HRSG

Cycle-chemistry guidelines for combined cycle power plants have changed over the years, with pH frequently maintained between 9.6 and 10.0 today. That can cause problems with condensate polisher operation

Today’s heat recovery steam generators (HRSGs) are suffering reliability problems, mainly because they’re being operated in the cycling mode instead of the baseload mode for which they were designed. The good news is HRSG suppliers are adapting to the market demands and are designing the next generation of HRSGs to have cycling-friendly—also called fast-start—features. One […]

Ever since deregulation came to the power industry, combined cycle plant managers have been trying to benchmark their production metrics and cycling costs against those of their competitors. There has always

Attemperation equipment is necessary to control steam temperatures at many power plants. However, when the equipment functions improperly or the design is flawed, thermal quenching/shock can damage piping

When U.S. President Jimmy Carter signed into law the Public Utility Regulatory Policies Act of 1978 (PURPA), he unintentionally ignited the worldwide deregulation of electricity markets, which in turn began a worldwide technology race between two distinct types of power plants: the newly created, industrial-scale plant that PURPA dubbed “cogeneration” and the traditional, utility-scale power […]

It is fairly common for power plant engineers and maintenance managers to focus on fireside issues rather than waterside issues during routine maintenance outages. However, that could be a mistake. Waterside

Thermohydraulic simulations can provide detailed heat recovery steam generator (HRSG) data to help determine the root cause of failures, predict the degree of wear from various mechanisms, and assess the

Many combined cycle power plants have established a pH guideline between 9.6 and 10.0 to minimize corrosion in heat recovery steam generators and condensers. Neutralizing amines are used to achieve these pH

On many combined cycle projects, the major decisions about boiler chemistry are left until after the plant has been designed, equipment is procured, and construction is well underway. However, the best time to make these chemistry decisions is in the design phase of the project. That enables the engineering, procurement, and construction (EPC) contractor to […]

For a decade or more, heat recovery steam generator (HRSG) users have heard that Grade-91 tubing (T-91) is susceptible to microstructure damage from improper heat treatment. Now, a new damage mechanism in T-91 tubing has been identified, which HRSG users heard about at the February 2018 HRSG User’s Group Conference. During the discussion on heat […]