Segmented Grate Track Separation Elements for Heat Dissipation
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Solution Overview
Problem
Existing grate track separating elements in pusher grate firing systems have a short service life due to blowholes formed during casting, which impede heat dissipation and lead to local overheating and bursting, limiting their operational life to approximately one year.
Innovation Solution
A grate track separating element with a flat upper bearing surface, upright end face, and recessed rear grate bar carrier design, allowing for improved adaptation to grate bar geometry, enhanced castability, and integration of tubular water-cooling lines in meandering paths, which facilitates better heat management and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional U-shaped grate separation elements are manufactured as water-coolable castings, then temperature resistance is ensured, but casting defects (blowholes) form that impede heat dissipation and cause localized overheating
Solution Approach 1:
The grate separation element is divided into multiple segments (first grate separation element, second grate separation element, etc.) arranged in sequence. This segmentation allows each segment to be cast independently, reducing the formation of large blowholes, and enables modular replacement if one segment fails, thereby improving overall reliability while maintaining temperature resistance through water cooling channels in each segment.
Solution Approach 2:
Water cooling channels are integrated specifically in the grate separation elements where they are most needed for heat dissipation. The casting process is optimized to ensure proper channel formation without creating defects in critical areas. This local application of cooling quality ensures temperature resistance is provided exactly where thermal loads are highest, while avoiding unnecessary complexity in less critical areas.
2Adaptability or versatility
If grate separation elements are designed with complex shapes for optimal fit, then adaptation to grate bar geometry is improved, but casting complexity increases and defects are more likely
Solution Approach 1:
The grate separation structure is segmented into multiple simpler elements (first grate separation element, second grate separation element, third grate separation element) that can be cast using standard, well-controlled processes. Each segment has a manageable geometry that is easier to cast without defects compared to a single complex U-shaped element, while the collective arrangement of segments achieves the required adaptation to grate bar geometry.
Solution Approach 2:
Multiple grate separation elements are arranged and connected in sequence to form the complete central beam structure. This merging of simpler castable components achieves the functional equivalence of a complex single piece, while benefiting from the improved castability and reduced defect risk of multiple smaller, simpler castings.
3Strength
If grate separation elements are made as single integrated components, then structural integrity is maintained, but casting defects such as blowholes form during the casting process
Solution Approach 1:
The grate separation element is segmented into multiple sections (first grate separation element, second grate separation element, etc.) that are cast separately and then assembled. This segmentation reduces the casting size and complexity for each individual piece, minimizing the formation of blowholes and other casting defects. The segmented structure maintains structural integrity through proper connection design between segments while improving manufacturing quality.
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 extends the service life of grate track separating elements by preventing overheating, improving castability, and ensuring effective heat dissipation, while maintaining structural integrity and compatibility with existing grate bar configurations.
Implementation Method 1
tubular water-flowing channels which are formed in the casting walls during its casting
Implementation Method 2
these cavities impede heat transfer from the outside of such grate separation elements to the water-carrying cooling pipes inside
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a feed grate of a grate furnace, comprising grate tracks which are made of individual grate rods (7, 8) that are arranged in multiple longitudinal and transverse rows in a stepped manner and which are inclined. A central beam (13) which is made of a plurality of individual grate track separation elements (4) arranged in a row in a stationary manner is formed between two grate tracks, and a respective first stationary grate rod (7) and a paired second grate rod (8) which can be moved in a feeding direction are arranged multiple times in each of the grate track (2) rod rows (5) adjacent to the grate track separation elements (4) in the longitudinal direction (L). Each of the grate track separation elements (4) is formed as a cast part with tubular lines through which water can flow and which are formed in cast part walls during the casting process of the cast part. A readily castable grate track separation element is to be provided with an improved adaptation to the grate rod geometry of the feed grate. This is achieved in that at least some of the plurality of grate track separation elements (4) have a flat support surface (15) on the upper face, an upright end surface (16) on the front face in the feed direction of the feed grate (1), and a front support surface (17) and, at a distance therefrom, a rear grate rod support receiving area (18), which is designed in the form of a recess, on the lower face.