scholarly journals Impact of Various Feed Properties on the Performance of a Control System for a Multiple Dividing Wall Column Pilot Plant

2021 ◽  
Vol 5 (2) ◽  
pp. 29
Author(s):  
Ulrich Preißinger ◽  
Goran Lukač ◽  
Igor Dejanović ◽  
Thomas Grützner
Keyword(s):  
Control System ◽  
Dynamic Simulation ◽  
Pilot Plant ◽  
Suboptimal Control ◽  
Stable Operation ◽  
Control Structures ◽  
Dividing Wall Column ◽  
Column Design

Despite the attractive savings potential of multiple Dividing Wall Columns (mDWC), there are no reports in the open literature of an existing application so far. In this perspective, the control of mDWCs has been a rather little-investigated field. Pilot plants are a necessary step needed to further expand the application window of this sustainable distillation technology. This contribution aimed to show that mDWCs are sufficiently flexible, providing stable operation, even with suboptimal control structures arising from design limitations imposed by equipment. For this purpose, the pilot column design was assessed using dynamic simulation to evaluate its operability in case of different disturbances as well as different feed mixtures. The results showed that, in all cases, the column could be stabilized and product purities maintained. This suggests that even complex configurations such as mDWCs offer sufficient amount of flexibility to allow for the application of one design in different services.

Expert control for a stable operation of a partial nitrification system to treat highly concentrated ammonium wastewater

2009 ◽  
Vol 60 (5) ◽  
pp. 1191-1199 ◽  
Author(s):  
Irene Jubany ◽  
Julián Carrera ◽  
Javier Lafuente ◽  
Juan Antonio Baeza
Keyword(s):  
Control System ◽  
Pilot Plant ◽  
Control Strategies ◽  
Biomass Concentration ◽  
High Strength ◽  
Partial Nitrification ◽  
Stable Operation ◽  
Ammonium Oxidation ◽  
Expert Control ◽  
Biomass Activity

This work presents the application of expert control strategies for a successful and stable operation of partial nitrification. A high-strength ammonium wastewater was treated in a continuous pilot plant with a configuration of three reactors in series plus a settler. The system was operated at mild temperature (around 25°C) and at high sludge retention time to obtain a significant nitrifying biomass concentration. The implemented control system with expert supervisory rules provided a stable and robust operation of the partial nitrification system even when the pilot plant was subjected to several disturbances as change in influent concentration, failure of aeration in one reactor and operation with variable biomass concentration. The control system was based on local feedback control loops for dissolved oxygen and pH with proper setpoints for nitrite oxidizing bacteria (NOB) inhibition and an inflow control loop based on Oxygen Uptake Rate (OUR) measurements, which allowed working at the current maximum ammonium oxidation capacity. Two additional expert rules were implemented for automatically determine the required OUR setpoint in accordance with the biomass activity and to produce a fast load decrease when a system overload was detected.

Application of Dynamic Simulation to CAES G/T Control System Development

2002 ◽  
Author(s):  
Katsuyuki Takahashi ◽  
Tomoshige Yasuda ◽  
Makoto Endoh ◽  
Masahiro Kurosaki
Keyword(s):  
Control System ◽  
Dynamic Simulation ◽  
Pilot Plant ◽  
Power Plants ◽  
Risk Mitigation ◽  
System Development ◽  
Electronic Control Unit ◽  
Control Unit ◽  
Control Logic ◽  
Load Leveling

This paper presents extensive use of dynamic simulation of Compressed Air Energy Storage Gas Turbine (CAES G/T) for control system design, control logic development and software validation which significantly reduced development time and cost of the control system and contributed to successful demonstration of a 2,000 kW pilot plant with technical risk mitigation. The CAES G/T is one of the electrical load leveling power plants. High-pressure air compressed by motor-driven compressors in nighttime and stored in underground reservoir is provided to the CAES G/T for power generation in day time. Based on extensive simulation, we finalized control system configuration and control component specification. Developed control logic was tested by comprehensive simulation tests covering almost all expected operations such as start, acceleration, load application and rejection, recuperator active/non-active mode transfer etc. Finally, we conducted hardware in the loop simulation test to assure Electronic Control Unit (ECU) function and performance. An actual ECU and a real time simulator with the CAES G/T model, sensor models and actuator models were used in this test. Tests at a 2,000 kW pilot plant started in January 2001. The full load rejection test showed 9.9% overspeed of the rotor, which is 1% less than the simulation predicted value and within the regulation limit. Only minor control parameter and logic adjustments were required during the tests. Regular operation of the plant started in June 2001.

Design and Experimental Implementation of Longitudinal Control for a Platoon of Automated Vehicles

1998 ◽  
Vol 122 (3) ◽  
pp. 470-476 ◽  
Author(s):  
R. Rajamani ◽  
S. B. Choi ◽  
B. K. Law ◽  
J. K. Hedrick ◽  
R. Prohaska ◽  
...  
Keyword(s):  
Control System ◽  
Torque Converter ◽  
Stable Operation ◽  
Automated Vehicles ◽  
Longitudinal Control ◽  
The Public ◽  
Automated Highways ◽  
Experimental Implementation ◽  
Special Challenge ◽  
Upper Level

This paper presents the design and experimental implementation of a longitudinal control system for the operation of automated vehicles in platoons. The control system on each vehicle is designed to have a hierarchical structure and consists of an upper level controller and a lower level controller. The upper controller determines the desired acceleration for each vehicle in the platoon so as to maintain safe string-stable operation even at very small intervehicle spacing. The lower controller utilizes vehicle-specific parameters and determines the throttle and/or brake commands required to track the desired acceleration. A special challenge handled in the design of the lower level controller is low-speed operation that involves gear changes and torque converter dynamics. The paper also presents the design of longitudinal intra-platoon maneuvers that are required in order to allow any car in the platoon to make an exit. The paper presents extensive experimental results from the public NAHSC demonstration of automated highways conducted in August 1997 at San Diego, California. The demonstration included an eight-car platoon operating continuously over several weeks with passenger rides given to over a thousand visitors. The maneuvers demonstrated included starting the automated vehicles from complete rest, accelerating to cruising speed, allowing any vehicle to exit from the platoon, allowing new vehicles to join the platoon and bringing the platoon to a complete stop at the end of the highway. [S0022-0434(00)01903-1]

Coal-Conveying Control System for the Pressure of Coal Waste Heat Power Generation Based on PLC

2013 ◽  
Vol 336-338 ◽  
pp. 681-685
Author(s):  
Li Jun Zhao ◽  
Ying Feng Chen
Keyword(s):  
Control System ◽  
Waste Heat ◽  
Computer Control ◽  
System Structure ◽  
Utilization Rate ◽  
Coal Waste ◽  
Stable Operation ◽  
Efficient Operation ◽  
Actual Operation ◽  
One Year

This paper constructs a coal-conveying control system based on programmable logic controller (PLC), which is applied to the residual heat and pressure integrated energy-saving technological transformation projects, and realizes the performance of security, reliable and efficient operation. This control system consists of the PLC control system, computer control system and industrial television monitoring system. After more than one year of actual operation shows that the system structure is reasonable, reliable operation, at the same time, reduce labor intensity, improve the utilization rate of equipment, the stable operation also provides a practical reference for other similar projects.

Study of Dynamic Simulation on Driving System and Modeling Motor for Electric Drive Application of Armored Vehicles

2014 ◽  
Vol 543-547 ◽  
pp. 286-290
Author(s):  
Zi Li Liao ◽  
Gui Bing Yang ◽  
Jia Qi Li ◽  
Ming Zhao
Keyword(s):  
Control System ◽  
Dynamic Simulation ◽  
Electric Drive ◽  
Mathematic Model ◽  
Permanent Magnet Motor ◽  
Driving System ◽  
Electric Drive System ◽  
Interior Permanent Magnet ◽  
Armored Vehicle ◽  
Interior Permanent Magnet Motor

Establish an IPM(Interior Permanent Magnet) motor mathematic model based on saturated inductance parameters. This model aimed at the traction motor of electric drive system of a certain armored vehicle. Driving control system was established on SIMULINK platform, and the consequence was analyzed.

A synergy-column envelope meshing pair profile for single screw compressors

2018 ◽  
Vol 233 (4) ◽  
pp. 1383-1391 ◽  
Author(s):  
Feilong Liu ◽  
Junhao Feng ◽  
Jia Xie ◽  
Quanke Feng ◽  
Martijn Van Den Broek ◽  
...  
Keyword(s):  
Design Method ◽  
Optimal Combination ◽  
Stable Operation ◽  
Single Screw ◽  
Tooth Width ◽  
Operational Life ◽  
Column Design ◽  
Manufacturing Methods ◽  
Operation Results ◽  
The Relationship

Multi-column envelope engaging couples have been proposed for single screw compressors to reduce the friction and prolong the operational life. However, little is mentioned about the relationship between columns at opposite sides of the star-wheel teeth. An imbalance in the lubricant film forces would appear and influence the lubrication between the tooth and the groove. During a real design process, it is necessary to try several times for each different type of compressor to find the optimal combination of columns. In part, due to the large number of columns, it also makes both manufacturing processing and product testing difficult. In this paper, a synergy-column design method and its related manufacturing methods are presented. The locations and relationships of the designed columns can be prescribed by given the tooth width. Manufacturing of the rotor and star-wheel shows the new design method can be more efficient through processing. The stable operation results prove that the synergy-column envelope meshing pair can solve the star-wheel’s wear-out problem.

scholarly journals Control Structures Evaluation for a Salt Extractive Distillation Pilot Plant: Application to Bio-Ethanol Dehydration

Energies ◽  
2017 ◽  
Vol 10 (9) ◽  
pp. 1276 ◽  
Author(s):  
Carlos Cantero ◽  
Guadalupe Lopez ◽  
Victor Alvarado ◽  
Ricardo Jimenez ◽  
Jesse Morales ◽  
...  
Keyword(s):  
Pilot Plant ◽  
Extractive Distillation ◽  
Ethanol Dehydration ◽  
Control Structures

Implementation of an advanced hybrid MPC–PID control system using PAT tools into a direct compaction continuous pharmaceutical tablet manufacturing pilot plant

2014 ◽  
Vol 473 (1-2) ◽  
pp. 38-54 ◽  
Author(s):  
Ravendra Singh ◽  
Abhishek Sahay ◽  
Krizia M. Karry ◽  
Fernando Muzzio ◽  
Marianthi Ierapetritou ◽  
...  
Keyword(s):  
Control System ◽  
Pid Control ◽  
Pilot Plant ◽  
Pharmaceutical Tablet ◽  
Tablet Manufacturing

System Identification and Lateral Dynamics of the Active Tilt-Controlled Electric Three Wheeler

2020 ◽  
Vol 142 (9) ◽  
Author(s):  
Jigneshsinh Sindha ◽  
Basab Chakraborty ◽  
Debashish Chakravarty
Keyword(s):  
Control System ◽  
System Identification ◽  
Load Transfer ◽  
Lateral Acceleration ◽  
Stable Operation ◽  
Technological Advancement ◽  
Track Width ◽  
Lateral Dynamics ◽  
Vehicle Trajectory ◽  
The Impact

Abstract Active tilt control system (ATC) is considered to be a prominent technological advancement in the three wheelers (3Ws), which improves the drive and comfort capabilities of 3W, leading to additional benefits of excellent maneuverability and small track width. An experimental prototype along with its simulation model is developed, to study the impact of the tilt actuation control system (TAS) and active steer (AS) system on the overall drive experience and stability improvement. A steering direct tilt control (SDTC) strategy is implemented on the vehicle, which allows stable operation of the system during the entire drive range. A transfer function (TF) of the TAS is estimated from the measurements on the prototype using the system identification tool. The derived TF is then utilized to investigate the response of the complete vehicle in terms of vehicle trajectory, perceived acceleration and load transfer across the rear wheels during the double lane change (DLC) and constant turn maneuvers. The results of the analysis indicate that the perceived acceleration felt by the driver is up to 45% less than the lateral acceleration along with up to 36% reduction in load transfer across the rear wheels.

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