Internal Data Search by Text Descriptor
Electric Fuel Control Valve Streamlines Plant Operations
A Frame 6B-powered cogen plant in California was plagued with fuel-gas valve problems, usually requiring at least a man-shift’s worth of work each outage to disassemble, clean seats/plugs, and reassemble. One solution is to reheat the fuel gas to above the dew point (120-130F) in between the valves, but this is considered far from ideal. The better solution proved to be replacing the original valve with a “smart” electric control valve in the same location as the original and a separate solenoid-operated stop/isolation valve about 6 ft upstream—just outside and below the turbine enclosure.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Fuel System, Valve, Maintenance, Combined Cycle Journal, USA
Continuous-Blowdown Block Valve Reduces Startup Time
At Essential Power LLC’s Newington Energy Facility, the high-pressure (HP) steam-drum continuous blowdown system was designed to cascade flow to the intermediate-pressure (IP) steam drum. While the valve worked well for controlling flow, it did not have the degree of leak-tightness required for stopping flow from the drum during typical overnight shutdowns. An automatic full-port ball valve was installed upstream from the existing automatic control valve to eliminate the risk of flashing.
Revision Date: 5/28/2015
Tags: 221112 - Fossil Fuel 化石燃料, Valve, Leakage, Combined Cycle Journal, USA
Are Flexible Generation Plants Performing as Expected?
This article reviews the performance of the Siemens Flex-Plant installed at the Lodi Energy Center in Lodi, California. Designed to be highly flexible, fast-ramping and fast-cycling to complement renewable power generation, the facility experienced 380 starts over the two-plus year period from November 2012 to January 2015. The consensus is that the facility has lived up to expectations, although operational and maintenance costs are higher than for a typical combined cycle plant.
Revision Date: 4/2/2015
Tags: 221112 - Fossil Fuel 化石燃料, Siemens, Gas Turbine, FlexPlant, Performance, Power Magazine, USA
Monitoring Iron transport in power generataion - Hach Application Note
Nephelometer has advantages over the particle counter. It is easily calibrated and can determine absolute iron oxide concentrations.
Revision Date: 9/17/2014
Tags: 221112 - Fossil Fuel 化石燃料, Hach, Monitoring Equipment, Particle Detection, Monitoring, Water Treatment
ACS 1000 variable speed drives improve efficiency of CHP power plant
The boiler feed-water pumps at Helsinki Energy‘s CHP plant were controlled by wound-rotor motors with slip recovery control system. In order to reduce maintenance costs and further improve the plant‘s efficiency, the pump drive systems were upgraded with four ACS 1000 variable speed drive systems from ABB (each rated at 4500 kW).
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, ABB, Variable Frequency Drive, Boiler Feedwater Pump, Efficiency, Boiler Feedwater Treatment, Finland
Ion Exchange and Reverse Osmosis
The water treatment plant at a coal and biomass-fired power plant in the Netherlands was 35 years old and needed to be replaced. Ovivo provided an ion exchange and reverse osmosis system which upgraded the boiler feedwater quality to the new standards without replacing the condensate polishing plant.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Ovivo Water, Reverse Osmosis, Ion Exchange, Ultrapure Water, Water Treatment, Netherlands
Make-Up Water Treatment by Service Contract
The basis for this brochure is an article written in 1997 describing the development of mobile water treatment units beginning in the 1960s. The brochure includes a number of emergency and longer term applications for mobile treatment units for boiler feedwater make-up and process steam make-up.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, GE, Mobile Equipment, Ultrapure Water, Boiler Feedwater Treatment
This case study describes a sky vent solution for a heat recovery steam generator (HRSG) which addresses noise and vibration concerns at a combined cycle power plant in Texas. The solution incorporated a whisper Trim III noise attenuating flow cage along with a downstream diffuser.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Emerson Process Management, Sargent & Lundy, Heat Recovery Steam Generator, Control Valve, Valve, Noise, Vibration, USA
Arvah B Hopkins: Combined-cycle repowering reduces fuel cost, decreases emissions
The City of Tallahassee plans to repower a 230MW oil-fired steam generator to combined cycle by adding two F-class gas turbines and heat recovery steam generators (HRSGs) in a 2+2+1 configuration. Phase 1 was completed in 2008 and involved the first of the gas turbines. This article discusses the equipment and controls used for the project.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Sargent & Lundy, Heat Recovery Steam Generator, Repower, Combined Cycle Journal, USA
VFD at the Hainan Yangpu 220 MW GTCC
This paper discusses the application of variable frequency drives (VFD) in the high-pressure water feeding system of boilers serving Units 11 through 13 of a combined cycle section of the Hainan Yangpu Thermal Power Plant. The article is written by the plant engineer responsible for the operation and maintenance of the system. In the first year of operation there were severe problems with the valve caused in part by inability to measure the outlet pressure of the BFP system and it was determined that a solution lay with replacing the hydraulic coupling with VFD.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Siemens, KSB, Boiler Feedwater Pump, Variable Frequency Drive, Boiler Feedwater Treatment, Flow Control, China
A systematic study of the influence of system design, station operations and cycle chemistry on corrosion product generation and flow-accelerated corrosion (FAC) was carried out at Intergen’s Coryton CCGT in Essex, UK. Coryton is a 779 MW two-by-one combined-cycle natural gas plant equipped with an air-cooled condenser (ACC). The station wanted to invest in advanced monitoring techniques with the objective of reducing corrosion in the air-cooled condenser and the potential for FAC in the heat recovery steam generator (HRSG) during normal and cycling operations, and to determine the impact of cycling operation on unit life expectancy and reliability.
Revision Date: 8/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, Nalco, Heat Recovery Steam Generator, Air Cooled Condenser, Cooling System, Corrosion, Degasification, Demineralization, UK
Providing Israeli Utility With Demineralized Water
The Israel Electric Company, which chose to convert some of its inland power generation stations to use natural gas, needed a high-quality source of demineralized water to generate steam for the high-pressure boilers and inject UPW in their gas turbines for NOx reduction in its combined-cycle power stations.
Revision Date: 8/20/2014
Tags: 221112 - Fossil Fuel 化石燃料, RWL Water, Ion Exchange, Demineralizer, Activated Carbon, Electrodialysis, Electrodeionization, Reverse Osmosis, Ultrapure Water, Nox Control, Boiler Feedwater Treatment, Demineralization, Israel
KOMIPO Relocates an Entire Combined Cycle Power Plant
South Korea has experienced years of booming electricity demand that has run ahead of its ability to maintain safe reserve margins. Korea Midland Power (KOMIPO) had an underutilized combined cycle plant in Boryeong that it decided to dismantle and move 100 miles away to Incheon to meet demand, rather than building an entirely new plant.
Revision Date: 8/20/2014
Tags: 221112 - Fossil Fuel 化石燃料, Korea Midland Power, Gas Turbine, Cost, Plant Relocation, Power Magazine, South Korea
Case History of a Water Treatment System for Cogen Plant in Puerto Rico
The traditional approach to producing high quality water for cogeneration plants is to use ion exchangers followed by a polishing process. This case study reviews the advancements that have been made in membrane technologies and discusses the lessons learned from using reverse osmosis and electrodionization systems at a 300MW combined cycle cogeneration plant in Puerto Rico.
Revision Date: 4/11/2014
Tags: 221112 - Fossil Fuel 化石燃料, AVANTech, Membrane Filter, Electrodeionization, Reverse Osmosis, Ion Exchange, Liquid Filtration, Water Treatment, Puerto Rico
MPR Repowers NRG Long Beach Generation Facility
In December 2006, NRG initiated an emergency re-powering project to restore four of seven idle combustion turbines by the summer peak generation period. MPR, as Project Engineer, completed the project in 3.5 months.
Revision Date: 4/7/2014
Tags: 221112 - Fossil Fuel 化石燃料, MPR, Gas Turbine, Repower, USA
Viledon Filters Operating in a Large Coastal Power Station
Several key environmental aspects had to be considered in selecting viledon air filters for a 400 MW combined-cycle power station located at a harbor on the south coast of England: the seawater effect, airborne emmissions, visual impact and noise.
Revision Date: 3/31/2014
Tags: 221112 - Fossil Fuel 化石燃料, Freudenberg Filtration Technologies, Air Filter, Air Intake, Air Filtration, UK
Yokogawa Supplies DCS Information Management System for Burcresti Vest Combined Cycle Plant
The Bucuresti Vest Combined Cycle Heat and Power Plant (CCHP) is located in the Romanian capital of Bucharest and supplies both electricity and heat to this city. Yokogama supplied its CENTUM CS 3000/UOI (Unified Operator Interface) control system which allows a single operator to interface with the plant's turbines, HRSG, balance of plant (BOP) facilities, and electrical systems.
Revision Date: 1/13/2014
Tags: 221112 - Fossil Fuel 化石燃料, Siemens, GE, Yokogawa Electric, Distributed Control System, Control System, Romania
Case study of a GE sodium hypochorite system water treatment installed at Entegra's Union Power Stateion. After the system was installed, the plant steadily reduced chlorine addition to the point it was finally stopped. A follow-up project was done to install a permanent hypochlorite injection system on it as well. Overall chemical cost has decreased by over 10%, a significant dollar amount for a facility of this size.
Revision Date: 12/31/2013
Tags: 221112 - Fossil Fuel 化石燃料, GE, Entrega, Treatment Chemicals, Water Treatment, Combined Cycle Journal, USA
Improved Reliability of High-AVT (High-pH Water Treatment) Application to Combined Cycle Plants
Generally in the water treatment of combined cycle plants, ammonia and hydrazine are used in the feedwater system and phosphates are used in the boiler system. However, in Mexico, the Tuxpan No. 2 and No. 5 power plants have adopted “High-AVT (high-pH water treatment),” in which ammonia is used to set the pH of feedwater higher than the conventional level, requiring no phosphates in the boiler system. In response to such good operational results, MhI introduced high-AVT as an option for the water treatment of combined cycle plants.
Revision Date: 12/31/2013
Tags: 221112 - Fossil Fuel 化石燃料, Mitsubishi Heavy Industries, Ammonia, Treatment Chemicals, Phosphate, Boiler Feedwater Treatment, Water Treatment, Mexico
10 Mwe Renewable Energy Solution: Landfill Gas to Energy Project
Solar Turbine, a Caterpillar company, has recently modified their Mercury series of gas turbines to burn landfill gas. PEI Power purchased two of the turbines for the Archbald Cogeneration Plant.
Revision Date: 12/23/2013
Tags: 221112 - Fossil Fuel 化石燃料, Solar Turbines, PEI, Gas Turbine, USA
Zepco Expansion Joint Retrofit at Florida Power Plant
Case study of a gas turbine power plant expansion joint retrofit by Zepco.
Revision Date: 11/22/2010
Tags: 221112 - Fossil Fuel 化石燃料, Zepco, Exhaust Ductwork, Expansion Joint, Exhaust Handling, USA
DEKOMTE Fabric Expansion Joint on Siemens Gas Turbine Outlet
A detailed case study analysis of a DEKOMTE fabric expansion joint design and installation on a Siemens gas turbine outlet.
Revision Date: 11/22/2010
Tags: 221112 - Fossil Fuel 化石燃料, DEKOMTE, Expansion Joint, Exhaust Handling