Study of the development of solid particle pollution of pipeline transportation of aviation kerosene

Aviation kerosene, as a fuel for aircraft, has seen rapid growth in demand in recent years. The increased transportation of aviation kerosene in oil product pipelines can increase the profits of pipeline companies. However, GB6537-2018 has strict requirements on the quality of aviation kerosene, especially for its cleanliness. Therefore, how the cleanness quality indicators, such as solid particles will change after aviation kerosene is transported through the pipeline, and whether it is affected by impurities in the pipeline is of particular concern to pipeline companies. In order to find out the source of solid particulate pollutants, and analyze the impact of a shutdown on the quality of aviation kerosene, this paper proposes to use the online immersion experiment method to study the changes of pollutant indicators in aviation kerosene pipelines: based on the scheduled shutdown of aviation kerosene between the refinery and the pumping station, the deposition and variation of particulate matter in aviation kerosene at different positions of the pipeline during shutdown are analyzed, and the possible pollution pipeline sections and pollutant sources leading to high solid particulate matter content in the oil depot are determined. By comparing the rise and fall of solid particulate matter content of aviation kerosene when in the pipeline and after entering the terminal oil tank, the migration behavior of different types of impurities are deduced. The experiment found that: (1) Topographic difference is an important reason for the differences of solid particulate pollution. For continuous up-dipping pipelines, solid particles gradually aggregate into clusters in the oil flow, heavier solid particles such as sand and rust are deposited at the bottom, and light suspended solid particles are carried to the downstream pipeline by the oil flow, and the accumulation increases. For downslope pipelines with a large drop, due to the action of potential energy at the bottom of the slope, the heavy and light solid particles are deposited at the bottom of the slope. Even if they are carried downstream by the kerosene flow, they can settle to the bottom when the pipeline is stopped. Therefore, for the continuous upward slope pipeline, attention should be paid to the aggregation of downstream light particles, and the filter element of the downstream pump station should be replaced regularly. For downslope pipelines, attention should be paid to the increase in the downstream solid particle content and the sedimentation of heavy particles caused by the heavy particles carried by the fuel flow. Due to the presence of more heavy particulate matter, attention should be paid to proper static sedimentation during quality control. (2) Although aviation kerosene is filtered several times before the pumping along the pipeline and in front of the oil tank at the terminal station, if there are too many impurities in the pipeline, there is still a risk of excessive solid particles content when the aviation kerosene arrives at the terminal station. Therefore, it is still necessary to pay attention to the quality control of aviation kerosene during pipeline transportation. This research provides support for determining the pigging frequency and ensuring the quality of pipeline transportation of aviation kerosene.