Multi-tubular Hydrogen Generator with Radial Catalyst Zones
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Solution Overview
Problem
Current methods for storing and utilizing hydrogen, such as high-pressure tanks and hydrogen storage alloys, are not commercially feasible due to high capital investment and poor hydrogen storage capacity, and the efficiency of hydrogenation and dehydrogenation reactions between organic hydrides needs improvement.
Innovation Solution
A hydrogen generator with a multi-tubular reactor vessel structure that directly transmits energy from a combustion catalyst to a dehydrogenation catalyst, supported on a high thermal conductivity surface, such as aluminum oxide, to enhance energy utilization and hydrogen generation efficiency, and a hydrogenation apparatus with a similar structure to control reaction temperature and boost hydrogenation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-tubular reactor structure with direct energy transmission is used, then energy utilization efficiency and hydrogen generation rate improve, but device complexity increases
Solution Approach 1:
The reactor is divided into multiple tubular sections with distinct functions: an inner combustion chamber for heat generation and outer annular zones for dehydrogenation reactions. This segmentation allows independent optimization of combustion and dehydrogenation processes while enabling direct thermal coupling through the reactor wall, thereby achieving high hydrogen generation rates without requiring complex external heating systems.
Solution Approach 2:
The invention merges the combustion chamber and dehydrogenation reactor into a single integrated multi-tubular structure where the combustion chamber is positioned concentrically within the dehydrogenation zones. This merging eliminates the need for separate external heating apparatus and directly transmits combustion heat to the dehydrogenation catalyst through the reactor wall, significantly improving energy utilization efficiency and hydrogen generation rate.
2Loss of energy
If high thermal conductivity catalyst support is used, then heat transmission efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The invention changes the thermal conductivity parameter of the catalyst support material by selecting materials with high thermal conductivity properties. This parameter change enables efficient heat transmission from the combustion chamber to the dehydrogenation catalyst, ensuring that thermal energy is effectively utilized for hydrogen generation while maintaining structural integrity under high-temperature conditions.
Solution Approach 2:
The high thermal conductivity catalyst support acts as an intermediary medium that facilitates heat transfer from the combustion chamber wall to the dehydrogenation catalyst. This intermediary structure enables direct thermal coupling without requiring complex external heating systems, thereby improving energy utilization efficiency while maintaining manufacturing feasibility through the use of conventional high-conductivity materials.
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
The solution significantly improves the efficiency of dehydrogenation and hydrogenation reactions, leading to a higher hydrogen generation rate and overall energy efficiency, making hydrogen storage and utilization more commercially viable.
Implementation Method 1
a region for supplying fuel to generate heat necessary for dehydrogenation, the region containing a combustion catalyst for combusting fuel
Implementation Method 2
a region containing a dehydrogenation catalyst necessary for dehydrogenation
Implementation Method 3
directly transmits the energy generated by combusting fuel to the dehydrogenation catalyst in the region other than the region containing the combustion catalyst
Data Source
Figure 1
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Figure 4
AI summary
The efficiency of dehydrogenation and that of hydrogenation are improved. A hydrogen generator for generating hydrogen by dehydrogenation of organic hydrides in the presence of a catalyst is characterized by comprising a reactor vessel (10) of a multi-tubular structure having a region (12) for supplying fuel to generate heat necessary for dehydrogenation, the region containing a combustion catalyst for combusting fuel, and a region (11) containing a dehydrogenation catalyst necessary for dehydrogenation, the regions being arranged radially side by side with a wall separating them. A hydrogenation apparatus which synthesizes organic hydrides by way of hydrogenation of unsaturated hydrocarbons in the presence of a catalyst is characterized by comprising a reactor vessel (10) of a multi-tubular structure having a region (12) for removing the heat generated by hydrogenation and a region (11) containing a hydrogenation catalyst necessary for hydrogenation, the regions being arranged radially side by side with a wall separating them.