Engine Reactor Partition Wall Thermal Resistance
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Solution Overview
Problem
Current engine systems fail to efficiently generate sufficient hydrogen gas through dehydrogenation reactions due to heat shortages, leading to increased hydrocarbon CO2 emissions and reactor volume expansion, as well as catalyst deactivation at low temperatures.
Innovation Solution
The engine system incorporates a reactor unit with a catalyst and a hydrogen medium, featuring a partition wall with varying thermal resistance along the exhaust gas passage, allowing for efficient heat recovery and hydrogen production, with a parallel current flow direction and specific materials for heat transfer optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature of exhaust gas supplied to the reactor is raised to improve heat recovery efficiency, then the amount of hydrogen generated increases, but the thermal resistance of the partition wall must be increased to protect the catalyst from low temperature deactivation, which deteriorates heat transfer characteristic and increases reactor volume
Solution Approach 1:
The partition wall is designed with different thermal resistance values at different locations: the upstream side (inlet side) has higher thermal resistance to protect the catalyst from low-temperature deactivation, while the downstream side has lower thermal resistance to improve heat transfer efficiency and reduce reactor volume. This local differentiation resolves the contradiction between catalyst protection and heat transfer efficiency.
2Reliability
If the thermal resistance of the partition wall is increased to protect the catalyst, then the catalyst deactivation is prevented, but the heat transfer characteristic deteriorates and reactor volume increases
Solution Approach 1:
The partition wall implements spatially varying thermal resistance properties: high thermal resistance at the upstream side protects the catalyst from thermal shock and low-temperature deactivation, while low thermal resistance at the downstream side maintains efficient heat transfer, thereby preventing catalyst deactivation without increasing overall reactor volume.
3Productivity
If heat of engine exhaust gas is used for dehydrogenation reaction, then hydrogen is generated from hydrogenation fuel, but the heat shortage increases the amount of additional hydrocarbon required, leading to increased CO2 emissions
Solution Approach 1:
The system optimizes the thermal resistance parameters of the partition wall to maximize heat transfer efficiency from exhaust gas to the hydrogenation fuel. By carefully controlling the thermal resistance distribution, the system extracts maximum heat from the exhaust gas, reducing the need for additional hydrocarbon supplementation and thereby reducing CO2 emissions while maintaining high hydrogen generation efficiency.
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 enhances hydrogen gas production, reduces reactor volume, and prevents catalyst deactivation, improving heat transfer efficiency and hydrogen productivity while minimizing CO2 emissions.
Implementation Method 1
each of said reactors comprises a partition wall disposed between an exhaust gas passage and a hydrogen medium passage; wherein the thermal resistance of said partition wall of said first reactor positioned on the upstream side is larger than that of said second reactor positioned on the downstream side
Implementation Method 2
a reactor unit bearing a catalyst; wherein the hydrogen generated using the heat of the exhaust gas in said reactor unit
Implementation Method 3
hydrogen medium capable of repeating chemically storing and discharging hydrogen; the hydrogen generated using the heat of the exhaust gas in said reactor unit
Data Source
AI summary
An engine system comprising an engine, hydrogen medium capable of repeating chemically storing and discharging hydrogen, an exhaust gas pipe from said engine; and a reactor unit bearing a catalyst;wherein the hydrogen generated using the heat of the exhaust gas in said reactor unit or the mixture of the hydrogen and said hydrogen medium being supplied to said engine;wherein said reactor unit includes at least first reactor and second reactor in said exhaust gas pipe and each of said reactors comprises a partition wall disposed between an exhaust gas passage and a hydrogen medium passage; andwherein the thermal resistance of said partition wall of said first reactor positioned on the upstream side is larger than that of said second reactor positioned on the downstream side, and said hydrogen medium is supplied from said first reactor to said second reactor.