Waste Processing System with Fluidized Bed Gasifier
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Solution Overview
Problem
Current systems for producing syngas from complex feedstocks face challenges in achieving efficient, cost-effective, and continuous production of high-quality syngas due to varying feedstock compositions and the need for preliminary sorting and processing, as well as inefficiencies in converting all feedstock materials into usable syngas.
Innovation Solution
The integration of a fluidised bed gasifier with a free radical generator, where gases and airborne char from the gasifier are conveyed to the free radical generator, allowing for the breakdown of tars and further conversion of feedstock materials into syngas, optimizing energy use and reducing the need for high-temperature heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gasifiers are used to convert feedstocks into syngas, then syngas production is achieved, but the conversion efficiency is limited and non-airborne char remains unconverted
Solution Approach 1:
A fluidized bed reactor serves as an intermediary device between the gasifier and plasma furnace. It receives non-airborne char from the gasifier, fluidizes it with upward gas flow, and enables complete conversion to syngas through controlled gasification reactions, preventing char deposition and maximizing carbon conversion efficiency
Solution Approach 2:
The system changes operational parameters by introducing a fluidized bed environment with controlled gas flow rates, temperature gradients, and residence times. This transforms the conversion process from partial gasification to complete conversion, achieving near 100% carbon conversion to syngas
2Productivity
If plasma furnaces are used to maximize syngas production from all gases and char, then conversion efficiency improves, but energy consumption increases due to high-temperature requirements
Solution Approach 1:
The conversion process is segmented into two stages: (1) preliminary gasification in a conventional gasifier that converts airborne materials to syngas, and (2) complete conversion of non-airborne char in a fluidized bed reactor. This segmentation allows each stage to operate at optimized temperatures, reducing overall energy consumption while maximizing syngas yield
Solution Approach 2:
The fluidized bed reactor utilizes the syngas produced in the first stage as the gasifying agent for converting non-airborne char. This self-service approach eliminates the need for external high-energy plasma input, achieving complete conversion at lower energy costs
3Ease of operation
If feedstocks with varied composition are processed using standard conditions, then processing simplicity is maintained, but processing quality deteriorates due to inconsistent syngas output
Solution Approach 1:
The fluidized bed reactor provides dynamic adaptation to varying feedstock compositions through its fluidized state, where particles are continuously suspended and mixed. This dynamic environment ensures consistent gasification conditions and stable syngas output regardless of feedstock variability, while requiring only simple operational controls
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 approach enables energy-efficient production of high-quality syngas with a high carbon conversion efficiency, minimizing the production of non-airborne char and ash, and maintaining a stable syngas output, thus overcoming the inefficiencies of previous methods.
Implementation Method 1
A gasifier uses high temperatures and a controlled environmental to break down complex feedstocks without directly combusting the reagents. An oxygen source (normally air) is administered to the gasifier and hydrocarbons present in the material of the feedstock are broken down into carbon monoxide, carbon dioxide and hydrogen.
Implementation Method 2
a free radical generator; wherein the gasifier is in fluid communication with the free radical generator such that gases and airborne char generated by the gasifier are conveyed to the free radical generator
Data Source
AI summary
The invention relates to an apparatus for producing syngas, typically from municipal waste. In particular, a gasifier is used in combination with a plasma furnace. The system is configured so that non-airborne char generated in the gasifier is removed from the system prior to delivery to the plasma furnace. This enhances the energy efficiency of the system whilst still yielding excellent yields of syngas.