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Judgment method of the state of the secondary cooling system of continuous casting

A cooling system and state technology, which is applied in the field of judging the state of the secondary cooling system of continuous casting, can solve problems such as inability to achieve, and achieve the effects of improving production efficiency, convenient use and improving cooling effect.

Active Publication Date: 2021-04-13
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is also difficult to achieve under actual working conditions. Not only does it need to arrange a large number of temperature detection devices, but also it cannot be realized on the outer arc surface of the casting machine.

Method used

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  • Judgment method of the state of the secondary cooling system of continuous casting

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Comparison scheme
Effect test

Embodiment 1

[0053] An enterprise uses 1# continuous casting machine, the inner arc of zone 5 of the secondary cooling system, the pressure of the secondary cooling air is 0.15MPa, and the flow rate of the secondary cooling water is 180L / min, the valve opening of the secondary cooling air measured by this circuit is 60%. After a certain period of production, under the same secondary cooling air pressure and secondary cooling water flow conditions, the opening of the pressure regulating valve 1-1 of this circuit is displayed as 10%, and the system sends out a serious blockage signal. Inspection found that up to 40% of the nozzles were clogged, and after replacement, the opening of the circuit pressure regulating valve 1-1 returned to 60% under the same conditions.

Embodiment 2

[0055] A certain enterprise uses 1# continuous casting machine, the outer arc of zone 7 of the secondary cooling system, when the pressure of the secondary cooling air is 0.15MPa, and the flow rate of the secondary cooling water is 120L / min, the opening of the valve of the secondary cooling air measured by this circuit is 55%. After a certain period of production, under the same secondary cooling air pressure and secondary cooling water flow conditions, the opening of the pressure regulating valve 1-1 of this circuit is displayed as 78%, and the system sends out a moderate leakage signal, and the secondary cooling system of the circuit is shut down. After the inspection, it was found that the secondary cold air pipe was ruptured and caused air leakage. After the air pipe was replaced, the opening of the pressure regulating valve 1-1 of the circuit returned to about 55% under the same conditions.

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Abstract

The invention discloses a method for judging the state of a continuous casting secondary cooling system, comprising step 1: confirming that the water supply and air supply pressure of the secondary cooling system are stable; step 2: confirming that the nozzle (4) is not blocked and the pipeline has no leakage; step 3: Calibrate the opening of the electromagnetic flowmeter (2‑1) and the pressure regulating valve (1‑1) at 0 position; Step 4: Set the common pressure of the process by the secondary cooling air pressure, turn on the secondary cooling water, and the flow rate is from the minimum flow rate of the process to the maximum flow value; Step 5: Divide the secondary cold water flow into multiple flow nodes, and record the opening of the pressure regulating valve after stabilization; Step 6: Repeat steps 4 and 5 2-3 times, and take the average value of the opening of the pressure regulating valve as a control value; Step 7: The flow rate of the secondary cooling water in the secondary cooling air-water cooling circuit reaches the flow node and is stable. If the opening of the pressure regulating valve is smaller than the control value, a blockage signal is output, and if it is greater than the control value, a leakage signal is output. The invention can quickly judge the abnormality of a certain secondary cooling circuit by using the valve opening signal of the secondary cooling system.

Description

technical field [0001] The invention relates to a secondary cooling system of continuous casting steel, in particular to a method for judging the state of the secondary cooling system of continuous casting. Background technique [0002] In continuous casting production, molten steel passes through the crystallizer to form a primary slab shell containing a liquid core, and then it is completely solidified into a slab after continued cooling in the secondary cooling area. The secondary cooling area is the key position where molten steel is cooled and solidified from liquid to solid state. The secondary cooling generally uses a steam-water mixing nozzle to atomize water and spray it onto the surface of the slab. The uniformity of cooling in the secondary cooling area has a great impact on the surface and internal quality of the slab. have a decisive impact. Due to the blockage of the secondary cooling nozzle or the leakage of the pipeline, the cooling is uneven, and the overco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/22
CPCB22D11/225
Inventor 吴杰赵显久
Owner BAOSHAN IRON & STEEL CO LTD
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