Upgrade of the CCPU-420 of the Mosenergo CHPP-20 Increasing Its Efficiency
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Vol. 54, No. 4, November, 2020
POWER PLANTS UPGRADE OF THE CCPU-420 OF THE MOSENERGO CHPP-20 INCREASING ITS EFFICIENCY S. N. Lenev,1 Yu. A. Radin,2 V. I. Konovalov,1 A. I. Istomov,3 and P. V. Golov1 Translated from Élektricheskie Stantsii, No. 5, May 2020, pp. 20 – 34.
A technical solution aimed at increasing the generation and expanding the operating capacity range and successfully implemented at CCPU-420 of the Mosenergo CHPP-20 is presented. In accordance with the technical proposals by the Siemens (SGTT) as a GT supplier, several SGT5-4000F gas turbines were upgraded at Russian thermal power plants with single-shaft CCPUs, which made it possible to increase the installed capacity of these installations by 30 MW on average (so-called SP8 package). Single-shaft CCPUs were chosen for the upgrade mainly because such installations are intended to operate in condensing mode only. In 2018, the Mosenergo Company decided to upgrade the SGT5-4000F gas turbine of Power Unit No. 11 of the Mosenergo CHPP-20. It was originally designed for heating purposes and, therefore, had a SST5-5000 two-shaft steam turbine with its own electric generator and two steam extractions for PSG-1 and PSG-2 network heaters. The unit was certified by the SO-UPS based on tests at an installed capacity of 418 MW under normal conditions. The service interval of the SGT5-4000F gas turbine was set by the manufacturer at 25,000 equivalent operating hours (EOH), which corresponds to three years of operation approximately. The goals of the main inspection of the SGT5-4000F gas turbine were upgrading the gas turbine and increasing its capacity, implementing the concept of “flexible” service intervals ranging from 33,000 to 50,000 EOH, depending on the operating mode of the gas turbine. Accomplishing the second task will increase the periods of operation between inspections to 4 – 6 years, which will reduce the cost of servicing GT and CCPU equipment without reducing its reliability. Keywords: gas turbine; steam turbine; combined-cycle power unit; service interval; equivalent operating hours (EOH); installed capacity; heat-recovery steam generator; CHPP; inlet guide vanes
Mosenergo CHPP-20. It was originally designed for heating purposes and had a Siemens SST5-5000 two-shaft steam turbine with its own electric generator and two steam extractions for network heaters. According to Siemens, the design electrical capacity of CCPU-420 is 420 MW. During the commissioning in 2015, the unit was certified by the SO-UPS as having an installed capacity of 418 MW. By the beginning of the repair and upgrade, the power unit had operated for 25,000 equivalent operating hours (EOH). In addition to the repair and upgrade of the gas turbine and increasing its capacity, the main inspection of the SGT5-4000F gas turbine was intended to implement the concept of “flexible” service intervals ranging from 33,000 to 50,000 EOH, depending on the operating mode of the gas turbine. The concept allows increasing the periods of opera-
Siemens proposed to upgrade the SGT5-4000F gas
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