A secondary screening device for finished lime warehouse

Abstract

This utility model relates to a secondary screening device for finished lime silos, belonging to the field of lime calcination technology. It includes a block silo, a secondary vibrating screen below the silo outlet, a secondary ash hopper inside the secondary vibrating screen, and a screw feeder below the secondary ash hopper. The outlet of the screw feeder is connected to a bucket elevator via a chute. The ash blocks in the block silo fall onto the secondary vibrating screen, undergoing secondary screening to form secondary block ash and secondary powder ash. The secondary block ash falls into a transport vehicle, while the secondary powder ash falls into the secondary ash hopper, and then, via the screw feeder and chute, enters the bucket elevator again before returning to the finished product vibrating screen. This application is easy to operate; the secondary screening of the ash blocks in the block silo during loading reduces the powder content in the ash blocks, improves the quality of the ash blocks, and meets the requirements of steelmaking for metallurgical ash blocks.

Description

Technical Field

[0001] This utility model relates to a secondary screening device for finished lime storage, belonging to the field of lime calcination technology. Background Technology

[0002] The high powder content in lime lumps leads to dust being absorbed by the dust removal system during lime addition, resulting in underburning, which affects smelting time and increases actual consumption. The increased powder content in the lime lumps is mainly due to the high-temperature lime lumps absorbing moisture from the air inside the silo and reacting to form powder. The increased underburning rate is mainly due to the calcination characteristics of the rotary kiln, where small particles have poor tumbling properties and uneven heating. To meet the needs of steelmaking production, there is an urgent need for a secondary screening device for finished lime silos that can improve the quality of lime lumps and reduce the powder content and underburning rate. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a secondary screening device for finished lime silos, which is easy to operate, reduces the powder content in the lime blocks, and improves the quality of the lime blocks.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: a finished product silo lime secondary screening device, including a block silo, a secondary vibrating screen is provided below the outlet of the block silo, a secondary ash hopper is provided inside the secondary vibrating screen, a screw feeder is provided below the secondary ash hopper, and the outlet of the screw feeder is connected to a bucket elevator through a chute; the block ash in the block silo falls onto the secondary vibrating screen, and the block ash is screened twice to form secondary block ash and secondary powder ash. The secondary block ash falls into a transport vehicle, and the secondary powder ash falls into the secondary ash hopper, and then enters the bucket elevator through the screw feeder and chute, and then returns to the finished product vibrating screen.

[0005] The chute is arranged at a downward angle of 45°.

[0006] The screen plate gap of the secondary vibrating screen is 10-15mm.

[0007] The block bin outlet is connected to the block bin discharge pipe, and the outlet of the block bin discharge pipe faces the secondary vibrating screen; the block bin discharge pipe is equipped with a discharge valve, which controls the opening and closing of the block bin discharge pipe.

[0008] The secondary ash hopper is equipped with two level gauges: a high level gauge and a low level gauge. The high level gauge is located above the low level gauge. The discharge valve, screw feeder, high level gauge, and low level gauge are respectively connected to the PLC controller signal.

[0009] Compared with the prior art, the advantages of this utility model are: a secondary screening device for finished lime silos is easy to operate. It performs secondary screening of the lime blocks in the silo during loading, which reduces the powder content in the lime blocks, improves the quality of the lime blocks, and meets the requirements of steelmaking for metallurgical lime blocks. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a secondary screening device for finished lime in a finished product warehouse, according to an embodiment of the present invention.

[0011] In the diagram: 1. Powder silo; 2. Finished product vibrating screen; 3. Ash conveyor; 4. Silo; 5. Discharge valve; 6. Secondary vibrating screen; 7. Level gauge; 8. Screw feeder; 9. Chute; 10. Bucket elevator. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0013] like Figure 1 As shown in this embodiment, a secondary screening device for finished lime silos includes a block silo 4 containing block lime. The block lime is screened by a finished product vibrating screen 2 and then conveyed to the block silo 4 by a block lime conveyor 3. A secondary vibrating screen 6 is located below the outlet of the block silo 4, and a secondary ash hopper is located inside the secondary vibrating screen 6. The screen plate of the secondary vibrating screen 6 has a gap of 10mm. Particles and dust smaller than 10mm enter the secondary ash hopper and are classified as secondary ash. The block lime larger than 10mm remaining on the screen plate is vibrated by the secondary vibrating screen and sent to the transport vehicle, reducing the powder content in the loaded block lime. The secondary ash in the secondary ash hopper is conveyed to a chute 9 by a screw feeder 8, and then enters a bucket elevator 10 before returning to the finished product vibrating screen. The finished product vibrating screen conveys the secondary ash to the powder silo 1.

[0014] The aforementioned chute is arranged at a downward angle of 45°.

[0015] The outlet of the aforementioned block silo is connected to the block silo discharge pipe, and the outlet of the block silo discharge pipe faces the secondary vibrating screen. A discharge valve 5 is installed on the block silo discharge pipe, which controls the opening and closing of the block silo discharge pipe. When the transport vehicle arrives at the block ash loading position, the discharge valve is opened, allowing the block ash in the block silo to enter the secondary vibrating screen through the block ash discharge pipe. The secondary vibrating screen separates the block silo into secondary block ash and secondary powder ash smaller than 10mm. The secondary block ash is vibrated into the transport vehicle, and the secondary powder ash enters the secondary ash hopper. This achieves further screening of the block ash in the block silo, enabling dust recovery from the block ash, reducing the block ash powder rate, and meeting the requirements of steelmaking for metallurgical block ash.

[0016] The aforementioned secondary ash hopper is equipped with two level gauges 7: a high level gauge and a low level gauge. The high level gauge is located above the low level gauge. The high level gauge and the low level gauge are used to detect the height of the secondary powder ash in the hopper. The discharge valve, screw feeder, high level gauge, and low level gauge are respectively connected to the PLC controller. The detection data from the high level gauge and the low level gauge are fed back to the PLC controller, thereby controlling the start and stop of the discharge valve and the screw feeder.

[0017] This application is easy to operate. During loading, the ash block in the silo is screened twice, which reduces the powder content in the ash block, improves the quality of the ash block, and meets the requirements of steelmaking for metallurgical ash block.

[0018] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A finished product store lime secondary screening device, characterized by: The system includes a block silo, a secondary vibrating screen located below the silo outlet, a secondary ash hopper located inside the secondary vibrating screen, and a screw feeder located below the secondary ash hopper. The outlet of the screw feeder is connected to a bucket elevator via a chute. The block ash in the block silo falls onto the secondary vibrating screen, where it undergoes secondary screening to form secondary block ash and secondary powder ash. The secondary block ash falls into a transport vehicle, while the secondary powder ash falls into the secondary ash hopper. After passing through the screw feeder and chute, the powder ash enters the bucket elevator and returns to the finished product vibrating screen.

2. The finished product store lime secondary screening device according to claim 1, characterized in that: The chute is arranged at a downward angle of 45°.

3. The lime secondary screening device for finished product store according to claim 1, characterized in that: The screen plate gap of the secondary vibrating screen is 10-15mm.

4. The finished product store lime secondary screening device according to claim 1, characterized in that: The block bin outlet is connected to the block bin discharge pipe, and the outlet of the block bin discharge pipe faces the secondary vibrating screen; the block bin discharge pipe is equipped with a discharge valve, which controls the opening and closing of the block bin discharge pipe.

5. The finished product store lime secondary screening device according to claim 4, characterized in that: The secondary ash hopper is equipped with two level gauges: a high level gauge and a low level gauge. The high level gauge is located above the low level gauge. The discharge valve, screw feeder, high level gauge, and low level gauge are respectively connected to the PLC controller signal.

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