Internal Data Search by Product
Smart Starts Mitigate HRSG Damage, Preserve Reliability
A smart start is one that is able to fulfill these three goals: 1) Avoid damage and preserve reliability (more specifically, minimize damage from thermal stress and overheating); 2) Permit rapid loading of the gas turbine; and 3) Provide steam at the proper flow rate and temperature to the steam turbine.
Revision Date: 7/20/2015
Tags: 221112 - Fossil Fuel 化石燃料, HRST, Heat Recovery Steam Generator, Attemperator, Economizer, Thermal Shock, Startup, Maintenance, Combined Cycle Journal
How to Reduce the Startup Time of a Legacy Combined Cycle
Legacy HRSGs in service may restrict or limit the plant startup rate, but some possible upgrades can reduce the amount of time it takes to bring a combined cycle online. This article discusses three options: steam sparging, controlling the HP-drum termperate ramp rate independently of the gas turbine startup rate be venting steam, and lay-up practices.
Revision Date: 7/20/2015
Tags: 221112 - Fossil Fuel 化石燃料, HRST, Heat Recovery Steam Generator, Startup, 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
HRSG Coverage Increases at WTUI as LM Cogen, Combined-Cycle Facilities Multiply
Thermal shock can occur in panel type economizers and HRST Inc’s ShockMaster economizer is designed to resist tube cracking and other issued caused by thermal gradients. Buoyancy instability is also a cycling issue that causes flow stagnation in panel type economizers.
Revision Date: 7/20/2015
Tags: 221112 - Fossil Fuel 化石燃料, HRST, Heat Recovery Steam Generator, Economizer, Thermal Shock, Combined Cycle Journal
Gas Turbines: Design and Operating Considerations
This article provides a number of engineering recommendations to improve gas turbine operation and performance while reducing operating costs, particularly for the chemical processing industry. Topics include aeroderivative gas turbine.
Revision Date: 7/20/2015
Tags: 221112 - Fossil Fuel 化石燃料, 325000 - Chemical Manufacturing , Gas Turbine, Aeroderivative Gas Turbine, Heat Recovery Steam Generator, Chemical Engineering World
How to Design, Retrofit Drum-type HRSGs to Cycle, Start Faster
Fast start and fast ramp of HRSGs in necessary in order to back up renewables when the wind stops or clouds appear. Fast starts/fast ramps also reduce the total emissions during a start, cut startup costs, and enable the plant to achieve full-load revenues faster. This article summarizes a presentation regarding the design and retrofit of HRSGs in order to optimize fast starts and fast ramps.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, Vogt Power International, Heat Recovery Steam Generator, Optimization, Heat Recovery, Fast Start, Combined Cycle Journal
Fast-Start HRSG Life-Cycle Optimization
Modern heat recovery steam generator (HRSG) design must balance operating response with the reduction in life of components caused by daily cycling and fast starts. Advanced modeling techniques demonstrate HRSG startup ramp rates can be accelerated without compromising equipment life.
Revision Date: 6/3/2015
Tags: 221112 - Fossil Fuel 化石燃料, Foster Wheeler, Heat Recovery Steam Generator, Life Cycle Cost, Optimization, Heat Recovery, Fast Start, Power Magazine
High-Pressure Valves: Why you should buy only premium valves
This case study reviews the process of replacing a main steam valve for an F-class heat recovery steam generator (HRSG), including step-by-step photos. Given the extensive and expensive effort involved, the author suggests that HRSG valve selections consider quality and not just cost.
Revision Date: 4/22/2015
Tags: 221112 - Fossil Fuel 化石燃料, Bremco, Control Valve, Heat Recovery Steam Generator, Valve, Maintenance, Flow Control, Combined Cycle Journal
Protecting Steam Cycle Components During Low-Load Operation of Combined Cycle Gas Turbine Plants
The cyclic operation of peaking plants introduces challenges that can result in damage to steam cycle components. This article provides an overview of the components that may be affected by low-load operation and highlights some potential solutions and the trade-offs involved. For example, at low-load conditions it is often difficult to keep heat exchange surfaces below design temperatures or operationally limited temperature. Low-load operation also introduces enhanced risk of fatigue damage and accelerated life consumption for Grade 91 piping materials.
Revision Date: 4/2/2015
Tags: 221112 - Fossil Fuel 化石燃料, Heat Recovery Steam Generator, Condenser, Steam Turbine, Cycle Chemistry, Power Magazine
Colleen Layman advised that chemistry limits developed for traditional industrial watertube boilers are not generally applicable to HRSGs. Chemistry is unique.
Revision Date: 9/25/2014
Tags: 221112 - Fossil Fuel 化石燃料, 221112 - Fossil Fuel 化石燃料, HDR Engineering, Heat Recovery Steam Generator, Treatment Chemicals, Cycle Chemistry, Water Treatment
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
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
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
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
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
This presentation provides a ten year history of flow accellerated corrosion issues.
Revision Date: 6/11/2014
Tags: Tetra Engineering, Heat Recovery Steam Generator
HRSGs in cycling service are exposed to a variety of damage mechanisms that can cause premature pressure-part failures if not eliminated in the design phase of new units, or identified and mitigated early in the life of existing units.
Revision Date: 6/11/2014
Tags: Competitive Power Resources, Heat Recovery Steam Generator, Maintenance, Service & Repair
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
Layup Strategies for Maintenance Outages and when not Dispatched
Today’s challenging business environment, coupled with the volatility in natural-gas prices, has many merchant-plant owner/operators wondering when they will be dispatched next. Such uncertainty increases the complexity of decision-making regarding wet versus dry layup.
Revision Date: 6/11/2014
Tags: 221112 - Fossil Fuel 化石燃料, ALS Consulting, Heat Recovery Steam Generator, Maintenance, Heat Recovery, Combined Cycle Journal
ALS for CCUG HRSG Strategic and Financial Planning of HRSG Maintenance
Need a maintenance program which starts with an assessment of needs and identifies the magnitude of the potential problems, the frequency for review and a designated individual responsible for each.
Revision Date: 6/11/2014
Tags: 221112 - Fossil Fuel 化石燃料, ALS Consulting, Heat Recovery Steam Generator, Maintenance, Service & Repair, Heat Recovery
Sky-vent system from Emerson insures temperature control of turbine during startup
Valves within the sky vent system of a combined cycle plant serve one of the more important control functions. During initial operation of the HRSG, these valves bypass steam (HP/HRH/LP) around the steam turbine to ensure that the unit doesn't come up to temperature too quickly. This is done as the process lines are warmed prior to admitting steam through the turbine bypass valves that dump to the condenser.
Revision Date: 6/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, Emerson Process Management, Control Valve, Heat Recovery Steam Generator, Valve
Foster Wheeler has been installing HRSGs since 1958 and has over 350 installations. They cite design differences which make their products unique.
Revision Date: 6/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, Foster Wheeler, Heat Recovery Steam Generator, Heat Recovery
Mogas HRSG valves depicted in schematic
Mogas has identified the key locations where their valves are used in HRSG systems.
Revision Date: 6/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, Mogas Industries, Heat Recovery Steam Generator, Valve, Schematic
According to this product brochure, Alstom's unique Optimised for Cycling and Constructability (OCC™) design provides the unparalleled flexibility needed for reliable high-cycling duty which is capable of fast starts, high ramp rates and high turndown, resulting in enhanced flexibility under a wide range of operational scenarios.
Revision Date: 6/10/2014
Tags: 221112 - Fossil Fuel 化石燃料, Alstom, Heat Recovery Steam Generator, Heat Recovery
Rapid Startup Analysis of a Natural Circulation HRSG Boiler with a Vertical Steam Separator Design
B&W PGG has introduced a new concept for a rapid start HRSG by, among other things, incorporating the use of one or more vertical steam separators instead of an HP steam drum.
Revision Date: 2/3/2014
Tags: 221112 - Fossil Fuel 化石燃料, Babcock & Wilcox, Heat Recovery Steam Generator, Vertical Separator, Heat Recovery
Environmental Alternatives Company Profile in the Combined Cycle Journal, October 1, 2013
EAI was the first company to utilize CO2 for cleaning HRSGs and introduced this technology to the combined cycle power market back in the early 1990’s. EAI cleans dozens of HRSGs every year for customers all over the country and have even provided HRSG cleaning for many foreign clients in over 10 countries around the globe.
Revision Date: 10/23/2013
Tags: 221112 - Fossil Fuel 化石燃料, Environmental Alternatives, Heat Recovery Steam Generator, Service & Repair, Combined Cycle Journal
Precision Iceblast - Air-Inlet House Listing in Combined Cycle Journal, October 1, 2013
Precision Iceblast Corporation is a world leader in HRSG tube cleaning. We clean more HRSG’s than any other ice blasting company in the world. We provide an invaluable service to our customers and insure that their HRSG’s are running highly efficient by providing the cleanest boiler tubes possible. Our cleaning results always provide decreased back pressure and increased output.
Revision Date: 10/22/2013
Tags: 221112 - Fossil Fuel 化石燃料, Precision Iceblast, Heat Recovery Steam Generator, Service & Repair, Heat Recovery, Combined Cycle Journal
Mitsubishi Power Systems Americas, Inc. at Electric Power 2013
Information regarding booth at Electric Power 2013.
Revision Date: 5/24/2013
Tags: 221112 - Fossil Fuel 化石燃料, Mitsubishi Power Systems, SCR, Heat Recovery Steam Generator, Nox Control, USA
Discussion of advantages of vertical separators.
Revision Date: 3/7/2013
Tags: 221112 - Fossil Fuel 化石燃料, Babcock & Wilcox, Vertical Separator, Heat Recovery Steam Generator, Heat Recovery
Deron reviewed design considerations for drum type HRSGs.
Revision Date: 3/7/2013
Tags: 221112 - Fossil Fuel 化石燃料, Babcock Power, Heat Recovery Steam Generator, Heat Recovery
Landon explained that the Once-Through Steam Generator is a drumless HRSG that is smaller, more flexible, and simpler than a traditional, HRSG.
Revision Date: 3/7/2013
Tags: 221112 - Fossil Fuel 化石燃料, Innovative Steam Technologies, Heat Recovery Steam Generator, Heat Recovery, Once Through Cooling
HRSG Design, Operation and Maintenance Considerations Webinar - Hot Topic Hour March 7, 2013
Design, installation, operation and maintenance of HRSGs for various applications.
Revision Date: 3/7/2013
Tags: 221112 - Fossil Fuel 化石燃料, Babcock Power, Clyde Bergemann, Babcock & Wilcox, Innovative Steam Technologies, Vertical Separator, Heat Recovery Steam Generator, Heat Recovery