Abstract
Hydrogen as an alternative fuel has some problems, which include a little practical infrastructure, low volumetric energy density, explosion risk and high energy cost. In order to minimize those problems, ammonia is considered as a hydrogen career fuel. Urea is also considered as a hydrogen career for handling, safety and energy recycle, but ammonia contains such disadvantages as fossil fuel involvement in production process, high production energy cost and toxicity. In the previous paper, it was showed that the urea energy recycle system which collects ammonia or urea from human body, livestock, sewer and waste plastics converts them to hydrogen, and the co-generation system which generates electricity, hot water and cooling systems were discussed. In this paper, the authors would discuss an optimization method for conversion of urea to hydrogen fuel and experiments in a laboratory to prove the feasibility. Moreover they would like to discuss advantages and disadvantages and practical execution (method, location etc.) in the urea energy recycle system, and propose one of the possibilities in the diversity of alternative energies.
