Solid Fuel Burner Inductive Member Cooling
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Solution Overview
Problem
Solid-fuel burners face thermal damage issues due to high heat radiation from flames, which increases the temperature of inductive members, leading to potential thermal deformation and corrosion, especially in single-stage combustion where more air is supplied, increasing the inductive member's projected area and heat absorption.
Innovation Solution
The design includes an inductive member between the inner and outer circumferential walls of the air nozzle, directing air flow outwardly, and dividing the inductive member into multiple sections to reduce its projected area, allowing air to flow on both sides and convectively cool it, while also using a guide member to rectify air flow and reduce pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an inductive member is provided at the end portion of the partition wall to change air flow direction to the outer circumference, then air can be injected in the direction of the outer circumference, but heat radiated from the flame causes the temperature of the inductive member to become high, resulting in thermal damage
Solution Approach 1:
The inductive member is divided into multiple sections (first inductive member and second inductive member) arranged in the circumferential direction. This segmentation reduces the projected area of each individual inductive member, thereby reducing heat absorption from flame radiation while maintaining the overall air flow direction control function.
Solution Approach 2:
A cooling air passage is introduced between the inner circumferential wall and the inductive member, allowing cooling air to flow through and convectively cool the inductive member. This intermediary cooling mechanism protects the inductive member from thermal damage caused by flame radiation.
2Productivity
If the inductive member's projected area is increased to improve air flow direction control, then more air can be directed outwardly, but heat absorption from flame radiation increases, causing higher temperature and thermal damage
Solution Approach 1:
The inductive member is segmented into multiple smaller units arranged circumferentially. This maintains the total air flow control capability while reducing the projected area of each segment, thereby reducing heat absorption from flame radiation and lowering the temperature of each inductive member.
Solution Approach 2:
Cooling air is introduced as an intermediary substance to flow between the inner circumferential wall and the inductive member, providing convective cooling that removes heat from the inductive member and maintains it at a lower operating temperature despite exposure to flame radiation.
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 configuration effectively reduces thermal damage by lowering the inductive member's temperature through convective cooling and maintaining the air flow path's area, preventing thermal deformation and corrosion, while also reducing pressure loss and blower power.
Implementation Method 1
there is a problem in that heat radiated from the flame causes the temperature of the inductive member to become high, thereby resulting in the occurrence of thermal damage
Data Source
AI summary
A solid-fuel burner comprising a fuel nozzle for injecting a mixed fluid with a mixture of solid fuel and air as a carrier gas thereof, a plurality of air nozzles provided on the outside of the fuel nozzle for surrounding the fuel nozzle; an end portion of an inner circumferential wall of the air nozzle located at least at the outermost circumference is outwardly expanded, and an inductive member provided at outlet of the air nozzle located at least on the outermost circumference so as to direct flow of air in the direction of outer circumference.