A micro reforming system integrated with a heat-recirculating micro-combustor to produce hydrogen from ammonia
✍ Scribed by J.H. Kim; O.C. Kwon
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 714 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0360-3199
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✦ Synopsis
In order to evaluate the potential of reforming ammonia as a carbon-free fuel in production of hydrogen, a new configuration of a micro reforming system integrated with a microcombustor is studied experimentally. The micro-combustor as a heat source is a simple cylinder with an annular-type shield that applies a heat-recirculation concept. A microreformer to convert ammonia to hydrogen is an annulus, which is effective to transfer heat from the micro-combustor. The annulus-type micro reforming system is designed to produce 1e10 W (based on lower heating value, LHV) of hydrogen using various catalysts.
The feed rate of ammonia, the micro-combustor inlet velocity of fueleair mixtures and the catalyst materials substantially affect the performance of the designed micro reforming system. Under optimized design and operating conditions, the micro reforming system using ruthenium as a catalyst produces 5.4 W (based on LHV) of hydrogen with a conversion rate of 98.0% and an overall system efficiency of 13.7%. Thus, the present configuration can be applied to practical micro reforming systems, supporting the potential of using ammonia as a clean fuel.