Hydrogen Generator Catalyst Purge Temperature Control
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Solution Overview
Problem
Conventional hydrogen generators using nickel-containing reforming catalysts face performance degradation due to the discharge of nickel compounds when the reformed gas is purged at low temperatures, leading to a reduction in catalyst efficiency.
Innovation Solution
A hydrogen generator configuration that includes a temperature detector and a purge gas supply system, which purges the reformer when the catalyst temperature reaches a predetermined level, preventing the formation and discharge of nickel-carbon monoxide compounds and thus maintaining catalyst performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the reformed gas is purged after the temperature in the reformer is lowered up to a low temperature (e.g., 100°C), then the purge operation can be performed, but the compound of nickel and carbon monoxide is discharged together with the reformed gas, causing performance degradation of the reforming catalyst
Solution Approach 1:
The patent changes the temperature parameter at which purging is performed. Instead of purging at low temperatures (e.g., 100°C), the system purges when the temperature is 150°C or higher. This parameter change prevents the formation and discharge of nickel-carbon monoxide compounds while still achieving effective purging of the reformer.
2Reliability
If the temperature of the reformer is maintained at 600°C or higher to prevent carbon deposition, then stable steam reforming is carried out, but the cost of energy consumption increases
Solution Approach 1:
The patent applies preliminary action by performing purging operations at appropriate temperatures (150°C or higher) before carbon deposition problems occur. This prevents the need for continuous high-temperature maintenance solely for carbon deposition prevention, allowing the system to operate at lower temperatures (60-200°C) during normal hydrogen generation while maintaining stability.
3Ease of manufacture
If the reforming catalyst contains nickel to reduce cost, then the cost of the reforming catalyst is reduced, but nickel is discharged to the outside of the hydrogen generator when purged at low temperature, causing performance degradation
Solution Approach 1:
The patent changes the temperature parameter for purging from low temperature (e.g., 100°C) to a higher temperature (150°C or higher). This parameter change prevents nickel loss while maintaining the use of cost-effective nickel-containing catalysts, thereby achieving both cost reduction and preventing substance loss.
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 system effectively suppresses performance deterioration of the nickel-containing reforming catalyst by purging the reformer at an optimal temperature, preventing nickel loss and maintaining catalyst efficiency.
Implementation Method 1
a reformer configured to generate a hydrogen-rich fuel gas by using a raw material and water, with a reforming catalyst containing nickel
Implementation Method 2
a burner configured to heat the reformer; the temperature of a catalyst of the reformer is increased to and maintained at 600° C. or higher by combustion of the burner
Implementation Method 3
a temperature detector configured to detect a temperature of the reforming catalyst
Implementation Method 4
a purge gas supplying device configured to supply a purge gas to the reformer; the controller purges the reformer with the purge gas supplied from the purge gas supplying device
Data Source
AI summary
A hydrogen generator of the present invention includes: a reformer (1) including a reforming catalyst (1A) containing nickel and configured to generate a hydrogen-rich fuel gas by using a raw material and steam; a temperature detector (12) configured to detect a temperature of the reforming catalyst (1A); a purge gas supplying device (7) configured to supply a purge gas to the reformer (1); and a controller (13). When the temperature detected by the temperature detector (12) is a first predetermined temperature or higher, the controller (13) purges the reformer (1) with the purge gas supplied from the purge gas supplying device (7).