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Effects of HHO Particulate Morphology from Diesel Engine Fueled with Bio-Diesel

布朗氣對柴油機燃用生物柴油顆粒形貌特徵的影響研究

摘要


To provide a theoretical basis for reducing particulate pollutants from diesel engines fueled with bio-diesel, this paper examines the topographical characteristics of biodiesel combustion particulates, focusing on HHO (brown gas). A 186F trial diesel engine is run at the calibration conditions, and a particle size sampling device is used to collect particulate pollutants when the diesel engine burns biodiesel and conducts co-combustion of biodiesel and HHO. Scanning electron microscopy and transmission electron microscopy are applied to analyze the influence of co-combustion with HHO on the particle morphology and the equivalent area diameter, to examine the change law of the microstructures, such as the spacing of the particles and the crystallite size, with HHO co-combustion and to analyze the functional mechanism of HHO in the generation of particulates. The results show that when the diesel engine is fueled with biodiesel, the surface morphology of the particles is predominantly distributed in lumps, chains and branches, and so on; upon the blending combustion of HHO, the cluster structure is reduced, and the particulates are mostly in a linear and branched distribution. The soluble organic matter on the particle surface is reduced, and the number of particles per unit area is reduced. Co-combustion with HHO can decrease the average equivalent area diameter of the particles by approximately 71.1%, moving the particle diameter in the direction of a small particle size. The increased area of the microcrystalline carbon layer widens the basal advantageous for the process of particle oxidation, and the reduced microcrystalline dimension of the particles increases the curvature and weakens the ordering of the microcrystalline structure on the surface. When biodiesel is blended with HHO, the hydroxyl can accelerate the oxidation of soluble organic matter on the particle surface as well as of the carbon component, reducing the fractal dimension of the particles by 0.04, indicating that the combustion of an HHO blend can reduce the structural tightness of particles. HHO affects the topographical characteristics of biodiesel combustion particles and can effectively reduce the particulate contaminants of bio-diesel.

並列摘要


為了為降低柴油機燃用生物柴油的顆粒污染物提供理論依據,論文圍繞HHO(布朗氣)對生物柴油燃燒顆粒的形貌特徵進行了研究。針對一臺186F試驗柴油機,柴油機在標定工况運行,採用顆粒分級採樣裝置,採集柴油機燃燒生物柴油和生物柴油摻燒HHO的顆粒污染物。分別使用掃描電鏡和透射電鏡分析摻燒HHO對顆粒形貌和等效面積徑的影響規律,研究顆粒的層面間距和微晶尺寸等微觀結構隨HHO摻燒的變化規律,分析HHO對顆粒物生成的作用機理。結果表明,柴油機燃用生物柴油時,顆粒物的表面形貌主要呈團狀、鏈狀和枝狀等狀態分佈,摻燒HHO後,團狀結構减少,顆粒物多呈鏈狀和枝狀分佈,顆粒表面的可溶性有機物减少,組織面積內的顆粒數量減少;摻燒HHO可以使顆粒的平均等效面積徑降低約71.1%,顆粒粒徑向小粒徑方向移動;微晶碳層的面積增大,使得基本碳粒子層面間距有所增加,對顆粒氧化過程的進行有利;顆粒的微晶尺寸减小,彎曲度增大,錶面微晶結構的有序性减弱;生物柴油摻燒HHO後,羥基加速了對顆粒表面可溶有機物以及碳質組分的氧化,導致顆粒的分形維數降低了0.04,表明摻燒HHO可以降低顆粒的結構緊密程度;HHO影響生物柴油燃燒顆粒的形貌特徵,可以有效降低生物柴油的顆粒污染物。

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