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1. Stator Winding Liquid Cooling System 2. Generator Shaft Seal System 3. Generator Gas Control System 1.1 Function 1.2 Operating Procedure 1.3 Monitoring (Alarm) 1.4 Components 1. Stator Winding Liquid Cooling System 2. Generator Shaft Seal System 3. Generator Gas Control System 1.1 Function 1.2 Operating Procedure 1.3 Monitoring (Alarm) 1.4 Components 1. Stator Winding Liquid Cooling System 2. Generator Shaft Seal System 3. Generator Gas Control System 1.1 Function 1.2 Operating Procedure 1.3 Monitoring (Alarm) 1.4 Components
Generator Auxiliary System Design 2013 10 Generator Design Team This document is the informational asset of Doosan Heavy Industries & Construction Thus, unauthorized access, revision, distribution and copying of this document are strictly prohibited. SUMMARY Stator Winding Liquid Cooling System Generator Shaft Seal System Generator Gas Control System Table of Contents STATOR WINDING LIQUID COOLING SYSTEM 1.1 Function 1.2 Operating Procedure 1.3 Monitoring (Alarm) 1.4 Components 1.1 Function • COOLING OF GENERATOR STATOR WINDING • CONTROL OF COOLING WATER FLOW AND TEMPERATURE • MAINTAINING CONDUCTIVITY OF COOLING WATER (Remove the Ion from cooling water ) Hot liquid Cooled liquid 1.1 Function DESIGN AUTOMATIC CONTROL OF COOLING WATER TEMP : INLET TEMPERATURE MIN 42 DEG C ~ MAX 46 DEG C MAINTAINING CONDUCTIVITY OF COOLING WATER BELOW 0.5 MICROMHO/CM (microsiemens) FORMING BACK UP WATER CIRCUIT TO PREVENT LOSS OF COOLING WATER (Standby pump motor for continuous cooling , Pump-A or Pump-B, x 100%) FORMING CLOSED LOOP TO MAINTAIN CONDUCTIVITY OF COOLING WATER STAINLESS MATERIAL USED TO PREVENT CORROSION 1.2 Operating Procedure THE GENERATOR STATOR WINDING LIQUID COOLING SYSTEM SHALL PROVIDE A CONTINUOUS SUPPLY OF COOLING WATER TO THE GENERATOR STATOR WINDING Make-up Water Come into System GENERATOR Make-up Filter Strainer Deionizer Main Filter Storage Tank Flow Cont Valve Pump A or B Run Make-up Filter Cooler A or B Run Temp Cont Valve 1.3 Monitoring (Alarm) Storage Tank Level High / Low Water Pump Discharge Pressure Low Main Filter & Deionizer Differential Pressure High Cooling Water Flow : Low-Low Cooling Water Conductivity High/High-High Cooling Water Temp High / High-High Cooling Water Inlet Pressure : Low-Low 1.4 Components STATOR WINDING COOLIN WATER TANK The stator winding cooling water tank has several functions It is a source of water for the pumps and maintains a water level which satisfies pump suction head requirements A liquid level switch is mounted in the tank to provide high and low water level alarm contacts PUMP STORAGE TANK STATOR COOLANT PUMP ( x 100% ) Two full capacity pumps are supplied to meet redundancy requirements 1.4 Components STATOR WATER COOLER ( x 100% ) x 100% capacity plate type heat exchangers are supplied The deionized water flows through the hot side of cooler The closed cooling water flows through the cold side of cooler MAIN FILTER A filter capable of removing all particles larger than three microns is installed after the flow control valve to prevent plugging the small passages in the stator bars MAIN FILTER STATOR COOLER 1.4 Components MAKE-UP FILTER A filter capable of removing all particles larger than three microns is installed before the Deionizer DEIONIZER The deionizer is a stainless steel tank holding a quantity of resin The resin cannot be regenerated and must be replaced if conductivity cannot be maintained below 0.5 micromho/cm DEIONIZER MAKEUP FILTER 10 2.4 Components FILTER Particulate matter shall be removed from the oil by filter The filter elements are rated at microns LIQUID LEVEL DETECTOR A liquid level detector for SODE is provided to warn of an increasing level in the seal oil drain enlargement which could lead to oil backing up into the generator casing FILTER 18 2.4 Components FLOAT TRAP Seal oil flows from the seal oil drain enlargement into the float trap, which allows oil to flow through the float valve while preventing hydrogen machine gas from escaping 19 2.5 CAUTION (Operate Float Trap) 20 2.5 CAUTION CAUTION of seal oil overflow BY SEAL OIL DRAIN LINE PLUGGING - If float valve of float trap is out of control or if seal oil drain pipe is plugged or if valve is closed opposite to normal open status, seal oil can be overflowed into Generator inside - By Liquid detector, it can be monitored and alarmed to operator before over flood BY FLOAT TRAP INEXPERIENCE OPERATION - It was normally happened at initial operation under ~ 0.4 kg/cm 2g pressurizing - Before start, stop operating Generator, be caution to operate float trap - Refer to the page 19 not to waste the recovery time, money and quality - By Liquid detector, it can be monitored and alarmed to operator before over flood 21 Table of Contents GENERATOR GAS CONTROL SYSTEM 3.1 Function 3.2 Operating Procedure 3.3 Monitoring (Alarm) 3.4 Components 22 3.1 Function • CONTROL OF HYDROGEN GAS INSIDE GENERATOR H2 : The generator interior components (rotor, core) are cooled by H2 gas CO2 : CO2 Gas is used as an intermediate gas so that air and hydrogen not mix inside the generator • MONITORING HYDROGEN GAS CONDITION 23 3.1 Function DESIGN CONSIDER SAFE SUPPLY AND DISCHARGE OF HYDROGEN GAS CO2 Gas is used as an intermediate gas so that air and hydrogen not mix inside the generator INCREASED GENERATOR CAPACITY WITH SAME SIZE COMPARED TO AIR COOLING Hydrogen cooling capacity compared to air : 3~4 times 24 3.2 Operating Procedure The gas control system has the dual function of supplying hydrogen (H 2) to the generator as required to maintain selected pressure and to supply carbon dioxide (CO 2) and H2 to the generator for purging and filling operations The CO2 gas is used as intermediate median in order to prevent hydrogen gas and air Therefore there will be not hydrogen gas and air mixture REMOVING AIR FROM THE GENERATOR GENERATOR STANDSTILL SHAFT SEALING SYSTEM OPERATION CO2 GAS WILL BE SUPPLIED TO PURGE AIR GENERATOR WILL BE FILLED WITH CO22 GAS ( MORE THAN CO22 70%) 25 3.2 Operating Procedure FILLING GENERATOR WITH HYDROGEN GENERATOR STANDSTILL SHAFT SEALING SYSTEM OPERATION THE HYDROGEN GAS WILL BE SUPPLIED TO PURGE CO2 GAS GENERATOR WILL BE FILLED WITH H22 GAS ( MORE THAN H22 90%) THE H2 GAS SHALL BE SUPPLIED UNTIL IT REACHES ABOVE 99% PURITY AND REQUIRED PRESSURE(5.27 KG/CM2) 26 3.2 Operating Procedure REMOVING HYDORGEN FROM THE GENERATOR GENERATOR STANDSTILL SHAFT SEALING SYSTEM OPERATION THE CO2 GAS WILL BE SUPPLIED TO PURGE H2 GAS GENERATOR WILL BE FILLED WITH CO22 GAS ( MORE THAN CO22 95%) REMOVING CO22 FROM THE GENERATOR GENERATOR STANDSTILL FRO MAINTENANCE AIR WILL BE SUPPLIED TO PURGE CO2 GAS ( MORE THAN AIR 95%) 27 3.3 Monitoring (Alarm) Generator Gas Pressure High / Low H2 Purity in the Generator : Low Gas Dryer Malfunction Warn of water and/or oil originating from the generator : Liquid Level Detector Full 28 3.4 Components H2 / CO2 MANIFOLD H2 manifold has these features CO2 manifold has the same features: - Pigtails - Shut-Off Valve, one for each gas bottle - Pressure Regulator Gas Control Valve Assembly The gas control valve assembly is the operator’s control station during purging - Pressure Gauge - Line Shut-Off Valve - Pressure Relief Valve - Pressure Regulator 29 3.4 Components Hydrogen Control Cabinet The main purpose is to analyze and, in real time, display the hydrogen gas purity on built-in numeric displays •Generator normal hydrogen purity •Low Alarm hydrogen purity : 98% : 95% •Low-Low Alarm hydrogen purity : 90% Gas Dryer Remove moisture from the hydrogen machine gas during normal operation of the generator The equipment largely consists of two tower’s drying tower & heater and control panel It continuously produces dried H2 gas by using one tower to dry and other to regenerate repetitively 30 3.4 Components Liquid Level Detector The liquid level detector for Generator Frame is provided to warn of water and/or oil originating from the generator Drain ports are located in the low points of the generator Liquid that enters these ports is routed to the generator casing liquid detector 31 Thank you 32 ...SUMMARY Stator Winding Liquid Cooling System Generator Shaft Seal System Generator Gas Control System Table of Contents STATOR WINDING LIQUID COOLING SYSTEM 1.1 Function 1.2 Operating Procedure... FROM TURBINE LUBE OIL SYSTEM 13 2.2 Operating Procedure THE GENERATOR SHAFT SEAL OIL SYSTEM PROVIDES OIL TO THE HYDROGEN SEALS TO PREVENT THE HYDROGEN GAS LEAKAGE FROM GENERATOR INSIDE GENERATOR. .. Operating Procedure THE GENERATOR STATOR WINDING LIQUID COOLING SYSTEM SHALL PROVIDE A CONTINUOUS SUPPLY OF COOLING WATER TO THE GENERATOR STATOR WINDING Make-up Water Come into System GENERATOR Make-up