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No single technology offers the best solution to all liquids recovery applications. PETROGAS offers the client a choice of Lean Oil Absorption, Refrigeration or Turboexpander. The best choice depends upon reason for liquids recovery, gas analysis, gas flow rate, pressure, recovery efficiency, required composition of processed gas, composition of recovered liquids, etc. PETROGAS can help you determine the most cost-effective system for your application.
RICH OIL is sent to a STRIPPER where the absorbed vapors are removed by heating the RICH OIL, vaporizing the absorbed vapors. The rich oil is, thus, regenerated as lean oil and recycled to the ABSORBER to complete the process loop. The vaporized vapors are liquefied and transferred to storage. PETROGAS Absorption Systems are designed to operate continuously, or intermittently, in a fully automatic mode. PETROGAS offers a basic system, with options to allow each unit to be customized to meet your unique specifications at a fraction of the cost of a custom designed and fabricated system. PETROGAS systems have proven superior efficiency in the recovery of hydrocarbons and chemicals from vapor streams. PETROGAS Absorption Systems are supplied as complete factory package units, including instrumentation, piping and electrical, on a structural skid.
PETROGAS has been a leader in Cryogenic Refrigeration since 1975. PETROGAS Refrigeration Systems are designed to operate continuously, or intermittently, in a fully automatic mode. The high performance refrigeration system has the lowest energy consumption in the industry. Reciprocating, Screw, or Rotary Compressors, PETROGAS has designed and assembled them all. PETROGAS refrigeration systems are available for all your needs with temperature ranges down to –300°F and capacities to 1000 HP. PETROGAS systems have proven their superior efficiency in all types of hydrocarbon and chemical applications.
Cryogenic chilling in the PETROGAS Model TE System utilizes a TURBOEXPANDER which replaces the Joule-Thompson expansion valve in a conventional refrigeration system. The expansion valve is adiabatic, while a turbine, taking work out of the expansion makes it isentropic. Isentropic expansion allows for a lower temperature of the expanded refrigerant at the same pressure reduction. The more efficient turboexpansion cycle allows the use of aliphatic hydrocarbons, such as ethane, as a refrigerant. In the Model TE series, a gas turbine with a shaft connecting it to a single stage gas compressor is known as a TURBOEXPANDER, in which a high pressure refrigerant gas flows into the gas turbine, expanding across the turbine blades, rotating a shaft and cooling through the isentropic gas expansion to a cryogenic temperature of less than -100°F. The existing low pressure, cryogenic temperature gas is used to cool the air/vapor mixture to a temperature of -100°F, condensing the contained vapors.
The transfer of heat from the air/vapor mixture, raises the
temperature of the refrigerant gas, which then enters the compressor side of the
TURBOEXPANDER, partially recompressing the refrigerant gas to the inlet design pressure of
the gas turbine, completing the cycle. |
LEAN OIL ABSORPTION
A gas with hydrocarbon vapors enters
the bottom of an ABSORBER column and flows upward contacting the counter-flowing LEAN OIL
system. The LEAN OIL preferentially absorbs the vapors from the gas, becoming
ENRICHED OIL. 
The chilling of vapors to condensing temperatures has long been a
common means of vapor recovery.
The TURBOEXPANDER is able to cool a gas to cryogenic temperatures
using 30%-60% less compressor horsepower than is required for conventional cascade
type refrigeration systems.