Hydrogen Generation System Bayonet Flow Path Heat Recovery
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Solution Overview
Problem
Current hydrogen generation systems from hydrocarbons face inefficiencies and high emissions due to the lack of effective heat recovery and utilization in steam methane reforming and water gas shift reactions.
Innovation Solution
The system incorporates a steam methane reactor with a bayonet flow path and catalytic foam for heat transfer, coupled with a water gas shift reactor using heat transfer materials to facilitate energy-efficient hydrogen production by recycling heat between fluid streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional hydrogen generation systems are used without heat recovery, then the process is simpler to operate, but energy efficiency is low and emissions are high
Solution Approach 1:
The patent combines the steam methane reformer and water gas shift reactor into an integrated system where the product stream from the SMR is directly fed to the WGS reactor. This merging allows heat recovery from the WGS exothermic reaction to be used for preheating the SMR endothermic reaction feed, improving energy efficiency while maintaining operational simplicity through a unified design.
Solution Approach 2:
The patent introduces a heat exchanger as an intermediary component between the WGS reactor and SMR. The heat exchanger mediates heat transfer from the hot WGS product stream to the cooler SMR feed stream, enabling energy recovery without direct thermal coupling between the reactors, thus maintaining operational independence while improving energy efficiency.
2Temperature
If heat transfer materials are added to the WGS reaction channel, then heat removal from exothermic reaction is improved, but the device complexity increases
Solution Approach 1:
The patent employs a porous heat transfer material packed within the WGS reaction channel. This porous material provides large surface area for heat exchange between the reacting gas stream and the cooling fluid, enabling effective heat removal from the exothermic WGS reaction. The porous structure achieves superior temperature control without requiring complex external heat exchange equipment.
Solution Approach 2:
The patent nests the heat transfer material inside the WGS reaction channel, creating a concentric arrangement where the cooling fluid flows through the porous material while the reaction occurs in the central channel. This nested configuration enables integrated heat removal and reaction in a single reactor vessel, improving temperature control without adding separate cooling systems.
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 energy-efficient, low-emission hydrogen production by optimizing heat transfer and reducing the external heat load, making the process modular and scalable for large-scale applications.
Implementation Method 1
Catalytic foam and heat transfer foam disposed along the bayonet flow path catalyze a hydrogen generation reaction in the SMR and facilitate heat transfer to the incoming reactant fluid
Implementation Method 2
incoming reactant fluid flowing along the flow path is heated by transfer of recovered heat from outgoing fluid flowing along the flow path
Implementation Method 3
The fluid flows across one or more WGS catalysts and one or more heat transfer materials disposed along a reaction channel in the WGS reactor. The WGS catalysts and heat transfer material catalyze a hydrogen generation reaction in the WGS
Implementation Method 4
facilitate removal of heat generated by the exothermic WGS hydrogen generation reaction
Implementation Method 5
Cooling fluid heated by heat from the WGS hydrogen generation reaction can be provided as input into the SMR
Data Source
AI summary
A method for producing hydrogen includes flowing a first gas along a bayonet flow path of a steam methane reformer (SMR) to produce a first product, including flowing the first gas through a foam disposed along the bayonet flow path; providing the first product produced in the SMR to an input of a water gas shift (WGS) reaction channel defined within a reaction tube of a WGS reactor; and flowing a second gas including the first product through the WGS reaction channel to produce a second product. Flowing the second gas includes flowing the second gas across a heat transfer material disposed in the WGS reaction channel to reduce the temperature of the flowing second gas; and flowing the second gas across a WGS catalyst disposed in the reaction channel.