of dust gas delivery line（24）It exports to second
A rotary hearth furnace flue gas cool-down device for reducing dust（2）；
Step 5: the process Step 2: three and four is repeated, until final stage subtracts cloud of dust gas delivery line（28）Derived flue gas is up to standard；
Step 6: final stage subtracts dirt cooling flue gas export：Flue gas after subtracting dirt cooling subtracts cloud of dust gas delivery line by final stage（28）It leads
Out to being passed through dust arrester installation（3）, complete the pretreatment recycling of zinc powder；
Step 7: waste heat recycles：By each air conducting mechanism（25）The heat generated after heat exchange is in air delivery line（21）It leads
During out, pass through heat-exchanger rig（211）It absorbs, and passes through residual heat using device secondary use again.
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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 |
| JP7456762B2 (en) * | 2019-12-10 | 2024-03-27 | 日鉄エンジニアリング株式会社 | Rotary hearth furnace and method for using the same, and method for producing reduced iron-containing products and zinc-containing products |
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| CN2045670U (en) * | 1989-03-22 | 1989-10-11 | 个旧市矿产加工总厂 | Wet dust collector |
| CN201443950U (en) * | 2009-08-06 | 2010-04-28 | 铁岭市粮食科学研究所 | Grain drier energy-saving purification device |
| CN201618473U (en) * | 2010-03-12 | 2010-11-03 | 李强 | Flue purification device with dedusting, desulfurizing and cooling functions |
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| CN207193362U (en) * | 2017-07-31 | 2018-04-06 | 马鞍山钢铁股份有限公司 | A kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2045670U (en) * | 1989-03-22 | 1989-10-11 | 个旧市矿产加工总厂 | Wet dust collector |
| CN201443950U (en) * | 2009-08-06 | 2010-04-28 | 铁岭市粮食科学研究所 | Grain drier energy-saving purification device |
| CN201618473U (en) * | 2010-03-12 | 2010-11-03 | 李强 | Flue purification device with dedusting, desulfurizing and cooling functions |
| CN107243186A (en) * | 2017-07-24 | 2017-10-13 | 马鞍山钢铁股份有限公司 | A kind of metallurgical raw material drying exhaust gas dust recovery system and its recovery process |
| CN207193362U (en) * | 2017-07-31 | 2018-04-06 | 马鞍山钢铁股份有限公司 | A kind of rotary hearth furnace zinc powder off-gas recovery pretreatment unit |
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