scholarly journals Design and Control of Integrated Styrene-Aniline Production Plant

2009 ◽  
Vol 4 (5) ◽  
Author(s):  
Octavian Partenie ◽  
Vincent van der Last ◽  
Costin Sorin Bildea ◽  
Pietro Altimari
Keyword(s):  
Control Structure ◽  
Chemical Reactor ◽  
Stable Operation ◽  
Inlet Temperature ◽  
Production Plant ◽  
Plant Design ◽  
Ethylbenzene Dehydrogenation ◽  
Nitrobenzene Hydrogenation ◽  
Plantwide Control ◽  
And Control

This paper illustrates the operational difficulties arising from simultaneously performing exothermic and endothermic reactions, and demonstrates that a plant can be built and safely operated by integrating the design and plantwide control issues. The behaviour of reactor – separation – recycle systems carrying the coupled reactions A ?P + Q (endo) and B + Q ? R (exo) is investigated. Irrespective of the control structure, state multiplicity cannot be removed if the intermediate component Q is recycled. Therefore, the chemical reactor should be designed such that the recycle of Q can be avoided without economic penalty. The theoretical findings are applied to the design and control of a plant coupling ethylbenzene dehydrogenation and nitrobenzene hydrogenation for simultaneous production of styrene and aniline. After plant design, a rigorous dynamic model is developed using AspenDynamics. A plantwide control structure is implemented and shown to be able to achieve stable operation. Production rate changes of reasonable magnitude can be achieved by changing the reactor-inlet flow rates or bed-inlet temperature.

scholarly journals Assessment of the Plantwide Control Structure in a Pectin Production Plant

2019 ◽  
Vol 52 (1) ◽  
pp. 251-256 ◽  
Author(s):  
F.D. Bähner ◽  
P.A. Santacoloma ◽  
J.K. Huusom
Keyword(s):  
Control Structure ◽  
Production Plant ◽  
Plantwide Control

Application of LabVIEW in Flame Cutter NC System

2008 ◽  
Vol 392-394 ◽  
pp. 121-124 ◽  
Author(s):  
Hong Yun Wang ◽  
G.F. Guo ◽  
Y.X. Li ◽  
Xi Lin Zhu
Keyword(s):  
Data Processing ◽  
Control Structure ◽  
Software Platform ◽  
Nc System ◽  
The Usa ◽  
Nc Machine ◽  
And Control

In this paper, a system was introduced, which bases on Flame Cutter NC System and software platform of LabVIEW which the USA NI company developed. Composing of NC machine, partition of modules and assignments, functions confirming, data processing of machining and control, structure of software by the numbers and realization method of two CPUs. The system makes use of multitasking of LabVIEW to make the programmer realize easily the task, which is difficulty to acquire in in tradition programme. It is a kind of comparatively convenient and swift thinking to realize system interface and multitasking by the platform of LabVIEW.

Automated sequencing batch bioreactor under extreme peaks of 4-chlorophenol

2003 ◽  
Vol 47 (10) ◽  
pp. 175-181 ◽  
Author(s):  
G. Buitrón ◽  
M.-E. Schoeb ◽  
J. Moreno
Keyword(s):  
Dissolved Oxygen ◽  
Metabolic Activity ◽  
Automated System ◽  
Stable Operation ◽  
High Concentration ◽  
Batch Bioreactor ◽  
On Line ◽  
The Moment ◽  
And Control ◽  
System Operating

The operation of a sequencing batch bioreactor is evaluated when high concentration peaks of a toxic compound (4-chlorophenol, 4CP) are introduced into the reactor. A control strategy based on the dissolved oxygen concentration, measured on line, is utilized. To detect the end of the reaction period, the automated system search for the moment when the dissolved oxygen has passed by a minimum, as a consequence of the metabolic activity of the microorganisms and right after to a maximum due to the saturation of the water (similar to the self-cycling fermentation, SCF, strategy). The dissolved oxygen signal was sent to a personal computer via data acquisition and control using MATLAB and the SIMULINK package. The system operating under the automated strategy presented a stable operation when the acclimated microorganisms (to an initial concentration of 350 mg 4CP/L), were exposed to a punctual concentration peaks of 600 mg 4CP/L. The 4CP concentrations peaks superior or equals to 1,050 mg/L only disturbed the system from a short to a medium term (one month). The 1,400 mg/L peak caused a shutdown in the metabolic activity of the microorganisms that led to the reactor failure. The biomass acclimated with the SCF strategy can partially support the variations of the toxic influent since, at the moment in which the influent become inhibitory, there is a failure of the system.

Ownership and Control Structure, Corporate Governance and Income Smoothing in Brazil

2010 ◽  
Author(s):  
Damiana Torres ◽  
Adriano Leal Bruni ◽  
Antonio Lopo Martinez ◽  
Miguel Angel Rivera
Keyword(s):  
Corporate Governance ◽  
Control Structure ◽  
Income Smoothing ◽  
And Control

scholarly journals A SIMPLE FIVE-STEP METHODOLOGY TO DETERMINE CONTROLLABILITY OF HEAT EXCHANGER NETWORKS USING STEADY-STATE INFORMATION

2011 ◽  
Author(s):  
Rodolfo Tellez ◽  
William Y. Svrcek ◽  
Brent R. Young
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Process Integration ◽  
Plant Design ◽  
State Information ◽  
Step Procedure ◽  
Heat Exchanger Networks ◽  
Propose Control Strategy ◽  
Optimum Heat ◽  
And Control

Process integration design methodologies have been developed and introduced to synthesise an optimum heat exchanger network (HEN) arrangement. However, controllability issues are often overlooked during the early stages of a plant design. In this paper we present a five-step procedure that involves the use of multivariable disturbance and control analyses based solely on steady-state information and with the purpose to assess process design developments and to propose control strategy alternatives appropriate and suitable for a HEN.

Collaborative Communication in Interfirm Relationships: Moderating Effects of Integration and Control

1996 ◽  
Vol 60 (3) ◽  
pp. 103-115 ◽  
Author(s):  
Jakki J. Mohr ◽  
Robert J. Fisher ◽  
John R. Nevin
Keyword(s):  
Control Structure ◽  
National Sample ◽  
Interfirm Relationships ◽  
Mutual Support ◽  
Moderating Effects ◽  
Collaborative Communication ◽  
Exchange Relationships ◽  
Governance Strategies ◽  
And Control ◽  
Levels Of Integration

Governance strategies, such as integration or control, structure and regulate the conduct of parties in exchange relationships; as such, they serve to constrain the latitude of the decision making of channel partners. Similarly, collaborative communication can be used to create an atmosphere of mutual support, thereby creating volitional compliance between partners. The authors develop a model that addresses the interrelationships of governance and communication and examine the effects of collaborative communication on channel outcomes (the dealer's perceptions of commitment to, satisfaction with, and coordination of activities with a focal manufacturer) across various levels of integration and control. Based on survey data collected from a national sample of computer dealers, the findings indicate that when levels of integration or manufacturer control are high, the effect of collaborative communication on outcomes is weaker than when integration or control is low.

Ownership and Control Structure of Brazilian Companies

2000 ◽  
Author(s):  
Silvia Mourthe Valadares ◽  
Ricardo P. C. Leal
Keyword(s):  
Control Structure ◽  
And Control

Supporting Co-Design of Physical and Control Architectures of Mechatronic Systems

2011 ◽  
Author(s):  
Andre´s A. Alvarez Cabrera ◽  
Hitoshi Komoto ◽  
Tetsuo Tomiyama
Keyword(s):  
Control Structure ◽  
Mutual Influence ◽  
Early Stage ◽  
Physical Structure ◽  
Mechatronic Systems ◽  
Design Problems ◽  
Software And Hardware ◽  
Design Integration ◽  
And Control ◽  
Recent Tendency

There is a rather recent tendency to define the physical structure and the control structure of a system concurrently when designing the architecture of a product, i.e., to perform codesign. We argue that co-design can only be enabled when the mutual influence between physical system and control is made evident to the designer at an early stage. Though the idea of design integration is not new, to the best of our knowledge, there is no computer tooling that explicitly supports this activity by enabling co-design as stated before. In this paper the authors propose a method for co-design of physical and control architectures as a better approach to design mechatronic systems, allowing to exploit the synergy between software and hardware and detecting certain design problems at an early stage of design. The proposed approach is supported by a set of tools and demonstrated through an example case.

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