Direct Biochar Cooling for Carbon Content and Surface Area

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Solution Overview

Problem

Existing biochar cooling methods, such as indirect cooling using heated steam or hydrocarbon gases, fail to produce biochar with enhanced carbon content and surface area suitable for high-value applications like activated carbon or graphene production, resulting in biochar that is not useful for these purposes.

Innovation Solution

A direct cooling method involving the application of cool steam or hydrocarbon gases directly to hot biochar in a cooling chamber, followed by drying, to enhance the carbon content and surface area of the biochar, and recover hydrogen as a byproduct.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If indirect cooling using heated steam or hydrocarbon gases is used, then the biochar can be cooled, but the carbon content and surface area are not enhanced sufficiently for high-value applications

Engineering Contradiction:

Improvebiochar coolingVSAvoidcarbon content and surface area quality

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent replaces indirect thermal cooling with a chemical transformation process. Instead of simply removing heat through steam or gas contact, the method uses catalytic decomposition of hydrocarbon gases at controlled temperatures (500-900°C) to deposit carbon directly onto the biochar surface, thereby enhancing carbon content and surface area while maintaining cooling functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the temperature parameter control to optimize both cooling and carbon enhancement. By maintaining the biochar at 500-900°C during the cooling process and controlling the residence time of hydrocarbon gases, the system transforms the cooling operation into a dual-function process that simultaneously cools and enhances carbon content and surface area.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If direct cooling with cool steam is applied, then cooling efficiency improves, but moisture content increases requiring additional drying steps

Engineering Contradiction:

Improvecooling efficiencyVSAvoidmoisture content

Core Design Contradiction:

TemperatureVSLoss of substance

Solution Approach 1:

The patent merges the cooling function with the carbon enhancement function into a single integrated process. By introducing hydrocarbon gases instead of steam for direct cooling, the system achieves both cooling and carbon deposition simultaneously, eliminating the need for separate drying operations that would be required with steam-based cooling.

Inventive Principle:

Principle #5Merging (Combining)

3Manufacturing precision

If hydrocarbon gases are used for direct cooling, then carbon content is enhanced, but hydrogen byproduct requires recovery and separation

Engineering Contradiction:

Improvecarbon content enhancementVSAvoidhydrogen recovery system

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent converts the hydrogen byproduct, which could be considered a waste stream requiring separation, into a valuable recoverable resource. The catalytic decomposition process generates hydrogen that can be captured and utilized as a useful byproduct, transforming a potential complexity into an economic benefit.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 method produces biochar with increased surface area and high-quality carbon content, making it comparable to activated carbon and enabling hydrogen recovery, thus enhancing its value and usability in various industrial applications.

Implementation Method 1

applying cool steam or hydrocarbon gases directly to hot biochar in a cooling chamber

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

the application of cool steam or hydrocarbon gases directly to hot biochar... to enhance the carbon content and surface area of the biochar

Methodology Applied

Scientific EffectDecomposition: Decomposition (biological)

Implementation Method 3

followed by drying, to enhance the carbon content and surface area of the biochar

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS11268030B1Direct biochar cooling methods and systems

Publication Date: 2022.03.08 ARIES CLEAN TECHNOLOGIES LLC

AI summary

Apparatus and associated methods relate to cooling hot biochar based on applying cool gas directly to the hot biochar. The gas may be steam comprising water vapor. Biochar may be cooled in a cooling chamber by cool steam injected into a steam loop configured to cool the steam. The biochar cooled with steam may be dried in a drying chamber by dry gas injected from a gas loop. The gas may be hydrocarbon gas. Biochar may be heated in a processing chamber. Heated biochar may be cooled in a cooling chamber by cool hydrocarbon gas injected to the cooling chamber. Biochar in the processing chamber may be heated with heat recovered from cooling. Filtered byproducts and tail gas may be recovered from the cooling chamber. Tail gas may be recycled. Various direct biochar cooling implementations may produce biochar having enhanced carbon content, increased surface area, and a hydrogen stream byproduct.