CN216005917U

CN216005917U - Molten steel slag reduction ironmaking equipment

Info

Publication number: CN216005917U
Application number: CN202122351318.2U
Authority: CN
Inventors: 郭瑛; 王玉莲; 郭智宜
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-03-11
Anticipated expiration: 2031-09-27

Abstract

The utility model belongs to the technical field of reduction iron making of molten steel slag, in particular to a reduction iron making device of molten steel slag; the device comprises a slag pot, a stirring rod, a spray gun and an equipment platform, wherein a high-temperature-resistant protective pipe is arranged on the bottom surface of the equipment platform, the pipe orifice of the high-temperature-resistant protective pipe is in seamless butt joint with the pot orifice of the slag pot, and the pipe bottom of the high-temperature-resistant protective pipe is fully paved with high-temperature-resistant materials; the stirring rod and the spray gun are respectively hung under an independent lifting mechanism and penetrate through the equipment platform and the high-temperature-resistant protective pipe, the stirring rod moves up and down to stir the steel slag again, and the spray gun is inserted into the steel slag to spray the complexing agent to each layer; the slag pot is carried to the lower part of the equipment platform through a transport vehicle and is butted with the high-temperature-resistant protective pipe. The equipment does not need an external heat source, utilizes sensible heat of molten slag in steel making and a reducing agent to melt, reduce and iron making, utilizes combustion heat of a byproduct CO of reduced iron to compensate heat absorption of the reduced iron so as to maintain continuous reduction reaction, repeatedly stirs steel slag through a stirring rod, rotates a spray gun, sprays a complexing agent to each layer, and accelerates the reduction reaction rate through smoke exhaust and air inlet circulating heat exchange of a waste heat recycling device.

Description

Molten steel slag reduction ironmaking equipment

Technical Field

The utility model belongs to the technical field of melting steel slag reduction ironmaking, concretely relates to melting steel slag reduction ironmaking equipment.

Background

The steel-making slag-steel ratio of the electric arc furnace is about 8-10 percent, the steel-making slag-steel ratio of the converter is about 6-12 percent,

the electric arc furnace slag contains 24-30% of TFe, the converter slag contains 15-22% of TFe, and most of TFe in the slag exists in the form of FeO at high temperature.

The slag temperature of the electric arc furnace is about 1450 ℃, and the slag temperature of the converter is about 1600 ℃ (first slag) or 1300 ℃ (second slag, splashed slag and slag after furnace protection). No matter which steel-making slag mode, the discharged oxidized steel slag is molten and has certain fluidity.

Most of the molten slag discharged from the existing steel mill is naturally cooled in a steel slag casting tank, then is sprayed with water or slag stewing pits or slag stewing tanks or is pressed and hot stewed, is cooled, is crushed and magnetically separated to obtain a small amount of steel beans, and is pulled out of the steel mill to be used for other common purposes or discarded.

The iron oxide valuable substances in the slag are used or discarded along with the solid slag.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the unable problem of replacing the iron oxide in the melting slag of present equipment.

The utility model provides a molten steel slag reduction iron-making device, which comprises a slag pot, a stirring rod, a spray gun and a device platform with a suspended bottom, wherein the bottom surface of the device platform is provided with a high-temperature resistant protective pipe, the pipe orifice of the high-temperature resistant protective pipe is in seamless butt joint with the pot orifice of the slag pot, and the pipe bottom of the high-temperature resistant protective pipe is fully paved with high-temperature resistant materials; the stirring rod and the spray gun are respectively hung under an independent lifting mechanism and penetrate through the equipment platform and the high-temperature-resistant protective pipe, the stirring rod moves up and down to stir the steel slag again, and the spray gun is inserted into the steel slag to spray the complexing agent to each layer; the slag pot is carried to the lower part of the equipment platform through a transport vehicle and is butted with the high-temperature-resistant protective pipe.

Furthermore, two groups of waste heat recycling devices are arranged on the equipment platform, each group of waste heat recycling devices comprises a heat accumulator, a flue gas air pipe and a three-way reversing valve, one pipe orifice of the flue gas air pipe is introduced into a high-temperature-resistant protective pipe, the other pipe orifice of the flue gas air pipe is connected with the heat accumulator, and the pipe orifices of the three-way reversing valve are respectively connected with the heat accumulator, an air blower and an induced draft fan; the two groups of waste heat recycling devices alternately intake air and exhaust smoke circularly.

Furthermore, the nozzle of the spray gun sprays downwards in an inclined mode, the spray gun comprises an upper fixing section and a lower rotating section, the fixing section is connected with the lifting mechanism, the equipment platform is provided with a rotating mechanism, and the rotating mechanism inputs torque to the rotating section of the spray gun and is connected with the rotating section in a sliding mode.

Furthermore, the high-temperature-resistant protective pipe comprises a supporting framework and a lining pipe wall, wherein the lining pipe wall is formed by splicing high-temperature-resistant cotton blocks which are embedded and extruded in the supporting framework.

Furthermore, claw nails are welded on the bottom surface of the equipment platform in the high-temperature resistant protective pipe ring, and a pouring body formed by condensing high-temperature resistant materials is fixedly connected on the claw nails.

Furthermore, a guide sleeve is embedded in the equipment platform, and the stirring rods and the spray guns are sleeved in the guide sleeve in a one-to-one correspondence manner.

Furthermore, the bearing platform of the transport vehicle integrates lifting, rotating and weighing mechanisms.

Further, flue gas air pipe, guide pin bushing all are double-deck pipe wall structure, and inclosed annular space is as the circulation water cavity between the interior, outer pipe wall, and circulation water cavity and outside circulation water route UNICOM.

Compared with the prior art, the utility model has the advantages that:

the utility model provides a pair of melting steel slag reduction ironmaking equipment, this equipment do not need the external heat source, utilize steelmaking melting slag sensible heat to add reducing agent melting reduction ironmaking to utilize reduced iron byproduct CO combustion heat compensation reduced iron heat absorption, in order to maintain the reduction reaction and continuously go on. The nozzle of the spray gun sprays obliquely downwards, the rotating mechanism inputs torque to the spray gun and is connected with the spray gun in a sliding mode, the spray gun does not spray at a fixed point, the spraying range is a concentric circle surface taking the spray gun as a circle center, the spray gun sprays and rotates simultaneously, and the complexing agent is uniformly sprayed into the molten steel slag. The bearing platform of transport vechicle collects lift, rotation, weighing mechanism in an organic whole, and rotary mechanism in the transport vechicle drives the sediment jar rotation, and the melting slag produces relative motion with the stirring rod that inserts into it, has played the effect of stirring melting slag, helps reactant and resultant to diffuse in the melting slag. In addition, the spray gun rotates to spray the complexing agent, the rotation direction of the spray gun is opposite to that of the molten steel slag, the effect of turbulent stirring is formed, and the diffusion mass transfer is facilitated. In addition, in the whole iron reducing process, the computer program-controlled oil cylinder drives the stirring rod and the spray gun to reciprocate up and down in the molten steel slag, so that the function of stirring up and down in the molten steel slag is achieved, and the complexing agent sprayed by the spray gun is more uniformly distributed on each layer surface in the molten steel slag. Further accelerating the contact of the complexing agent and FeO in the molten steel slag and the reduction reaction of iron. Through the heat exchange of the circulating air intake and smoke exhaust of the two groups of waste heat recycling devices, the combustion temperature of the coal gas in hot air is higher than that of cold air, so that the combustion heat is more favorably transferred to molten steel slag, the temperature of the steel slag is maintained, and the reduced iron reaction is continuously carried out.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the equipment platform and the installed equipment.

Fig. 3 is a schematic structural diagram of a transport vehicle and a slag pot.

Fig. 4 is a schematic view of the working dynamics of the present invention.

In the figure: 1-a device platform; 2-high temperature resistant protective pipe; 3-a stirring rod; 4-casting a high-temperature resistant material; 5-a spray gun; 6-three-way reversing valve; 7-a regenerator; 8-flue gas air pipe; 9-oil cylinder; 10-a rotation mechanism; 11-a slag pot; 12-complexing agent; 13-transport vehicle; 14-an air duct; 15-flue gas duct; 16-molten steel slag; 17-CO bubbles.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

As shown in fig. 1-4; a smelting steel slag reduction iron-making device comprises a slag tank 11, a stirring rod 3, a spray gun 5 and a device platform 1, wherein the bottom of the device platform 1 is suspended and supported by four-corner supporting columns. The bottom surface of the equipment platform 1 is provided with a high-temperature resistant protective pipe 2, the pipe orifice of which is in seamless butt joint with the tank orifice of the slag tank 11, and the pipe bottom of which is fully paved with high-temperature resistant materials; the stirring rod 3 and the spray gun 5 are respectively hung under an independent lifting mechanism and penetrate through the equipment platform 1 and the high-temperature-resistant protective pipe 2, a guide sleeve is embedded in the equipment platform 1, the stirring rod 3 and the spray gun 5 are inserted into the guide sleeve in a one-to-one correspondence mode, the stirring rod 3 moves up and down to stir the steel slag again, the spray gun 5 stretches into the steel slag to spray a complexing agent to each layer, a nozzle of the spray gun 5 sprays obliquely and downwards, the spray gun 5 comprises an upper fixing section and a lower rotating section, the fixing section is connected with the lifting mechanism and does not rotate but can move up and down, a rotating mechanism 10 is arranged on the equipment platform 1, and the rotating mechanism 10 inputs torque to the rotating section of the spray gun 5 and is connected with the rotating section in a sliding mode. The spray gun 5 does not spray at a fixed point, the spraying range is a concentric circle surface taking the spray gun 5 as a circle center, the spray gun 5 sprays and rotates simultaneously, and the complexing agent is uniformly sprayed into the molten steel slag. The slag pot 11 is carried to the lower part of the equipment platform 1 through a transport vehicle 13 and is butted with the high-temperature resistant protective pipe 2.

The bearing platform of the transport vehicle 13 integrates lifting, rotating and weighing mechanisms, and the slag pot 11 is arranged on the transport vehicle 13, so that the weight of the molten steel slag in the pot (the tare weight returns to zero) can be weighed, and the spraying amount of the complexing agent in each pot of molten steel slag can be calculated conveniently; can move forward and backward along with the vehicle, can be lifted and lowered, and can be rotated for a certain angle or continuously rotated. After the slag of the steel furnace is discharged into the slag pot 11, the slag pot 11 is lifted to the transport vehicle 13 by the travelling crane and is assisted by the sliding positioner on the bearing platform, so that the slag pot 11 is ensured to be placed at the central position of the transport vehicle 13. After the travelling crane is unhooked and leaves, the transport vehicle 13 carries the slag pot 11 to drive to the equipment platform 1, when the tank mouth aims at the high temperature resistant protective pipe 2, the transport vehicle 13 stops, the lifting mechanism on the transport vehicle 13 slowly jacks up the slag pot 11 until the tank mouth is in butt joint with the high temperature protective pipe 2, the sealing is realized, and the lifting mechanism stops rising.

The lifting mechanism is an oil cylinder 9 hung on a frame of the equipment platform 1, when the lifting mechanism is in actual use, the oil cylinder 9 extends out of a piston rod to push the stirring rod 3 and the spray gun 5 to be inserted into high-temperature molten steel slag, and particularly, before the stirring rod and the spray gun are inserted, compressed air or oxygen-enriched air must be introduced into the spray gun 5 firstly, so that the molten steel slag is prevented from entering a spray pipe of the spray gun 5 and being condensed to block the spray gun. After the spray gun 5 is inserted into the molten steel slag, the complexing agent blanking valve on the compressed air pipe is opened, and the compressed air carries the complexing agent particles to be sprayed into the molten steel slag. The complexing agent is a complex of a reducing agent, a catalyst and a stirring agent. The complexing agent reacts with FeO in the molten steel slag to rapidly and directly reduce iron (absorb heat) to produce iron and CO (coal gas) as a byproduct, and partial CO as the byproduct further reacts with FeO in the slag to rapidly and indirectly reduce iron (release heat) with the help of the catalyst to produce CO2 as a byproduct.

In the state of reducing iron by molten steel slag (a slag tank on the top of a transport vehicle, a tank opening is tightly attached and sealed with a high-temperature-resistant protective pipe), a rotating mechanism in the transport vehicle 13 drives the slag tank to rotate, the molten steel slag and the stirring rod 3 inserted into the molten steel slag generate relative motion, the effect of stirring the molten steel slag is achieved, and reactants and products are facilitated to diffuse in the molten steel slag. In addition, the spray gun 5 rotates to spray the complexing agent, the rotation direction of the spray gun 5 is opposite to that of the molten steel slag, the effect of turbulent stirring is formed, and the diffusion mass transfer is facilitated. In addition, in the whole reduction iron process, the computer program-controlled oil cylinder 9 drives the stirring rod 3 and the spray gun 5 to reciprocate up and down in the molten steel slag, so that the function of stirring up and down in the molten steel slag is achieved, and the complexing agent sprayed by the spray gun 5 is more uniformly distributed on each layer surface in the molten steel slag. Further accelerating the contact of the complexing agent and FeO in the molten steel slag and the reduction reaction of iron.

In the whole process of reducing iron, the spray gun 5 continuously sprays complexing agent into the molten steel slag, and the complexing agent reduces FeO to produce iron and CO as a byproduct. Wherein a small part of CO is used as a reducing agent to continuously reduce other FeO, most of CO is gathered into bubbles to float out of the liquid level of the molten steel slag and is used as fuel and combustion-supporting air to burn in the space formed by the liquid level of the slag and the high-temperature-resistant protective pipe 2, the combustion heat is transferred to the liquid level of the slag and even the molten steel slag in various modes of radiation, convection and heat transfer, especially, the bubbles splashed by boiling are overflowed to cause that the liquid drops of the boiling slag are surrounded by flame to exchange heat more easily, the heat absorption of the direct reduced iron reaction is compensated, the molten steel slag is prevented from being rapidly cooled until being solidified, and the reduced iron reaction can not be continuously carried out.

In order to increase the combustion temperature of the coal gas, oxygen-enriched air can be blown in, and the equipment is also provided with a waste heat recycling device for heat storage and heat transfer by discontinuously reversing airflow. Namely, two groups of waste heat recycling devices are arranged on the equipment platform 1, each group of waste heat recycling devices comprises a heat accumulator 7, a flue gas air pipe 8 and a three-way reversing valve 6, one pipe orifice of the flue gas air pipe 8 is introduced into the high-temperature-resistant protective pipe 2, and the other pipe orifice is connected with the heat accumulator 7. The three-way reversing valve 6 is a pneumatic three-way reversing valve, a bottom pipe orifice of the three-way reversing valve 6 is connected with an induced draft fan through a flue gas pipeline 15, a top pipe orifice is connected with an air blower through an air pipeline 14, and a middle pipe orifice is connected with the heat accumulator 7. The two groups of waste heat recycling devices alternately intake air and exhaust smoke circularly.

Most of the heat generated by coal gas combustion is transferred to the molten steel slag 16, and a small part of waste heat is discharged from a waste heat recycling device in a smoke discharging stage along with the smoke; the specific process is as follows: the waste heat enters the heat accumulator 7 through a flue gas air pipe 8 along with the flue gas, most of the waste heat carried by the flue gas is transferred to a heat accumulator in the heat accumulator 7, the heat accumulator heats the flue gas and cools the flue gas, and then the flue gas is sucked by the induced draft fan and sent to the flue gas treatment system through a bottom pipe orifice of the three-way reversing valve 6. Meanwhile, combustion-supporting air from the blower is sucked into the slag tank by the waste heat recycling device in the air inlet stage; the specific process is as follows: combustion-supporting air enters the heat accumulator 7 with heat accumulated from the pipe orifice at the top of the three-way reversing valve 6, absorbs the heat of the high-temperature heat accumulator, cools the heat accumulator, and enters a combustion space through a flue gas air pipe 8 after the air is heated, so as to support combustion of coal gas. The combustion temperature of the coal gas in the hot air is higher than that in the cold air, so that the combustion heat is more favorably transferred to the molten steel slag, the temperature of the steel slag is maintained, and the reduced iron reaction is continuously carried out.

When the reaction of the reduced iron is finished, the compounding agent blanking valve is closed under the program control of the computer, the stirring rod 3 and the spray gun 5 are lifted from the molten steel slag by the oil cylinder 9, the compressed air is stopped after the spray gun 5 is lifted to the right position without stopping. The transport vehicle 13 descends the slag pot 11 to the proper position and then moves out of the equipment platform 1, and the traveling vehicle lifts the slag pot to the next procedure for separating liquid slag and iron.

The high-temperature-resistant protective pipe 2 comprises a supporting framework and a lining pipe wall, and the lining pipe wall is formed by splicing high-temperature-resistant cotton blocks which are embedded and extruded in the supporting framework. The supporting framework comprises an outer pipe wall formed by coaxially overlapping C-shaped steel curled circular rings, the outer pipe wall and the hanging frame are welded into a whole, the high-temperature-resistant cotton blocks are fixed on the inner wall of the outer pipe wall through stainless steel screws, and one high-temperature-resistant cotton block (folding type) is mutually squeezed tightly by virtue of folding elasticity.

The bottom surface of the equipment platform in the 2 circles of the high-temperature resistant protective pipe is welded with the claw nails, and a casting body formed by condensing high-temperature resistant materials is fixedly connected on the claw nails; specifically, the high-temperature resistant material is prepared by high-temperature resistant fibers, refractory cement and water according to a certain proportion.

Flue gas air pipe 8, guide pin bushing all are double-deck pipe wall structure, and inclosed annular space is as the circulation water cavity between the inside and outside pipe wall, and circulation water cavity and outside circulation water route UNICOM, the water-cooling circulation gives flue gas air pipe and guide pin bushing heat dissipation.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A molten steel slag reduction ironmaking equipment is characterized in that: the device comprises a slag pot (11), a stirring rod (3), a spray gun (5) and an equipment platform (1) with a suspended bottom, wherein a high-temperature-resistant protective pipe (2) with a pipe orifice in seamless butt joint with a pot orifice of the slag pot (11) and a pipe bottom fully paved with high-temperature-resistant materials is arranged on the bottom surface of the equipment platform (1); the stirring rod (3) and the spray gun (5) are respectively hung under an independent lifting mechanism and penetrate through the equipment platform (1) and the high-temperature-resistant protective pipe (2), the stirring rod (3) moves up and down to stir the steel slag again, and the spray gun (5) extends into the steel slag to spray a complexing agent to each layer; the slag pot (11) is carried to the position below the equipment platform (1) through a transport vehicle (13) and is butted with the high-temperature-resistant protective pipe (2).

2. The molten steel slag reduction ironmaking apparatus according to claim 1, characterized in that: two groups of waste heat recycling devices are arranged on the equipment platform (1), each group of waste heat recycling devices comprises a heat accumulator (7), a flue gas air pipe (8) and a three-way reversing valve (6), one pipe orifice of the flue gas air pipe (8) is introduced into the high-temperature-resistant protective pipe (2), the other pipe orifice is connected with the heat accumulator (7), and the pipe orifices of the three-way reversing valve (6) are respectively connected with the heat accumulator (7), an air blower and an induced draft fan; the two groups of waste heat recycling devices alternately intake air and exhaust smoke circularly.

3. The molten steel slag reduction ironmaking apparatus according to claim 2, characterized in that: the spray nozzle of the spray gun (5) sprays downwards in an inclined mode, the spray gun (5) comprises a fixed section on the upper portion and a rotating section on the lower portion, the fixed section is connected with a lifting mechanism, a rotating mechanism (10) is arranged on the equipment platform (1), and the rotating mechanism (10) inputs torque to the rotating section of the spray gun (5) and is connected with the rotating section in a sliding mode.

4. The molten steel slag reduction ironmaking apparatus according to claim 2 or 3, characterized in that: the high-temperature-resistant protective pipe (2) comprises a supporting framework and a lining pipe wall, and the lining pipe wall is formed by splicing high-temperature-resistant cotton blocks which are embedded and extruded in the supporting framework.

5. The molten steel slag reduction ironmaking apparatus according to claim 4, characterized in that: the bottom surface of an equipment platform in the ring of the high-temperature resistant protective pipe (2) is welded with claw nails, and a pouring body formed by condensing high-temperature resistant materials is fixedly connected on the claw nails.

6. The molten steel slag reduction ironmaking apparatus according to claim 5, characterized in that: the equipment platform (1) is embedded with a guide sleeve, and the stirring rods (3) and the spray guns (5) are inserted in the guide sleeve in a one-to-one correspondence manner.

7. The molten steel slag reduction ironmaking apparatus according to claim 1, characterized in that: the bearing platform of the transport vehicle (13) integrates lifting, rotating and weighing mechanisms.

8. The molten steel slag reduction ironmaking apparatus according to claim 6, characterized in that: flue gas air pipe (8), guide pin bushing all are double-deck pipe wall structure, and inclosed annular space between the interior, outer pipe wall is as the circulation water cavity, circulation water cavity and outside circulation water route UNICOM.