In Japan, we depend on the import from foreign countries for most in the primary energy resources. From the viewpoints of the stable supply of energy and the global environmental protection during the future, it can be said that highly effective usages of waste matter as the recycling type energy resource and unused resources of low-rank coal, extra heavy oil, and oil shale are the most crucial issue. For example, the electric power plants are set up in the incineration processing of around 60 percent of the wastes, but the thermal efficiency is around 10 percent on the average. This is as low as around one fourth to one fifth of that of the latest power plant. When introducing the high-efficiency electric power plant into heat recovery processing of concerned waste incinerators, the electric power of around 34.7 billion kilowatt-hour is generated and it indeed corresponds to around 4 percent a year of the power demand of the electric power industry or one second of the amounts of hydraulic power plant. If the latest ones were introduced into all municipal solid waste, indeed 7 percent of all power demand should be covered. It is possible to contribute to energy conservation and the global environmental safeguards greatly. Development of the integrated gasification combined cycle (IGCC) power generation of various gasifying methods has been preceded in the world, and this technology enables high-efficiency generation of waste matter and each unused resource. This paper outlines the each combustion technology of high temperature gas turbine for the IGCC developed in the world as one of the high-efficiency power generation systems those could be applied to the gasification melting furnace technologies of solid waste and each unused resource, and BFG (blast furnace gas) fired gas turbine.
In this research, flame-spread characteristics of randomly-arranged one-dimensional fuel-droplet arrays in microgravity were studied. Flame-spread probability was calculated based on a percolation model with the flame-spread-limit distance with evenly spaced droplet arrays. Flame-spread probability depends on occupation fraction of droplet in lattice, and rapidly increases with the occupation fraction. Local flame-spread-limit distance of droplet array with uneven inter-droplet distance was investigated. Flame-spread experiments were performed in microgravity. The fuel droplets were hung on the fibers, and the fuel droplets were arranged in a straight line at uneven inter-droplet distance. N-decane was used as a fuel. Local flame-spread-limit distance of unevenly-spaced droplet array is affected by local droplet interaction and flame spread mode and is larger than that of evenly-spaced droplet array. Flame-spread probability considering the flame-spread-limit distance with uneven inter-droplet distance is larger than that without it.
Three dimensional combustion simulation tools with the flame propagation model Universal Coherent Flamelet Model (UCFM) has been applied to SI lean burn combustion to study the influence of equivalence ratio on the amount of unburned fuel. Unburned HCs from piston-cylinder crevices were taken into consideration by using a calculation grid incorporating the actual crevice volume and shape. The oxidation of unburnt fuel from crevice volume and wall quench was enabled to be predicted by applying an autoignition model to post-flame phenomena. The calculation results show the general tendencies for the total amount of unburned HCs and their distribution in the combustion chamber.