Abstract
ABSTRACT For the past eighteen months, Santa Fe Energy has successfully used sodium sulfite from scrubber waste as an oxygen scavenger in a 15,000 BWPD water plant in the Midway-Sunset Field. In using scrubber effluent as an oxygen scavenger, Santa Fe Energy has realized a $600/day cost savings from a reduction in chemical purchases for sodium sulfite (oxygen scavenger), scrubber effluent disposal costs, and vacuum truck charges, and an improvement in steam generator feedwater quality. Commercial soda ash (sodium carbonate Na2CO3) is used in the scrubbing process to remove combustion by-products during steam generation. Sulfur dioxide is the primary target of this scrubbing process, and is generated when fuel oil with high (1–2% sulfur) content is burned in the generators. The spent scrubber effluent contains between 2.3–5.5% sodium sulfite and sodium bisulfite, which can be used for oxygen scavenging in boiler feedwaters. Between 1 to 2 barrels of scrubber effluent per 1,000 bbls of water are required to remove the 4 ppm of oxygen found in Santa Fe Energy's purchased water supply and provide a 30 ppm sodium sulfite residual from the water plant. Details concerning the equipment used, installation costs, trial test, subsequent operating parameters and cost savings are provided in the discussion. Similar systems are being installed in other Santa Fe Energy water plants in the valley. Use of scrubber liquor to trim oxygen scavenging chemical consumption in our produced water systems is under evaluation.
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