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The portability of the Mini-Plant enables it to be quickly and inexpensively installed and moved when no longer needed. The operating pressures may vary from ambient to 1000 psig.
The process flow is similar for all size units. The incoming gas/vapor stream enters an Interchanger, where the gas/vapor stream is pre-cooled by the cold outlet gas. A chemical injection pump injects atomized methanol into the gas vapor stream to prevent the formation of ice. The gas/vapor stream passes through a Chiller where the temperature of the gas/vapor stream is lowered to that required to condense the designated vapors from the gas by indirect contact with a refrigerant. The gas and condensed vapors next flow from the Chiller into a Separator, where the condensed vapors are collected in the bottom. The gas, free of the vapors, flows from the Separator, passes through the Interchanger and exits the unit. The recovered liquids flow, or are pumped, from the bottom of the Separator to storage. If control of the recovered liquid vapor pressure and/or composition is required, a Stabilizer may be added to split the lighter components (ethane, propane, and butane) from the heavier gasoline. The recovered liquids flow from the Separator into the Stabilizer Column. Control of the Stabilizer Column's operating pressure and temperature results in the distillation of the undesired lighter components from the heavier components.
Temperature control is achieved by the use of an electric or natural gas fired reboiler. The heavier components flow from the Stabilizer Column bottom to storage. The lighter components flow overhead as vapors for use as a fuel or re-injected into the natural gas stream.
All PETROGAS Refrigeration Systems are skid mounted, completely factory assembled, including all required equipment, instrumentation, piping and electrical components. The unit is charged with refrigerant and test run prior to shipment.
The PETROGAS Refrigeration System can usually be installed in less than 1 day. Installation requires unloading of the unit and setting it on a level, stable foundation. The skid is designed to structurally support the unit, and to equally distribute the weight of the skid components. No piers or special foundations are required. The upper section of the Stabilizer, removed for shipment, is installed by bolting together body flanges. Gas inlet and outlet lines and a line to the product storage tank, need to be connected. Purchaser will provide the designated electric power to the control panel.
A PETROGAS factory trained technician, if required, can be provided to supervise the initial startup, adjustment of the equipment, and the training of operators at an additional cost. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The PETROGAS
Refrigeration Type Liquids Recovery Mini-Plant is a modular process skid designed to
condense natural gas liquids at temperatures as low as -40°F mechanically using
commercial refrigerants.
PROCESS
DESIGN
INSTALLATION