For the original methods to do away with various kinds of solid wastes, there are ocean speculation, land reclamation and incineration. If considering limitations of ocean speculation and land reclamation methods, incineration or combustion is the most advantageous among the waste treatment methods. Particularly, for animal diseases such as food-and-mouth disease, prompt incineration of dead bodies with mobile incinerator will be helpful to prevent the second environmental pollution by diseased dead bodies movable.
Therefore, in this study, small incinerator is designed with high burning rate for prompt incineration on the spot.
To develop high-performance incineration technology of solid granulated waste, combustor which grafts the technology of rocket engine combustor with the highest energy density onto existing technology was suggested.
Small incinerator with the new concept was designed for combustion performance higher than conventional combustion facility by about 10 times and numerical study was conducted so as to find technology which is necessary to develop incinerator suitable for the above purposes (high-performance incinerator).
First, an optimization study on combustion chamber was conducted based on flow characteristic quantization factor established by precedent studies and swirl number and burnout ratio which are combustion characteristic quantization factors. By selecting injector''s injection angle and length of combustion chamber as design changing factors, combustion analysis was conducted. According to the changes of each design changing factors, flow characteristics were changed and location, size, etc. of flame were changed. Through the quantization of flow characteristics by design changes with swirl number, representative design changing factors were selected and burnout ratio by swirl number was drawn and compared.
In the sector of designing point with low swirl number, burnout ratio was low. And, in the sector of designing point with high swirl number, burnout ratio was high. And, if gap between injectors is thoroughly short, burnout ratio was high. And, numerical value for various forms and flux condition of combustion chamber could be shown as damk?hler number which is a single mediation variable of similar variables.
Combustion analysis for drawing optimal design point by changing geometric form of combustion chamber, like rate of the chamber''s diameter and length, was conducted. If solid particle is big, deflection angle of primary injector which locates flame in the center of combustion chamber makes an effect on burnout ratio.
In the first combustion chamber optimized, combustion performance for solid waste of different kinds was evaluated. Wood has the highest burning rate among them and solid waste and animal carcass has much lower value than coal, but average efficiency was still high absolutely.
To improve combustion efficiency of animal carcass in big size of particle, the second combustion chamber was established. By establishing the second combustion chamber, staying time of fuel was increased and additional chemical response was made, so burnout ratio and pressure were greatly increased.
Before the manufacture of actual combustion chamber, cooling efficiency was analyzed by cooling analysis of combustion chamber by applying the idea for evaluation of safety and improvement of cooling performance. A cooling method used in actual combustion chamber, water cooling method, was applied and temperature of wall was increased as the wall of combustion chamber became thicker. A study on water cooling and complex cooling method was conducted by applying air film cooling. More excellent cooling performance was shown in complex cooling method applied by water cooling rather than single air film cooling.