Chip chute with rectangular cross-section for cellulosic material
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Solution Overview
Problem
Traditional systems for feeding comminuted cellulosic materials face issues with plugging and maintaining a steady chip level in the chip chute, especially when replacing high-pressure feeders with pumps, which requires careful dimensioning and is costly due to the need for significant modifications.
Innovation Solution
A chip chute with an elongated, hollow main body having a rectangular cross-section and a transition portion with a circular outlet is designed to minimize plugging and facilitate connection with existing equipment, ensuring a constant or increasing cross-sectional area to accommodate a large volume of material and maintain a steady chip level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional high-pressure feeder is used to feed comminuted cellulosic material, then the material can be fed reliably, but the equipment requires significant modifications and represents high capital cost
Solution Approach 1:
The patent replaces expensive, complex high-pressure feeders with simpler, more economical pump equipment. The chip chute design with rectangular cross-section and transition portion enables this substitution by ensuring reliable material flow without requiring the complex mechanisms of traditional high-pressure feeders, thereby reducing capital cost and modification complexity while maintaining feeding reliability.
2Device complexity
If pumps are located far below the treatment vessel to replace high-pressure feeders, then equipment complexity is reduced, but the chip chute dimensions become critical to avoid plugging and maintain steady chip level
Solution Approach 1:
The patent specifies precise dimensional parameters for the chip chute, including a rectangular cross-section with width W and height H where H≥0.67W, and a transition portion with specific height h≤0.5H. These parameter specifications ensure that the chip chute maintains proper flow characteristics and prevents plugging when pumps are located far below the treatment vessel, thereby reducing the need for high-precision custom dimensioning while avoiding plugging issues.
3Productivity
If the chip chute cross-section area varies significantly, then material flow can be optimized, but the risk of plugging increases and chip level becomes unstable
Solution Approach 1:
The patent applies different cross-section area characteristics to different portions of the chip chute: the main body has a constant or increasing cross-section area to prevent plugging and maintain stable chip level, while the transition portion has controlled dimensions (h≤0.5H) to facilitate smooth flow into the pump. This local differentiation of geometric properties optimizes both material flow efficiency and plugging resistance without requiring significant variation throughout the entire chute.
Data Source
AI summary
A chip chute for transporting wood chips includes: first, second, third, and fourth planar lateral walls defining an open area having a rectangular cross-section, with an inlet opening configured to receive the wood chips, wherein the first and second planar lateral walls oppose each other and extend in a height (H) direction and a first length (Li) direction, and wherein the third and fourth planar lateral walls oppose each other and extend in the height (H) direction and a second length (L2) direction perpendicular to the first length (L1) direction; a curved bottom wall that is located at a bottom of the planar lateral walls and curves from the first planar lateral wall to the second planar lateral wall; and a cylindrical outlet tube protruding laterally from one of the planar lateral walls and configured to discharge the wood chips.