Reciprocating Compressor Piping System Air Dynamics Simulation And Stress Analysis

Reciprocating compressor as an important device of conveying, compressed gas in petrochemical chemical industry, metallurgy, energy and other fields has a very wide application. However, due to improper design defects, manufacturing error, installation, and many other reasons, caused by the reciprocating compressor vibration of pipeline system is attached and leakage in the working process of the compressor running. Therefore, studying the cause for the vibration of reciprocating compressor pipe network and the vibration reduction method has an important meaning. In this paper, both Reciprocating compressor air flow pulsation and the structure resonance which are the two important cause of reciprocating compressor pipe network vibration is studied. Combined with finite element analysis method gas pulsation characteristics of part of pipe fittings has carried on the detailed discussion. Combined with the theoretical basis, one chemical plant equipment’s vibration problem was studied and achieved good effect.This paper is support by the National Key Basic Research Development Program (2012CB026004). The main research content of this article is divided into two:The first part is reciprocating air compressor piping system dynamics simulation research, The article content to one dimensional unsteady ever-flowing wave equation and the fluid dynamics CFD simulation, combined with experimental verification,and discusses the influence of flow pulsation characteristics which cased by the straight pipe, elbow, valve, etc. And sumed up the propagation law of the pressure pulsation in straight pipe, elbow and butterfly valve. In chapter 4, the propagation characteristics of pressure pulsation in the straight pipe has been developed and the air pulse propagation equation under both damped and undamped situation have been studied. In chapter 5, the propagation characteristics of pressure pulsation in elbow when change the bend corner radius, the loction of the elbow and elbow structure have been founded, and a airflow pulsation transfer matrix of elbow has been made. In the main time, this chapter also put forward a method of reduc pressure pulsation which is change the normal elbow into one appropriate size ball. Several numerical simulations have been made, and this method is found feasible. In chapter 5, according the different influence of the airflow pulsation, valves has been divided into two categories, on is represented by btterfly valve and the other is represented by gobe valve, the propagation characteristics of pressure pulsation in both valve have been studied.The second part is the reciprocating compressor and its subsidiary pipeline system dynamics analysis and engineering case study. This part is a combination of wave theory and the dynamics of the complex network analysis. The study was carried out by one PSA device’s reciprocating compressor, acuum pumps and their pipe network. A vibration reduction scheme is proposed and adopted. After the rectification the vibration of the device is decreased obviously.In this paper, the first concentrate focus on the propagation characteristics of pressure pulsation in different pipe fittings. The reasout of this part can be meaningful to the new pipe system and new vibration reduction method development. The seconde concentrate basis on first concentrate’s study, and cmbined with the pipeline dynamic analysis method, successfully made a transform program in one chemical plant, verify the validity of the first article content to the engineering practice.