燃油硫分对柴油机排气成分的影响

为研究燃油中不同的硫质量分数在柴油机内的燃烧状况及对柴油机排气成分的影响,通过对比试验,利用化学发光法、定电位电解法、磁气风式法、Galvanic Cell Type法及过滤称重法分别测定了硫分质量分数为0、1.5、3.0和5.0时的NOx、SOx、COx、残碳颗粒(DS)及可溶性有机物质(SOF)的浓度及对着火延迟的影响。实验结果表明燃油硫质量分数对柴油机燃烧状况有着一定程度的影响,随着燃油硫质量分数的增加,燃油消耗量也随之增加,在硫质量分数3.5%范围内对燃油消耗量的影响最为显著,随后处于平缓,并从而影响排烟温度。CO随硫质量分数的增加而明显上升,但CO2基本保持不变;随着硫质量分数的增加,SOF生成量反而下降,而DS的生成量则随之上升;NOx含量随着燃油中硫分质量分数的增加而呈下降的趋势。

燃油硫分分析方法研究进展

综述了目前燃油硫分分析方法,包括色谱法、光谱学法、微库仑分析技术、X射线分析方法等。指出定性和定量分析燃油中数百种硫化物的方法和仪器的优缺点,并应将多种分析方法配合使用才能精确的分析硫分。

Deep Hydrodesulfurization of Diesel Fuel over Diatomite-dispersed NiMoW Sulfide Catalyst

Diatomite-dispersed NiMoW catalyst was prepared and characterized,and the activity of catalyst samples was tested during the HDS reaction of FCC diesel.Sulfur compounds in the feedstock and the hydrogenated products obtained over different catalysts were determined by GC-PFPD.The test results showed that the diatomite-dispersed NiMoW catalyst had high hydrodesulfurization activity for FCC diesel,which could be contributed to the excellent hydrogenation performance of the said catalyst.Characterization of catalyst by TEM and XRD indicated that the diatomite-dispersed NiMoW catalyst possessed higher layer stacking,larger curvature of MoS2or WS2,and segregated Ni3S2crystals relative to the supported catalyst.This kind of structure leads to high hydrogenation activity of the diatomite-dispersed NiMoW catalyst.

主机故障与管理缺失

主机故障与管理工作是否到位有密切关系。针对主机的不同特点和性质加强管理,才能避免故障的发生。本文以几个主机故障案例来说明机舱管理工作的重要性。