CN108130426B - Lead-zinc slag waste heat recovery system - Google Patents
Lead-zinc slag waste heat recovery system Download PDFInfo
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- CN108130426B CN108130426B CN201810212529.8A CN201810212529A CN108130426B CN 108130426 B CN108130426 B CN 108130426B CN 201810212529 A CN201810212529 A CN 201810212529A CN 108130426 B CN108130426 B CN 108130426B
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- slag
- conveyor
- lead
- zinc
- waste heat
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- 239000002893 slag Substances 0.000 title claims abstract description 405
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 238000011084 recovery Methods 0.000 title claims abstract description 71
- 239000002918 waste heat Substances 0.000 title claims abstract description 71
- 230000007246 mechanism Effects 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 29
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- 239000011701 zinc Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 46
- 238000009826 distribution Methods 0.000 claims description 35
- 238000000926 separation method Methods 0.000 claims description 30
- 239000000428 dust Substances 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000009856 non-ferrous metallurgy Methods 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 62
- 238000000034 method Methods 0.000 description 18
- 239000002245 particle Substances 0.000 description 14
- 239000010410 layer Substances 0.000 description 12
- 238000003723 Smelting Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000006872 improvement Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000004064 recycling Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 238000007908 dry granulation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
- C22B7/04—Working-up slag
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses a lead-zinc slag waste heat recovery system, and relates to the field of lead-zinc slag treatment in nonferrous metallurgy industry. The recovery system of the present invention comprises: a fuming furnace; a conveyor on which liquid lead-zinc slag discharged from the fuming furnace falls; the outlet of the distributing device is positioned above the inlet end of the conveyor; the outlet end of the conveyor is communicated with the inlet of the slag separating mechanism, a first branch of the outlet of the slag separating mechanism is led to a stock ground, and a second branch of the outlet of the slag separating mechanism is led to the inlet of the distributor; the slag turning mechanism is used for mixing lead and zinc slag on the conveyor up and down; and the waste heat recovery mechanism is used for recovering heat from the lead-zinc slag on the conveyor. The invention aims to overcome the defect of shorter service life of the conventional lead-zinc slag heat recovery device, and provides a lead-zinc slag waste heat recovery system which prolongs the service life of the device.
Description
Technical Field
The invention relates to the field of lead-zinc slag treatment in nonferrous metallurgy industry, in particular to a lead-zinc slag waste heat recovery system.
Background
In domestic nonferrous metal lead-zinc production, lead smelting mainly adopts a water gap mountain method (SKS), and zinc smelting mainly adopts a wet zinc smelting technology. In order to improve the extraction rate of lead and zinc in the lead and zinc smelting process, lead and zinc slag is treated by a fuming furnace, and the high-temperature lead and zinc slag in China is cooled by a water quenching slag flushing mode all the time, so that the high-temperature waste heat of the lead and zinc slag cannot be effectively recycled. Meanwhile, in the lead-zinc slag treatment process, a large amount of steam is diffused, a large amount of circulating water is consumed, and the purification treatment of the slag flushing water is difficult to a certain extent.
In the past, many researchers have carried out more researches on lead-zinc smelting methods and subsequent application of lead-zinc slag, but little research on a lead-zinc slag flushing process is carried out. The temperature of the lead-zinc slag from the fuming furnace is about 1250 ℃, in the traditional treatment process, the liquid lead-zinc slag is quenched by water and is cooled and crushed into solid small particles, the water content of the lead-zinc slag obtained by final treatment is high, the lead-zinc slag is required to be subjected to certain drying treatment and then is sent to a cement plant to serve as the raw material of cement, a large amount of water resources are wasted in the process, the formed industrial wastewater is high in purification difficulty, the generated wastewater contains more heavy metal ions, the environment is greatly polluted due to improper treatment, and the treatment cost is high. And the steam generated in the slag flushing process is difficult to collect, and the steam contains heavy metals such as lead and the like, so that the environment is seriously polluted after the heavy metals are diffused, and the human health is greatly threatened. Therefore, the recovery and the utilization of the lead-zinc slag waste heat resources play a key role in saving energy sources, reducing energy consumption and reducing pollutant emission in the lead-zinc smelting industry.
Regarding the heat recovery process of slag, there are a number of related patents disclosed in the prior art, such as patent publication No.: CN 106636496A, publication date: the invention is provided with the following creative names in 2017, 05 and 10 days: a blast furnace slag dry granulation and heat recovery system and method, the heat recovery system of the application comprising: the bottom of the tank body of the heat-insulating buffer tank is provided with a slag discharging pipe, and a stopper rod is arranged in the slag discharging pipe; the granulating device comprises a granulating bin, a spraying device is arranged at the upper part in the granulating bin, a rotatable granulating turntable is arranged, a discharging chute is arranged at the bottom, and a slag particle collecting port is arranged at the tail end of the discharging chute; the heat exchange tank comprises a heat exchange tank body, wherein a cooling air inlet is arranged below the heat exchange tank body, and a hot air outlet is arranged above the heat exchange tank body. The method and the system for dry granulating and heat recovery of the blast furnace slag overcome the contradiction between the cooling speed of the blast furnace slag and the quality of the recovered waste heat, and improve the operation utilization rate and the heat recovery utilization rate of the blast furnace slag dry granulating device. Meanwhile, the treated slag particles can more easily obtain the slag particle raw materials which are rich in glass bodies and meet the requirements of cement production. However, the system for recovering heat from the blast furnace slag in this application is not suitable for recovering heat from the lead-zinc slag, the temperature of the lead-zinc slag from the fuming furnace in the prior art is about 1250 ℃, and the service life of the heat exchange tank can be reduced after the lead-zinc slag is accumulated in the heat exchange tank and used for a long time, so how to design a device for recovering heat from the lead-zinc slag with long service life is a technical problem to be solved in the prior art.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defect of shorter service life of the conventional lead-zinc slag heat recovery device, and provides a lead-zinc slag waste heat recovery system which prolongs the service life of the device.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the lead-zinc slag waste heat recovery system of the invention comprises:
a fuming furnace;
the liquid lead-zinc slag discharged from the fuming furnace falls on the conveyor;
the outlet of the distributing device is positioned above the inlet end of the conveyor;
the outlet end of the conveyor is communicated with the inlet of the slag separating mechanism, a first branch of the outlet of the slag separating mechanism is led to a stock ground, and a second branch of the outlet of the slag separating mechanism is led to the inlet of the distributor;
the slag turning mechanism is arranged between the inlet end of the conveyor and the outlet end of the conveyor and is used for up-down mixing of lead-zinc slag on the conveyor;
and the waste heat recovery mechanism is used for recovering heat from the lead-zinc slag on the conveyor.
As a further improvement of the invention, the waste heat recovery mechanism comprises a plurality of exhaust hoods which are respectively positioned below the conveyor belt of the conveyor, a plurality of through holes are arranged on the conveyor belt of the conveyor, and at least one exhaust hood which is close to the inlet end of the conveyor is communicated with the inlet of the waste heat recovery unit through an exhaust fan.
As a further improvement of the present invention, the distributor includes:
the inlet of the upper material distribution channel is communicated with the second branch of the outlet of the slag separation mechanism;
the inlet of the lower distribution channel is communicated with the outlet of the upper distribution channel, and the outlet of the lower distribution channel is positioned above the inlet end of the conveyor; the width of the inlet of the lower distribution channel is a, the width of the outlet of the lower distribution channel is b, the width of the conveyor belt is c, b is more than a, and b is more than or equal to 0.75c and less than or equal to c; baffles are respectively arranged on the left side and the right side of the conveyor belt, which are perpendicular to the length direction of the conveyor belt;
the upper end of the material distributing plate is positioned in the middle of the inlet of the lower material distributing channel, and the lower end of the material distributing plate is positioned on the inner side wall of the outlet of the lower material distributing channel; the two distributing plates are symmetrically arranged in the lower distributing channel.
As a still further improvement of the present invention, the slag separating mechanism includes:
the slag separation barrel is obliquely arranged, one end of the slag separation barrel, which is higher, is provided with an opening, the outlet end of the conveyor is communicated with one end of the slag separation barrel, which is lower, is provided with a sealing cover, and the side wall of the slag separation barrel is provided with a plurality of through holes; the slag separation cylinder is driven to rotate by a driving mechanism;
the first slag collecting box is arranged below the slag separating cylinder, the top opening of the first slag collecting box is arranged, the first slag collecting box is divided into a first slag collecting chamber and a second slag collecting chamber through a first slag separating plate, the diameter of a through hole on the side wall of the slag separating cylinder above the first slag collecting chamber is larger than that of a through hole on the side wall of the slag separating cylinder above the second slag collecting chamber, and the part of the slag separating cylinder above the first slag collecting chamber is lower than that of the slag separating cylinder above the second slag collecting chamber;
the second slag collecting box is positioned below the first slag collecting box and is arranged at the top opening of the second slag collecting box, the second slag collecting box is divided into a first slag collecting cavity and a second slag collecting cavity by a second slag dividing plate, and the height of the second slag dividing plate is adjustable; the bottom of the first slag collecting chamber is provided with a material guide pipe, an outlet of the material guide pipe is positioned above the first slag collecting cavity, and the aperture of an inlet of the material guide pipe is larger than that of an outlet of the material guide pipe; the bottom of the second slag collecting chamber and the bottom of the second slag collecting cavity are respectively led to a stock ground through channels, the bottom of the first slag collecting cavity is led to an inlet of a distributing device through channels, and a regulating valve is arranged on the channel communicated with the bottom of the first slag collecting cavity.
As a further improvement of the invention, the slag turning mechanism comprises a first slag turning roller and a second slag turning roller which are arranged in parallel, the first slag turning roller and the second slag turning roller are positioned above the conveyor belt between the inlet end of the conveyor and the outlet end of the conveyor, the first slag turning roller and the second slag turning roller are respectively driven to rotate by a motor, and a plurality of protruding parts are arranged on the outer surfaces of the first slag turning roller and the second slag turning roller.
As a further improvement of the invention, the slag turning mechanism is positioned between the position of the drop point of the liquid lead-zinc slag discharged from the fuming furnace on the conveyor and the outlet end of the conveyor.
As a further improvement of the invention, the waste heat recovery unit comprises a dust removing device and a waste heat boiler which are sequentially connected, wherein the gas path outlet of the waste heat boiler is communicated with a hot air cover, and the hot air cover is arranged above the inlet end of the conveyor; the waste heat boiler is connected with a steam turbine, and the steam turbine is connected with a generator set; and a circulating waterway is arranged in the waste heat boiler.
As a further development of the invention, at least one suction hood near the outlet end of the conveyor communicates with the inlet of the dust separator via a suction fan, the outlet of the dust separator communicating with said hot air hood.
The invention relates to a lead-zinc slag waste heat recovery method, which comprises the following steps:
s1: preparing a lead-zinc slag waste heat recovery system;
s2: continuously conveying solid lead zinc slag to the inlet end of the conveyor through a distributing device;
s3: controlling liquid lead zinc slag to flow from the fuming furnace to the conveyor;
s4: solidifying the liquid lead-zinc slag into solid lead-zinc slag, and then mixing the solid lead-zinc slag with the solid lead-zinc slag on the lower layer of the solid lead-zinc slag through a slag turning mechanism;
s5: starting an exhaust fan, and enabling air to flow into an exhaust fan cover below a conveyor belt from the upper side of the conveyor belt, wherein hot air generated by heat exchange flows into a waste heat recovery unit for recycling;
s6: the solid lead-zinc slag flows from the outlet end of the conveyor to the slag separating mechanism, one part of the solid lead-zinc slag in the slag separating mechanism returns to the distributing device, and the other part of the solid lead-zinc slag is discharged into a material yard.
As a further improvement of the invention, the rotation directions of the first slag turning roller and the second slag turning roller in the slag turning mechanism are opposite, and the rotation direction of the slag turning roller close to the inlet end of the conveyor is along the transmission direction of the conveyor belt.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) The lead-zinc slag waste heat recovery system adopts a method of mixing hot slag and cold slag, is beneficial to rapid heat exchange between slag and cooling air, improves heat exchange efficiency, ensures better cooling of lead-zinc slag, can avoid the problems of water pollution and white steam pollution of solid slag, can recover waste heat resources in high-temperature lead-zinc slag, greatly improves the waste heat utilization rate in the lead-zinc slag treatment process, and is beneficial to energy conservation and emission reduction of lead-zinc smelting enterprises.
(2) According to the invention, the distributor is arranged, so that the solid lead-zinc slag discharged from the outlet of the slag separating mechanism can be uniformly dispersed in the width direction of the conveyor belt, on one hand, the heat recovery efficiency of the lead-zinc slag is improved, on the other hand, the solid lead-zinc slag is uniformly dispersed on the conveyor belt, and a protective layer is formed on the conveyor belt, so that the high-temperature liquid lead-zinc slag discharged from the fuming furnace is prevented from directly contacting the conveyor belt, the conveyor belt is protected, and the service life of the lead-zinc slag waste heat recovery system is prolonged.
(3) According to the invention, on one hand, the material dynamic balance of the solid lead-zinc slag on the whole conveyor can be ensured through the slag separating mechanism, and the liquid lead-zinc slag is ensured to always fall on the conveyor paved with the solid lead-zinc slag layer; on the other hand, the large-particle solid lead-zinc slag can be screened out and laid on the conveyor, so that good air permeability of a solid lead-zinc slag layer on the conveyor is ensured, the circulating recovery of hot air is facilitated, and the heat recovery efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a lead-zinc slag waste heat recovery system in an embodiment;
FIG. 2 is a schematic diagram of a distributor according to an embodiment;
FIG. 3 is a schematic structural view of a slag separating mechanism in an embodiment;
FIG. 4 is a schematic structural view of a slag turning mechanism in an embodiment;
fig. 5 is a flow chart of a lead-zinc slag waste heat recovery method in an embodiment.
Reference numerals in the schematic drawings illustrate: 1. a fuming furnace; 2. a distributing device; 201. a material loading channel; 202. a lower distribution channel; 203. a material dividing plate; 3. a hot air hood; 4. a slag turning mechanism; 401. a first slag turning roller; 402. a second slag turning roller; 5. a slag separating mechanism; 501. a slag separating cylinder; 502. a first slag collection box; 5021. a first slag collection chamber; 5022. a second slag collection chamber; 503. a first slag separation plate; 504. a material guiding pipe; 505. a second slag collection box; 5051. the first slag collecting cavity; 5052. a second slag collection cavity; 506. a second slag separation plate; 507. a regulating valve; 6. a stock yard; 7. a conveyor; 8. a dust remover; 9. an air draft fan cover; 10. an exhaust fan; 11. liquid lead zinc slag; 12. solid lead zinc slag; 13. a dust removal device; 14. a waste heat boiler; 15. a steam turbine; 16. a generator set; 17. and (5) a circulating waterway.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.
Example 1
1-4, the lead-zinc slag waste heat recovery system of the embodiment comprises: a fuming furnace 1; conveyor 7 (in this embodiment, conveyor 7 is a chain-plate conveyor), and liquid lead-zinc slag 11 discharged from fuming furnace 1 falls on conveyor 7; a distributor 2, wherein an outlet of the distributor 2 is positioned above an inlet end of the conveyor 7; the outlet end of the conveyor 7 is communicated with the inlet of the slag separating mechanism 5, a first branch of the outlet of the slag separating mechanism 5 is led to a stock ground 6, and a second branch of the outlet of the slag separating mechanism 5 is led to the inlet of the distributing device 2; the slag turning mechanism 4 is arranged between the inlet end of the conveyor 7 and the outlet end of the conveyor 7, and the slag turning mechanism 4 is used for mixing lead and zinc slag on the conveyor 7 up and down; and a waste heat recovery mechanism, which recovers heat from the lead-zinc slag on the conveyor 7. The waste heat recovery unit comprises a dust removal device 13 and a waste heat boiler 14 which are sequentially connected, the air path outlet of the waste heat boiler 14 is communicated with the hot air cover 3, the hot air cover 3 is arranged above the inlet end of the conveyor 7 (namely, waste heat air generated by the waste heat boiler 14 is discharged from the hot air cover 3 and is reused as air to be subjected to heat exchange for recycling, so that the utilization efficiency of heat is improved); the waste heat boiler 14 is connected with a steam turbine 15, and the steam turbine 15 is connected with a generator set 16; a circulating water path 17 is arranged in the waste heat boiler 14.
Example 2
Referring to fig. 1-4, the lead-zinc slag waste heat recovery system of this embodiment has a structure substantially the same as that of embodiment 1, and further:
in this embodiment, the waste heat recovery mechanism further includes a plurality of exhaust hoods 9 located below the conveyer belt of the conveyer 7, and a plurality of through holes are formed in the conveyer belt of the conveyer 7 (in this embodiment, the aperture of each through hole in the conveyer belt is smaller than the particle size of the cooled solid lead-zinc slag 12, so that the solid lead-zinc slag 12 is prevented from leaking down from the conveyer belt, air is ensured to pass through the conveyer belt, heat on the lead-zinc slag is effectively recovered), and at least one exhaust hood 9 near the inlet end of the conveyer 7 is communicated with the inlet of the waste heat recovery unit through an exhaust fan 10. In this embodiment, the heat recovery is performed by sucking hot air by the exhaust fan 10, so that dust pollution is avoided, and air circulation is facilitated.
Example 3
Referring to fig. 1-4, the lead-zinc slag waste heat recovery system of this embodiment has a structure substantially the same as that of embodiment 2, and further:
in this embodiment, the distributor 2 includes: an upper distribution channel 201, wherein an inlet of the upper distribution channel 201 is communicated with a second branch of an outlet of the slag separation mechanism 5; a lower distribution channel 202, wherein an inlet of the lower distribution channel 202 is communicated with an outlet of the upper distribution channel 201, and an outlet of the lower distribution channel 202 is positioned above an inlet end of the conveyor 7; the width of the inlet of the lower distribution channel 202 is a, the width of the outlet of the lower distribution channel 202 is b, the width of the conveying belt of the conveyor 7 is c, b is more than a, and b is more than or equal to 0.75c and less than or equal to c; baffles are respectively arranged at the left side and the right side of the conveyor 7, which are perpendicular to the length direction of the conveyor 7; (in the embodiment, the baffles are respectively arranged at the left side and the right side of the conveyor 7 and can prevent the solid lead zinc slag 12 from falling off the conveyor 7); the material distributing plate 203 is provided with a plurality of through holes, the material distributing plate 203 is obliquely arranged, the upper end of the material distributing plate 203 is positioned in the middle of the inlet of the lower material distributing channel 202, and the lower end of the material distributing plate 203 is positioned on the inner side wall of the outlet of the lower material distributing channel 202; the two distributing plates 203 are symmetrically arranged in the lower distributing channel 202, namely, the two distributing plates 203 are arranged in the lower distributing channel 202 in an inverted V shape and are fixedly arranged through supporting pieces. In the embodiment, the solid lead-zinc slag 12 enters the upper material distribution channel 201 from the second branch of the outlet of the slag separation mechanism 5, then falls onto two material separation plates 203 in the lower material distribution channel 202, rolls along the inclined material separation plates 203 towards the inner side wall direction of the lower material distribution channel 202, and continuously falls onto the conveyor 7 conveyor belt at the corresponding position through the through holes arranged on the material separation plates 203 in the rolling process, so that the solid lead-zinc slag 12 is uniformly distributed in the width direction of the conveyor 7 conveyor belt; in this embodiment, the setting of the distributing device 2 makes the solid lead-zinc slag 12 discharged from the outlet of the slag separating mechanism 5 be uniformly dispersed in the width direction of the conveyor 7 conveyor belt, on the one hand, the efficiency of heat recovery of the lead-zinc slag is improved, on the other hand, the solid lead-zinc slag 12 is uniformly dispersed on the conveyor 7 conveyor belt, and a protective layer is formed on the conveyor 7 conveyor belt, so that the liquid lead-zinc slag 11 discharged from the fuming furnace 1 at about 1250 ℃ is prevented from directly contacting the conveyor 7 conveyor belt, thereby protecting the conveyor 7 conveyor belt and prolonging the service life of the lead-zinc slag waste heat recovery system of this embodiment. In the prior art, the high-temperature liquid lead-zinc slag discharged from the fuming furnace 1 is directly cooled, so that a large amount of heat is wasted, and the heat recovery efficiency is low; or some equipment or devices are used for directly bearing the high-temperature liquid lead-zinc slag discharged from the fuming furnace 1 and then carrying out heat recovery, but the equipment or devices for directly bearing the liquid lead-zinc slag are often damaged after being used for a period of time because the tapping temperature of the liquid lead-zinc slag is about 1250 ℃, so that the service life of a lead-zinc slag heat recovery system is severely limited; in the application, the relatively cooled solid lead-zinc slag 12 is directly used for directly bearing the liquid lead-zinc slag 11, so that equipment is protected, meanwhile, the solid lead-zinc slag 12 is circularly generated by the continuously cooled liquid lead-zinc slag 11 on one hand, and on the other hand, the low-temperature solid lead-zinc slag 12 at the lower layer and the high-temperature solid lead-zinc slag 12 solidified by the liquid lead-zinc slag 11 at the upper layer are mutually mixed and subjected to heat exchange by the mixing of the slag turning mechanism 4, so that all the solid lead-zinc slag 12 also maintain a certain temperature, the effective heat exchange surface area of air and the lead-zinc slag is enlarged, and the heat recovery efficiency is remarkably improved. The width of the inlet of the lower distribution channel 202 is a, the width of the outlet of the lower distribution channel 202 is b, the width of the conveying belt of the conveyor 7 is c, b is greater than a and 0.75c is less than or equal to b and less than or equal to c, so that the solid lead-zinc slag 12 entering from the inlet of the upper distribution channel 201 can be uniformly dispersed on the conveying belt of the conveyor 7 (the solid lead-zinc slag 12 has a separation speed in the corresponding direction of the inner side wall of the lower distribution channel 202 when rolling on the obliquely arranged material separation plate 203, and therefore, the solid lead-zinc slag 12 can be distributed in the direction of the conveying belt width of the conveyor 7 by setting 0.75c is less than or equal to b.
Example 4
Referring to fig. 1-4, the lead-zinc slag waste heat recovery system of this embodiment has a structure substantially the same as that of embodiment 3, and further:
in the embodiment, the slag separating mechanism 5 includes: the slag separation cylinder 501 is obliquely arranged, one end of the slag separation cylinder 501, which is higher, is provided with an opening, the outlet end of the conveyor 7 is communicated with one end of the slag separation cylinder 501, which is lower, is provided with a sealing cover, and the side wall of the slag separation cylinder 501 is provided with a plurality of through holes; the slag separation cylinder 501 is driven to rotate by a driving mechanism; the first slag collecting box 502 is arranged below the slag separating cylinder 501, the top opening of the first slag collecting box 502 is arranged, the first slag collecting box 502 is divided into a first slag collecting chamber 5021 and a second slag collecting chamber 5022 by a first slag separating plate 503, the diameter of a through hole on the side wall of the slag separating cylinder 501 above the first slag collecting chamber 5021 is larger than that of a through hole on the side wall of the slag separating cylinder 501 above the second slag collecting chamber 5022, and the part of the slag separating cylinder 501 above the first slag collecting chamber 5021 is lower than that of the slag separating cylinder 501 above the second slag collecting chamber 5022; the second slag collecting box 505 is positioned below the first slag collecting box 502, the top opening of the second slag collecting box 505 is arranged, the second slag collecting box 505 is divided into a first slag collecting cavity 5051 and a second slag collecting cavity 5052 by a second slag separating plate 506, and the height of the second slag separating plate 506 is adjustable; the bottom of the first slag collecting chamber 5021 is provided with a material guide pipe 504, the outlet of the material guide pipe 504 is positioned above the first slag collecting cavity 5051, and the aperture of the inlet of the material guide pipe 504 is larger than that of the outlet of the material guide pipe 504, so that the solid lead zinc slag 12 can effectively flow into the first slag collecting cavity 5051; the bottom of the second slag collecting chamber 5022 and the bottom of the second slag collecting cavity 5052 are respectively led to the stock ground 6 through channels, the bottom of the first slag collecting cavity 5051 is led to the inlet of the distributor 2 through channels, and a regulating valve 507 is arranged on the channel communicated with the bottom of the first slag collecting cavity 5051. In this embodiment, the solid lead-zinc slag 12 continuously discharged from the outlet end of the conveyor 7 falls into the higher end of the slag separating barrel 501, and as the slag separating barrel 501 is driven to rotate by the driving mechanism, the solid lead-zinc slag 12 rolls down along the inner wall of the slag separating barrel 501 towards the lower end of the slag separating barrel 501, and the diameter of the through hole on the side wall of the slag separating barrel 501 above the first slag collecting chamber 5021 is larger than that of the through hole on the side wall of the slag separating barrel 501 above the second slag collecting chamber 5022, so that the solid lead-zinc slag 12 with large particles automatically falls into the first slag collecting chamber 5021, the solid lead-zinc slag 12 with small particles automatically falls into the second slag collecting chamber 5022, and the solid lead-zinc slag 12 with large particles falling into the first slag collecting chamber 5021 falls into the first slag collecting chamber 5051 through the material guide pipe 504 and then is led to the inlet of the distributor 2 through the channel; when the unit time supply amount of the large-particle solid lead zinc slag 12 entering the distributor 2 needs to be regulated, the opening degree of the regulating valve 507 can be changed; when the large-particle solid lead-zinc slag 12 in the first slag collection cavity 5051 is temporarily excessively supplied, the excessive large-particle solid lead-zinc slag 12 automatically overflows the second slag separation plate 506 and falls into the second slag collection cavity 5052 (the excessive supply critical value can be adjusted by changing the height of the second slag separation plate 506), and the solid lead-zinc slag 12 in the second slag collection cavity 5052 and the second slag collection chamber 5022 is directly led to the material yard 6 through the channel. In actual use, the liquid lead-zinc slag 11 continuously discharged from the fuming furnace 1 falls on the conveyor 7, in the embodiment, the slag separating mechanism 5 can ensure the dynamic balance of the materials of the solid lead-zinc slag 12 on the whole conveyor 7, ensure that the liquid lead-zinc slag 11 always falls on the conveyor 7 paved with the solid lead-zinc slag 12 layer, namely, the amount of the solid lead-zinc slag 12 on the conveyor 7 is neither increased nor reduced along with the heat recovery process, and maintain the state of material balance; on the other hand, the large-particle solid lead-zinc slag 12 can be screened out and laid on the conveyor 7, so that good air permeability of the solid lead-zinc slag 12 layer on the conveyor 7 is ensured, the circulation recovery of hot air is facilitated, and the heat recovery efficiency is improved.
Example 5
Referring to fig. 1-4, the lead-zinc slag waste heat recovery system of this embodiment has a structure substantially the same as that of embodiment 4, and further:
in this embodiment, the slag turning mechanism 4 includes a first slag turning roller 401 and a second slag turning roller 402 that are parallel to each other, the first slag turning roller 401 and the second slag turning roller 402 are located above the conveyor belt between the inlet end of the conveyor 7 and the outlet end of the conveyor 7, the first slag turning roller 401 and the second slag turning roller 402 are driven to rotate by a motor respectively, and a plurality of protruding portions are disposed on the outer surfaces of the first slag turning roller 401 and the second slag turning roller 402. When the device is used, the first slag turning roller 401 and the second slag turning roller 402 are driven by corresponding motors to rotate in opposite directions, namely, the slag turning rollers of the first slag turning roller 401 and the second slag turning roller 402 are opposite in rotation direction and close to the inlet end of the conveyor 7, turn along the transmission direction of the conveyor 7, the protruding parts on the outer surface of the slag turning rollers play a good slag turning role, so that the low-temperature solid lead-zinc slag 12 on the lower layer and the high-temperature solid lead-zinc slag 12 on the upper layer, which are solidified by the liquid lead-zinc slag 11, are mutually mixed, and the heat of the liquid lead-zinc slag 11 just discharged from the fuming furnace 1 is uniformly dispersed on all the solid lead-zinc slag 12, the heat exchange efficiency is improved, and the hot air temperature of a waste heat recovery unit is improved.
Example 6
Referring to fig. 1-4, the lead-zinc slag waste heat recovery system of this embodiment has a structure substantially the same as that of embodiment 5, and further:
in the embodiment, at least one exhaust fan cover 9 near the outlet end of the conveyor 7 is communicated with the inlet of the dust remover 8 through an exhaust fan 10, and the outlet of the dust remover 8 is communicated with the hot air cover 3. Because the temperature of the lead-zinc slag close to the outlet end of the conveyor 7 is relatively low, the temperature of the hot air recovered at the position is relatively low, and the hot air is not suitable for being directly introduced into the waste heat boiler 14 for power generation, the generated hot air can be communicated with the hot air cover 3 after dust removal and is reused as the air to be subjected to heat exchange, and the heat utilization efficiency is improved.
Example 7
Referring to fig. 1-4, the lead-zinc slag waste heat recovery system of this embodiment has a structure substantially the same as that of embodiment 6, and further:
in the embodiment, the slag turning mechanism 4 is located between the position of the drop point of the liquid lead-zinc slag 11 discharged from the fuming furnace 1 and the outlet end of the conveyor 7, after the liquid lead-zinc slag 11 drops on the conveyor 7 and is solidified into high-temperature solid lead-zinc slag 12, the high-temperature solid lead-zinc slag 12 just solidified by the liquid lead-zinc slag 11 can be effectively crushed (the caking degree of the high-temperature solid lead-zinc slag 12 is not large and is easy to crush at this time) through the slag turning mechanism 4, the subsequent recycling requirement of the lead-zinc slag is met, and on the other hand, the slag can be effectively mixed with the low-temperature solid lead-zinc slag 12 at the lower layer, and the heat recycling efficiency is improved.
Referring to fig. 5, the lead-zinc slag waste heat recovery method of the embodiment includes the following steps:
s1: preparing the lead-zinc slag waste heat recovery system;
s2: continuously conveying solid lead zinc slag 12 to the inlet end of a conveyor 7 through a distributing device 2; (before the waste heat recovery system starts to be used, a plurality of large-particle solid lead-zinc slag 12 can be placed in the first slag collecting cavity 5051 of the slag separating mechanism 5, so that a solid lead-zinc slag 12 layer can be paved on the conveyor 7 at the beginning conveniently)
S3: controlling the liquid lead zinc slag 11 to flow from the fuming furnace 1 to the conveyor 7;
s4: the liquid lead zinc slag 11 is solidified into solid lead zinc slag 12, and then is mixed with the solid lead zinc slag 12 on the lower layer through a slag turning mechanism 4;
s5: starting an exhaust fan 10, and enabling air to flow into an exhaust fan cover 9 below a conveyor 7 conveyor belt from the upper side of the conveyor 7 conveyor belt, wherein hot air generated by heat exchange flows into a waste heat recovery unit for recycling; (the air is sucked to cool the high Wen Qianxin slag, and the air is heated and collected by the exhaust fan housing 9 and then sent to the waste heat recovery unit to generate electricity;)
S6: the solid lead-zinc slag 12 flows from the outlet end of the conveyor 7 to the slag distributing mechanism 5, and one part of the solid lead-zinc slag 12 in the slag distributing mechanism 5 returns to the distributing device 2, and the other part is discharged into the material yard 6.
The rotation directions of the first slag turning roller 401 and the second slag turning roller 402 in the slag turning mechanism 4 are opposite, and the rotation direction of the slag turning roller close to the inlet end of the conveyor 7 is along the transmission direction of the conveyor belt of the conveyor 7. (corresponding to one of the first and second slag-turning rollers 401 and 402 near the inlet end of the conveyor 7, the rotation direction of which is along the transmission direction of the conveyor belt 7 so that the slag-turning mechanism 4 can effectively crush and mix the lead-zinc slag.)
According to the lead-zinc slag waste heat recovery system and method, a hot slag and cold slag mixing method is adopted, rapid heat exchange between slag and cooling air is facilitated, heat exchange efficiency is improved, good cooling of lead-zinc slag can be guaranteed, the problems of solid slag water pollution and white steam pollution can be avoided, waste heat resources in high-temperature lead-zinc slag can be recovered, waste heat utilization rate in a lead-zinc slag treatment process is greatly improved, and energy conservation and emission reduction of lead-zinc smelting enterprises are facilitated.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (7)
1. Lead-zinc slag waste heat recovery system, including fuming furnace (1), its characterized in that still includes:
a conveyor (7), wherein liquid lead-zinc slag (11) discharged from the fuming furnace (1) falls on the conveyor (7);
the outlet of the distributing device (2) is positioned above the inlet end of the conveyor (7);
the outlet end of the conveyor (7) is communicated with the inlet of the slag separating mechanism (5), a first branch of the outlet of the slag separating mechanism (5) is led to a stock ground (6), and a second branch of the outlet of the slag separating mechanism (5) is led to the inlet of the distributing device (2); the slag separation mechanism (5) comprises:
the slag separation cylinder (501) is obliquely arranged, one end of the slag separation cylinder (501) which is higher is provided with an opening, the outlet end of the conveyor (7) is communicated with one end of the slag separation cylinder (501), one end of the slag separation cylinder (501) which is lower is provided with a sealing cover, and the side wall of the slag separation cylinder (501) is provided with a plurality of through holes; the slag separation cylinder (501) is driven to rotate by a driving mechanism;
the first slag collecting box (502) is arranged below the slag separating cylinder (501) and is arranged at the top opening of the first slag collecting box (502), the first slag collecting box (502) is divided into a first slag collecting chamber (5021) and a second slag collecting chamber (5022) through a first slag separating plate (503), the diameter of a through hole on the side wall of the slag separating cylinder (501) above the first slag collecting chamber (5021) is larger than that of the slag separating cylinder (501) above the second slag collecting chamber (5022), and the part of the slag separating cylinder (501) above the first slag collecting chamber (5021) is lower than that of the slag separating cylinder (501) above the second slag collecting chamber (5022);
the second slag collecting box (505) is arranged below the first slag collecting box (502) and is arranged at the top opening of the second slag collecting box (505), the second slag collecting box (505) is divided into a first slag collecting cavity (5051) and a second slag collecting cavity (5052) by a second slag separating plate (506), and the height of the second slag separating plate (506) is adjustable; a material guide pipe (504) is arranged at the bottom of the first slag collecting chamber (5021), an outlet of the material guide pipe (504) is positioned above the first slag collecting cavity (5051), and the aperture of an inlet of the material guide pipe (504) is larger than that of an outlet of the material guide pipe (504); the bottom of the second slag collecting chamber (5022) and the bottom of the second slag collecting cavity (5052) are respectively led to a stock ground (6) through a channel, and the bottom of the first slag collecting cavity (5051) is led to an inlet of the distributing device (2) through a channel;
the slag turning mechanism (4), the slag turning mechanism (4) is arranged between the inlet end of the conveyor (7) and the outlet end of the conveyor (7), and the slag turning mechanism (4) is used for mixing lead and zinc slag on the conveyor (7) up and down;
and the waste heat recovery mechanism is used for carrying out heat recovery on lead-zinc slag on the conveyor (7), the rest of the heat recovery mechanism comprises a plurality of exhaust hoods (9) which are respectively positioned below the conveyor belt of the conveyor (7), a plurality of through holes are formed in the conveyor belt of the conveyor (7), and at least one exhaust hood (9) which is close to the inlet end of the conveyor (7) is communicated with the inlet of the waste heat recovery unit through an exhaust fan (10).
2. Lead-zinc slag waste heat recovery system according to claim 1, characterized in that the distributor (2) comprises:
an upper distribution channel (201), wherein an inlet of the upper distribution channel (201) is communicated with a second branch of an outlet of the slag separation mechanism (5);
the inlet of the lower distribution channel (202) is communicated with the outlet of the upper distribution channel (201), and the outlet of the lower distribution channel (202) is positioned above the inlet end of the conveyor (7); the width of the inlet of the lower distribution channel (202) is a, the width of the outlet of the lower distribution channel (202) is b, the width of the conveying belt of the conveyor (7) is c, b is more than a, and b is more than or equal to 0.75c and less than or equal to c; baffles are respectively arranged at the left side and the right side of a conveyor (7) conveyor belt which is perpendicular to the length direction of the conveyor (7) conveyor belt;
the material distribution plate (203) is provided with a plurality of through holes, the material distribution plate (203) is obliquely arranged, the upper end of the material distribution plate (203) is positioned in the middle of the inlet of the lower material distribution channel (202), and the lower end of the material distribution plate (203) is positioned on the inner side wall of the outlet of the lower material distribution channel (202); the two distributing plates (203) are symmetrically arranged in the lower distributing channel (202).
3. The lead-zinc slag waste heat recovery system according to claim 1, wherein a regulating valve (507) is arranged on a channel of which the inlet of the distributor (2) is communicated with the bottom of the first slag collecting cavity (5051).
4. The lead-zinc slag waste heat recovery system according to claim 1, wherein the slag turning mechanism (4) comprises a first slag turning roller (401) and a second slag turning roller (402) which are arranged in parallel, the first slag turning roller (401) and the second slag turning roller (402) are located above a conveying belt between an inlet end of the conveyor (7) and an outlet end of the conveyor (7), the first slag turning roller (401) and the second slag turning roller (402) are respectively driven to rotate by a motor, and a plurality of protruding parts are arranged on the outer surfaces of the first slag turning roller (401) and the second slag turning roller (402).
5. The lead-zinc slag waste heat recovery system as claimed in claim 4, wherein the slag turning mechanism (4) is positioned between a drop point position of the liquid lead-zinc slag (11) discharged from the fuming furnace (1) on the conveyor (7) and an outlet end of the conveyor (7).
6. Lead-zinc slag waste heat recovery system according to any one of claims 1-5, characterized in that the waste heat recovery unit comprises a dust removal device (13) and a waste heat boiler (14) which are connected in sequence, the gas path outlet of the waste heat boiler (14) is communicated with a hot air hood (3), and the hot air hood (3) is arranged above the inlet end of the conveyor (7); the waste heat boiler (14) is connected with a steam turbine (15), and the steam turbine (15) is connected with a generator set (16); a circulating waterway (17) is arranged in the waste heat boiler (14).
7. Lead-zinc slag waste heat recovery system according to claim 6, characterized in that at least one suction hood (9) near the outlet end of the conveyor (7) communicates with the inlet of the dust separator (8) through a suction fan (10), the outlet of the dust separator (8) communicating with the hot air hood (3).
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| CN109182625A (en) * | 2018-08-27 | 2019-01-11 | 浙江哈斯科节能技术有限公司 | A method of hot melt steel slag dry method cooling system and waste heat recycle |
| CN109182628A (en) * | 2018-08-27 | 2019-01-11 | 浙江哈斯科节能技术有限公司 | A kind of cooling equipment of hot melt steel slag dry method |
| CN113617485B (en) * | 2021-08-11 | 2022-12-02 | 安徽工业大学 | Cold and hot two blast furnace liquid slag cutting breaker that mix |
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