Solid Fuel Burner Flame Stabilizer Axial Maintenance
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Solution Overview
Problem
Existing solid fuel burners face challenges in maintainability due to the large outer diameters of flame stabilizers and guide members, which prevent direct axial removal from the furnace, necessitating complex maintenance procedures and potential burnout issues.
Innovation Solution
A solid fuel burner design featuring a guide member with a smaller outer diameter than the secondary air nozzle, integrated with a contraction forming member and fin members, allowing for axial removal without scaffolding, while maintaining flame stability and reducing NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer diameter of the guide member is increased to expand the circulation flow region, then flame stability and ignition promotion are improved, but maintainability deteriorates because the guide member cannot be removed axially from the furnace
Solution Approach 1:
The burner system is divided into separable components: the guide member (34) and contraction forming member (50) are made detachable from the secondary air nozzle (11). This segmentation allows the guide member to be removed axially for maintenance while the secondary air nozzle remains in place, resolving the contradiction between needing a large guide member for flame stability and the ability to maintain it easily.
2Ease of repair
If the guide member outer diameter is made smaller than the secondary air nozzle inner diameter to enable axial removal, then maintainability is improved, but the circulation flow region and flame stability may be compromised
Solution Approach 1:
The system transitions from a static, fixed-size guide member to a dynamic configuration where the guide member can be adjusted or replaced. The detachable design allows operators to choose different guide member sizes or configurations based on operational requirements, optimizing both flame stability and maintainability.
Solution Approach 2:
The outer diameter of the guide member is changed to be smaller than the inner diameter of the secondary air nozzle, enabling axial removal while maintaining sufficient circulation flow region. This parameter change resolves the contradiction by finding an optimal dimension that satisfies both maintenance accessibility and flame stability requirements.
3Reliability
If the velocity of combustion gas is increased to cool the flame stabilizer and guide member, then burnout prevention is improved, but energy loss increases
Solution Approach 1:
The high-velocity combustion gas flow serves a dual function: it provides cooling to the flame stabilizer and guide member (preventing burnout) while also contributing to the circulation flow that stabilizes the flame. The system uses the existing gas flow dynamics for self-cooling rather than requiring additional active cooling systems, minimizing energy loss.
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 enhances maintainability by allowing for easy removal of the flame stabilizer and guide member, promotes flame stability, and reduces NOx emissions by ensuring high-speed deflection of combustion gases, thus improving reliability and performance.
Implementation Method 1
a contraction forming member 50 disposed on an upstream side of the guide member 34 with respect to a flow direction of the second flow passage 11a, to narrow a cross-sectional area of the second flow passage 11a
Implementation Method 2
the velocity of the combustion gas flowing near the flame stabilizer and the guide member thereof is increased, such that cooling of the flame stabilizer and the guide member thereof is promoted and burnout thereof is suppressed
Data Source
AI summary
A solid fuel burner is provided with a guide member arranged on an outer circumferential section of a distal end of a first gas nozzle so as to guide a fluid flowing through a second flow passage outward in a radial direction; and a contraction forming member that is arranged on an upstream side of the guide member with respect to the flow direction of the second flow passage so as to reduce the cross sectional area of the second flow passage. An outer diameter of the guide member is formed to be smaller than an inner diameter of an outer peripheral wall of a second gas nozzle. The first gas nozzle, the guide member, and the contraction forming member are configured so as to be integrally attachable/detachable along an axial direction of the first gas nozzle toward the outside of a furnace.