scholarly journals Centrifugal compressor anti-surge control system modelling

2022 ◽  
Vol 12 (2) ◽  
pp. 1419
Author(s):  
Nurlan Batayev ◽  
Batyrbek Suleimenov ◽  
Sagira Batayeva
Keyword(s):  
Control System ◽  
Natural Gas ◽  
Centrifugal Compressor ◽  
Block Diagram ◽  
System Modelling ◽  
Energy Balancing ◽  
Control Block ◽  
Gas Compression ◽  
Surge Control ◽  
Surge Protection

<span>From the middle of XX century, natural gas is an important mineral, widely used in the energy sector. Transportation of natural gas is carried out via gas pipeline networks and compression stations. One of the key features which need to be implemented for any centrifugal gas compressor is a surge protection. This article describes the method and develops software application intended for simulation and study of surge protection system of a centrifugal compressor used in modern gas compression stations. Within the article research method, modelling environment’s block diagram, proposed algorithms and results are described. For surge cases control and prediction, Anti-surge control block implemented which based on practical experience and centrifugal compressor theory. To avoid complicated energy balancing differential equations the volumetric flow calculation algorithm proposed which is used in combination with Redlich-Kwong equation of state. Developed software’s adequacy test performed through modeling of one-stage gas compression scheme at rated speed with comparison of parameters with reference commercial software and verification of the anti-surge control system.</span>

Variance in Compressor Turndown When Implementing Surge Control Fallback Strategies

2020 ◽  
Author(s):  
Sean W. Garceau
Keyword(s):  
Control System ◽  
Specific Gravity ◽  
Pressure Ratio ◽  
Compressor Pressure Ratio ◽  
Performance Map ◽  
Prevention System ◽  
Compressor Surge ◽  
Surge Control ◽  
Compressor Performance ◽  
Surge Protection

Abstract A centrifugal compressor surge prevention system is used to protect a compressor from surging while in operation. When using an invariant coordinate system for the compressor performance map within the surge protection system, reduced head versus reduced flow, surge control fallback strategies can be implemented within the control system to maintain operation of the compressor when instrumentation fails without placing the unit into a surge event, increasing unit availability. This paper reviews the different fallback strategies that can be implemented based on the function of the instrumentation that faulted and determine the variance between the calculated and actual turndown when different fallback strategies are active. Depending on the fallback strategy implemented, additional turndown margin may be required to ensure compressor surge is prevented by the surge prevention control system. This paper also reviews how the specific gravity, compressor pressure ratio, and compressor flow impact the variance between actual and calculated turndown when a given fallback strategy is active. Knowing the variance in the turndown allows the operator of the compressor to correctly select the desired fallback strategies and determine the needed control margin to safety operate the compressor without process disruptions. Several recommendations are outlined in the paper.

Recycle Dynamics During Centrifugal Compressor ESD, Start-Up and Surge Control

1996 ◽  
Author(s):  
K. K. Botros ◽  
B. J. Jones ◽  
D. J. Richards
Keyword(s):  
Centrifugal Compressor ◽  
Gas Flow ◽  
Check Valve ◽  
Control Flow ◽  
System Capacity ◽  
Laboratory Model ◽  
Closing Time ◽  
Start Up ◽  
Surge Control ◽  
Surge Protection

Recycle systems are important components in the operation of centrifugal compressor stations. They are essential during a start-up operation, for surge protection and for emergency shutdown (ESD). These operations are inherently dynamic where interactions between equipment, control and gas flow occur in a complex manner with the associated risk of compressor surge. Of particular importance are the effects of recycle system capacity, the recycle valve characteristics, check valve dynamic behavior, piping geometry and capacitance around the compressor unit, and the performance characteristics of the centrifugal compressor itself. This paper presents numerical results of the effects of some of these parameters on surge control, ESD and unit startup. These parameters are: i) The effects of damping the surge control flow signal in an attempt to suppress the signal noise, on the integrity of the surge control system, ii) The effects of recycle valve characteristics, stroke time and valve capacity on ESD, iii) The effects of recycle line size on ESD and iv) The effects of the recycle valve closing time (or rate) on the startup operation, with the intent of shortening this time to minimum for environmental reasons. Results were obtained from the solution of the pertinent dynamic equations describing the gas and equipment dynamics which has been verified against field and laboratory measurements. The examples presented in this paper were applied to a 24 MW natural gas compressor station on the NOVA Gas Transmission system, and to a scale-down laboratory model. Influence of other parameters from this investigation were published elsewhere and are cited in the reference section.

scholarly journals Design of a mechatronic unit for application of coats of adhesive

2019 ◽  
Vol 254 ◽  
pp. 01019 ◽  
Author(s):  
Aleksandra Fierek ◽  
Ireneusz Malujda ◽  
Krzysztof Talaśka
Keyword(s):  
Control System ◽  
System Design ◽  
Structural Design ◽  
Block Diagram ◽  
Control System Design ◽  
Mechatronic System ◽  
Control Block ◽  
Structural Joints ◽  
System Components ◽  
And Control

This paper presents the chosen structural design and confirms the need of a mechatronic system for application of adhesive on parts of seating systems for public transport vehicles. The design assumptions concerning the mechanical part of the machine and control system design are given. The engineering calculations for the chosen structural joints are described. The chosen driving systems are presented and the method for removing excess adhesive is proposed. The control system design is described is described towards the end of this paper. Information is given on the control block diagram which was used for selecting the system components. PLC, motor controllers and the associated sensors are specified. Conclusions are presented at the end of this paper.

Study of the Distributed Ground-Tunnel Pressure Measurement and Control Method

2011 ◽  
Vol 110-116 ◽  
pp. 1131-1136 ◽  
Author(s):  
Hong Liang Wang ◽  
Hao Bin Dong ◽  
Liang Hua He ◽  
Xiao Qi Zhuang
Keyword(s):  
Control System ◽  
Experimental Test ◽  
Control Strategy ◽  
Pressure Measurement ◽  
Control Method ◽  
Block Diagram ◽  
Control Block ◽  
Measurement And Control System ◽  
And Control ◽  
Measurement And Control

As the single ground environment and correction circuits of current pressure measurement and control system are too complicated to increase its test precision, the distributed ground - tunnel pressure measurement and control method is proposed.The paper focused on analyzing the idea of control strategy, describing the algorithm, principle, and other methods. Then main to deduce the relevant operations formula, give a detailed control block diagram. Finally, in order to detect the effect, the experimental test and simulation were carried out and then analyzing the results. Simulation is done to show the efficiency and feasibility of proposed approach.

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