PS5040: PROSIMULATOR TURBINE OPERATIONS …siminfosys.com/docs/PS5040 PPS Turbine.pdfPS5040: PROSIMULATOR TURBINE OPERATIONS SUITE SIM INFOSYSTEMS PVT LTD, 11,1st Cross Street, Nehru

PS5040: PROSIMULATOR TURBINE OPERATIONS SUITE

SIM INFOSYSTEMS PVT LTD, 11,1st Cross Street, Nehru Nagar, Kottivakkam, Chennai 600 041, INDIA

Phone: +91-44-24542617, Email: [email protected]. Website: www.siminfosystems.com

PS-5041: CONDENSATE SYSTEM

PROCESS DESCRIPTION:

Condenser acts as a storage tank for the condensate of steam which is collected

after its work at LP turbine, separate make-up line is taken from make-up tank for

maintaining hot-well level at 700 mm.

Condensate is pumped from hot-well with the help of Condensate Extraction Pump

(CEP) at 15 Kg/Cm2 & 45 deg C to deaerator through gland steam condenser and

4 Low Pressure (LP) heaters where the heat addition takes place gradually from 45

deg C to 150 deg C.

A recirculation line is taken after Gland Steam Condenser (GSC) to hot-well for

maintaining minimum flow in the condensate line and to maintain hot-well level.

Extraction steam serves as a source for all the LP heaters to increase the temp of

condensate.

Deaerator level is maintained at 2000 mm using a make-up station which contains

control valve and by-pass valve.

CONTROL SCHEMES:

1. One level control from make-up tank to condenser

2. One level control from for deaerator

3. One recirculation level and pressure controller from CEP discharge to condenser.

INTERLOCKS:

1. When one CEP trips another have to start in AUTO

2. When condenser level goes below 200 mm CEP have to trip and stand-by must

not start AUTO.

3. When extraction steam line is closed then temp of that individual have to drop to

its inlet value.

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PS-5042: DEAERATOR SYSTEM


Deaerator in the feed system does the removal of oxygen from feed water. It

functions as a surge tank of feed water and also forms a part of the regenerative

heating system improving the temperature of condensate from 150 to 175 deg C.

From deaerator feedwater is pumped with the help of BFP which increases its pr

from 7 to 160 Kg/Cm2 (10 to 20 Kg/Cm2 above boiler drum pressure) & 175 deg C to

boiler through 2 High Pressure (HP) heaters where the heat addition takes place

from 175 deg C to 247deg C.

A recirculation line is taken after discharge valve of Boiler Feed Pump (BFP) to

deaerator for maintaining minimum flow in BFP.

Extraction steam serves as a source for all the 2 HP heaters to increase the temp of

feedwater. Steam after heating gets condensed and forms as a drip which is again

fed into deaerator.

CONTROL SCHEMES:

1. Flow and pressure controller using BFP

2. Two level controller in both HP heaters

3. One recirculation flow controller from BFP discharge to deaerator.

INTERLOCK:

1. When one BFP trips other have to start in AUTO.

2. When deaerator level goes below 600 mm BFP have to trip and stand-by must

not start in AUTO.

3. When extraction steam line is closed then temp of that individual have to drop to

its inlet value.









PS-5043: CONDENSER VACUUM SYSTEM


Vacuum is the most essential factor in condenser which prevents back flow of steam

into the LP turbine. Also helps drive more steam through turbine

Two vacuum pumps are provided to suck the air from the condenser to atmosphere

and create a vacuum of –90 Kpa inside condenser, one pump acts as stand-by.

One vacuum breaker is provided in order to break vacuum during emergency

conditions.

Each vacuum pump is provided with a make-up separator tank which level have to

be maintained at 150 mm, shut-off valve is provided for the make-up line which

opens when the level is low.

CONTROL SCHEMES:

1. Vacuum controller provided at each vacuum pump

2. Separator tank make-up control

3. Vacuum breaker to kill vacuum

INTERLOCKS:

1. When one vacuum pump trips other have to start in AUTO

2. When vacuum drops below -80 Kpa both vacuum pump have to start

3. When separator tank level increases vacuum have to drop

4. When vacuum breaker is opened vacuum must drop to 0.

5. When hot-well level increases vacuum have to drop gradually.









PS-5044: CIRCULATING WATER SYSTEM


In circulating water systems, the waste energy that is rejected by the turbine is

transferred to the cooling water system via the condenser. The waste heat in the

cooling water is then discharged to the atmosphere by the cooling tower. In the

cooling tower, heat is removed from the falling water and transferred to the rising

air by the evaporative cooling process.

Circulating water pumps (CWP) supply cooling water at the required flow rate and

pressure 2 Kg/Cm2 to the condenser. The temp of the cooling water will rise from 35

to 45 deg C.

Circulating water is temporarily stored in the storage tank which level have to be

maintained at 6000 mm from there it is again pumped into the condenser for

cooling purpose.

CONTROL SCHEMES:

1. One temperature and flow controller at CWP

INTERLOCKS:

1. When one CWP trips then other have to start in AUTO.

2. When vacuum drops below -70 Kpa, 2nd CWP have to start in AUTO

3. When both side inlet valve closes then running CWP have to trip.









PS-5045: COOLING WATER SYSTEM


Cooling water is taken from the circulating water line and with the help of two

cooling water pumps cooling water is supplied to all the equipments in boiler and

turbine for bearing cooling purpose. The return line is taken back to the circulating

water outlet line to cooling tower for cooling purpose.

Cooling water pump develops pressure of 4 Kg/Cm2 at a temp of 35 deg C, the

return line will be in the temp of 45 deg C.

CONTROL SCHEMES:

1. Temp and flow controller at ICW pump

INTERLOCK:

1. When one ICW P/P trips then other have to start in AUTO.

2. When pressure drops below 3.5 Kg/Cm2, 2nd ICW P/P have to start in AUTO

3. When both side inlet valves closes then running ICW P/P have to trip.









PS-5046: GLAND SEALING SYSTEM


A part of the steam from auxiliary steam header is used for gland sealing in turbine

at all the bearings to avoid steam leakage from turbine.

Auxiliary steam which is at 6 Kg/Cm2 and 330 deg C will be decreased to 25 Kpa

and 330 deg C in gland steam station for gland sealing purpose.

One over-flow line is given to maintain the gland steam pr within limit 40 Kpa, one

de-superheating station is used to maintain the temp of gland steam at 120 deg C.

The condensed steam from the return line will be vented out using Gland steam

condenser fan

CONTROL SCHEMES:

1. One pressure control at gland steam station

2. One pressure control at over-flow station

3. One temperature control at de-superheat station

INTERLOCK:

1. When one GSC Fan trips then other have to start in AUTO.

2. When Gland steam pressure rises above 40 Kpa then over flow controller must

open to decrease it.









PS-5047: HP LP BY-PASS SYSTEM


By-pass system comprises of pipe work system with valves and pressure dropping

devices to enable live steam from boiler to by-pass the turbine completely during

plant startup.

For matching live steam and turbine metal temperature for quick start-up by-pass

system have to be provided.

HP by-pass is used to by-pass super heated steam to Cold Re-Heater line where its

pressure is dropped from 140 Kg/Cm2 to 30 Kg/Cm2.

LP by-pass is used to by-pass Re heated steam to Condenser where its pressure is

dropped from 30 Kg/Cm2 to 1 Kg/Cm2.

At both HP and LP By-pass one de-super heating station is provided to control the

outlet temp of the by-pass system within limit.

CONTROL SCHEMES:

1. Two pressure controller at HP & LP system

2. Two temp controller at Hp & LP De-superheating station

INTERLOCKS:

1. When turbine trips HP LP by-pass temp have to open

2. When super heater pr rises above 150 Kg/Cm2 HP LP by-pass will open









PS-5048: TURBINE STEAM EXTRACTION SYSTEM


A small fraction of steam expanding through the turbine is blend off from different

stages of turbine used to heat the feed water in feed heaters.

7 such extractions are made each one operating at different pr and temperature is

used in 4 LP heaters, 2 HP heaters and in deaerator.

Extraction 1 at 40 Kg/cm2 Pressure and 380 deg C temperature.






Extraction 7 at 0.5 Kg/cm2 Pressure and 120 deg C temperature.

Gradually feed water temperature rises from 45 to 247 deg C using this

regenerative feed heating system.

CONTROL SCHEMES:

1. 7 pressure and flow controller at each extraction stages.

INTERLOCKS:

1. When turbine trips all the extraction valves must close.









PS-5049: TURBINE LUBE OIL SYSTEM


Turbine lube oil is used for lubricating all the bearing in the TG set. Lube oil is

stored in the main oil tank from there it is pumped using lube oil pump at 1 Kg/cm2

pr and temp must be maintained between 35 to 40 deg C. After lubricating oil is

again taken back to the tank.

Jacking oil pump is used to lift the turbine shaft when the turbine gets tripped. JOP

operates at a header pressure of 100 Kg/Cm2

Starting oil pump is used during light up time which develops pr of 15 Kg/Cm2

Coolers are used to reduce the temperature of oil within limit.

CONTROL SCHEMES:

1. One pressure controller for LOP

2. One pressure controller for JOP

3. One temperature controller at cooling station.

INTERLOCKS:

1. AC LOP starts when Pressure drops below 0.8 Kg/Cm2

2. DC LOP starts when Pressure drops below 0.6 Kg/Cm2

3. JOP starts when turbine trips






Documents

PS5040: PROSIMULATOR TURBINE OPERATIONS …siminfosys.com/docs/PS5040 PPS Turbine.pdfPS5040: PROSIMULATOR TURBINE OPERATIONS SUITE SIM INFOSYSTEMS PVT LTD, 11,1st Cross Street, Nehru