Gasification Reactor with Bulk Layer Separator for Carbon Conversion
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Solution Overview
Problem
Conventional fluidized bed gasification processes for converting carbon-containing residues and waste materials into synthesis gas face inefficiencies, including insufficient carbon conversion, incomplete energy utilization, and issues with alkali vapors condensing and clogging equipment, leading to increased pressure loss and plant shutdowns.
Innovation Solution
The implementation of a plant with a gasification reactor featuring a fluidized bed zone and a bulk layer separator downstream, where carbon-containing dust is oxidized above the ash flow temperature and melted mineral content is separated within a ceramic bed, effectively increasing carbon conversion and reducing unwanted by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fluidized bed gasification is used to convert carbon-containing residues into synthesis gas, then the process can handle various waste materials, but carbon conversion is insufficient and synthesis gas yield is low
Solution Approach 1:
The patent changes the operating temperature parameter from conventional moderate temperatures (600-900°C) to high temperatures (900-1200°C) in the gasification reactor. This parameter change enables complete carbon conversion while maintaining fluidized bed operation, thereby increasing synthesis gas yield and resolving the contradiction between productivity and substance loss.
Solution Approach 2:
The patent uses a composite bed material system consisting of inert particles (sand, gravel) combined with reactive limestone. This composite material approach enables high-temperature operation while maintaining fluidized bed characteristics, allowing complete carbon conversion and high synthesis gas yield without sacrificing the advantages of fluidized bed gasification.
2Reliability
If moderate operating temperatures are used in fluidized bed gasification, then ash melting point is not exceeded, but carbon conversion remains insufficient
Solution Approach 1:
The patent raises the operating temperature parameter to 900-1200°C, which exceeds the ash melting point. This parameter change enables complete carbon conversion and high synthesis gas yield. The system maintains reliability by using inert bed materials that can withstand these temperatures and by controlling the residence time of molten ash.
Solution Approach 2:
The patent utilizes the phase transition of ash from solid to liquid state at high temperatures. By operating above the ash melting point, the ash becomes liquid and can be easily separated from the synthesis gas through gravity settling, maintaining system reliability while enabling complete carbon conversion.
3Productivity
If high temperatures above ash flow point are used for complete carbon conversion, then synthesis gas yield increases, but alkali vapors condense and clog separation equipment
Solution Approach 1:
The patent extracts and removes alkali metals from the feedstock through pre-treatment processes before gasification. By removing alkalis in advance, the harmful condensation and clogging of separation equipment is prevented, allowing high-temperature operation for complete carbon conversion without the negative effects of alkali vapor condensation.
Solution Approach 2:
The patent performs preliminary treatment of the feedstock to remove or reduce alkali content before the gasification process. This preliminary action prevents the formation of harmful alkali vapors during high-temperature gasification, enabling complete carbon conversion without equipment clogging.
4Loss of energy
If carbon-containing dust is post-treated by combustion in separate boilers, then carbon is utilized, but design effort and CO2 emissions increase
Solution Approach 1:
The patent merges the carbon conversion function into the main gasification reactor by operating at high temperatures that enable complete carbon conversion. This eliminates the need for separate post-treatment boilers, reducing device complexity while maintaining complete energy utilization. The synthesis gas produced already contains all converted carbon, requiring no additional combustion step.
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 significantly enhances the energy content and quality of synthesis gas produced, reduces the need for additional separation systems, and minimizes CO2 footprint, while also simplifying the transport and disposal of solids and reducing equipment complexity and operational costs.
Implementation Method 1
gasification reactor with at least one fluidized bed zone in which the residues and waste materials are gasified
Implementation Method 2
Thermochemical processes such as pyrolysis and gasification are considered promising for the energetic use of residues and waste materials
Implementation Method 3
carbon-containing dust is oxidized by supplying oxygen
Implementation Method 4
operated above the flow temperature of the ash
Implementation Method 5
separating it from the raw gas within a ceramic bed
Data Source
AI summary
The present invention relates to plant for the conversion of carbon-containing feedstock to a versatile synthesis gas product. The conversion is facilitated by the gasification of carbon-containing biomass and waste materials into synthesis gas. A high carbon-conversion of the biomass and/or waste material is achieved through the incorporation of a post-treatment separation device downstream of the gasifier to further convert the dust and other gaseous by-products in the syngas that still have a significantly high carbon content.