Fluidized-Bed Hydrogen Reactor With Microwave Catalyst Activation
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Solution Overview
Problem
Conventional hydrogen production methods, such as those using thermochemical decomposition or steam reforming, are energy-intensive and generate environmental pollutants like CO2, while existing pyrolysis techniques suffer from catalyst deactivation and low production efficiency due to fixed-bed reaction processes.
Innovation Solution
A hydrogen production device employing a fluidized-bed reactor with a catalyst filler and microwave irradiation, which supplies hydrocarbon gas at a fluidizing flow rate to activate the catalyst for pyrolysis, allowing for continuous operation and the generation of industrially useful carbon aggregates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed-bed type reaction process is employed for pyrolysis of hydrocarbon, then the catalyst can be easily contained and controlled, but the catalyst is deactivated in a short time due to solid carbon deposition on its surface
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed-bed reactor to a fluidized-bed reactor. In the fluidized-bed system, the catalyst particles are suspended and circulated continuously through the reaction zone and regenerative zone. This dynamic circulation prevents solid carbon accumulation on catalyst surfaces by continuously removing deposited carbon in the regenerative zone, thereby maintaining catalyst activity over extended periods while still providing effective catalyst containment.
2Device complexity
If a fixed-bed reaction process is used, then the system structure is simple, but production efficiency per unit catalyst is poor and continuous operation is difficult
Solution Approach 1:
The patent applies segmentation by dividing the fluidized-bed reactor into distinct functional zones: a reaction zone where hydrocarbon pyrolysis occurs and hydrogen is produced, and a regenerative zone where catalyst regeneration takes place. This segmentation allows different catalyst particles to cycle through different functional stages, enabling continuous hydrogen production while maintaining high catalyst efficiency. The segmented structure facilitates continuous operation by separating the deactivation and regeneration processes in different spatial and temporal domains.
3Productivity
If conventional steam reforming is used for hydrogen production, then hydrogen can be produced efficiently, but a large amount of steam is required resulting in energy loss and CO2 generation
Solution Approach 1:
The patent applies the 'blessing in disguise' principle by converting the harmful by-product (solid carbon) from catalyst deactivation into a useful outcome. Instead of viewing carbon deposition as purely detrimental, the system utilizes the carbon as a fuel source in the regenerative zone, where it reacts with oxygen to produce heat that regenerates the catalyst and generates additional energy. This converts what was previously waste material into a beneficial energy source, reducing overall energy consumption and eliminating CO2 emissions associated with external heating sources.
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 enables environmentally friendly, economically excellent hydrogen production with industrially useful carbon aggregates, maintaining catalyst efficiency and achieving larger particle diameters for carbon materials.
Implementation Method 1
a microwave irradiation section that irradiates the catalyst with a microwave
Implementation Method 2
the catalyst activated by the microwave
Implementation Method 3
The gas supply section supplies the gas at a flow rate at which the filler is fluidized
Implementation Method 4
hydrogen is generated by the hydrocarbon compound being pyrolyzed in the presence of the catalyst
Implementation Method 5
a filler containing a catalyst for pyrolysis of a hydrocarbon
Data Source
AI summary
A hydrogen production device that includes a reactor that includes a filler containing a catalyst for pyrolysis of a hydrocarbon; a gas supply section that supplies gas containing a hydrocarbon compound; and a microwave irradiation section that irradiates the catalyst with a microwave. The gas supply section supplies the gas at a flow rate at which the filler is fluidized, and hydrogen is generated by the hydrocarbon compound being pyrolyzed in the presence of the catalyst activated by the microwave. A carbon aggregate production device includes a reactor that includes a filler containing a catalyst for pyrolysis of a hydrocarbon; a gas supply section that supplies, to the reactor, gas containing a hydrocarbon compound; and a microwave irradiation section that irradiates the catalyst with a microwave. The gas supply section supplies the gas at a flow rate at which the filler is fluidized, and a carbon aggregate is generated by the hydrocarbon compound being pyrolyzed in the presence of the catalyst activated by the microwave.