Fluidized Bed Nanocarbon Production via Self-Combustion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing nanocarbon require high energy consumption, leading to increased costs and carbon dioxide emissions, and often result in the precipitation of amorphous carbon on catalysts, which deteriorates their activity and hampers mass production efficiency.
Innovation Solution
A method involving the formation of a fluidized bed using a low hydrocarbon and oxygen with a fluid catalyst or a catalyst combined with a fluid medium, where the hydrocarbon is decomposed through self-combustion, reducing energy needs and preventing amorphous carbon precipitation by recycling exhaust gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (arc discharge, CVD, fluidized bed) are used to produce nanocarbon, then nanocarbon can be manufactured, but high energy consumption occurs and carbon dioxide emissions increase
Solution Approach 1:
The invention utilizes the self-combustion of low hydrocarbon gas to provide the heat required for nanocarbon production. The low hydrocarbon gas (methane, ethane, propane, or butane) combusts within the fluidized bed reactor, generating sufficient thermal energy (800-1000°C) to decompose the hydrocarbon and form nanocarbon without requiring external heating systems. This self-heating mechanism dramatically reduces energy consumption and eliminates the need for separate fuel combustion systems.
Solution Approach 2:
The invention changes the operational parameters by controlling the oxygen concentration in the low hydrocarbon gas to be 25% by volume or less. This specific parameter range allows the hydrocarbon to self-combust and generate sufficient heat for nanocarbon production while preventing excessive carbon dioxide formation. The controlled combustion parameters enable efficient energy utilization and reduce harmful emissions.
2Productivity
If conventional thermal decomposition methods are used, then nanocarbon is produced, but amorphous carbon precipitates on the catalyst deteriorating its activity
Solution Approach 1:
The invention implements a feedback mechanism by recycling the exhaust gas from the fluidized bed reactor back into the reactor. The exhaust gas contains unreacted low hydrocarbon and combustion products. By recycling this gas, the system maintains optimal combustion conditions and prevents the formation of amorphous carbon on the catalyst surface. The continuous feedback loop ensures stable catalyst activity and sustained nanocarbon production efficiency.
Solution Approach 2:
The invention ensures continuous useful action by maintaining a steady state of low hydrocarbon combustion within the fluidized bed. The continuous supply of low hydrocarbon gas with controlled oxygen content (≤25% by volume) ensures uninterrupted self-combustion and nanocarbon formation. This continuous process prevents catalyst deactivation by avoiding the periodic shutdowns and restarts that could lead to amorphous carbon precipitation.
3Temperature
If high temperature heating is applied to produce nanocarbon, then decomposition reaction proceeds, but large amount of carbon dioxide is generated
Solution Approach 1:
The system uses the self-combustion of low hydrocarbon gas to generate the required reaction temperature (800-1000°C) without external fuel combustion. The low hydrocarbon acts as both the carbon source for nanocarbon production and the fuel for heating, eliminating the need for separate fuel systems that would generate additional carbon dioxide emissions.
Solution Approach 2:
By controlling the oxygen concentration in the low hydrocarbon gas to 25% by volume or less, the invention optimizes the combustion reaction to produce sufficient heat while minimizing carbon dioxide generation. This parameter control ensures incomplete combustion that favors nanocarbon formation over complete oxidation to CO2, reducing harmful emissions while maintaining effective reaction temperature.
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 lowers energy consumption, prevents catalyst deterioration, and enables efficient mass production of nanocarbon while minimizing carbon dioxide generation.
Implementation Method 1
producing nanocarbon and hydrogen by a decomposition reaction of the low hydrocarbon accompanied by a self-combustion of the low hydrocarbon and the oxygen
Implementation Method 2
forming a fluidized bed by supplying a low hydrocarbon and oxygen to a fluid catalyst or a fluid catalyst used in combination with a fluid medium
Implementation Method 3
a decomposition reaction of the low hydrocarbon accompanied by a self-combustion of the low hydrocarbon and the oxygen
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A lower hydrocarbon and oxygen are supplied to a fluid catalyst (1) to form a fluidized bed, and nanocarbon and hydrogen are produced by a decomposition reaction of the lower hydrocarbon that accompanies self-combustion of the lower hydrocarbon and oxygen using a nanocarbon manufacturing device having a fluidized bed reactor (2) housing a fluid catalyst (1) and supplied with a lower hydrocarbon and oxygen such that the lower hydrocarbon and oxygen can self-combust, a gas feed part (5) that is connected to the fluidized bed reactor (2) and supplies lower hydrocarbon and oxygen into the fluidized bed reactor (2), a waste gas channel (8) that is connected to the fluidized bed reactor (2) and discharges the waste gas in the fluidized bed reactor (2) to the outside, and a supply part (2a) that is connected to the fluidized bed reactor (2) and supplies the fluid catalyst (1) into the fluidized bed reactor (2).