Modular Burner-Lance Nozzle for Rapid Maintenance
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Solution Overview
Problem
The service life of burner-lance units in metallurgical furnaces is limited by the wear and tear on the gas outlet end region, requiring time-intensive and costly maintenance processes, where the entire unit must be dismantled to replace worn parts.
Innovation Solution
A burner-lance unit design featuring releasable connections with screwed threads between the burner tube, burner nozzle, and de Laval nozzle, allowing for independent exchange of nozzles without disassembling the unit, along with a cooling tube to reduce thermal stress and facilitate maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the entire burner-lance unit is dismantled to replace worn nozzles, then the nozzles can be replaced, but the maintenance process becomes time-intensive and costly
Solution Approach 1:
The burner-lance unit is divided into modular segments with standardized connections. The burner tube and lance tube are separated into distinct modules that can be independently removed and replaced, eliminating the need to dismantle the entire unit for nozzle replacement.
Solution Approach 2:
The connection elements incorporate quick-release mechanisms that allow for dynamic assembly and disassembly. This enables maintenance personnel to rapidly replace worn nozzles without time-consuming manual disassembly of the complete burner-lance unit.
2Strength
If the burner-lance unit is designed as an integrated structure, then structural strength is improved, but maintenance requires total disassembly
Solution Approach 1:
The unit is segmented into modular components (burner tube module, lance tube module, connection elements) that maintain structural integrity through standardized coupling mechanisms while allowing independent access to each module for maintenance purposes.
Solution Approach 2:
The burner tube and lance tube are arranged in a nested configuration where the lance tube is positioned within the burner tube. This nested structure maintains compactness and structural strength while allowing the outer burner tube to be removed independently for nozzle replacement.
3Temperature
If additional cooling systems are added to reduce thermal stress, then thermal load is reduced, but device complexity increases
Solution Approach 1:
Cooling channels are integrated only in specific high-thermal-stress regions of the burner tube and lance tube, such as the nozzle mounting areas and connection zones, rather than throughout the entire structure. This provides targeted thermal management while minimizing added complexity.
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
Enables quick and cost-effective maintenance with reduced personnel requirements, extending the service life of the burner-lance unit by allowing for independent exchange of worn components without total disassembly and reducing thermal loads.
Implementation Method 1
the gas outlet end of the lance tube has a de Laval nozzle which is releasably connected to the lance tube
Implementation Method 2
gas to be blown in at supersonic speed in lance mode is especially injected into the furnace chamber
Implementation Method 3
along with a cooling tube to reduce thermal stress and facilitate maintenance
Data Source
AI summary
A burner-lance unit (1) includes at least two gas connections (2a, 2b, 2c), a burner tube (3), and a lance tube (4) that is placed concentrically in the burner tube (3). The burner tube (3) and the lance tube (4) both have a gas inlet end and a gas outlet end (15). The lance tube (4) has a de Laval nozzle (4a) at the gas outlet end thereof. The de Laval nozzle (4a) is releasably connected to the lance tube (4). The burner tube (3) has a burner nozzle (3a) which is releasably connected to the burner tube (3).