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DNTP對柴油機(jī)顆粒物熱重特性與組織形貌的影響
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國家自然科學(xué)基金資助項目(51176067);高等學(xué)校博士學(xué)科點專項科研基金資助項目(20103227110014);江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項目(蘇政辦發(fā)[2011]6號)


Effect of DNTP on Thermogravimetric Characteristics and Morphology of Diesel PM
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    摘要:

    利用熱重分析,、掃描電鏡和透射電鏡等技術(shù)對直噴式柴油機(jī)4種工況下顆粒物(PM)樣品進(jìn)行分析,考察了低溫等離子體(DNTP)處理前后樣品中元素碳和可揮發(fā)物含量,、表面形貌和初級粒子組織形式的變化,。結(jié)果表明:原機(jī)PM中元素碳含量隨負(fù)荷增加逐漸升高,形貌上則從團(tuán)簇積聚狀向?qū)悠询B狀和多孔疏松的海綿狀過渡,,初級顆粒由堆疊厚度大,、分形單一的塊狀形態(tài)逐漸向堆疊厚度小,、分形復(fù)雜的線條式積聚體形態(tài)過渡,;DNTP處理后,,PM中元素碳含量較原機(jī)升高,形貌呈現(xiàn)的規(guī)律與原機(jī)相似,,但在全負(fù)荷呈樹杈狀,;初級粒子的組織形式與原機(jī)全負(fù)荷時獲取的PM樣品相似,表明DNTP可有效地將PM中粘性較高的可揮發(fā)物成分分解。

    Abstract:

    TGA, SEM and TEM were used to investigate the variation of PM properties before and after the treatment of direct nonthermal plasma, including the content of elemental carbon and volatile fractions, the surface morphology and the accumulation form of primary particles. The results showed that with the increasing of load, the content of elemental carbon grew and the morphology changed from accumulated clusters to folium piles and then to porous sponge, and the accumulation of primary particles changed from simple fractal block with high thickness into complex fractal stripes. After the treatment of DNTP, the content of elemental carbon grew and the morphology variation versus diesel load was similar to that of before treatment but presented dendrite structure at full load. Accumulation form of primary particles was similar with that of untreated PM obtained at full load, indicating the volatile fractions with high viscosity can be decomposed effectively by DNTP.

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韓文赫,蔡憶昔,李小華,張琳,江飛,董淼. DNTP對柴油機(jī)顆粒物熱重特性與組織形貌的影響[J].農(nóng)業(yè)機(jī)械學(xué)報,2013,44(1):33-37. Han Wenhe, Cai Yixi, Li Xiaohua, Zhang Lin, Jiang Fei, Dong Miao. Effect of DNTP on Thermogravimetric Characteristics and Morphology of Diesel PM[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(1):33-37.

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  • 在線發(fā)布日期: 2012-12-31
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