Redesign of LDPE Secondary Compressor Valves to Better Tolerate Polyethylene Wax Fouling

2016 ◽  
Author(s):  
Karl Simpson ◽  
Joel Sanford ◽  
Lavon Finnefrock
Keyword(s):  
Low Density Polyethylene ◽  
Valve Design ◽  
High Discharge ◽  
Ethylene Decomposition ◽  
Process Gas ◽  
Valve Leakage ◽  
Process Fluid ◽  
Polyethylene Wax ◽  
Maintenance Personnel ◽  
Gas Recirculation

This paper discusses the redesign of valves in high-pressure reciprocating compressors used in the manufacture of Low Density Polyethylene (LDPE) resin. The compressors have Multi-poppet (MPV) style valves which are affected by LDPE wax fouling. This fouling causes the poppets to stick open leading to gas recirculation (valve leakage) and associated process fluid heating. This heating can cause the compressors to shut down on high discharge temperatures requiring operations personnel to push process gas through the valves to try to clear the waxes, or to have maintenance personnel replace the valves. Poppets sticking due to wax fouling can also result in compressor gas discharge temperatures increasing high enough to cause Ethylene decomposition (Decomp) which can cause the production line to vent to atmosphere. This paper describes analysis and testing to change the valve design from MPV, to Single-poppet (SPV) style valves to reduce the effects of wax fouling.

Perspectives and Experience With Wet Gas Compression

2016 ◽  
Author(s):  
Grant O. Musgrove ◽  
Melissa A. Poerner ◽  
Griffin Beck ◽  
Rainer Kurz ◽  
Gary Bourn
Keyword(s):  
Oil And Gas ◽  
Liquid Mixtures ◽  
General Definition ◽  
Limited Information ◽  
Process Gas ◽  
Wet Gas ◽  
Gas Compression ◽  
Process Fluid ◽  
Separation Equipment ◽  
Definition Of

In oil and gas applications, gas-liquid mixtures of a process fluid are commonplace and the phases of the mixtures are separated upstream of pump or compressor machinery. Considering compressors, the separation of phases is important because the liquid causes the compressor to operate significantly different than with dry to affect the range, performance, and durability of the machine. Even with separation equipment, liquid can be ingested in a compressor by liquid carryover from the separator or condensation of the process gas. Additionally, there is no single definition of what is considered a wet gas. In this paper, the definition of wet gas from multiple applications is reviewed and a general definition for wet gas is formulated. The effects of wet gas on reciprocating, screw-type, and centrifugal compressors are reviewed to provide insight into how their operation is affected. The limited information for screw compressors is supplemented with multiphase effects in screw pumps.

scholarly journals Analysis of impact of EGR valve construction on the exhaust gas flow parameters in the engine

2013 ◽  
Vol 154 (3) ◽  
pp. 79-85
Author(s):  
Agata LENC-BROL ◽  
Jarosław MAMALA
Keyword(s):  
Diesel Engine ◽  
Gas Flow ◽  
Flow Characteristics ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Simulation Studies ◽  
Valve Design ◽  
Flow Parameters ◽  
Recirculation System ◽  
Gas Recirculation

In this paper an analysis of the EGR valve design impact, in particular the outlet diameter, on the gasflow parameters in diesel engine (Z1505) exhaust gas recirculation system ofZetor tractor was made. For this purpose the experimental and simulation studies of gasflow through the valve were carried out. The simulations using Fluent were made. Also distribution of the pressure and velocity vectors in the area of the valve outflow was presented. Analysis of the phenomena occurring in the exhaust area of the EGR valve was made. Also influence of the outlet diameter on the flow characteristics of the EGR valve was determined.

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