【作者】 吴百春；

【导师】 钟秦；

【作者基本信息】 南京理工大学 ， 环境工程， 2003， 硕士

【摘要】 本文以喷射鼓泡反应器作吸收装置，采用凹凸棒粘土吸收剂进行柴油机废气净化实验，通过实验研究了吸收剂的结构性质、脱除废气中碳烟的机理和喷射鼓泡反应器的动力学特性，探讨了该技术应用于柴油车的可行性，从而为柴油车尾气净化开辟新的技术途径。研究结果表明：凹凸棒粘土吸收剂具有表面活性，能改善碳烟在吸收剂中的润湿性和溶解能力；凹凸棒粘土颗粒还具有胶体吸附特性，能显著提高各污染物的脱除效率。喷射鼓泡反应器独特的涡流式气液流动方式为气液传质提供了较好的接触面积和停留时间，强化了气液间传质效率，装置结构简单、体积小、压力损失小等优点。通过实验还讨论了液层高度、吸收剂浓度、柴油车工况等因素对污染物脱除效率的影响，确定了该净化系统的最佳操作条件：液高150mm～180mm、吸收剂浓度41.2％、喷射口气体流速10m·s^-1～20m·s^-1，气泡上升的速度0.1m·s^-1～0.3m·s^-1，此时，碳烟脱除率为66.7％，SO₂脱除效率为96％，NO_x脱除效率为91.4％。更多还原

【Abstract】 This paper has done such an experiment that diesel exhaust gas was purified by attapulgite clay absorbent in a jet bubble reactor (JBR) in order to look for a new approach to purify diesel exhaust gas. The test has studied the structure and the characters of absorbent, the removal mechanism of soot from diesel exhaust gas, dynamic characters of JBR reactor, and probed the feasibility of this technique using in the diesel vehicles The result shows that attapulgite clay possesses surfactancy and nature of a colloid, and can improve the wettability and solubilization of soot particulate in absorbent, and obviously increase the removal rate. JBR offers the best contact area and retention time for its unique vortex liquid flow mode, and strengthen mass transfer efficiency. The reactor has some merits, such as simple structure, small volume, the low pressure-resistance, etc. The experiment has discussed the effects of some factors to removal pollution from diesel exhaust gas, such as the liquid level, the absorbent concentration and the diesel running modes, etc. The best operation conditions of the purifying system in the experiment was determined: Liquid height 150mm-180mm, absorbent percent concentration 41.2%, velocity of jet gas flow 10m.s-1-20m.s-1, upward speed of bubble 0.1 m.s-1-0.3 m.s-1. Under the conditions, the removal rate of soot is 66.7%, and that of SO2 is 96%, and that of NOx is 91.4%.更多还原