Continuous Casting Stopper Gas Backpressure Control
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Solution Overview
Problem
Existing stoppers for continuous casting face challenges in precisely controlling gas backpressure and flow rate due to variations in casting speed and steel type, leading to instability and quality issues in steel production.
Innovation Solution
Incorporating a pressure control component made of dense refractory with specific through holes or slits in the stopper, positioned above the gas discharge hole, to regulate gas pressure and flow rate accurately, ensuring stable gas discharge into molten steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas discharge amount is controlled to a small amount, then the gas discharge port can be maintained in a gas pressure applied state, but the gas pressure around the gas discharge portion cannot be grasped or controlled
Solution Approach 1:
A pressure control component is introduced as an intermediary element between the gas supply and the gas discharge hole. This component includes a through hole that allows gas to pass through while enabling pressure control and measurement at the discharge portion, solving the problem of inability to grasp or control backpressure when gas discharge amount is small
2Quantity of substance
If the gas discharge amount is increased to control quality, then the flow rate can be adjusted, but the backpressure control precision deteriorates
Solution Approach 1:
The stopper is segmented into functional regions: an upper portion for gas supply and a lower pressure control component with through holes for gas discharge. This segmentation allows independent control of gas flow rate and backpressure, enabling precise adjustment of gas discharge amount while maintaining backpressure control precision
3Quantity of substance
If the number of through holes is increased to achieve required gas discharge amount, then the gas discharge capacity is improved, but the backpressure control becomes more difficult
Solution Approach 1:
The pressure control component features local quality differentiation with specifically designed through holes having controlled diameter and distribution. This allows the system to achieve required gas discharge capacity through optimized hole configuration rather than simply increasing hole count, thereby maintaining backpressure control simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise control of gas backpressure and flow rate, preventing nozzle clogging, improving steel quality by stabilizing gas distribution and reducing inclusion floatation, thus enhancing the overall casting process.
Implementation Method 1
a pressure control component in a part of the reduced-diameter region, the part being above the gas discharge hole within the cavity
Implementation Method 2
the pressure control component is made of a dense refractory having no gas permeability under a condition of pressurizing a sample of the refractory having a length of 20 mm at 8×10−2 MPa
Implementation Method 3
a gas blowing function for the purpose of floating inclusions in molten steel
Data Source
AI summary
The precision of grasping or controlling backpressure around a gas discharge portion in a stopper for continuous casting can be improved with a stopper for continuous casting which includes a cavity for conveying gas in a vertical direction center of the stopper, one or a plurality of gas discharge holes passing through from the cavity to the outside in a distal center or a side surface of a reduced-diameter region including a fitted portion to a lower nozzle, and a pressure control component in a part of an area above the gas discharge hole within the cavity.