Hydrogen Generator Heat Insulation for Catalyst Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing hydrogen generation apparatus faces issues with thermal deformation and reduced durability due to excessive heat transfer, leading to potential leaks and system shutdowns when the reforming catalyst amount is reduced for cost and size considerations.
Innovation Solution
Incorporating a heat transfer suppressing unit, such as ceramic fiber heat insulation material, to prevent unnecessary heating of the reforming catalyst downstream portion, thereby maintaining a consistent temperature and preventing thermal deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the amount of reforming catalyst is reduced to decrease cost and size, then the device complexity and cost are reduced, but the downstream portion of the reforming catalyst is excessively heated due to heat transfer from combustion exhaust gas, causing thermal deformation and reduced durability
Solution Approach 1:
A heat insulation material is introduced as an intermediary substance between the combustion exhaust gas and the downstream portion of the reforming catalyst. This heat insulation material blocks excessive heat transfer from the combustion exhaust gas to the reforming catalyst downstream portion, preventing thermal deformation and maintaining durability while allowing the use of reduced catalyst amounts.
Solution Approach 2:
The heat insulation material serves as a protective layer that enables the use of less expensive and smaller reforming catalyst while maintaining system reliability. By adding this insulating layer, the system can operate with reduced catalyst quantities without suffering from the thermal deformation problems that would otherwise occur.
2Ease of manufacture
If the amount of reforming catalyst is reduced for cost considerations, then the manufacturing cost decreases, but the thermal management of the downstream portion becomes problematic leading to excessive heating
Solution Approach 1:
The heat insulation material acts as a thermal barrier that mediates between the hot combustion exhaust gas and the reforming catalyst downstream portion. This intermediary layer reduces the temperature rise in the catalyst downstream portion, enabling cost-effective manufacturing with reduced catalyst amounts while maintaining acceptable thermal conditions.
3Use of energy by moving object
If heat transfer from combustion exhaust gas is allowed to proceed normally, then the reforming catalyst is heated for the reforming reaction, but the downstream portion becomes excessively heated causing thermal deformation
Solution Approach 1:
The heat insulation material is selectively applied to the downstream portion of the reforming catalyst, creating a localized thermal management solution. This allows the upstream portion to receive sufficient heat from combustion exhaust gas for the reforming reaction, while the downstream portion is protected from excessive heating that would cause thermal deformation.
Solution Approach 2:
The heat insulation material serves as a protective intermediary that blocks harmful excessive heat transfer to the downstream portion while allowing the necessary heat transfer to occur at the upstream portion for maintaining the reforming reaction.
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 allows for a reduction in the expensive reforming catalyst amount without compromising durability or hydrogen generation efficiency, ensuring a stable fuel cell system operation by maintaining the conversion ratio and preventing temperature-related issues.
Implementation Method 1
a heat transfer suppressing unit, such as ceramic fiber heat insulation material, to prevent unnecessary heating of the reforming catalyst downstream portion
Implementation Method 2
generates a hydrogen-containing gas through a reforming reaction between a raw material gas and water vapor by using a reforming catalyst
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Provided is hydrogen generation apparatus (1) including heating unit (2), a first gas flow path in which reforming catalyst section (20) is disposed and in which a raw material gas flows into reforming catalyst section (20) and a reformed gas flows out from reforming catalyst section (20), a second gas flow path through which a heated gas that is heated by heating unit (2) flows, and a wall that partitions the first gas flow path and the second gas flow path. In addition, reforming catalyst section (20) is heated by using heat, which is transferred through the wall, of the heated gas. Furthermore, hydrogen generation apparatus (1) includes a heat transfer suppressing unit that suppresses heat transfer from the heated gas to reforming catalyst downstream portion (20a) including a downstream-side end of reforming catalyst section (20) in a flow direction of the reformed gas.