Biochar Yield Optimization via Controlled Gasification Temperature
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Solution Overview
Problem
Existing biomass gasification processes face challenges in producing a solid coproduct like biochar due to high gasification temperatures that cause ash-forming compounds to soften and sinter, while lower temperatures result in lower fuel conversion and reduced biochar yield.
Innovation Solution
A method and process arrangement that gasify bio-based raw materials at a controlled temperature of 750-850°C, using a gasifier with temperature control and recovery devices to maximize biochar yield, and recirculating a portion of the biochar back into the gasifier, with an oxidizer like oxygen or air to maintain optimal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gasification temperature is set to high level (850-1000°C) to maximise synthesis gas production, then fuel conversion is improved, but ash-forming compounds soften and sinter, reducing solid coproduct yield
Solution Approach 1:
The patent applies parameter changes by adjusting the gasification temperature to a specific range (750-850°C) that optimizes both synthesis gas production and solid coproduct yield. This temperature parameter modification allows ash-forming compounds to remain stable while maintaining fuel conversion efficiency, thereby producing higher quantities of solid coproduct without sacrificing gas production.
2Quantity of substance
If gasification temperature is lowered to prevent ash softening and sintering, then solid coproduct yield is improved, but fuel conversion decreases
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the gasification temperature within the 750-850°C range. This parameter optimization ensures that the temperature is high enough to maintain good fuel conversion (above 70%) while low enough to prevent ash-forming compounds from softening and sintering, thereby maximizing solid coproduct yield.
3Productivity
If oxygen is supplied at high level (25-40% of stoichiometric need) to improve gasification efficiency, then synthesis gas production is maximized, but ash-forming compounds are more likely to sinter
Solution Approach 1:
The patent applies parameter changes by optimizing the oxygen supply to 10-20% of stoichiometric oxygen need, which is lower than conventional levels. This modified oxygen parameter reduces the risk of ash-forming compound sintering while maintaining adequate fuel conversion (above 70%) and synthesis gas production, thereby eliminating the harmful effect of ash sintering without sacrificing 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
This approach effectively increases the yield of biochar to 10-20% of the bio-based raw material's carbon content, making it suitable for further processing and utilization as a soil conditioner, fuel, or industrial raw material, while also producing synthesis gas with improved H2/CO ratios.
Implementation Method 1
gasifying bio-based raw material (1) for forming a product gas (4) and a solid coproduct (5)
Implementation Method 2
an oxidizer (8) is fed to the gasifier to provide a desired temperature during the gasification
Data Source
AI summary
The invention relates to a method and a process arrangement for producing a solid product, e.g. biochar, by means of a gasification. Bio-based raw material (1) is gasified for forming a product gas (4) and a solid co-product (5) in a gasifier (2), and a gasification temperature is arranged to temperature of 750 - 850° C. for increasing a yield of the solid co-product. Further, the invention relates to the use of the solid co-product.