Burner Slide Damper Eliminates Link Backlash
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Solution Overview
Problem
Conventional pulverized coal burners face challenges in maintaining accurate combustion control due to backlash in link mechanisms, leading to variations in air vane angles and swirling strength over time, which increases manufacturing costs and reduces combustion stability.
Innovation Solution
A burner design featuring a nozzle body with a secondary air adjuster comprising a slide damper and air vanes arranged at predetermined intervals, allowing for adjustable swirling of secondary air and eliminating backlash through a simple configuration that includes partition plates and pressure loss adjusting means, enabling precise airflow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If link mechanisms are used to adjust air vane angles, then combustion control accuracy is improved, but backlash occurs causing variations in air vane angles and swirling strength over time
Solution Approach 1:
The patent removes the link mechanism entirely and replaces it with a slide damper system. The air vane angles are fixed at predetermined intervals, and airflow control is achieved by sliding the damper to open or close passages, eliminating the problematic link mechanism that causes backlash and angle variations over time.
Solution Approach 2:
The patent introduces dynamic control through the slide damper mechanism, which allows continuous adjustment of airflow rates by changing the position of the damper. This dynamic system replaces the static link mechanism with a movable damper that can precisely control the opening degree of air passages, providing both accuracy and stability.
2Ease of operation
If conventional burners with link mechanisms are used, then airflow adjustment is possible, but manufacturing costs increase due to complex assembly requirements
Solution Approach 1:
The patent eliminates the complex link mechanism assembly, reducing manufacturing complexity. The slide damper system requires simpler components with fewer parts, making the burner easier and less expensive to manufacture while maintaining airflow adjustment capability through the damper's sliding motion.
Solution Approach 2:
The patent divides the air adjustment function into separate adjustable elements - the slide damper can be positioned at different locations to control airflow to different regions. This segmentation allows independent control of airflow rates while using simpler, more cost-effective components compared to a unified link mechanism system.
3Adaptability or versatility
If air vanes are made adjustable through link mechanisms, then swirling strength control is improved, but backlash causes variations in swirling strength over time
Solution Approach 1:
The patent removes the link mechanism that connects air vanes to adjustable mechanisms. Instead, the air vanes are fixed at predetermined intervals, and swirling strength control is achieved by adjusting the opening degree of air passages through the slide damper, eliminating the source of backlash that causes swirling strength variations over time.
Solution Approach 2:
The patent controls swirling strength by changing the opening degree parameter of air passages rather than adjusting air vane angles. The slide damper varies the opening degree continuously, providing precise control over the amount of air entering the combustion zone while maintaining stable, consistent swirling strength without the backlash issues of angle-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
The design achieves stable combustion, reduces manufacturing costs, and maintains consistent swirling flow by fixing air vane positions, eliminating backlash and allowing for precise adjustment of airflow rates and swirling strengths, thereby enhancing combustion control.
Implementation Method 1
air vanes arranged at predetermined intervals and circumferentially of the cylindrical space for swirling a secondary air
Implementation Method 2
slide damper axially slidable for surrounding the cylindrical space
Data Source
AI summary
A burner is arranged axially of a burner throat on a furnace wall and includes a nozzle body housed in a wind box and with a secondary air adjuster on a leading end of the nozzle body. The adjuster includes an end plate for defining together with a near-furnace side surface of the wind box a cylindrical space opened in an outer circumference thereof, a slide damper axially slidable for surrounding the cylindrical space, air vanes arranged at predetermined intervals and circumferentially of the cylindrical space for swirling a secondary air and drive means and for slide movement of the slide damper.