CN111910037A - Shaft furnace direct reduction device and discharging method thereof - Google Patents
Shaft furnace direct reduction device and discharging method thereof Download PDFInfo
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- CN111910037A CN111910037A CN202010788629.2A CN202010788629A CN111910037A CN 111910037 A CN111910037 A CN 111910037A CN 202010788629 A CN202010788629 A CN 202010788629A CN 111910037 A CN111910037 A CN 111910037A
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- discharging
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- shaft furnace
- reaction chamber
- furnace
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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
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/12—Shells or casings; Supports therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/21—Arrangements of devices for discharging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/24—Cooling arrangements
Abstract
The invention discloses a shaft furnace direct reduction device and a discharging method thereof, and relates to the technical field of non-blast furnace smelting reduction. The shaft furnace direct reduction device comprises a shaft furnace and a discharging device, wherein the shaft furnace comprises a reaction chamber and a combustion chamber; two side walls at the lower part of the reaction chamber are structures for reinforcing the furnace wall, and a combustion chamber is arranged above the structure for reinforcing the furnace wall; the bottom of the other two side surfaces of the reaction chamber is respectively provided with a discharge port, and the height of the upper edge of the discharge port is not higher than that of the upper edge of the reinforced furnace wall; and a discharging device is arranged outside the discharge port at one end and comprises a supporting piece and a discharging piece, one end of the supporting piece and one end of the discharging piece are respectively connected with a driving device, and the inside or the bottom of the supporting piece is in sliding fit with the discharging piece. The invention adopts the structure that the discharge ports are arranged at the two sides of the shaft furnace, thereby greatly reducing the construction cost and increasing the structural stability and firmness; the discharge device works intermittently and is used for discharging a plurality of different reaction chambers or a single reaction chamber, the discharge device is less, the investment is low, the equipment maintenance is convenient, and the operation rate is not influenced.
Description
Technical Field
The invention relates to the technical field of non-blast furnace smelting reduction, in particular to a shaft furnace direct reduction device and a discharging method thereof.
Background
The current main processes of direct reduction include: a gas-based shaft furnace process, a coal-based rotary kiln process, a rotary hearth furnace process, a tunnel kiln process, a coal-based shaft furnace process and the like. The coal-based shaft furnace process is suitable for the current situation of taking coal as main energy in China and has the most development potential. However, the existing coal-based shaft furnace process has some defects, which are mainly reflected in that: (1) the whole furnace adopts a frame structure and a lower discharging mode, so that the design standard is improved, the material standard is improved, the construction standard is improved, the material consumption is increased, and the building investment is high; (2) a plurality of discharge systems are needed for a single reaction chamber, so that the equipment is more, the equipment investment is large, the number of faults is large, and the production rate is low; (3) the hot discharging equipment works continuously in a high-temperature environment, so that the loss is large, the service life is short, the operation rate is low, and the maintenance is impossible; (4) the discharge system has the advantages of complex equipment, more actions, more faults, low production rate and high investment; (5) the temperature distribution of the reduction chamber is uneven, so that the product quality is influenced; (6) and the heat of the hot flue gas is recovered by adopting a heat exchange mode, so that the heat exchange efficiency is low.
Patent publication No. CN201166513 "external heating type shaft furnace of coal-based direct reduced iron" discloses an external heating type shaft furnace of coal-based direct reduced iron, which adopts the technical scheme that a plurality of independent rectangular vertical reduction reaction chambers are arranged in a furnace body, two sides of each rectangular vertical reduction reaction chamber are respectively provided with a coal gas combustion chamber, the combustion chambers are provided with a plurality of layers of coal gas nozzles along the height direction, and hot flue gas recovers part of heat at the upper part of the furnace in a heat exchange mode. The shaft furnace has the following disadvantages: (1) the temperature near the burner is high, and the temperature far away from the burner is low, so that the temperature of furnace burden is uneven, the product quality is influenced, and the reduction effect is influenced; (2) the outer walls on two sides of the rectangular vertical reduction reaction chamber are not fixed by reinforcing ribs, when furnace burden in the furnace is subjected to high-temperature reaction, the stress on the side walls is increased, the furnace walls are easy to damage, and (3) the heat of part of hot flue gas is recovered by adopting a heat exchange mode, so that the heat exchange efficiency is low.
Patent publication No. CN204529897U external heating type coal-based shaft furnace for producing direct reduced iron describes that airflow channels and partition walls are arranged at two sides of a furnace charge reduction chamber, and the partition walls are integrally built by vertical walls and airflow channels. The air flow channel is a vertical channel in the middle of the furnace body. This patent suffers from the following disadvantages: (1) the structure is quite complex, the construction is difficult, the consumption of refractory materials is large, and the overall investment is high; (2) the temperature distribution of the gas supply channel is uneven, the product quality is influenced, and the reduction effect is influenced; (3) the heat exchange face wall has no effective reinforcement treatment, and when the furnace burden reacts at high temperature, the side wall is stressed greatly, and the heat exchange face wall is easy to damage.
Publication No. CN208104453U discloses a discharge system of a coal-based shaft furnace, which adopts a lower discharge mode and comprises at least one discharge unit, wherein each discharge unit comprises: three cooling tank systems, 3 discharger systems. The discharging machine works at high temperature and is provided with a water cooling device, the rotating speed of each discharging machine can be adjusted, and the central shaft of each discharging machine is provided with the water cooling device. According to the patent description, the disadvantages are: (1) the shaft furnace bottom discharging needs to adopt a frame structure, so that the construction investment is greatly increased; (2) a plurality of discharging units are required to be arranged in a single reduction chamber, so that the investment is increased; (3) each discharging unit has quite complex structure, more systems, more equipment, more mechanical actions, more accidents and low operation rate; (4) the hot discharging equipment works continuously in a high-temperature environment, and has the advantages of large loss, short service life, low operating rate and incapability of maintenance.
Disclosure of Invention
In order to solve the technical problems, the invention provides a shaft furnace direct reduction device and a material discharging method thereof, and the design scheme is simplified, the investment is low, the structure is firm, the equipment is less, and the operation rate is high.
In order to realize the technical purpose, the device adopts the following scheme: a shaft furnace direct reduction device comprises a shaft furnace and a discharging device, wherein the shaft furnace comprises a reaction chamber and a combustion chamber; two side walls at the lower part of the reaction chamber are structures for reinforcing the furnace wall, and a combustion chamber is arranged above the structure for reinforcing the furnace wall; the bottom of the other two side surfaces of the reaction chamber is respectively provided with a discharge port, and the height of the upper edge of the discharge port is not higher than that of the upper edge of the reinforced furnace wall; and a discharging device is arranged outside the discharge port at one end and comprises a supporting piece and a discharging piece, one end of the supporting piece and one end of the discharging piece are respectively connected with a driving device, and the inside or the bottom of the supporting piece is in sliding fit with the discharging piece.
Compared with the prior art, the device has the beneficial effects that: the vertical furnace adopts the structure that the discharge ports are arranged on two sides of the vertical furnace, namely two side walls of the lower part of the reaction chamber, and the vertical furnace is directly built on a foundation, so that the mode that the vertical furnace is supported by a frame and discharged from the bottom in the prior art is changed, the design, land exploration, construction workload and material consumption are greatly reduced, the construction cost is greatly reduced, the structural stability and firmness are increased, and a material conveying system avoids the obstruction of the bottom frame and is easier to arrange; the discharge device works intermittently and is used for discharging materials in a plurality of different reaction chambers or a single reaction chamber, the discharge device is less, the investment is low, the equipment maintenance is convenient, the operation rate is not influenced, the problem of discharging high-temperature materials is solved without continuously working at high temperature, the production time is shortened by the high-temperature discharge, the production efficiency is improved, and the energy consumption is saved for further melting the materials.
The preferred scheme of the device of the invention is as follows:
a furnace door and an air curtain device are arranged outside a discharge hole at the discharge device; the outer side of the other discharge port is provided with a furnace door and an air curtain device, or the other discharge port is directly communicated with a material conveying device in a sealing way.
The shaft furnace also comprises a regenerative chamber communicated with the combustion chamber, and the regenerative chamber is arranged on the side of the combustion chamber. The heat storage chamber recycles the heat, thereby effectively reducing the energy consumption of the shaft furnace and saving the fuel.
A cooling chamber is arranged between the combustion chamber and the reinforced furnace wall.
The vertical part of the reinforced furnace wall adopts an integrated structure, and one end of the vertical part is embedded and fixed in the furnace bottom.
The length of the support piece is not less than the distance between the two discharge ports of the reaction chamber, and the longitudinal section size of the support piece along the length direction is less than the size of the discharge port.
The supporting piece is a hollow sleeve, the discharging piece comprises a material pushing disc and a push rod, the inner cavity of the hollow sleeve is in sliding fit with the material pushing disc, the material pushing disc is movably connected with one end of the push rod, and the tail ends of the push rod and the hollow sleeve are respectively connected with the driving device.
The shape and the size of the material pushing disc are matched with the inner cavity of the hollow sleeve.
The hollow sleeve is of a hollow cylinder structure, the front end of the hollow cylinder is of a tooth-shaped structure, the rear end of the hollow cylinder is fixedly connected with the front end of the hollow square cylinder, and the hollow square cylinder is connected with the driving device.
The inner cavities of two ends of the hollow square cylinder are provided with sliding grooves, the outer wall of the hollow square cylinder is provided with hemp teeth, the hollow square cylinder is connected with the main hydraulic cylinder through the hemp teeth, and the cylinder core of the auxiliary hydraulic cylinder is connected with the cylinder wall of the main hydraulic cylinder; the main hydraulic oil cylinder and the auxiliary hydraulic oil cylinder are respectively hinged with an oil cylinder seat, the oil cylinder swings by taking a hinge point as a shaft, and the oil cylinder seat is fixed on the frame body.
The side surface of the push rod is provided with hemp teeth, the push rod is connected with the main hydraulic cylinder through the hemp teeth, and the cylinder core of the auxiliary hydraulic cylinder is connected with the cylinder wall of the main hydraulic cylinder; the main hydraulic cylinder and the auxiliary hydraulic cylinder are respectively hinged with a cylinder seat, the cylinder seat swings by taking a hinge point as a shaft, and the cylinder seat is fixed on the frame body.
The lower parts of the outer side surfaces of the hollow cylinder and the hollow square cylinder are provided with positioning slideways in sliding fit, and the positioning slideways are fixed on the frame body; the positioning slideway main body is of a groove-shaped structure, and the front end of the positioning slideway is of an arc-shaped structure matched with the hollow cylinder in shape.
The supporting piece is a supporting plate, the discharging piece comprises a material pushing disc and a push rod, the push rod is fixed on the material pushing disc, the material pushing disc is in sliding fit under the supporting plate, and the tail ends of the push rod and the supporting plate are respectively connected with the driving device.
The invention can also be realized by adopting the following modes: a shaft furnace direct reduction device comprises a shaft furnace and a discharging device, wherein the shaft furnace comprises a reaction chamber and a combustion chamber; two side walls at the lower part of the reaction chamber are structures for reinforcing the furnace wall, and a combustion chamber is arranged above the structure for reinforcing the furnace wall; the bottom of the other two side surfaces of the reaction chamber is respectively provided with a discharge port, and the height of the upper edge of the discharge port is not higher than that of the upper edge of the reinforced furnace wall; the discharging device is arranged outside the discharging port at one end and comprises a rod body, the front end of the rod body is fixed with a solid rod head, and the tail end of the rod body is connected with the driving device.
Preferably, the rear end of the rod body is a hollow rod or a solid rod.
In order to realize the technical purpose, the method adopts the following scheme:
a discharging method of a shaft furnace direct reduction device comprises the following steps:
a. the discharging device is aligned with a discharging port of the reaction chamber to be discharged, and a furnace door of the reaction chamber to be discharged is opened;
b. the discharging device enters from a discharging port at one end until a discharging port at the other end stops, the material at the bottom of the reaction chamber is pushed out, then the discharging device is withdrawn, the material at the upper part of the discharging port of the reaction chamber fills the bottom space again by the self gravity, the furnace door is closed, and one-time discharging is finished;
c. the discharged materials enter a material conveying device, and the discharging process of each reaction chamber is repeated.
Compared with the prior art, the method has the beneficial effects that: according to the discharging method provided by the invention, one discharging device can be used for discharging materials in a plurality of different reaction chambers or a single reaction chamber, the discharging device is less, the investment is low, the intermittent operation of the discharging device is convenient, the equipment maintenance is convenient, the operation rate is not influenced, the problem of discharging high-temperature materials is solved particularly without continuously operating at high temperature, the production time is shortened by the high-temperature discharging, the production efficiency is improved, and the energy consumption is saved for further melting and separating the materials.
The preferred scheme of the method of the invention is as follows:
and a, before opening a furnace door at a discharge hole, opening an air curtain device at the discharge hole, wherein inert gas is filled in the air curtain device.
And b, when the supporting piece and the discharging piece are used for discharging materials, the supporting piece enters from a discharging hole at one end, penetrates through the material layer until the discharging hole at the other end stops, the upper material of the supporting piece in the reaction chamber is supported, then the discharging piece is used for discharging the furnace burden in the supporting piece or at the lower part, then the discharging piece and the supporting piece are withdrawn in sequence, the upper material at the discharging hole of the reaction chamber is filled in the bottom space again by means of self gravity, the furnace door is closed, and one-time discharging is completed.
And b, when the hollow sleeve is used for discharging materials, firstly pushing the hollow sleeve from a discharge port at the end of the discharging device, stopping when the hollow sleeve penetrates the materials to reach a discharge port at the other end, pushing the materials in the hollow sleeve out by using a material pushing plate, and then withdrawing the material pushing plate and the hollow sleeve in sequence.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a shaft furnace body of a shaft furnace provided in accordance with an embodiment of the present invention;
FIG. 2 is a side view of plane A-A of FIG. 1;
FIG. 3 is a side view of plane B-B of FIG. 1;
FIG. 4 is a horizontal cross-sectional view of a hollow cylinder discharge apparatus provided in accordance with an embodiment of the present invention;
FIG. 5 is a front view of a hollow cylinder discharge apparatus provided in accordance with an embodiment of the present invention;
FIG. 6 is a side view of plane C-C of FIG. 5;
FIG. 7 is a side view of the D-D surface of FIG. 5;
FIG. 8 is an enlarged view of a portion of FIG. 4 at I;
FIG. 9 is an enlarged view of a portion of FIG. 4 at II;
FIG. 10 is an enlarged view of a portion of FIG. 4 at III;
FIG. 11 is an enlarged view of a portion of FIG. 4 at IV;
FIG. 12 is a front view of a supporting plate discharging device provided in the embodiment of the present invention;
FIG. 13 is a partial schematic view of a shaft furnace having a reinforced furnace wall boss provided in accordance with an embodiment of the present invention;
FIG. 14 is a side view of plane E-E of FIG. 12;
FIG. 15 is a side view of the F-F surface of FIG. 12;
FIG. 16 is a side view of the plane G-G in FIG. 12;
FIG. 17 is a side view taken along the plane H-H in FIG. 12;
FIG. 18 is a horizontal cross-sectional view of a rod discharge device according to an embodiment of the present invention;
FIG. 19 is a front view of a rod discharge device according to an embodiment of the present invention;
labeled as: 1-reaction chamber, 2-combustion chamber, 201-odd flame path, 202-even flame path, 203-flow channel, 3-furnace top, 4-reinforced furnace wall, 401-vertical part, 5-heat conducting wall, 6-furnace door, 7-air curtain device, 8-charging port, 9-discharging port, 10-furnace bottom, 11-heat accumulating chamber, 12-connecting channel, 13-natural gas pipeline, 14-cooling chamber, 15-hollow cylinder, 16-convex tooth, 17-hollow square cylinder, 18-sliding chute, 19-hemp tooth, 20-first positioning slideway, 21-first frame body, 22-first push rod, 23-first push plate, 24-first main hydraulic cylinder, 25-first auxiliary hydraulic cylinder, 26-first cylinder seat, 27-a first cylinder platform, 28-a support plate, 29-a boss, 30-a second material pushing plate, 31-a second pushing rod, 32-an inclined plane, 33-a pushing plate, 34-a double-sided rack, 35-a hydraulic motor, 36-a second positioning slideway, 37-a first supporting device, 38-a second frame body, 39-a second supporting device, 40-a second pushing rod hydraulic cylinder, 41-a second cylinder seat, 42-a rolling bracket, 43-a fixing bracket, 44-a third positioning slideway, 45-a gear, 46-a rod head, 47-a first hollow square rod, 48-a second hollow square rod, 49-a third frame body, 50-a fourth positioning slideway, 51-a second main hydraulic cylinder, 52-a second auxiliary hydraulic cylinder and 53-a second cylinder platform.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.
Referring to fig. 1, the present invention provides a direct reduction apparatus for a shaft furnace, which comprises a shaft furnace, a discharging device, etc., wherein the shaft furnace comprises a reaction chamber 1 and a combustion chamber 2, etc. The two sides of the reaction chamber 1 are sequentially provided with a furnace top 3, a combustion chamber 2 and a reinforced furnace wall 4 from top to bottom, and a heat conducting wall 5 is arranged between the combustion chamber 2 and the reaction chamber 1; the bottom of the other two side furnace walls of the reaction chamber 1 is respectively provided with a discharge port 9, the outer sides of the two discharge ports 9 are respectively provided with a furnace door 6 for shielding the discharge port 9, or the discharge port 9 at one end is provided with the furnace door 6, and the discharge port 9 at the other end is hermetically communicated with a charging bucket or other material conveying equipment. The upper edge of the discharge port 9 is not higher than the upper edge of the reinforced furnace wall 4, and the bottom edge of the discharge port 9 is attached to the bottom of the reaction chamber 1. The upper end of the reaction chamber 1 is provided with a charging hole 8. The width of each reaction chamber 1 is usually 0.3 to 0.7 m, preferably 0.4 to 0.5 m. The top of the reaction chamber 1 is provided with a gas discharge hole. The vertical part 401 of the reinforced furnace wall is of an integral structure and is formed by a furnace brick, one end of the vertical part 401 is embedded and fixed in the furnace bottom 10, and the horizontal part of the reinforced furnace wall 4 is formed by one or more furnace bricks.
Referring to fig. 2, the shaft furnace is further provided with a regenerator 11, the regenerator 11 being located laterally to the combustion chamber 2. The regenerative chamber 11 is connected with the combustion chamber 2 through a connecting channel 12, and the connecting channel 12 is formed by building refractory bricks. At least one group of flame path groups are arranged in the combustion chamber 2, each flame path group comprises a singular flame path 201 and an even flame path 202, a channel partition wall is arranged between the singular flame path 201 and the even flame path 202, and a flow channel 203 for communicating the singular flame path 201 and the even flame path 202 is arranged on the channel partition wall. One regenerator 11 in the middle of the furnace body is respectively connected with the odd flame path 201 of one combustion chamber 2 and the even flame path 202 of the other combustion chamber 2, and the outermost regenerators 11 at the two ends of the furnace body are respectively connected with the odd flame path 201 or the even flame path 202 of one combustion chamber 2. Wherein the number of the connecting channels 12 is the same as the sum of the single and double flame paths in the combustion chamber 2. The combustion chamber 2 is also provided with a natural gas pipeline 13, and natural gas is used when the gas quantity is insufficient.
When the combustion chamber 2 is heated by adopting the heat accumulating type combustion technology, the heat accumulating chamber 11 preheats air and coal gas, the odd flame path 201 or the even flame path 202 in the combustion chamber 2 is respectively communicated with the air connecting pipeline and the coal gas connecting pipeline simultaneously, when the odd flame path 201 is downdraft, the even flame path 202 is downdraft, otherwise, when the odd flame path 201 is downdraft, the even flame path 202 is updraft. The regenerators 11 are operated alternately to supply and recover the flue gases, and the combustion process is repeated until the heating process is completed. The regenerator 11 is used for supplying gas and recovering flue gas, so that hot gas in the combustion chamber 2 flows, the temperature of the reaction chamber 1 is stable, and furnace burden is heated uniformly.
Preferably, a cooling chamber 14 is arranged between the combustion chamber 2 and the reinforced furnace wall 4, a heat conducting wall 5 is arranged between the cooling chamber 14 and the reaction chamber 1, and the cooling chamber 14 adopts a water cooling or air cooling system to cool materials descending to the section of the cooling chamber 14 of the reaction chamber 1.
Referring to fig. 3, when the furnace doors 6 are respectively installed at the outer sides of the two discharge ports 9, the air curtain devices 7 are installed at the outer sides of the two discharge ports 9, the discharge device is installed at the outer side of the discharge port 9 at one side, and the inert gas is filled in the air curtain devices 7. When the outer side of one discharge port 9 is provided with the furnace door 6, and the other discharge port 9 is directly communicated with the material conveying device in a sealing way, the outer side of the discharge port 9 provided with the furnace door 6 is provided with the air curtain device 7 and the material discharging device. The material conveying device is a closed hot material conveying device provided with an inert gas inlet, a waste gas outlet, a feeding hole and a discharging hole, and the inert gas is generally nitrogen. Preferably, the material conveying device adopts a hot direct reduced iron conveying device.
The number of reaction chambers 1 in a shaft furnace is n, the number of combustion chambers 2 and cooling chambers 14 is (n +1), the number of regenerator 11 is (n +2) when regenerator 11 preheats air only, and the number of regenerator 11 is (2n +4) when regenerator 11 preheats air and coal gas. The discharge device is one or more, and the discharge device is movably arranged on the ground track.
The discharging device comprises a supporting piece, a discharging piece, a driving device and the like, wherein one end of the supporting piece and one end of the discharging piece are respectively connected with the driving device, the discharging piece is arranged inside or at the bottom of the supporting piece, and the discharging piece is in sliding fit with the supporting piece. The discharging device is arranged on the frame body, and when the discharging device is a movable discharging device, the bottom of the frame body is provided with the pulley and the sliding rail movably matched with the pulley, so that the discharging device can move to the discharge outlets of different reaction chambers.
Scheme one of the discharge device:
the supporting piece adopts a hollow sleeve structure, the discharging piece comprises a material pushing disc, a pushing rod and the like, the front end of the hollow sleeve is provided with convex teeth 16, and the tail end of the hollow sleeve is connected with a driving device; the inner cavity of the hollow sleeve is in sliding fit with the material pushing disc, the material pushing disc is movably connected with one end of the push rod, and the other end of the push rod is connected with the driving device.
The length of the hollow sleeve is not less than the distance between the two discharge ports 9 of the reaction chamber 1, and the longitudinal section size of the hollow sleeve along the length direction is less than the size of the discharge ports 9. The hollow sleeve can adopt a cylindrical structure such as a cylinder, a square cylinder, an inverted U-shaped cylinder, a triangular cylinder and a rhombic cylinder which can enter from the discharge port 9 at one end and penetrate through the material layer to the discharge port 9 at the other end. The shape and the size of the material pushing disc are matched with the inner cavity of the hollow sleeve. The front end of the hollow sleeve adopts a tooth-shaped structure, so that the hollow sleeve can conveniently enter a material layer of the reaction chamber 1, and the resistance of furnace burden is reduced.
Preferred embodiment one of the discharge device:
referring to fig. 4 to 11, the hollow sleeve is a hollow cylinder 15, the front end of the hollow cylinder 15 is provided with convex teeth 16, the rear end of the hollow cylinder 15 is fixedly connected with the front end of the hollow square cylinder 17 through a flange, the inner cavities at two ends of the hollow square cylinder 17 are provided with sliding grooves 18, the outer wall of the hollow square cylinder 17 is provided with hemp teeth 19, the hemp teeth 19 are used in cooperation with a driving device, and the driving device adopts a hydraulic cylinder. The lower parts of the outer side surfaces of the hollow cylinder 15 and the hollow square cylinder 17 are in sliding connection with a first positioning slide way 20, and the first positioning slide way 20 is fixed on a first frame body 21; the main body of the first positioning slideway 20 is of a groove structure, and the front end of the first positioning slideway 20 is of an arc structure matched with the hollow cylinder 15 in shape. The first material pushing disc 23 fixed with the first push rod 22 is positioned in the inner cavity of the hollow cylinder 15 or the hollow square cylinder 17, the side surface of the first push rod 22 is provided with hemp teeth 19, and the first push rod 22 is horizontally positioned in the sliding grooves 18 of the inner cavities at two ends of the hollow square cylinder 17 and can slide in the sliding grooves 18. The hollow square cylinder 17 and the first push rod 22 are respectively connected with a first main hydraulic cylinder 24 through hemp teeth 19, a cylinder core of a first auxiliary hydraulic cylinder 25 is connected with the cylinder wall of the first main hydraulic cylinder 24, and the first main hydraulic cylinder 24 and the first auxiliary hydraulic cylinder 25 are respectively arranged on two sides of the hollow square cylinder 17 in a symmetrical structure. The first main hydraulic cylinder 24 and the first auxiliary hydraulic cylinder 25 are hinged to a first cylinder base 26, the first main hydraulic cylinder 24 and the first auxiliary hydraulic cylinder 25 swing with a hinge point as an axis, the first cylinder base 26 is fixed on a first cylinder platform 27, the first cylinder platform 27 is fixed on a first frame body 21, a pulley and a sliding rail in movable fit with the pulley are mounted at the bottom of the first frame body 21, and the hollow cylinder 15, the first push rod 22 and the first material pushing disc 23 are made of high-temperature-resistant steel materials.
Scheme two of the discharge device:
referring to fig. 12 to 17, when the supporting member is in the form of a supporting plate 28, the reinforcing wall 4 of the shaft furnace is provided with a horizontal boss 29 along the discharging passage, and the boss 29 is lower than the upper edge of the discharging port 9. The discharging part is composed of a second material pushing disc 30, a second pushing rod 31 and the like. The front end of the supporting plate 28 is provided with an inclined plane 32, the rear end of the supporting plate 28 is fixedly connected with the front end of the push plate 33, a double-sided rack 34 is installed on the upper plane of the push plate 33, and the double-sided rack 34 is used for being matched with a hydraulic motor 35. The lower parts of the supporting plate 28 and the push plate 33 are connected with a second positioning slideway 36 in a sliding way, and the second positioning slideway 36 is fixed on a second frame body 38 through a first supporting device 37; the push plate 33 is connected with the gears 45 on the two hydraulic motors 35 through the double-sided rack 34 on the upper plane, and the two hydraulic motors 35 are symmetrically arranged on the second frame body 38 through the second supporting device 39; the second material pushing disc 30 is fixedly connected with one end of a second push rod 31, the other end of the second push rod 31 is fixedly connected with a cylinder core of a second push rod hydraulic oil cylinder 40, at least one second push rod hydraulic oil cylinder 40 is provided, a plurality of second push rod hydraulic oil cylinders 40 are fixedly connected, the second push rod hydraulic oil cylinder 40 at the tail end is fixedly connected with a second oil cylinder seat 41, the second material pushing disc 30 is solid and square, a rolling bracket 42 is arranged at the rear end of the second push rod 31 and the lower part of the front end of the second push rod hydraulic oil cylinder 40, a fixing bracket 43 and a rolling bracket 42 are arranged at the lower part of the second push rod hydraulic oil cylinder 40, the fixed support 43 and the second material pushing tray 30 are located in a third positioning slide 44, the rolling support 42 and the second material pushing tray 30 roll or slide in the third positioning slide 44, the third positioning slide 44 is fixed on the second frame body 38, and the bottom of the second frame body 38 is provided with a pulley and a slide rail movably matched with the pulley. The supporting plate 28, the second push rod 31 and the second material pushing disc 30 are made of high temperature resistant steel materials.
The third scheme of the discharge device is as follows:
the discharging device comprises a rod body, a driving device and the like, wherein a solid square rod head is fixed at the front end of the rod body, the tail end of the rod body is connected with a hydraulic oil cylinder of the driving device, and the hydraulic oil cylinder is fixed on the frame body. Preferably, the rear end of the rod body adopts a hollow square rod or solid square rod structure made of high-temperature-resistant steel materials.
Preferred embodiment three of the discharge device:
referring to fig. 18 and 19, the rod body of the discharging device is composed of a solid square rod head 46 at the front end and a first hollow square rod 47 at the rear end, the rear end of the first hollow square rod 47 is fixedly connected with the front end of a second hollow square rod 48 through a flange, the outer wall of the second hollow square rod 48 is provided with hemp teeth 19, and the hemp teeth 19 are used for being matched with a hydraulic cylinder. The lower part of the outer side surface of the rod body of the hollow square rod is connected with a fourth positioning slideway 50 in a sliding way, and the fourth positioning slideway 50 is fixed on a third frame body 49; the fourth positioning chute 50 is of a trough-type structure. The second hollow square rod 48 is connected with a second main hydraulic cylinder 51 through the hemp teeth 19, a cylinder core of a second auxiliary hydraulic cylinder 52 is connected with the cylinder wall of the second main hydraulic cylinder 51, and the second main hydraulic cylinder 51 and the second auxiliary hydraulic cylinder 52 are respectively arranged on two sides of the second hollow square rod 48 by adopting a symmetrical structure. The second main hydraulic cylinder 51 and the second auxiliary hydraulic cylinder 52 are hinged to a third cylinder base respectively, the second main hydraulic cylinder 51 and the second auxiliary hydraulic cylinder 52 swing around a hinge point serving as a shaft, the third cylinder base is fixed on a second cylinder platform 53, and the second cylinder platform 53 is fixed on a third frame body 49.
The discharging method of the shaft furnace direct reduction device comprises the following steps:
a. the discharging device is aligned with a discharging port 9 of the reaction chamber to be discharged, and a furnace door 6 of the reaction chamber to be discharged is opened;
b. the discharging device enters from a discharging port at one end until a discharging port at the other end stops, the material at the bottom of the reaction chamber 1 is pushed out, then the discharging device is withdrawn, the material at the upper part of a discharging port 9 of the reaction chamber fills the bottom space again by the self gravity, the furnace door 6 is closed, and one-time discharging is completed;
c. the discharged materials enter a material conveying device, and the discharging process of each reaction chamber 1 is repeated.
A first material discharging mode:
the discharging device of the hollow cylinder 15 is adopted for discharging, and the operation is divided into three stages, namely a preparation stage, a material pushing stage and a material pushing equipment withdrawing stage. During the preparation stage, the discharge device is moved to the front of a discharge port 9 to be discharged, the front end of a first material pushing plate 23 is aligned with the front end of a hollow cylinder 15, a first auxiliary hydraulic oil cylinder 25 is extended out, a first main hydraulic oil cylinder 24 is pushed to the rear end of a first hemp tooth 19 at the front end of the hollow square cylinder 17, an air curtain device 7 at the upper edge of the discharge port 9 is opened, a furnace door 6 is opened again, the discharge port 9 is filled with nitrogen, when the other side of the furnace door 6 is also provided with the furnace door 6, the nitrogen air curtain device 7 at the upper edge of the discharge port 9 is opened simultaneously, the furnace door 6 is opened again, the hot direct reduced iron conveying device is communicated with the furnace door 6 in a sealing mode, and the. In the material pushing stage, the first main hydraulic oil cylinder 24 extends to push the hollow square cylinder 17 to move forward, the first auxiliary hydraulic oil cylinder 25 is in a floating state at the moment, the hollow cylinder 15 enters the material layer of the reaction chamber 1, and the material enters the hollow cylinder 15 and blocks the first material pushing disc 23 from moving forward. After the cylinder core of the first main hydraulic cylinder 24 extends to the position according to the set stroke, the hollow square cylinder 17 and the hollow cylinder 15 stop advancing, after the first advancing is completed, the cylinder core of the first main hydraulic cylinder 24 starts to withdraw, and the cylinder core of the first auxiliary hydraulic cylinder 25 is subsequently withdrawn, so that the top of the cylinder core of the first main hydraulic cylinder 24 is prevented from touching a second hemp tooth at the front end of the hollow square cylinder 17 until the cylinder cores of the first main hydraulic cylinder 24 and the first auxiliary hydraulic cylinder 25 are withdrawn to the position, and then the first auxiliary hydraulic cylinder 25 is extended out to push the first main hydraulic cylinder 24 to the rear end of a second hemp tooth 19 at the front end of the hollow square cylinder 17 to prepare for the next advancing action until the front end of the hollow cylinder 15 reaches the other end 9, and the advancing action of the hollow cylinder 15 is completed. At the moment, the front end of a first material pushing plate 23 in the hollow cylinder 15 is filled with materials, the hollow square cylinder 17 moves forwards to expose a hemp tooth 19 at the rear section of a first push rod 22, and the first main hydraulic oil cylinder 24 is repeatedly used for pushing the hollow square cylinder 17 to move forwards to push the first push rod 22 to move forwards until the materials in the hollow cylinder 15 are pushed out to the hot direct reduced iron conveying device communicated with the discharge hole 9 at the other end in a sealing mode. When the pushing equipment is withdrawn, the first main hydraulic cylinder 24 is extended to the front end of the first hemp tooth 19 at the rear end of the hollow square cylinder 17, the first auxiliary hydraulic cylinder 25 is extended, the first main hydraulic cylinder 24 is pushed to enter the groove of the hemp tooth 19 to hook the hemp tooth 19, the first main hydraulic cylinder 24 is withdrawn to pull the hollow square cylinder 17 to retreat, at the moment, the first auxiliary hydraulic cylinder 25 is in a floating state to drive the hollow square cylinder 15 and the first material pushing plate 23 to retreat until the cylinder core of the first main hydraulic cylinder 24 is completely withdrawn, and a withdrawing action is completed. In the withdrawing process, the material in the reaction chamber 1 fills the withdrawn space again by gravity, the next withdrawing action is continued until the front end of the hollow cylinder 15 is withdrawn from the discharge hole 9, the action of withdrawing the material pushing equipment is finished, the furnace door 6 is closed, and the air curtain device 7 is closed.
A second discharging mode:
the discharging device with the structure of the supporting plate 28 is used for discharging materials, and the operation is divided into four stages, namely a preparation stage, a board inserting stage, a material pushing stage and a material withdrawing stage. In the preparation stage, the discharge device is moved to the front of a discharge port 9 of a reaction chamber 1 to be discharged, an air curtain device 7 at the upper edge of the discharge port 9 is opened, a furnace door 6 is opened, when the furnace door 6 is arranged at the other side, the nitrogen air curtain device 7 at the upper edge of the discharge port 9 is opened at the same time, the furnace door 6 is opened, the hot direct reduced iron conveying device is communicated with the furnace door 6 in a sealing mode, and the hot direct reduced iron conveying device is filled with nitrogen for protection. In the plate inserting stage, the hydraulic motor 35 is rotated forward, the gear 45 on the hydraulic motor 35 is meshed with the double-sided rack 34 to drive the push plate 33 to advance in the second positioning slide way 36, the push plate 33 pushes the support plate 28 to enter the horizontal boss 29 of the reinforced furnace wall 4 of the reaction chamber 1, the support plate 28 is gradually inserted into the deep part of the material layer along the horizontal boss 29 until the material outlet 9 at the other end stops, and the material above the support plate 28 is supported. And in the material pushing stage, a plurality of second push rod hydraulic oil cylinders 40 are sequentially extended to push the second push rods 31 and the second material pushing discs 30 to advance, at the moment, the rolling support 42 runs in the third positioning slide way 44 to push the materials below the supporting plate 28 out to the hot direct reduced iron conveying device hermetically communicated with the material outlet 9 at the other end, and the second push rod hydraulic oil cylinders 40 stop advancing. And when the pushing equipment is withdrawn, the second push rod hydraulic oil cylinder 40 starts to withdraw until the second pushing disc 30 is withdrawn from the discharge port 9, the hydraulic motor 35 is made to rotate reversely, the gear 45 on the hydraulic motor 35 is meshed with the double-sided rack 34 to drive the push plate 33 to withdraw, the push plate 33 pulls the support plate 28 to be gradually withdrawn from the horizontal boss 29 of the reinforced furnace wall 4 of the reaction chamber 1 until the discharge port 9 is withdrawn, and in the withdrawing process, the material in the reaction chamber 1 is filled up again by gravity to the withdrawn space, the action of withdrawing the pushing equipment is completed, the furnace door 6 is closed, and the air curtain device 7 is closed.
A third discharging mode:
when the discharging device is of a rod body structure, the operation is divided into three stages, namely a preparation stage, a material pushing stage and a material withdrawing equipment stage. In the preparation stage, the discharge device is moved to the front of a discharge port 9 of a reaction chamber 1 to be discharged, a second auxiliary hydraulic oil cylinder 52 is extended, a second main hydraulic oil cylinder 51 is pushed to the rear end of a first hemp tooth 19 at the front end of a second hollow square rod 48, an air curtain device 7 at the upper edge of the discharge port 9 is opened, a furnace door 6 is opened again, the discharge port 9 is filled with nitrogen, when the furnace door 6 is arranged at the other side, the nitrogen air curtain device 7 at the upper edge of the discharge port 9 is opened simultaneously, the furnace door 6 is opened again, a hot direct reduced iron conveying device is communicated with the furnace door 6 in a sealing mode, and the hot direct reduced iron conveying device is filled with nitrogen for protection. In the material pushing stage, the second main hydraulic cylinder 51 is extended to push the second hollow square rod 48 to advance in the fourth positioning slide way 50, at the moment, the second auxiliary hydraulic cylinder 52 is in a floating state, the first hollow square rod 47 enters the material layer of the reaction chamber 1, the material is pushed out to a hot direct reduced iron conveying device hermetically communicated with the material outlet 9 at the other end, after the cylinder core of the second main hydraulic cylinder 51 extends to the position according to the set stroke, the hollow square rod stops advancing, after the first pushing is completed, the cylinder core of the second main hydraulic cylinder 51 starts to be withdrawn, the cylinder core of the second auxiliary hydraulic cylinder 52 is subsequently withdrawn, so that the top of the cylinder core of the second main hydraulic cylinder 51 is prevented from touching the second hemp teeth 19 at the front end of the second hollow square rod 48, until the cylinder core of the second main hydraulic cylinder 51 and the cylinder core of the second auxiliary hydraulic cylinder 52 are withdrawn to the position, then the second auxiliary hydraulic cylinder 52 is extended out to push the second main hydraulic cylinder 51 to the rear end of the second hemp teeth 19 at the front end of the second hollow square, preparing for the next pushing action until the front end of the first hollow square rod I47 reaches the discharge hole 9 at the other end, and finishing the pushing action. When the material pushing equipment is withdrawn, the second main hydraulic cylinder 51 is extended to the front end of the first hemp tooth 19 at the rear end of the second hollow square rod 48, the second auxiliary hydraulic cylinder 52 is extended, the second main hydraulic cylinder 51 is pushed to enter the groove of the hemp tooth 19 to hook the hemp tooth 19, the second main hydraulic cylinder 51 is withdrawn to pull the second hollow square rod 48 to retreat, at this time, the second auxiliary hydraulic cylinder 52 is in a floating state to drive the first hollow square rod 47 to retreat until the cylinder core of the second main hydraulic cylinder 51 is completely withdrawn, a pulling-out action is completed, in the withdrawing process, the material in the reaction chamber 1 is refilled into the withdrawn space by virtue of gravity, the next pulling-out action is continued until the front end of the first hollow square rod 47 is withdrawn out of the discharge port 9, the action of the material pushing equipment is completed, the furnace door 6 is closed, and the air curtain device 7 is closed.
The vertical furnace adopts the structure that the discharge ports are arranged on two sides of the vertical furnace, namely two side walls of the lower part of the reaction chamber, and the vertical furnace is directly built on a foundation, so that the mode that the vertical furnace uses a frame for supporting and bottom discharging in the prior art is changed, the design, land exploration, construction workload and material consumption are greatly reduced, the construction cost is greatly reduced, and the structural stability and firmness are improved; in the prior art of the shaft furnace, a plurality of discharge valve systems are required to be installed at the bottom of each reaction chamber, and the longer the reaction chamber is, the more the discharge valve systems are, the more the discharge system has faults, the low production operation rate, the large maintenance amount and the large investment of the discharge system are brought. The discharge device is less, the investment is less and the maintenance amount is small; the intermittent operation facilitates the equipment maintenance, does not influence the operation rate, particularly solves the problem of discharging high-temperature materials without continuously operating at high temperature, shortens the production time, improves the production efficiency and saves the energy consumption for further melting the materials. The invention adopts a heat accumulating type combustion technology, effectively reduces the energy consumption of the shaft furnace by recovering waste heat and saves fuel.
Finally, it is noted that: the above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
Claims (19)
1. A shaft furnace direct reduction device comprises a shaft furnace and a discharging device, wherein the shaft furnace comprises a reaction chamber and a combustion chamber; the device is characterized in that two side walls at the lower part of the reaction chamber are structures for reinforcing the furnace wall, and a combustion chamber is arranged above the structure for reinforcing the furnace wall; the bottom of the other two side surfaces of the reaction chamber is respectively provided with a discharge port, and the height of the upper edge of the discharge port is not higher than that of the upper edge of the reinforced furnace wall; and a discharging device is arranged outside the discharge port at one end and comprises a supporting piece and a discharging piece, one end of the supporting piece and one end of the discharging piece are respectively connected with a driving device, and the inside or the bottom of the supporting piece is in sliding fit with the discharging piece.
2. The direct reduction apparatus for a shaft furnace according to claim 1, wherein a furnace door and an air curtain apparatus are installed outside the discharge port at the discharging means; the outer side of the other discharge port is provided with a furnace door and an air curtain device, or the other discharge port is directly communicated with a material conveying device in a sealing way.
3. The direct reduction apparatus of the shaft furnace according to claim 1 or 2, wherein the shaft furnace further comprises a regenerator in communication with the combustion chamber, the regenerator being disposed laterally of the combustion chamber.
4. The direct reduction apparatus according to claim 1 or 2, characterized in that a cooling chamber is provided between the combustion chamber and the reinforced furnace wall.
5. The direct reduction apparatus for a shaft furnace according to claim 1, wherein the vertical portion reinforcing the furnace wall is of an integral structure, and one end of the vertical portion is embedded and fixed in the bottom of the furnace.
6. The direct reduction apparatus according to claim 1, wherein the support member has a length not less than the distance between the two outlets of the reaction chamber, and the support member has a longitudinal cross-sectional dimension along the length direction smaller than the size of the outlets.
7. The direct reduction apparatus of the shaft furnace according to claim 1 or 6, wherein the supporting member is a hollow sleeve, the discharging member comprises a pushing tray and a pushing rod, an inner cavity of the hollow sleeve is in sliding fit with the pushing tray, the pushing tray is movably connected with one end of the pushing rod, and the pushing rod and the tail end of the hollow sleeve are respectively connected with the driving device.
8. The shaft furnace direct reduction apparatus according to claim 7, wherein the pusher disc is shaped and sized to match the hollow sleeve interior cavity.
9. The direct reduction apparatus of the shaft furnace according to claim 7, wherein the hollow sleeve is of a hollow cylindrical structure, the front end of the hollow cylinder is of a toothed structure, the rear end of the hollow cylinder is fixedly connected with the front end of the hollow square cylinder, and the hollow square cylinder is connected with the driving device.
10. The direct reduction apparatus of the shaft furnace according to claim 9, wherein the inner cavities of both ends of the hollow square cylinder are provided with sliding grooves, the outer wall of the hollow square cylinder is provided with hemp teeth, the hollow square cylinder is connected with the main hydraulic cylinder through the hemp teeth, and the wall of the main hydraulic cylinder is connected with the core of the auxiliary hydraulic cylinder; the main hydraulic oil cylinder and the auxiliary hydraulic oil cylinder are respectively hinged with an oil cylinder seat, the oil cylinder swings by taking a hinge point as a shaft, and the oil cylinder seat is fixed on the frame body.
11. The direct reduction apparatus of the shaft furnace according to claim 10, wherein the push rod is provided with a spur gear on the side surface, the push rod is connected with the main hydraulic cylinder through the spur gear, and the core of the auxiliary hydraulic cylinder is connected with the wall of the main hydraulic cylinder; the main hydraulic cylinder and the auxiliary hydraulic cylinder are respectively hinged with a cylinder seat, the cylinder seat swings by taking a hinge point as a shaft, and the cylinder seat is fixed on the frame body.
12. The direct reduction apparatus of the shaft furnace according to claim 9, wherein the hollow cylinder and the lower portion of the outer side surface of the hollow square cylinder are provided with positioning slideways which are in sliding fit, and the positioning slideways are fixed on the frame body; the positioning slideway main body is of a groove-shaped structure, and the front end of the positioning slideway is of an arc-shaped structure matched with the hollow cylinder in shape.
13. The direct reduction apparatus of the shaft furnace according to claim 1 or 6, wherein the supporting member is a supporting plate, the discharging member comprises a pushing tray and a pushing rod, the pushing tray is fixed with the pushing rod, the pushing tray is in sliding fit with the supporting plate, and the pushing rod and the supporting plate are respectively connected with the driving device at the tail end.
14. A shaft furnace direct reduction device comprises a shaft furnace and a discharging device, wherein the shaft furnace comprises a reaction chamber and a combustion chamber; the device is characterized in that two side walls at the lower part of the reaction chamber are structures for reinforcing the furnace wall, and a combustion chamber is arranged above the structure for reinforcing the furnace wall; the bottom of the other two side surfaces of the reaction chamber is respectively provided with a discharge port, and the height of the upper edge of the discharge port is not higher than that of the upper edge of the reinforced furnace wall; the discharging device is arranged outside the discharging port at one end and comprises a rod body, the front end of the rod body is fixed with a solid rod head, and the tail end of the rod body is connected with the driving device.
15. The direct reduction apparatus of the shaft furnace according to claim 14, wherein the rear end of the rod body is a hollow rod or a solid rod.
16. A method for discharging a direct reduction unit of a shaft furnace according to any one of claims 1 to 15, characterized by comprising the steps of:
a. the discharging device is aligned with a discharging port of the reaction chamber to be discharged, and a furnace door of the reaction chamber to be discharged is opened;
b. the discharging device enters from a discharging port at one end until a discharging port at the other end stops, the material at the bottom of the reaction chamber is pushed out, then the discharging device is withdrawn, the material at the upper part of the discharging port of the reaction chamber fills the bottom space again by the self gravity, the furnace door is closed, and one-time discharging is finished;
c. the discharged materials enter a material conveying device, and the discharging process of each reaction chamber is repeated.
17. The discharge method for a direct reduction unit of a shaft furnace according to claim 16, wherein the gas curtain device at the discharge port is opened before the discharge port door is opened in step a, and inert gas is filled in the gas curtain device.
18. The method according to claim 16, wherein in the step b, the support member and the discharging member are used for discharging, the support member is first inserted from the discharge port at one end, the support member is inserted through the material layer until the discharge port at the other end stops, the upper material of the support member in the reaction chamber is supported, then the material in the support member or the lower material of the support member is discharged by the discharging member, then the discharging member and the support member are sequentially withdrawn, the upper material at the discharge port of the reaction chamber is filled again in the bottom space by its own weight, and the furnace door is closed to complete one discharging.
19. The discharging method for a direct reduction unit of a shaft furnace according to claim 18, wherein when the hollow sleeve is used for discharging in step b, the hollow sleeve is pushed in from the discharge port at the end of the discharging device, and stops when the hollow sleeve passes through the material and reaches the discharge port at the other end, the material in the hollow sleeve is pushed out by the material pushing disc, and then the material pushing disc and the hollow sleeve are sequentially withdrawn.
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| CN202010788629.2A CN111910037B (en) | 2020-08-07 | 2020-08-07 | Shaft furnace direct reduction device and discharging method thereof |
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| CN202010788629.2A CN111910037B (en) | 2020-08-07 | 2020-08-07 | Shaft furnace direct reduction device and discharging method thereof |
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| US6280181B1 (en) * | 1997-11-07 | 2001-08-28 | Deutsche Voest-Alpine Industrieanlagenbau Gmbh | Withdrawal device for a shaft furnace |
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| CN101832706A (en) * | 2010-04-30 | 2010-09-15 | 攀枝花市创盛粉末冶金有限责任公司 | External combustion tube type direct reduction shaft furnace |
| CN108580788A (en) * | 2018-07-03 | 2018-09-28 | 西安东威电炉设备有限公司 | A kind of multichannel passing-type furnace bottom and gas heating furnace |
| CN108642237A (en) * | 2018-07-09 | 2018-10-12 | 中冶京诚工程技术有限公司 | A kind of steelmaking equipment |
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|---|---|---|---|---|
| CN2273712Y (en) * | 1996-06-19 | 1998-02-04 | 王云龙 | Shaft furnace for riducing iron |
| PL338180A1 (en) * | 1997-07-14 | 2000-10-09 | Voest Alpine Ind Anlagen | Shaft furnace |
| US6280181B1 (en) * | 1997-11-07 | 2001-08-28 | Deutsche Voest-Alpine Industrieanlagenbau Gmbh | Withdrawal device for a shaft furnace |
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| CN111910037B (en) | 2022-01-25 |
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