本文關(guān)鍵詞： 碳煙顆粒 乙烯/氧氣/氬氣預(yù)混火焰 燃空當(dāng)量比 火焰高度 納觀結(jié)構(gòu) 氧化特性　出處：《天津大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,化石燃料排放的碳煙顆粒對(duì)大氣環(huán)境和人體健康造成了嚴(yán)重的危害,導(dǎo)致政府和公眾對(duì)燃燒源顆粒物的關(guān)注程度不斷提高。燃燒過程中碳煙顆粒的生成機(jī)理及演化歷程已成為國(guó)內(nèi)外的研究熱點(diǎn)。本文基于乙烯/氧氣/氬氣預(yù)混燃燒系統(tǒng),采用了熱泳探針取樣和毛細(xì)管取樣系統(tǒng),并結(jié)合場(chǎng)發(fā)射透射電子顯微鏡(TEM)、拉曼光譜儀(RS)、熱重分析儀(TGA)等多種先進(jìn)的分析技術(shù),系統(tǒng)而深入地研究了燃燒工況對(duì)碳煙顆粒微觀形貌、納觀結(jié)構(gòu)、石墨化程度等物理特性及氧化活性的影響規(guī)律。主要研究?jī)?nèi)容和結(jié)論如下:微觀形貌研究發(fā)現(xiàn),碳煙顆粒的演化歷程包括:初期的成核,中期的表面生長(zhǎng),凝并和團(tuán)聚,末期的氧化。隨著火焰高度的增加,碳煙顆粒從初生態(tài)碳煙逐漸演化為成熟的團(tuán)聚態(tài)碳煙。團(tuán)聚態(tài)碳煙的分型維數(shù)介于1.36~2.03之間,且隨著火焰高度和燃空當(dāng)量比的增加而逐漸增大;基本碳粒子的平均粒徑介于14.706~21.397nm之間,隨燃空當(dāng)量比和火焰高度的增大,基本碳粒子平均粒徑逐漸增大�；咎剂Ｗ恿椒植挤秶笾陆橛�8~29nm之間,呈單峰分布,峰值集中在14~25nm的范圍內(nèi);粒徑峰值分布隨著燃空當(dāng)量比和火焰高度的增大也逐漸增加。預(yù)混火焰所生成碳煙顆�；咎剂Ｗ拥钠骄⒕С叽�、微晶曲率和層間距分別介于0.741~1.250nm、1.385~1.491和0.348~0.390nm之間;隨著燃空當(dāng)量比和火焰高度的增加,微晶尺寸逐漸增大,微晶曲率和層間距逐漸變小。預(yù)混火焰碳煙顆粒的AD1/AG介于1.82-2.76之間,D2和D4峰面積比重分別介于14.78%~20.62%與3.76%~7.51%之間。隨燃空當(dāng)量比和火焰高度的增加,AD1/AG逐漸增加,而D2和D4峰面積比重逐漸降低。表明,隨燃空當(dāng)量比和火焰高度的增加,碳煙顆粒的石墨化程度不斷增加,無序化程度逐漸降低。碳煙顆粒樣品的起始氧化溫度(Ti)、最大燃燒速率溫度(Tmax)和燃盡溫度(Th)分別介于480.43~552.75℃、566.57~656.33℃和632.37~725.83℃之間,表觀活化能在136.71~165.69KJ·mol~(-1)之間變化。隨燃空當(dāng)量比和火焰高度的增加,以上四個(gè)氧化特征參數(shù)均呈逐漸增大的趨勢(shì),表明碳煙顆粒的氧化活性降低。本文的研究結(jié)果對(duì)碳煙顆粒生成機(jī)理、演化過程的認(rèn)知以及柴油機(jī)微粒的控制有著一定的理論參考價(jià)值。
[Abstract]:In recent years, soot particles emitted from fossil fuels have caused serious harm to atmospheric environment and human health. As a result, the government and the public pay more and more attention to the particulate matter of combustion source. The mechanism and evolution of soot particles in the combustion process have become a hot topic at home and abroad. This paper based on ethylene / oxygen / argon premixed combustion. Burning system. The thermal probe sampling system and capillary sampling system were used, and various advanced analytical techniques, such as field emission transmission electron microscope (TEM), Raman spectrometer (RS) and thermogravimetric analyzer (TGA), were used. The effects of combustion conditions on the morphology, nano structure, graphitization degree and oxidation activity of soot particles were studied systematically and deeply. The main contents and conclusions were as follows: the microscopic morphology was found. The evolution process of soot particles includes initial nucleation, surface growth, condensation and agglomeration, and final oxidation with the increase of flame height. Soot particles gradually evolved from ecological soot to mature agglomerated soot. The parting dimension of agglomerated soot was between 1.36 and 2.03, and increased with the increase of flame height and ratio of combustion-to-air ratio. The average particle size of the basic carbon particles is between 14.706 and 21.397nm, which increases with the increase of the ratio of combustion to air volume and the flame height. The average particle size of the basic carbon particle increases gradually. The distribution range of the basic carbon particle size is about 829 nm, with a single peak distribution, the peak value being in the range of 14 ~ 25 nm. The peak particle size distribution increases with the increase of the ratio of combustion to air ratio and the flame height. The average microcrystalline size of the basic carbon particles produced by the premixed flame is also increased. The curvature and interlayer spacing of the microcrystals are between 0.741Nm 1.250nm 1.385Nm 1.491 and 0.348Nm 0.390 nm, respectively. With the increase of the ratio of fuel to air and the flame height, the size of microcrystal increases, the curvature of microcrystal and the interlayer spacing become smaller. The AD1/AG of the pre-mixed flame soot particles is between 1.82-2.76. The peak area ratios of D2 and D4 were between 14.78% and 3.76%, respectively, and AD1 / AG gradually increased with the increase of the ratio of fuel to air volume and the height of flame. However, the peak area specific gravity of D2 and D4 decreases gradually, which indicates that the graphitization degree of soot particles increases with the increase of the ratio of combustion / air ratio and flame height. The initial oxidation temperature (Tmax) and the maximum combustion rate (Tmax) of soot particle samples are between 480.43 and 552.75 鈩，

本文編號(hào)：1483718