Microwave Plasma Hydrogen Generator with Segmented Sources
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Solution Overview
Problem
Current hydrogen production methods, such as catalytic cracking of hydrocarbons and electrolysis, result in high environmental impact due to energy consumption and greenhouse gas emissions, and existing microwave plasma systems are limited in scale and efficiency for commercial hydrogen production.
Innovation Solution
A system utilizing microwave-generated plasma nozzles with a non-resonant reaction chamber, allowing for the generation of high volumes of plasma at atmospheric pressure, with electromagnetic isolation of plasma sources and stabilizing flow patterns to sustain plasma and facilitate continuous hydrogen production without oxides of carbon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microwave plasma sources are used for hydrogen production, then processing efficiency and reaction rate are improved, but scaling up to commercial volume is limited by device size and plasma volume constraints
Solution Approach 1:
The system divides the plasma generation into multiple independent microwave plasma sources (first plasma source, second plasma source, etc.) that operate separately and feed into a common reaction chamber. Each plasma source can be independently controlled and scaled, allowing the total plasma volume to be increased by adding more sources rather than enlarging a single source.
Solution Approach 2:
The invention transitions from a single-volume plasma constraint to a multi-source spatial arrangement where multiple plasma sources are distributed around the reaction chamber. This spatial distribution in multiple dimensions allows the system to achieve large effective plasma volume without requiring any single plasma source to be excessively large, thereby enabling commercial-scale hydrogen production.
2Volume of stationary object
If multiple plasma sources are combined to increase plasma volume, then hydrogen production capacity is improved, but electromagnetic interference between sources increases
Solution Approach 1:
The invention extracts the electromagnetic field generation function from the plasma chemistry function by using waveguides to deliver microwave energy from external magnetron sources to the plasma generation zones. This separation allows independent optimization of the electromagnetic sources and the plasma chemistry processes, reducing interference between multiple plasma sources while maintaining their individual effectiveness.
Solution Approach 2:
Waveguides serve as intermediary elements that channel microwave energy from multiple magnetron sources to their respective plasma generation zones without the sources directly interacting. The waveguides isolate the electromagnetic fields of individual sources, preventing harmful interference while still allowing the plasma products to combine in the reaction chamber for enhanced hydrogen production.
3Productivity
If plasma residency time is extended to improve reaction completeness, then hydrogen conversion efficiency is improved, but energy consumption and system complexity increase
Solution Approach 1:
The reaction process is segmented into distinct zones: plasma generation zones where ionization occurs, and a separate reaction chamber where the plasma products continue to react. This segmentation allows the plasma to be generated efficiently in localized zones and then allowed to react for extended periods in the reaction chamber without requiring continuous high-energy plasma maintenance, thereby reducing overall energy consumption while improving conversion efficiency.
Solution Approach 2:
The microwave plasma sources perform preliminary action by ionizing the feedstock and creating reactive plasma species before the material enters the reaction chamber. This preliminary plasma treatment initiates the cracking and reforming reactions, allowing the subsequent reaction phase to proceed more efficiently with lower continuous energy input, thus improving overall conversion efficiency while managing energy consumption.
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
Enables efficient, scalable, and continuous hydrogen production with reduced environmental impact by generating higher volumes of plasma and allowing for additive plasma sources, improving processing efficiency and flexibility in reaction conditions.
Implementation Method 1
each plasma nozzle comprising a microwave plasma generator (301, 302) and a feed tube (303) for directing a flow of the gaseous hydrocarbon via the plasma generator to respective inlets to the reaction chamber, whereby the microwave plasma generator is suitable for at least partly ionising the gaseous hydrocarbon to form a plasma
Implementation Method 2
the microwave plasma generator is suitable for at least partly ionising the gaseous hydrocarbon to form a plasma prior to entry of the at least partly ionised hydrocarbon into the reaction chamber
Implementation Method 3
Hydrogen for example is currently synthesised by the catalytic cracking of hydrocarbon molecules
Implementation Method 4
the high temperatures required for this reaction to take place are achieved usually by burning oil or coal
Implementation Method 5
The pre-processing module (2) comprises means for pre-heating the gaseous hydrocarbon
Implementation Method 6
the process of generating hydrogen by electrolysis of water consumes more energy than is stored in the produced hydrogen
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
An apparatus, a system and a method for producing hydrogen from gaseous hydrocarbon comprises a gas pre-treatment module (2) fluidly connected to a gas reservoir (66) and to at least one hydrogen generator (100); and a hydrogen post- processing module (3) fluidly connected via a feeding conduit (81) to the generator and to a storage and distribution module (5). The hydrogen generator comprises plasma nozzles (105); a reaction chamber (102) coupled to each of the plasma nozzles; each plasma nozzle comprising a microwave plasma generator (301, 302) and a feed tube (303) for directing a flow of the gaseous hydrocarbon via the plasma generator to respective inlets to the reaction chamber, whereby the plasma generator at least partly ionises gaseous hydrocarbon to form a plasma prior to entry of the at least partly ionised hydrocarbon into the reaction chamber, and the reaction chamber comprises at least one outlet (101) via which hydrogen is conveyed to the post-processing module (3).