Data Search by General Subjects
IAPWS Gives Guidance for Monitoring Steam Purity
Problems caused by mechanical and vaporous carryover of contaminants in the water to the steam cycle begin with deposition and corrosion of HRSG tubes and steam-turbine surfaces and can ultimately lead to material deterioration, performance deterioration, extensive downtime for removing deposits, and catastrophic failures. This article gives guidance for monitoring steam purity to avoid these issues.
Revision Date: 8/11/2015
Tags: 221112 - Fossil Fuel 化石燃料, Corrosion, Cycle Chemistry, Sampling, Combined Cycle Journal
How to Boost HRSG Performance and Increase Your Plant’s Bottom Line
The performance thieves lurking in many heat-recovery steam generators sometimes can be eliminated with relatively little effort and at low cost. This article discusses four primary performance thieves: Gas baffling, Gas-side fouling, LP economizer recirculation and Buoyancy instability/vapor locking.
Revision Date: 7/20/2015
Tags: 221112 - Fossil Fuel 化石燃料, HRST, Heat Recovery Steam Generator, Economizer, Performance, Thermal Shock, Corrosion, Heat Recovery, Combined Cycle Journal
Nonwovens in Gas Turbine Air Filtration
Clarcor offers a full range of air inlet filters for gas turbine applications including panel, pocket V-cell and cartridge filters. This presentation addresses ways to improve inlet filtration to avoid fouling and corrosion of turbine equipment.
Revision Date: 4/24/2015
Tags: 221112 - Fossil Fuel 化石燃料, CLARCOR Inc., Air Filter, Corrosion, Air Filtration
Power Plant Chemicals Webinar - Hot Topic Hour September 25, 2014
The level of knowledge demonstrated by the speakers relative to the challenges of preventing corrosion and malfunction of gas turbine combined cycle plants which are cycling hundreds of times per year and may be using poor quality source water makes a persuasive case for continuing expert advice.
Revision Date: 9/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, McIlvaine, Kiewit, Miox, HDR Engineering, Heat Recovery Steam Generator, Air Cooled Condenser, Fogging System, Cooling Tower, Treatment Chemicals, Ultrapure Water, Cycle Chemistry, Corrosion, Water Treatment, Zero Liquid Discharge
Questions answered regarding HRSG water/steam chemistry and prevention of corrosion and fouling in steam generators. Even seemingly minor issues have been known to cause failures that cost power producers millions of dollars and in some cases even claimed lives. This is the ultimate cost.
Revision Date: 9/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Kiewit, Air Cooled Condenser, Heat Recovery Steam Generator, Fogging System, Treatment Chemicals, Cycle Chemistry, Corrosion, Ultrapure Water, Water Treatment, Zero Liquid Discharge
Combined cycle On-Line Measurements - Mettler Toledo presentation by David Gray
Specific conductivity, cation conductivity, dissolved oxygen, redox, pH, sodium, silica and total organic carbon are all measured by MT instruments. Intelligent digital sensors have advantages. Optical DO offers faster measurement and less maintenance but polarographic offers measurement to lowest concentrations
Revision Date: 9/17/2014
Tags: 221112 - Fossil Fuel 化石燃料, Mettler Toledo, Monitoring Equipment, Sensor, Corrosion, Cycle Chemistry, Schematic, Water Treatment, Monitoring
EPRI’s Guideline on Chemistry for Fossil Units with Air-cooled Condensers (ACCs)
This paper provides the results of the first worldwide survey of a number of fossil and combined cycle/HRSG plants with air-cooled condensers (ACCs). It includes documentation of the surface condition of the duct surfaces, defining serious corrosion/flow accelerated corrosion regions and guidelines for operating plants with ACCs.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Structural Integrity Associates, Xcel Energy, EPRI, Air Cooled Condenser, Cycle Chemistry, Corrosion, Dry Cooling
New Technology for Monitoring Cycle Chemistry
This presentation discusses online analytical monitors of conductivity, pH, dissolved oxygen, sodium and silica which incorporate digital sensors to improve performance and provide predictive diagnostics. The digital conductivity sensor, for example, can provide a 33 percent improvement in system accuracy.
Revision Date: 9/8/2014
Tags: 221112 - Fossil Fuel 化石燃料, Mettler Toledo, Monitoring Equipment, Sensor, Cycle Chemistry, Corrosion, Water Treatment, Monitoring
The reducing environment produced by oxygen scavengers initiates and propagates flow-accelerated corrosion (FAC) in the feedwater system and other components of high-pressure steam generators, including heat recovery steam generators (HRSGs). Since 1986, FAC-induced attack has caused numerous failures, some with fatalities, at a number of power plants in the U.S. Yet, specifications for many new power plants both domestically and globally, and in which the condensate/feedwater system contains no copper alloys, continue to call for oxygen scavenger feed to the condensate. This document is a response to this misguided trend.
Revision Date: 8/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, Kiewit, Boiler Feedwater System, Heat Recovery Steam Generator, Ultrapure Water, Corrosion, Demineralization, Boiler Feedwater Treatment, Degasification
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
Flow Accelerated Corrosion is a Problem to be Addressed
Better water chemistry and design have reduced the FAC potential but a number of steps need to be taken to minimize the risk.
Revision Date: 6/11/2014
Tags: Tetra Engineering, Heat Recovery Steam Generator, Corrosion, Maintenance, Heat Recovery
Valves for Power Plant Steam and Water Applications Webinar - Hot Topic Hour June 2, 2011
The speakers addressed issues for the various valve applications in power plant steam and water systems. Password: hth484
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Crane Energy Flow Solutions, CCI, Weir Valves & Controls, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control
Severe Service Control Valves by Ory Selzer, CCI - Hot Topic Hour June 2, 2011
Ory Selzer, Valve Doctor - Power, Americas at CCI -Control Components, Inc, described the important requirements of severe service control valves, as they apply to steam and water.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, CCI, Ball Valve, Valve, Erosion, Cavitation, Corrosion, Noise, Vibration, Flow Control
Donald Johnson of CRANE ChemPharma Flow Solutions & CRANE Energy Flow Solutions stated that pressure locking and thermal binding solutions are important for wedge gate and parallel slide gate valves.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Crane Energy Flow Solutions, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control
Severe Service Control Valves by Ory Selzer, CCI Valve - Hot Topic Hour June 2, 2011
Ory Selzer, Valve Doctor - Power, Americas at CCI -Control Components, Inc, described the important requirements of severe service control valves as they apply to steam and water.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, CCI, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control
Donald Bowers, Vice-President, Sales & Marketing at Weir Valves & Controls, discussed the challenges of Center Cavity over Pressurization (CCOP) that can cause Pressure Locking (PL) and Thermal Binding.
Revision Date: 6/2/2011
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, Weir Valves & Controls, Valve, Corrosion, Erosion, Vibration, Noise, Cavitation, Flow Control