MECHANICAL REFRIGERATION (MRU) SOLUTIONS PROVIDED BY ETI
Engineering Technology & Innovation, LLC, (ETI) provides treatment systems to process and remove heavy hydrocarbons and water from natural gases. The process equipment consists of standalone vessels and skid-mounted modules. A MRU consists of two operations: a cold separator and a refrigeration system. A regeneration system may be employed to minimize solvent costs.
The components of a mechanical refrigeration plant are: inlet separator or filter separator, exchangers, chiller and refrigeration system (compressor, condenser/air cooler, receiver, and instruments, controls, and accessories) and glycol/methanol injection. The refrigeration systems most commonly used are propane or ammonia systems, although non-CFC Freons are also used.
REASONS FOR MRU TREATMENT
Gas engines for compression or pumping require a high quality fuel gas. Fuel gases must be conditioned to lower the heating value of the gas by removing the majority of the heavy hydrocarbon components, butane and heavier nC4+. A mechanical refrigeration system is quite similar in process scope to the Joule-Thompson auto-refrigeration fuel gas treating units. The process gas stream is injected with a hydrate inhibitor such as methanol or ethylene glycol. The process gas temperature is lowered to between 0°F and -40°F. Heat exchangers conserve chilling requirements. The recovered hydrocarbon liquid is either combined with other production liquids or stabilized as LPG. To reject absorbed water, a regeneration package consisting of: heat exchangers, flash separator, particulate filter, charcoal filter, electric- or gas-fired heated glycol reboiler, glycol stripper, reflux tower, and injection pumps is utilized. A typical MRU will lower the HHV of the fuel gas to 1050 Btu/scf or less, the Methane Number, MN >65, and the butane number, NBN<4.5.
- SKID-MOUNTED MODULES
- ECONOMICAL OPERATION
- EFFICIENT OPERATION
- CLOSED SYSTEM
- UNATTENDED OPERATION
- REGENERATION OF MEG
- STAINLESS STEEL VALVE TRAYS
- MEG CIRCULATION RATES FROM A FEW
TO SEVERAL GPM FLOW
- STAINLESS STEEL MEG STRIPPING
- VENTING, INCINERATING OFF GASES
- DOESN'T REQUIRE COMPRESSION OF
- COMPACT MODULES
- MINIMAL HYDRATE INHIBITOR INVENTORY
- LOW HYDRATE INHIBITOR MAKEUP
- UP AND DOWN STREAM FILTER/COALESCING
- HEAT STABLE SALTS
- LOCAL OR REMOTE CONTROL OPTIONS
- RECTIFICATION OF STRIPPED GLYCOL