Biomass Gasification Catalyst Composite Feedstock
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Solution Overview
Problem
Biomass gasification faces challenges such as maintaining bed composition, fluidization, controlling liquid phases, and agglomeration in gasification reactors, along with high moisture content, which complicates the production of value-added gaseous products like methane.
Innovation Solution
A particulate composition comprising a blend of biomass and non-biomass materials with an alkali metal gasification catalyst, optimized for fluidized bed gasification, where the catalyst is loaded to achieve a specific alkali metal to carbon ratio, allowing for efficient gasification in the presence of steam to produce methane and other gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If biomass alone is used for gasification, then carbon conversion is high, but bed fluidization and composition control become difficult
Solution Approach 1:
The patent combines biomass with non-biomass carbonaceous materials (such as coal or petroleum coke) to create a composite feedstock. This merging allows the system to maintain high carbon conversion from the biomass while the non-biomass component provides structural stability and improves bed fluidization characteristics, resolving the contradiction between carbon conversion efficiency and operational ease.
Solution Approach 2:
The invention uses composite carbonaceous feedstocks consisting of mixed biomass and non-biomass materials. This composite approach leverages the high reactivity of biomass for carbon conversion while the non-biomass component contributes to better physical properties for fluidization, simultaneously achieving both high carbon conversion and easy bed control.
2Productivity
If biomass is used for gasification, then value-added gases are produced, but moisture content is high requiring additional handling
Solution Approach 1:
By combining biomass with non-biomass carbonaceous materials that have lower moisture content, the overall moisture content of the feedstock is reduced. This allows the system to maintain high value-added gas production from the biomass while reducing the complexity of drying and handling systems through the dilution effect of the non-biomass component.
3Productivity
If biomass is gasified, then methane and other gases are formed, but bed agglomeration and liquid phase control become problematic
Solution Approach 1:
The use of composite feedstocks combining biomass and non-biomass materials creates a more stable bed structure during gasification. The non-biomass component acts as a structural matrix that prevents agglomeration and stabilizes the liquid phase, allowing high methane production to proceed with improved bed stability and reliability.
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 solution addresses the challenges of biomass gasification by ensuring proper fluidization and reducing moisture issues, resulting in enhanced carbon conversion and increased efficiency in producing methane and other gaseous products.
Implementation Method 1
a gasification catalyst which, in the presence of steam and under suitable temperature and pressure, exhibits gasification activity whereby a plurality of gases comprising methane and one or more of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons are formed
Implementation Method 2
Through blending appropriate levels of non-biomass materials with the biomass in the feedstock, problems such as bed fluidization may be addressed
Data Source
AI summary
Particulate compositions are described comprising an intimate mixture of a biomass, such as switchgrass or hybrid poplar, a non-biomass carbonaceous material, such as petroleum coke or coal, and a gasification catalyst, where the gasification catalyst is loaded onto at least one of the biomass or non-biomass for gasification in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, and other higher hydrocarbons are formed. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.