Hydrogen Reforming Device with Nested Heat Exchange Zones
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Solution Overview
Problem
Existing hydrogen generation devices face inefficiencies due to heat losses and thermomechanical challenges from multiple chambers and fluid connections, which reduce hydrogen yield and increase mechanical stress.
Innovation Solution
A reforming device with a reaction chamber surrounded by two cylindrical zones for heat recovery and preheating, minimizing external heat losses and thermomechanical stress by integrating multiple steps into a single chamber, using a configuration that allows for efficient heat exchange and reduced fluid connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple chambers and fluid connections are used for preheating and heat exchange, then heat recovery is improved, but device complexity and thermomechanical stress increase
Solution Approach 1:
The patent combines multiple functional chambers (reaction chamber, preheating chamber, heat exchange chamber) into a single integrated chamber with radial zones. The reaction chamber is surrounded by a first cylindrical zone for preheating, which is in turn surrounded by a second cylindrical zone for heat exchange, eliminating the need for separate chambers and reducing device complexity while maintaining heat recovery efficiency
Solution Approach 2:
The patent implements a nested structure where the first cylindrical zone is surrounded by the second cylindrical zone, both concentric to the reaction chamber. This nested arrangement allows multiple heat exchange functions to be performed within a compact volume, reducing the overall device volume and complexity while improving heat recovery
2Loss of energy
If multiple chambers and fluid connections are used for preheating and heat exchange, then heat recovery is improved, but mechanical stress and reliability issues increase
Solution Approach 1:
By merging multiple chambers into a single integrated chamber with radial zones, the patent eliminates numerous fluid connections and joints between chambers. This reduces the number of potential failure points and decreases thermomechanical stress concentration at connections, thereby improving reliability while maintaining effective heat recovery
Solution Approach 2:
The patent segments the single chamber into functional radial zones (reaction chamber, first cylindrical zone for preheating, second cylindrical zone for heat exchange) separated by partition walls. This segmentation allows different temperature zones to be managed independently while maintaining a unified structure with fewer connections, improving both heat recovery and reliability
3Temperature
If a fraction of hydrocarbon is burned for heat provision, then reforming reaction heat is improved, but hydrogen yield decreases
Solution Approach 1:
The patent employs self-service heat recovery where the exothermic combustion of a small fraction of hydrocarbon automatically preheats the incoming hydrocarbon and water feeds through the integrated heat exchange zones. This eliminates the need for external heat sources, reduces the burned hydrocarbon fraction to a minimum, and maximizes hydrogen yield while maintaining adequate reaction temperature
Solution Approach 2:
The patent changes the temperature parameters of the incoming hydrocarbon and water feeds by preheating them in the integrated heat exchange zones before entering the reaction chamber. This allows the reforming reaction to proceed at lower temperatures with less combustion, thereby increasing hydrogen yield while maintaining adequate reaction conditions
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 device optimizes energy yield by minimizing heat losses and mechanical stress, enhancing the reliability and longevity of the hydrogen generation process while reducing the device's volume and complexity.
Implementation Method 1
a reaction chamber into which the reactive fluids are introduced to perform a reforming reaction, which produces hydrogen and carbon oxides from the reagents, this reaction being carried out at high temperature
Implementation Method 2
a first, more or less cylindrical zone surrounding the reaction chamber and in which circulates a mixture of water vapor or hydrocarbon to be introduced into the reaction chamber, to the exclusion of the products of the reaction, this zone being separated from the reaction chamber in order to recover, at least in part, the heat lost by the reaction chamber, so as to preheat the mixture circulating in the first zone
Implementation Method 3
the reagent or reagents being in direct contact with the walls of this first zone to carry out heat exchanges
Implementation Method 4
a second, more or less cylindrical zone surrounding the first zone and in which circulates water in order to preheat it and vaporize it, the water being in direct contact with the walls of this second zone, the separation between the first and second zones being such that the water circulating in the second zone recovers the heat lost by the first zone
Implementation Method 5
a second, more or less cylindrical zone surrounding the first zone and in which circulates water in order to preheat it and vaporize it
Data Source
AI summary
A device generating hydrogen from a hydrocarbon, oxygen and water. The reaction is carried out at high temperature. The device includes a first substantially cylindrical zone surrounding the reaction chamber circulates water vapor and hydrocarbon, excluding the reaction products, the zone being separated from the reaction chamber to recover heat lost by the reaction chamber, to preheat the mixture circulating in the first zone. The reagent(s) are in contact with the walls of said first zone to exchange produce heat. A substantially cylindrical second zone surrounds the first zone and circulates water to be vaporized, the water is in contact with the walls of said second zone. The first and second zones are separated such that water circulating in the second zone is preheated by heat of the first zone where the water of the second zone is mixed with the hydrocarbon and introduced into the first zone.