On-line automatic control system for monitoring an anaerobic fluidized-bed reactor: response to organic overload

1994 ◽  
Vol 30 (12) ◽  
pp. 11-20 ◽  
Author(s):  
René Moletta ◽  
Yves Escoffier ◽  
Frédéric Ehlinger ◽  
Jean-Pierre Coudert ◽  
Jean-Pierre Leyris
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Fluidized Bed ◽  
Automatic Control System ◽  
Biological Process ◽  
Biogas Production ◽  
Fluidized Bed Reactor ◽  
On Line ◽  
Anaerobic Fluidized Bed Reactor ◽  
And Control

The aim of this study was to develop an automatic system based on selected parameters collected from the biological process to control a fluidized-bed reactor. In the first part of this study, identification of parameters sensitive to overloads was carried out with vinasses as wastewater. From these results, three parameters, considered as the most realistic for the monitoring of the reactor, were selected: pH in the liquid phase, the biogas production and its concentration of dihydrogen. These were used to develop an algorithm based on expert system principle. This automatic control system calculated the flow rate of the feeding pump in order to adjust continuously the load applied to the reactor. The system was used to monitor and control several kinds of overload in an anaerobic fluidized bed reactor, of laboratory and pilot scales. The strategy used was able to operate automatically the digesters.

Measurement and Control of Moisture in Wheat

1970 ◽  
Vol 3 (11) ◽  
pp. T181-T187 ◽  
Author(s):  
M. Brain
Keyword(s):  
Control System ◽  
Moisture Content ◽  
Automatic Control ◽  
Automatic Control System ◽  
Microwave Technique ◽  
Line Measurement ◽  
On Line ◽  
And Control ◽  
Measurement And Control ◽  
Consequent Improvement

A microwave technique for the continuous on-line measurement of moisture content in wheat is described together with an automatic control system based on these measurements. The results from a prototype installation are given and the consequent improvement of flour parameters are discussed.

Development of an automatic control system for monitoring an anaerobic fluidized-bed

1994 ◽  
Vol 29 (10-11) ◽  
pp. 289-295 ◽  
Author(s):  
F. Ehlinger ◽  
Y. Escoffier ◽  
J. P. Couderc ◽  
J. P. Leyris ◽  
R. Moletta
Keyword(s):  
Control System ◽  
Expert System ◽  
Liquid Phase ◽  
Automatic Control ◽  
Gas Phase ◽  
Fluidized Bed ◽  
Automatic Control System ◽  
Start Up ◽  
On Line ◽  
Ph Variations

The start-up procedure of a laboratory fluidized-bed was monitored by an automatic control system. Twenty six days were necessary to increase the load from 1 to 35 kg COD/m3.d. The system took into account the pH of the liquid phase, the production of gas, and the concentration of hydrogen in the gas phase. These parameters were measured by on-line sensors. According to variations of these parameters, algorithm based on a principle very close to an expert system adjusted the flow-rate of the feeding pump. The automatic control system was tested in the following situations: perturbations in the process generated by large pH variations (± 0.2 to 0.7 pH unit) and organic overloads (from 50 to 100 kg COD/m3.d). After 44 hours of overloading, CH4 and CO2 concentrations in the gas phase were very useful to detect the deviation of the reactor.

Application of PID in Controllable Pitch Propeller of a Multipurpose Ocean Tug

2013 ◽  
Vol 464 ◽  
pp. 253-257
Author(s):  
Hui Fang Chen
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
High Reliability ◽  
Control Process ◽  
Good Control ◽  
Control Performance ◽  
Hardware Configuration ◽  
Design Idea ◽  
And Control

This paper takes the automatic control system of controllable pitch propeller in a multipurpose ocean tug as an example to describe the application of the S7-200 series PLC in the control system of 4500 horse power controllable pitch propeller in detail. The principle of control system is addressed, as well as the hardware configuration, the design idea of the main software and control process. The system shows high reliability, accuracy and good control performance in practical in practical running.

The Isolator of Industrial Automatic Control System Selection and Application

2011 ◽  
Vol 301-303 ◽  
pp. 1714-1718
Author(s):  
Ji Meng Zhang ◽  
Hong Shuo Wang ◽  
Ben De Gan
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Signal Transmission ◽  
Control Process ◽  
Monitoring And Control ◽  
Process Monitoring And Control ◽  
Isolation Device ◽  
System Selection ◽  
And Control

In the automatic control system of industrial field, the production process monitoring and control process is dependent on Mutual coordination of various automation instrument, computer and corresponding actuators. The coordination is accurate or not, the key is signal transmission quality among those agencies. The application and selection of isolation device directly affect signal transmission. This paper discusses the application and choose of industrial site isolator from isolation principle, the principle and choose for isolator, commissioning and parameter selection based on practical application.

Software sensor design for COD estimation in an anaerobic fluidized bed reactor

2001 ◽  
Vol 43 (7) ◽  
pp. 115-120 ◽  
Author(s):  
C. Aubrun ◽  
D. Theilliol ◽  
J. Harmand ◽  
J. P. Steyer
Keyword(s):  
Fluidized Bed ◽  
Design Procedure ◽  
Oxygen Demand ◽  
Fluidized Bed Reactor ◽  
Unknown Input ◽  
Software Sensor ◽  
Input Estimation ◽  
Stochastic Case ◽  
On Line ◽  
Anaerobic Fluidized Bed Reactor

In this paper, a method for unknown input estimation in stochastic system is presented. A key problem in bioprocess systems is the absence, in some cases, of reliable on-line measurements for real time monitoring applications. In this paper, a software sensor for an anaerobic digester is presented. Unmeasured components of the influent are estimated from available on-line measurements. Unknown input Kalman filter is discussed to estimate the state and unknown input of the process. First, the theory of unknown inputs optimal filtering in the stochastic case is exposed and a design procedure is proposed. The observer is applied to an anaerobic fluidized bed reactor to estimate the variations in Chemical Oxygen Demand (COD) concentration and experimental results are presented.

Design of the Visualization Automatic Control System on the LPG Shuttle Kiln

2013 ◽  
Vol 670 ◽  
pp. 26-30
Author(s):  
X.J. Wang ◽  
X.G. Fu
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Control Strategy ◽  
Visualization System ◽  
Temperature Transducer ◽  
Machine Interface ◽  
Man Machine Interface ◽  
Intelligence Control ◽  
And Control

By the design of the visualization system of the LPG shuttle kiln, the friendly man-machine interface is achieved, which is helpful for the change, expansion and upgrade of the system. It is studied that the general schemes of the visualization automatic control system of the LPG shuttle kiln in this article. The choice of the hardware devices, especially the system nucleus units including temperature transducer, A/D or D/A intelligent module, RS232/485 converter, relay, actuator, etc, and the connection and control strategy of the hardware of the control system, is analyzed emphatically. A/D or D/A intelligence module, RS232/485 converter, relay, actuator, the joint and control strategy of the hardware of the control system, etc. With the widely application of the intelligence control system, the foreground of the visualization system of the shuttle kiln will be better and better.

Hybrid Automatic Control System of the Cascade of Centrifugal Extractors

2015 ◽  
Vol 1084 ◽  
pp. 661-665
Author(s):  
Ekaterina P. Zelenetskaya ◽  
Alexey G. Goryunov
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Human Factor ◽  
Current System ◽  
Neuro Fuzzy ◽  
Advanced Control ◽  
On Line ◽  
Negative Impacts

The paper provides a control system of the cascade of centrifugal extractors. This system is based on a conventional PID controller with elements of neuro-fuzzy logic for on-line tuning system. Neural networks used with fuzzy logic in an automatic control system allowed minimizing the negative impacts of human factor on the purification processes of uranium concentrates. The current system ensures the advanced control of a cascade and stabilization of the uranium concentration at the permissible industrial levels.

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