Adjustable Coal Rope-Breaking Vane for Uniform Pulverized Coal Distribution
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Solution Overview
Problem
Pulverized coal boiler systems face challenges in achieving uniform distribution of pulverized coal and transport air, leading to coal roping issues that cause erosion, reduce combustion efficiency, and increase maintenance difficulties due to localized wear and unwanted pressure drops in the delivery system.
Innovation Solution
A head assembly with adjustable turning and coal rope-breaking vanes within a pipe elbow, allowing for redirection of air and coal particles and easy adjustment of coal rope-breaking vanes to improve distribution while minimizing pressure drop, featuring a removable cover for easy maintenance and repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fixed vanes are used in the head assembly, then structural simplicity is maintained, but coal distribution uniformity and adaptability to different operating conditions deteriorate
Solution Approach 1:
The patent applies the dynamics principle by making the vanes adjustable rather than fixed. The coal rope-breaking vane can be positioned at different angles relative to the coal rope direction, and the turning vane can be adjusted to change the flow direction. This allows the head assembly to adapt to different operating conditions and coal distribution requirements, resolving the contradiction between manufacturing precision and device complexity.
2Manufacturing precision
If coal rope-breaking devices are installed to break up coal ropes, then coal distribution uniformity improves, but pressure drop increases
Solution Approach 1:
The patent applies partial action by using a coal rope-breaking vane that partially intersects the coal rope rather than completely blocking it. The vane is positioned to break up the coal rope structure and improve distribution, but is designed to minimize interference with the overall flow. This allows coal distribution uniformity to improve while keeping pressure drop increases to a minimum.
3Ease of repair
If the head assembly is designed as a single integrated unit, then structural strength is maintained, but ease of maintenance and repair deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the head assembly into separable components. The cover can be removed to provide access to the internal vanes for adjustment and maintenance, while the main body structure remains intact. This allows easy maintenance and repair of the vanes without compromising the overall structural strength of the head assembly.
4Adaptability or versatility
If fixed-angle vanes are used, then device complexity is reduced, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The patent applies dynamics by providing adjustable vanes that can be positioned at different angles according to operating conditions. The coal rope-breaking vane can be adjusted to different angles relative to the coal rope direction, and the turning vane can be rotated to change the flow direction. This provides adaptability to different operating conditions while maintaining relatively simple 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 solution enhances coal distribution within the nozzle assembly, reduces coal roping, and maintains low pressure loss, extending component life and improving combustion efficiency while simplifying maintenance by allowing on-line adjustments and easy access for servicing.
Implementation Method 1
Each turning vane 54 is angled relative to an inlet port 60 and an outlet port 62 of the pipe elbow 58 to redirect a stream of air and pulverized coal particles from the inlet port 60 toward the outlet port 62
Implementation Method 2
Each coal rope-breaking vane 56 is pivotable about an axis 64 to adjust an angle of the coal rope-breaking vane 56 relative to a stream of air and pulverized coal particles from the inlet port 60
Implementation Method 3
The annular space 44 feeds a stream of secondary air into the combustion chamber 14 (FIG. 1), which helps to cool the nozzle tip 36
Implementation Method 4
The pulverizer 24 is operatively connected to an air source (e.g., a fan), whereby the air stream generated by the air source transports the pulverized coal from the pulverizer 24, through the solid fuel ducts 26, through the fuel compartments 12, and into the combustion chamber 14
Data Source
AI summary
A head assembly 52,152 for a pulverized coal nozzle includes a turning vane 54 or a curved vane 154 disposed within a pipe elbow. The vanes 54,154 are angled relative to the inlet port and the outlet port of the pipe elbow to redirect a stream of air and pulverized solid fuel particles from the inlet port 60,160 toward the outlet port 62,162. The coal rope-breaking vane 56 is pivotable about an axis to adjust an angle of the vanes relative to a stream of air and pulverized solid fuel particles from the inlet port 60,160. An adjustment bar 66 may connect to the vanes 56 and extend outward through the pipe elbow to allow the vanes 56 to be adjusted while the pulverized solid fuel particles flow through the head assembly 52. The pipe elbow may further include inspection ports 68,168 and a removable cover 70,170. The vanes may be attached to the removable cover 70,170 thus allowing them to be easily removed and replaced.