Abstract
The capacity control system of reciprocating compressor has great significance for the contribution of energy conservation and emission reduction. The parameters of the actuator and hydraulic system within a reciprocating compressor stepless capacity control system play a decisive role in its control accuracy, mechanical reliability, and mechanical security. The actuators and hydraulic system parameters of the same stage are in conflict with each other. Therefore, the actuator and the multistage reciprocating compressor are studied here, specifically through multiobjective optimization using the Nondominated Sorting Genetic Algorithm (NSGA)-II. The multiobjective optimization design was performed on a two-dimensional (2D) reciprocating compressor test bench. When the spring stiffness of the first stage spring was 27358 N m−1, the spring stiffness of the second stage spring was 23315 N m−1, the inlet oil pressure was 296.62 N, the impact velocity of ejection was 0.4215 m s−1, and the total indicated power deviation was 12.05 kW; the objective functions were optimized. Compared with traditional parameters, the inlet oil pressure, spring stiffness, and impact velocity were all reduced. This parameter optimization design lays the foundations for global optimization designs for stepless capacity control systems.
Highlights
Reciprocating compressors are widely used in the petroleum, chemical, chemical fertilizer, natural gas, transportation, and other industrial fields
Hydraulic or pneumatic actuators are used to drive the unloader so that the suction valve is forced open by the unloader during the compression stroke. e gas flows back through the suction valve to the suction inlet, realizing the function of adjusting the compressor displacement. e regulation method can be divided into two approaches: full stroke pressure-open suction valve regulation and partial stroke pressure-open suction valve regulation
The key parameters of the actuator and the hydraulic system in a multistage reciprocating compressor stepless capacity control system are mutually suppressed and contradictory. e parameters of the actuator and the hydraulic system at the same stage can be in conflict with each other
Summary
Reciprocating compressors are widely used in the petroleum, chemical, chemical fertilizer, natural gas, transportation, and other industrial fields. A capacity-regulation system for a reciprocating refrigeration compressor, based on a novel rotary control valve, was proposed and designed by Li et al [3]. E influence of the capacity control system’s parameters on the reciprocating compressor is analysed here, and a simple optimal design is conducted. The mutual inhibitions and the contradictory relationships among the multiple parameters and objectives, such as the hydraulic pressure, spring stiffness, impact velocity of ejection, and regulating effect, have not yet been considered. Obtaining the optimal solutions of these problems and ensuring high efficiency and safe operation for stepless capacity control systems are extremely critical for these multiple conflicting objectives. The key parameters of a reciprocating compressor stepless capacity control system are treated as being mutually suppressed and contradictory, and as such, traditional methods cannot obtain the optimal solutions of multiple parameters.
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