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Energies 2018, 11(9), 2379; https://doi.org/10.3390/en11092379

Dynamic Efficiency Analysis of an Off-Shore Hydrocyclone System, Subjected to a Conventional PID- and Robust-Control-Solution

Department of Energy Technology, Aalborg University, Esbjerg 6700, Denmark
Current address: Niels Bohrs Vej 8, Esbjerg 6700, Denmark.
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Received: 8 August 2018 / Revised: 29 August 2018 / Accepted: 5 September 2018 / Published: 9 September 2018
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Abstract

There has been a continued increase in the load on the current offshore oil and gas de-oiling systems that generally consist of three-phase gravity separators and de-oiling hydrocyclones. Current feedback control of the de-oiling systems is not done based on de-oiling efficiency, mainly due to lack of real-time monitoring of oil-in-water concentration, and instead relies on an indirect method using pressure drop ratio control. This study utilizes a direct method where a real-time fluorescence-based instrument was used to measure the transient efficiency of a hydrocyclone combined with an upstream gravity separator. Two control strategies, a conventional PID control structure and an H robust control structure, both using conventional feedback signals were implemented, and their efficiency was tested during severely fluctuating flow rates. The results show that the direct method can measure the system’s efficiency in real time. It was found that the efficiency of the system can be misleading, as fluctuations in the feed flow affect the inlet concentration more than the outlet oil concentration, which can lead to a discharge of large oil quantities into the ocean. View Full-Text
Keywords: water treatment; de-oiling; offshore oil and gas; oil-in-water monitoring; feedback control; robust control; hydrocyclones water treatment; de-oiling; offshore oil and gas; oil-in-water monitoring; feedback control; robust control; hydrocyclones
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Durdevic, P.; Yang, Z. Dynamic Efficiency Analysis of an Off-Shore Hydrocyclone System, Subjected to a Conventional PID- and Robust-Control-Solution. Energies 2018, 11, 2379.

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