Desulfurization slag conglomeration agent feeding device

Abstract

The utility model discloses a desulfuration slag conglomeration agent feeding device which comprises a discharging bin, a hopper bin is arranged on the upper portion of the discharging bin, a weight sensor is arranged between the hopper bin and the discharging bin, an outlet of the discharging bin is connected with an inlet of a spiral feeder, an outlet of the spiral feeder is connected with a ladle, and the discharging bin is connected with a slag conglomeration agent. And the screw feeder is provided with a driving motor. The slag conglomeration agent can be added according to the actual distribution amount of slag on the surface of molten iron, and the adding amount is automatically controlled more conveniently; according to the method, the initial commissioning and dynamic supplementary commissioning mechanism of the slag conglomeration agent can be accurately controlled, high efficiency and standardization of the slagging-off process are achieved, unnecessary consumption of the slag conglomeration agent is reduced, the process stability of the molten iron pretreatment stage is ensured, and it is guaranteed that high-quality molten iron components are provided for the subsequent steelmaking process.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical technology, specifically relating to a desulfurization slag-forming agent feeding device. Background Technology

[0002] After desulfurization at the KR desulfurization station, the molten iron ladle needs to be tilted to between 30° and 45° before a slag remover is used to remove slag from its surface. Only after this process can the molten iron proceed to the next stage; otherwise, the sulfur content in the molten iron will severely affect the converter's element control. During slag removal, a certain amount of slag-aggregating agent needs to be added to the ladle to gather the slag dispersed on the surface, facilitating subsequent deeper slag removal. Previously, the slag-aggregating agent was manually added to the ladle in 2.5kg packets. This manual addition method resulted in inconsistent dosage control, failing to consider the actual slag distribution on the molten iron surface and wasting slag-aggregating agent costs. Therefore, a new slag-aggregating agent addition device needs to be developed. Utility Model Content

[0003] Technical problem solved: To address the above-mentioned technical problem, this utility model provides a desulfurization slag-forming agent feeding device, which can add slag-forming agent according to the actual slag distribution on the molten iron surface, and the addition amount is more convenient with automated control.

[0004] Technical solution: A desulfurization slag additive feeding device includes a feeding bin, an upper part of which is provided with a hopper bin, a weight sensor is provided between the hopper bin and the feeding bin, the outlet of the feeding bin is connected to the inlet of a screw feeder, the outlet of the screw feeder is connected to a ladle of molten iron, and the screw feeder is provided with a drive motor.

[0005] Preferably, the upper part of the hopper is provided with a grid plate, and the grid plate is provided with a top cone.

[0006] Preferably, the edge of the hopper is provided with a side baffle.

[0007] Preferably, the outlet of the screw feeder is connected to the molten iron ladle via a pipe, the pipe including a discharge pipe and a chute connected in sequence, the discharge pipe being connected to the outlet of the screw feeder, and the chute being connected to the molten iron ladle.

[0008] Furthermore, the included angle between the feed pipe and the chute is 135°.

[0009] Furthermore, a dust removal hood is provided on the upper part of the molten iron ladle, and the chute extends through the dust removal hood into the interior of the molten iron ladle.

[0010] Furthermore, the feeding pipe is equipped with two pneumatic butterfly valves.

[0011] Furthermore, the two pneumatic butterfly valves, drive motors, and weight sensors are all connected to the PLC controller.

[0012] Beneficial Effects: This utility model discloses a desulfurization slag-forming agent feeding device, which can add slag-forming agent according to the actual slag distribution on the molten iron surface, and the automated control of the addition amount is more convenient. This utility model device can precisely control the initial operation and dynamic replenishment mechanism of the slag-forming agent, realizing the high efficiency and standardization of the slag removal process. This reduces unnecessary consumption of slag-forming agent, ensures the process stability of the molten iron pretreatment stage, and guarantees the provision of high-quality molten iron components for subsequent steelmaking processes. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a desulfurization slag-forming agent feeding device according to the present invention;

[0014] Figure 2 This is a three-dimensional structural diagram of a desulfurization slag-forming agent feeding device according to this utility model;

[0015] Figure 3 This is a top view of the filter screen in a desulfurization slag-forming agent feeding device of this utility model;

[0016] Figure 4 This is a schematic diagram of the installation position of a desulfurization slag-forming agent feeding device according to this utility model;

[0017] The following items are listed in the diagram: 1. Side baffle, 2. Screw feeder, 3. Drive motor, 4. Feeding bin, 5. Weight sensor, 6. Hopper, 7. Mesh plate, 8. Top cone, 9. Feeding pipe, 10. Chute, 11. Pneumatic butterfly valve, 12. Dust collector hood, 13. Upper cable tray. Detailed Implementation

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings. Example

[0019] Reference Figure 1-4 A desulfurization slag-forming agent feeding device is installed on the upper bridge frame 13 of a slag remover. It includes a feeding bin 4, with a hopper 6 located above the feeding bin 4. The hopper 6 is made of 10 mm checkered plate and has a volume of 2 m³. 3 The hopper 6 is equipped with a stepping screw conveyor. A weight sensor 5 is installed between the hopper 6 and the discharge bin 4. The outlet of the discharge bin 4 is connected to the inlet of the screw feeder 2. The outlet of the screw feeder 2 is connected to the ladle of molten iron. The screw feeder 2 is equipped with a drive motor 3.

[0020] The upper part of the aforementioned hopper 6 is provided with a grid plate 7, and the grid plate 7 is provided with a top cone 8.

[0021] The edge of the aforementioned hopper 6 is provided with a side baffle 1.

[0022] The outlet of the aforementioned screw feeder 2 is connected to the molten iron ladle via a pipe. The pipe includes a feed pipe 9 and a chute 10 welded sequentially. The feed pipe 9 is connected to the outlet of the screw feeder 2, and the chute 10 is connected to the molten iron ladle. The included angle α between the feed pipe 9 and the chute 10 is 135°. Two pneumatic butterfly valves 11 are installed on the feed pipe 9. The two DN150 pneumatic butterfly valves 11, the drive motor 3, and the weight sensor 5 are all connected to the PLC controller to add a human-machine interface. Three modes are designed: deep slag removal mode, shallow slag removal mode, and common mode. These three modes are selected through the operation screen according to the actual requirements for slag removal of molten iron. The slag-aggregating dosage used in each mode is 350kg, 150kg, and 250kg, respectively. The amount of slag-aggregating agent added in each mode can be adjusted according to actual use.

[0023] In the KRT desulfurization process, adding slag-forming agent to the surface of molten iron is a key operation to optimize slag removal efficiency. The slag-forming agent changes the material flow characteristics of the slag layer, causing the dispersed slag on the surface of the molten iron to quickly aggregate into dense blocks, forming an integral structure that is easy to remove. This significantly shortens the slag removal time and improves the purity of the molten iron. In specific operation, the addition parameters of the slag-forming agent need to be set according to the initial distribution state of the slag on the surface of the molten iron. When the slag layer is uniform and slightly dispersed, take 115 tons of molten iron as an example and add 150 kg of slag-forming agent initially. If the slag is widely distributed, uneven in thickness, or has obvious discrete distribution, the initial addition amount should be adjusted to 200 kg to ensure that the slag-forming agent fully contacts and reacts with the slag layer.

[0024] During slag removal, if scattered slag lumps and thin slag layers are found on the surface of the molten iron, a dynamic replenishment strategy should be adopted, adding 50 kg each time, with the interval between additions allowing the slag agglomerating agent to fully spread and promote slag disintegration (usually no more than 2 minutes). The replenishment operation should continue until the slag completely aggregates into large lumps and the molten iron analysis is clear, to avoid secondary contamination of the molten iron due to slag residue or abnormal elemental composition in subsequent processes.

[0025] The above-mentioned molten iron ladle is provided with a dust removal hood 12, and the chute 10 extends through the dust removal hood 12 into the interior of the molten iron ladle.

[0026] Since a large amount of dust is generated during desulfurization, two pneumatic butterfly valves 11 are added to prevent dust from overflowing through the chute 10 under the dust collector 12 and causing smoke and dust to spill out. This also serves as protection for the drive motor 3.

[0027] In operation, a crane lifts the bagged slag-forming agent to the top of the hopper 6 and slowly lowers it, causing the bottom of the bag to press against the top cone 8. Gravity breaks the bag, allowing the slag-forming agent to flow into the hopper 6. The weight sensor 5 displays the weight of the slag-forming agent in the hopper 6 in real time on the control screen. After the molten iron ladle has been desulfurized, the weight button for adding slag-forming agent is selected on the PLC controller. This opens two pneumatic butterfly valves 11, starts the drive motor 3, and controls the screw feeder 2 to feed the agent. Simultaneously, the weight in the hopper 6 is displayed. When the set weight minus the actual amount added is greater than the deceleration weight, the PLC controller issues a deceleration command, and the frequency converter controls the drive motor 3 to rotate slowly, thus controlling the screw feeder 2 to feed slowly. When the added weight plus the drop is greater than the set weight, the PLC controller sends a stop command to the frequency converter, ending the feeding process. Five seconds after the feeding ends, the weight recorded when the hopper 6 starts minus the weight five seconds after the feeding ends is the actual weight of the slag-forming agent added. Among them, the drop is the change value of the weight sensor 5 from dynamic feeding to precise and stable feeding during the feeding process; the deceleration weight is the set value of the screw feeder 2 from fast feeding to slow feeding in order to improve the feeding accuracy.

[0028] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A desulfurization slag-forming agent feeding device, characterized in that: It includes a feeding bin (4), a hopper bin (6) is provided on the upper part of the feeding bin (4), a weight sensor (5) is provided between the hopper bin (6) and the feeding bin (4), the outlet of the feeding bin (4) is connected to the inlet of the screw feeder (2), the outlet of the screw feeder (2) is connected to the molten iron ladle, and the screw feeder (2) is provided with a drive motor (3).

2. A desulfurization poly-slag agent feeding device according to claim 1, characterized in that: The upper part of the hopper (6) is provided with a grid plate (7), and the grid plate (7) is provided with a top cone (8).

3. A desulfurizing poly-coke additive feeding device according to claim 1, characterized in that: The edge of the hopper (6) is provided with a side baffle (1).

4. A desulfurizing poly-coke additive feeding device according to claim 1, characterized in that: The outlet of the screw feeder (2) is connected to the molten iron ladle through a pipe. The pipe includes a feeding pipe (9) and a chute (10) connected in sequence. The feeding pipe (9) is connected to the outlet of the screw feeder (2), and the chute (10) is connected to the molten iron ladle.

5. A desulfurizing poly-coke additive feeding device according to claim 4, characterized in that: The included angle between the feed pipe (9) and the chute (10) is 135°.

6. A desulfurizing poly-coke additive feeding device according to claim 4, characterized in that: The ladle is provided with a dust removal hood (12) on the upper part, and the chute (10) extends through the dust removal hood (12) into the ladle.

7. A desulfurization poly-slag agent feeding device according to claim 4, characterized in that: Two pneumatic butterfly valves (11) are installed on the feeding pipe (9).

8. The desulfurization slag additive feeding device according to claim 7, characterized in that: Two pneumatic butterfly valves (11), a drive motor (3) and a weight sensor (5) are all connected to the PLC controller.

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