多組分燃氣旋流預混合燃燒特性研究
[Abstract]:Low swirl combustion (LSC) technology is a kind of combustion mode which deviates from the traditional reflux flame stabilization mechanism and uses the low rotation diffusion non-reflux turbulent flow to stabilize the free-propagating turbulent flame. Low swirl nozzle (LSI) has the advantages of simple structure, low cost and easy to adapt to the existing gas turbine, such as low Nox emission. Therefore, the study of low swirl combustion has important application value and academic significance. In this paper, the combustion chamber is designed and installed on the combustion test bench. The mixture of propane, methane and hydrogen methane is used as fuel. The swirl number of the cyclone is changed by replacing the central orifice plate of the low swirl nozzle. The main swirl number used is S0. 521 0. 545U 0. 575N 0.623. In this paper, the flame spectrum of low swirl lean premixed combustion was measured by spectrometer, and the flame morphology of low swirl lean premixed combustion was photographed by Canon EOS 7D camera. The flame axial and radial temperatures of low swirl lean premixed combustion were measured by B type double platinum rhodium thermocouple, and the emission of flame pollutants from low swirl lean premixed combustion was measured by portable flue gas analyzer. The following conclusions are obtained: (1) the relative energy values of OH and CH radicals decrease with the increase of swirl number S during the combustion of methane mixed with hydrogen. (2) the blue flame changes from "W" to "broom". With the increase of swirl number, the distance between flame leading edge and nozzle is shortened. With the decrease of C H ratio of fuel, the color of the flame becomes lighter obviously. The flame length will also be shortened after mixing hydrogen in methane. (3) there is a high temperature region on both sides of the blue flame temperature profile. With the increase of swirl number, the high temperature region becomes narrower and the temperature gradient on both sides of the blue flame temperature profile becomes steeper. When the swirl number is greater than a certain value (critical swirl number S0 is between 0.575-0.598), the temperature at the top of the flame will change from bimodal to parabolic. (4) with the increase of swirl number S, The radial temperature of low swirl flame center decreases gradually. (5) the emission levels of NO_x and CO of LSI mainly depend on the gas composition and heat load. With the increase of swirl number S, the EI_ (NO_x) of low swirl flame increases. (6) under the same condition, the combustion efficiency of low swirl flame is higher than that of high swirl flame.
【學位授予單位】:大連海事大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TK16
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