O&M

In recent years several EPRI projects have explored different aspects of heat rate improvements. This article, following Part 1 in the November 2014 issue of POWER , reviews results of implementing heat rate

Material-handling systems at coal-fired power plants operate nearly continuously in harsh conditions for decades. Temperatures, moisture, overload conditions, and collisions from equipment can take a toll on

Many utilities around the world have been discovering abnormal or aberrant P91 base and weld metal microstructures in their plants, leading to, or with a potential to lead to, early cracking and failure in

If you’re the person tasked with controlling the level of fly ash in collection hoppers, you know how difficult the application can be. What at first looks like a simple measurement quickly proves to be much more demanding in actual execution. The first problem is the environment inside the collection hoppers, which is extremely challenging […]

Too-frequent sootblowing can damage boiler components and place a big load on plant efficiency, but not enough of it can be just as big a problem. A sootblowing optimization system can help you find the “sweet spot.” With the increasing demands placed on today’s coal-fired power plants worldwide, operators are continuously looking for the best […]

Even without regulatory considerations, there are good reasons for virtually every coal-fired power plant to improve its heat rate. The Electric Power Research Institute (EPRI) has looked at dozens of methods for improving heat rates and evaluated their applicability and costs. Part 1 of this two-part series explains the basics of heat rate improvements and […]

What do a power plant, a hospital, a police station, and a remote mine have in common? They all have essential assets requiring uninterruptible power, commonly powered by an engine generator as primary or backup power. Engine generators, often termed “gensets,” combine an electrical generator and an engine. They supply electrical power where normal utility […]

Plant engineers at Eskom’s Majuba Power Station in South Africa have been continuously looking for ways to improve efficiency and reliability. The six-unit, 4,000-MW, supercritical coal-fired plant was experiencing an efficiency decrease of 5% to 7%, which plant engineers determined was caused by poor performance of the actuators on their condensate level control valves (CLCVs). […]

Cold temperatures are nothing new, but extreme winter weather has been in the headlines more and more in recent years. Many of us had never heard the term “polar vortex” before last winter, but earlier

A sustained Arctic blast composed of freezing rain, record snowfalls, and high winds hit 22 states, from Mexico to New England in early February 2011. The extreme weather severely affected the power generation

During the Jan. 3–12, 2014, polar vortex that brought record-setting cold temperatures and severe winter weather to much of the U.S., nuclear plants not only survived, but thrived. According to the Nuclear

Twice this year, PJM flirted with blackouts when brutal winter storms (dubbed a polar vortex) struck the Eastern U.S. in January. The cold weather set a new winter peak demand record of 141,500 MW on Jan. 7

The upcoming implementation of the Environmental Protection Agency’s (EPA’s) Mercury and Air Toxics Standards (MATS) is putting pressure on coal-fired power plants to develop and implement compliance

Although industrial lubricants typically account for only 1% of plant operational costs (Figure 1), the lack of proper lubrication products, techniques, or applications can have a much more severe effect on

With Units 6 and 7 back in operation, Colorado Springs Utilities (CSU) has restored 80% of the generation capacity at its Martin Drake Power Plant located in downtown Colorado Springs. The plant was taken offline after sustaining significant damage during a May 5 fire. Most of the damage occurred in the area surrounding Unit 5, […]

Like some of those tests your doctor is always after you to get, boiler chemical cleaning is something that most of us would rather not think about but that we all agree is necessary. Adding to our general discomfort with the process are new Environmental Protection Agency regulations, which make the disposal of chemical cleaning […]

To ensure that its nuclear plants do not meet the same fate as those damaged and destroyed by the March 2011 events at the Fukushima Daiichi plant—should they be hit by similarly severe natural disasters—Tennessee Valley Authority (TVA) is using multiple new approaches to enhance safety. First Installation of New Spent Fuel Pool Instrumentation Spent […]

Skilled maintenance and service teams inspect critical infrastructure, perform preventive maintenance, and quickly respond to issues to keep service levels high. It is critical that such teams work with as-built drawings that reflect original plans along with the cumulative changes. Armed with the current drawings, service teams can avoid surprises. The challenge is that drawings […]

This supplement to “Strategies for Inspecting HRSGs in Two-Shift and Low- Load Service” in the August issue includes additional discussion of the heat recovery steam generator (HRSG) Inspectors Toolkit and HRSG Inspection Guide sections of the main article plus additional photos of damage caused by rapid startups and two-shifting of units over time. More Tools […]

A combination of falling natural gas prices, greater integration of renewable generation, and advancing technology has meant changing roles for many plants, particularly gas turbine combined cycle plants. (See “Managing the Changing Profile of a Combined Cycle Plant” in the June 2014 issue.) The added wear and tear on plant equipment, and the changing maintenance […]

Aheat-recovery steam generator (HRSG) is much like other power generation equipment—run it at design conditions and chances are it will run with high availability and require only routine maintenance for

The utility-scale solar market is rapidly growing in North America, representing a large area of opportunity for project and product developers alike. The market more than doubled in size between 2012 and 2013

Problematic power plant systems diminish availability and directly affect plant productivity and efficiency. In order to maintain availability, electrical testing and maintenance services are imperative. Two

Eddy currents are electrical currents induced within conductors by changing magnetic fields. They are commonly used in nondestructive evaluation (NDE) and corrosion monitoring of structures with painted surfaces. The work of eddy current technicians, who specialize in the electromagnetic modality, requires a high degree of accuracy even when working under challenging testing conditions. Traditionally, technicians relied on […]

Conducting conveyor inspections and maintenance can pose significant risks to employees, as these activities bring workers into close proximity with the conveyor system under potentially dangerous conditions. Staff members are exposed to moving belts, rolling components, and pinch points, all in an environment that is commonly dirty, distracting, and sometimes noisy. As plants struggle with […]

With 4.4 million customers and nearly 46 GW of generating capacity, Atlanta-based Southern Co. has doubled the size of its supervisory control and data acquisition (SCADA) system in the past three years and

Brazil’s Belo Monte hydropower project includes a complex of dams, numerous dikes, and a series of canals supplying two different power stations with water. With a rated capacity of 11,233 MW, it will be the

On May 16, 2014, the Environmental Protection Agency (EPA) is scheduled to release its long-delayed final 316(b) rule for existing facilities. The rule—which was supposed to have been issued Apr. 17 after

With the growing need for operational flexibility across the power industry, the combined-cycle gas turbine (CCGT) fleet is increasingly being subjected to load-following and cyclic operation. This change in

All power plants must continually strive to control operating expenses, but it is particularly important for coal-fired facilities to cut costs these days to stay competitive while meeting ever-more-stringent