吴廉巍, 王兴刚, 石帅, 等. 柴油机烟气喷淋条件下烟黑浓度测量实验研究[J]. 中国舰船研究, 2023, 18(1): 269–276. doi: 10.19693/j.issn.1673-3185.02354
引用本文: 吴廉巍, 王兴刚, 石帅, 等. 柴油机烟气喷淋条件下烟黑浓度测量实验研究[J]. 中国舰船研究, 2023, 18(1): 269–276. doi: 10.19693/j.issn.1673-3185.02354
shu
WU L W, WANG X G, SHI S, et al. Experimental research on measurement of soot concentration under spraying on exhaust gas of diesel engine[J]. Chinese Journal of Ship Research, 2023, 18(1): 269–276. doi: 10.19693/j.issn.1673-3185.02354
Citation: WU L W, WANG X G, SHI S, et al. Experimental research on measurement of soot concentration under spraying on exhaust gas of diesel engine[J]. Chinese Journal of Ship Research, 2023, 18(1): 269–276. doi: 10.19693/j.issn.1673-3185.02354
shu

柴油机烟气喷淋条件下烟黑浓度测量实验研究

Experimental research on measurement of soot concentration under spraying on exhaust gas of diesel engine

    摘要
  • 摘要:
      目的  为探讨水喷淋方式对柴油机烟气的烟黑净化处理效果，开展相关实验研究。
      方法  利用Dekati型低压撞击器（DLPI）对烟道中烟黑进行取样，采用在取样枪上包裹加热带并控制其温度的方法防止喷淋后湿烟气冷凝，使湿烟气中烟黑进入DLPI时与其在烟道中的状态相同。实验首先利用烟气分析仪对烟气浓度均匀性进行测量，验证烟气分布基本均匀；然后利用DLPI确定取样时间，进而对不同柴油机负荷、不同喷淋水量下的烟黑净化效率进行测量比较分析。
      结果  结果表明：水喷淋对烟黑的净化效率可达到50%；相同喷淋流量下，柴油机100%负荷下的烟黑净化效率高于50%负荷；当喷淋流量达到一定值后，其烟黑捕集净化效率可能达到极值；烟气在喷淋之后大粒径的烟黑颗粒明显减少，而小颗粒烟黑会发生团聚作用，在50%负荷下由于烟气速度较低，水雾与烟黑接触时间更长，小颗粒烟黑团聚效果比100%负荷中更明显。
      结论  水喷淋可有效降低柴油机烟气烟黑排放。

     

    Abstract:
      Objective  In this paper, experiments are carried out to investigate the effects of water spray on the soot removal of diesel engine flue gas.
      Method  A Dekati low pressure impactor (DLPI) is used to sample smoke soot in a flue. The sampling gun is wrapped in a heating belt and the temperature is controlled to prevent the condensation of wet flue gas after spraying and maintain the same state of soot in the flue. First, the uniformity of flue gas concentration is measured by a flue gas analyzer to verify that the flue gas distribution is basically uniform, and the sampling time is determined by DLPI. The soot purification efficiency under different diesel engine loads and different water spray volumes is then measured and compared.
      Results  The results show that the efficiency of soot removal can reach 50%. Under the same spray rate, the soot removal efficiency of the diesel engine under 100% load is higher than that under 50% load. When the spray rate reaches a certain value, the efficiency of soot collection and purification may reach the extreme value. Under 50% load, the contact time between water spray and soot is longer, and the agglomeration effect of small particles is more obvious than under 100% load.
      Conclusion  The measurement results show that water spray can effectively reduce the soot emissions of diesel engines.

     

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