POWER [March, 15 2007]

Cover Stories

Reclaimed cooling water's impact on surface condensers and heat exchangers

Because water is more precious than power in many regions of the U.S., plant designers are more frequently specifying the use of treated wastewater for plant cooling. Using "gray water" poses its own challenges for critical service equipment like condensers and heat exchangers. Some problems—like corrosion—are familiar, whereas others are rare. But so far, none has been a match for the ingenuity of multidisciplinary design experts.

Features

Balancing power and steam demand in combined-cycle cogeneration plants

The 2005 amendment to the 1978 Public Utility Regulatory Policies Act created some unique challenges for the design of cogeneration plants in general and combined-cycle cogeneration plants in particular. Because utilities are no longer obligated to buy electricity at "avoided cost" from qualifying facilities, plant owners must simultaneously balance power and thermal demand efficiently and economically. Here's a prescription for your next plant design.

ELECTRIC POWER Conference set for record year

ELECTRIC POWER 2007, sponsored by POWER magazine, will be presented at the Donald E. Stephens Convention Center in Rosemont, Ill., May 1 through May 3, 2007. A full agenda of preconference workshops and tutorials is scheduled for Monday, April 30.

Fish and cooling water intakes: Debunking the myths

Thermal power plants are required to use fish protection technologies or make changes in plant operation to protect aquatic organisms. We intuitively understand that some organisms in the water drawn in to cool a power plant can be injured or killed when they hit a screen or enter the circulating water system. You have options for compliance with EPA rules; some are extremely expensive and burdensome, whereas others are brilliant in their simplicity. This article debunks several fish impingement myths and gives practical advice for successful compliance.

Mapping technology chaos

Power engineers are in a predicament: Technology is advancing at a dizzying pace, but we are unsure how to mine information from disparate sources or predict the next big thing. Becoming expert at finding technology hones your competitive edge in both the workplace and the marketplace. Bring your pick and shovel, and we'll show you where to start digging.

Practical guidelines for determining electrical area classification

A century ago, boiler explosions were an all-too-familiar event. But with the universal adoption of the ASME Boiler and Pressure Vessel Codes in 1914, explosions caused by poor design or manufacturing became relics of history. Electrical classification codes had the same effect on safety. This article explains how designers and operators practically apply those standards. Code details and samples of area classification drawings for a gas turbine plant are included in an online supplement (see end of story).

This month in POWER ...

March 1886 POWER reported on the latest development of a new and improved engine: "The chief feature of the Corliss engine [from Kendall & Roberts, Cambridgeport, Mass.] is the valve…

U.S. Commercial Service helps suppliers go global

Successful exporting of goods and services is essential for U.S. companies seeking to exploit the increasingly open world economy. In the export business, the challenge is learning the ropes without getting hung out to dry when entering a potentially lucrative but unfamiliar market. Take advantage of the significant experience of the U.S. Commercial Service—its people really are here to help.

Water hammer and other hydraulic phenomena

The term "water hammer" encompasses a handful of hydraulic and thermohydraulic mechanisms. They include water hammer in steam and water piping, water piston, water induction, flash condensation and evaporation, and shock waves generated by transonic flow. All can lead to failures of steam and water cycle components and put plant operators and workers at risk. Proper design and O&M practices can keep water hammer and similar phenomena under control.

Will turbines require expensive retrofits to handle imported LNG?

With domestic reserves of natural gas declining and demand for gas rising, imported liquefied natural gas will increasingly fill the shortfall in U.S. pipeline supply. More than 40 LNG receiving/regasification terminals on three coasts are in various stages of development. Yet many questions about the operational and emissions impacts of the "hotter" LNG imports on today's cleaner-burning gas turbines remain unanswered.

Departments

Commentary

A vision for speeding up science and technology developments

As David Wojick explains in his article, "Mapping technology chaos," on page 36, power engineers are under the gun to innovate. The president and Congress are calling for dramatic new…

New Products

Legal & Regulatory

Why raising renewable portfolio standards won't work

Almost half of U.S. states now insist that their investor-owned electric utilities serve a specified percentage of their load with electricity from renewable resources by a date certain. Utilities struggling…

Focus on O&M

Focus on O&M (March 2007)

The critical subset / Aging workforce challenges / Tighter tolerances in retrofits / Writing sensible start-up and shutdown procedures

Global Monitor

Global Monitor (March 2007)

Winter storms ravage Nebraska grid / Waste-fired plant coming to Arizona / Wartsila lands jobs in Azerbaijan, Sweden / Yet another controversial LNG project / Siemens lands two-gasifier order in China / IndyCars drink nothing but ethanol / New Otto/diesel engine to debut in Russia / POWER digest / Readers talk back

Speaking of Power

This month in POWER ...

March 1886 POWER reported on the latest development of a new and improved engine: "The chief feature of the Corliss engine [from Kendall & Roberts, Cambridgeport, Mass.] is the valve…

Unequivocal bragging rights

The new congressional leadership has promised a "new" agenda for fighting climate change based on reducing the quantities and rate of growth of greenhouse gases (GHG) discharged to the atmosphere.…

GBR Reports