CN108870994B - The residual neat recovering system and method for liquid blast furnace - Google Patents
The residual neat recovering system and method for liquid blast furnace Download PDFInfo
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- CN108870994B CN108870994B CN201810804409.7A CN201810804409A CN108870994B CN 108870994 B CN108870994 B CN 108870994B CN 201810804409 A CN201810804409 A CN 201810804409A CN 108870994 B CN108870994 B CN 108870994B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The present invention relates to the residual neat recovering system of liquid blast furnace and methods, can take into account the waste heat recycling and slag particle quality of liquid blast furnace.Residual neat recovering system includes main heat exchange device, granulator, driver, superheater, evaporator, preheater, gas-liquid separator and air-jet device.In exhaust heat recovering method, liquid blast furnace in granulator fly out due to the effect of centrifugal force granulator and towards the inner wall of working chamber movement become spheric granules, the cold air heat exchange of the ejection of spheric granules and air-jet device cools to 800 DEG C or less, spheric granules and superheater after cooling, main heat exchange device is discharged after successively exchanging heat in evaporator and preheater, the cold water of preheater and spheric granules, which exchange heat, to be formed level-one hot water and enters gas-liquid separator, second level hot water in gas-liquid separator enters evaporator and spheric granules exchanges heat to form gas-liquid mixture return gas-liquid separator, saturated vapor in gas-liquid separator enters superheater and spheric granules exchanges heat to form superheated vapor discharge.
Description
Technical field
The present invention relates to the residual neat recovering system of liquid blast furnace and methods.
Background technique
Liquid blast furnace is the byproduct of blast furnace ironmaking, and discharge temperature is at 1450 DEG C or more.2017, China Steel enterprise
The liquid blast furnace yield of industry is about 2.45 hundred million tons, and the heat contained is equivalent to 1.5 times of the three gorges hydropower plant generated energy.Mesh
Before, the processing method of liquid blast furnace mainly uses water quenching to make its rapid cooling that is, with a large amount of water slug liquid blast furnace
To 80 DEG C hereinafter, and generating a large amount of vapor.This method does not only recycle the heat of liquid blast furnace, consumes simultaneously
A large amount of new water.The sulphur of liquid blast furnace and water, which react, generates sulfide, is discharged into atmosphere with steam, aggravating working environment,
Threaten the life security of periphery crowd.
As environmental protection becomes increasingly conspicuous with energy problem, the dry granulation and heat recovery technology of liquid blast furnace obtained
Extensive concern and actively research and development, but industrial application is not yet received, main cause is just difficult to take into account the waste heat of liquid blast furnace
Recycling and the quality of slag particle regulate and control.Since the chilling speed of Water Quenching Slag is fast, vitreum content is very high, is the excellent of production cement
Material, currently, most Water Quenching Slags contribute to production slag cements.So in the same of recovering liquid blast furnace slag waste heat
When, the quality of slag particle is also taken into account, waste heat liquid blast furnace after the recovery is made to can be realized resource utilization.
Since the glass transition temperature of liquid blast furnace is between 900~1100 DEG C, so the liquid in this temperature range
The cooling rate of blast furnace slag is greater than its critical cooling rate, guarantees clinker vitreum content with higher.
Summary of the invention
(1) technical problems to be solved
The present invention, which provides, can take into account the waste heat recycling of liquid blast furnace and the waste heat of the liquid blast furnace of slag particle quality returns
Receive system and method.
(2) technical solution
One aspect of the present invention provides a kind of residual neat recovering system of liquid blast furnace, comprising: main heat exchange device, main heat exchange dress
There is working chamber in setting, working chamber feed inlet and hot-blast outlet are communicated at the top of working chamber, bottom is communicated with working chamber and goes out
Material mouth；Granulator and driver in working chamber, the entrance of the working chamber feed inlet alignment granulator of main heat exchange device, drive
Dynamic device is connect to drive its rotation to carry out centrifugal granulation with granulator；Towards the lower zone jet for being located at granulator in working chamber
Air-jet device；Superheater, evaporator, preheater in working chamber, superheater, evaporator and preheater are located at jet dress
The lower section in the jet region set simultaneously from top to bottom is arranged successively；Gas-liquid separator, gas-liquid separator have entrance, liquid outlet and
Gas vent, with the entrance entered for cold water and for the outlet of level-one hot water discharge, evaporator has for second level heat preheater
The entrance that water enters and the outlet for gas-liquid mixture discharge, superheater are steamed with the entrance entered for saturated vapor and for overheat
The outlet of gas discharge, the outlet of preheater are connected to the entrance of gas-liquid separator, the entrance of evaporator and the liquid of gas-liquid separator
Body outlet, the outlet of evaporator are connected to the entrance of gas-liquid separator, the entrance of superheater and the gas of gas-liquid separator
Outlet.
According to the present invention, further includes: the hot air intake of heat exchanger, heat exchanger is connected to hot-blast outlet, the hot water of heat exchanger
Outlet is connected to the entrance of gas-liquid separator, and the hot air heat exchange of cold water and the discharge of main heat exchange device in heat exchanger is formed heat
Water is sent into gas-liquid separator, and the cold air outlet of heat exchanger is connected to air-jet device, by hot wind that main heat exchange device is discharged with change
The exchange heat cold wind to be formed of cold water in hot device is sent into air-jet device.
According to the present invention, air-jet device includes cold air air inlet pipe, ring pipe and multiple air jet pipes, and ring pipe is set in master and changes
Outside thermal, multiple air jet pipes are evenly arranged around the center line of ring pipe；The entrance of cold air air inlet pipe and the cold air of heat exchanger
The outlet of outlet, cold air air inlet pipe is connected to ring pipe, and the entrance of air jet pipe is connected to ring pipe, and the outlet of air jet pipe is stretched
Enter in working chamber with towards the lower zone jet for being located at granulator in working chamber.
According to the present invention, the outlet of air jet pipe tilts upward.
According to the present invention, working chamber from top to bottom includes granulation area, transition region and the heat transfer zone being sequentially communicated；Granulator position
In granulation area；The inner wall of transition region from top to bottom slopes inwardly；Work chamber discharge port is connected to heat transfer zone, air-jet device direction
Heat transfer zone jet, superheater, evaporator and preheater are located in heat transfer zone.
According to the present invention, the bottom of heat transfer zone is tapered, and working chamber discharge outlet is equipped with the working chamber discharging for controlling its aperture
Mouth control valve；Main heat exchange device outer wall wraps up insulating layer；Protective cover is fixed on the outside of driver.
According to the present invention, superheater, evaporator and preheater are tubulose, and superheater, evaporator and preheater are
Any one of round tube, elliptical tube, rhumbatron, triangle tube and hexagonal tube.
According to the present invention, gas-liquid separator is drum.
Another aspect of the present invention is provided more than a kind of residual neat recovering system using any of the above-described carries out liquid blast furnace
The method of recuperation of heat, comprising: granulation of the liquid blast furnace through being rotated by driver driving in working chamber feed inlet injection granulator
Liquid blast furnace in device flies out due to the effect of centrifugal force granulator and to be moved, liquid in the process towards the inner wall of working chamber
State blast furnace slag becomes spheric granules；Spheric granules encounters the cold air moved downward after the inner wall of working chamber with the ejection of air-jet device
Heat exchange, spheric granules cool to 800 DEG C or less, wherein make the cold of spheric granules by controlling the jet rate of air-jet device
But rate be greater than liquid blast furnace critical cooling rate, cold air exchange heat the hot wind to be formed from hot-blast outlet discharge main heat exchange dress
It sets；Spheric granules after cooling continues to move downward successively to exchange heat with superheater, evaporator and preheater, and spherical after cooling
Main heat exchange device is discharged from work chamber discharge port in grain, wherein cold water and spheric granules in preheater exchange heat to form level-one hot water
Into gas-liquid separator, the second level hot water isolated in gas-liquid separator enters evaporator, second level hot water and ball in evaporator
Shape particle, which exchanges heat, to be formed gas-liquid mixture and enters gas-liquid separator, and the saturated vapor that gas-liquid separator separates go out enters superheater,
Saturated air and spheric granules in superheater exchange heat to form superheated vapor discharge superheater.
(3) beneficial effect
In residual neat recovering system of the invention and the method using the progress waste heat recycling of above-mentioned residual neat recovering system, equal energy
Enough by liquid blast furnace slag granulation at spheric granules, while it being based on the theory of " temperature counterpart, cascade utilization ", that is, uses air-jet device
To the spheric granules chilling of high temperature, subsequent spheric granules successively with three groups of heat exchange equipments (superheater, evaporator and preheatings of setting
Device) heat exchange, and heat exchange area is increased in conjunction with spheric granules, it not only ensure that the spheric granules for obtaining high vitreum content, but also make
The latent heat and high temperature sensible heat for obtaining liquid blast furnace are comprehensively recyled, hence it is evident that are reduced the operation cost of enterprise, enhanced
Enterprise competitiveness.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the residual neat recovering system of liquid blast furnace provided by specific embodiment；
Fig. 2 is the schematic top plan view of the air-jet device in Fig. 1；
Fig. 3 is the schematic front view of the air-jet device in Fig. 2；
Fig. 4 to Fig. 8 is the partial cross-sectional view of five kinds of structures of Section A-A in Fig. 1, shows in fork row's arrangement and difference
Rounded pipe, oval pipe, hexagonal tube, rhumbatron, the preheater of triangle tube, superheater, evaporator.
[description of symbols]
1: working chamber feed inlet；2: main heat exchange device；3: air jet pipe；4: ring pipe；5: evaporator；6: superheater；7: pre-
Hot device；8: work chamber discharge port control valve；9: pump；10: pump；11: gas-liquid separator；12: heat transfer zone；13: transition region；14: grain
Change area；15: driver；16: granulator；17: hot-blast outlet；18: cold air air inlet pipe；19: circulating fan；20: heat exchanger；21:
Heat exchanger tube；22: pump.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.The term positions such as "top" mentioned by this paper, "bottom", " lower section " are orientated reference with Fig. 1.Institute herein
" cold " that refers to, " heat " are the relative concept of heat exchange front and back.
Referring to Fig.1, a kind of residual neat recovering system of liquid blast furnace is provided in the present embodiment, residual neat recovering system master changes
Thermal 2, granulator 16, driver 15, superheater 5, evaporator 6, preheater 7, gas-liquid separator 11, heat exchanger 20 and jet
Device.
There is working chamber in main heat exchange device 2, working chamber feed inlet 1 and hot-blast outlet are communicated at the top of working chamber
17, bottom is communicated with work chamber discharge port.Working chamber feed inlet 1 in the present embodiment, can pass through for receiving liquid blast furnace
One filling tube is connected to the top of working chamber, and the lower part of the filling tube is considered as working chamber feed inlet 1.
Granulator 16 and driver 15 are set in working chamber, and the top surface of granulator 16 is a flat surface or top surface has cavity,
The bottom of granulator 16 is connect with driver 12.The top of the intermediate region of the above-mentioned plane of granulator 16 or cavity as a result,
Open middle section is the entrance of granulator 16, the annular region in the open close outside in the outside or cavity of horizontal edge
(namely open fringe region of cavity) is that granulate exports.The working chamber feed inlet 1 of main heat exchange device 2 is directed at granulator 16
Entrance.Driver 15 drives the rotation of granulator 16 to carry out centrifugal granulation, specifically the liquid blast furnace in granulator 16
Be broken into due to the effect of centrifugal force spherical droplets fly out granulator 16 and towards the inner wall of working chamber move (preferably liquid blast furnace
The motion profile of slag is the inner wall of horizontally toward working chamber).Liquid blast furnace its surface tension during flight makes its guarantor
Holding shape, and exchange heat in flight course with working chamber internal gas (gas sprayed from air-jet device described below)
Making shell, gradually hard solidification forms the spheric granules with wick-containing.Spheric granules is indicated with circular granular in Fig. 1.
Air-jet device is rectangular towards the lower zone jet for being located at granulator 16 in working chamber, that is, under granulator 16
At jet region, bubbling bed or fluidized bed are formed below granulator 16.Thus the spheric granules after work cavity wall is hit
It falls under gravity, the cold air that spheric granules is sent into dropping process with air-jet device quickly exchanges heat, that is, passes through control
The jet rate (essentially high speed jet) of air-jet device processed being faced to make the cooling rate of spheric granules be greater than liquid blast furnace
Boundary's cooling rate realizes quick heat exchange, so that the temperature fast cooling of spheric granules is to 800 DEG C hereinafter, spherical at this time
Grain vitreum content with higher, has preferable slag particle quality, the wick-containing in spheric granules is also solidified as in the process
Solid.And the cold air that air-jet device sprays gradually absorb heat and forms hot wind and move upwards, from the discharge main heat exchange device of hot-blast outlet 17
2。
Superheater 5, evaporator 6, preheater 7 are set in the working chamber of main heat exchange device 2, and superheater 5, evaporator 6
It is located at the lower section in the jet region of air-jet device with preheater 7 and is from top to bottom arranged successively, thus spheric granules falls to spray
Continue to fall after below gas region, and continues successively to change with superheater 5, evaporator 6 and preheater 7 during falling herein
Heat, i.e., successively with the media for heat exchange in superheater 5, evaporator 6 and preheater 7.Preheater 7 have the entrance that enters for cold water with
For the outlet of level-one hot water discharge, the outlet that evaporator 6 has the entrance entered for second level hot water and is discharged for gas-liquid mixture,
Superheater 5 is with the entrance entered for saturated vapor and for the outlet of superheated vapor discharge.
Gas-liquid separator 11 is for realizing gas-liquid separation.Gas-liquid separator 11 has entrance, liquid outlet and gas vent.
Wherein, the entrance connection supply cold water pipeline of preheater 7, the setting pump 9 on the pipeline.The outlet of preheater 7 with
The entrance of gas-liquid separator 11 is connected to, and the cold water of the supply in preheater 7 is preheated device 7 from spheric granules when passing through preheater 7
The heat of absorption enters gas-liquid separator 11 at level-one hot water, level-one hot water.The setting of preheater 7 is to reduce master and change
The temperature for the spheric granules that thermal 2 is discharged, recycling afterheat of slags as much as possible.
Wherein, the liquid outlet of the entrance of evaporator 6 and gas-liquid separator 11 is equipped with pump by pipeline connection, the pipeline
10.The outlet of evaporator 6 is connected to the entrance of gas-liquid separator 11.Second level hot water in gas-liquid separator 11 is (than level-one hot water
Temperature it is high) heat that is absorbed by evaporator 6 from spheric granules when passing through evaporator 6, part hot water evaporates to form steam,
Second level hot water forms gas-liquid mixture through evaporator 6 and enters gas-liquid separator 11, and the liquid in gas-liquid mixture is mixed into gas-liquid point
Second level hot water is formed in liquid from script in device 11.
Wherein, the entrance of superheater 5 is connected to the gas vent of gas-liquid separator 11.It is isolated in gas-liquid separator 11
Saturated vapor enters superheater 5 and the heat by being absorbed by superheater 5 from spheric granules when superheater 5 is steamed at overheat
Gas, superheated vapor discharge superheater 5 can be used as energy use, such as generating electricity or being incorporated to steam pipe network etc..
In the present embodiment, the spheric granules by the cooling to exchange heat with superheater 5, evaporator 6, preheater 7 is from work
Chamber discharge port discharge main heat exchange device 2 be collected, packing transport cement manufacturing facility to, at this time the temperature of spheric granules 50 DEG C with
Under.
The residual neat recovering system of the present embodiment can be by liquid blast furnace slag granulation at spheric granules as a result, while being based on " temperature
Spend counterpart, cascade utilization " theory, i.e., using air-jet device to the spheric granules chilling of high temperature, subsequent spheric granules successively with
The heat exchange of three groups of heat exchange equipments (the water direct heat-exchange production steam i.e. in medium temperature particle and superheater and evaporator, the low temperature being arranged
The mode of particle and the water heat exchange for being supplied into heat retrieving apparatus), and heat exchange area is increased in conjunction with spheric granules, it both ensure that acquisition
The spheric granules of high vitreum content, and the latent heat of liquid blast furnace and high temperature sensible heat are comprehensively recyled, it is bright
The aobvious operation cost for reducing enterprise, enhances enterprise competitiveness.In addition, the system is using high temperature spheric granules and is set to work
The mode of water direct heat-exchange production steam in intracavitary evaporator 6, avoids and enters waste heat boiler life using production hot-air
The power consumption and energy loss of this mode of producing steam are capable of the waste heat of more efficiently recovering liquid blast furnace slag, are greatly reduced
Energy consumption promotes enterprise competitiveness.
Further, in the present embodiment, the cold water inlet of heat exchanger 20 connects the pipeline for feeding cold water, on the pipeline
Equipped with pump 22.The hot air intake of heat exchanger 20 is connected to the hot-blast outlet 17 of main heat exchange device 2 by hot air duct, heat exchanger 20
Hot water outlet be connected to the entrance of gas-liquid separator 11, by the cold water and the heat that is discharged of main heat exchange device 2 in heat exchanger 20
Wind exchanges heat the hot water to be formed feeding gas-liquid separator 11 as make-up water.And the cold air outlet of heat exchanger 20 and air-jet device connect
Logical, the cold wind that the hot air heat exchange that cold water and main heat exchange device 2 are discharged is formed is sent into air-jet device and is recycled.So set
It sets, chilling not only has been carried out to spheric granules, heat exchanger 20 has also carried out heat recovery, air-jet device, superheater 5, evaporator
6, the cooperation of preheater 7 and heat exchanger 20, the waste heat for realizing different energy levels recycle entirely.Preferably, heat exchanger 20 is waste heat pot
Furnace, is equipped with heat exchanger tube 21 in heat exchanger 20, and cold water enters heat exchanger tube 21 and as flowing becomes hot water.
In conjunction with Fig. 2 and Fig. 3, in the present embodiment, air-jet device includes cold air air inlet pipe 18, ring pipe 4 and multiple jets
Pipe 3, ring pipe 4 are set in outside main heat exchange device 2, and multiple air jet pipes 3 are evenly arranged around the center line of ring pipe 4.Cold air into
The entrance of tracheae 18 is connected to the cold air outlet of heat exchanger 20, and the outlet of cold air air inlet pipe 18 is connected to ring pipe 4, air jet pipe 3
Entrance be connected to ring pipe 4, the outlet of air jet pipe 3 is protruded into working chamber with towards the lower section for being located at granulator 16 in working chamber
Region jet, it is preferred that the outlet of air jet pipe 3 tilts upward.
The cold air of heat exchanger 20 enters working chamber through cold air air inlet pipe 18, ring pipe 4, air jet pipe 3 as a result,.Cold air into
Tracheae 18 is equipped with circulating fan 19 and is used to carry out circulating cold air, so can be energy saving to the recycling of cold air, reduces
Cost.
In the present embodiment, superheater 5, evaporator 6 and preheater 7 are tubulose, and arrangement mode can be divided into in-line arrangement row
Column and fork row arrangement (Fig. 4 is fork row arrangement into Fig. 8).Referring to Fig. 4 to Fig. 8, tubulose superheater 5, evaporator 6 and preheater
7 can be any in round tube (Fig. 4), elliptical tube (Fig. 5), hexagonal tube (Fig. 6), rhumbatron (Fig. 7) and triangle tube (Fig. 8)
Kind.And as can be seen which kind of the tube section shape of the either superheater 5 of tubulose is, in working chamber in from Fig. 4 to Fig. 8
Solid cylinder is regularly fixed on inner wall, and (cylinder is marked out in figure with oblique line, and the cross sectional shape of the cylinder is half
The tube section shape of superheater 5), to guarantee the regularity of arrangement mode, and then guarantee particle in the nowed forming of all positions
It is almost the same, eliminate the wall attachment effect of particle flow.
Further, in the present embodiment, gas-liquid separator 11 is drum.
Further, referring to Fig.1, in the present embodiment, working chamber from top to bottom includes the granulation area 14 being sequentially communicated, transition
Area 13 and heat transfer zone 12.Being granulated area 14 is cylinder, and granulator 16 is located in granulation area 14, and hot-blast outlet 17 and granulation area 14 connect
It is logical.The inner wall of transition region 13 from top to bottom slopes inwardly in cone, and air-jet device is towards 12 jet of heat transfer zone, i.e. air jet pipe 3
Outlet be connected to heat transfer zone 12.Work chamber discharge port is connected to heat transfer zone 12, and superheater 5, evaporator 6 and preheater 7
In heat transfer zone 12, the bottom of heat transfer zone 12 is tapered in cone, and the setting of working chamber discharge outlet controls the work of its aperture
Chamber discharge port control valve 8.
Thermal insulation material is wrapped up outside main heat exchange device 2 forms the insulating layer (heat preservation of the main heat exchange device referring to shown in figure
Layer), to reduce the radiation loss of high-temperature particle.
Granulator 16 is process by stainless steel, and bottom is directly connect with driver 15, is fixed in the outside of driver 15
There is protective cover.Granulator 16 is preferably cup type in the present embodiment, and the maximum outside diameter of granulator 16 is 50-400mm.Granulator 16
Revolving speed is 100rpm~2000rpm, and the spherical particle diameters of acquisition are greater than 0 and are less than or equal to 5mm.
Further, above-mentioned each control valve is electronic.
To sum up, included the following steps: using the method that above-mentioned residual neat recovering system carries out waste heat recycling to liquid blast furnace
S1, liquid blast furnace through working chamber feed inlet 1 inject granulator 16 in (preferably at this time granulator 16 via driving
The driving of device 15 rotation)；
S2, flown out granulation due to the effect of centrifugal force by the liquid blast furnace in the granulator 16 of the driving rotation of driver 15
Device 16 is simultaneously moved towards the inner wall of working chamber, and liquid blast furnace becomes spheric granules in the process；
S3, spheric granules move downward after encountering the inner wall of working chamber and the cold air of the ejection of air-jet device exchanges heat, spherical
Particle cools to 800 DEG C or less, wherein makes spherical by controlling the jet rate (essentially high speed jet) of air-jet device
Grain cooling rate be greater than liquid blast furnace critical cooling rate, cold air exchange heat the hot wind to be formed from hot-blast outlet 17 be discharged lead
Heat-exchanger rig is to heat exchanger 20；
Spheric granules after S4, cooling continues to move downward successively to exchange heat with superheater 5, evaporator 6 and preheater 7, cold
But main heat exchange device 2 is discharged from work chamber discharge port in the spheric granules after.Wherein, the cold water in preheater 7 is changed with spheric granules
Thermosetting level-one hot water enters gas-liquid separator 11, and the second level hot water isolated in gas-liquid separator 11 enters evaporator 6, evaporation
Second level hot water in device 6 and spheric granules, which exchange heat, to be formed gas-liquid mixture and enters gas-liquid separator 11, and gas-liquid separator 11 separates
Saturated vapor out enters superheater 5, and the saturated air in superheater 5 and spheric granules exchange heat to form superheated vapor discharge overheat
Device 5.Wherein, hot wind exchanges heat with cold water to form cold air and be sent into air-jet device and recycle in heat exchanger 20, feeds in heat exchanger 20
Cold water absorb heat to be formed hot water be sent into gas-liquid separator 11.
It as a result, can be by liquid blast furnace slag granulation at spherical shape using the method that above-mentioned residual neat recovering system carries out waste heat recycling
Particle, the residual neat recovering system of the present embodiment can be by liquid blast furnace slag granulation at spheric granules as a result, while being based on " temperature
The theory of counterpart, cascade utilization ", i.e., using air-jet device to the spheric granules chilling of high temperature, subsequent spheric granules successively with set
The heat exchange of three groups of heat exchange equipments (the water direct heat-exchange production steam i.e. in medium temperature particle and superheater and evaporator, the low temperature set
The mode that grain exchanges heat with the water for being supplied into heat retrieving apparatus), and heat exchange area is increased in conjunction with spheric granules, it both ensure that acquisition is high
The spheric granules of vitreum content, and the latent heat of liquid blast furnace and high temperature sensible heat are comprehensively recyled, hence it is evident that
The operation cost for reducing enterprise, enhances enterprise competitiveness.In addition, there is no collect to irony for spheric granules after cooling
Device constitutes the problem of pollution, can carry out pollution-free processing, is packaged, transported outward for example, spheric granules can flow into packaging bag.
It is to be appreciated that describing the skill simply to illustrate that of the invention to what specific embodiments of the present invention carried out above
Art route and feature, its object is to allow those skilled in the art to can understand the content of the present invention and implement it accordingly, but
The present invention is not limited to above-mentioned particular implementations.All various changes made within the scope of the claims are repaired
Decorations, should be covered by the scope of protection of the present invention.
Claims (8)
1. a kind of residual neat recovering system of liquid blast furnace characterized by comprising
Main heat exchange device (2) has working chamber in the main heat exchange device (2), is communicated with work at the top of the working chamber
Chamber feed inlet (1) and hot-blast outlet (17), bottom are communicated with work chamber discharge port, and the working chamber from top to bottom includes successively connecting
Logical granulation area (14), transition region (13) and heat transfer zone (12)；
Granulator (16) and driver (15) in the working chamber, the working chamber feed inlet of the main heat exchange device (2)
(1) it is directed at the entrance of the granulator (16), the driver (15) connect with the granulator (16) to drive it to be rotated into
Row centrifugal granulation, the granulator (16) are located in the granulation area (14), and the granulator (16) is cup type, the granulator
(16) top surface has cavity, and the maximum outside diameter of the granulator (16) is 50-400mm, and the revolving speed of the granulator (16) is
100rpm~2000rpm, the spherical particle diameters of acquisition are greater than 0 and are less than or equal to 5mm；
Towards the air-jet device of the heat transfer zone (12) jet, jet region is formed below the granulator (16), passes through control
The critical cooling rate that the jet rate of the air-jet device is made to make the cooling rate of spheric granules be greater than liquid blast furnace comes
Quickly heat exchange is realized, so that the temperature fast cooling of spheric granules is to 800 DEG C or less；
Superheater (5), evaporator (6), preheater (7) in the working chamber, the superheater (5), the evaporator
(6) and the preheater (7) be located at the air-jet device jet region lower section and be from top to bottom arranged successively, the overheat
Device (5), the evaporator (6), the preheater (7) are tubulose, and arrangement mode can be divided into fork row's arrangement, in the working chamber
Inner wall on be regularly fixed with solid cylinder, shape is the tube section shape of half of superheater, to guarantee arrangement mode
Regularity；
Gas-liquid separator (11), the gas-liquid separator (11) have entrance, liquid outlet and gas vent, the preheater
(7) with the entrance entered for cold water and for the outlet of level-one hot water discharge, the evaporator (6) has to be entered for second level hot water
Entrance and outlet for gas-liquid mixture discharge, the superheater (5) there is the entrance entered for saturated vapor and for overheating
The outlet of steam discharge, the outlet of the preheater (7) are connected to the entrance of the gas-liquid separator (11), the evaporator
(6) entrance is connected to the liquid outlet of the gas-liquid separator (11), the outlet and the gas-liquid separation of the evaporator (6)
The entrance of device (11) is connected to, and the entrance of the superheater (5) is connected to the gas vent of the gas-liquid separator (11)；
The hot air intake of heat exchanger (20), the heat exchanger (20) is connected to the hot-blast outlet (17), the heat exchanger (20)
Hot water outlet be connected to the entrance of the gas-liquid separator (11), the cold water in the heat exchanger (20) is changed with the master
The hot air heat exchange of thermal discharge forms hot water and is sent into the gas-liquid separator (11), the cold air outlet of the heat exchanger (20) with
The air-jet device connection, the hot wind that the main heat exchange device is discharged is exchanged heat to be formed with the cold water in the heat exchanger (20)
Cold wind be sent into the air-jet device.
2. the residual neat recovering system of liquid blast furnace according to claim 1, which is characterized in that
The air-jet device includes cold air air inlet pipe (18), ring pipe (4) and multiple air jet pipes (3), and the ring pipe (4) is arranged
The main heat exchange device (2) outside, the multiple air jet pipe (3) is evenly arranged around the center line of the ring pipe (4)；
The entrance of the cold air air inlet pipe (18) is connected to the cold air outlet of the heat exchanger (20), the cold air air inlet pipe (18)
Outlet be connected to the ring pipe (4), the entrance of the air jet pipe (3) is connected to the ring pipe (4), the air jet pipe
(3) outlet is protruded into the working chamber with towards the lower zone jet for being located at the granulator (16) in the working chamber.
3. the residual neat recovering system of liquid blast furnace according to claim 2, which is characterized in that
The outlet of the air jet pipe (3) tilts upward.
4. the residual neat recovering system of liquid blast furnace according to claim 1, which is characterized in that
The inner wall of the transition region (13) from top to bottom slopes inwardly；
The work chamber discharge port is connected to the heat transfer zone (12), the superheater (5), the evaporator (6) and described pre-
Hot device (7) is located in the heat transfer zone (12).
5. the residual neat recovering system of liquid blast furnace according to claim 4, which is characterized in that
The bottom of the heat transfer zone (12) is tapered, and the working chamber discharge outlet is equipped with the work chamber discharge port control for controlling its aperture
Valve (8) processed；
The outer wall of the main heat exchange device (2) wraps up insulating layer；
Protective cover is fixed on the outside of the driver (15).
6. the residual neat recovering system of liquid blast furnace according to any one of claims 1-5, which is characterized in that
The superheater (5), the evaporator (6) and the preheater (7) be round tube, elliptical tube, rhumbatron, triangle tube and
Any one of hexagonal tube.
7. the residual neat recovering system of liquid blast furnace according to any one of claims 1-5, which is characterized in that
The gas-liquid separator (11) is drum.
8. a kind of carry out waste heat recycling to liquid blast furnace using the residual neat recovering system of any of claims 1-7
Method characterized by comprising
Liquid blast furnace injects in the granulator (16) through the working chamber feed inlet (1), is driven by the driver (15)
Liquid blast furnace in the granulator (16) of rotation flies out the granulator (16) and towards the work due to the effect of centrifugal force
Make the inner wall movement of chamber, the liquid blast furnace becomes spheric granules in the process；
The spheric granules, which is encountered, to be moved downward the cold air sprayed with the air-jet device after the inner wall of the working chamber and exchanges heat, institute
It states spheric granules and cools to 800 DEG C or less, wherein make the spheric granules by controlling the jet rate of the air-jet device
Cooling rate be greater than liquid blast furnace critical cooling rate, cold air exchange heat the hot wind to be formed from the hot-blast outlet be discharged institute
State main heat exchange device (2)；
Spheric granules after cooling continues to move downward and the superheater (5), the evaporator (6) and the preheater (7)
It successively exchanges heat, the main heat exchange device (2) is discharged from the work chamber discharge port in spheric granules after cooling, wherein described pre-
Cold water in hot device (7) and the spheric granules, which exchange heat, to be formed level-one hot water and enters gas-liquid separator (11), the gas-liquid separation
The second level hot water isolated in device (11) enters the evaporator (6), second level hot water and the spherical shape in the evaporator (6)
Particle, which exchanges heat, to be formed gas-liquid mixture and enters gas-liquid separator (11), and the saturated vapor that gas-liquid separator (11) is isolated enters institute
It states superheater (5), the saturated air in the superheater (5) and the spheric granules exchange heat to form the superheated vapor discharge mistake
Hot device (5), wherein hot wind exchanges heat with cold water to form cold air and be sent into air-jet device and recycle in heat exchanger (20), heat exchanger
(20) cold water fed in absorbs heat to form hot water feeding gas-liquid separator (11).
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| CN110186287B (en) * | 2019-05-29 | 2021-02-23 | 山西八达镁业有限公司 | High-temperature slag waste heat utilization method and system |
| CN110186019B (en) * | 2019-06-12 | 2024-01-16 | 江苏联储能源科技有限公司 | Extra-high temperature liquid metallurgical slag waste heat recovery device and waste heat recovery system |
| CN112143838A (en) * | 2020-09-19 | 2020-12-29 | 杭州鸿晶自动化科技有限公司 | Dry-type slag waste heat recovery system |
| CN113551432B (en) * | 2021-07-06 | 2023-06-06 | 浙江高晟光热发电技术研究院有限公司 | Granule temperature regulating device |
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