Research On Thermodynamic Performance Of Reciprocating Cpmpressor Gas Capacity Regulation And Gas Valve Leakage Failure

Reciprocating compressor is an important equipment to realize gas compression or transportation.It is widely used in petroleum,chemical industry,chemical fertilizer,natural gas transportation and other industrial fields.When the production demand changes,the production process needs a change in the compressor’s exhaust volume or the intake source gas volume,all require the reciprocating compressor to have an exhaust volume regulation function.Adjusting the suction valve by a hydraulic actuator is a typical adjustment method.At present,there are few analyses on the thermodynamic behavior of the reciprocating compressor gas volume adjustment conditions and coupled fault conditions.In this paper,we aim at the problem of complex and changeable internal instantaneous flow field of reciprocating compressors when adjusting the air volume.Control,set the solution parameters and fluid physical properties parameters according to the working parameters of the compressor,and then perform the transient numerical simulation of its internal flow field.Experiments and simulations were carried out for the compressor with variable discharge pressure,variable speed and spring deterioration,and the thermodynamic performance of the compressor under variable conditions was analyzed.We conducted a study on the variable load conditions of the compressor.The internal flow and thermodynamic properties are discussed in detail.The results show that the displacement of the compressor can be adjusted steplessly by controlling the closing angle of the suction valve.The quantitative relationship between the volume load of the suction valve and the closing angle of the suction valve is revealed.We also conducted a study on the coupling conditions of compressor air volume adjustment and valve leakage.The results show that the capacity load and the valve leakage rate show significantly different characteristics in the p-V diagram,which makes it easier to define suitable characteristics under varying load conditions to detect cracked or damaged reciprocating compressor valve valves.A set of relationship curves between compression work and exhaust quality was obtained,and a method for calibrating the thermal performance of the compressor was proposed using these curves.It has guiding significance for the fault diagnosis and energy consumption analysis of the gas valve leakage of reciprocating compressors.Based on this,we use Amesim to model and analyze the hydraulic actuator,and use the CFD method to explore the effect of the hydraulic actuator’s adjustment on the air volume adjustment condition and the effect on the thermodynamic performance of the compressor.And to optimize the reciprocating compressor air volume adjustment operating conditions of the actuator operating parameters,but also provide a reference for the design of control parameters of the hydraulic system.