Oscillating Duct Wall for Particulate Bridging
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Solution Overview
Problem
In coal gasification processes, static bridging of particulate material in ducts due to flow restrictions leads to inefficiencies and loss of pressurized gas, reducing mechanical efficiency and causing backflow issues in particulate pumps.
Innovation Solution
A pump system with an oscillating duct wall, controlled to break static bridging by oscillating at specific frequencies, which destabilizes particulate agglomerations and reduces void formation, thereby maintaining efficient flow and preventing gas blowback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is installed at the duct outlet to restrict flow, then backflow is prevented, but static bridging of particulate material occurs due to consolidation
Solution Approach 1:
The patent applies mechanical vibration through an oscillator that vibrates the duct wall at a controlled frequency. This vibration destabilizes the particulate material, breaking static bridging and preventing consolidation that would otherwise occur due to the flow restriction imposed by the check valve. The oscillation frequency is specifically selected to resonate with and disrupt the particulate agglomerations.
Solution Approach 2:
The oscillator provides periodic action by continuously vibrating the duct wall at a controlled frequency. This periodic vibration prevents the formation of static bridges by repeatedly disrupting the particulate material, ensuring that the check valve can maintain its flow restriction function without causing harmful consolidation effects.
2Ease of manufacture
If the duct wall is made stationary to simplify structure, then manufacturing is easier, but static bridging causes void formation and gas escape
Solution Approach 1:
The patent transforms the stationary duct wall into a dynamic structure by coupling it with an oscillator. The duct wall is now capable of controlled vibration, which allows it to actively prevent static bridging and void formation. This dynamic approach maintains structural simplicity while adding the necessary functional capability to disrupt particulate consolidation.
Solution Approach 2:
The oscillator imparts mechanical vibration to the duct wall, creating oscillatory motion that prevents particulate material from forming static bridges and voids. This vibration mechanism addresses the harmful effects while maintaining the overall simplicity of the duct structure.
3Productivity
If oscillation frequency is increased to break static bridging more effectively, then particulate flow efficiency improves, but energy consumption increases
Solution Approach 1:
The patent optimizes the oscillation frequency parameter to achieve effective static bridging disruption at the lowest possible energy consumption. By selecting a specific controlled frequency that resonates with the particulate material properties, the system achieves maximum effectiveness with minimum energy input, rather than using excessively high frequencies.
Solution Approach 2:
The periodic oscillation at a controlled frequency creates efficient disruption of static bridges through resonance effects, achieving effective particulate flow maintenance with optimized energy consumption rather than continuous high-energy vibration.
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 effectively reduces static bridging and maintains high mechanical efficiency by minimizing void formation and gas escape, enhancing the overall performance of particulate pumps in coal gasification systems.
Implementation Method 1
an oscillator coupled with the wall of the duct. The oscillator is operable to oscillate the wall at a controlled frequency with respect to breaking static bridging of particulate in the duct
Data Source
AI summary
A pump system includes a particulate consolidator pump that has a pump outlet. A duct is coupled to the pump outlet. The duct has a wall that is coupled with an oscillator. The oscillator is operable to oscillate the wall at a controlled frequency. The controlled frequency is selected with respect to breaking static bridging of particulate in the duct due, at least in part, to consolidation of the particulate from a downstream check valve.