CN105441620A - Coal-based direct reduction furnace and reduction method - Google Patents
Coal-based direct reduction furnace and reduction method Download PDFInfo
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- CN105441620A CN105441620A CN201610003045.3A CN201610003045A CN105441620A CN 105441620 A CN105441620 A CN 105441620A CN 201610003045 A CN201610003045 A CN 201610003045A CN 105441620 A CN105441620 A CN 105441620A
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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
Abstract
The invention relates to a coal-based direct reduction furnace which comprises at least two groups of modules consisting of rectangular reduction chambers and combustion chambers, and further comprises a discharge device, wherein each reduction camber is composed of a pre-heating section and a reduction section; each combustion chamber is composed of a heating section and a combustion section; and the discharge device is arranged below the reduction sections. A reduction method is characterized in that metal-containing raw materials are uniformly mixed with a reducing agent after being subjected to pelletizing; mixed materials are reduced in the pre-heating sections and the reduction sections; and finally, the mixed materials are cooled at the cooling sections below the reduction sections, and then are continuously or discontinuously discharged by virtue of the discharge device; heat generated in the combustion chambers passes through a refractory partition wall for heating the mixed materials in the reduction chambers, so that the metal-containing raw materials are reduced; and heated smoke gas at the reduction sections continuously heats the mixed materials in the pre-heating sections after passing through the heating sections. The coal-based direct reduction furnace is sufficient in energy source utilization, high in modularized combination production efficiency and uniform in temperature, and has remarkable advantages of being strong in raw fuel adaptation, low in energy consumption, good in product quality, high in yield, low in investment and the like.
Description
Technical field
The present invention relates to the technical field of metal pyrometallurgical smelting, be specifically related to the method for reducing that a kind of tube reduction furnace and this tube reduction furnace adopt.
Background technology
Produce the Direct Reduction Technology of sponge iron at present both at home and abroad, according to reductive agent kind, have gas base and coal-based two large classes, gas base mainly contains MIDREX (Mead rex method), HYL (Xi Erfa) etc.; Coal-basedly mainly contain kiln process, rotary hearth furnace method, outer thermal response tank method etc.All there is respective deficiency in above technology, gas-based reduction technology needs the shortcomings such as the reducing gas resource of high-quality ensures, reduction process is difficult to control, high to ingredient requirement, investment is large, working cost is high; Coal-based Direct Reduction Technologies all exists that ingredient requirement is high, energy consumption is large, output is little, reduction process is difficult to control, operating rate is low, equipment is difficult to the shortcomings such as maximization, just based on above various reasons, in current world wide, the popularization of direct-reduction is restricted, and ultimate production is also little.
Current coal-based direct reduction mainly contains rotary hearth furnace, rotary kiln, tunnel furnace etc., and these Direct Reduction Technologies concrete shortcoming is separately as follows:
(1) there is siege and circling always in rotary hearth furnace, siege is constantly in the working cycle of heating, cooling, bring the resistance to material of a body fragile, reduce that its life-span, bed structure part are yielding, reducing atmosphere is difficult to control, resultant metal rate is low, energy consumption is high, output is subject to technical limitation, be difficult to the shortcomings such as maximization;
(2) shortcomings such as rotary kiln exists easy ring formation in kiln, reduction zone difficult control of temperature, operational difficulty, energy consumption is high, unstable product quality, reduction effect are poor;
(3) unstable, the artificial loading pot labour intensity of the mechanized handling tank of tunnel furnace is very large, environmental protection is poor, retort is in intensification temperature-fall period repeatedly and causes tank body life-span low, the shortcoming such as energy consumption is high, yield poorly.
Newly occurred a kind of coal-based shaft furnace technology in recent years, the patent No. is CN200620095509.X, and this is a kind of external combustion tube type coal-based direct reduction shaft furnace, and feature is that this technology exists following problem containing several oblong respective independently retort in shaft furnace:
(1) reducing space is independently retort one by one, and annual production is subject to serious restriction, can not realize the large-scale production of wall scroll production line more than 300,000 tons;
(2) the resistance to material of retort requires high, restricted lifetime, causes that investment is large, cost is high;
(3) combustion chamber is random space, and the temperature field of each retort is uneven, causes energy consumption height and quality product easily to occur difference.
Summary of the invention
Goal of the invention of the present invention is; provide the method for reducing that a kind of tube reduction furnace and this tube reduction furnace adopt, this technical scheme has raw material wide accommodation, resultant metal rate is high, energy consumption is low, output is large, can accomplish scale production, invest the remarkable advantages such as low.
The technical solution adopted in the present invention is as follows:
A kind of tube reduction furnace, described tube reduction furnace comprises the module that at least two groups are made up of reduction room and the combustion chamber of rectangle, described reduction room is made up of upper and lower two portions, be respectively preheating section and reduction section, described tube reduction furnace also comprises the discharge device be arranged at for continuous or discontinuous discharge below described reduction section.
Preferably, the cross section of described preheating section, described reduction section horizontal direction is rectangle, width is 300 ~ 600mm, length is 3000 ~ 12000mm, the cross section of described preheating section, described reduction section vertical direction is all rectangle or trapezoidal, described preheating section height is 3000 ~ 6000mm, and described reduction section height is 4000 ~ 8000mm.
Described combustion chamber is made up of upper and lower two portions, is respectively heating zone and burning zone.
Preferably, two or more burner is provided with in described burning zone.
Preferably, the cross section of described heating zone, burning zone horizontal direction is rectangle, and width is 100 ~ 400mm, and length is 3000 ~ 12000mm, the cross section of described heating zone, burning zone vertical direction is all rectangle or trapezoidal, is highly respectively 3000 ~ 6000mm, 4000 ~ 8000mm.
The method of reducing of above-mentioned tube reduction furnace is adopted to be:
Metalliferous feed material mixes with reductive agent after pelletizing, mixing material carries out heating and reducing in described preheating section and described reduction section, in whole heating and reduction process, mixing material is slowly downward continuous motion or discontinuous motion, finally realize continuously or discontinuous discharge through discharge device after cooling section cooling below described reduction section, after the coal gas of high temperature that described reduction section produces participates in reduction reaction, be up to preheating section and continue heating and reduction mixing material.
The high-temperature flue gas that described burning zone produces first by the mixing material of partition wall heat reduction section, then is up to heating zone heats described preheating section mixing material by partition wall.
The coal gas of discharging from described preheating section is as the fuel of combustion chamber.
The flue gas of discharging from described heating zone is used for fuel described in preheating needed for burning zone and/or combustion air, and is used for dry containing metal pelletizing.
Preferably, described reduction section bottom arrange cooling section the high temperature mixing material after reduction is cooled to 50 ~ 100 DEG C or 500 ~ 900 DEG C after continuously or be interrupted and discharge.
Implement Coal-based Direct Reduction Technologies of the present invention, there is following beneficial effect:
1. adopt Coal-based Direct Reduction Technologies of the present invention, can realize high yield and large-scale production, reason is: reduction room is elongated rectangular configuration, and the volume of single reduction room is large, and the inventory be reduced stored in a reduction chamber unit is large; Reduction room and two, combustion chamber unit can carry out modular combination, by combining a lot of reduction rooms and combustion chamber unit realizes high yield and large-scale production.
2. reduction room is divided into preheating section, reduction section, and accessible effect has: reduced material is before reduction, and have passed through sufficient preheating, heat is utilized effectively, and the efficiency of reduction is improved; Reduced material adopts slowly downward continuous motion or discontinuous motion in reduction process, to avoid the bonding of material in reduction room, is unlikely to cause discharge difficulty and breaks in production.
3. it is independent separately to reduce room and combustion chamber, respective reducing atmosphere and oxidizing atmosphere non-interference, can uniform temperature fields be realized, the product of high degree of metalization can be obtained.
4. metalliferous feed material and reductive agent powder are in dispersion, equally distributed state in reduction room, and accessible effect has: reductive agent fully contacts with metalliferous feed material, improves reduction efficiency; Metalliferous feed material is in the reductive agent powder of rarefaction, fully can eliminate the expansion of granular feedstock in reduction process, and overall material, to the unstressed effect of reduction room partition wall, extends reduction furnace bulk life time.
5. the combustion chamber high-temperature flue gas of finally discharging adopts high-temperature heat exchanger to carry out heat recuperation, is used for preheating to enter the combustion air of combustion chamber, improves reducing furnace system thermo-efficiency.
6. the reducing gas that the room preheating section that reduces is discharged is back to combustion chamber recycling, can save energy.
7. arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient.
8., by regulating chamber temperature to control reduction chambers temp, therefore, this reduction technique can realize the direct-reduction of multiple different metal raw material, can process raw metal scope wide.
Accompanying drawing explanation
Fig. 1 is the elevational schematic view of tube reduction furnace of the present invention;
Fig. 2 is the floor map of tube reduction furnace of the present invention.
Embodiment
In order to make technical solution of the present invention be easier to understand, the existing mode adopting specific embodiment by reference to the accompanying drawings, carries out clear, complete description to technical scheme of the present invention.It should be noted that, embodiment described herein is only section Example of the present invention, but not whole implementation of the present invention, described embodiment only has exemplary, its effect is only to understand the more simple and clear mode of content of the present invention for auditor and the public provide, instead of the restriction to technical scheme of the present invention.Without departing from the inventive concept of the premise, all those of ordinary skill in the art do not make creative work just other embodiment thinkable, and other is to the simple replacement of technical solution of the present invention and various change, all belongs to protection scope of the present invention.
Embodiment 1
As shown in Figure 1, tube reduction furnace of the present invention comprises 4 reduction room (1) and 3 combustion chambers (2), reduction room (1) and combustion chamber (2) is arranged by partition wall interval, form the structure sharing a combustion chamber (2) between two reduction room (1), shown partition wall is high temperature resistant, anti-oxidation, anti-reduction and the anti abrasive partition wall of resistance to material; Reduction room (1) is made up of upper and lower two portions, is respectively preheating section (3) and reduction section (4); Combustion chamber (2) upper and lower two portions are respectively heating zone and burning zone; Reduction room (1) top of this tube reduction furnace is provided with opening for feed, and reduction section (4) below is provided with cooling section (5) and discharge device (6); Two burners are set in the burning zone of combustion chamber (2) bottom.
Reduction room (1) and the combustion chamber (2) of this tube reduction furnace are all rectangular parallelepiped, reduction room (1) width is 300mm, and length is 3000mm, wherein, preheating section (3) is highly 3000mm, and reduction section (4) is highly 4000mm; Combustion chamber (2) width is 100mm, and length is 3000mm, and wherein, heating zone height is 3000mm, and burning zone height is 4000mm.
The effect that Coal-based Direct Reduction Technologies of the present invention reaches: reduction room and two, combustion chamber unit can carry out modular combination, by combining a lot of reduction rooms and combustion chamber unit realizes high yield and large-scale production; Reduction room is divided into preheating section, reduction section, and reduced material is before reduction, and have passed through sufficient preheating, heat is utilized effectively, and the efficiency of reduction is improved; Reduction room and combustion chamber are independent separately, respective reducing atmosphere and oxidizing atmosphere non-interference, can uniform temperature fields be realized, the product of high degree of metalization can be obtained; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient.
Embodiment 2
As shown in Figure 1, tube reduction furnace of the present invention comprises 4 reduction room (1) and 3 combustion chambers (2), reduction room (1) and combustion chamber (2) is arranged by partition wall interval, form the structure sharing a combustion chamber (2) between two reduction room (1), shown partition wall is high temperature resistant, anti-oxidation, anti-reduction and the anti abrasive partition wall of resistance to material; Reduction room (1) is made up of upper and lower two portions, is respectively preheating section (3) and reduction section (4); Combustion chamber (2) upper and lower two portions are respectively heating zone and burning zone; Reduction room (1) top of this tube reduction furnace is provided with opening for feed, and reduction section (4) below is provided with cooling section (5) and discharge device (6).
Reduction room (1) and the combustion chamber (2) of this tube reduction furnace are all rectangular parallelepiped, reduction room (1) width is 400mm, and length is 6000mm, wherein, preheating section (3) is highly 3000mm, and reduction section (4) is highly 6000mm; Combustion chamber (2) width is 200mm, and length is 6000mm, and wherein, heating zone height is 3000mm, and burning zone height is 6000mm.
The effect that Coal-based Direct Reduction Technologies of the present invention reaches: reduction room and two, combustion chamber unit can carry out modular combination, by combining a lot of reduction rooms and combustion chamber unit realizes high yield and large-scale production; Reduction room is divided into preheating section, reduction section, and reduced material is before reduction, and have passed through sufficient preheating, heat is utilized effectively, and the efficiency of reduction is improved; Reduction room and combustion chamber are independent separately, respective reducing atmosphere and oxidizing atmosphere non-interference, can uniform temperature fields be realized, the product of high degree of metalization can be obtained; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient.
Embodiment 3
As shown in Figure 1, tube reduction furnace of the present invention comprises 4 reduction room (1) and 3 combustion chambers (2), reduction room (1) and combustion chamber (2) is arranged by partition wall interval, form the structure sharing a combustion chamber (2) between two reduction room (1), shown partition wall is high temperature resistant, anti-oxidation, anti-reduction and the anti abrasive partition wall of resistance to material; Reduction room is made up of upper and lower two portions, is respectively preheating section (3) and reduction section (4); The upper and lower two portions in combustion chamber are respectively heating zone and burning zone; Reduction room (1) top of this tube reduction furnace is provided with opening for feed, and reduction section (4) below is provided with cooling section (5) and discharge device (6).
Reduction room (1) and the combustion chamber (2) of this tube reduction furnace are all rectangular parallelepiped, reduction room (1) width is 500mm, and length is 8000mm, wherein, preheating section (3) is highly 4000mm, and reduction section (4) is highly 6000mm; Combustion chamber (2) width is 300mm, and length is 8000mm, and wherein, heating zone height is 4000mm, and burning zone height is 6000mm.
The effect that Coal-based Direct Reduction Technologies of the present invention reaches: reduction room and two, combustion chamber unit can carry out modular combination, by combining a lot of reduction rooms and combustion chamber unit realizes high yield and large-scale production; Reduction room is divided into preheating section, reduction section, and reduced material is before reduction, and have passed through sufficient preheating, heat is utilized effectively, and the efficiency of reduction is improved; Reduction room and combustion chamber are independent separately, respective reducing atmosphere and oxidizing atmosphere non-interference, can uniform temperature fields be realized, the product of high degree of metalization can be obtained; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient.
Embodiment 4
As shown in Figure 1, tube reduction furnace of the present invention comprises 4 reduction room (1) and 3 combustion chambers (2), reduction room (1) and combustion chamber (2) is arranged by partition wall interval, form the structure sharing a combustion chamber (2) between two reduction room (1), shown partition wall is high temperature resistant, anti-oxidation, anti-reduction and the anti abrasive partition wall of resistance to material; Reduction room is made up of upper and lower two portions, is respectively preheating section (3) and reduction section (4); The upper and lower two portions in combustion chamber are respectively heating zone and burning zone; Reduction room (1) top of this tube reduction furnace is provided with opening for feed, and reduction section (4) below is provided with cooling section (5) and discharge device (6); 4 burners are set in the burning zone of combustion chamber (2) bottom.
Reduction room (1) and the combustion chamber (2) of this tube reduction furnace are all rectangular parallelepiped, reduction room (1) width is 600mm, and length is 12000mm, wherein, preheating section (3) is highly 6000mm, and reduction section (4) is highly 8000mm; Combustion chamber (2) width is 400mm, and length is 12000mm, and wherein, heating zone height is 6000mm, and burning zone height is 8000mm.
The effect that Coal-based Direct Reduction Technologies of the present invention reaches: reduction room and two, combustion chamber unit can carry out modular combination, by combining a lot of reduction rooms and combustion chamber unit realizes high yield and large-scale production; Reduction room is divided into preheating section, reduction section, and reduced material is before reduction, and have passed through sufficient preheating, heat is utilized effectively, and the efficiency of reduction is improved; Reduction room and combustion chamber are independent separately, respective reducing atmosphere and oxidizing atmosphere non-interference, can uniform temperature fields be realized, the product of high degree of metalization can be obtained; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient.
Embodiment 5
As shown in Figure 1, tube reduction furnace of the present invention comprises 4 reduction room (1) and 3 combustion chambers (2), reduction room (1) and combustion chamber (2) is arranged by partition wall interval, form the structure sharing a combustion chamber (2) between two reduction room (1), shown partition wall is high temperature resistant, anti-oxidation, anti-reduction and the anti abrasive partition wall of resistance to material; Reduction room is made up of upper and lower two portions, is respectively preheating section (3) and reduction section (4); The upper and lower two portions in combustion chamber are respectively heating zone and burning zone; Reduction room (1) top of this tube reduction furnace is provided with opening for feed, and reduction section (4) below is provided with cooling section (5) and discharge device (6).
Reduction room (1) and the combustion chamber (2) of this tube reduction furnace are all terraced body, the cross section of reduction room (1) horizontal direction is rectangle, width is 300mm, length is 3000mm, the cross section of this reduction room (1) vertical direction is trapezoidal, wherein, preheating section (3) is highly 3000mm, and reduction section (4) is highly 4000mm; The cross section of combustion chamber (2) horizontal direction is rectangle, and width is 100mm, and length is 3000mm, and the cross section of this combustion chamber (2) vertical direction is trapezoidal, and wherein, heating zone height is 3000mm, and burning zone height is 4000mm.
The effect that Coal-based Direct Reduction Technologies of the present invention reaches: reduction room and two, combustion chamber unit can carry out modular combination, by combining a lot of reduction rooms and combustion chamber unit realizes high yield and large-scale production; Reduction room is divided into preheating section, reduction section, and reduced material is before reduction, and have passed through sufficient preheating, heat is utilized effectively, and the efficiency of reduction is improved; Reduction room and combustion chamber are independent separately, respective reducing atmosphere and oxidizing atmosphere non-interference, can uniform temperature fields be realized, the product of high degree of metalization can be obtained; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient.
Embodiment 6
As shown in Figure 1, tube reduction furnace of the present invention comprises 4 reduction room (1) and 3 combustion chambers (2), reduction room (1) and combustion chamber (2) is arranged by partition wall interval, form the structure sharing a combustion chamber (2) between two reduction room (1), shown partition wall is high temperature resistant, anti-oxidation, anti-reduction and the anti abrasive partition wall of resistance to material; Reduction room is made up of upper and lower two portions, is respectively preheating section (3) and reduction section (4); The upper and lower two portions in combustion chamber are respectively heating zone and burning zone; Reduction room (1) top of this tube reduction furnace is provided with opening for feed, and reduction section (4) below is provided with cooling section (5) and discharge device (6); 4 burners are set in the burning zone of combustion chamber (2) bottom.
Reduction room (1) and the combustion chamber (2) of this tube reduction furnace are all terraced body, the cross section of reduction room (1) horizontal direction is rectangle, width is 600mm, length is 12000mm, the cross section of this reduction room (1) vertical direction is trapezoidal, wherein, preheating section (3) is highly 6000mm, and reduction section (4) is highly 8000mm; The cross section of combustion chamber (2) horizontal direction is rectangle, and width is 400mm, and length is 12000mm, and the cross section of this combustion chamber (2) vertical direction is trapezoidal, and wherein, heating zone height is 6000mm, and burning zone height is 8000mm.
The effect that Coal-based Direct Reduction Technologies of the present invention reaches: reduction room and two, combustion chamber unit can carry out modular combination, by combining a lot of reduction rooms and combustion chamber unit realizes high yield and large-scale production; Reduction room is divided into preheating section, reduction section, and reduced material is before reduction, and have passed through sufficient preheating, heat is utilized effectively, and the efficiency of reduction is improved; Reduction room and combustion chamber are independent separately, respective reducing atmosphere and oxidizing atmosphere non-interference, can uniform temperature fields be realized, the product of high degree of metalization can be obtained; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient; Arrange cooling section in the bottom of reduction section, take preheating section top loading, from cooling section bottom discharging, the temperature of discharge can control, and production operation is reliable, convenient.
Tube reduction furnace of the present invention, reduction room (1) and the number of combustion chamber (2) can be determined according to industrial scale demand, and in single reduction room, in preheating section and reduction section and combustion chamber, the number of the length of heating zone and burning zone, width, height and burner all can be determined according to industrial scale flexibly.
Embodiment 7
As shown in Figure 1, the reduction process of tube reduction furnace provided by the present invention is as follows:
1., before first production, first filled by the cooling section (5) reduced in room (1) with reductive agent, reductive agent is hard coal, bituminous coal, brown coal, coke, charcoal etc.;
2. granulate after the batchings such as metallic raw material, binding agent being fully mixed, globule size is about 8mm ~ 30mm, the process of drying operation, is directly transported to feed bin; Described metalliferous feed material is the metal powder materials such as powdered iron ore, iron content powder, nickel minerals powder, vanadium titanium;
3. be fully mixed after the batchings such as reductive agent powder, above-mentioned granular feedstock and additive, mixing material is added by the preheating section (3) of furnace top equipment from reduction room (1) top, after reduction section (4) is filled, except leaving a small amount of space confession reducing gas above preheating section (3) charge level and collecting, its complementary space is filled by by mixing material, after charging, in reduction room (1), each opening for feed of preheating section (3) completes self-closed;
4. combustion chamber (2) are positioned at reduction room (1) both sides, reduction process institute heat requirement is provided by combustion chamber (2) completely, in the burning zone of combustion chamber (2) bottom, burner is set, realize the burning of different fuel and combustion-supporting gas, fire fuel and combustion-supporting gas produce the high-temperature flue gas of 900 ~ 1500 DEG C, uninterrupted burning continuously, high-temperature flue gas heat is by the mixing material in overall homogeneous heating reduction room (1) of resistance to material; Fuel is Sweet natural gas, coal coal gas, blast furnace gas, coal gas of converter, coke-oven gas etc.;
5. mixing material carries out sufficient reduction reaction in reduction room (1); According to different raw metals, the temperature in reduction room (1) realizes adjustable, controlled by combustion chamber (2), and the reduction reaction time is also adjustable, controlled;
6. the flue-gas temperature of combustion chamber (2) burning zone discharge is higher, about 700 ~ 1300 DEG C, the mixing material in heating preheating section (3) is continued by the exhaust gases passes in the heating zone of combustion chamber (2) top, the high-temperature flue gas of finally discharging about 400 ~ 1000 DEG C, heat recuperation is carried out by heat exchanger, preheating enters fuel and/or the combustion-supporting gas of combustion chamber (2), fuel and/or combustion-supporting gas can be preheated to 300 ~ 800 DEG C, flue-gas temperature after heat exchange terminates is reduced to 200 ~ 500 DEG C, also can be used for dried feed etc., arranged outward by chimney after last flue gas ash removal,
7. the mixing material of each reduction room (1) reduction section (4) is in reaction process, the reducing gas produced, as CO, H2 etc., after the headspace enrichment of reduction room (1) preheating section (3), derived by top duct, be back to each combustion chamber (2) after house steward collects as fuel;
8. mixing material is after reduction section (4) fully reduction, mixing material in reduction section (4) enters the cooling section (5) of reduction room (1) bottom, after cooling section (5) is cooled to the temperature of needs, the temperature of mixing material can reach 50 ~ 800 DEG C, take the mode of continuous pulp discharge or discontinuous discharge, be discharged in storage equipment or transportation equipment, go back the degree of metalization of original product up to more than 90%.
The technology of the present invention has the following advantages:
1. lump or bonding between mixing material and between mixing material and furnace wall to prevent, mixing material is slowly downward continuous pulp discharge or discontinuous discharge in reduction process.
2. the mixing material of reduced material and reductive agent composition, preheating section (3), reduction section (4) and the cooling section (5) in reduction room (1) is have passed through in whole reduction process, heat can be made full use of, improve reduction efficiency, shorten the recovery time, obtain temperature required going back original product simultaneously.
3. combustion chamber (2) provide heat must by high temperature resistant, anti-oxidation, anti-reduction and the anti abrasive partition wall of resistance to material to reduction room (1), therefore high to the requirement of resistance to material, are also directly connected to the effect of going back original product.
4. reduce preheating section (3) in room (1), reduction section (4) and combustion chamber (2) horizontal direction cross section be elongated rectangle, vertical direction cross section is rectangle or trapezoidal.
5. reduction room (1) and combustion chamber (2) is elongate rectangular space, not only volume is large, and uniform temperature fields, in addition, reduction room (1) and combustion chamber (2) are modular combination, its quantity can need adjust according to output, and the annual production in single reduction furnace workshop can between 10 ~ 2,000,000 tons, even higher.
Embodiment 8
The method of reducing of tube reduction furnace of the present invention, comprises the following steps:
1. granulate after the powdered iron ore of ferrous grade more than 50%, binding agent being fully mixed, globule size is about 12mm, is transported to storage bin after drying treatment;
2. the batching such as granular feedstock and brown coal reductive agent will obtained above, granular feedstock and reductive agent mass ratio are about 1:0.3, after being fully mixed by loading device from preheating section top loading, reduced material be in loose, be uniformly distributed, bulk density is about 1.7t/m
3, the filling ratio about 90% of material in reduction room, after charging, each opening for feed in reduction room completes self-closed;
3. whole reduction room is elongated shape, and its width is 300 ~ 600mm, and length is 3 ~ 12m, height 7 ~ 14m; Whole combustion chamber is also elongated shape, and its width is 100 ~ 400mm, and length is 3 ~ 12m, height 7 ~ 14m;
4. the preheating gas supplied to combustion chamber by pipeline is 600 DEG C and warm-up combustion-supporting air is 600 DEG C;
5. the high-temperature flue gas of coal gas and combustion air burning generation 1400 DEG C in combustion chamber, granular iron-bearing material and reductive agent carry out reduction reaction reducing indoor; Temperature in reduction room in reduction section controls at 1100 DEG C, and reduction reaction time controling is at 14h;
6. combustion chamber flue-gas temperature out about 900 DEG C, high-temperature flue gas after discharge carries out heat recuperation by heat exchanger, the coal gas and/or combustion air that enter combustion chamber are preheated to 600 DEG C, flue-gas temperature after heat exchange terminates is reduced to 200 ~ 300 DEG C, be further used as raw material drying gas, arrange outward finally by chimney;
7. each reduction room iron-bearing material after completion of the reaction, and direct-reduced iron and remaining toner are discharged by the bottom of cooling section, obtain the granular direct-reduced iron that degree of metalization reaches 90%.
This reduction furnace output is high, and every day, direct-reduced iron output was about 5750 tons, and annual production can reach 2,000,000 tons, far exceedes current already present various Coal-based Direct Reduction Technologies.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (8)
1. a tube reduction furnace, it is characterized in that, described tube reduction furnace comprises the module that at least two groups are made up of reduction room and the combustion chamber of rectangle, described reduction room is made up of upper and lower two portions, be respectively preheating section and reduction section, described tube reduction furnace also comprises the discharge device be arranged at for continuous or discontinuous discharge below described reduction section.
2. according to the tube reduction furnace described in claim 1, it is characterized in that, the cross section of described preheating section, described reduction section horizontal direction is rectangle, width is 300 ~ 600mm, length is 3000 ~ 12000mm, the cross section of described preheating section, described reduction section vertical direction is all rectangle or trapezoidal, and described preheating section height is 3000 ~ 6000mm, and described reduction section height is 4000 ~ 8000mm.
3. according to the tube reduction furnace described in claim 1, it is characterized in that, described combustion chamber is made up of upper and lower two portions, be respectively heating zone and burning zone, be provided with two or more burner in described burning zone, the cross section of described heating zone, burning zone horizontal direction is rectangle, width is 100 ~ 400mm, length is 3000 ~ 12000mm, and the cross section of described heating zone, burning zone vertical direction is all rectangle or trapezoidal, is highly respectively 3000 ~ 6000mm, 4000 ~ 8000mm.
4. one kind adopts the method for reducing of tube reduction furnace according to claim 1, it is characterized in that, metalliferous feed material mixes with reductive agent after pelletizing, mixing material carries out heating and reducing in described preheating section and described reduction section, in whole heating and reduction process, mixing material is slowly downward continuous motion or discontinuous motion, finally realize continuously or discontinuous discharge through discharge device after cooling section cooling below described reduction section, after the coal gas of high temperature that described reduction section produces participates in reduction reaction, be up to preheating section and continue heating and reduction mixing material.
5. method of reducing according to claim 4, is characterized in that, the high-temperature flue gas that described burning zone produces first by the mixing material of partition wall heat reduction section, then is up to heating zone heats described preheating section mixing material by partition wall.
6. method of reducing according to claim 4, is characterized in that, the coal gas of discharging from described preheating section is as the fuel of combustion chamber.
7. method of reducing according to claim 4, is characterized in that, the flue gas of discharging from described heating zone is used for fuel described in preheating needed for burning zone and/or combustion air, and is used for dry containing metal pelletizing.
8. method of reducing according to claim 4, is characterized in that, the cooling section that described reduction section bottom is arranged after the high temperature mixing material after reduction is cooled to 50 ~ 100 DEG C or 500 ~ 900 DEG C continuously or be interrupted and discharge.
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| CN106635067A (en) * | 2016-11-24 | 2017-05-10 | 武汉科思瑞迪科技有限公司 | Shaft furnace process for producing iron coke |
| CN106755687A (en) * | 2016-11-24 | 2017-05-31 | 武汉科思瑞迪科技有限公司 | A kind of based shaft kiln directly reduced technique of coal |
| CN106868245A (en) * | 2017-03-13 | 2017-06-20 | 武汉科思瑞迪科技有限公司 | A kind of molten iron making processes of two-step method |
| CN107904347A (en) * | 2017-11-30 | 2018-04-13 | 中冶南方工程技术有限公司 | A kind of coal-based direct reduction shaft furnace and its restoring method |
| CN110669892A (en) * | 2019-11-22 | 2020-01-10 | 刘建华 | Device for reducing iron oxide |
| CN110938725A (en) * | 2019-11-25 | 2020-03-31 | 中南大学 | Efficient reduction system and method for metal oxide |
| CN112981030A (en) * | 2021-02-23 | 2021-06-18 | 中冶南方工程技术有限公司 | Treatment furnace |
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