Four-Wall Dry Coal Extrusion Pump Design
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Solution Overview
Problem
Current dry coal extrusion pumps face internal shear failure zones and flow stagnation issues, leading to decreased mechanical efficiency in coal gasification processes.
Innovation Solution
A dry particulate material pump with a passageway defined by four identical moving walls, which enhances mechanical efficiency by increasing pumping pressure and reducing friction losses, allowing for lighter and more efficient material transport compared to pumps with fewer moving walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-moving-wall design is used in dry coal extrusion pumps, then the device complexity is reduced, but internal shear failure zones and flow stagnation occur leading to decreased mechanical efficiency
Solution Approach 1:
The pump passageway is divided into four distinct zones by implementing four moving walls instead of two, creating separate compression, conveyance, and discharge zones that eliminate shear failure areas and improve material flow characteristics
Solution Approach 2:
The design transitions from a two-dimensional compression space to a three-dimensional controlled flow environment by adding a fourth moving wall, creating a more complete enclosure that prevents flow stagnation and improves pumping efficiency
2Stress or pressure
If the number of moving walls is increased from two to four, then pumping pressure and aspect ratio efficiency increase by up to 50% and twice respectively, but the device complexity increases
Solution Approach 1:
Each of the four moving walls is independently controllable, allowing dynamic adjustment of compression ratios and flow rates to optimize pumping pressure while maintaining manageable system complexity through modular control
Solution Approach 2:
The four moving walls serve multiple functions simultaneously: compression, conveyance, sealing, and flow control, allowing a single structural element to perform multiple operations that would otherwise require separate components
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 four-moving-wall design achieves up to 50% higher pressure and twice the aspect ratio efficiency compared to two-moving-wall pumps, enabling equivalent performance with reduced weight and improved mechanical efficiency, thus addressing internal shear failure and flow stagnation problems.
Implementation Method 1
reducing friction losses
Data Source
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AI summary
A pump for transporting particulate material includes a passageway (16) defined on each side between an inlet (12) and an outlet (16) by a moving wall (20A-20D). The pump is configured so that essentially an entire perimeter of the passageway is movable. In one embodiment, the passageway comprises four moving walls.