| 齿形木纤维柴油车尾气微粒捕集器过滤效率模型与试验 |
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| 引用本文： | 郭秀荣,杜丹丰,亓占丰,梁中钰,刘跃雄.齿形木纤维柴油车尾气微粒捕集器过滤效率模型与试验[J].农业工程学报,2016,32(7):66-71. |
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| 作者姓名： | 郭秀荣 杜丹丰 亓占丰 梁中钰 刘跃雄 |
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| 作者单位： | 1. 东北林业大学机电工程学院,哈尔滨,150040;2. 东北林业大学交通学院,哈尔滨,150040 |
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| 基金项目： | 国家自然科学基金项目（51378096，31470611）；中央高校基本科研业务费专项资金项目（2572014EB04） |
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| 摘 要： | 为增大柴油车尾气微粒捕集器滤芯的过滤面积,降低滤芯的过滤阻力,提高滤芯的过滤效率,设计了一种内部具有中空通道的齿形木纤维柴油车尾气微粒捕集器滤芯。首先根据纤维材料的过滤理论,建立齿形木纤维滤芯的过滤效率模型;然后通过理论分析和数值计算得到滤芯过滤效率与各影响因素之间的关系曲线;最后利用自行研制的滤芯性能检测试验台对理论分析结果加以验证。研究表明,试验和理论结果吻合较好,当尾气微粒捕集器过滤室壳体尺寸为直径140 mm,高150 mm时,木纤维直径为15μm、滤芯填充率为0.3、滤芯厚度为12 mm时滤芯过滤效率和过滤阻力都处于较理想的范围,使用寿命可达60 h,过滤效率为96%,排气背压为3 k Pa,完全能满足柴油车尾气排放国家标准。该研究对柴油车尾气净化机及环境保护具有十分重要的意义。
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| 关 键 词： | 柴油机 纤维 模型 齿形 微粒捕集器 木纤维滤芯 过滤效率 试验 |
| 收稿时间： | 2015/8/31 0:00:00 |
| 修稿时间： | 2016/2/17 0:00:00 |
Filtering efficiency model and experiment of gear-shaped wood fiber diesel particle filter |
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| Guo Xiurong,Du Danfeng,Qi Zhanfeng,Liang Zhongyu and Liu Yuexiong.Filtering efficiency model and experiment of gear-shaped wood fiber diesel particle filter[J].Transactions of the Chinese Society of Agricultural Engineering,2016,32(7):66-71. |
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| Authors: | Guo Xiurong Du Danfeng Qi Zhanfeng Liang Zhongyu and Liu Yuexiong |
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| Institution: | 1. Mechanical and Electrical College, Northeast Forestry University, Harbin 150040, China,2. Transportation College, Northeast Forestry University, Harbin 150040, China,1. Mechanical and Electrical College, Northeast Forestry University, Harbin 150040, China,1. Mechanical and Electrical College, Northeast Forestry University, Harbin 150040, China and 1. Mechanical and Electrical College, Northeast Forestry University, Harbin 150040, China |
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| Abstract: | Diesel engine is widely used in the fields of industrial and agricultural production and transportation for their good economy and dynamic performance. Unfortunately, diesel engines emit high quantities of particulate matter (PM) which is a potential risk to public health. Micron wood fiber is a kind of porous biological material that can be applied to filter PM emitted by diesel engine. In this paper, in order to increase the filtration efficiency and decrease filtration resistance, a wood fiber filter is developed, of which the internal structure is hollow and the external structure is like gear, and its advantages are low price, less requirement for diesel quality and large adsorption capacity for PM. In these respects, the gear-shaped wood fiber filter is promising in developing countries where the sulphur content is high in diesel oil. This gear-shaped wood fiber filter can be installed in a detachable DPF (diesel particle filter) whose temperature inside can be controlled below 220℃. First of all, based on the filter theory of fiber material, the filtration efficiency model of the gear-shaped wood fiber filter is established. Referring to the existing research and formula, the filtration efficiency of the gear-shaped wood fiber filter can be expressed by theoretical formula to be the function of wood fiber diameter, filling rate of wood fiber filter, thickness of filter and diameter of PM.Due to the diameter of PM ranging from 0.01 to 10μm and mainly concentrating at around 0.1μm, the recommended value of PMdiameter is 0.1μm. Then, through theoretical analysis and numerical calculation, the relationship curve between the filter efficiency and the influence factors is obtained. Lastly, a test bench of the filter performance is set up and used to verify the theoretical analysis results. In the test, we develope 10 gear-shaped wood fiber filters with different parameters according to the simulation results and set the speed and the load of the engine as 2 000 r/min and 50%. The results show that the experimental results are in good agreement with the theoretical results, i.e., the increasing of the filter thickness, the decreasing of the wood fiber diameterand the lowering of the filter filling rate will definitely improve the filtration efficiency of the gear-shaped wood fiber filter. For Lister Petter AA1 diesel engine, when the size of the DPF filter chamber is 140 mm in diameter and 150 mm in height, the filtration efficiency and the resistance of the filter with the wood fiberdiameter of 15μm, the filling rate of0.3, the filter thickness of 12 mm are both in the most ideal range. At this point, the gear-shaped wood fiber filter has high efficiency and low exhaust resistance. When this filter works for 60 h from a new one, the filtration efficiency varies within a small range and the filtration state is relatively stable. When this filter works from 60 to 100 h, the filtration efficiency increases rapidly and reaches 96% at the end. However the filtration resistance exceeds the specified limit and a new wood fiber filter should replace the old one after it works for 100 h. Furthermore, the test results also show that the filtration efficiency of all filters made in test are more than 85%, which can meet the demand of the national standard of the diesel exhaust emission. |
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| Keywords: | diesel engines fibers models gear-shaped diesel particular filter wood fiber filter core filtration efficiency experiment |
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