During the loading phase at oil depots and transit stations, diesel passing through loading arms (crane pipes) into tank trucks often carries secondary pollutants such as tank-bottom rust, sediment, and oxidative gums. Given the high efficiency requirements of loading operations, controlling impurities under high-flow conditions (40-60t/h) is critical for ensuring delivery quality. This paper analyzes the application of the JY-DL60 system in this specific scenario.
1. Filtration Mechanism at the Loading Terminal
In the pipelines preceding loading arms, traditional depth filtration equipment often struggles with the conflict between high pressure drops and short filter element lifespans. To address this, the system employs a “Dead-end Filtration” mechanism. The logic involves forcing 100% of the fluid through the membrane layer to achieve absolute particle interception, maintaining an outlet cleanliness standard of ISO 4406 14/12/9.
The physical structure utilizes an “Out-to-In” flow design. As diesel enters the shell side of the membrane module, impurities are trapped on the outer surface of the tubular membrane, while clean fuel penetrates the membrane wall to exit through the tube center. This design allows larger particles to pre-settle via gravity, reducing the instantaneous load on the membrane surface.
2. Power Loss and Flow Path Parameters
Under high-flow pumping environments, the system operating pressure is maintained between 0.2 and 0.35 MPa. Since the fluid only needs to overcome a permeation resistance of approximately 0.2 MPa, the solution achieves a rated capacity of 40-60t/h without significantly reducing the pumping efficiency of existing loading pumps. This low-pressure-drop characteristic enables series deployment within existing terminal pipeline networks.
3. Interception and Removal of Particulates and Gums
Oxidative gums in diesel are a primary cause of clogging in traditional filters. The JINGYUAN modified tubular membrane in the JY-DL60 addresses the threat of gum aggregates to downstream precision injection systems through physical interception.
To achieve “zero-consumable” operation, the system integrates nitrogen pulse online regeneration technology.
- Trigger Mechanism: Saturation of the membrane surface is determined via pressure monitoring.
- Regeneration Process: Compressed nitrogen at 0.4-0.6 MPa is used for instantaneous reverse backwashing from inside the membrane tube.
- Effect: The gas dislodges the impurity filter cake attached to the outer wall, and high-concentration contaminants settle to the bottom for discharge. The regeneration process is brief and does not disrupt continuous loading cycles. The membrane elements are designed for a service life of 2-3 years.
4. Technical Conclusion
By deploying a dead-end filtration system at the loading arm terminal, oil depots can achieve compliant purification in a single pass. By replacing disposable filters with physical regeneration, this approach aims to optimize the comprehensive operational and maintenance costs of large-scale diesel supply chains.