Automated Biomass Flow Management in Fixed Bed Gasifiers
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Solution Overview
Problem
Biomass gasifiers face challenges with solids flow management, including bridging, clinker formation, and manual intervention required to clear jams, which disrupts production and increases labor costs, particularly due to non-uniform solids flow and tar buildup affecting engine operation.
Innovation Solution
The implementation of automated solid flow management methods in fixed bed gasifiers, including aliquot metering, radial mixing without vertical displacement, size selectivity, and shock-induced displacement, along with vibration excitation of gasifier walls, using sensors and adjustable grate assemblies to prevent bridging and ensure consistent feed rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual shaking and jiggle methods are used to clear biomass jams, then bridging is removed, but production is stopped and labor costs increase
Solution Approach 1:
The system uses sensors to detect biomass flow status and automatically activates the grate shaking mechanism to clear jams, enabling the system to service itself without manual intervention and maintaining continuous production
Solution Approach 2:
Material presence sensors provide feedback on biomass flow status, which is used by control logic to automatically activate or deactivate the grate shaking mechanism, ensuring continuous operation without manual intervention
2Device complexity
If gravity drop equipment is used for biomass flow management, then equipment simplicity is maintained, but bridging and manual intervention are required
Solution Approach 1:
The system automatically detects and clears biomass flow obstructions using sensors and automated grate shaking, eliminating the need for manual intervention while maintaining equipment simplicity
Solution Approach 2:
Material presence sensors monitor biomass flow status and provide feedback to automatically control the grate shaking mechanism, ensuring continuous operation without manual intervention
3Productivity
If non-uniform solids flow occurs, then gasifier operation continues, but clinker formation increases
Solution Approach 1:
The grate shaking mechanism operates periodically or continuously under automated control to maintain uniform solids flow distribution, preventing localized overheating and clinker formation while maintaining continuous gasifier operation
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
These methods effectively prevent bridging and ensure continuous biomass flow, reducing manual intervention, maintaining constant synthesis gas supply, and enhancing gasifier efficiency and safety by decoupling solids flow from input/output processes, allowing for various biomass types and moisture levels.
Implementation Method 1
vibration excitation of gasifier walls
Implementation Method 2
shock-induced displacement
Data Source
AI summary
A method is described for processing biomass using a series of mechanisms that operate in unison to maintain solids flow through small gasifiers that are otherwise prone to blockage. An automated system that implements these methods is also disclosed.