Endothermic Reaction Unit with Nested Combustion Chambers
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Solution Overview
Problem
Existing endothermic reaction units for hydrocarbon reforming, such as methane steam reforming, face inefficiencies in thermal energy transfer from combustion to catalysts, leading to suboptimal heating and increased energy costs.
Innovation Solution
A dual combustion chamber design where a first combustion chamber is housed inside a second combustion chamber, with reaction elements thermally connected to the first chamber for conduction heating and benefiting from secondary combustion in the second chamber, enhancing heat transfer through conduction and convection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If combustion means are positioned separately from reaction elements, then device structure is simplified, but thermal energy transfer efficiency deteriorates
Solution Approach 1:
The first combustion chamber is nested inside the second combustion chamber, and reaction elements are positioned within the annular space between the two chambers. This nested arrangement allows combustion products from both chambers to directly contact the reaction elements, maximizing thermal energy transfer while maintaining a compact structure.
Solution Approach 2:
The patent combines primary and secondary combustion chambers into a single integrated structure, with both combustion processes occurring in close proximity to the reaction elements. This merging of combustion stages eliminates the need for separate heating systems and improves overall thermal efficiency.
2Productivity
If combustion chamber is positioned to supply thermal energy to reaction elements, then heating efficiency is improved, but device complexity increases
Solution Approach 1:
The first combustion chamber is placed inside the second combustion chamber, creating a compact nested structure that maximizes heating efficiency while minimizing the overall device footprint and structural complexity.
Solution Approach 2:
The reaction elements are positioned in the annular space between the two combustion chambers, allowing them to receive thermal energy from both primary and secondary combustion processes simultaneously. This local positioning optimizes heat distribution to where it is most needed.
3Temperature
If dual combustion chambers are used for enhanced heating, then thermal performance is improved, but device complexity increases
Solution Approach 1:
The nested arrangement of two combustion chambers allows the system to achieve high thermal performance through dual combustion processes while maintaining a compact structure that does not linearly increase device complexity.
Solution Approach 2:
The first combustion chamber serves dual purposes: providing thermal energy directly to the reaction elements and preheating combustion air for the second combustion chamber. This multi-functionality reduces the need for separate heating 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 design optimizes the heating of reaction elements, reducing energy costs and improving thermal performance by stabilizing combustion and uniformly distributing heat to the reaction elements, resulting in a more efficient endothermic reaction unit.
Implementation Method 1
at least one reaction element comprising a housing body made of metal material through which a reaction mixture is destined to pass. Said at least one reaction element is housed at least partly inside the second combustion chamber and is thermally connected to the first combustion chamber so that at least part of the heat generated inside the first combustion chamber is transferred by conduction to said at least one reaction element.
Implementation Method 2
a first combustion chamber made of metal material, inside which a first combustion stage is produced and a second combustion chamber defining a second combustion stage
Data Source
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AI summary
The present invention relates to an endothermic reaction unit to be used, preferably but not exclusively, in catalytic reforming processes of hydrocarbons, such as a methane steam reforming process. The reaction unit according to the invention comprises a first combustion chamber made of metal material, inside which a first combustion stage is produced and a second combustion chamber defining a second combustion stage. The first combustion chamber is housed at least partly inside the second combustion chamber. The reaction unit comprises one or more reaction elements each comprising a housing body through which a reaction mixture is destined to pass. These reaction elements are housed at least partly inside the second combustion chamber and are thermally connected to the first combustion chamber so that at least part of the heat generated inside the first combustion chamber is transferred by conduction to these reaction elements.