CN117187468A - Device and method for hot charging and hot feeding of scrap steel and direct reduced iron in cooperation - Google Patents

Abstract

The application relates to a device and a method for carrying out cooperative hot charging and hot feeding on scrap steel and direct reduced iron, wherein the device comprises a hot direct reduced iron storage tank, a first high-temperature-resistant Wen Liuguan, a scrap steel horizontal conveying device, a high-temperature-resistant mixing hopper, a vaporization cooling system and a high-level stock bin system; the hot direct reduced iron storage tank 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 scrap steel horizontal conveying device is arranged below the hot direct reduced iron storage tank and comprises a horizontal vibration feeding section and a horizontal vibration preheating section which are sequentially arranged, the vaporization cooling system comprises a vaporization water-cooling smoke hood which is buckled on the horizontal vibration preheating section, the vaporization water-cooling smoke hood is used for recovering waste heat of electric furnace smoke, and the horizontal vibration preheating section is used for preheating scrap steel and conveying the scrap steel to the electric furnace. The application realizes the cooperative hot feeding and hot charging of the scrap steel and DRI used by the electric furnace in a simple and reliable mode, can adapt to different engineering application environments and improves the production efficiency.

Description

Device and method for hot charging and hot feeding of scrap steel and direct reduced iron in cooperation

Technical Field

The application relates to the technical field of steelmaking, in particular to a device and a method for hot charging and hot feeding of scrap steel and direct reduced iron in a synergic manner.

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 device and a method for collaborative hot charging and hot feeding of scrap steel and direct reduced iron 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 device and a method for collaborative hot charging and hot charging of scrap steel and direct reduced iron, which realize collaborative hot charging and hot charging of scrap steel and DRI used by an electric furnace in a simple and reliable mode, and can adapt to different engineering application environments.

The application aims to realize that the device for carrying out hot charging and hot feeding by combining scrap steel and direct reduced iron comprises a hot direct reduced iron storage tank, a first high-temperature-resistant Wen Liuguan, a scrap steel horizontal conveying device, a high-temperature-resistant mixing hopper, a vaporization cooling system and a high-level stock 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 bottom of the hot direct reduced iron storage tank is communicated with the first high-resistance Wen Liuguan;

the scrap steel horizontal conveying device is arranged below the hot direct reduced iron storage tank and comprises a horizontal vibration feeding section and a horizontal vibration preheating section which are sequentially arranged, wherein the horizontal vibration feeding section is used for transmitting scrap steel vibration to the horizontal vibration preheating section; the vaporization cooling system comprises a vaporization water-cooling smoke hood which is buckled on the horizontal vibration preheating section and is used for recovering waste heat of electric furnace smoke, and the horizontal vibration preheating section is used for preheating scrap steel and transmitting the scrap steel to an electric furnace;

the high-temperature-resistant mixing hopper is arranged at the top of the electric furnace, the high-level bin system is located above the high-temperature-resistant mixing hopper and is used for throwing smelting materials into the high-temperature-resistant mixing hopper, the bottom of the first high-temperature-resistant Wen Liuguan is communicated with the high-temperature-resistant mixing hopper, and the high-temperature-resistant mixing hopper is used for mixing hot direct reduced iron and smelting materials.

In a preferred embodiment of the application, the furnace further comprises a standby hot storage tank, wherein the standby hot storage tank is used for airtight heat preservation storage and metering of hot direct reduced iron output from an outlet at the bottom of the shaft furnace; the standby heat storage tank is arranged below the shaft furnace, the bottom of the standby heat storage tank is communicated with the horizontal vibration preheating section through a second high-temperature-resistant chute, and the standby heat storage tank transmits the hot direct reduced iron to the horizontal vibration preheating section, and the hot direct reduced iron and the preheated scrap steel are mixed and then fed into the furnace.

In a preferred embodiment of the application, one end of the horizontal vibration feeding section, which is far away from the horizontal vibration preheating section, is connected with a first vibration exciter, and the first vibration exciter is used for driving the horizontal vibration feeding section to transmit scrap steel to the horizontal vibration preheating section; the one end that horizontal vibration preheating section is close to horizontal vibration charging section connects the second vibration exciter, the one end that horizontal vibration preheating section kept away from horizontal vibration charging section sets up vibration feeding dolly, the second vibration exciter is used for driving horizontal vibration preheating section is with the steel scrap transmission extremely vibration feeding dolly, vibration feeding dolly is used for adding the steel scrap into the electric stove.

In a preferred embodiment of the application, a dynamic sealing device is arranged on the horizontal vibration preheating section at a position between the second vibration exciter and the vaporization water-cooling smoke hood.

In a preferred embodiment of the present application, the horizontal vibration preheating section includes a feeding tank structure, the feeding tank structure is disposed on a tank bracket, and the tank bracket is connected with the second vibration exciter.

In a preferred embodiment of the application, the vaporization water-cooled fume hood comprises a fume hood body, and a steam-water composite pipeline is arranged on the fume hood body.

In a preferred embodiment of the application, a smoke exhaust hole is arranged at one end of the vaporization water-cooling smoke hood close to the horizontal vibration feeding section.

In a preferred embodiment of the application, a plate conveyor is arranged on one side of the horizontal vibratory feed section, said plate conveyor being used for conveying scrap steel to the horizontal vibratory feed section.

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, and the hot direct reduced iron storage tank is communicated with the first high-resistance Wen Liuguan through the second valve; 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.

In a preferred embodiment of the present application, the backup thermal storage tank comprises a second tank shell having a tank liner disposed therein; the top of the standby hot storage tank is provided with a third valve capable of being automatically closed, the bottom of the standby hot storage tank is provided with a fourth valve capable of being automatically closed, the standby hot storage tank is communicated with a second high-temperature-resistant chute through the fourth valve, and the bottom of the second high-temperature-resistant chute is communicated with the horizontal vibration preheating section; the standby hot storage tank support is arranged on a second tank support, and a weighing device is arranged at the bottom of the second tank support.

In a preferred embodiment of the present application, the first refractory Wen Liuguan includes a first shell having a first tube liner disposed therein; the top of the first high-resistance Wen Liuguan is connected with the hot direct reduced iron storage tank through a thermal expansion joint.

In a preferred embodiment of the application, the high temperature resistant mixing bucket comprises a bucket outer shell, wherein a shell lining is arranged in the bucket outer shell; the top of the high-temperature-resistant mixing hopper is provided with a first feeding port and a second feeding port, the first feeding port is communicated with the bottom of the first high-temperature-resistant Wen Liuguan, and the second feeding port is used for feeding smelting materials from a high-level bin system; the bottom of the high-temperature-resistant mixing hopper is communicated with the electric furnace.

The application can also realize the aim of the application, namely a scrap steel and direct reduced iron collaborative hot charging and hot feeding method, which adopts the device for collaborative hot charging and hot feeding of scrap steel and direct reduced iron, comprising,

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 high temperature resistant mixing hopper through a first high temperature resistant Wen Liuguan; the high-level bin system inputs smelting materials into a high-temperature-resistant mixing hopper, and the high-temperature-resistant mixing hopper inputs hot DRI and the smelting materials into an electric furnace;

step c: synchronously with the step b, the horizontal vibration feeding section of the scrap steel horizontal conveying device transmits scrap steel vibration to the horizontal vibration preheating section; the vaporization water-cooling fume hood recovers waste heat of the fume of the electric furnace to preheat the waste steel of the horizontal vibration preheating section, and the horizontal vibration preheating section and the vibration feeding trolley convey the preheated waste steel to the electric furnace through non-harmonic vibration to finish the hot charging of the waste steel.

From the above, the device and the method for the collaborative hot charging and hot feeding of the scrap steel and the direct reduced iron 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 be used for storing and metering hot direct reduced iron output from an outlet at the bottom of the shaft furnace in a closed heat-preserving manner, so that the concepts of hot DRI storage, metering and conveying are realized, and the energy consumption in the conveying process is reduced; in the scrap steel horizontal conveying device, a horizontal vibration feeding section is used for transmitting scrap steel vibration to a horizontal vibration preheating section, a vaporization water-cooling smoke hood is used for recovering waste heat of electric furnace smoke so as to preheat scrap steel in the horizontal vibration preheating section, and the horizontal vibration preheating section is used for conveying the preheated scrap steel to an electric furnace; the hot direct reduced iron storage tank, the first high-temperature-resistant Wen Liuguan, the scrap steel horizontal conveying device and the high-temperature-resistant mixing hopper cooperate to realize the cooperative hot charging and hot conveying of scrap steel and direct reduced iron; the application adopts a simple and reliable mode to realize the cooperative hot feeding and hot charging of scrap steel and DRI used by an electric furnace, and can adapt to different engineering application environments.

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 device is a schematic diagram of the scrap steel and direct reduced iron combined hot charging and hot feeding device.

Fig. 2: is a cross-sectional view A-A in fig. 1.

Fig. 3: is a sectional view B-B in FIG. 1.

In the figure:

100. a device for hot charging and hot feeding of scrap steel and direct reduced iron in a synergistic manner;

1. a hot direct reduced iron storage tank;

21. first high resistance Wen Liuguan; 22. a second refractory chute; 23. a thermal expansion joint;

3. a scrap steel horizontal conveying device;

31. a horizontal vibratory feed section; 32. a horizontal vibration preheating section; 321. a feed tank structure; 322. a slot bracket; 33. vaporizing the water-cooled fume hood; 331. a smoke hood body; 332. a steam-water composite pipeline; 34. a first vibration exciter; 35. a second vibration exciter; 36. a vibratory feed cart; 37. a smoke vent; 38. a plate conveyor; 39. a dynamic sealing device;

4. high temperature resistant mixing bucket;

5. a shaft furnace;

6. an electric furnace;

7. a high-level stock bin system;

8. and (5) a standby hot storage tank.

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 3, the application provides a scrap steel and direct reduced iron collaborative hot charging and hot feeding device 100, which comprises a hot direct reduced iron storage tank 1, a first high-temperature resistant Wen Liuguan 21, a scrap steel horizontal conveying device 3, a high-temperature resistant mixing hopper 4, a vaporization cooling system and a high-level bin system 7;

the hot direct reduced iron storage tank 1 is arranged below the shaft furnace 5, 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 in a heat-preserving manner; the bottom of the hot direct reduced iron storage tank 1 is communicated with a first high-resistance Wen Liuguan 21;

the scrap steel horizontal conveying device 3 is arranged below the hot direct reduced iron storage tank 1, and the scrap steel horizontal conveying device 3 comprises a horizontal vibration feeding section 31 and a horizontal vibration preheating section 32 which are sequentially arranged, wherein the horizontal vibration feeding section 31 is used for transmitting scrap steel vibration to the horizontal vibration preheating section 32; the vaporization cooling system comprises a vaporization water-cooling smoke hood 33 buckled on the horizontal vibration preheating section 32, the vaporization water-cooling smoke hood 33 is used for recovering waste heat of electric furnace smoke, and the horizontal vibration preheating section 32 is used for preheating scrap steel and transmitting the scrap steel to the electric furnace 6;

the high temperature resistant mixing bucket 4 is arranged at the top of the electric furnace 6, the high-level bin system is located above the high temperature resistant mixing bucket 4 and is used for throwing smelting materials into the high temperature resistant mixing bucket 4, the bottom of the first high temperature resistant Wen Liuguan is communicated with the high temperature resistant mixing bucket 4, and the high temperature resistant mixing bucket 4 is used for mixing hot direct reduced iron and smelting materials.

The hot direct reduced iron storage tank 1 is arranged below the shaft furnace, hot direct reduced iron (hot DRI, 500-800 ℃) reduced by the shaft furnace (a 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, and when the DRI needs to be added into a downstream electric furnace, the hot DRI can fall into a high-temperature-resistant mixing hopper 4 at the top of the electric furnace through a first high-temperature-resistant Wen Liuguan 21; the smelting material from the high-level bin system 7 and the hot DRI are mixed in the high-temperature resistant mixing hopper 4 and then added into the electric furnace 6.

In the scrap steel horizontal conveying device 3, the horizontal vibration feeding section 31 is used for transmitting scrap steel vibration to the horizontal vibration preheating section 32, the vaporization water-cooling smoke hood 33 is used for recovering waste heat of electric furnace smoke so as to preheat scrap steel of the horizontal vibration preheating section 32, and the horizontal vibration preheating section 32 is used for conveying the preheated scrap steel to an electric furnace, so that scrap steel hot charging is realized.

The application provides a device for hot charging and hot conveying of scrap steel and direct reduced iron in a cooperative manner, wherein a hot direct reduced iron storage tank is arranged below a shaft furnace, and the transfer of hot DRI is realized by utilizing gravity blanking of the hot direct reduced iron, 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 be used for storing and metering hot direct reduced iron output from an outlet at the bottom of the shaft furnace in a closed heat-preserving manner, so that the concepts of hot DRI storage, metering and conveying are realized, and the energy consumption in the conveying process is reduced; in the scrap steel horizontal conveying device, a horizontal vibration feeding section is used for transmitting scrap steel vibration to a horizontal vibration preheating section, a vaporization water-cooling smoke hood is used for recovering waste heat of electric furnace smoke so as to preheat scrap steel in the horizontal vibration preheating section, and the horizontal vibration preheating section is used for conveying the preheated scrap steel to an electric furnace; the hot direct reduced iron storage tank, the first high-temperature-resistant Wen Liuguan, the scrap steel horizontal conveying device and the high-temperature-resistant mixing hopper cooperate to realize the cooperative hot charging and hot conveying of scrap steel and direct reduced iron; the application adopts a simple and reliable mode to realize the cooperative hot feeding and hot charging of scrap steel and DRI used by an electric furnace, and can adapt to different engineering application environments.

Further, as shown in fig. 1, the device 100 for combining scrap steel and direct reduced iron with hot charging and hot feeding further comprises a standby hot storage tank 8, wherein the standby hot storage tank 8 is used for hermetically storing and metering hot direct reduced iron output from the bottom outlet of the shaft furnace in a heat-preserving manner; the standby heat storage tank 8 is arranged below the shaft furnace 5, the bottom of the standby heat storage tank 8 is communicated with the horizontal vibration preheating section 32 through the second high-temperature-resistant chute 22, the standby heat storage tank 8 transmits the hot direct reduced iron to the horizontal vibration preheating section 32, and the hot direct reduced iron and the preheated scrap steel are mixed and then fed into the furnace.

The backup hot storage tank 8 provides a passage for the backup hot DRI to enter the furnace through which the external hot DRI can be fed directly through the gasification water cooled fume hood 33 into the horizontal vibratory preheating section 32 (scrap preheating section) for addition to the scrap from the side holes of the electric furnace to achieve synergistic heat entry into the furnace.

In this embodiment, the backup thermal storage tank 8 includes a second tank shell within which a tank liner is disposed; the top of the standby heat storage tank is provided with a third valve capable of being automatically closed, the bottom of the standby heat storage tank is provided with a fourth valve capable of being automatically closed, the standby heat storage tank is communicated with a second high-temperature-resistant chute through the fourth valve, and the bottom of the second high-temperature-resistant chute is communicated with the horizontal vibration preheating section; the standby hot storage tank support is arranged on a second tank body support, and a weighing device is arranged at the bottom of the second tank body support. The standby hot storage tank 8 feeds the hot direct reduced iron to the horizontal vibration preheating section 32 through the second high temperature resistant chute 22, and achieves the composite feeding of the hot DRI and the preheated scrap steel into the furnace.

Further, as shown in fig. 1, one end of the horizontal vibration feeding section 31, which is far away from the horizontal vibration preheating section 32, is connected with a first vibration exciter 34 (a tail vibration exciter), and the first vibration exciter 34 is used for driving the horizontal vibration feeding section 31 to transmit scrap steel to the horizontal vibration preheating section 32; one end of the horizontal vibration preheating section, which is close to the horizontal vibration feeding section, is connected with a second vibration exciter 35 (middle vibration exciter), one end of the horizontal vibration preheating section 32, which is far away from the horizontal vibration feeding section, is provided with a vibration feeding trolley 36, the second vibration exciter 35 is used for driving the horizontal vibration preheating section to transmit the scrap steel to the vibration feeding trolley 36, and the vibration feeding trolley 36 is used for adding the scrap steel into the electric furnace 6. The horizontal vibration feeding section 31 controls the feeding speed through the frequency conversion of the first vibration exciter 34 (the tail vibration exciter), and the horizontal vibration preheating section 32 controls the feeding speed through the frequency conversion of the second vibration exciter 35 (the middle vibration exciter). The scrap steel is preheated in the horizontal vibration preheating section 32 by high-temperature flue gas from the electric furnace and then added into an electric furnace molten pool through the vibration feeding trolley 36, so that the scrap steel hot charging is realized.

Further, as shown in fig. 1, a dynamic sealing device 39 is provided on the horizontal vibration preheating section 32 at a position between the second vibration exciter 35 and the vaporization water cooled hood 33.

Further, as shown in fig. 3, the horizontal vibration preheating section 32 includes a feeding tank structure 321, the feeding tank structure 321 is disposed on a tank bracket 322, and the tank bracket 322 is connected to the second vibration exciter 35.

Further, as shown in fig. 3, the vaporization water-cooled fume hood 33 includes a fume hood body 331, and a steam-water composite pipe 332 is provided on the fume hood body 331.

The vaporization water-cooling fume hood 33 and the electric furnace fume quenching waste heat boiler (prior art) are matched to recover the waste heat of the electric furnace fume, the vaporization water-cooling fume hood 33 forms a main component of a vaporization cooling system, the vaporization cooling system can be further provided with auxiliary facilities such as a heat accumulator, a steam drum, a deaerator, a water supply pump and the like, and the recovered steam can be used for steam dragging of a dust removal fan of the electric furnace or other facilities.

Further, as shown in fig. 1, the vaporization water cooled fume hood 33 is provided with a fume hole 37 near one end of the horizontal vibration charging section 31.

Further, as shown in fig. 2, a plate conveyor 38 is provided at one side of the horizontal vibratory feeding section 31, and the plate conveyor 38 is used for transferring the scrap steel to the horizontal vibratory feeding section 31. The horizontal vibratory feed section 31 is provided with one or more plate conveyors 38. The plate conveyors 38 are used to load the horizontal vibratory feed section 31 with scrap steel. The plate conveyors 38 may use a disk crane or a steel grab to load the scrap steel.

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 capable of being automatically closed, the bottom of the hot direct reduction iron storage tank is provided with a second valve capable of being automatically closed, and the hot direct reduction iron storage tank is communicated with the first high-resistance Wen Liuguan through the second valve; 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.

Further, the first high-temperature-resistant Wen Liuguan comprises a first tube shell, a first tube lining is arranged in the first tube shell, and the first tube 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 first high-resistance Wen Liuguan is connected with a hot direct reduced iron storage tank through a thermal expansion joint 23 so as to reduce the thermal stress of the storage tank.

Further, the high temperature resistant mixing hopper 4 comprises a hopper shell (steel shell), wherein a shell lining is arranged in the hopper shell, and 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 mixing hopper 4 is provided with a first feeding port and a second feeding port, the first feeding port is communicated with the bottom of the first high-temperature-resistant Wen Liuguan, and the second feeding port is used for feeding smelting materials (slag materials, alloy and other materials for an electric furnace) from a high-level stock bin system; the bottom of the high temperature resistant mixing hopper is communicated with an electric furnace 6.

The application also provides a scrap steel and direct reduced iron collaborative hot charging and hot feeding method, which adopts the scrap steel and direct reduced iron collaborative hot charging and hot feeding device 100, and comprises the following steps:

step a: the hot direct reduced iron in the shaft furnace 5 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 5 is communicated with the top of the hot direct reduced iron storage tank 1 through a chute, and the hot DRI is gravity fed into the hot direct reduced iron storage tank 1 and stored in the hot direct reduced iron storage tank 1 with sealing, heat preservation and weighing functions.

Step b: adding the hot direct reduced iron in the hot direct reduced iron storage tank 1 into the high temperature resistant mixing hopper 4 through a first high temperature resistant Wen Liuguan 21; the high-level bin system 7 inputs smelting materials (slag making materials for an electric furnace, alloy materials and the like) into the high-temperature resistant mixing hopper 4, and the high-temperature resistant mixing hopper 4 inputs hot DRI and smelting materials (slag making materials for an electric furnace, alloy materials and the like) into the electric furnace;

step c: synchronously with step b, the horizontal vibration feeding section 31 of the scrap horizontal conveying device transmits scrap vibration to the horizontal vibration preheating section 32; the vaporization water-cooling fume hood recovers waste heat of the electric furnace fume to preheat the waste steel of the horizontal vibration preheating section 32, and the horizontal vibration preheating section 32 and the vibration feeding trolley 36 convey the preheated waste steel to the electric furnace through non-harmonic vibration to finish the hot charging of the waste steel.

In addition, the hot direct reduced iron in the shaft furnace 5 may be fed through a backup tunnel, namely: the hot direct reduced iron in the shaft furnace 5 is added into a standby heat storage tank 8, the standby heat storage tank 8 directly drops the hot direct reduced iron onto the scrap steel in the horizontal vibration preheating section 32 through the vaporization cooling smoke hood, and the hot direct reduced iron and the preheated scrap steel are mixed and then added into the electric furnace through a furnace wall side hole.

From the above, the device and the method for the collaborative hot charging and hot feeding of the scrap steel and the direct reduced iron 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 be used for storing and metering hot direct reduced iron output from an outlet at the bottom of the shaft furnace in a closed heat-preserving manner, so that the concepts of hot DRI storage, metering and conveying are realized, and the energy consumption in the conveying process is reduced; in the scrap steel horizontal conveying device, a horizontal vibration feeding section is used for transmitting scrap steel vibration to a horizontal vibration preheating section, a vaporization water-cooling smoke hood is used for recovering waste heat of electric furnace smoke so as to preheat scrap steel in the horizontal vibration preheating section, and the horizontal vibration preheating section is used for conveying the preheated scrap steel to an electric furnace; the hot direct reduced iron storage tank, the first high-temperature-resistant Wen Liuguan, the scrap steel horizontal conveying device and the high-temperature-resistant mixing hopper cooperate to realize the cooperative hot charging and hot conveying of scrap steel and direct reduced iron; the application adopts a simple and reliable mode to realize the cooperative hot feeding and hot charging of scrap steel and DRI used by an electric furnace, and can adapt to different engineering application environments.

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 (13)

1. The device is characterized by comprising a hot direct reduced iron storage tank, a first high-temperature-resistant Wen Liuguan, a scrap steel horizontal conveying device, a high-temperature-resistant mixing hopper, a vaporization cooling system and a high-level stock 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 bottom of the hot direct reduced iron storage tank is communicated with the first high-resistance Wen Liuguan;

the scrap steel horizontal conveying device is arranged below the hot direct reduced iron storage tank and comprises a horizontal vibration feeding section and a horizontal vibration preheating section which are sequentially arranged, wherein the horizontal vibration feeding section is used for transmitting scrap steel vibration to the horizontal vibration preheating section; the vaporization cooling system comprises a vaporization water-cooling smoke hood which is buckled on the horizontal vibration preheating section and is used for recovering waste heat of electric furnace smoke, and the horizontal vibration preheating section is used for preheating scrap steel and transmitting the scrap steel to an electric furnace;

the high-temperature-resistant mixing hopper is arranged at the top of the electric furnace, the high-level bin system is located above the high-temperature-resistant mixing hopper and is used for throwing smelting materials into the high-temperature-resistant mixing hopper, the bottom of the first high-temperature-resistant Wen Liuguan is communicated with the high-temperature-resistant mixing hopper, and the high-temperature-resistant mixing hopper is used for mixing hot direct reduced iron and smelting materials.

2. The scrap and direct reduced iron co-hot charging and hot charging apparatus according to claim 1, further comprising a backup hot storage tank for closed insulation storage and metering of hot direct reduced iron output from the bottom outlet of the shaft furnace; the standby heat storage tank is arranged below the shaft furnace, the bottom of the standby heat storage tank is communicated with the horizontal vibration preheating section through a second high-temperature-resistant chute, and the standby heat storage tank transmits the hot direct reduced iron to the horizontal vibration preheating section, and the hot direct reduced iron and the preheated scrap steel are mixed and then fed into the furnace.

3. The scrap steel and direct reduced iron collaborative hot charging and hot feeding device according to claim 2, wherein one end of the horizontal vibration charging section away from the horizontal vibration preheating section is connected with a first vibration exciter, and the first vibration exciter is used for driving the horizontal vibration charging section to transmit scrap steel to the horizontal vibration preheating section; the one end that horizontal vibration preheating section is close to horizontal vibration charging section connects the second vibration exciter, the one end that horizontal vibration preheating section kept away from horizontal vibration charging section sets up vibration feeding dolly, the second vibration exciter is used for driving horizontal vibration preheating section is with the steel scrap transmission extremely vibration feeding dolly, vibration feeding dolly is used for adding the steel scrap into the electric stove.

4. A scrap and direct reduced iron synergistic hot charging and hot runner apparatus as claimed in claim 3, characterised in that a dynamic sealing means is provided at the horizontal vibration preheating section at a location between the second vibration exciter and the vaporising water cooled fume hood.

5. The apparatus for collaborative hot charging and hot feeding of scrap and direct reduced iron according to claim 4 wherein said horizontal vibratory pre-heating section includes a feed tank structure disposed on a tank bracket connected to said second exciter.

6. The scrap steel and direct reduced iron collaborative hot charging and hot feeding device according to claim 2, wherein the vaporization water-cooled fume hood comprises a fume hood body, and a steam-water composite pipeline is arranged on the fume hood body.

7. The scrap steel and direct reduced iron collaborative hot charging and hot feeding device according to claim 2, wherein a smoke discharging hole is arranged at one end of the vaporization water cooling smoke hood close to the horizontal vibration feeding section.

8. The scrap and direct reduced iron co-hot charging and hot feeding apparatus as set forth in claim 2, wherein a plate conveyor is provided at one side of the horizontal vibratory charging section for transferring the scrap to the horizontal vibratory charging section.

9. The scrap and direct reduced iron co-hot charging and hot feed apparatus in accordance with claim 2 wherein 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, and the hot direct reduced iron storage tank is communicated with the first high-resistance Wen Liuguan through the second valve; 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.

10. The scrap and direct reduced iron co-hot charging and hot feed apparatus in accordance with claim 2 wherein the backup hot storage tank includes a second shell having a tank liner disposed therein; the top of the standby hot storage tank is provided with a third valve capable of being automatically closed, the bottom of the standby hot storage tank is provided with a fourth valve capable of being automatically closed, the standby hot storage tank is communicated with a second high-temperature-resistant chute through the fourth valve, and the bottom of the second high-temperature-resistant chute is communicated with the horizontal vibration preheating section; the standby hot storage tank support is arranged on a second tank support, and a weighing device is arranged at the bottom of the second tank support.

11. The scrap and direct reduced iron co-hot charging and hot feed apparatus in accordance with claim 2 wherein the first refractory Wen Liuguan comprises a first shell having a first tube liner disposed therein; the top of the first high-resistance Wen Liuguan is connected with the hot direct reduced iron storage tank through a thermal expansion joint.

12. The scrap and direct reduced iron co-hot charging and hot feed apparatus in accordance with claim 2 wherein the refractory mixing hopper includes a hopper shell having a shell liner disposed therein; the top of the high-temperature-resistant mixing hopper is provided with a first feeding port and a second feeding port, the first feeding port is communicated with the bottom of the first high-temperature-resistant Wen Liuguan, and the second feeding port is used for feeding smelting materials from a high-level bin system; the bottom of the high-temperature-resistant mixing hopper is communicated with the electric furnace.

13. A method for collaborative hot charging and hot charging of scrap steel and direct reduced iron, characterized in that the device for collaborative hot charging and hot charging of scrap steel and direct reduced iron according to any one of claims 1 to 12 is adopted, comprising,

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 high temperature resistant mixing hopper through a first high temperature resistant Wen Liuguan; the high-level bin system inputs smelting materials into a high-temperature-resistant mixing hopper, and the high-temperature-resistant mixing hopper inputs hot DRI and the smelting materials into an electric furnace;

step c: synchronously with the step b, the horizontal vibration feeding section of the scrap steel horizontal conveying device transmits scrap steel vibration to the horizontal vibration preheating section; the vaporization water-cooling fume hood recovers waste heat of the fume of the electric furnace to preheat the waste steel of the horizontal vibration preheating section, and the horizontal vibration preheating section and the vibration feeding trolley convey the preheated waste steel to the electric furnace through non-harmonic vibration to finish the hot charging of the waste steel.