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Water distribution operation method for secondary cooling section of billet continuous casting machine

A billet continuous casting and operation method technology, applied in the field of metallurgy, can solve problems such as casting speed fluctuations, breakouts, billet cracks, etc., and achieve the effect of reducing quality loss

Active Publication Date: 2022-04-29
SHANDONG LAIGANG YONGFENG STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the steelmaking plant is in the stage of increasing production and stabilizing production, and there are often fluctuations in casting speed due to rhythm reasons. When the casting speed fluctuates, the water distribution of the secondary cooling cannot meet the demand for billet cooling under automatic conditions, which may easily cause breakouts, Production quality accidents such as slab cracks and slab segregation

Method used

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  • Water distribution operation method for secondary cooling section of billet continuous casting machine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, there are four types of billet cross-section design, in which the main cross-section is 165×165mm square billet cross-section, and 10 specific water volume curves are designed for each cross-section, and the ratios are from 1# curve, 2# curve, 3# curve, 4 #curve...10# curve, the current curves correspond to the following: 1# curve corresponds to 1.2 specific water volume, 2# curve corresponds to 1.4 specific water volume, 3# curve corresponds to 1.6 specific water volume, and the other 7 curves (4# curve...10 #curve) can be adjusted according to production needs.

[0033] Now take 1# curve 1.2 specific water volume as an example, adopt primary control, the specific values ​​of the primary control are as follows: foot roll section: when pulling speed<0.4 m / min, Q=0.5; pulling speed≥0.4m / min , <2.5 m / min, Q=K(1.39V+7.84) m3 / h; when the casting speed is ≥2.5m / min, Q=K(1.01V2-0.34V+5.87) m3 / h;

[0034] One stage of spraying: when the casting speed is le...

Embodiment 2

[0046] Install pressure transmitters, regulating valves and flowmeters on the secondary cooling branch pipes to detect the pressure, valve position and flow signals of each branch pipe, in which the signals are transmitted to the host computer through wired or wireless, and the signal data is transmitted through tables or images The form is displayed for easy viewing by the staff.

Embodiment 3

[0048] After the casting slab is pulled out from the copper tube of the crystallizer, it passes through the secondary cooling fan-shaped section. If the secondary cooling spray pipe and the bracket are fixed, the casting slab will deviate in the secondary cooling chamber, which will easily lead to uneven cooling of the casting slab, resulting in Appearance defects such as bulging and off-square; in this embodiment, by changing the connection mode between the spray pipe and the support in each area of ​​the second cold room to an adjustable connection, the centering and angle adjustment of the spray bar can be realized, and the casting billet can be cooled. More uniform; Wherein, the connection mode of the spray pipe and the bracket is bolt connection, and the position of the spray pipe can be adjusted by adjusting the screwing depth of the bolt.

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Abstract

The invention discloses a water distribution operation method for a secondary cooling section of a small square billet continuous casting machine, which comprises the following steps of: controlling the water quantity, the pulling speed, the superheat degree and the temperature of the secondary cooling section, and obtaining the solidification change condition of a casting blank; pressure, valve position and flow signals of a secondary cooling water branch are obtained, and pressure, valve position and flow signals of spraying of a third cooling chamber are obtained and displayed on the upper computer; judging the working state of a nozzle according to the relationship between the pressure and the flow of each flow of secondary cooling water in each area of the secondary cooling water continuous casting machine; setting a plurality of specific water flow curves according to the section size of the square billet, and controlling and adjusting the specific water flow according to the specific water flow curves. By changing the secondary cooling section water distribution method, the possible situations of nozzle blockage, water leakage, nozzle installation errors and the like are found in time through nozzle blockage alarm, the quality loss caused by nozzle blockage is reduced, the nozzles of the secondary cooling section, the atomization effect, the spraying angle and the water distribution amount all reach the optimal state, and the service life of the secondary cooling section is prolonged. And quality accidents such as casting blank separation, casting blank segregation and casting blank cracks are avoided.

Description

technical field [0001] The invention relates to the technical field of metallurgy, and more specifically relates to a method for distributing water in the secondary cooling section of a billet continuous casting machine. Background technique [0002] With the increasing demand for steel in today's market, iron and steel enterprises have higher and higher demands for high and stable production brought about by the stability of production quality and production continuity of continuous casting machines. The quality of the billet of the casting machine ensures the production stability of the continuous casting machine, improves the water distribution of the secondary cooling section, the spray angle and atomization effect of the secondary cooling section, and realizes the development trend of improving the quality of the billet, high production and stable production. At present, the steelmaking plant is in the stage of increasing production and stabilizing production, and there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/22B22D11/124B22D2/00
CPCB22D11/225B22D11/124B22D11/1246B22D2/00
Inventor 王福海苏庆林赵恒檀伟峰李文明
Owner SHANDONG LAIGANG YONGFENG STEEL & IRON
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