Dehydrogenation Reactor Layout for Continuous Hydrogen Output Control
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Solution Overview
Problem
Conventional hydrogen production systems using sodium borohydride (NaBH4) face challenges with reactor size and replacement complexity, especially under high-pressure conditions, and struggle with non-uniform reactions and product solidification, leading to inefficient hydrogen supply and control.
Innovation Solution
A dehydrogenation reaction device with separate units for reactant injection, reaction, and product recovery allows for continuous hydrogen production, independent control of reactant flow, and easy replacement of product storage tanks, using a chemical hydride storage unit with a stabilizer and acid aqueous solution to generate hydrogen, and a recovery unit for efficient product handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reactor size is increased to react more than several kg of SBH for higher hydrogen output, then the hydrogen production capacity is improved, but the reactor becomes heavier and larger causing inconvenient replacement
Solution Approach 1:
The system is divided into a reactor unit and a separate product storage tank. The reactor only needs to handle the reaction of chemical hydride with acid aqueous solution, while the product storage tank stores the generated hydrogen. This segmentation allows the reactor to remain compact while the storage tank can be sized according to hydrogen production requirements.
Solution Approach 2:
The product storage function is extracted from the reactor and placed in a separate tank. This allows the reactor to be optimized for reaction efficiency and compactness, while the storage tank handles the bulk hydrogen storage, solving the problem of reactor weight increasing with production capacity.
2Productivity
If the reactor operates at high pressure to increase hydrogen output, then the hydrogen production efficiency is improved, but the reactor requires thicker material making replacement more difficult
Solution Approach 1:
The system separates the high-pressure reaction zone (reactor) from the storage zone (product storage tank). The reactor can be designed with appropriate pressure ratings for efficient reaction, while the storage tank handles pressure management separately, reducing the overall structural complexity.
Solution Approach 2:
A pressure regulation mechanism acts as an intermediary between the high-pressure reactor and the storage tank. This mediator allows the reactor to operate at high pressure for efficiency while the storage tank receives hydrogen at controlled pressure, reducing the structural demands on both components.
3Reliability
If the product is cooled to room temperature for storage, then the hydrogen can be stored, but the product solidifies and becomes difficult to remove from the reactor
Solution Approach 1:
The product is extracted from the reactor immediately after generation and transferred to a separate storage tank. This prevents the product from solidifying in the reactor, maintaining ease of operation while achieving reliable storage in the dedicated tank.
Solution Approach 2:
The product is transferred to storage before cooling and solidification occur. By performing the transfer action preliminarily, the system avoids the problem of solidified product blocking the reactor, ensuring both storage stability and operational ease.
4Ease of operation
If a separate heat source is used to melt the solidified product for removal, then the product can be removed, but the energy consumption of the system increases
Solution Approach 1:
The product is extracted from the reactor while still in liquid state immediately after reaction, eliminating the need for subsequent melting operations. This prevents energy consumption from heating systems while maintaining product removal capability.
Solution Approach 2:
The product transfer from reactor to storage tank is performed continuously during or immediately after the reaction process, maintaining the product in a removable liquid state throughout the process and eliminating the need for intermittent heating cycles.
5Quantity of substance
If all hydrogen is transferred to a high-pressure buffer tank without restarting the reaction, then the hydrogen supply is complete, but the buffer tank volume must be increased
Solution Approach 1:
The hydrogen storage system is segmented into multiple smaller storage tanks rather than one large buffer tank. This allows hydrogen to be distributed across multiple units, reducing the volume requirement for each individual tank while maintaining total storage capacity.
Solution Approach 2:
The system allows for periodic discharge and replacement of storage tanks. When one tank is full, the reaction can continue charging other tanks, and full tanks can be replaced or discharged separately. This modular approach reduces the total volume needed compared to a single large buffer tank that must hold all hydrogen simultaneously.
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 configuration enables efficient, continuous hydrogen production with reduced system weight and size, immediate output control, and simplified reactor maintenance, addressing the challenges of reactor replacement and reaction uniformity.
Implementation Method 1
a dehydrogenation reactor for generating hydrogen by reacting a chemical hydride with an acid aqueous solution
Data Source
AI summary
A dehydrogenation reaction device is disclosed. The device includes a chemical hydride storage unit including a chemical hydride storage tank, a reaction unit including an acid aqueous solution storage tank, and a dehydrogenation reactor for generating hydrogen by reacting a chemical hydride with an acid aqueous solution. The device further includes a hydrogen storage unit including a hydrogen storage tank for storing the hydrogen produced in the dehydrogenation reactor, and a recovery unit for recovering the product produced in the dehydrogenation reactor.