There are two methods to use hydrogen as a power generator, one is a fuel cell and other is an internal combustion engine [1,2]. We focused on the utilization of hydrogen with internal combustion engine because of the following reasons. One is the lower cost associated with the availability of existing engine components and technology for combustion control. The other advantage is that internal combustion engine can use directly any purity of hydrogen, produced by various methods, such as water electrolysis, reforming of hydrocarbons, dehydrogenation of the chemical hydrides [3] and so on. Figure 1 is an image of the hydrogen/diesel dual fuel engine, combined with various hydrogen production methods. If we use hydrogen internal combustion engine as the power source of generator and heat source of cogeneration system, the total thermal efficiency that combines power and heat utilization efficiency, is about 80%. In addition, internal combustion engines for the generator, meeting various size and power demands, have already been widely prevalent. If hydrogerr is applied to engines for the generator that have already been installed, there is possibility that can reduce CO2 or other chemical species, derived from carbon present in fossil fuels.
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