2002 Volume 64 Issue 1 Pages 61-69
This paper was carried out to promote the complete combustion of methane, which was pointed out in Part 1. In order to investigate the combustion process, combustion pressure, combustion temperature and heat release were analyzed precisely under the various load and supplying biogas amount. From the experimental results it was observed that the combustion pressure and rate of the pressure raise decreased in accordance with the supplying biogas amount. The combustion duration time became, because of the slower combustion process, also the longest. On the contrary, the combustion pressure and the heat release were increased in higher load region. As a result, unburned methane started to burn again in the exhaust pipe and the burning efficiency was slightly increased. This was also observed from the results of the exhaust gas analysis. On the basis of combustion characteristics of duel fueled CGS, it was suggested that several methods for the complete combustion of methane at lower load. Such methods are consisted of the intake air heating, supercharging and exhaust gas re-circulation (EGR).
