Biogas Purification via Segmented Catalytic Oxidation and Adsorption
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Solution Overview
Problem
Biogas used for energy generation often contains contaminants like siloxanes, sulfur, halogenated compounds, and acidic gases, which cause corrosion, erosion, and frequent maintenance issues in engines, necessitating cost-effective purification technologies to ensure efficient and reliable operation.
Innovation Solution
A modular biogas purification system utilizing catalytic oxidation with vanadium oxide on a metal oxide support for sulfur and halogenated compounds, and alkali-impregnated carbon for acidic gases, along with alumina oxide for siloxane removal, to achieve high efficiency in contaminant removal and improve module efficiency through heat recovery from exhaust gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If biogas is used directly for energy generation without purification, then operational simplicity is maintained, but equipment corrosion and frequent maintenance occur due to contaminants
Solution Approach 1:
The purification system is divided into three separate modular units, each targeting specific contaminant types: siloxane removal module, sulfur and halogenated compounds oxidation module, and acidic gases removal module. This segmentation allows each module to be optimized for its specific function while maintaining overall system reliability and operational simplicity.
Solution Approach 2:
The patent introduces intermediate purification modules between the biogas source and the engine. These modules act as mediators that remove contaminants through specific mechanisms (adsorption, catalytic oxidation, absorption) before the gas reaches the engine, preventing corrosion while maintaining operational simplicity.
2Reliability
If comprehensive contaminant removal is implemented, then gas quality and equipment protection are improved, but system complexity and cost increase
Solution Approach 1:
The comprehensive purification is achieved through segmentation into three specialized modules, each handling a specific contaminant group. This approach makes the complex purification process more manageable and easier to implement compared to a single complex system.
Solution Approach 2:
The system uses parameter changes in the form of temperature-controlled catalytic oxidation (200-400°C) for sulfur and halogenated compounds, and selective adsorption conditions for siloxanes. These parameter optimizations allow effective contaminant removal with relatively simple equipment design.
3Manufacturing precision
If multiple contaminant removal modules are added, then gas purification efficiency increases, but operational costs and maintenance requirements increase
Solution Approach 1:
The system employs self-service mechanisms where the catalytic oxidation module operates at temperatures that naturally favor contaminant conversion, and the adsorption modules are designed for straightforward regeneration. These self-service features reduce operational complexity and costs while maintaining high purification efficiency.
Solution Approach 2:
The system recovers heat from exhaust gases to preheat incoming biogas and maintain optimal temperatures in the catalytic oxidation module. This heat recovery reduces energy consumption and operational costs while maintaining high purification efficiency through the multiple modules.
4Reliability
If frequent maintenance is performed to address contamination issues, then equipment reliability is maintained, but operational downtime and productivity loss increase
Solution Approach 1:
The purification modules perform preliminary action by removing contaminants before they reach the engine. The catalytic oxidation module converts sulfur and halogenated compounds into less harmful substances in advance, and the adsorption modules capture siloxanes and acidic gases beforehand, preventing corrosion and extending equipment life without requiring frequent maintenance interruptions.
Solution Approach 2:
The system enables continuous operation by maintaining constant purification through the multiple modules. The catalytic oxidation and adsorption processes continue uninterrupted as biogas flows through the system, ensuring continuous contaminant removal and uninterrupted engine operation, thereby maintaining both reliability and productivity.
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 effectively removes 85% or more of contaminants, reducing maintenance needs, increasing gas quality, and producing pipeline-quality renewable fuels, while minimizing operational costs and downtime.
Implementation Method 1
a catalytic oxidation catalyst comprising vanadium oxide (V2O5) on a metal oxide support where the catalyst oxidizes 85% or more of said sulfur and halogenated compounds
Implementation Method 2
a catalytic oxidation catalyst comprising vanadium oxide (V2O5) on a metal oxide support where the catalyst oxidizes 85% or more of said sulfur and halogenated compounds
Implementation Method 3
a contaminant removal module containing alkali impregnated carbon wherein the alkali comprises an ionic salt of an alkali metal or alkaline earth metal and is present at a level of 5-15% by weight wherein such contaminant removal module removes 85% or more of the acidic reaction products
Implementation Method 4
a first module to remove siloxanes (if present)
Implementation Method 5
the purified biogas, after oxidation of the sulfur and halogenated compounds and removal of the acidic reaction product is combusted, such as for electricity generation, producing heated exhaust gases wherein such exhaust gases are employed to heat any one of the contaminant removal modules to improve such module's efficiency
Data Source
AI summary
The present disclosure relates to a biogas purification system and method for removal of sulfur and halogenated compounds and acidic reaction products from biogas. A contaminant removal module is supplied containing a catalytic oxidation catalyst comprising vanadium oxide (V2O5) on a metal oxide support where the catalyst oxidizes 85% or more of the sulfur and halogenated compounds. This may be followed by a contaminant removal module containing alkali impregnated carbon which removes 85% or more of the acidic reaction products. If siloxane impurities are present in the biogas, one may utilize a contaminant removal module containing alumina oxide.