CN111349737A - Rotary hearth furnace structure for burning blast furnace gas - Google Patents
Rotary hearth furnace structure for burning blast furnace gas Download PDFInfo
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- CN111349737A CN111349737A CN201811579685.4A CN201811579685A CN111349737A CN 111349737 A CN111349737 A CN 111349737A CN 201811579685 A CN201811579685 A CN 201811579685A CN 111349737 A CN111349737 A CN 111349737A
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- hearth
- furnace body
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
- C21B13/085—Making spongy iron or liquid steel, by direct processes in rotary furnaces wherein iron or steel is obtained in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention provides a rotary hearth furnace structure for burning blast furnace gas, which comprises a square furnace body and a supporting assembly for supporting the square furnace body, wherein burners are respectively arranged at four corners of the square furnace body, gas ports are arranged on two surfaces, which are opposite to the square furnace body, and the gas ports are positioned at the lower part of the square furnace body. Because the density of the coal gas is less than that of the air, the coal gas port is arranged at the lower part of the square furnace body, and the coal gas floats to the top of the hearth after entering the hearth from the coal gas port, so that the whole hearth is filled with the coal gas, and the heating of the hearth is facilitated. The two gas ports are oppositely arranged, so that the convection of gas in the hearth can be prevented, the gas can be quickly paved at the bottom of the whole hearth, and the gas filling material at the bottom of the hearth promotes the air to float upwards, thereby being more beneficial to the combustion at the bottom of the hearth.
Description
Technical Field
The invention belongs to the field of iron making, and particularly relates to a rotary hearth furnace structure for burning blast furnace gas.
Background
The smelting reduction technology of rotary hearth furnace is to add the carbon-containing pellets after mixing, pelletizing and drying into a rotary hearth furnace with an annular hearth and a rotatable hearth, and iron ore is reduced by carbon in the process of rotating one circle along with the hearth at the hearth temperature of about 1350 ℃.
The existing rotary hearth furnace can only adopt the rotary hearth furnace melting reduction iron-making process to reduce the green pellets into metallized pellets, and the rotary hearth furnace cannot utilize the surplus coal gas of the blast furnace in the working process.
Based on this, it is urgently needed to provide a rotary hearth furnace structure capable of utilizing the surplus coal gas of the blast furnace.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a rotary hearth furnace structure for burning blast furnace gas. The technical problem to be solved by the invention is realized by the following technical scheme:
the utility model provides a rotary hearth furnace structure of burning blast furnace gas, includes square furnace body, is used for supporting the supporting component of square furnace body, four corners of square furnace body are equipped with the nozzle respectively, be equipped with the gas mouth on two faces that square furnace body just right, the gas mouth is located the lower part of square furnace body. Because the density of the coal gas is less than that of the air, the coal gas port is arranged at the lower part of the square furnace body, and the coal gas floats to the top of the hearth after entering the hearth from the coal gas port, so that the whole hearth is filled with the coal gas, and the heating of the hearth is facilitated. The two gas ports are oppositely arranged, so that the convection of gas in the hearth can be prevented, the gas can be quickly paved at the bottom of the whole hearth, and the gas filling material at the bottom of the hearth promotes the air to float upwards, thereby being more beneficial to the combustion at the bottom of the hearth.
As a further improvement of the invention, a plurality of baffles for dividing the hearth into different areas are arranged in the hearth, the baffles are respectively and fixedly connected with the inner wall of the hearth, the baffles are fixedly connected with each other, and a gap is formed between each baffle and the bottom of the hearth. The invention aims to provide a gap between the baffle and the bottom of the hearth, so that coal gas can be conveniently diffused to each region. Preferably, the hearth is divided into a charging area, a preheating reduction area, a heating reduction area, a high-temperature reduction area and a control reduction area by a plurality of baffles, and two gas ports are formed in the inner wall of the high-temperature reduction area.
As a further improvement of the invention, the burner is positioned in the middle of the hearth and is arranged between two adjacent baffles. The burner is arranged in the middle of the hearth, so that the problem that the burner cannot work normally due to the fact that the burner is blocked when the hearth discharges materials is solved.
As a further improvement of the invention, the lower end of the square furnace body is opened, the bottom end of the square furnace body is provided with a rotating device, and the upper surface of the rotating device is in contact with the bottom surface of the furnace wall of the square furnace body. The invention aims to arrange a rotating device at the lower end of a square furnace body, and the mixture rotates along with the rotating device in a hearth and sequentially passes through a charging area, a preheating reduction area, a heating reduction area, a high-temperature reduction area and a control reduction area to finish the reduction process.
As a further improvement of the invention, the square furnace body is also provided with at least one air supplement nozzle which is positioned at the upper part of the square furnace body, and the air supplement nozzles and the burners are arranged in a staggered manner. The air supplementing nozzle is arranged at the upper part of the square furnace body, and air is blown into the air supplementing nozzle to combust coal gas, so that heat is provided for the temperature rise and the reduction reaction of the mixture, and the mixture is quickly heated to over 1100 ℃ from the normal temperature.
As a further improvement of the invention, a molten iron cooling channel is further arranged beside the square furnace body, and a circulating port is arranged on the furnace wall of the square furnace body and is connected with the molten iron cooling channel. The invention aims to arrange the circulation port close to the lower part of the square furnace body, and is convenient for pouring out high-temperature molten iron.
Drawings
FIG. 1 is a schematic view of an energy efficient rotary hearth furnace system;
FIG. 2 is a schematic view of the structure of a rotary hearth furnace;
fig. 3 is a schematic structural view of the molten iron cooling passage.
In the figure, 1, a rotary hearth furnace body; 11. a square furnace body; 11-1, a burner; 11-2, a gas port; 11-3, a wind supplementing nozzle; 12. a rotating device; 2. a gas cabinet; 3. a briquetting assembly; 4. a gas pipe network; 5. a molten iron cooling channel; 51. a channel body; 52. a heat dissipation housing; 53. and (4) winding the tube.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1:
the embodiment discloses a rotary hearth furnace structure shown in fig. 2, which comprises a square furnace body 11 and a supporting assembly for supporting the square furnace body 11, wherein burners 11-1 are respectively arranged at four corners of the square furnace body 11, gas ports 11-2 are arranged on two faces, which are opposite to the square furnace body 11, and the gas ports 11-2 are positioned at the lower part of the square furnace body 11. As the density of the coal gas is less than that of the air, the coal gas port 11-2 is arranged at the lower part of the square furnace body 11, and the coal gas floats to the top of the furnace hearth after entering the furnace hearth from the coal gas port 11-2, so that the whole furnace hearth is filled with the coal gas, and the furnace hearth is convenient to heat. In the embodiment, the two gas ports 11-2 are oppositely arranged, so that the convection of the gas in the hearth can be prevented, the gas can be quickly paved at the bottom of the whole hearth, and the gas filling material at the bottom of the hearth promotes the air to float upwards, thereby being more beneficial to the combustion at the bottom of the hearth.
In this embodiment, be equipped with in the preferred furnace and be used for dividing into the polylith baffle of different regions with furnace, polylith baffle respectively with furnace's inner wall fixed connection, fixed connection between the polylith baffle has the clearance between the bottom of baffle and furnace. The purpose of having the clearance between baffle and the bottom of furnace is for the gas diffusion of being convenient for each region to this embodiment. Preferably, the hearth is divided into a charging area, a preheating reduction area, a heating reduction area, a high-temperature reduction area and a control reduction area by a plurality of baffles, and two gas ports 11-2 are formed in the inner wall of the high-temperature reduction area.
In the embodiment, the burner 11-1 is preferably located in the middle of the furnace, and the burner 11-1 is installed between two adjacent baffles. In the embodiment, the burner 11-1 is arranged in the middle of the hearth, so that the problem that the burner 11-1 cannot work normally due to the fact that the burner 11-1 is blocked in the hearth during blanking is avoided.
In this embodiment, it is preferable that the lower end of the square furnace body 11 is open, the bottom end of the square furnace body 11 is provided with the rotating device 12, and the upper surface of the rotating device 12 is in contact with the bottom surface of the furnace wall of the square furnace body 11. In this embodiment, the rotating device 12 is provided at the lower end of the square furnace body 11, and the mixture rotates along with the rotating device 12 in the hearth and sequentially passes through the charging area, the preheating reduction area, the heating reduction area, the high-temperature reduction area and the control reduction area, thereby completing the reduction process.
In this embodiment, preferably, at least one air supply nozzle 11-3 is further disposed on the square furnace body 11, the air supply nozzle 11-3 is located at the upper portion of the square furnace body 11, and the air supply nozzles 11-3 and the burners 11-1 are arranged in a staggered manner. In the embodiment, the air supplement nozzle 11-3 is arranged at the upper part of the square furnace body 11, and the air is blown into the air supplement nozzle 11-3 to burn the coal gas, so that heat is provided for the temperature rise and the reduction reaction of the mixture, and the mixture is quickly heated to over 1100 ℃ from the normal temperature.
In this embodiment, it is preferable that the molten iron cooling passage 5 is further provided beside the rectangular furnace body 11, and the furnace wall of the rectangular furnace body 11 is provided with a circulation port connected to the molten iron cooling passage 5. The purpose of arranging the circulation port close to the lower part of the square furnace body 11 in the embodiment is to facilitate pouring out of high-temperature molten iron.
In this embodiment, the process of removing iron in the rotary hearth furnace structure is as follows: charging → heating and raising temperature → reducing → cooling → discharging. The interior of the hearth is divided into a charging area, a preheating reduction area, a heating reduction area, a high-temperature reduction area and a control reduction area. The mixture rotates along with the furnace bottom in the furnace chamber, passes through the zones, completes the reduction process, and then is discharged.
The furnace temperature gradually rises from the preheating reduction zone to the control reduction zone, and the furnace temperature of the control reduction zone is required to reach 1500 ℃.
In each area, heat accumulating type burners 11-1 distributed on two sides of a hearth burn coal gas, air is blown into an air supplementing nozzle 11-3 to burn CO released by a reduction reaction, heat is provided for heating and reducing the mixture, and the mixture is quickly heated to over 1100 ℃ from the normal temperature. In the high-temperature reduction area and the controlled reduction area, the atmosphere in the furnace is accurately controlled by adjusting the amount of the coal gas and the amount of the air of the burner 11-1 so as to achieve the optimal reduction condition.
Example 2:
the hearth temperature of the rotary hearth furnace needs to be increased to about 1350 ℃ to work, and the traditional hearth temperature rising mode adopts fuel to heat the hearth, so that the defects of fuel waste and energy saving are overcome. The energy-saving rotary hearth furnace system of the embodiment adopts surplus coal gas in the blast furnace or the gas chamber 2 to heat the hearth, and the using effect is better.
On the basis of embodiment 1, this embodiment discloses an energy-saving rotary hearth furnace system, as shown in fig. 1, including rotary hearth furnace body 1, gas pipe network 4, briquetting component 3, the inlet end of gas pipe network 4 and gas chamber 2 or blast furnace top, the outlet end of gas pipe network 4 is connected with the furnace of rotary hearth furnace body 1, still be equipped with molten iron cooling channel 5 between briquetting component 3 and rotary hearth furnace body 1. In the embodiment, the raw materials in the rotary hearth furnace are reduced by using the surplus coal gas generated by the gas holder 2 or the blast furnace, so that the consumption of the heating raw materials of the rotary hearth furnace is reduced, and the cost of reducing iron in the rotary hearth furnace is reduced; the purpose of this embodiment set up molten iron cooling channel 5 between briquetting subassembly 3 and rotary hearth furnace body 1 is to reduce the temperature of the inside molten iron of briquetting subassembly 3, protection briquetting subassembly 3's pressure head life.
In this embodiment, it is preferable that a waste heat recovery pipeline is disposed on the molten iron cooling channel 5, a heat inlet end of the waste heat recovery pipeline is connected to the molten iron cooling channel 5, and a heat outlet end of the waste heat recovery pipeline is connected to a hearth of the steel making furnace. The embodiment transfers the heat generated when the molten iron is cooled in the molten iron cooling channel 5 to the steel making furnace through the waste heat recovery pipeline, and the steel making furnace fully utilizes the heat of the molten iron for cooling, thereby reducing the heat of the steel making furnace during steel making.
The energy-saving rotary hearth furnace system of this embodiment still includes the pressure ball room that carries out press forming to the mixture, the low temperature stoving chamber has in the pressure ball room, waste heat recovery pipeline provides the heat source to the low temperature stoving chamber. The embodiment utilizes the heat that produces when the cooling of the iron water of rotary hearth furnace body 1 rear end to dry the mixture in the low temperature stoving chamber, need not other energy supplies just to dry the mixture, has better energy-saving.
In this embodiment, at least one coil pipe 53 is preferably disposed between the outer wall and the inner wall of the molten iron cooling passage 5, and the coil pipe 53 is filled with cooling water. The molten iron cooling channel 5 of this embodiment cools the molten iron in a water cooling manner, and the hot water transferring heat can be used in the whole plant area.
In this embodiment, preferably, the drying device further includes a ball pressing chamber for performing press forming on the mixture, a low-temperature drying chamber is provided in the ball pressing chamber, a heat conducting channel is provided between an inner wall and an outer wall of the low-temperature drying chamber, and the heat conducting channel is communicated with the winding pipe 53 through a connecting pipe.
In this embodiment, preferably, the molten iron cooling channel 5 is made of a refractory material, the outer wall of the molten iron cooling channel 5 is coated with a metal layer, a sealed cavity is formed between the molten iron cooling channel 5 and the metal layer, the tail end of the sealed cavity is connected with the heat inlet end of the waste heat recovery pipeline, and hot steam heated by the sealed cavity flows in the waste heat recovery pipeline. The purpose that this embodiment made molten iron cooling channel 5 by refractory material is to increase molten iron cooling channel 5's durability, increases molten iron cooling channel 5's life, and this embodiment is with waste heat recovery pipeline and sealed chamber sealing connection, and furthest's reduction heat scatters and disappears, has effectively prevented simultaneously that the hot steam in the sealed intracavity from leaking the back injury operating personnel, guarantees outside operating personnel's operation safety.
Example 3:
on the basis of the embodiments 1 and 2, the present embodiment discloses a molten iron cooling channel 5, as shown in fig. 3, including: the molten iron heat recovery device comprises a channel body 51 for flowing molten iron, a heat dissipation shell 52 coated outside the channel body 51, and a water flow channel arranged between the heat dissipation shell 52 and the channel body 51, wherein the tail end of the water flow channel is communicated with a waste heat recovery pipeline. This embodiment sets up heat dissipation shell 52 at the outer wall of passageway body 51, makes to have the clearance between heat dissipation shell 52 and the outer wall of passageway body 51, and this clearance can supply water to flow through, and the water that flows fast absorbs the heat on the outer wall of passageway body 51, makes water become vapor and gets into the waste heat recovery pipeline, carries out reutilization, excellent in use effect to the waste heat of molten iron.
In a preferred embodiment of the present invention, the water passage is at least one bent coiled pipe 53, and the coiled pipe 53 is filled with cooling water. The molten iron cooling channel 5 of this embodiment cools the molten iron in a water cooling manner, and the hot water transferring heat can be used in the whole plant area.
As a preferable mode of this embodiment, the outer wall of the heat dissipation shell 52 is further provided with an anti-scald isolation layer. The purpose of this embodiment is to set up the anti-scalding isolation layer in the outside of heat dissipation shell 52, prevents that the operation personnel from touching heat dissipation shell 52 scald by mistake.
As a preferred mode of this embodiment, the burn-proof insulating layer is made of a fire-resistant material.
As a preferable mode of this embodiment, a sealed cavity is formed between the molten iron cooling passage 5 and the heat dissipation shell 52, the end of the sealed cavity is connected to the heat inlet end of the waste heat recovery pipe, and hot steam heated by the sealed cavity flows in the waste heat recovery pipe. This embodiment is with waste heat recovery pipeline and sealed chamber sealing connection, and furthest's reduction heat scatters and disappears, has effectively prevented simultaneously that the hot steam in the sealed chamber from leaking the back injury operating personnel, guarantees outside operating personnel's operation safety.
In a preferred embodiment of the present invention, the coil pipe 53 is disposed between the molten iron cooling passage 5 and the heat dissipating case 52 in a serpentine shape, the coil pipe 53 is bent and wound on the water inlet side, and the coil pipe 53 is straight on the water outlet side. In the present embodiment, the water inlet side is formed in a zigzag coiled shape in order to rapidly heat the cooling water in the coil pipe 53, and the water outlet side is formed in a linear shape in order to minimize the heat loss of the hot steam in the coil pipe 53, and the hot steam heated by the molten iron is directly introduced into the waste heat recovery pipe.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. The rotary hearth furnace structure for burning blast furnace gas comprises a square furnace body and a supporting assembly for supporting the square furnace body, and is characterized in that burners are arranged at four corners of the square furnace body respectively, gas ports are arranged on two faces, right opposite to the square furnace body, of the square furnace body, and the gas ports are located at the lower portion of the square furnace body.
2. The rotary hearth furnace structure according to claim 1, wherein a plurality of baffles for dividing the hearth into different areas are arranged in the hearth, the plurality of baffles are respectively and fixedly connected with the inner wall of the hearth, the plurality of baffles are fixedly connected with each other, and a gap is formed between each baffle and the bottom of the hearth.
3. The rotary hearth furnace structure according to claim 2, wherein the burners are located in the middle of the hearth, and the burners are installed between two adjacent baffles.
4. A rotary hearth furnace structure according to any one of claims 1 to 3, wherein the lower end of the square furnace body is open, and the bottom end of the square furnace body is provided with a rotary device, and the upper surface of the rotary device is in contact with the bottom surface of the wall of the square furnace body.
5. The rotary hearth furnace structure according to claim 1, wherein at least one air supply nozzle is further arranged on the square furnace body, the air supply nozzle is positioned at the upper part of the square furnace body, and the air supply nozzle and the burners are arranged in a staggered manner.
6. The rotary hearth furnace structure according to claim 1, wherein a molten iron cooling passage is further provided beside the square furnace body, and a circulation port is provided on the furnace wall of the square furnace body, and the circulation port is connected to the molten iron cooling passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579685.4A CN111349737A (en) | 2018-12-24 | 2018-12-24 | Rotary hearth furnace structure for burning blast furnace gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579685.4A CN111349737A (en) | 2018-12-24 | 2018-12-24 | Rotary hearth furnace structure for burning blast furnace gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111349737A true CN111349737A (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811579685.4A Pending CN111349737A (en) | 2018-12-24 | 2018-12-24 | Rotary hearth furnace structure for burning blast furnace gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111349737A (en) |
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2018
- 2018-12-24 CN CN201811579685.4A patent/CN111349737A/en active Pending
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Application publication date: 20200630 |