Lance Nozzle with Fluid Wall Throat for Oxygen Flow Control
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Solution Overview
Problem
Existing methods for oxygen-blowing refining of molten iron require multiple lance nozzles for different carbon concentration regions, leading to operational interruptions, increased space requirements, and complex nozzle structures with movable parts that suffer from friction and wear issues.
Innovation Solution
A lance nozzle design featuring blowing holes on the inner wall at the minimum cross-sectional area or nearby, allowing for adjustment of the apparent throat diameter by feeding a working gas to control oxygen flow and velocity independently, eliminating the need for multiple nozzles and movable parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lance nozzles are used for different carbon concentration regions, then adequate expansion conditions for both high and low carbon concentration regions can be achieved, but operational interruptions occur during nozzle switching and space requirements increase
Solution Approach 1:
The invention applies dynamics by making the nozzle throat area adjustable through a movable partition wall that can change the effective throat diameter. This allows a single nozzle to adapt between high carbon concentration region (smaller throat area) and low carbon concentration region (larger throat area) conditions, eliminating the need for multiple nozzles and operational interruptions during switching.
Solution Approach 2:
The invention implements universality by designing a single lance nozzle that can serve multiple functions - handling both high carbon concentration and low carbon concentration refining operations. The adjustable partition wall enables one nozzle to provide adequate expansion conditions for different carbon concentrations, replacing the need for multiple specialized nozzles.
2Adaptability or versatility
If multiple lance nozzles are kept on standby, then adequate expansion conditions for different carbon concentration regions can be provided, but facility complexity and space requirements increase
Solution Approach 1:
The invention applies universality by designing a single lance nozzle that can serve multiple functions - handling both high carbon concentration and low carbon concentration refining operations. The adjustable partition wall enables one nozzle to provide adequate expansion conditions for different carbon concentrations, replacing the need for multiple specialized nozzles.
Solution Approach 2:
The invention extracts the adaptability function from multiple separate nozzles and concentrates it into a single nozzle through the movable partition wall mechanism. This removes the need to manage multiple nozzles on standby, simplifying the facility while maintaining the ability to provide adequate expansion conditions for different carbon concentration regions.
3Adaptability or versatility
If a mechanically movable part is provided in the nozzle, then the nozzle can adapt to different carbon concentration regions, but friction and wear occur reducing service life
Solution Approach 1:
The invention applies dynamics by making the nozzle throat area adjustable through a movable partition wall that can change the effective throat diameter. This allows a single nozzle to adapt between high carbon concentration region (smaller throat area) and low carbon concentration region (larger throat area) conditions, eliminating the need for multiple nozzles and operational interruptions during switching.
4Ease of operation
If the nozzle throat area is changed mechanically, then oxygen flow rate can be controlled for different carbon concentration regions, but the structure becomes complicated
Solution Approach 1:
The invention applies segmentation by dividing the nozzle throat into multiple segments using a partition wall that can be moved to change the effective throat area. This segmented structure allows simple adjustment of oxygen flow rate by moving the partition wall, providing easy operation while keeping the overall structure relatively simple compared to complex mechanical adjustment mechanisms.
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 flexible control of oxygen-blowing conditions without changing nozzles, improving energy efficiency and reducing wear, allowing for continuous operation with reduced space and equipment complexity.
Implementation Method 1
the gas is fed through the blowing hole to form a fluid wall inside the nozzle so that an apparent throat diameter of the nozzle is changed
Data Source
AI summary
A top-blowing lance nozzle is configured to freely switch an adequate expansion condition so as to control an oxygen-blowing amount and a jetting velocity independently of each other without requiring a plurality of lance nozzles or a mechanically movable part. A lance nozzle is configured to blow refining oxygen to molten iron charged in a reaction vessel while a gas is blown from a top-blowing lance to the molten iron. One or more blowing holes for blowing a working gas are on an inner wall side surface of the nozzle, at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site.