Biomass Feeding System for Fluidized Bed Gasifier
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Solution Overview
Problem
The existing gasification process in fluidized bed gasifiers experiences inefficiencies due to pressure and temperature differentials, resulting in unreacted biomass material and reduced conversion efficiency when fed through a single inlet.
Innovation Solution
A system comprising multiple screw conveyors circumferentially connected to the gasifier shell, with primary and secondary receptacles, ensures a uniform and continuous feed of biomass material, maintaining homogeneous pressure and temperature conditions within the gasifier, enhancing the conversion of biomass to synthesis gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If biomass material is fed through a single inlet in a fluidized bed gasifier, then the device complexity is reduced, but pressure and temperature differentials occur causing lower conversion efficiency
Solution Approach 1:
The feed system is segmented into multiple screw conveyors (at least two) positioned at different locations around the gasifier inlet, allowing biomass to be introduced at multiple points simultaneously. This segmentation distributes the feed input across different zones, preventing localized overload and promoting more uniform reaction conditions throughout the gasifier, thereby improving conversion efficiency without significantly increasing overall system complexity
2Productivity
If multiple screw conveyors are used to improve pressure and temperature homogeneity, then biomass conversion efficiency increases, but device complexity increases
Solution Approach 1:
Multiple screw conveyors are merged into a coordinated feed system where they operate simultaneously to deliver biomass to different zones of the gasifier. The conveyors are integrated with common support structures and control mechanisms, allowing them to function as a unified system rather than separate independent units, thus achieving improved conversion efficiency while minimizing the increase in device complexity
3Ease of operation
If a single inlet feed system is used, then the ease of operation is improved, but unreacted biomass exits the gasifier reducing process efficiency
Solution Approach 1:
Different zones of the gasifier receive biomass feed at different locations through multiple screw conveyors, creating local quality variations in feed distribution. This allows each zone to receive appropriate biomass input according to its specific reaction conditions, ensuring more complete conversion throughout the gasifier and reducing unreacted biomass in the exit stream, thereby minimizing energy loss
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
This configuration improves the conversion efficiency of biomass to synthesis gas by ensuring uniform pressure and temperature conditions, reducing unreacted biomass and increasing the overall process efficiency of the gasification process.
Implementation Method 1
a first plurality of screw conveyors disposed circumferentially around and connected to or integral with a gasifier shell of the fluidized bed gasifier
Implementation Method 2
the fluid flow and the biomass material feed contact and react to form the synthesis gas
Implementation Method 3
fluidized bed gasifier
Data Source
AI summary
A method and a system are provided for feeding a biomass material feed into a fluidized bed gasifier. The system includes a first plurality of screw conveyors disposed circumferentially around and connected to or integral with a gasifier shell of the fluidized bed gasifier, such that each of the first plurality of screw conveyors is in feed communication with a gasifier chamber defined by the gasifier shell. The system also includes a plurality of secondary receptacles, each individually coupled to a respective screw conveyor of the first plurality of screw conveyors, such that each of the plurality of secondary receptacles includes a secondary receptacle shell defining a secondary receptacle chamber in feed communication with the respective screw conveyor. The system further includes a plurality of primary receptacles, each including a primary receptacle shell defining a primary receptacle chamber in feed communication with at least two of the plurality of secondary receptacles.