páginas desdemarch 2015 - international
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March 2015 Vol. 159 No. 3 Vol. 159 No. 3 March 2015
New Ways to Manage Water & Wastewater
Going Natural with Boiler Room Ventilation
CCGT Steam Cycle Low-Load Ops Issues
Flex-Gen Early Performance Results
Geothermal New Zealand
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March 2015 | POWER www.powermag.com 1
ON THE COVERNational Oilwell Varco, in partnership with Oasys, offers forward osmosis systems for use in the oil and gas industry for treating exploration and production wastewaters. Forward osmosis, especially as a companion to reverse osmosis, is beginning to see use in the power industry as well. Courtesy: Oasys Water
COVER STORY: WATER & WASTEWATER22 Water and Wastewater Treatment Technology Update
Youve heard of reverse osmosis (RO), but now its being joined by a new treat-ment known as forward osmosis (FO). In addition to RO, FO, and membrane bioreac-tors, advances in membranes and zero-liquid discharge offer new options to power plants.
28 Feedwater Chemistry Meets Stainless Steel, Copper, and IronWhether you operate an older plant with a mix of piping metals or a newer one with the latest alloys, this article covers the chemistry options that operators have to minimize corrosion in a critical area of the plant.
34 Mining for Lithium in Geothermal Brine: Promising but PriceyBrine, the wastewater stream from geothermal power production, is highly corro-sive and hard on piping systems. Recently, a U.S. company developed a method that both recovers valuable minerals from that brine and makes the remaining fluid much less problematic for reinjection. Trouble is, an inability to fund the enterprise may spell the companys demise.
SPECIAL REPORT: AUXILIARY SYSTEM EFFICIENCY & RELIABILITY36 Save Power with Natural Cooling for Building Ventilation
Coal-fired power plants release a large amount of heat during the combustion pro-cess. Switching from forced to natural ventilation in the boiler building can yield potential energy savings.
38 SCR Reheat Burners Keep NOx in Spec at Low LoadsOptimal NOx removal by a selective catalytic reduction (SCR) system requires the inlet gas temperature to remain within a prescribed range. How does a baseload unit meet NOx permit limits when its cycled and SCR inlet gas temperatures dip?
FEATURES
COMBINED CYCLE GAS TURBINES
42 Protecting Steam Cycle Components During Low-Load Operation of Combined Cycle Gas Turbine Plants Know the tradeoffs when operating combined cycle plants at low loads. The solution to one problem may trigger another problem or cause actual damage to your plant.
46 Are Flexible Generation Plants Performing as Expected?Designed from the start for cycling and fast starts, the new flex generation com-bined cycle plants promised to avoid the trauma inflicted upon earlier gas plants by more aggressive operational modes. One of the earliest plants to adopt the technol-ogy reports positive results.
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