Pressurized Reformer-SOFC Integration for Low-Heat Fuel Power
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Solution Overview
Problem
Current methods for converting fossil or bio-fuels to hydrogen are inefficient, requiring significant heat input, multiple processing steps for CO2 separation and hydrogen purification, and result in low overall efficiency, leading to increased CO2 emissions that need to be sequestered.
Innovation Solution
A method involving a pressurized steam reformer that converts a liquid fuel composition of hydrocarbons and water into a reformate composition containing hydrogen and methane, which is then directly introduced into a solid oxide fuel cell (SOFC) for electricity generation, achieving a synergy that maximizes thermodynamic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If steam reforming is used to convert liquid fuels to hydrogen, then hydrogen production is achieved, but considerable heat must be supplied reducing efficiency
Solution Approach 1:
The patent combines the steam reforming process with a solid oxide fuel cell (SOFC) into an integrated system where the reformer and fuel cell operate together. The SOFC generates electricity while the reformer converts liquid fuel to hydrogen, and their thermal and mass flows are coupled to improve overall efficiency.
Solution Approach 2:
The patent operates the reforming process at elevated pressures (e.g., 30-100 atm) rather than atmospheric pressure. This pressure increase shifts the reforming equilibrium and reduces the endothermic heat requirement, thereby improving energy efficiency while maintaining hydrogen production.
2Quantity of substance
If air is used in autothermal reforming to obtain CO2-rich exhaust for sequestration, then CO2 concentration is improved, but substantial nitrogen dilution occurs
Solution Approach 1:
The patent extracts and removes nitrogen from the system by using pure oxygen instead of air for the reforming process. This eliminates nitrogen dilution of the CO2 exhaust stream, producing a concentrated CO2 stream suitable for sequestration without the need for nitrogen removal.
Solution Approach 2:
The patent creates an inert oxygen-rich environment for reforming instead of using air. By substituting air with pure oxygen, the harmful nitrogen component is eliminated, allowing CO2 to be produced in a concentrated form without dilution.
3Reliability
If hydrogen purification processes are implemented to reduce CO to ppm levels, then PEMFC catalyst poisoning is prevented, but at least two process steps including water-gas shift reactor are required
Solution Approach 1:
The patent extracts and removes CO from the reformate stream by utilizing the SOFC anode, where CO is oxidized to CO2 in the electrochemical reaction. This eliminates the need for separate water-gas shift reactors and CO removal units required in conventional hydrogen purification systems.
Solution Approach 2:
The patent replaces mechanical/chemical purification systems (water-gas shift reactors, CO removal units) with an electrochemical system (SOFC). The fuel cell anode electrochemically converts CO to CO2, providing purification through electrochemical reactions rather than sequential chemical processing steps.
4Temperature
If additional fuel is combusted with air to provide heat for reforming, then reforming heat is supplied, but a separate exhaust stream containing CO2 heavily diluted with nitrogen is produced
Solution Approach 1:
The patent merges the heat supply function with the electricity generation function by using the SOFC to provide both thermal energy for reforming and electrical power. The SOFC operates as a combined heat and power unit, eliminating the need for separate combustion processes that would produce nitrogen-diluted CO2 exhaust.
Solution Approach 2:
The patent uses pure oxygen to create an inert combustion environment for providing reforming heat, replacing air-based combustion. This prevents nitrogen from entering the system and diluting the CO2 exhaust, allowing concentrated CO2 to be produced while maintaining necessary thermal conditions.
5Ease of operation
If hydrogen is compressed or liquefied for transport and storage, then hydrogen distribution is enabled, but both processes are energy intensive
Solution Approach 1:
The patent changes the operating pressure parameter to high pressure (30-100 atm) throughout the system, allowing hydrogen to be produced and utilized directly in compressed form without requiring additional compression or liquefaction steps. This high-pressure operation enables direct pipeline transport and storage.
Solution Approach 2:
The patent creates a continuous system where hydrogen is produced by reforming and immediately consumed by the SOFC without interruption for compression or liquefaction. The integrated reformer-SOFC system maintains continuous operation, eliminating discrete energy-intensive processing steps for hydrogen conditioning.
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 achieves a high thermodynamic efficiency of nearly 90% by reducing the enthalpy of the reforming reaction and eliminating the need for additional heat and complex processing steps, resulting in a more efficient conversion of fuels to electricity compared to traditional methods.
Implementation Method 1
a reformer under a pressure and at an elevated temperature to convert the liquid fuel composition to a reformate composition via a reforming reaction
Implementation Method 2
a solid oxide fuel cell under conditions sufficient to convert the reformate composition into an exhaust composition while generating electricity
Data Source
AI summary
The present disclosure provides methods for generating electricity. In embodiments, a method for generating electricity comprises injecting a liquid fuel composition comprising a hydrocarbon and water into a reformer, the reformer under a pressure and at an elevated temperature to convert the liquid fuel composition to a reformate composition via a reforming reaction, the reformate composition comprising hydrogen and methane; and introducing the reformate composition into an anode inlet port of a solid oxide fuel cell in fluid communication with the reformer while introducing oxygen into a cathode inlet port of the solid oxide fuel cell under conditions to convert the reformate composition into an exhaust composition while generating electricity. Systems for carrying out the methods are also provided.