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Descripción: AXERA
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Feedwater System Power Generatio Generatio n
Feedwater System Functions Provides deaerated and preheated feedwater to the HRSG HP and IP steam drums Supply feedwater to various desuperheaters and to the condensate preheater system.
IP
HP
IP desuperheater HP desuperheater
Provide injection water for HPdesuperheater and reducing station Keep Min. flow of feedwater Pump
Supply feedwater from condensate preheater to IP- and HP drums via IP- and HP- economizers
from CEP
Provide extracted feedwater for condensate preheating
HP reducing station
Provide injection water for IP-
Feedwater System Functions HP Feedwater to HP Economizer (~ 1000 gpm at 4475 feet of differential head) HP Feedwater to HP Superheater Attemperator HP Feedwater to the HP ST By-pass Station HP and IP Feedwater to the Sampling System HP Feedwater Minflow to Condensate System IP Feedwater to IP Economizer (~ 175 gpm at 1183 feet of differential head) IP Feedwater to Reheater Attemperator LP Take-off to Condensate Recirculation (~ 350 gpm at 252 feet of differential head) Drains and Vents to the Drain System
Feedwater System COND PRHTR
PT
610 PSIG
STRAIN ER
TT
610 PSIG
PT
BFP
STRAIN ER
PT
BFP
ARC
ARC
VALVE
VALVE
PT
IP DRUM
PT
HP
Feedwater Pump Design
Designed to provide adequate flow rates at required pressure for startup, shutdown, normal and ST bypass operation. Takes suction from the condensate preheater (CPH). Min flow line discharges to the main condensate line upstream of the CPH. Desig n features
Horizontal, radial split, ring-section pump with radial impellers, single-flow entry Motor-driven, constant speed 1750 Hp, 6600 VAC, 3 phase, 60 IP feedwater and condensate recirculation extraction Y-type suction strainer Automatic recirculation valve (min. flow) for pump protection (one valve per pump) Supply for both HRSGs Integral self contained lubrication sys (brg oil sump) Oil Slinger Ring System Oil cooler cooled by CCW
Boiler Feedwater Pump
Boiler Feedwater Pump Features
Shaft seals located at each End of the pump CCW supplies cooling water to these shaft seals. Each Closed Cooling Water return line and bearing oil return line has a flow indicator Proper axial shaft positioning – accomplished with a lift off device and a Balance Piston. Lift off device – Uses a spring to provide a small amount of thrust on the shaft for proper axial shaft positioning on pump startup. Balance piston provides for proper axial shaft position in the pump casing after startup
Feedwater Pump Suction Relief Valve
Self Actuating Relief Valve @ 610 psig Minimu m Flow Recircu lation Control Valve (ARC Valve)
Provides a minimum of 431 gpm flow through the pump Prevent overheating and cavitation during startup and low flow operation. Proportional type valve Each ARC valve contains a check valve to prevent backflow through an idle pump.
Feed Pump Operation Prestart Requirements
Walk down the pump and system. Inspect for: Proper valve lineups, Correct oil levels Motor breaker closed. Feedwater Pump Protection Off (Trip)
The feedwater pumps will shut off on Protection if any of the following conditions occur: Loss of HP/IP FWP Required NPSH, OR HP/IP FW Pmp Non Drive End High High Bearing Temp > 82 C (180 F) OR HP/IP FW Pmp Drive End High High Bearing Temp > 82 C (180 F) OR HP/IP FW Pmp Non Drive End High Vibration (6 mils) OR HP/IP FW Pmp Drive End High Vibration (6 mils) OR HP/IP FW Pmp discharge pressure low – HP < 113 bar (1639 psig), IP < 26 bar (377 psig) for longer than 20 seconds No CEP Running °
Operator must initiate a start up of the feedwater system. From the OM Screen, Operator turns ON the “SLC START FEEDWATER PUMPS” SLC START FEEDWATER PUMPS - ON, “Feedwater Pump – In Auto. Commands Selected Feedwater Pump – ON if enable signals satisfied.
Feed Pump Operation
The feedwater pumps are enabled to start if: Condensate Preheater Trim Valve (11LCA30AA101) is >19% Open AND At least One CEP is Running AND CEP Common Discharge Pressure > 23.56 bar (342 psig) AND At least One Circ Water Pump is Running AND Feedwater Pump Drive End Vibration Alarm is NOT Active (<4 mils) AND Feedwater Pump Non-Drive End Vibration Alarm is NOT Active (<4 mils) AND Feedwater Pump NPSH Required to Start is Satisfied AND Both HP and IP Feedwater Block Valves Closed or Other Feedwater Pump in Operation AND No Feedwater Pump Trip Active
Standby Pump START Command: Commanded pump fails to start: Start command active > 20 seconds and HP discharge pressure < 113 bar (1639 psig) or IP discharge pressure is < 26 bar (377 psig), OR HP or IP feedwater flow increases to greater than a set value (HP – 60 kg/s, IP – 71 kg/s).
“2nd BFWP Not Needed” Alarm - Activated: Both feedwater pumps – Running Both HP flow (<52 kg/s) and IP flow (<61 kg/s) for > 20 sec
“2nd BFWP Not Needed” Alarm - Informs operator to turn off the standby pump
