Plasma-Assisted Syngas Refining with Segmented Flow Zones
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Solution Overview
Problem
Prior art systems face challenges in efficiently converting tar in syngas due to poor mixing of air and syngas components, leading to unstable flames and inconsistent temperature profiles, which reduces tar conversion efficiency and causes corrosion in reactors.
Innovation Solution
A plasma-assisted system with a refining chamber featuring multiple flow zones, including a core reaction zone for swirling syngas and air mixing and a peripheral zone for buffering, along with plasma torches that promote recirculation to enhance mixing and tar conversion, while minimizing reactor wall exposure to high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air and syngas are mixed in a single zone without flow separation, then the mixing process is simpler, but the flame stability and temperature profile consistency deteriorate
Solution Approach 1:
The reactor is divided into a core reaction zone for combustion and a peripheral zone for buffering flow, creating distinct functional regions that improve flame stability while maintaining manageable system complexity
Solution Approach 2:
Different zones within the reactor are assigned different flow characteristics - the core zone provides intense mixing for combustion while the peripheral zone provides stable buffering flow, allowing each region to optimize its local function
2Productivity
If plasma is applied to treat tar in syngas, then tar conversion efficiency is improved, but reactor wall corrosion increases
Solution Approach 1:
The reactor zones are segmented such that the core reaction zone where plasma is applied for tar conversion is separated from the reactor walls by a peripheral buffering zone, reducing direct plasma exposure of walls
Solution Approach 2:
The peripheral buffering flow acts as an intermediary layer between the high-energy plasma core zone and the reactor walls, protecting the walls from direct plasma exposure and associated corrosion
3Productivity
If high temperature plasma is used to break down tar, then tar removal is enhanced, but energy consumption increases
Solution Approach 1:
Plasma is applied locally in the core reaction zone where tar concentration is highest, rather than throughout the entire reactor volume, concentrating energy input where it is most needed
Solution Approach 2:
The system uses a portion of the syngas itself as the plasma feedstock, allowing the fuel to serve dual purposes as both energy source and reaction medium, reducing external energy requirements
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 system achieves stable flame ignition, consistent temperature profiles, and improved tar conversion efficiency, while protecting reactor walls from corrosion, thereby maximizing energy density and reducing parasitic power consumption and maintenance downtime.
Implementation Method 1
Plasma refinement reduces the larger hydrocarbon molecules in the product gas to a combination of hydrogen, carbon monoxide, carbon dioxide and steam, with some trace contaminants, through the processes of thermal decomposition and plasma catalysis
Implementation Method 2
Plasma refinement reduces the larger hydrocarbon molecules in the product gas to a combination of hydrogen, carbon monoxide, carbon dioxide and steam, with some trace contaminants, through the processes of thermal decomposition and plasma catalysis
Implementation Method 3
a core reaction zone where syngas and air/process additives flow in a swirling pattern for mixing and combustion
Implementation Method 4
at least one peripheral zone within the reactor which forms a boundary layer of a buffering flow along the reactor walls
Implementation Method 5
air injection patterns that create a recirculation zone to promote mixing between the high temperature products at the core reaction zone of the vessel and the buffering layer
Implementation Method 6
in the core reaction zone, syngas and air/process additives mixture are ignited in close proximity to the plasma arc
Data Source
AI summary
This disclosure provides a system and method for conversion of raw syngas and tars into refined syngas, while optionally minimizing the parasitic losses of the process and maximizing the usable energy density of the product syngas. The system includes a reactor including a refining chamber for refining syngas comprising one or more inlets configured to promote at least two flow zones: a central zone where syngas and air/process additives flow in a swirling pattern for mixing and combustion in the high temperature central zone; at least one peripheral zone within the reactor which forms a boundary layer of a buffering flow along the reactor walls, (b) plasma torches that inject plasma into the central zone, and (c) air injection patterns that create a recirculation zone to promotes mixing between the high temperature products at the core reaction zone of the vessel and the buffering layer, wherein in the central zone, syngas and air/process additives mixture are ignited in close proximity to the plasma arc, coming into contact with each other, concurrently, at the entrance to the reaction chamber and method of using the system.