SPPA-P3000 thermodynamics monitoring for combined cycle power plants Siemens has developed a unique online performance monitoring solution for a combined cycle power plant, which includes the boiler feed pumps, condensate pumps and circulating water system. These performance monitoring calculations, which are part of the SPPA-T3000 platform, are designed to provide unit performance information and assist in the immediate detection of the reduced efficiency of any monitored plant component or overall plant performance degradation. The performance monitoring results, as well as the relevant associated measurements, are displayed as graphs for quick and convenient at-a-glance review. The conditions of the plant (steady state of process conditions and nominal load ratio) are additionally displayed. Steady-state condition is calculated based on the generator output power. Trend monitoring displays containing the efficiency data, the essential measurements and the load conditions are provided and can be freely configured to trend any values. All logs are operator requested. Status and sequence logs can list the data in csv format for easy export to standard spreadsheets. Any measured or calculated data can be assigned to online configurable data groups, which can be used for logging. Periodic reports, such as daily balance logs, are also a standard feature.
SPPA-T3000 integrated thermodynamics monitoring
Heat rate monitoring and efficiency Heat rate and efficiencies are calculated for gas turbines, steam turbines and for unit heat rates. Corrected unit efficiency and corrected unit heat rate are also calculated for: Unit net and gross heat rate Unit gross heat rate corrected Unit gross efficiency Unit gross efficiency corrected Unit net efficiency Unit net efficiency corrected Unit generation power Unit generation power corrected Unit auxiliary power Unit fuel power Generator power factor.
SPPA-P3000 Performance Monitoring
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Gas turbine [ASME/ANSI PTC 22] and compressor monitoring [ASME PTC 10]
Thermal efficiency of HRSG steam generator (input-output method)
Gas turbine monitoring:
Sensible heat in CT (GT) exhaust gas
Gross and unit net thermal efficiency Actual heat rate
Heat credits and losses are taken into account Absorbed heat (total, LP, IP, HP)
Corrected heat rate
Effectiveness and pinch point are calculated for the HP and LP sections
Service power rate (SPR) Fuel heat input
Steam turbine monitoring [ASME PTC 6]
Generator loss characteristics. Compressor monitoring:
Deaerator performance The air removal performance of the deaerator (DEA) is monitored through the quality limit approach. The performance value is how close the oxygen content is to the maximum value and is reflected as a percentage of the maximum value. Pump efficiency [ASME PTC 8.2] Pump efficiency (thermodynamic method) Pump power
Steam turbine efficiency
Pressure ratio
Corrected HP and IP steam turbine efficiency and heat rate
Temperature ratio Polytropic exponent of compression Compressor polytropic efficiency.
Condenser monitoring [ASME PTC 12.2] Cooling water rise Terminal temperature difference Condensate subcooling Logarithmic mean temperature difference rating (LMTD ) Utilization factor Condenser load
Additional features and services Suitable for any plant and operates with all types of I&C Complete SPPA-T3000 software engineering for the performance monitoring package Functional testing and customer witness testing of the system in Alpharetta, GA Remote or on-site testing, installation and commissioning of SPPA-T3000 performance monitoring package
Cooling water flow The thermodynamic process model assists in operating the unit at maximum efficiency.
Heat recovery steam generator (HRSG) [ASME /ANSI PTC 4.4] The HP area monitored includes the feed water from the boiler feed pump exit, that is the inlet to the HP economizer, through to the HP steam supply to the steam turbine. The DA/LP drum area monitored covers the condensate make up to the DA/LP drum to the exit to the boiler feed pumps.
Published by and copyright © 2011: Siemens AG Energy Sector Freyeslebenstrasse 1 91058 Erlangen, Germany
Heat transfer coefficient Cleanliness factor Cooling tower performance The cooling towers will be monitored via the following performance data: Cooling water flow Cooling range Heat load per tower Relative heat load per tower
For more information, please contact your local Siemens sales representative.
Resulting flow rate FR (= relative cooling water flow, based on nominal flow)
Siemens Energy, Inc. Instrumentation, Controls & Electrical 1345 Ridgeland Parkway Alpharetta, GA 30004 USA Tel: +1 (678) 256-1500 Fax: +1 (678) 256-1553
Order No. E50001-D230-A269-X-76US Printed in USA BU 1765 IN 021100
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