CN114854932B - Scraper type hot direct reduced iron conveying device and method - Google Patents
Scraper type hot direct reduced iron conveying device and method Download PDFInfo
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- CN114854932B CN114854932B CN202210605892.2A CN202210605892A CN114854932B CN 114854932 B CN114854932 B CN 114854932B CN 202210605892 A CN202210605892 A CN 202210605892A CN 114854932 B CN114854932 B CN 114854932B
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- reduced iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003860 storage Methods 0.000 claims abstract description 67
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000003723 Smelting Methods 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims description 26
- 239000007789 gas Substances 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 11
- 238000005265 energy consumption Methods 0.000 description 8
- 230000005484 gravity Effects 0.000 description 7
- 238000009628 steelmaking Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 239000000956 alloy Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000009194 climbing Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000005272 metallurgy Methods 0.000 description 3
- 239000002114 nanocomposite Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009845 electric arc furnace steelmaking Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Charging Or Discharging (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The application relates to a scraper type hot direct reduced iron conveying device and a method, wherein the device comprises a hot direct reduced iron storage tank, a scraper type hot conveying device and a high-level bin system; the hot direct reduced iron storage tank is arranged below the shaft furnace and is used for hermetically storing and metering hot direct reduced iron output from an outlet at the bottom of the shaft furnace in a heat-preserving manner; the scraper hot feeding device comprises a hot feeding groove structure, a first end of the hot feeding groove structure can be communicated with an outlet of the hot direct reduced iron storage tank, a plurality of scrapers capable of moving along the hot feeding groove structure are arranged at the bottom of the hot feeding groove structure, and each scraper runs along the hot feeding groove structure to convey the hot direct reduced iron to the electric furnace; the high-level bin system is positioned above the scraper hot feeding device and is used for feeding smelting materials into the hot feeding groove structure. The application realizes DRI hot feeding and hot charging between the shaft furnace and the electric furnace in a simple and reliable mode, can adapt to different engineering application environments, reduces engineering investment, equipment failure rate and electric furnace ton steel smelting electricity consumption, and improves production efficiency.
Description
Technical Field
The application relates to the technical field of steelmaking, in particular to a scraper type hot direct reduced iron conveying device and method.
Background
At present, the hydrogen metallurgy mainly reduces iron ore in a gas-based shaft furnace through mixed gas of hydrogen and CO to obtain direct reduced iron (Direct Reduced Iron, DRI for short) which is used as a raw material for the electric arc furnace steelmaking of the next working procedure.
The manner of entering DRI into the electric arc furnace steelmaking in the next working procedure is cold state and hot state.
When cold direct reduced iron is used as the raw material of the electric furnace, the continuous feeding of DRI can be realized by adopting a conventional belt conveyor and a nitrogen sealing bin, and the equipment is simple and reliable, and the production is stable and smooth. But the cold direct reduced iron is used as a raw material for steelmaking, the energy consumption of the electric furnace is too high, and the production cost of the electric furnace steelmaking is increased.
The hot DRI is used as the raw material for electric furnace steelmaking, and the direct reduced iron at 600 ℃ brings certain physical heat to the electric furnace, so that the electric consumption and the smelting time for electric furnace steelmaking can be greatly reduced. Meanwhile, after the direct hot charging furnace for the hot direct reduced iron is adopted, the energy and materials for cooling the hot direct reduced iron at the rear part of the direct reduction process can be reduced. The electric energy can be saved by about 25 DEG/t steel when the temperature of DRI is increased by 100 ℃, the electric energy can be saved by 150 DEG/t steel when the temperature is increased by 600 ℃ compared with the cold charge, and the cost of steel per ton can be saved by 90 yuan when accounting for 0.6 yuan/DEG.
Therefore, the thermal state storage and transportation of the direct reduced iron between the hydrogen metallurgy process and the electric furnace process are realized, and the method has important significance for energy conservation and consumption reduction of a low-carbon steelmaking process route of the hydrogen metallurgy and the electric arc furnace.
However, the hot (about 600 ℃) direct reduced iron needs to be transported by adopting high-temperature resistant equipment in the process of being sent into a steel-making workshop, and meanwhile, the contact with air must be avoided, otherwise, the problem of secondary oxidation is easy to occur.
The current DRI hot charging electric furnace technology mainly comprises three technologies of gravity direct feeding, chain bucket transferring and pneumatic conveying.
The pneumatic conveying method can realize the hot conveying and hot charging of the direct reduced iron, but the investment and the operation cost are large. Disadvantages of pneumatic transport: (1) the power consumption is large; (2) equipment wear is severe; (3) The conveyed materials are limited by the process, so that wet materials which are easy to bond and fragile cannot be conveyed; (4) Because pneumatic conveying needs to be subjected to three bed states, and the conveying is carried out by a continuous fluidized bed, the flow rate of the materials is not easy to control.
Gravity feed systems, also called thermal connection systems, are designed for the conditions of the shaft furnace and the electric furnace. The defects are that: the discharge hole of the direct reduced iron is higher than the feed hole of the electric furnace, so that the foundation height of the shaft furnace is greatly increased, and the engineering investment and the construction difficulty are increased. Meanwhile, the method requires the shaft furnace to be closely arranged to the electric furnace, and limits the process arrangement of the electric furnace to a certain extent.
The prior art has a heat-resistant container tank truck conveying system. But this system requires the use of a slat conveyor to achieve lateral movement of the hot DRI.
In the prior art, an apron bucket type conveying system is a basket protection conveying system. Any charging basket is made of refractory materials and is specially designed for conveying thermal materials. The bottom of the bucket is provided with an integrated beam. The frequency controlled motor enables the transport speed to be matched to the varying transport capacity. In addition, the drive or bucket capacity height monitoring system is part of the apparatus. The technology has complex structure, high engineering investment, high equipment failure rate and high maintenance cost, and is not beneficial to popularization and use.
In the prior art, a chain bucket type hot direct reduced iron conveyor (CN 102161423B) can be used for conveying hot direct reduced iron in theory, but the hot direct reduced iron is a high-temperature material, the temperature resistance of a conventional conveying system can only reach about 250 ℃, the tapping temperature of the hot direct reduced iron is generally about 600-850 ℃, and the problem of hopper thermal deformation failure exists; the chain system vibration problem exists in the chain wheel form and the hopper form, and the mass ratio of the material conveying hopper, the material and the chain links is larger, so that the generated inertia force is larger, and the impact of the chain wheel is larger. The impact caused by the polygonal effect is not neglected because of the longer conveying distance and heavier equipment of the steel combined enterprises.
Therefore, the inventor provides a scraper type hot direct reduced iron conveying device and a scraper type hot direct reduced iron conveying method by virtue of experience and practice of related industries for many years so as to overcome the defects of the prior art.
Disclosure of Invention
The application aims to provide a scraper type hot direct reduced iron conveying device and a scraper type hot direct reduced iron conveying method, which realize DRI hot feeding hot charging between a shaft furnace and an electric furnace in a simple and reliable mode, can adapt to different engineering application environments, greatly simplify equipment structures compared with other schemes such as a skirt plate bucket type and the like, reduce engineering investment, equipment failure rate and maintenance cost, and improve production efficiency by smelting ton steel of the electric furnace.
The application aims to realize that the scraper type hot direct reduced iron conveying device comprises a hot direct reduced iron storage tank, a scraper type hot conveying device and a high-level bin system; the hot direct reduced iron storage tank is arranged below the shaft furnace and is used for hermetically storing and metering hot direct reduced iron output from an outlet at the bottom of the shaft furnace in a heat-preserving manner; the scraper hot feeding device is arranged below the hot direct reduced iron storage tank and comprises a hot feeding groove structure, a first end of the hot feeding groove structure can be communicated with an outlet of the hot direct reduced iron storage tank, the second end of the hot feeding groove structure is provided with a discharge hole which can be communicated with the electric furnace, the bottom of the hot feeding groove structure is provided with a plurality of scrapers which can move along the hot feeding groove structure, and each scraper runs along the hot feeding groove structure to convey hot direct reduced iron to the electric furnace; the high-level bin system is located above the scraper hot feeding device and is used for feeding smelting materials into the hot feeding groove structure.
In a preferred embodiment of the present application, the scraper thermal feeding device includes a gear motor disposed at one end of the thermal feeding groove structure, the gear motor is connected to a first sprocket, a chain is disposed in the thermal feeding groove structure, the chain is sleeved on the first sprocket, each scraper is parallel and connected to the chain at intervals, and the gear motor drags the chain belt through the first sprocket to push the material in the thermal feeding groove structure to move towards the discharge port.
In a preferred embodiment of the present application, the gear motor is disposed at a second end of the hot-blast groove structure, a second sprocket is disposed at a first end of the hot-blast groove structure, the chain is sleeved on the second sprocket, and a tensioning device connected to the second sprocket is further disposed at the first end of the hot-blast groove structure.
In a preferred embodiment of the present application, the gear motor is connected to the first sprocket through a coupling.
In a preferred embodiment of the present application, a sealing cover capable of sealing the heat transfer groove structure from the top is arranged above the heat transfer groove structure, and a sealing cabin is formed between the sealing cover and the heat transfer groove structure; the top of the sealed bin is provided with a first feed inlet, and the outlet of the hot direct reduced iron storage tank is communicated with the first feed inlet.
In a preferred embodiment of the present application, the hot feed trough structure includes an upper trough and a lower trough, the bottom of the upper trough and the bottom of the lower trough are respectively provided with the chains, and a plurality of scrapers are arranged on each chain in parallel and at intervals.
In a preferred embodiment of the present application, a sealing gas pipe is disposed at the top of the hot blast tank structure, and the sealing gas pipe is used for blowing inert gas into the sealing bin to reduce the secondary oxidation of the hot direct reduced iron.
In a preferred embodiment of the present application, the hot runner structure includes a runner body, and a heat insulation lining is disposed in the runner body.
In a preferred embodiment of the application, the scraper is made of cast iron plate, heat-resistant and wear-resistant alloy steel or stainless steel material.
In a preferred embodiment of the application, the chain is made of heat-resistant and wear-resistant alloy steel or stainless steel material.
In a preferred embodiment of the present application, the hot direct reduced iron storage tank includes a first shell having a tank liner disposed therein; the top of the hot direct reduced iron storage tank is provided with a first valve capable of being automatically closed, the bottom of the hot direct reduced iron storage tank is provided with a second valve capable of being automatically closed, the hot direct reduced iron storage tank is communicated with a high-temperature-resistant chute through the second valve, and the bottom of the high-temperature-resistant chute is communicated with the first end of the hot feeding groove structure; the hot direct reduced iron storage tank support is arranged on a first tank body support, and a weighing device is arranged at the bottom of the first tank body support.
The application can also be realized by adopting the scraper type hot direct reduced iron conveying device, which comprises the following steps:
step a: adding the hot direct reduced iron in the shaft furnace into a hot direct reduced iron storage tank, and storing and metering the hot direct reduced iron in the hot direct reduced iron storage tank;
step b: adding the hot direct reduced iron in the hot direct reduced iron storage tank into a scraper hot conveying device;
step c: starting a scraper hot conveying device to start hot DRI conveying;
step d: and starting the high-level bin system, adding smelting materials into the scraper hot feeding device, mixing the smelting materials with hot direct reduced iron, and pushing the materials to move towards a discharge hole by each scraper to a hopper at the top of the electric furnace.
From the above, the scraper type hot direct reduced iron conveying device and method have the following beneficial effects:
according to the application, the hot direct reduced iron storage tank is arranged below the shaft furnace, and the gravity blanking of the hot direct reduced iron is utilized to realize the transfer of hot DRI, so that the lifting climbing in the traditional DRI conveying process is reduced, and the energy consumption is reduced; the hot direct reduced iron storage tank can store and meter the hot direct reduced iron output from the bottom outlet of the shaft furnace in a closed and heat-preserving manner, so that the functions of hot DRI storage, metering and closed conveying are realized, and the energy consumption in the conveying process is reduced; each scraper of the scraper hot feeding device runs along the hot feeding groove structure to push hot DRI and smelting materials to move towards the direction of the discharge hole; the application realizes DRI hot feeding and hot charging between the shaft furnace and the electric furnace in a simple and reliable mode, can adapt to different engineering application environments, greatly simplifies equipment structure compared with other schemes such as a skirt plate bucket, reduces engineering investment, equipment failure rate and maintenance cost, reduces electric furnace ton steel smelting electricity consumption (-125 kWh/t) and improves production efficiency.
Drawings
The following drawings are only for purposes of illustration and explanation of the present application and are not intended to limit the scope of the application.
Wherein:
fig. 1: the scraper type hot direct reduced iron conveying device is a schematic diagram of the scraper type hot direct reduced iron conveying device.
Fig. 2: a top view of the scraper hot-feed apparatus of the present application.
Fig. 3: an enlarged view is shown at a in fig. 2.
Fig. 4: is a cross-sectional view at B-B in FIG. 2.
In the figure:
100. a scraper type hot direct reduced iron conveying device;
1. a hot direct reduced iron storage tank; 11. a first valve; 12. a second valve; 13. high temperature resistant chute; 14. a thermal expansion joint;
2. a scraper hot-feeding device;
21. a hot feed tank structure; 211. feeding a trough; 212. discharging groove; 213. sealing the gas pipe; 214. a heat insulation tank liner;
22. a scraper;
23. a speed reducing motor;
24. a first sprocket;
25. a chain;
26. a second sprocket;
27. a tensioning device;
28. sealing cover; 281. a first feed inlet; 282. a second feed inlet;
3. a high-level stock bin system;
4. a shaft furnace;
5. an electric furnace.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present application, a specific embodiment of the present application will be described with reference to the accompanying drawings.
The specific embodiments of the application described herein are for purposes of illustration only and are not to be construed as limiting the application in any way. Given the teachings of the present application, one of ordinary skill in the related art will contemplate any possible modification based on the present application, and such should be considered to be within the scope of the present application. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 4, the present application provides a scraper type hot direct reduced iron transporting apparatus 100, comprising a hot direct reduced iron storage tank 1, a scraper type hot transporting apparatus 2, and a high-level bin system 3; the hot direct reduced iron storage tank 1 is arranged below the shaft furnace 4, and the hot direct reduced iron storage tank 1 is used for hermetically storing and metering hot direct reduced iron output from an outlet at the bottom of the shaft furnace 4 in a heat-preserving manner; the scraper hot-feeding device 2 is arranged below the hot direct reduced iron storage tank 1, the scraper hot-feeding device 2 comprises a hot-feeding groove structure 21, a first end of the hot-feeding groove structure 21 can be communicated with an outlet of the hot direct reduced iron storage tank 1, a second end of the hot-feeding groove structure 21 is provided with a discharge hole, the discharge hole can be communicated with the electric furnace 5, a plurality of scrapers 22 capable of moving along the hot-feeding groove structure are arranged at the bottom of the hot-feeding groove structure 21, and each scraper 22 runs along the hot-feeding groove structure to convey the hot direct reduced iron to the electric furnace 5; the high-level bin system 3 is positioned above the scraper hot feeding device 2, and the high-level bin system 3 is used for feeding smelting materials (slag materials, alloy and other materials for an electric furnace) into the hot feeding groove structure 21.
The hot direct reduced iron storage tank 1 is arranged below the shaft furnace 4, hot direct reduced iron (hot DRI, 500-800 ℃) which is reduced by the shaft furnace (shaft furnace reactor) enters the hot direct reduced iron storage tank 1 under the action of gravity, the hot direct reduced iron storage tank 1 has the functions of sealing, heat preservation and weighing, when the DRI needs to be added into a downstream electric furnace, the hot DRI falls into the scraper hot feeding device 2 from the hot direct reduced iron storage tank 1, and the scraper hot feeding device 2 conveys the hot DRI into a charging hopper (high-temperature resistant charging hopper) of the DRI at the top of the electric furnace.
In the scraper hot feed apparatus 2, each scraper 22 can run along the hot feed trough structure to push the hot DRI and the smelting materials (slag materials for electric furnaces, alloy materials and the like) to move towards the discharge port direction and finally to be conveyed to the electric furnace 5.
The scraper type hot direct reduced iron conveying device 100 can be used alone or in combination to adapt to different application scenes.
In the scraper type hot direct reduced iron conveying device, the hot direct reduced iron storage tank is arranged below the shaft furnace, and the gravity blanking of the hot direct reduced iron is utilized to realize the transportation of hot DRI, so that the climbing is promoted in the traditional DRI conveying process, and the energy consumption is reduced; the hot direct reduced iron storage tank can store and meter the hot direct reduced iron output from the bottom outlet of the shaft furnace in a closed and heat-preserving manner, so that the functions of hot DRI storage, metering and closed conveying are realized, and the energy consumption in the conveying process is reduced; each scraper of the scraper hot feeding device runs along the hot feeding groove structure to push hot DRI and smelting materials to move towards the direction of the discharge hole; the application realizes DRI hot feeding and hot charging between the shaft furnace and the electric furnace in a simple and reliable mode, can adapt to different engineering application environments, greatly simplifies equipment structure compared with other schemes such as a skirt plate bucket, reduces engineering investment, equipment failure rate and maintenance cost, reduces electric furnace ton steel smelting electricity consumption (-125 kWh/t) and improves production efficiency.
Further, as shown in fig. 1 and 2, the scraper hot-conveying device 2 comprises a gear motor 23 arranged at one end of the hot-conveying groove structure 21, a first sprocket 24 is connected to the gear motor 23, a chain 25 is arranged in the hot-conveying groove structure 21, the chain 25 is sleeved on the first sprocket 24, the scrapers 22 are parallel and connected to the chain 25 at intervals, and the gear motor 23 drags the chain 25 through the first sprocket 24 to drive the scrapers 22 to push the materials in the hot-conveying groove structure 21 to move towards the discharge hole.
Further, as shown in fig. 1 and 2, in an embodiment of the present application, the gear motor 23 is disposed at a second end (head) of the hot runner structure, the second sprocket 26 is disposed at a first end (tail) of the hot runner structure, the chain 25 is sleeved on the second sprocket 26, and the tensioning device 27 connected to the second sprocket 26 is further disposed at the first end of the hot runner structure.
Further, the gear motor 23 is coupled to the first sprocket 24 through a coupling. The speed reducing motor 23 controls the running speed of the chain, namely the feeding speed of the scraper hot-feeding device 2 in a variable frequency mode.
Further, as shown in fig. 1 and 2, a sealing cover 28 capable of sealing the hot-blast groove structure from the top is arranged above the hot-blast groove structure 21, and a sealing cabin is formed between the sealing cover 28 and the hot-blast groove structure 21; the top of the sealed bin is provided with a first feeding hole 281, and the outlet of the hot direct reduced iron storage tank 1 is communicated with the first feeding hole 281. The top of the sealed bin is also provided with a second feeding hole 282, an outlet of the high-level bin system 3 is communicated with the second feeding hole 282, and the high-level bin system 3 inputs smelting materials (slag materials, alloy and other materials for an electric furnace) into the hot feeding groove structure 21 through the high-temperature-resistant chute and the second feeding hole 282.
Further, as shown in fig. 2, 3 and 4, the hot feed trough structure 21 includes an upper trough 211 and a lower trough 212, the bottoms of the upper trough 211 and the lower trough 212 are respectively provided with chains 25, and a plurality of scrapers 22 are arranged on each chain 25 in parallel and at intervals. The chain 25 in the upper trough 211, the flight 22, runs with the DRI, after it has reached the discharge port, the DRI falls into the electric furnace, and the flight 22 returns from the lower trough 212 to the first end (feed end) to complete the cyclic reciprocation of the flight 22.
Further, as shown in fig. 4, a sealing gas pipe 213 is provided at the top of the hot runner structure 21, and the sealing gas pipe 213 is used to blow an inert gas (mostly nitrogen) into the seal bin to reduce the secondary oxidation of the hot direct reduced iron.
Further, as shown in fig. 4, the hot runner structure 21 includes a runner body in which a heat insulation lining 214 is provided. In one embodiment of the present application, the hot runner assembly 21 is fabricated from a combination of inner heat resistant stainless steel + nanocomposite refractory insulation lining 214+ mild steel plate (the runner bucket body) to withstand the high temperatures of 500-800 ℃ of hot DRI while reducing heat dissipation.
Further, the scraper 22 is made of cast iron plate, heat-resistant and wear-resistant alloy steel or stainless steel material to withstand the high temperature of 500-800 ℃ of hot DRI.
Further, the chain 25 is made of heat-resistant and wear-resistant alloy steel or stainless steel material to withstand the high temperature of 500-800 ℃ of hot DRI.
Further, the hot direct reduced iron storage tank 1 comprises a first tank shell (steel shell), wherein a tank lining is arranged in the first tank shell, and the tank lining is a nano composite high-temperature-resistant heat insulation lining so as to bear the high temperature of 500-800 ℃ of hot DRI and reduce heat dissipation; the top of the hot direct reduction iron storage tank is provided with a first valve 11 capable of being automatically closed, the bottom of the hot direct reduction iron storage tank is provided with a second valve 12 capable of being automatically closed, the hot direct reduction iron storage tank is communicated with a high-temperature-resistant chute 13 through the second valve 12, and the bottom of the high-temperature-resistant chute 13 is communicated with the first end of a hot feeding groove structure 21; the hot direct reduced iron storage tank support is arranged on a first tank support, and a weighing device is arranged at the bottom of the first tank support. The hot direct reduced iron storage tank 1 is arranged below the shaft furnace, a tank lining is arranged inside the hot direct reduced iron storage tank, and a first valve and a second valve which can be automatically closed are respectively arranged at the top and the bottom of the hot direct reduced iron storage tank, so that the functions of feeding, discharging and buffering storage of hot DRI are realized.
The high-temperature resistant chute 13 comprises a pipe shell, a pipe lining is arranged in the pipe shell, and the pipe lining is a nano composite high-temperature resistant heat insulation lining so as to bear the high temperature of 500-800 ℃ of hot DRI and reduce heat dissipation; the top of the high-temperature-resistant chute 13 is connected with a hot direct reduced iron storage tank through a thermal expansion joint 14 so as to reduce the thermal stress of the high-temperature-resistant chute.
The application also provides a scraper type hot direct reduced iron conveying method, which adopts the scraper type hot direct reduced iron conveying device 100 and comprises the following steps:
step a: the hot direct reduced iron in the shaft furnace 4 is added into a hot direct reduced iron storage tank 1, and the hot direct reduced iron storage tank 1 stores and meters the hot direct reduced iron;
specifically, the bottom outlet of the shaft furnace 4 is communicated with the top of the hot direct reduced iron storage tank 1 through a chute, the hot DRI is gravity fed into the hot direct reduced iron storage tank 1, and the hot DRI is stored in the hot direct reduced iron storage tank 1 with sealing, heat preservation and weighing functions;
step b: the hot direct reduced iron in the hot direct reduced iron storage tank 1 is added into the scraper hot conveying device 2 through the high-temperature resistant chute 13;
when the downstream electric furnace needs to be added with DRI, a second valve 12 at the bottom of the hot direct reduced iron storage tank 1 is opened, and the hot DRI falls into the scraper hot conveying device 2 through a high-temperature resistant chute 13;
step c: starting the scraper hot-conveying device 2 to start hot DRI conveying;
starting a speed reducing motor 23, wherein the speed reducing motor 23 drags a chain 25 to drive each scraper 22 to continuously run through a first chain wheel 24, and each scraper 22 pushes the material in the hot-feed tank structure 21 to move towards a discharge hole;
step d: starting the high-level bin system 3, adding smelting materials (slag making materials for an electric furnace, alloy and other materials) into the scraper hot-feeding device 2 through a vibrating feeder (prior art), a belt conveyor (prior art) and a chute, mixing the smelting materials (the slag making materials for the electric furnace, the alloy and other materials) with hot direct reduced iron in the scraper hot-feeding device 2, and pushing the materials in the hot-feeding groove structure 21 to move towards a discharge hole by each scraper 22 to a hopper at the top of the electric furnace.
From the above, the scraper type hot direct reduced iron conveying device and method have the following beneficial effects:
according to the application, the hot direct reduced iron storage tank is arranged below the shaft furnace, and the gravity blanking of the hot direct reduced iron is utilized to realize the transfer of hot DRI, so that the lifting climbing in the traditional DRI conveying process is reduced, and the energy consumption is reduced; the hot direct reduced iron storage tank can store and meter the hot direct reduced iron output from the bottom outlet of the shaft furnace in a closed and heat-preserving manner, so that the functions of hot DRI storage, metering and closed conveying are realized, and the energy consumption in the conveying process is reduced; each scraper of the scraper hot feeding device runs along the hot feeding groove structure to push hot DRI and smelting materials to move towards the direction of the discharge hole; the application realizes DRI hot feeding and hot charging between the shaft furnace and the electric furnace in a simple and reliable mode, can adapt to different engineering application environments, greatly simplifies equipment structure compared with other schemes such as a skirt plate bucket, reduces engineering investment, equipment failure rate and maintenance cost, reduces electric furnace ton steel smelting electricity consumption (-125 kWh/t) and improves production efficiency.
The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this application, and are intended to be within the scope of this application.
Claims (8)
1. The scraper type hot direct reduced iron conveying device is characterized by comprising a hot direct reduced iron storage tank, a scraper type hot conveying device and a high-level bin system; the hot direct reduced iron storage tank is arranged below the shaft furnace and is used for hermetically storing and metering hot direct reduced iron output from an outlet at the bottom of the shaft furnace in a heat-preserving manner; the scraper hot feeding device is arranged below the hot direct reduced iron storage tank and comprises a hot feeding groove structure, a first end of the hot feeding groove structure can be communicated with an outlet of the hot direct reduced iron storage tank, the second end of the hot feeding groove structure is provided with a discharge hole which can be communicated with the electric furnace, the bottom of the hot feeding groove structure is provided with a plurality of scrapers which can move along the hot feeding groove structure, and each scraper runs along the hot feeding groove structure to convey hot direct reduced iron to the electric furnace; the high-level bin system is positioned above the scraper hot feeding device and is used for feeding smelting materials into the hot feeding groove structure;
the scraper hot conveying device comprises a gear motor arranged at one end of a hot conveying groove structure, a first sprocket is connected to the gear motor, a chain is arranged in the hot conveying groove structure, the chain is sleeved on the first sprocket, the scrapers are parallel and connected to the chain at intervals, and the gear motor drags the chain belt through the first sprocket to push the materials in the hot conveying groove structure to move towards a discharge hole;
the speed reducing motor is arranged at the second end of the hot-feeding groove structure, the first end of the hot-feeding groove structure is provided with a second sprocket, the chain is sleeved on the second sprocket, and the first end of the hot-feeding groove structure is further provided with a tensioning device connected with the second sprocket;
a sealing cover capable of sealing the hot feeding groove structure from the top is arranged above the hot feeding groove structure, and a sealing bin is formed between the sealing cover and the hot feeding groove structure; the top of the sealing bin is provided with a first feed inlet, and the outlet of the hot direct reduced iron storage tank is communicated with the first feed inlet;
the top of the hot feeding groove structure is provided with a sealing gas pipe, and the sealing gas pipe is used for blowing inert gas into the sealing bin to reduce the secondary oxidation of hot direct reduced iron.
2. The scraped surface hot direct reduced iron delivery apparatus of claim 1 wherein the gear motor is coupled to the first sprocket by a coupling.
3. The apparatus for transporting hot reduced iron according to claim 1, wherein the hot feed trough structure comprises an upper trough and a lower trough, the chains are respectively provided at the bottoms of the upper trough and the lower trough, and a plurality of scrapers are provided on each chain in parallel and at intervals.
4. The scraped thermal direct reduced iron delivery apparatus of claim 1 wherein the hot runner structure comprises a runner body having a thermally insulated runner liner disposed therein.
5. The scraper blade type hot direct reduced iron delivery apparatus according to claim 1, wherein the scraper blade is made of cast iron plate, heat-resistant and wear-resistant alloy steel or stainless steel material.
6. The scraper type hot direct reduced iron delivery apparatus according to claim 1, wherein the chain is made of heat-resistant and wear-resistant alloy steel or stainless steel material.
7. The scraped hot direct reduced iron delivery apparatus of claim 1 wherein the hot direct reduced iron storage tank comprises a first shell having a tank liner disposed therein; the top of the hot direct reduced iron storage tank is provided with a first valve capable of being automatically closed, the bottom of the hot direct reduced iron storage tank is provided with a second valve capable of being automatically closed, the hot direct reduced iron storage tank is communicated with a high-temperature-resistant chute through the second valve, and the bottom of the high-temperature-resistant chute is communicated with the first end of the hot feeding groove structure; the hot direct reduced iron storage tank support is arranged on a first tank body support, and a weighing device is arranged at the bottom of the first tank body support.
8. A method for transporting hot direct reduced iron by a scraper, characterized by using the hot direct reduced iron transporting apparatus according to any one of claims 1 to 7, comprising the steps of:
step a: adding the hot direct reduced iron in the shaft furnace into a hot direct reduced iron storage tank, and storing and metering the hot direct reduced iron in the hot direct reduced iron storage tank;
step b: adding the hot direct reduced iron in the hot direct reduced iron storage tank into a scraper hot conveying device;
step c: starting a scraper hot conveying device to start hot DRI conveying;
step d: and starting the high-level bin system, adding smelting materials into the scraper hot feeding device, mixing the smelting materials with hot direct reduced iron, and pushing the materials to move towards a discharge hole by each scraper to a hopper at the top of the electric furnace.
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| CN202210605892.2A CN114854932B (en) | 2022-05-31 | 2022-05-31 | Scraper type hot direct reduced iron conveying device and method |
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