CN210656993U - Device for continuously producing molten iron - Google Patents
Device for continuously producing molten iron Download PDFInfo
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- CN210656993U CN210656993U CN201921695053.4U CN201921695053U CN210656993U CN 210656993 U CN210656993 U CN 210656993U CN 201921695053 U CN201921695053 U CN 201921695053U CN 210656993 U CN210656993 U CN 210656993U
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Abstract
The utility model relates to a device for continuously producing molten iron, which comprises a coal-based shaft furnace, a high-temperature rotary kiln, a transmission system and a molten iron system. The transmission system is arranged on the periphery of a kiln body of the high-temperature rotary kiln to control the rotation of the high-temperature rotary kiln, the molten iron system comprises two molten iron tanks, a support and an iron casting machine, the two molten iron tanks are arranged on the support, the two molten iron tanks can rotate by taking a support supporting point as a circle center, and a feed inlet of the iron casting machine faces a discharge hole of one of the molten iron tanks, and the high-temperature rotary kiln is characterized in that: the discharge port of the coal-based shaft furnace is connected with the feed port of the high-temperature rotary kiln, and the discharge port of the high-temperature rotary kiln is opposite to the feed port of one of the hot metal ladles. The utility model discloses a sintering and coking and blast furnace are got rid of to the device, adopt ripe coal base shaft furnace and modified rotary kiln to combine together, form one set and use iron ore or cold consolidation fine iron powder pelletizing and anthracite as the continuous production molten iron device of main raw and other materials, owing to there is not sintering-coking-blast furnace, can reduce dust and waste gas in a large number, are favorable to environmental protection.
Description
Technical Field
The utility model relates to a device for continuously producing molten iron.
Background
As is well known, in ferrous metallurgy, blast furnaces are the key equipments for producing molten iron in most steel mills, and there are many enterprises in the world, and research units research new molten iron production processes and equipments, such as: COREX-3000 smelting reduction engineering, Hlsmelt and other iron-smelting methods and equipment. The exploration of new environment-friendly iron-making processes and equipment is the key point of current research in all countries. In blast furnace iron making, three key processes are necessary: sintering-coking-blast furnace, which are the most serious pollution procedures in the steel industry.
Disclosure of Invention
The utility model aims at overcoming the problems in the prior art and providing a device for continuously producing molten iron. The utility model discloses a sintering and coking and blast furnace are got rid of to the device, adopt ripe coal base shaft furnace and modified rotary kiln to combine together, form one set and use iron ore or cold consolidation fine iron powder pelletizing and anthracite as the device of the main raw and other materials continuous production molten iron, owing to there is not sintering-coking-blast furnace, can reduce dust and waste gas in a large number, are favorable to environmental protection.
The technical scheme of the utility model is that:
a device for continuously producing molten iron comprises a coal-based shaft furnace, a high-temperature rotary kiln, a transmission system and a molten iron system. The transmission system is arranged on the periphery of a kiln body of the high-temperature rotary kiln to control the rotation of the high-temperature rotary kiln, the molten iron system comprises two molten iron tanks, a support and an iron casting machine, the two molten iron tanks are arranged on the support, the two molten iron tanks can rotate by taking a support supporting point as a circle center, and a feed inlet of the iron casting machine faces a discharge hole of one of the molten iron tanks, and the high-temperature rotary kiln is characterized in that: the discharge port of the coal-based shaft furnace is connected with the feed port of the high-temperature rotary kiln, and the discharge port of the high-temperature rotary kiln is opposite to the feed port of one of the hot metal ladles.
The coal-based shaft furnace consists of a furnace body, a feeding bin, a coal gas heater and a heat discharger, wherein the feeding bin is arranged at the top of the furnace body, the coal gas heater is arranged at the periphery of a reaction area in the middle of the furnace body, a discharge hole at the bottom of the furnace body is connected with a feed inlet of the heat discharger, and a discharge hole of the heat discharger is connected with a feed inlet of the high-temperature rotary kiln.
The high-temperature rotary kiln comprises a kiln body and a pulverized coal burner, wherein the kiln body consists of a steel plate layer, an aluminum silicate fiber felt layer, a high-aluminum light brick layer, a high-aluminum refractory brick layer and an electric smelting magnesia ramming layer from outside to inside in sequence, the pulverized coal burner is arranged at a discharge port at the tail part of the kiln body and is used for supporting combustion by preheated air and rich (26-35%) O2, the flame length is 1.5-2.5 m, and the high temperature of the discharge port at the tail part of the kiln body reaches 1500-1600 ℃ through the pulverized coal burner.
The thickness of the steel plate layer is 10-30 mm, the thickness of the aluminum silicate fiber felt layer is 20-40 mm, the thickness of the high-aluminum light brick layer is 20-40 mm, the thickness of the high-aluminum refractory brick layer is 20-40 mm, and the thickness of the fused magnesia ramming layer is 40-60 mm.
The inner diameter of the kiln body is 800-2000mm, and the length of the kiln body is 10-20 m.
The inclination of the kiln body is 1/100-5/100.
The transmission system is a variable frequency motor speed reducer, and the variable frequency motor speed reducer is used for controlling the rotating speed of the rotary kiln to adjust the flow of molten iron.
The improved high-temperature rotary kiln comprises: 1. the inner diameter is 800-2000mm, the length is 10-20m, 2. the heating high-temperature area is controlled in the range of 1.5-3.5m of the kiln body tail discharge opening, 3. the section of the discharge end is reduced, one coal powder spraying burner is arranged at the kiln body tail discharge opening, the preheating air and rich (26-35%) O2 are used for supporting combustion, the flame length is 1.5-2.5 m, and the kiln body tail discharge opening reaches the high temperature of 1500-1600 ℃; sponge iron produced by the coal-based shaft furnace and residual reducing agent enter the kiln body from the feed end of the kiln body through a hot discharger, are further reduced and carburized in the kiln body at high temperature, and are melted at the discharge end of the kiln body by 1.5-3.5m to produce molten iron; molten iron flows into the two molten iron tanks at intervals through the chute and is cast into iron blocks by the pig casting machine, so that all-weather continuous production is realized.
When the coal-based shaft furnace is used for production, sintered ore and coke are not needed, only iron ore or cold-bonded fine iron powder pellets and anthracite are needed, carbon dioxide generated during reduction is only 1/2 of that of a blast furnace, the heat energy of exhaust smoke is recycled, the used anthracite is a raw material for manufacturing active carbon, no solid waste is generated, and the device is a very environment-friendly device for producing sponge iron by a reduction method; the device is used for large-scale production and operation, the direct reduction rotary kiln is also a common reduction device, but because the kiln body is very long (usually about 80 m), the temperature in the kiln is about 1200 ℃, most of the rings are formed in the middle of the kiln body, so that the rotary kiln is not easy to continuously operate for a long time, the device modifies the traditional direct reduction rotary kiln, controls the length to be 10-20m, controls the heating high-temperature region to be within a certain range of 1.5-3.5m, reduces the section of the discharge end, is provided with one pulverized coal injection burner at the discharge port at the tail of the kiln body, uses preheated air and rich (26-35%) O2 to support combustion, has the flame length of 1.5-2.5 m, enables the discharge port at the tail of the kiln body to reach the high temperature of 1500-1600 ℃, sponge iron and residual reducing agent produced by the coal-based shaft furnace enter the furnace from the feed end through a thermal discharger, are further reduced and carburized in the furnace through the high temperature, are melted at the discharge port at the tail, molten iron flows into the two molten iron tanks at intervals through the chute and is cast into iron blocks by the pig casting machine, so that all-weather continuous production is realized.
Drawings
Fig. 1 is a schematic view of the present invention.
Fig. 2 is a schematic structural view of the rotary kiln of the present invention.
Detailed Description
The structure attached figures further describe the utility model. The furnace body, the feeding bin, the gas heater, the heat discharger, the transmission system, the hot metal ladle and the pig casting machine of the utility model are of the prior structure.
As shown in figure 1 and figure 2, the utility model discloses a device for continuous production of molten iron, including coal-based shaft furnace, high temperature rotary kiln, transmission system, molten iron system, transmission system installs in high temperature rotary kiln's kiln body 4 periphery, controls the rotation of high temperature rotary kiln, transmission system is the inverter motor speed reducer, controls the rotary kiln with the inverter motor speed reducerThe molten iron flow is adjusted to the rotational speed, rotational speed 2r/min, the molten iron system comprises two hot metal bottle 5, support 6, pig machine 7, and two hot metal bottle 5 are installed on support 6, and two hot metal bottle 5 can use support 6 strong point as the centre of a circle rotatory, and the feed inlet of pig machine 7 faces one of them hot metal bottle 5 discharge gate, its characterized in that: the discharge hole of the coal-based shaft furnace is connected with the feed inlet of the high-temperature rotary kiln, and the discharge hole of the high-temperature rotary kiln is opposite to the feed inlet of one of the hot metal ladles 5. The coal-based shaft furnace consists of a furnace body 1, a feeding bin, a coal gas heater 2 and a heat discharger 3, wherein the feeding bin is arranged at the top of the furnace body 1, the coal gas heater 2 is arranged at the periphery of a reaction area in the middle of the furnace body 1, a discharge hole at the bottom of the furnace body 1 is connected with a feed inlet of the heat discharger 3, and a discharge hole of the heat discharger 3 is connected with a feed inlet of a high-temperature rotary kiln; as shown in figure 2, the high-temperature rotary kiln comprises a kiln body 4 and a pulverized coal burner 9, wherein the kiln body 4 sequentially comprises a steel plate layer 4-1, an aluminum silicate fiber felt layer 4-2, a high-aluminum light brick layer 4-3, a high-aluminum refractory brick layer 4-4 and an electric smelting magnesia ramming layer 4-5 from outside to inside, the pulverized coal burner 9 is installed at a discharge port at the tail part of the kiln body 4, in figure 1, 10 is a combustion fan, 11 is a smoke exhaust system, and is matched equipment provided for a heat exchanger which is preheated air, the heat exchanger, the combustion fan and the smoke exhaust system are all of the conventional structure, and the preheated air and 26-35% O are used2Combustion supporting, the flame length is 1.5-2.5 m, and the high temperature of the discharge hole at the tail part of the kiln body reaches 1500-1600 ℃ through a pulverized coal burner 9. The thickness of the steel plate layer is 20mm, the thickness of the aluminum silicate fiber felt layer is 30mm, the thickness of the high-alumina light brick layer is 30mm, the thickness of the high-alumina refractory brick layer is 30mm, and the thickness of the fused magnesia ramming layer is 50 mm. The inner diameter of the kiln body is 1500mm, the length of the kiln body is 12m, and the inclination of the kiln body is 1.5/100.
Sponge iron produced by the coal-based shaft furnace and residual reducing agent enter the kiln body from the feed end of the kiln body through a hot discharger, are further reduced and carburized in the kiln body at high temperature, and are melted at the discharge end of the kiln body by 1.5-3.5m to produce molten iron; molten iron flows into the two molten iron tanks at intervals through the chute and is cast into an iron block 8 by an iron casting machine, thereby realizing all-weather continuous production.
When the coal-based shaft furnace is used for production, sintered ore and coke are not needed, only iron ore or cold-bonded fine iron powder pellets and anthracite are needed, carbon dioxide generated during reduction is only 1/5 of that of a blast furnace, the heat energy of exhaust smoke is recycled, the used anthracite is a raw material for manufacturing active carbon, no solid waste is generated, and the device is a very environment-friendly device for producing sponge iron by a reduction method; the device is used for large-scale production and operation, the direct reduction rotary kiln is also a common reduction device, but because the kiln body is very long (usually about 80 m), the temperature in the kiln is about 1200 ℃, most of the ring formation phenomenon appears in the middle part of the kiln body, so that the rotary kiln is not easy to continuously operate for a long time, the device modifies the traditional direct reduction rotary kiln, controls the length to be 10-20m, controls the heating high-temperature area to be within a certain range of 1.5-3.5m, reduces the section of a discharge end, is provided with a pulverized coal injection burner at a discharge port at the tail part of the kiln body, uses preheated air and 26-35% enriched O2 to support combustion, has the flame length of 1.5-2.5 m, enables the discharge port at the tail part of the kiln body to reach the high temperature of 1500-1600 ℃, sponge iron and residual reducing agent produced by a coal-based shaft furnace enter the furnace from a feed end through a thermal discharger, are further reduced and carburized in the furnace through the high temperature, are melted at the discharge port at the tail part, molten iron flows into the two molten iron tanks at intervals through the chute and is cast into iron blocks by the pig casting machine, so that all-weather continuous production is realized.
Coal-based shaft furnace process parameters
Coal-based shaft furnace
Raw materials: iron oxide blocks/pellets (C0-10%) + anthracite/coke powder (30%) + CaCO3 (8-15%)
The reduction temperature is 1000-1200 ℃, and the reduction lasts 8-15 h;
the metallization rate of the sponge iron is 85-95%;
the hot discharge temperature is 500-850 DEG C
Continuous hot discharge mode
1-30 ten thousand tons of sponge iron pellets are produced in a coal-based shaft furnace every year.
Second, the structural parameters of the rotary kiln
Improved high-temperature rotary kiln
1. The inner diameter is 800-2000mm, and the length is 10-20 m;
2. the kiln body structure is characterized in that a shell is formed by welding 20mm steel plates, and the kiln body is composed of a 20mm steel plate layer, a 30mm aluminum silicate fiber felt layer, a 30mm high-alumina light brick layer (axe brick layer), a 30mm high-alumina refractory brick layer (knife edge brick layer), and a 50mm fused magnesia ramming layer (working layer).
3. The diameter of a kiln head feed inlet is 500-800mm, and the diameter of a kiln tail discharge outlet is 600-1000mm
4. The kiln tail discharge opening is provided with one coal powder spraying burner, preheated air and 26-35% enriched O2 are used for supporting combustion, the kiln tail discharge opening is enabled to reach the high temperature of 1500-1600 ℃,
5. kiln inclination 1/100-5/100 left and right (adjustable)
6. And controlling the rotary kiln rotation speed by using a variable frequency motor speed reducer to adjust the flow of molten iron.
The operation method comprises the following steps:
mixing iron oxide blocks/pellets containing C (0-10%), anthracite/coke powder and CaCO3 particles, adding into a shaft furnace from the top of a coal-based shaft furnace for reduction, and controlling the reduction temperature to be 1000-1200 DEG C
Adjusting the discharging speed of a hot discharger, controlling the reduction time to be 8-15h, the hot discharging temperature to be 500-850 ℃, and the metallization rate of sponge iron to be 85-95%;
3. adjusting a kiln tail tapping/slag hole pulverized coal spraying burner, using preheated air and 26-35% enriched O2 for combustion supporting, enabling the kiln tail tapping/slag hole to reach a high temperature of 1500-1600 ℃, adjusting the inclination of the kiln body of the rotary kiln to be 1/100-5/100 according to the molten iron flow condition, controlling the rotary kiln rotation speed by using a variable frequency motor speed reducer, and adjusting the molten iron flow.
Molten iron and slag respectively flow into two molten iron tanks at intervals through a chute, the two molten iron tanks alternately receive the molten iron and the slag, when one molten iron tank receives the molten iron and the slag is full, the other molten iron tank starts to receive the molten iron and the slag, and the molten iron is injected into an iron casting machine to be cast into iron blocks after the slag is discharged from the former molten iron tank. The two hot metal ladles are alternately operated, thereby realizing all-weather continuous production.
Application example:
1. containing C2% iron oxide (TFe 67%) pellets, 45% anthracite, CaCO3 (10%) and mixing
2.50000 t/y coal-based shaft furnace process parameters: the reduction temperature is 1150 ℃, the reduction time is 12 hours, the hot discharging temperature is 650 ℃, the metallization rate of the sponge iron is 93 percent, and the quantity of C is 1.1 percent and 5.7 t/hour;
3. the technological parameters of the rotary kiln are that the inner diameter of the kiln is 1500mmx, the length is 12000mm, the inclination is 1.5/100, the rotating speed is 2r/min, the preheating temperature of combustion air is 420 ℃, the oxygen-enriched concentration is 30 percent, the granularity of coal powder is-200 meshes, and the discharge/slag hole at the tail of the kiln is 1520 ℃;
4. the molten iron tank has 30 tons and 2 pieces, and the molten iron is 5t/h and 120 t/day.
5. The iron blocks comprise Fe96.5%, C2.4%, Si 0.5%, and the rest.
Claims (7)
1. The utility model provides a device of continuous production molten iron, includes coal-based shaft furnace, high temperature rotary kiln, transmission system, molten iron system, and transmission system installs in the kiln body periphery of high temperature rotary kiln, controls the rotation of high temperature rotary kiln, the molten iron system comprises two hot metal jars, support, pig machine, and two hot metal jars are installed on the support, and two hot metal jars can use the support strong point to rotate as the centre of a circle, and the feed inlet of pig machine faces one of them hot metal jar discharge gate, its characterized in that: the discharge port of the coal-based shaft furnace is connected with the feed port of the high-temperature rotary kiln, and the discharge port of the high-temperature rotary kiln is opposite to the feed port of one of the hot metal ladles.
2. The apparatus for continuously manufacturing molten iron according to claim 1, wherein: the coal-based shaft furnace consists of a furnace body, a feeding bin, a coal gas heater and a heat discharger, wherein the feeding bin is arranged at the top of the furnace body, the coal gas heater is arranged at the periphery of a reaction area in the middle of the furnace body, a discharge hole at the bottom of the furnace body is connected with a feed inlet of the heat discharger, and a discharge hole of the heat discharger is connected with a feed inlet of the high-temperature rotary kiln.
3. The apparatus for continuously manufacturing molten iron according to claim 1 or 2, wherein: the high-temperature rotary kiln comprises a kiln body and a pulverized coal burner, wherein the kiln body consists of a steel plate layer, an aluminum silicate fiber felt layer, a high-aluminum light brick layer, a high-aluminum refractory brick layer and an electric smelting magnesia ramming layer from outside to inside in sequence, and the pulverized coal burner is arranged at a discharge outlet at the tail part of the kiln body.
4. The apparatus for continuously manufacturing molten iron according to claim 3, wherein: the thickness of the steel plate layer is 10-30 mm, the thickness of the aluminum silicate fiber felt layer is 20-40 mm, the thickness of the high-aluminum light brick layer is 20-40 mm, the thickness of the high-aluminum refractory brick layer is 20-40 mm, and the thickness of the fused magnesia ramming layer is 40-60 mm.
5. The apparatus for continuously manufacturing molten iron according to claim 4, wherein: the inner diameter of the kiln body is 800-2000mm, and the length of the kiln body is 10-20 m.
6. The apparatus for continuously manufacturing molten iron according to claim 4, wherein: the inclination of the kiln body is 1/100-5/100.
7. The apparatus for continuously manufacturing molten iron according to claim 4, wherein: the transmission system is a variable frequency motor reducer.
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| CN201921695053.4U CN210656993U (en) | 2019-10-11 | 2019-10-11 | Device for continuously producing molten iron |
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| CN201921695053.4U CN210656993U (en) | 2019-10-11 | 2019-10-11 | Device for continuously producing molten iron |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115216574A (en) * | 2022-01-25 | 2022-10-21 | 中冶长天国际工程有限责任公司 | Direct reduction process and direct reduction device for iron-containing composite pellets |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115216574A (en) * | 2022-01-25 | 2022-10-21 | 中冶长天国际工程有限责任公司 | Direct reduction process and direct reduction device for iron-containing composite pellets |
| CN115216574B (en) * | 2022-01-25 | 2023-10-03 | 中冶长天国际工程有限责任公司 | Direct reduction process and direct reduction device for iron-containing composite pellets |
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