Rotating Drum Ash Removal in Pellet Burners
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Solution Overview
Problem
Existing pellet burners face conflicts between primary air and ash discharge, as they compete for space and have opposing directions of movement, leading to inefficiencies and potential failures in combustion and ash removal processes.
Innovation Solution
A rectangular opening in the combustion chamber's base with a rotatable circular cylindrical burner base allows ash discharge while enabling primary air to enter through a gap, with adjustable gap widths achieved by varying the drum's radius and movement, ensuring both air and ash move in the same direction, thus improving combustion efficiency and ash removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotatable burner base is used for ash discharge, then ash removal is improved, but primary air supply is impaired due to space competition and opposing movement directions
Solution Approach 1:
The burner base is segmented into a rotating ash discharge section and a stationary primary air supply section. The rotating burner base includes a discharge opening for ash removal, while the stationary housing contains the primary air supply opening. This segmentation allows independent optimization of ash discharge and air supply functions without mutual interference.
Solution Approach 2:
The primary air supply function is extracted from the rotating burner base and placed in a stationary housing. The burner base rotates independently for ash discharge, while the primary air supply remains stationary, eliminating the conflict between rotating ash discharge and air supply movements.
2Productivity
If the burner base rotates for ash discharge, then ash removal is improved, but combustion stability deteriorates due to varying gap widths
Solution Approach 1:
The primary air supply function is extracted from the rotating burner base and placed in a stationary housing. The burner base rotates independently for ash discharge, while the primary air supply remains stationary, eliminating the conflict between rotating ash discharge and air supply movements.
Solution Approach 2:
The system employs dynamic ash discharge through rotation of the burner base, while maintaining static primary air supply. This dynamic-static combination allows efficient ash removal without compromising combustion stability, as the air supply remains constant while ash is actively discharged.
3Adaptability or versatility
If a complex control system is added for regulating primary air and secondary air separately, then combustion control is improved, but device complexity increases
Solution Approach 1:
The blower is designed as a multi-functional device that simultaneously controls both primary air supply and secondary air supply. By using a single blower with adjustable output, the system achieves versatile combustion control without the complexity of separate control systems for each air stream.
Solution Approach 2:
The control functions for primary air and secondary air are merged into a single blower control system. This consolidation simplifies the device by eliminating the need for separate blowers and control mechanisms, while still providing adaptable combustion control through the blower's adjustable performance.
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 ensures reliable and efficient ash removal without additional costs, maintains a consistent ember bed, reduces emissions, and allows for automatic adjustment of air flows based on operating conditions, enhancing the pellet stove's performance and efficiency.
Implementation Method 1
a circular cylindrical burner base (drum, roller) rotatable about its horizontal axis is provided with this axis parallel to the longitudinal direction of the opening, such that its generating elements are spaced from the edges of the opening (gap). This space is dimensioned to allow ash to be discharged, embers to be pushed aside, and primary air to enter through this gap when the burner base rotates.
Data Source
Figure 1~3
Figure 4~6
Figure 7~9
AI summary
The invention relates to a pellet burner (6) with adjustable primary air (4) and an ash removal device, comprising a combustion chamber (9) in the lowest region of which, the burner base, at least one inlet opening for the primary air (4) and the ash removal device are formed. To improve the control of the primary air and to improve ash removal, the ash removal device is provided as a drum (8) rotatably mounted about an axis of rotation inclined at no more than 20° to the horizontal; the drum substantially closes an opening in the lowest region of the combustion chamber (2); and a gap (7) for ash removal remains between the drum (8) and the edges of the opening, through which primary air (4) also enters the combustion chamber. In various embodiments, the drum (8) is provided with different radii around its circumference, and/or has bores (8), and/or its surface has ridges.