液体燃料の予蒸発・予混合燃焼におけるNO_x排出特性

概要

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An experimental study was conducted to examine NO_x emission of a premixing-prevaporizing flame stabilized with a bluff body. The liquid fuels, such as kerosene and light oil, were sprayed into the premixing-prevaporizing chamber with an air-atomizing nozzle. The size distribution of fuel spray, vaporizing time and heterogeneity of the mixtures were varied by varying the degrees of atomization and the length of the premixing-prevaporizing chamber. Velocity, concentration and Sauter mean diameter of the fuel spray in the vaporizing process were measured by means of a particle dynamics analyzer (PDA). The NO_x emissions from premixed -prevaporized flames decreased with decreasing size of sprayed fuel droplets and increasing vaporizing rate. It was possible to reduce the NO_x emissions from kerosene flames to the same level as methane-air premixed flames. While light oil has the lowest vaporizing rate, the temperature profile of its flame became similar to that of the methane flame and its NO_x emission level also approached that of the methane flame with the promotion of vaporization.
1993-07-25