SiO2-CaO Reactive Matrix for Cost-Effective Biogas Purification
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Solution Overview
Problem
Existing biogas purification processes are expensive, inefficient, and fail to account for the variability of biogas compositions, leading to suboptimal purification of gases containing harmful components like hydrogen sulfide, mercaptans, silicon compounds, and volatile organic compounds.
Innovation Solution
A process using a reactive matrix composed of SiO2 and CaO with specific weight percentages and humidity levels, combined with additional components, effectively reduces harmful components by chemisorption and physisorption, allowing for matrix regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If physical or reactive adsorption using solid materials is used for biogas purification, then harmful components are removed, but the operation becomes expensive due to material costs and lack of optimization
Solution Approach 1:
The patent optimizes the chemical composition parameters of the reactive matrix, specifically setting SiO2 at 70-90 wt%, CaO at 5-20 wt%, and Al2O3 at 5-15 wt%, to achieve optimal purification efficiency while reducing material costs. This parameter optimization resolves the contradiction by finding the cost-effective composition that maintains high harmful component removal capability
Solution Approach 2:
The patent creates a composite reactive matrix combining multiple materials (silica-based material, calcium oxide, and aluminum oxide) with specific weight ratios. This composite approach enhances purification efficiency while controlling material costs, resolving the contradiction between effective harmful component removal and operational expense
2Ease of operation
If standardized purification processes are used, then implementation is simplified, but efficiency is reduced due to inability to address variability in biogas compositions
Solution Approach 1:
The reactive matrix is designed with a universal composition range (SiO2: 70-90 wt%, CaO: 5-20 wt%, Al2O3: 5-15 wt%) that can effectively treat various biogas compositions regardless of origin or molecular variability. This multi-functional design maintains ease of operation while achieving high purification efficiency across different gas sources
Solution Approach 2:
The patent defines optimized parameter ranges for the reactive matrix composition that adapt to variable biogas inputs. By specifying weight percentage ranges rather than fixed values, the system maintains operational simplicity while achieving consistent high efficiency across varying biogas compositions
3Manufacturing precision
If sophisticated refining processes are used to obtain biomethane, then gas quality is improved, but the process becomes expensive with room for improvement
Solution Approach 1:
The patent employs a composite reactive matrix with optimized material composition (silica-based material 70-90 wt%, calcium oxide 5-20 wt%, aluminum oxide 5-15 wt%) that achieves sophisticated purification results at lower cost. This composite approach delivers high gas quality comparable to conventional sophisticated processes while reducing operational expenses
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
Significantly reduces harmful components in gases, achieving at least 15% reduction, with the potential for complete elimination, and enables matrix regeneration, thus improving efficiency and reducing costs.
Implementation Method 1
A process using a reactive matrix composed of SiO2 and CaO with specific weight percentages and humidity levels, combined with additional components, effectively reduces harmful components by chemisorption and physisorption
Implementation Method 2
A process using a reactive matrix composed of SiO2 and CaO with specific weight percentages and humidity levels, combined with additional components, effectively reduces harmful components by chemisorption and physisorption
Data Source
Figure 1
AI summary
The invention relates to a method for purifying or deodorizing gas by bringing the gas into contact with a reactive matrix comprising: 15 to 80% by dry weight SiO2; and 20 to 40% by dry weight CaO, the moisture content of the matrix ranging from 16 to 80%. The invention also relates to the use of a reactive matrix of this type for purifying or deodorizing a gas.