Converter Bottom Blowing Lance Sharing Biochar and Lime Powder
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Solution Overview
Problem
The existing converter steelmaking process faces challenges with the construction difficulty of the furnace bottom and increased risk of blockage and instability due to the use of multiple separate bottom blowing lances for biochar and lime powder, which complicates the operation and safety of the system.
Innovation Solution
A converter bottom blowing system that allows multiple media to share bottom blowing lances, utilizing a three-way valve and cut-off valves to manage different gas sources and powders, enabling biochar and lime powder to be sprayed through a common lance, reducing the number of lances and minimizing blockage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate bottom blowing lances are used for biochar powder and lime powder, then the risk of explosion is prevented and dephosphorization/desulfurization requirements are met, but the construction difficulty of the furnace bottom increases and the number of lances increases blockage risk
Solution Approach 1:
The system divides the bottom blowing lances into functional segments with different gas inlet configurations. Some lances are equipped with both oxygen and nitrogen inlets, allowing selective operation modes. This segmentation enables a single lance to replace multiple separate lances while maintaining the ability to prevent explosion by using nitrogen for biochar powder and oxygen for lime powder when needed.
Solution Approach 2:
The bottom blowing lances are designed with multi-functionality to handle both biochar powder and lime powder delivery. By incorporating multiple gas inlet channels (oxygen and nitrogen) into a single lance structure, the system achieves universal capability to serve multiple purposes: preventing explosion with nitrogen, enabling high oxygen potential for dephosphorization/desulfurization with oxygen, and reducing the overall number of lances required.
2Adaptability or versatility
If multiple separate bottom blowing lances are installed, then different carrier gases can be used for biochar and lime powder, but the furnace bottom space arrangement becomes difficult and operational stability decreases
Solution Approach 1:
The system implements dynamic control capabilities where the carrier gas type (oxygen or nitrogen) can be switched based on operational requirements. The bottom blowing lances are equipped with controllable valves and switching mechanisms that allow operators to dynamically adjust the gas carrier being used, providing flexibility while maintaining operational stability through centralized control.
Solution Approach 2:
The patent introduces a multi-channel gas distribution system with intermediary control valves and switching mechanisms that mediate between the gas sources (oxygen and nitrogen) and the bottom blowing lances. This intermediary layer enables flexible carrier gas selection while simplifying operation by providing centralized control and automatic switching capabilities, reducing the complexity of managing multiple separate lance systems.
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 solution reduces the number of bottom blowing lances, enhances operational stability, and prolongs the system's life by allowing biochar and lime powder to share a common pipe, thereby decreasing blockage risks and improving structural integrity and safety.
Implementation Method 1
utilizing a three-way valve and cut-off valves to manage different gas sources and powders
Implementation Method 2
lime powder made into powder or fine particles, and oxygen used as the carrier gas continuously sprayed into the deep part of the molten pool
Implementation Method 3
oxygen used as the carrier gas continuously sprayed into the deep part of the molten pool
Implementation Method 4
the mass transfer process is accelerated due to the agitation of the gas, thereby greatly improving the kinetic conditions of the reaction in the molten pool
Data Source
AI summary
A converter bottom blowing system comprises a first gas source connected in parallel with a lime powder silo, a lime powder blowing tank and a first injector, where a first cut-off valve is arranged between the lime powder blowing tank and the first injector; a second gas source connected in parallel with the biochar powder silo, the biochar powder blowing tank and the second injector, where a second cut-off valve is arranged between the biochar powder blowing tank and the second injector; a converter, where a plurality of bottom blowing lances are arrayed at a bottom of a converter, the bottom blowing lances are connected with the first injector and the second injector through a three-way valve, a third cut-off valve is arranged between the first injector and the three-way valve, and a fourth cut-off valve is arranged between the second injector and the three-way valve.