Introduction to the complementary fired combined

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Introduction to the complementary fired combined

Sullivan Siemens Power Generation ABSTRACT This paper challenges the conventional method of fuel-based bottoming cycle power augmentation in a combined cycle plant, in which a fuel source is combusted in the hot flue gas stream internal to a combined cycle HRSG — also known as supplementary firing or duct firing.

Although duct firing is an effective means of increasing plant capacity, it significantly reduces the plant efficiency.

Additionally, as the world fuel markets continue to incur a substantial increase in demand, power plant owners and operators are more actively seeking plant solutions that provide better performance flexibility.

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To provide a solution that would allow plant owners better dispatch options, a system was developed that provides base load outputs with maximum efficiencies as well as incrementally selectable peaking outputs with high plant efficiencies.

This configuration offers very high peak loading efficiency as well as the possibility to increase the level of power augmentation due to its unique impact on the HRSG.

This system can be applied to new unit construction, and also has the potential to be retrofitted into plants with and without existing duct firing systems.

This paper explains the Complementary Fired Combined Cycle plant design concept and compares its plant performance characteristics with conventional duct fired plants. Retrofitting applications are also explored. INTRODUCTION Traditional methods for combined cycle peak loading, although effective for providing power, are not well suited to the current global energy and economic models in which higher peak plant efficiency is steadily becoming a critical design criteria.

For this reason, a novel concept for providing enhanced combined cycle performance, both on a power and on a heat rate basis, was developed.

Introduction to the Complementary Fired Combined Cycle Power Plant - New York Essays

This document describes this system and provides specific performance calculations for the application of currently available equipment. This system can be applied to new unit construction or as a retrofit to already existing power plants as a power peaking application or a heat rate reduction option.

This art departs from the traditional concept of combusting a supplemental fuel directly in the path of the flue gas in the HRSG sas detailed in U.

This concept fits particularly well when considered and used for high ambient temperature peaking applications since the typical HRSG design basis is a cold day application when the largest flue gas mass flows are achieved.

As ambient temperatures increase, the base GT exhaust mass flow s decrease, thereby allowing ample flue gas mass flow augmentation capacity.

In this system, referred to as Complementary Firing, additional fuel to augment the bottoming cycle output is first combusted in the complementary industrial sized gas turbine. This differs from the conventional peak loading scheme, in which fuel is combusted directly in the HRSG.

Configuration The conceptual design basis for the Complementary Firing system Figure 1 entails a power plant consisting of: At least one base gas turbine topping or Brayton cycle with at least one HRSG and at least one steam turbine, bottoming or Rankine cycle.

At least one industrial or complementary gas turbine and generator set, also called the complementary topping cycle or complementary Brayton cycle. The multiple Interface Points shown in the above Figure represent the possible tie-in points that merited evaluation.

Interface Points In order to optimize the plant performance in complementary fired mode, several possible HRSG interface points where the complementary topping cycle exhaust gas mixed with the base exhaust gas were studied. As can be seen in Figure 1, three possible insertion points were considered….Aug 29,  · Introduction to the Complementary Fired Combined Cycle Power Plant Essay Termed as Complementary Fired Combined Cycle (CFCC), this system is predicated on the use of fractionally sized gas turbines, with their exhaust ducted into the HRSG(s) associated with their base GT(s).

Power plant models integrated with capture and compression process models of Sequential Supplementary Firing Combined Cycle (SSFCC) gas-fired units show that the efficiency penalty is % points LHV compared to a conventional natural gas combined cycle power plant with the same capture technology.

Introduction to the concept. Non. Co-firing (also referred to as complementary firing or co-combustion) is the combustion of two different fuels in the same combustion system.

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Introduction to the complementary fired combined

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