Catchment Pit Drainage Module for Molten Metal Spills
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Solution Overview
Problem
Existing catchment pits in smelting plants face challenges in efficiently draining large quantities of water following a spill, leading to potential flooding and increased risk of steam explosions due to the low permeability of cupola slag and undersized drainage openings.
Innovation Solution
The catchment pit design incorporates a drainage module with a refractory, water-permeable side wall and a pump system that evacuates water from the pit, significantly increasing the water entry area and flow rate compared to traditional designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cupola slag is used as drainage material, then water permeability is improved, but drainage capacity deteriorates due to sintering and low permeability
Solution Approach 1:
The drainage system is divided into multiple independent drainage openings distributed across the floor, each capable of draining water independently. This segmentation allows the system to maintain high drainage capacity even if individual openings become blocked or sintered, resolving the contradiction between reliability and productivity.
Solution Approach 2:
Different regions of the drainage system use different materials and designs: the floor uses cupola slag for water permeability, while the drainage openings are specifically designed with larger dimensions and alternative materials to prevent sintering. This local differentiation allows each component to optimize its function, resolving the contradiction between water permeability and drainage capacity.
2Productivity
If drainage opening size is increased, then drainage capacity is improved, but protection against solids entry deteriorates
Solution Approach 1:
The drainage openings are designed with locally differentiated properties: they are large enough to drain water quickly but incorporate specific geometric features and positioning that prevent solid particles from entering. The openings are strategically located and shaped to allow water flow while blocking solids, resolving the contradiction between drainage capacity and solids protection.
Solution Approach 2:
A granular bulk material layer is introduced as an intermediary between the drainage openings and the chamber interior. This layer acts as a filter that allows water to pass through to the drainage openings while preventing solid particles from entering the drainage system, thus resolving the contradiction between drainage capacity and solids contamination.
3Productivity
If multiple drainage openings are provided, then drainage capacity is improved, but structural complexity increases
Solution Approach 1:
The drainage system is segmented into multiple simple, identical drainage openings distributed across the floor. Each opening has a simple design that can be easily constructed and maintained. This segmentation approach increases drainage capacity through parallel flow paths while keeping individual components simple, resolving the contradiction between productivity and device complexity.
4Object-affected harmful factors
If water drainage openings are made small to prevent solids entry, then solids protection is improved, but water drainage capacity deteriorates
Solution Approach 1:
A granular bulk material layer is introduced as an intermediary filtering medium between the chamber interior and the drainage openings. This layer allows water to pass through freely while blocking solid particles, enabling the drainage openings to be designed for maximum water capacity without concern for solids entry, thus resolving the contradiction between solids protection and water drainage capacity.
Solution Approach 2:
The drainage function is segmented into two independent components: the granular bulk material layer that handles solids filtration, and the drainage openings that handle water discharge. This segmentation allows each component to be optimized for its specific function, with the drainage openings designed for maximum water capacity and the granular layer providing solids protection, resolving the contradiction between solids contamination and water drainage capacity.
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
This design enables rapid and complete drainage of water from the catchment pit, reducing the risk of flooding and steam explosions, while also providing a cost-effective solution by utilizing readily available materials like gravel.
Implementation Method 1
chambers being provided for receiving the molten metal. These chambers are bounded by a floor and side walls that in at least the lower regions of the walls and the floor are formed by a base element made of refractory, water-permeable material
Implementation Method 2
Cupola slag is very porous and therefore conducts water and water vapor well into the screen gravel layer
Implementation Method 3
cupola furnace slag sinters immediately when it comes into contact with molten metal, making it impermeable and preventing the molten metal from penetrating into the sieve gravel layer
Implementation Method 4
A pump connected to the drainage conduit can thus evacuate water from the recess
Data Source
AI summary
A catchment pit for molten metal and cooling water. has a floor formed with a recess and upwardly open chambers in the pit for receiving the molten metal and supported on the floor. Portions of the side walls of the chambers adjacent respective floors of the chambers and these floors are made of refractory and water-permeable material. A drainage module extends in the pit down into the recess and has a refractory water-permeable side wall so that water in the chambers can pass down into the recess. Granular bulk material fills the pit around and under the chambers and drainage module. A drainage conduit extending down in the drainage module to an intake end in the recess below the chambers. A pump connected to the drainage conduit can thus evacuate water from the recess.