Pivoting Furnace Grate Bars for Self-Cleaning Air Gaps
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Solution Overview
Problem
Conventional grates in furnaces suffer from air gaps between grate bars becoming clogged by combustion residues, impeding airflow and reducing combustion efficiency.
Innovation Solution
The grate design incorporates grate bars of varying heights at their ends, allowing for relative movements perpendicular to their longitudinal direction through pivoting, combined with longitudinal movement, to effectively clean air gaps by removing combustion residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grate bars are arranged with air gaps between them, then airflow for combustion is improved, but combustion residues clog the air gaps reducing efficiency
Solution Approach 1:
The grate bars are designed with different heights at their ends, creating relative movements between adjacent grate bars during operation. This dynamic configuration allows the grate bars to automatically clean the air gaps between them through their relative motion, preventing clogging while maintaining open air gaps for combustion airflow
Solution Approach 2:
The system uses the operational movement of the grate bars themselves to clean the air gaps, rather than requiring separate cleaning mechanisms. The relative motion between adjacent grate bars of different heights enables them to scrape and clear combustion residues from the air gaps during normal operation
2Ease of manufacture
If grate bars are made uniform in size, then manufacturing is simplified, but relative movement for cleaning air gaps cannot be achieved
Solution Approach 1:
The grate bars are made uniform along most of their length for ease of manufacturing, but have localized variations in height at specific ends. This allows the majority of the grate bar structure to be standardized while creating the necessary height differences at specific locations to enable relative movement and air gap cleaning functionality
Solution Approach 2:
Adjacent grate bars are designed with asymmetric height variations at their ends, where one grate bar has a higher end and the adjacent grate bar has a lower end. This asymmetric configuration creates the relative vertical movement necessary for cleaning air gaps while maintaining overall structural consistency
3Stability of the object's composition
If grate bars are fixed in position, then structural stability is maintained, but air gaps become clogged and cannot be cleaned
Solution Approach 1:
The grate bars are designed to maintain stable positions during operation, but incorporate controlled relative movements through their different heights. This allows the structure to remain stable while enabling periodic cleaning motion of the air gaps, combining structural stability with self-cleaning capability
Solution Approach 2:
The relative movement between grate bars of different heights occurs continuously during normal operational movement, ensuring that air gap cleaning is an ongoing process rather than a periodic maintenance task. This continuous action prevents clogging while maintaining structural stability
Data Source
Figure 1
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Figure 6
AI summary
A grate (1) for furnaces comprises grate bars (5, 6, 8, 9) and grate rods (4, 7) engaging in receptacles (3) of grate bars (5, 6, 8, 9), by which grate bars (5, 6, 8, 9) can be moved back and forth in the direction of their longitudinal extent. Adjacent grate bars (5, 6, 8, 9) are moved relative to each other by pivoting movements during the back-and-forth movement in order to clean the air gaps between grate bars (5, 6, 8, 9). The direction of the relative movement between adjacent grate bars (5, 6, 8, 9) is essentially horizontal, parallel to the longitudinal extent of the grate bars (5, 6), and essentially perpendicular, due to pivoting movements of the grate bars (8, 9) transverse to the longitudinal extent of the grate bars (8, 9).