CN215930526U - Self-service hot air self-supply device for rotary hearth furnace and rotary hearth furnace - Google Patents
Self-service hot air self-supply device for rotary hearth furnace and rotary hearth furnace Download PDFInfo
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- CN215930526U CN215930526U CN202122223536.8U CN202122223536U CN215930526U CN 215930526 U CN215930526 U CN 215930526U CN 202122223536 U CN202122223536 U CN 202122223536U CN 215930526 U CN215930526 U CN 215930526U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a self-service combustion hot air self-supply device for a rotary hearth furnace, and the rotary hearth furnace.A heat exchanger is arranged in a reduction four-zone of the rotary hearth furnace, and hot air after heat exchange in the heat exchanger is conveyed to a combustion-supporting air pipe by utilizing a pressurizing driving mechanism; and then the combustion-supporting air pipes are utilized to convey hot air to all burners of the rotary hearth furnace. The utility model realizes the purpose of self-supply of combustion-supporting hot air by recovering the excess sensible heat in the four reduction areas.
Description
Technical Field
The utility model relates to a metallurgical thermal technology, in particular to a self-help hot air combustion self-supply device for a rotary hearth furnace and the rotary hearth furnace.
Background
The total amount of dust of iron and steel enterprises in China is generally 8% -12% of the steel yield, and if the dust is not properly treated, serious harm is caused to the ecological environment. Under the background of successive issuing of laws and regulations such as clean production law, circular economy promotion law, solid waste pollution environment production law and the like, the rotary hearth furnace process is one of the most effective processes for harmlessly treating metallurgical dust and sludge (extracting zinc and directly reducing sponge iron) at present and is widely used by various large-scale steel enterprises at present.
Taking a rotary hearth furnace with the treatment capacity of 25 ten thousand tons of metallurgical dust and mud in a certain iron and steel enterprise as an example, carbon pellets are distributed in the rotary hearth furnace as raw materials, the dried pellets are uniformly distributed on an annular hearth of the rotary hearth furnace, and sequentially pass through a heating area, a first reduction area, a second reduction area, a third reduction area and a fourth reduction area in the furnace through a furnace bottom driving device, the reduction of iron oxide and zinc oxide is completed in a high-temperature environment of about 1250 ℃, zinc volatilizes into flue gas and is oxidized into zinc oxide powder to be recycled by a dust remover, and the reduced metallized pellets are discharged from a discharge area of the rotary hearth furnace through a high-temperature spiral discharging machine.
The existing rotary hearth furnace process has the following defects:
1) the heat loss between the hot blast stove and the rotary hearth furnace. The high-temperature environment in the rotary hearth furnace needs the hot blast stove to provide combustion-supporting hot air, but the hot blast stove and the rotary hearth furnace are independent equipment units, so that the problems of long pipeline, high energy consumption, large heat loss and the like exist in the production process, and the environmental protection property and the production cost of the rotary hearth furnace process are not facilitated;
2) the problem of excess heat in the four reduction zones. The four reduction zones are positioned at the front parts of the water-cooled retaining wall and the pellet discharge port, the temperature is about 1200 ℃, the improvement effect on the pellet metallization rate and the dezincification rate is not obvious, and the four reduction zones mainly play roles in roasting the pellet strength and heat preservation. However, the temperature of the area is too high at present, and the red ball phenomenon happens occasionally, so that the operation load of subsequent spiral discharging equipment and finished product cooling equipment is too high, and equipment faults are easily caused.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a self-service combustion hot air self-supply device for a rotary hearth furnace and the rotary hearth furnace, so as to recover and reduce the excess sensible heat in the four areas and realize the purpose of self-supply of combustion-supporting hot air.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a self-service hot air self-supply device for a rotary hearth furnace, which comprises a heat exchanger, a pressurizing driving mechanism and a combustion-supporting air pipe, wherein the pressurizing driving mechanism is arranged on the heat exchanger;
the heat exchanger is arranged in a reduction zone IV of the rotary hearth furnace;
the pressurizing driving mechanism is arranged in a reduction four-zone of the rotary hearth furnace and is positioned on the inlet side of the heat exchanger;
and the outlet side of the heat exchanger is communicated with a burner of the rotary hearth furnace through the combustion-supporting air pipe.
Preferably, the distance between the heat exchanger and the hearth of the rotary hearth furnace is within 600 mm.
Preferably, the pressurizing driving mechanism comprises an air box and a variable frequency motor;
the air outlet of the air box faces the heat exchanger, and the variable frequency motor is installed on the air box.
Preferably, the combustion-supporting air pipe is positioned between the furnace burden and the burner of the rotary hearth furnace.
Preferably, the heat exchanger is an air heat exchanger.
The utility model provides a rotary hearth furnace, wherein the self-service combustion hot air self-feeding device for the rotary hearth furnace is arranged in the reduction four areas of the rotary hearth furnace.
The self-service hot air self-supply device for the rotary hearth furnace and the rotary hearth furnace have the following beneficial effects:
1) the method is designed for the rotary hearth furnace, and is compatible and matched with related processes and equipment of the rotary hearth furnace;
2) the self-supply of combustion-supporting hot air required by the rotary hearth furnace is completed by absorbing and reducing the excessive sensible heat of the four areas;
3) the hot air supply of the hot air furnace to the rotary hearth furnace is omitted, and the problems of long pipeline, high energy consumption, large heat loss and the like between the hot air furnace and the rotary hearth furnace are avoided;
4) the reduction of the excess sensible heat in the reduction four areas can reduce the heat load of subsequent spiral discharging equipment and finished product cooling equipment, and the service life of the equipment is prolonged.
Drawings
FIG. 1 is a schematic diagram of the field layout of the self-service hot air self-sufficient device of the present invention;
FIG. 2 is a schematic view in the direction A of FIG. 1;
fig. 3 is a schematic view of direction B in fig. 1.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
Referring to fig. 1 to 3, the self-service hot air supply device for a rotary hearth furnace according to the present invention is arranged as follows:
a heat exchanger 1 is arranged in a reduction four-zone 105 of the rotary hearth furnace 100, and hot air after heat exchange in the heat exchanger 1 is conveyed to a combustion-supporting air pipe 2 by a pressurizing driving mechanism.
And then the combustion-supporting air pipe 2 is utilized to convey hot air to each burner of the rotary hearth furnace 100, so that the self-supply of the combustion-supporting hot air of the rotary hearth furnace 100 is realized.
The distance h between the heat exchanger 1 and the hearth 106 of the rotary hearth furnace 100 is within 600 mm.
The pressurizing driving mechanism comprises an air box 3 and a variable frequency motor 4, an air outlet of the air box 3 is arranged towards the direction of the heat exchanger 1, and the variable frequency motor 4 is arranged on the air box 3 and used for adjusting the air volume of the air box 3.
In the process of reducing metallized pellets and secondary zinc oxide powder in a rotary hearth furnace, the rotary hearth furnace 100 is divided into five temperature zones, and the maximum temperature of each temperature zone is set as follows: the temperature of the heating zone 101 is 1150 deg.C, the temperature of the reduction first zone 102 is 1240 deg.C, the temperature of the reduction second zone 103 is 1260 deg.C, the temperature of the reduction third zone 104 is 1260 deg.C, and the temperature of the reduction fourth zone 105 is 1200 deg.C. The reduction fourth zone 105 is actually a cooling zone, the improvement effect on the pellet metallization rate and the dezincification rate is not obvious, and the phenomenon of excess sensible heat exists, so that the sensible heat in the zone can be recovered to complete the self-supply of combustion-supporting hot air. The heat exchanger 1 is arranged in the four reduction areas 105, the height h from the furnace hearth 106 is about 600mm, the air in the heat exchanger 1 absorbs the excess sensible heat in the four reduction areas 105 to reach 500-800 ℃, and then the variable frequency fan 4 controls the air volume of the air box 3 to send hot air to each burner through the combustion-supporting hot air pipe 2, so that the self-supply of the combustion-supporting hot air of the rotary hearth furnace is realized. In addition, because the air in the heat exchanger 1 absorbs the excess sensible heat, the temperature of the charging materials is relatively reduced, and the heat load of the subsequent spiral discharging equipment and finished product cooling equipment is reduced.
The utility model provides a self-service hot air self-supply device for a rotary hearth furnace, which comprises a heat exchanger 1, a pressurizing driving mechanism and a combustion-supporting air pipe 2.
The heat exchanger 1 is arranged in the four reduction zones 105 of the rotary hearth furnace 100, and the pressurizing driving mechanism is arranged in the four reduction zones 105 of the rotary hearth furnace 100 and is positioned at the inlet side of the heat exchanger 1.
The outlet side of the heat exchanger 1 is communicated with each burner of the rotary hearth furnace 100 through a combustion-supporting air pipe 2.
The height h of the heat exchanger and the hearth 106 of the rotary hearth furnace 100 is about 600mm, the sensible heat in the four reduction areas 105 is absorbed by normal temperature air introduced by the variable frequency fan 4, and then combustion-supporting hot air at about 500-800 ℃ is sent to the burner through the combustion-supporting hot air pipe 2, so that the self-supply of the combustion-supporting hot air of the rotary hearth furnace is realized.
The heat exchanger adopts an air heat exchanger.
In conclusion, the self-service combustion hot air self-supply device recovers and reduces the excessive sensible heat in the four areas, and self-supply of combustion-supporting hot air is realized; the dependence of the rotary hearth furnace on the hot air of the hot blast furnace is eliminated, and the problems of long pipeline, high energy consumption, large heat loss and the like between the hot blast furnace and the rotary hearth furnace are avoided; the temperature of finished pellets in the reduction zone IV is effectively reduced, the red ball phenomenon is avoided, and the heat load of spiral discharging and finished product cooling equipment is reduced. The following problems are also solved:
1) the defects of high energy consumption, long pipeline and low heat efficiency of the current front rotary hearth furnace process equipment are overcome;
2) the surplus heat in the reduction four areas can be effectively utilized to complete the self-supply of combustion-supporting hot air in the rotary hearth furnace;
3) the temperature in the four reduction areas can be effectively reduced, and the heat load of subsequent spiral discharging and finished product cooling equipment is reduced.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a self-service hot-blast self-supporting device that burns for rotary hearth furnace which characterized in that: comprises a heat exchanger, a pressurizing driving mechanism and a combustion-supporting air pipe;
the heat exchanger is arranged in a reduction zone IV of the rotary hearth furnace;
the pressurizing driving mechanism is arranged in a reduction four-zone of the rotary hearth furnace and is positioned on the inlet side of the heat exchanger;
and the outlet side of the heat exchanger is communicated with a burner of the rotary hearth furnace through the combustion-supporting air pipe.
2. The self-sustaining hot air supply apparatus for a rotary hearth furnace according to claim 1, wherein: the distance between the heat exchanger and the hearth of the rotary hearth furnace is within 600 mm.
3. The self-sustaining hot air supply apparatus for a rotary hearth furnace according to claim 1, wherein: the pressurizing driving mechanism comprises an air box and a variable frequency motor;
the air outlet of the air box faces the heat exchanger, and the variable frequency motor is installed on the air box.
4. The self-sustaining hot air supply apparatus for a rotary hearth furnace according to claim 1, wherein: and the combustion-supporting air pipe is positioned between the furnace burden and the burner of the rotary hearth furnace.
5. The self-sustaining hot air supply apparatus for a rotary hearth furnace according to claim 1, wherein: the heat exchanger is an air heat exchanger.
6. A rotary hearth furnace is characterized in that: the self-combustion hot air self-supply device for the rotary hearth furnace is arranged in the reduction four areas of the rotary hearth furnace according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122223536.8U CN215930526U (en) | 2021-09-13 | 2021-09-13 | Self-service hot air self-supply device for rotary hearth furnace and rotary hearth furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122223536.8U CN215930526U (en) | 2021-09-13 | 2021-09-13 | Self-service hot air self-supply device for rotary hearth furnace and rotary hearth furnace |
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| Publication Number | Publication Date |
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| CN215930526U true CN215930526U (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122223536.8U Active CN215930526U (en) | 2021-09-13 | 2021-09-13 | Self-service hot air self-supply device for rotary hearth furnace and rotary hearth furnace |
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| CN (1) | CN215930526U (en) |
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2021
- 2021-09-13 CN CN202122223536.8U patent/CN215930526U/en active Active
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