TECHNOLOGIES - power plant performance

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Combined Cycles

Combined Cycles

TGPS evaluates the combined cycle performance of power plants around the world. Our company has a global team of performance engineers and technicians that are ready to provide you with un-biased combined cycle efficiency analysis. Possible you are interested in your combined cycle heat rate or in the efficiency of your individual equipment. Our team is ready to support the performance needs at your plant.

Combined Cycle Performance

Our company evaluates the combined cycle efficiency of different suppliers such as GE, Siemens, Alstom, Mitsubishi, Ansaldo among others. The combined cycle heat rate and combined cycle efficiency are among the parameters of major interests. However, from a total power plant performance analysis, TGPS also analyze the individual equipment efficiency that could impact your combined cycle heat rate and power output.

The plant configuration can be 1X1, 2X1, 3X1, multi-shaft and single-shaft units.. We test 1, 2 or even 3-phase projects, when the final combined cycle plant was not installed at the same time. First the simple cycle, then the steam turbine and finally BOP and export steam elements. In these projects, it is important to define as soon as possible a testing strategy, so the right data can be collected at the right phase of the project.

We hold a large inventory of testing equipment to conduct high-precision combined cycle performance test around the world. For example, this is particularly useful when there is the need to minimize your combined cycle heat rate test uncertainty.

Combined Cycle Heat Rate

Probably the most important parameter in a combined cycle power plant is the combined cycle heat rate. This is a relationship of fuel consumption and electricity production. In general terms, the combined cycle heat rate is the inverse of the combined cycle efficiency. The most efficient gas turbines at the moment are the H-technology. In a combined cycle application,  they can reach over 60% of plant efficiency. Several factors can alter the combined cycle efficiency over time. Operational modes, equipment degradation, load cycling, etc.

TGPS helps you to identify the areas of opportunity to improve you combined cycle efficiency.

Compliance with the applicable international performance test codes such as:

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Performance Test Procedure

For a combined cycle performance test, there are certain specific items to place special attention in the combined cycle performance test procedure.

  • Combined Cycle Isolation (thermal and electrical isolation)
  • Test Boundaries Definition
  • Combined Cycle Performance Guarantees
  • Testing Instrumentation
  • Calculation of final Combined Cycle Performance

TGPS has a diverse range of experience, not only in the CC configuration, but also in complex evaluation of projects that occurs in a multi-stage testing program as defined in the ASME PTC 46.

Acceptance Test vs Diagnostic Test

Depending on the objective of testing certain parameters are more critical than others. Only an experience power plant performance engineer can guide the process through the most efficient path to achieve the specific objectives. For a contractual performance test topics such as test uncertainty, performance guarantees are more relevant. In a diagnostic test, not only these parameters are important, but also looking to historical trends, power plant upgrades, operation modes, load cycling, among others. Our team uses the latest tools to diagnostic the combined cycle performance heat rate in an accurate and practical way. Results that can impact directly the combined cycle efficiency.

Overall Plant Assessment

In a combined cycle power plant, it is critical to look to the overall plant performance and analyzing the individual equipment without leaving aside the overall picture. For example, your combined cycle heat rate could be affected by some upgrade in the gas turbine efficiency. It is recommended that before making a decision on the upgrade of any major equipment at your plant, a combined cycle efficiency is model be created in order to decide where to get the highest return on your investment.

Why is Power Plant Efficiency Important?

Power Plant Efficiency is directly correlated to the business sustainability in terms of financial performance and long-term feasibility.

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