Polymer Flow Control in Continuous Gravimetric Blenders

In this paper, the design of a plastic flow control system for continuous gravimetric blenders used in polymer extrusion processes is discussed. The considered plant is a blending machine that mixes four different polymers, bulks and additives. In order to pursue the desired behavior, three control objectives are considered: plastic flow estimation based on weight and screw speed measurements, plastic flow regulation for each meter and control of the recipe with mass constraints such that the mixer can always satisfy the plastic flow variation needed by the extruder. Simulation results are used to show the effectiveness of the proposed approach.

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Development of a S-FLOW System and Control (S‑FLOW: Energy Saving Air Flow Control System)

10.4271/2013-01-1499 ◽

2013 ◽

Author(s):

Koichi Tabei ◽

Masashi Watanabe ◽

Nobuyuki Doi ◽

Kenjiro Imai ◽

Stefan Young

Keyword(s):

Control System ◽

Flow Control ◽

Energy Saving ◽

Flow System ◽

Air Flow ◽

Flow Energy ◽

Flow Control System ◽

And Control ◽

Air Flow Control

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Design of Bulk Solid Flow Control System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.898.568 ◽

2014 ◽

Vol 898 ◽

pp. 568-573

Author(s):

Zhao Long Fan ◽

Jian Hui Zhao ◽

Fan Li ◽

Sun Rong

Keyword(s):

Control System ◽

Flow Control ◽

Control Mode ◽

Embedded Operating System ◽

Control Effect ◽

Solid Flow ◽

Stability And Control ◽

Bulk Solid ◽

Flow Control System ◽

And Control

This paper introduced the hardware module, software process, and control mode and communication protocol of bulk solid flow control system based on the C8051F020. It selected the C8051F020 of transplanted uCos-II embedded operating system as the core, used the module software design idea, and realized the cooperation of collection, PID control, communication and other tasks. The industry site experiment showed that the system had good adaptability, stability and control effect, the control accuracy reached to ±1%FS, and the measuring accuracy reached to ±5.

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The Change of Liquid Steel Flow Control System in the Tundish – Modelling Research/ Zmiana Systemu Kontroli Przepływu Ciekłej Stali W Kadzi Pośredniej – Badania Modelowe

Archives of Metallurgy and Materials ◽

10.2478/amm-2014-0244 ◽

2014 ◽

Vol 59 (4) ◽

pp. 1433-1440 ◽

Cited By ~ 3

Author(s):

J. Pieprzyca ◽

T. Merder ◽

M. Saternus ◽

H. Kania

Keyword(s):

Control System ◽

Flow Control ◽

Residence Time ◽

Liquid Steel ◽

Time Distribution ◽

Residence Time Distribution ◽

Flow Regulation ◽

Flow Control System ◽

Steel Flow

Abstract The article presents the results of research concerning the change of liquid steel flow and mixing in the T-type tundish. It has been installed in one of polish steel plants. Continuously changing market conditions have forced the change in the range of cast strand. As a consequence the new control system of liquid steel flow had to be applied. Up to now a baffle with notch has played the role of steel flow regulation. It was placed between the inlet and channel zones of a tundish. However such solution was not satisfactory. Therefore, a new flow control equipment was designed - baffles and different constructional variants of turbulence inhibitors. To estimate the efficiency of their functioning and in the same time their influence on the tundish work, modelling research was carried out. The research was also complemented by numerical simulations. The article presents results of such research as well as experimentally and numerically determined RTD curves of mixing (Residence Time Distribution).

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