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POWER PLANT - 67 MW - QTY. 2 - 11.6 MW GAS & 44 MW STEAM

Description POWER PLANT - 67 MW - QTY. 2 - 11.6 MW GAS & 44 MW STEAM
Ref. No. POWERPLANT190601
Year 2000
Brand GE, ANSALDO, NUOVO PIGNONE, JEUMONT IND.
Qty. 1 Second-hand complete cogeneration power plant
Mfc. General Electric (designed), Ansaldo Energia, Nuovo Pignone, Jeumont Industrie
This plant, installed in 2000, has operated in connection to a metallurgic plant, recently stopped. This plant is able to burn the waste process gas from metallurgic plant.
The natural gas is mixed with the LDG gas, it can burn the CO residual improving the calorific power of the gas. So it is great cause the low plant emissions respectful for the environment.
In the same time this recovering system emproves the capacity of the plant.
GAS TURBINE-GENERATORS
The gas turbines are multi shaft PGT10S-1s, with separate electric starter motors. There is a blast stack for each gas turbine for start up so the gas turbines can operate in simple cycle, although this mode of operation would not prove to be economical.
The air filters are single stage cartridge filter elements supplied by Donaldson.
The generators for the gas turbine are both of the Vacuum Pressure Impregnated (VPI) type, the stator bars are secured by resin and the stator is then baked in an oven. This is an ASB design, although the VPI design is proving reliable there are some concerns as it is difficult to carry out repairs should a fault develop and in some instances the entire stator has had to be shipped to the manufacturer works for repairs. There has also been a requirement for resin injection for some of these machines due to resin shrinkage.
Details of the gas turbine-generator are included in the table below.
GAS TURBINE/GENERATOR
General Specifications Gas Turbines GT1 & GT2
Service Status Mainly base load
Spacing Approximately 20 m adjacent to steam turbine TURBINE Number of units 2
Designer General Electric
Manufacturer / Year Nuovo Pignone / 2001
Compressor / Turbine Stages 11/3
Rating (MW) 11.7
Fuels Natural Gas
Speed 11,000 RPM
GENERATOR Number of units 2
Manufacturer Ansaldo Energia S.p.A.
Rated voltage (kV) 11
Rated (MVA) 13.569
Speed (RPM) 1,500
Power Factor 0.8
Connection Phases Star with accessible neutral
LUBRICATING OIL/SEAL OIL
System/type Mineral Oil
Piping Welded and flanged
Reservoir location Inside dedicated enclosure
VIBRATION MONITORING
Fixed/Portable Fixed
Alarms/Interlocks Adequate alarms
HEAT RECOVERY STEAM GENERATOR (HRSG)
The 2 off heat recovery steam generators are equipped with supplementary firing and have the added advantage in that they can operate autonomously without the need for the gas turbines to be in service. Both are equipped with a forced draft (FD) and gas recirculation (GR) fan. This helps to raise flue gas temperatures when firing syngas with a low calorific value.
HEAT RECOVERY STEAM GENERATORS (HRSGs)
General Specifications HRSG GVR1 & GVR2
Service Status Mainly base load
Spacing Approximately 15 m from gas turbine
GENERAL Number of units 2
Year Manufactured 2001
Type Single pressure, horizontal gas flow, supplementary
firing (post combustion).
HP Steam flow (T/h) 43 -71.24
HP Steam press (bar) 130
HP Steam temp (OC) 518
Boiler Fuels GT exhaust, LDG & natural gas
Drum Level Control Via 3 level transmitters (differential pressure) with
2/3 voting logic.
Boiler interlocks (level, temp, press) Adequate, includes independent remote drum level
monitoring in control room via fibre optics.
BOILER FEED PUMPS
Driver Electric motor - 3 off 50 % Capacity pumps supply
MISCELLANEOUS
Water Chemistry Testing/Controls
Online analyses for pH, conductivity, dissolved oxygen, sodium and silica are monitored continuously online. The HRSG is dosed with phosphate and carbo-hydrazine.
STEAM TURBINE-GENERATOR
The steam turbine is of Siemens design and includes three bleeds which supply the deaerator, condensate preheater and 5 tih of steam for the steel works although this is no
longer used.
STEAM TURBINE
General Specifications Steam Turbine
GENERAL Service Status Base load
Spacing Approx. 20 m adjacent to gas turbines
TURBINE
Type, N® of cylinders & reheat Single flow, single cylinder condensing, 1 stage
action, 62 stages reaction, no reheat
Rating MW 44.5
Speed RPM 3,000
Stop Valve 1
Control Valve 1
GENERATOR
Designer / Manufacturer Jeumont Industrie
Year Manufactured 2000
Model # JISALT 255
Rated voltage (kV) 11
Rated (MVA) 51.5
Speed (RPM) 3,000
Power Factor 0.8
Connection Phases Star with accessible neutral
STEAM
Steam Pressure (bar) 110
Steam Temp C 510

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