Discharging device for production of reduced iron by large-scale reaction tank method

Abstract

The utility model discloses a discharging device for producing reduced iron by a large-scale reaction tank method, which relates to the technical field of direct reduced iron production equipment and is characterized by comprising a group of reduction reaction tanks fixedly connected with a trolley surface; the upper side of the trolley body is fixedly connected with the trolley surface, and a plurality of blanking holes are uniformly distributed in the trolley body; a plurality of reduction reaction tanks are regularly arranged on the surface of each trolley and respectively correspond to blanking holes, and concentric circles of the reduction reaction tanks and the blanking holes are kept; the trolley body is fixedly connected with the trolley steel structure; and the gate valve assemblies are in bilateral symmetry. The technical problem to be solved by the utility model is to provide the unloading device for producing the reduced iron by the large-scale reaction tank method, and the unloading device adopts a mechanical and automatic unloading device for producing the direct reduced iron by reducing the large-scale bottomless reaction tank, and has the characteristics of simplicity, stability, reliability, practicability, low failure rate, few stations, short working procedure, extremely high unloading speed and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of direct reduced iron production equipment, specifically to a discharge device for large-scale reaction tank method of reduced iron production. Background Technology

[0002] Currently, when carbon-based tunnel kilns and carbon-based ring kilns use large bottomless reduction reactors to produce sponge iron (direct reduced iron, DRI) products, the process flow for unloading the reduced material and trolley after deep reduction cooling (unloading the reduced iron ingots or sponge iron ingots from the reduction reactor) is as follows: First, a negative pressure pneumatic conveying device is used to extract 1 / 3 of the residual reducing agent from each column or row of the reduction reactor. Then, a clamping mechanism is used, and through the lifting mechanism of a crane, the clamping head of the clamping mechanism system is inserted into the central hole of the reduced iron ingot or sponge iron ingot in the large reduction reactor to lift the reduced iron ingot or sponge iron ingot and pull it out of the reactor. It is then placed in the reduced iron cleaning station for further processing. Finally, a negative pressure pneumatic conveying device is used again to extract the remaining residual reducing agent from each reduction reactor. This process involves many unloading stations, a long and complicated process, and a long unloading time. The equipment investment is also over one million yuan.

[0003] Recently, direct reduced iron (DRI) technology has been continuously advancing and developing. With the promotion of large-scale bottomless reaction tank methods such as carbon-based tunnel kiln and carbon-based ring kiln for the rapid reduction of sponge iron (DRI), the aim is to maximize output and reduce costs. However, the existing loading and unloading systems and technologies, due to their numerous workstations, long processes, large floor space, and long loading and unloading times, can no longer meet the requirements of advanced rapid reduction methods that demand the minimization of loading and unloading operations. This has seriously hindered the promotion and application of rapid reduction technology. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a discharge device for the production of direct reduced iron (sponge iron) by large reaction vessel method. The device is a mechanized and automatic discharge device for the production of direct reduced iron (sponge iron) by large bottomless reaction vessel. It has the characteristics of being simple, stable, reliable and practical, having a low failure rate, fewer workstations, shorter process, and extremely fast discharge speed.

[0005] This utility model achieves its purpose through the following technical solution:

[0006] A discharge device for large-scale reaction vessel method for reducing iron production, characterized in that it comprises: a set of reduction reaction vessels fixedly connected to a trolley surface; a trolley body, the upper side of which is fixedly connected to the trolley surface, the trolley body having a plurality of discharge holes evenly distributed thereon; multiple reduction reaction vessels arranged regularly on each trolley surface, each corresponding to a discharge hole, maintaining concentric circles between the reduction reaction vessels and the discharge holes; a trolley steel structure, the trolley body being fixedly connected to the trolley steel structure; and symmetrical gate valve assemblies installed between the bottom surface of the trolley body and the trolley steel structure.

[0007] As a further limitation of this technical solution, it also includes a material discharge bin, which is installed at the top of the pit. A sponge iron shredder and a belt conveyor are installed at the bottom of the pit. A flow screen is installed in the material discharge bin, and the material discharge bin and the flow screen form a sponge iron ingot outlet.

[0008] As a further limitation of this technical solution, the flow screen is fixedly connected to the residual reducing agent collection chamber, and the residual reducing agent collection chamber is connected to the residual reducing agent outlet through a pneumatic conveying device.

[0009] As a further limitation of this technical solution, a dust collection pipe is installed above the material hopper.

[0010] As a further limitation of this technical solution, the trolley body is equipped with a set of trolley wheels, and the trolley wheels of the multiple sets of trolley bodies in the longitudinal direction travel on the trolley running track.

[0011] As a further limitation of this technical solution, the gate valve assembly includes a left gate valve and a right gate valve. The trolley body is equipped with multiple single gate valve plates symmetrically arranged on the left and right sides corresponding to a set of material discharge holes. The left gate valve and the right gate valve respectively lock the corresponding single gate valve plates.

[0012] As a further limitation of this technical solution, the left gate valve and the right gate valve are each equipped with at least two sets of lower positioning rollers for the gate valve.

[0013] As a further limitation of this technical solution, the trolley body forms an inner wall corresponding to each of the material discharge holes, and each inner wall of the trolley directly and vertically corresponds to the inner hole of each column reduction reaction vessel.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are:

[0015] This device is simple and practical, with an extremely short unloading time. It requires only one station and one action, and can completely reduce all the reduced iron ingots, sponge iron ingots, metallized pellets, and residual reducing agent in the reduction reaction tanks on the back-end vehicle surface within 3-4 seconds.

[0016] This invention effectively solves the problem that, regardless of whether it is the powdered ore casing filling method, or the wet ore powder pre-compression block method, briquetting method, pelletizing method, or other mechanical filling and loading methods, after the ore is deeply reduced and cooled in the reduction kiln, the traditional single-set unloading cycle time has been reduced from 40-50 minutes to only 3-4 seconds. This allows for the complete unloading of all sponge iron ingots and residual reducing agent from the large bottomless reaction tanks on the trolley, fully meeting the requirements for rapid reduction unloading time. Attached Figure Description

[0017] Figure 1 This is a side view of the tunnel kiln unloading method of this utility model, showing the separation and crushing of sponge iron.

[0018] Figure 2 This is a side view of the annular kiln unloading method of this utility model, showing the separation and crushing of sponge iron.

[0019] Figure 3 This is a top view of the trolley surface of this utility model.

[0020] Figure 4 This is a schematic diagram of the slide gate valve of this utility model.

[0021] Figure 5 This is a schematic diagram of the end face of the slide valve of this utility model.

[0022] In the diagram: 1. Trolley surface, 2. Reduction reaction tank, 3. Reduced iron ingot, 4. Trolley body, 5. Heat-resistant steel reinforcement frame, 6. Trolley steel structure, 7. Trolley inner wall, 8. Discharge hole, 9. Gate valve assembly, 9-1. Left gate valve, 9-2. Right gate valve, 10. Discharge bin, 11. Dust collection pipe, 12. Flow screen, 13. Pit, 14. Sponge iron ingot outlet, 15. Residual reducing agent outlet, 16. Ground, 17. Sponge iron shredder, 18. Belt conveyor, 19. Residual reducing agent accumulation bin, 20. Single gate valve plate, 21. Residual reducing agent, 22. Lower positioning roller of slide valve, 23. Trolley wheel, 24. Trolley track. Detailed Implementation

[0023] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0024] This utility model includes: a set of reduction reaction tanks 2, fixedly connected to a trolley surface 1, with multiple column reduction reaction tanks 2 arranged regularly on the trolley surface 1, the position and arrangement of each column reduction reaction tank 2 also having requirements and regularity, and the reducing agent and the iron material to be reduced are produced according to process requirements; a trolley body 4, the upper side of which is fixedly connected to the trolley surface 1, with multiple material discharge holes 8 evenly distributed on the trolley body 4; multiple column reduction reaction tanks 2 arranged regularly on each trolley surface 1, each corresponding to a material discharge hole 8, and maintaining the concentricity of the reduction reaction tanks 2 and the material discharge holes 8; a trolley steel structure 6, which is fixedly connected to the trolley body 4; and a left-right symmetrical gate valve assembly 9, installed between the bottom surface of the trolley body 4 and the trolley steel structure 6. The trolley body 4 is made of high-temperature resistant castable refractory and is integrally cast onto the trolley steel structure 6. The trolley body 4 is integrally cast with a heat-resistant steel reinforcement frame 5 inside, and multiple corresponding material dropping holes 8 are reserved on the trolley body 4, which are open from top to bottom.

[0025] It also includes a material discharge bin 10, which is installed at the top of the pit 13. A sponge iron shredder 17 and a belt conveyor 18 are installed at the bottom of the pit 13. The belt conveyor 18 is located directly below the discharge port of the sponge iron shredder 17. A flow screen 12 is installed in the material discharge bin 10. The material discharge bin 10 and the flow screen 12 form a sponge iron ingot outlet 14.

[0026] The flow screen 12 is fixedly connected to the residual reducing agent collection chamber 19, and the residual reducing agent collection chamber 19 is connected to the residual reducing agent outlet 15 through a pneumatic conveying device.

[0027] A dust collection pipe 11 is installed above the material discharge hopper 10.

[0028] The trolley body 4 is equipped with a set of trolley wheels 23, and the trolley wheels 23 of the multiple sets of trolley bodies 4 travel on the trolley track 24.

[0029] The gate valve assembly 9 includes a left gate valve 9-1 and a right gate valve 9-2. The trolley body 4 has multiple symmetrically arranged single-group gate valve plates 20 installed corresponding to a set of material discharge holes 8. The left gate valve 9-1 and the right gate valve 9-2 respectively engage with their corresponding single-group gate valve plates 20. A pneumatic or hydraulic reciprocating lever mechanism is used to move the left gate valve 9-1 and the right gate valve 9-2. The fixed end of the pneumatic or hydraulic reciprocating lever mechanism is welded to the rails welded to the trolley steel structure 6. The left gate valve 9-1 and the right gate valve 9-2 are nested within the rails, and the free end of the pneumatic or hydraulic reciprocating lever mechanism is connected to the left gate valve 9-1 and the right gate valve 9-2.

[0030] The left gate valve 9-1 and the right gate valve 9-2 are each equipped with at least two sets of lower positioning rollers 22.

[0031] The trolley body 4 forms an inner wall 7 corresponding to each of the discharge holes 8, and each inner wall 7 directly and vertically corresponds to the inner hole of each reduction reactor 2. The diameter of the inner wall 7 of the trolley is equal to or slightly smaller than the inner hole diameter of each reduction reactor 2 by 10-20 mm. The inner wall 7 of the trolley can be any high-strength, heat-resistant and temperature-resistant material.

[0032] The working process of this utility model is as follows:

[0033] During normal operation, that is, before each column of reduction reaction tank 2 discharges the reduced iron ingot (which can also be a sponge iron ingot or metallized pellets 3) and the residual reducing agent 21, the discharge hole 8 is continuously filled with carbon-based materials such as coal powder, biomass carbon powder, and biomass pellets. The particle size or fineness is 0-10mm. The height of the upper surface of the carbon-based material filled in the discharge hole 8 should be level with or slightly higher than the trolley surface 1 by 10-30mm.

[0034] After the trolley body 4 has been deeply restored and cooled, it runs to the exact position of the unloading area. The trolley body 4 is exactly at the center above the material drop hopper 10. The dust induced draft fan is turned on, and the dust collection pipe 11 begins to draw air and remove dust.

[0035] A pneumatic or hydraulic reciprocating lever mechanism is used to cyclically insert or withdraw the left gate valve 9-1 and the right gate valve 9-2.

[0036] At this moment, the reduced iron ingots, sponge iron ingots or metallized pellets 3 and residual reducing agent 21 in each reduction reaction tank 2, when they lose the support of the filling material in the discharge hole 8, all fall through the discharge hole 8 and into the flow screen 12 under the discharge bin 10 in an instant. The residual reducing agent 21 passes through the flow screen 12 and gathers in the residual reducing agent collection bin 19. Then, it is transported to the silo by the pneumatic conveying equipment and used as a reducing agent and filler for recycling.

[0037] When the reduced iron ingot, sponge iron ingot, or metallized pellet 3 and the residual reducing agent 21 lose the support of the material filling the discharge hole 8, they will all automatically pass through the discharge hole 8 and fall together into the flow screen 12 under the discharge bin 10 in an instant. The residual reducing agent 21 passes through the flow screen 12 and accumulates in the residual reducing agent collection bin 19.

[0038] The reduced iron ingots, sponge iron ingots or metallized pellets 3 and residual reducing agent 21 in each reduction reaction tank 2 are completely discharged. The pneumatic or hydraulic reciprocating lever mechanism then inserts the left gate valve 9-1 and the right gate valve 9-2, which are symmetrically arranged in the gate valve assembly 9, back into their original positions to reset them and start the next unloading production cycle.

[0039] The filler material in the discharge hole 8, the reduced iron ingot, the sponge iron ingot or the metallized pellet 3 and the residual reducing agent 21 fall simultaneously onto the flow screen 12 of the discharge bin 10 under the pit 13 of the ground 16, and the residual reducing agent 21 is screened out and flows into the residual reducing agent collection bin 19 by gravity. After being processed by the pneumatic conveying device, it is connected to the residual reducing agent outlet 15 and then recycled.

[0040] All the materials in the reduction reaction tanks 2 on the trolley surface 1 of the trolley body 4 fall smoothly into the discharge bin 10 through the corresponding discharge hole 8. Then, the gate valve assembly 9 is closed, and the discharge hole 8 is filled with reducing agent so that its height exceeds the trolley surface 1 by 20-50mm. The trolley body 4 can then move longitudinally along the trolley track by the trolley wheels 23 to enter the next working cycle.

[0041] The reduced iron ingots, sponge iron ingots, or metallized pellets 3 are then rolled out of the sponge iron ingot outlet 14 through the flow screen 12 and fall directly into the sponge iron shredder 17 to be shredded into small particles, which then fall into the belt conveyor 18 below for output and further processing.

[0042] After the trolley completes the unloading, the single gate valve plate 20 is closed. The quantitative feeding device above can be used to fill the discharge hole 8 with carbon-based filler material before proceeding to the next canning and loading production cycle.

[0043] Carbonaceous dust is formed inside the material hopper 10, rises to the hopper opening, and is sucked in by multiple dust collection pipes 11 for recycling and reuse.

[0044] The above-disclosed embodiments are merely specific examples of this utility model. However, this utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. A discharge device for large-scale reaction vessel method for reducing iron production, characterized in that, include: A set of reduction reaction vessels (2) are fixedly connected to the trolley surface (1); The trolley body (4) is fixedly connected to the trolley surface (1) on its upper side. The trolley body (4) has a plurality of material dropping holes (8) evenly distributed on it. Each trolley surface (1) has a regular arrangement of multiple columns of the reduction reaction tank (2) and each column has a corresponding material dropping hole (8), and the reduction reaction tank (2) and the material dropping hole (8) are kept in a concentric circle. The trolley steel structure (6) is fixedly connected to the trolley body (4); A symmetrical gate valve assembly (9) is installed between the bottom surface of the trolley body (4) and the trolley steel structure (6).

2. The unloading device for large-scale reactor-based reduced iron production according to claim 1, characterized in that: It also includes a material discharge bin (10), which is installed at the top of the pit (13). A sponge iron shredder (17) and a belt conveyor (18) are installed at the bottom of the pit (13). A flow screen (12) is installed on the material discharge bin (10). The material discharge bin (10) and the flow screen (12) form a sponge iron ingot outlet (14).

3. The unloading device for large-scale reactor-based reduced iron production according to claim 2, characterized in that: The flow screen (12) is fixedly connected to the residual reducing agent collection chamber (19), and the residual reducing agent collection chamber (19) is connected to the residual reducing agent outlet (15) through a pneumatic conveying device.

4. The unloading device for large-scale reactor-based reduced iron production according to claim 2, characterized in that: A dust collection pipe (11) is installed above the material discharge hopper (10).

5. The unloading device for large-scale reactor-based reduced iron production according to claim 1, characterized in that: The trolley body (4) is equipped with a set of trolley wheels (23), and the trolley wheels (23) of the multiple sets of trolley bodies (4) in the longitudinal direction travel on the trolley track (24).

6. The unloading device for large-scale reactor-based reduced iron production according to claim 1, characterized in that: The gate valve assembly (9) includes a left gate valve (9-1) and a right gate valve (9-2). The trolley body (4) is equipped with multiple single gate valve plates (20) that are symmetrically arranged on the left and right sides, corresponding to a set of material discharge holes (8). The left gate valve (9-1) and the right gate valve (9-2) respectively lock the corresponding single gate valve plate (20).

7. The unloading device for large-scale reactor-based reduced iron production according to claim 6, characterized in that: The left gate valve (9-1) and the right gate valve (9-2) are each equipped with at least two sets of lower positioning rollers (22).

8. The unloading device for large-scale reactor-based reduced iron production according to claim 1, characterized in that: The trolley body (4) forms an inner wall (7) for each of the material discharge holes (8), and each inner wall (7) of the trolley directly and vertically corresponds to the inner hole of each column reduction reaction tank (2).

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