کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4998471 1460349 2017 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stochastic evolution of regulation errors in a boundary-actuated desalination plant
ترجمه فارسی عنوان
تکامل تصادفی خطاهای تنظیم در یک گیاه آب شیرین کاری عمل می کند
کلمات کلیدی
کارخانه آب شیرین کن، فرآیند میدان، کنترل مرزی، عدم اطمینان، تکامل نویز تصادفی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
چکیده انگلیسی


- Modelling of a desalination plant as a system of nonlinear, coupled PDEs
- Pressure head stabilization through boundary controls for efficient distillate production
- Performance comparison of two typical plant configurations in terms of characteristic numbers
- Turbulence modelling of the pressure head by means of coloured noises inside the plant
- Pressure head regulation error inside the plant is non-systematic with limited variance (std < 0.3)

A desalination plant - considered in two configurations (once-through and brine recirculation) - is modelled and controlled using a system of coupled PDEs that describe the desalination processes. The analysis is conducted in two separate parts. First, the operating point of the plant is obtained based on the deterministic process models of the plant. The steady-state distillate production is optimized with respect to a reference pressure head (operating point) that is achieved by applying relatively simple boundary controls. Both deterministic plant configurations are compared in term of characteristic numbers that evaluates the energy-efficient operation of the plant. In particular, those are the thermal ratio and the specific flow rate, where gains of roughly 5.5% and 21.5% are obtained in favour of the brine recirculation plant. The pressure head is subject to turbulence phenomena that disturb its surface so that a deterministic model is an insufficient representation of the real-case scenario. Concerning the second part of the paper, the effects of turbulence are incorporated through stochastic elements given as generalized and cylindrical Wiener processes located on the boundaries and throughout the plant (subdomain), respectively. The pressure head residual is defined as the difference between the deterministic and stochastic system. As both systems are actuated by the same type of boundary controls, the residual field is interpreted as a measure of a regulation error. It is statistical characterization is done spatially by means of the first four statistical moments (sampled) and temporarily with the autocorrelation function. It is found that the applied boundary controls are robust enough to keep the regulation error within tight bounds throughout the whole subdomain of the plant. Throughout the plant, the spatial standard deviation (std) is less than 0.3.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Process Control - Volume 54, June 2017, Pages 101-117
نویسندگان
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