Performance Degradation Analysis and Optimization of the Stepless Capacity Regulation System for Reciprocating Compressors

Abstract

The regulating performance degradation of the stepless capacity regulation system for reciprocating compressors occurs frequently in long-term operations. It affects the safe and stable operation of the compressor seriously. The degradation mechanisms in a stepless capacity regulation system are mainly caused by valve leakage, degeneration of the reset spring of the unloader, and (or) deviation of the solenoid valve’s characteristic parameters. In this study, to research the system performance degradation mechanisms and the influence of control parameters on system behavior, a multi-subsystem mathematics model which integrates compressor, gas pipeline, buffer tank, and actuator was built. In order to calculate the rate of degradation, a load prediction model based on a modified back-propagation neural network was established. The rate of degradation can be calculated using the predicted results. In order to optimize system regulation performance, a degradation-based optimization framework was developed which determines optimum control parameter compensation to achieve a minimum degradation rate. In addition, in order to avoid over-compensation, an adaptive control parameter compensation optimization method was adopted. According to the deviation between the given load and the prediction load, the control parameter compensations are obtained adaptively. Finally, two optimization experiments are carried out to show the effectiveness of the developed framework. The optimization results illustrate the degradation rate of the system gradually returning to normal during 60s without any over-compensation.

Design of an IMCPID Optimized Neural Network for Stepless Flow Control of Reciprocating Mechinery

“…The stepless flow control system for a two-cylinder type reciprocating compressor [27] is shown in Figure 1, where r denotes the gas to be compressed and y denotes the compressed gas. In standard operating conditions, the gas satisfies the following ideal gas assumptions:…”

Stepless space-regulation of topological acoustic controller with high fault tolerance

“…continuous, and full of infinite possibilities, which greatly promotes the development of science and technology. Specifically, stepless regulation refers to the regulation method is not a jump, but any relatively smooth regulation within a range, the aspects of stepless regulation have been involved in daily life and all aspects of sophisticated technology, such as stepless regulation of compressor volume [1][2][3], stepless regulation of speed [4][5][6], stepless regulation of light [7], stepless regulation of resistance [8], stepless regulation of distance [9], stepless regulation of angle [10], stepless regulation of shape [11] and so on.…”

Quantitative Evaluation on Valve Leakage of Reciprocating Compressor Using System Characteristic Diagnosis Method

“…The valve is the core part of RC, which determines the stable and efficient operation, and it is one of the most easily damaged parts in RC. Therefore, an effective and accurate valve fault detection method can improve the operation reliability of the RC, reduce the occurrence of accidents, and reduce the downtime and cost of the RC [4,5].…”