Shallow Scale Pit Layout for Selective Steel Mill Water Separation
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Solution Overview
Problem
Existing steel product processing plants require deep scale pits for separating mixtures of water and scale, incurring high civil works costs and maintenance, and the current separation systems are not selective, necessitating multiple steps to separate water and scale effectively.
Innovation Solution
A steel product processing plant with a separation system that divides the collection of mixtures into two or more collection pits, each with a depth less than 10 meters, equipped with a dredging device like a scraping conveyor, to separate large and fine scale efficiently, reducing overall depth and construction costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single deep scale pit is used to collect and separate water and scale mixtures, then the separation function is provided, but the civil works costs and construction complexity increase significantly
Solution Approach 1:
The single deep scale pit is divided into multiple separate collection pits, each with a depth less than 10 meters. Each pit is equipped with its own dredging device, allowing independent operation and maintenance. This segmentation reduces the overall construction complexity and civil works costs while maintaining the scale separation function.
2Reliability
If a single deep scale pit is used for scale separation, then the separation process is provided, but the maintenance complexity and costs increase
Solution Approach 1:
By dividing the system into multiple independent collection pits, each with its own dredging device, the maintenance of one pit does not affect the operation of others. This allows for easier and less costly maintenance, as only the affected pit needs to be taken offline for servicing.
3Reliability
If a single deep scale pit is used, then scale separation is achieved, but the construction time and investment costs increase
Solution Approach 1:
Multiple shallower pits can be constructed in parallel rather than sequentially, significantly reducing the overall construction time. The reduced depth of each pit (less than 10 meters) also simplifies excavation and construction activities compared to a single very deep pit.
4Reliability
If the current non-selective separation system is used, then scale removal is provided, but multiple separation steps are necessary
Solution Approach 1:
Each collection pit is equipped with a dredging device that can selectively remove scale from the water mixture. This local capability for selective separation eliminates the need for multiple sequential separation steps, as each pit can independently perform the separation function with high efficiency.
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 system reduces civil works costs, maintenance complexity, and increases processable flow rates, achieving efficient separation of scale from water while minimizing construction time and energy consumption.
Implementation Method 1
the subsequent process of separation from the water of the coarse, heavy scale by decanting or sedimentation by gravity
Implementation Method 2
a mechanical scraping conveyor, in which two chains, guided by relative rollers of which at least one is motorized, run in relative circuits
Data Source
AI summary
The invention relates to a steel product processing plant, in particular including a rolling line and preferably upstream thereof a continuous casting line including at least one steel product direct cooling or cleaning system, or another system suitable to spray water on the product being processed; and a system for the separation of mixtures, in particular of a muddy nature, including water and scale deriving from said systems, which is provided with at least two pits (F1, F2) for collecting the mixtures, wherein at least a first pit (F1), advantageously provided with a dredging system for continuously removing the scale, is fed by water with coarse scale and at least a second pit (F2) with water with fine scale and wherein said pits each have a maximum overall depth <10 m, preferably even less.