Stoker Thrower Wheel Blade Height Gradient Wear Reduction
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Solution Overview
Problem
Centrifugal wheels in throw feeders experience high wear due to fuel particles hitting the upper edge of vanes, leading to inefficient energy transfer and potential damage, which can be mitigated by reducing wheel speed but at the cost of reduced throwing range and fuel distribution.
Innovation Solution
The centrifugal wheel's blade height increases radially from the inner to the outer end, allowing fuel particles to be continuously accelerated without impact, distributing wear over a larger area and enabling reduced rotational speed, with optional reinforcement and varied wing configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the centrifugal wheel rotates at high speed to achieve sufficient throwing range, then the fuel is thrown farther, but the wear on the upper edges of the vanes increases significantly
Solution Approach 1:
The blade height is made non-uniform, increasing from the inner end to the outer end of each vane. This local variation in geometry allows different regions of the vane to serve different functions: the lower inner region reduces impact wear while the higher outer region maintains throwing range, resolving the contradiction between speed and wear resistance
2Reliability
If the speed of the blast wheel is reduced to reduce wear, then the wear on the vanes decreases, but the throwing range for the fuel is restricted
Solution Approach 1:
By varying the blade height locally along the radial direction, the design enables lower rotational speeds to achieve the same throwing range. The increasing blade height from inner to outer regions provides a gentler acceleration profile that reduces wear while maintaining sufficient fuel ejection distance
3Ease of manufacture
If the height of the blades is constant to simplify manufacturing, then the manufacturing process is easier, but the energy transfer from the centrifugal wheel to the fuel is inefficient
Solution Approach 1:
The blade height is designed to increase from the inner end to the outer end of each vane, creating optimal local conditions for energy transfer. This gradient in blade height allows continuous acceleration of fuel particles, improving kinetic energy transfer efficiency while remaining manufacturable through standard forming processes
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 reduces wear on the vane edges and improves kinetic energy transfer, allowing for optimized fuel distribution and reduced wear, while enabling lower rotational speeds without compromising throwing range.
Implementation Method 1
The fuel is introduced from above in the area of the hub of the centrifugal wheel into the housing of the throwing feeder and then with the help of the wings of the centrifugal wheel it is conveyed horizontally outwards
Data Source
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AI summary
A thrower wheel of a mechanical stoker is disclosed having multiple blades (7), which are disposed on a base plate (2), and a corresponding mechanical stoker. The thrower wheel is characterized in that the height of the blades (7) increases in the radial direction in at least one area and optionally remains the same in one or more remaining areas, and the height of the blade is less at the inner end of the blade than at the outer end of the blade. As a result thereof - in comparison to the prior art (4) - the wear load of the inner blade upper edge is distributed onto a larger area, so that the wear of the blade upper edge is thus decreased. Because better kinetic energy transfer from the thrower wheel to the fuel also occurs by the reduction of the impacts, the rotational speed of the thrower wheel can be reduced.