共查询到20条相似文献,搜索用时 31 毫秒
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Yingxin Cui Yixi Cai Runlin Fan Yunxi Shi Linbo Gu Xiaoyu Pu Jing Tian 《International Journal of Automotive Technology》2018,19(5):759-769
To study the effects of residual ash on the capture and regeneration of a diesel particulate filter (DPF), repeated capture and complete regeneration experiments were conducted. An engine exhaust particulate sizer was used to measure the particle size distribution of diesel in the front and back of DPF. Discrepancies in the size distribution of the particulate matter in repeated trapping tests were analyzed. To achieve complete DPF regeneration, a DPF regeneration system using nonthermal plasma technology was established. The regeneration carbon removal mass and peak temperatures of DPF internal measuring points were monitored to evaluate the effect of regeneration. The mechanism explaining the influence of residual ash on DPF capture and regeneration was thoroughly investigated. Results indicate that the DPF trapping efficiencies of the nuclear-mode particles and ultrafine particles have significant improvements with the increase quantity of residual ash, from 90 % and 96.01 % to 94.17 % and 97.27 %, respectively. The exhaust backpressure of the DPF rises from 9.41 kPa to 11.24 kPa. Heat transfer in the DPF is improved with ash, and the peak temperatures of the measuring points accordingly increase. By comparing the regeneration trials, the elapsed time for complete regeneration and time difference for reaching the peak temperature between adjacent reaction interfaces are extended with increased quantity of ash. The carbon removal mass rises by 34.00 %. 相似文献
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J. M. Lee N. W. Sung G. B. Cho K. O. Oh 《International Journal of Automotive Technology》2010,11(3):307-316
An analytical study of the performance of a radial-type, metal foam diesel particulate filter is reported. A mathematical
model for the filtration and regeneration of soot in a metal foam filter was developed. Nickel foam was selected for the filter
medium due to its large specific area, high porosity, and high thermal resistance. For various metal foams, the filtration
efficiency and the pressure drop through the filter were calculated, as was the deposition of soot. The results from the analytical
model were compared with experimental data. In comparison with a conventional wall flow filter, the metal foam diesel particulate
filter (DPF) is effective in utilizing the volume of material, due to the porous structures. As the size of the metal foam
pores in the DPF increases from 580 μm to 800 μm, the filtration efficiency decreases from 90% to 50%, and the pressure drop
decreases from 380 mbar to 20 mbar. The metal foam DPF with a large pore size is effective in utilizing the volume of material
with a small pressure drop. The regeneration is completed within four minutes by the flow of hot exhaust gases under full
load conditions. 相似文献
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D. Wang Z. C. Liu J. Tian J. W. Liu J. R. Zhang 《International Journal of Automotive Technology》2012,13(7):1023-1032
Particle number measurement is a new approach to determine emission, which may be more accurate at very low emission levels than when using gravimetric measurements. An experimental study was performed to investigate the effect of fuel properties on the performance, combustion process, regulated gaseous emissions and particle number emissions of a diesel engine with an uncatalyzed diesel particulate filter (DPF). The effect of the filter on the particle size distribution was reported. The DPF number-based filtration efficiency in terms of number efficiency and fractional efficiency for petroleum diesel fuel and two alternative fuels, BTL and GTL, were analyzed. For nearly all test modes, the filter had a higher number efficiency for diesel than for BTL and GTL. The DPF fractional efficiency showed it was highly dependent on fuel type and varied widely at each size range. For diesel, the filter fractional efficiency was sufficiently high and behaved as predicted by filtration theory. For BTL and GTL, the fractional performance of the filter decreased when unexpectedly low efficiencies within the nuclei mode were exhibited. This research will be helpful in understanding DPF number-based filtration performance for alternative fuels and will provide information for the development of particulate emission control technology. 相似文献
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通过调研国内外文献,介绍了柴油机颗粒物污染现状、颗粒物后处理技术、壁流式颗粒捕集器(DPF)的工作原理、材料和结构类型、捕集器再生技术和控制策略等。堇青石陶瓷壁流式DPF具有成本和性能方面的优势,占据主要市场份额,再生技术是DPF应用的关键。与主动再生技术相比,被动再生具有结构简单、节约油耗等优势,可通过涂敷催化剂、前置DOC和辅助主动再生等方法确保再生效果。 相似文献
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CDPF再生性能的试验研究 总被引:2,自引:0,他引:2
基于外加热源再生性能测试台架,研究了来流参数和灰沉积对催化型柴油机颗粒捕集器(CDPF)再生性能的影响规律,并比较了DPF和CDPF在再生性能上的差异。结果表明:随着来流温度的增加,载体的最高温度和最大温度梯度先保持不变,后迅速增大,再生效率和效能比也逐渐增大;随着来流温度脉冲持续时间的增长,载体的最高温度基本保持不变,最大温度梯度略有增大,再生效率逐渐增大,但效能比却逐渐降低;随着灰沉积量的逐渐增大,载体的最高温度和最大温度梯度基本保持不变,再生效率和效能比却逐渐降低;在来流温度为475℃时,相较于DPF内碳黑基本不发生反应,CDPF内碳黑发生剧烈氧化,最高温度和最大温度梯度升高,再生效率和效能比也随之升高。 相似文献
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以混凝土搅拌站袋式除尘器为研究目标,在solidworks中建立袋式除尘器的三维实体,利用fluent流体分析软件对内部流场进行数值模拟,得到其内部的速度、压力以及流体轨迹等参数分布,来探究影响除尘器使用寿命的因素,为袋式除尘器的优化提供理论支撑。 相似文献
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采用燃烧器+氧化催化器的柴油机微粒捕集器复合再生控制策略的研究 总被引:3,自引:1,他引:2
设计了一种车载全流式燃烧器,从增压柴油机的涡轮增压器取出新鲜空气,从回油管路取油供给燃烧;将该装置安装在排气管尾端使捕集器进行再生.在燃烧器和捕集器之间增加氧化催化器,实现了在发动机所有稳态工况下捕集器的复合再生.在排气背压的再生控制策略基础上,根据经验公式对背压值进行温度修正,将三维背压MAP简化为二维,提出"恒温定时"的复合再生控制策略,分析了控制策略在不同工况区域的运用,给出了再生过程分析实例.对既定的控制策略进行了实车试验,结果表明微粒排放达到了国Ⅳ标准. 相似文献
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B. J. Shim K. S. Park J. M. Koo M. S. Nguyen S. H. Jin 《International Journal of Automotive Technology》2013,14(2):207-212
By high particulate matter(PM) reduction performance, diesel particulate filter(DPF) is applied to almost all of modern HSDI diesel engine. PM emitted from diesel engine is consist of carbon based and non-carbon based material. Representative carbon based PM is soot. Non-carbon based PM is produced by wear of engine and exhaust component, combustion of lubrication oil and sulphur in fuel. Accumulation of non-carbon based PM affects pressure difference of DPF and thus accuracy of soot mass estimation in DPF can be lowered during normal and regeneration condition when the pressure difference caused by non-carbon based PM is not recognized correctly. Also unevenly accumulated PM inside of DPF can produce locally different exhaust gas temperature and thus it can lower accuracy of soot mass estimation during regeneration. This study focuses on estimation of soot oxidation rate not by conventional pressure difference but by exhaust gas analysis at up and downstream of DPF. Results, strong correlations between CO2 -fuel mass ratio and soot oxidation was observed. 相似文献
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Xiaoyu Pu Yixi Cai Yunxi Shi Jing Wang Linbo Gu Jing Tian Runlin Fan 《International Journal of Automotive Technology》2018,19(3):421-432
In order to investigate the influence of initial regeneration temperatures on diesel particulate filter (DPF) regeneration, an experimental study of DPF regeneration was implemented using a dielectric barrier discharge (DBD) reactor, aided by exhaust waste heat after engine flameout. DPF trapping characteristics and carbon deposit mass were discussed to facilitate further data analysis and calculation. DPF regeneration was then investigated by comparison analysis of deposit removal mass, backpressure drop, and internal temperature change. The results revealed that a large amount of particulate matter (PM) was deposited in DPF with a high filtration efficiency of about 90 %. The deposit removal rate and percentage drop of the backpressure both maximized at the initial temperature of 100 °C. During DPF regeneration, the sharp rise of internal temperature indicated vigorous PM incineration and high CO2 emission. The results successfully demonstrated DPF regeneration using non-thermal plasma injection during engine flameout, and prominent heat durability was achieved in this method. 相似文献
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