EOR Once Through Steam Generator
100 MMBTU/Hr Once Through Steam Generator
Cyclic Steam Injection Pilot, Mexico (25 MMBTU)
EN-FAB Once Through Steam Generators (100 MMBTU)
EN-FAB Steam Generators (50 MMBTU) Omimex Columbia
The EN-FAB Steam Generator is a "Once Through" forced circulation type. The unit may be designed to supply wet, saturated or superheated steam discharge conditions. Pressure ratings will be supplied to customer's specifications and are normally furnished in 1000, 1500, or 2500 PSIG working pressure.
The horizontal design is utilized for easier transportation, field installation and repair, use of either gas or liquid fuels, and elimination of vertical flow and entrained liquid fallback problems associated with vertical type heaters.
The horizontal serpentine straight tube design simplifies tube and refractory repair if required as compared to helical wound or vertical type installations. Drainage of the heater for non-operating periods in freezing weather is simplified in the single tube serpentine design.
Feedwater Pump and Prime Mover
The feedwater pump is normally a positive displacement pump to provide the necessary feedwater pressure and flow rate required for the generator.
This is normally a double pipe hair pin type heat exchanger used to raise the feedwater temperature above the flue gas dew point to prevent condensation of water in the flue gas and the resulting acid corrosion and deposits.
The radiant section is cylindrical with horizontal tubes transposed around the radiant section for equalized heat pick up. The tubes are supported with high alloy tube supports and are free to expand with temperature changes. The radiant section also provides large furnace volume for flexibility in combustion fuel and firing changes. The heat transfer surface in the radiant section normally picks up about 60% to 65% of the overall heat transfer duty. The refractory lined wall provides for reflective heat transfer to the tubes and insulation to reduce heat loss through the chamber wall.
The convection section is fabricated from both bare and extended surface tubes. Flue gases from the radiant section enters the convective section flowing across the bare or shock tubes first and then across the extended surface tubes. The convective section normally picks up 35% of 40%, or more, of the overall heat transfer duty. These convective sections are designed to give the desired efficiencies. Mechanically they are designed for easy tube replacement and maintenance. Side covers may be supplied with lay down doors for cleaning if desired.
Burners may be supplied for natural gas, butane, propane, or liquid fuels. Liquid fuels include crude oil. Heavy viscous oils need preheating to provide a viscosity at the burner of 100 to 150 SSU's at the burner nozzle.
The feedwater flow rate is controlled by the generator discharge pressure. The burner firing rate is controlled by a metered flow rate signal. This allows the generator to be adjusted to give the desired steam discharge quality. Standard and optional safety limit devices allow unattended operation of the Generator. Certain limits are standard with annunciator lights to indicate reason of shutdown. Other limits are optional along with additional annunciator devices.
Water Treatment for Steam Generation
Successful operation of steam generation equipment depends primarily upon a good source of feedwater combined with an effective water treating system.
Quality of steam generator feedwater is of critical importance in steam injection projects. Field experience indicates that most steamer downtime is caused by water treating problems.
Although a once-through steam generators can tolerate relatively high amounts of total dissolved solids (TDS), strict adherence to feedwater quality requirements is essential. Operating outside a design quality range can result in scale deposition in the water sides of steam generator tubes.
Deposition of scale reduces heat transfer, reduces flow though the tubes, and results in tube failure through formation of localized hot spots on the tube walls. Corrosive components of the water also may cause tube failure. Therefore, it is imperative that the feedwater be properly conditioned to minimize downtime and costly maintenance.
The U.S. Department of Energy in their publication no. NIPER-580 recognized EN-FAB, Inc. as the only company to provide "Turnkey Steam Distribution System" for thermal oil recovery. EN-FAB, Inc. has also been recognized by the DOE as a supplier of Oil Field Steam Generators, Steam Quality Measurement Systems, Surface Production Equipment, Feedwater Treatment Equipment, Produced Water Reclamation Plants, Chemical Feed Systems, Multi-Media Filters and Deaerators.
EN-FAB's Enhanced Oil Recovery equipment can be found in Brazil, Canada, China, Colombia, Ecuador, Mexico, Oman, Russia, Trinidad and the United States.
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