A feeding device for secondary addition of fuel to a sintering process material surface

Abstract

The application provides a feeding device for sintering process material surface fuel secondary addition, which comprises a screw conveyor, a roller feeder and a chute, wherein the screw conveyor, the roller feeder and the chute are transversely arranged above the trolley; the roller feeder and the chute are arranged side by side, the lower part of the screw conveyor is arranged in the chute, and one end of the chute is provided with a feeding port; fuel is added into the chute through the feeding port, the screw conveyor conveys the fuel to the roller feeder through rotation, and the roller feeder uniformly spreads the fuel on the surface of the sintering mixture in the trolley through rotation. The feeding device uniformly spreads the fuel in the width direction of the trolley, the sintering process is stable, and the phenomenon of local overmelting is eliminated. Dry quenching is used as the fuel for sintering process material surface fuel secondary addition, so that the problems of low strength and excessive powder of the surface layer sinter caused by insufficient burning are avoided.

Description

Technical Field

[0001] This invention relates to the field of smelting equipment technology, and in particular to a feeding device for secondary addition of fuel to the sintering process. Background Technology

[0002] In traditional sintering processes, fuels (such as coke powder and anthracite) are typically mixed uniformly with raw materials such as iron ore powder and flux in a single batch before being distributed. This "one-time addition and uniform mixing" model has inherent drawbacks: the bottom of the sintering bed has sufficient heat due to the "automatic heat storage effect." If the overall fuel ratio is reduced, the surface mixture will lack sufficient heat due to short combustion time, ultimately resulting in low strength and excessive powder in the surface sinter.

[0003] The secondary fuel addition technology on the sintering bed surface is considered key to solving the above problems. By separately and precisely spreading a portion of the fuel on the surface of the sintering mixture, stratified fuel control can be achieved, optimizing the heat distribution throughout the sintering bed. This not only improves the quality of the surface sintered ore but also appropriately reduces the flame intensity and temperature of the igniter, thereby saving fuel consumption.

[0004] However, existing technologies struggle to achieve uniform fuel distribution on the material surface, leading to localized fuel segregation, instability in the sintering process, and even localized overmelting. Summary of the Invention

[0005] The purpose of this invention is to provide a feeding device for secondary fuel addition in the sintering process. This feeding device effectively avoids the problem of local overmelting caused by uneven fuel distribution, and maximizes the energy-saving and consumption-reducing benefits of secondary fuel addition technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A feeding device for secondary fuel addition in a sintering process is disclosed. The feeding device is positioned above a trolley and is used to add fuel to the surface of the sintering mixture within the trolley. It includes a screw conveyor, a roller feeder, and a trough. The screw conveyor, roller feeder, and trough are all horizontally positioned above the trolley. The roller feeder and trough are arranged side-by-side, with the lower part of the screw conveyor located within the trough. One end of the trough has a feed inlet. Fuel is added to the trough through the feed inlet. The screw conveyor, by rotating, transports the fuel to the roller feeder, which, by rotating, evenly distributes the fuel onto the surface of the sintering mixture within the trolley.

[0007] Furthermore, in the feeding device for secondary fuel addition in the sintering process described above, the fuel is fine coke powder with a particle size of less than 5 mm.

[0008] Furthermore, in the feeding device for secondary fuel addition in the sintering process described above, the two ends of the rotating shaft of the screw conveyor are supported by first bearing seats, and the drive end of the rotating shaft of the screw conveyor is connected to the first motor through a first reducer; the two ends of the rotating shaft of the roller feeder are supported by second bearing seats, and the drive end of the rotating shaft of the roller feeder is connected to the second motor through a second reducer; the length of the screw conveyor and the length of the roller feeder are both consistent with the width of the trolley; the first motor and the second motor are located on both sides of the trolley.

[0009] Furthermore, in the feeding device for secondary fuel addition in the sintering process described above, the axis of the screw conveyor and the axis of the roller feeder are located in the same plane, and the axis of the screw conveyor and the axis of the roller feeder are parallel; the rotation directions of the screw conveyor and the roller feeder are the same.

[0010] Furthermore, in the feeding device for secondary fuel addition in the sintering process described above, the trough is a top-opening trough structure with a semi-circular cross-section. Both ends of the trough are sealed by side plates. A vertical plate is connected to the upper end of the side of the trough away from the roller feeder, and the length of the vertical plate is the same as the length of the trough. The trough is in contact with the outer wall of the roller feeder.

[0011] Furthermore, in the feeding device for secondary addition of fuel to the sintering process described above, a spiral blade is provided on the outer wall of the screw conveyor. One end of the material trough is close to the drive end of the rotating shaft of the screw conveyor. The spiral blade is composed of a first section of blades and a second section of blades. The first section of blades is close to one end of the material trough. The first section of blades is a positive spiral, and the second section of blades is a negative spiral.

[0012] Furthermore, in the feeding device for secondary fuel addition in the sintering process described above, the length ratio of the first section of blades to the second section of blades is 7:1.

[0013] Furthermore, in the feeding device for secondary fuel addition in the sintering process described above, the surface of the roller feeder is evenly covered with several grooves. The axis of the grooves is parallel to the axis of the roller feeder, the length of the grooves is the same as the length of the roller feeder, the cross-section of the inner wall of the groove is a minor arc, the chord length corresponding to the minor arc is 8mm, and the height between the bottom of the groove and the outer edge of the roller of the roller feeder is 5mm. The amount of fuel added is adjusted by adjusting the rotation speed of the roller feeder.

[0014] Furthermore, in the feeding device for secondary fuel addition in the sintering process described above, a dovetail groove is provided on the second bearing seat, through which the distance between the roller feeder and the trough can be adjusted.

[0015] Furthermore, the feeding device for the secondary addition of fuel to the sintering process also includes a metering belt scale, the discharge end of which is connected to the inlet of the trough.

[0016] Analysis reveals that this invention discloses a feeding device for secondary fuel addition to the sintering process. This feeding device evenly distributes fuel along the width of the trolley, ensuring a stable sintering process and preventing localized overmelting. The feeding device has a simple structure, flexible installation, low manufacturing and maintenance costs, and is easy to use. Through precise metering by a belt scale, full filling of the fuel trough by a screw conveyor, and the "volume method" of filling the grooves of the roller feeder combined with frequency conversion adjustment of the roller feeder's speed, uniform material distribution along the width of the trolley can be achieved. Using dry quenching coke as the secondary fuel added to the sintering process achieves precise compensation for the heat of the fuel on the surface of the sintered mixture, avoiding the problems of low strength and excessive powder due to underburning of the surface sinter. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention.

[0018] Figure 2 This is a top view of an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the left-side structure according to an embodiment of the present invention.

[0020] Figure 4 for Figure 3 An enlarged structural diagram of point A.

[0021] Explanation of reference numerals in the attached drawings: 1. Screw conveyor; 2. Roller feeder; 3. Chute; 4. Cart; 5. Feed inlet; 6. First bearing housing; 7. First reducer; 8. First motor; 9. Second bearing housing; 10. Second reducer; 11. Second motor; 12. Screw blade; 13. First section blade; 14. Second section blade; 15. Groove; 16. Dovetail groove; 17. Vertical plate. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0023] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] The accompanying drawings illustrate one or more examples of the invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0025] like Figures 1 to 4 As shown, according to an embodiment of the present invention, a feeding device for secondary fuel addition on the sintering surface is provided. The feeding device is disposed above the trolley 4 and is used to add fuel to the surface of the sintering mixture inside the trolley 4, such as... Figure 1 and Figure 2As shown, the feeding device includes a screw conveyor 1, a roller feeder 2, and a trough 3. The screw conveyor 1, roller feeder 2, and trough 3 are all horizontally positioned above the sintering trolley 4. The roller feeder 2 and trough 3 are arranged side-by-side, with the lower part of the screw conveyor 1 positioned inside the trough 3. One end of the trough 3 has a feed inlet 5. Fuel is added to the trough 3 through the feed inlet 5. The screw conveyor 1, by rotating, transports the fuel to the roller feeder 2, which, by rotating, evenly distributes the fuel onto the surface of the sintering mixture inside the sintering trolley 4. This feeding device can accurately and evenly distribute fuel onto the surface of the sintering mixture inside the sintering trolley 4, thereby optimizing the sintering process, achieving energy saving and consumption reduction, and improving sintering quality.

[0026] Furthermore, the fuel is fine coke powder produced during the dry quenching process, with a particle size of less than 5mm. As a byproduct of coking plants, fine coke powder is less than half the price of conventional fuels (coke powder, anthracite, etc.), offering significant economic benefits. Because the fuel is added to the surface of the sintering mixture, the utilization efficiency of the fine coke powder can reach 100%, solving the problem of 20% loss associated with traditional methods. Moreover, the fine particle size allows for rapid heat release during surface sintering, effectively and precisely replenishing the heat of the surface fuel in the sintering mixture, avoiding the problems of low strength and excessive powder production caused by under-burning of the surface sinter.

[0027] Furthermore, both ends of the rotating shaft of the screw conveyor 1 are supported by first bearing seats 6 to ensure the stability of the screw conveyor 1 during rotation. The first bearing seats 6 are mounted on the steel structure used to install the sintering machine head. The drive end of the rotating shaft of the screw conveyor 1 is connected to the first motor 8 through the first reducer 7, and the first motor 8 provides power for the operation of the screw conveyor 1; both ends of the rotating shaft of the roller feeder 2 are supported by second bearing seats 9, and the drive end of the rotating shaft of the roller feeder 2 is connected to the second motor 11 through the second reducer 10, and the second motor 11 provides power for the rotation of the roller feeder 2; the lengths of both the screw conveyor 1 and the roller feeder 2 are consistent with the width of the trolley 4. The first motor 8 and the second motor 11 are located on both sides of the trolley 4, which can avoid mutual interference between the first motor 8 and the second motor 11 during operation, and at the same time facilitate separate inspection and maintenance of the equipment.

[0028] Furthermore, such as Figure 3 As shown, the axis of the screw conveyor 1 and the axis of the roller feeder 2 are located in the same plane, and the axis of the screw conveyor 1 and the axis of the roller feeder 2 are parallel; the screw conveyor 1 and the roller feeder 2 rotate in the same direction.

[0029] Furthermore, the trough 3 is a top-opening trough structure with a semi-circular cross-section, and both ends of the trough 3 are sealed by side plates. A vertical plate 17 is connected to the upper end of the side of the trough 3 away from the roller feeder 2. The length of the vertical plate 17 is the same as the length of the trough 3. The vertical plate 17 can effectively prevent fuel splashing during the rotation of the screw conveyor 1, and at the same time protect the upper part of the screw conveyor 1. The trough 3 is in contact with the outer wall of the roller feeder 2, ensuring that all the fuel delivered by the screw conveyor 1 to the end of the trough 3 can enter the roller feeder 2.

[0030] Furthermore, a helical blade 12 is provided on the outer wall of the screw conveyor 1; one end of the trough 3 is close to the drive end of the rotating shaft of the screw conveyor 1. The helical blade 12 is composed of a first blade section 13 and a second blade section 14. The first blade section 13 is close to one end of the trough 3 and is a forward helix, while the second blade section 14 is a reverse helix. During the rotation of the screw conveyor 1, the first blade section 13 can move the fuel entering from the feed inlet 5 towards the middle of the trough 3 while simultaneously conveying fuel to the roller feeder 2. The second blade section 14 can reverse the flow of fuel that has moved to the end of the trough 3 and convey it to the middle of the trough 3, ensuring uniform fuel addition and avoiding localized empty or accumulated material.

[0031] Furthermore, the length ratio of the first blade 13 to the second blade 14 is 7:1. This configuration ensures feeding efficiency while precisely controlling the return flow of fuel at the end of the screw conveyor 1, ensuring uniform fuel addition.

[0032] Furthermore, such as Figure 4 As shown, the surface of the roller feeder 2 is evenly covered with several grooves 15. The axis of the grooves 15 is parallel to the axis of the roller feeder 2, and the length of the grooves 15 is the same as the length of the roller feeder 2. The cross-section of the inner wall of the groove 15 is a minor arc, and the chord length L corresponding to the minor arc is 8mm. The height H between the bottom of the groove 15 and the outer edge of the roller of the roller feeder 2 is 5mm. The screw conveyor 1 fills the grooves 15 with fuel by rotating, and the roller feeder 2 adds the fuel in the grooves 15 evenly to the surface of the sintered mixture in the trolley 4 by rotating. The amount of fuel added is adjusted by adjusting the rotation speed of the roller feeder 2. The groove 15 structure of the roller feeder 2 can achieve quantitative material feeding through the "volume method", and the amount of fuel spread can be precisely controlled by adjusting the rotation speed of the roller feeder 2.

[0033] Furthermore, the second bearing housing 9 is provided with a dovetail groove 16. When wear occurs between the material trough 3 and the groove 15 of the roller feeder 2, the distance between the roller feeder 2 and the material trough 3 can be adjusted through the dovetail groove 16. This allows for adjustment of the proximity between the roller body of the roller feeder 2 and the material trough 3, with a maximum adjustment distance of 3mm. The adjustable contact gap between the roller body of the roller feeder 2 and the material trough 3 ensures the stability of feeding and greatly extends the service life of the equipment.

[0034] Furthermore, it also includes a metering belt scale, the discharge end of which is connected to the inlet 5 of the material trough 3. The metering belt scale can accurately measure the fuel entering the material trough 3 to ensure the stability of the sintering process.

[0035] Furthermore, all equipment in contact with the fuel in this feeding device is made of stainless steel, which is corrosion-resistant and requires minimal maintenance.

[0036] The operation process of this feeding device is divided into: 1. Fine coke powder, a byproduct of coking plants, is used as a secondary sintering fuel. It is first accurately measured by a metering belt scale, and then transported into the trough 3 through the feed inlet 5. The metering belt scale can monitor the fuel delivery in real time and adjust it according to the sintering process requirements to ensure that the amount of fuel entering the trough is stable and controllable.

[0037] 2. The screw conveyor 1 starts to rotate under the drive of the first motor 8. The first section of blades 13 and the second section of blades 14 work together to push the fuel entering the trough towards the middle and the end of the fuel outlet, so as to avoid local material accumulation or gaps and ensure the stable fuel level in the trough.

[0038] 3. Fuel at the end of the feed trough 3 is pushed into the groove 15 of the roller feeder 2 by the screw conveyor 1. The roller feeder 2 rotates at a set speed driven by the second motor 11. As the roller feeder 2 rotates, the fuel in the groove 15 is carried downwards and evenly distributed on the surface of the sintering mixture inside the sintering trolley under the action of gravity. By adjusting the frequency of the second motor 11, the rotation speed of the roller feeder 2 can be changed, thereby achieving precise adjustment of the fuel distribution amount to meet the needs of different sintering conditions.

[0039] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: A feeding device for secondary fuel addition on the sintering surface is disclosed. This feeding device evenly distributes fuel along the width of the trolley 4, ensuring stable sintering and preventing localized overmelting. The feeding device has a simple structure, flexible installation, low manufacturing and maintenance costs, and is easy to use. The device uses a metering belt scale for precise feeding, a screw conveyor 1 to fully fill the fuel trough 3, and a roller feeder 2 with its groove 15 filled using a "volume method" combined with frequency conversion adjustment of the roller feeder 2's speed to achieve uniform material distribution along the width of the trolley 4. Utilizing fine coke powder as the secondary fuel added to the sintering surface achieves precise compensation for the heat of the fuel on the surface of the sintered mixture, avoiding the problems of low strength and excessive powder due to underburning of the surface sinter.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A feeding device for secondary fuel addition on the surface of sintering material in a sintering process, the feeding device being disposed above a trolley, the feeding device being used to add fuel to the surface of the sintering mixture within the trolley, characterized in that, This includes screw conveyors, roller feeders, and troughs, among which... The screw conveyor, the roller feeder, and the trough are all arranged horizontally above the trolley; The roller feeder and the trough are arranged side by side, the lower part of the screw conveyor is located in the trough, and a feed inlet is provided at one end of the trough; Fuel is added to the trough through the feed inlet, and the screw conveyor transports the fuel to the roller feeder by rotating. The roller feeder then evenly distributes the fuel onto the surface of the sintered mixture in the trolley by rotating.

2. The feeding device for secondary fuel addition in the sintering process according to claim 1, characterized in that, The fuel is fine coke powder, and the particle size of the fuel is less than 5 mm.

3. The feeding device for secondary fuel addition in the sintering process according to claim 1, characterized in that, The two ends of the rotating shaft of the screw conveyor are supported by the first bearing seats, and the drive end of the rotating shaft of the screw conveyor is connected to the first motor through the first reducer. The two ends of the rotating shaft of the roller feeder are supported by the second bearing seats respectively, and the drive end of the rotating shaft of the roller feeder is connected to the second motor through the second reducer; The lengths of the screw conveyor and the roller feeder are both the same as the width of the trolley; The first motor and the second motor are located on both sides of the trolley.

4. The feeding device for secondary fuel addition in the sintering process according to claim 1, characterized in that, The axis of the screw conveyor and the axis of the roller feeder are located in the same plane, and the axis of the screw conveyor and the axis of the roller feeder are parallel. The screw conveyor and the roller feeder rotate in the same direction.

5. The feeding device for secondary fuel addition in the sintering process according to claim 1, characterized in that, The trough is a top-opening trough structure with a semi-circular cross-section. Both ends of the trough are sealed by side plates. A vertical plate is connected to the upper end of the side of the trough away from the roller feeder, and the length of the vertical plate is the same as the length of the trough. The trough is in contact with the outer wall of the roller feeder.

6. The feeding device for secondary fuel addition in the sintering process according to claim 1, characterized in that, Helical blades are provided on the outer wall of the screw conveyor. One end of the trough is close to the drive end of the rotating shaft of the screw conveyor. The helical blades are composed of a first section of blades and a second section of blades. The first section of blades is close to one end of the trough. The first section of blades is a positive helix, and the second section of blades is a negative helix.

7. The feeding device for secondary fuel addition in the sintering process according to claim 6, characterized in that, The length ratio of the first blade segment to the second blade segment is 7:

1.

8. The feeding device for secondary fuel addition in the sintering process according to claim 1, characterized in that, The surface of the roller feeder is evenly covered with several grooves. The axis of the groove is parallel to the axis of the roller feeder. The length of the groove is the same as the length of the roller feeder. The cross-section of the inner wall of the groove is a minor arc. The chord length corresponding to the minor arc is 8mm. The height between the bottom of the groove and the outer edge of the roller of the roller feeder is 5mm. The amount of fuel added is adjusted by regulating the rotational speed of the roller feeder.

9. The feeding device for secondary fuel addition in the sintering process according to claim 3, characterized in that, The second bearing housing is provided with a dovetail groove, through which the distance between the roller feeder and the trough can be adjusted.

10. The feeding device for secondary fuel addition in the sintering process according to claim 1, characterized in that, It also includes a metering belt scale, the discharge end of which is connected to the inlet of the trough.

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