gen 7 aux class
TRANSCRIPT
-
7/31/2019 Gen 7 Aux Class
1/31
GENERATOR
AUXILIARY SYSTEM
-
7/31/2019 Gen 7 Aux Class
2/31
GENERATORS AND ITS AUXILIARY CAN BE BROADLYDEVIDED INTO THREE SYSTEMS
A) Stator water system
B) Seal oil system
C) Gas system
D) Generator
-
7/31/2019 Gen 7 Aux Class
3/31
-
7/31/2019 Gen 7 Aux Class
4/31
POLISH UNIT
FILTERS
COOLERS
PUMPS
GAS TRAP
FLOWMETERS
CONDUCTIVITY
EXPANSIONTANK
MAKEUP
FSI
IDIFF PRESS.
MAGNETFILTER
STATOR WATER SYSTEM
-
7/31/2019 Gen 7 Aux Class
5/31
VINDHYACHAL
-
7/31/2019 Gen 7 Aux Class
6/31
STATOR WATER SYSTEM
-
7/31/2019 Gen 7 Aux Class
7/31
TEFLON
TUBES
PW HEADER
-
7/31/2019 Gen 7 Aux Class
8/31
-
7/31/2019 Gen 7 Aux Class
9/31
-
7/31/2019 Gen 7 Aux Class
10/31
-
7/31/2019 Gen 7 Aux Class
11/31
Stator Water System
Stator water cooling is a closed loop system
There are two full capacity single stagecentrifugal pumps with change over facility
The pumps are driven by 3Ph. 415V A.C. motors
The stator water cooler is shell and tube typeheat exchanger
DM water flows through shell
-
7/31/2019 Gen 7 Aux Class
12/31
Stator Water System
There are two mechanical filters and one
magnetic filters
Mechanical filters are of wire mesh type
Magnetic filter is having permanent magnet
The expansion tank is a hermetically sealed
container made of S.S.
-
7/31/2019 Gen 7 Aux Class
13/31
Stator Water System
Float valve is there in the expansion tank to
maintain water level in the tank which act as
suction storage tank for stator water pumps
Polishing unit (mixed bed ion exchanger) is there
to maintain conductivity of stator water to
desired level
-
7/31/2019 Gen 7 Aux Class
14/31
SEAL OIL SYSTEM
Generator shaft seals are supplied with
pressurized seal oil to prevent hydrogen escape
at the shaft
Oil pressure is kept higher than the gas pressure
There are one AC seal oil pp. and one DC seal oil
pp. which feed oil to the seal through cooler and
filter
-
7/31/2019 Gen 7 Aux Class
15/31
VINDHYACHAL
-
7/31/2019 Gen 7 Aux Class
16/31
BEARG
DRAINS
TG
1 2
EEBEARING
TEBEARING
GASEXHAUST
FROM GAS
SYSTEM
IOT
VACUUM
TANK
SOST
SOP
SOP-3
DC
DPSW
TS ES
FR
FLOW M.PS PG
SEAL OIL SYSTEM
-
7/31/2019 Gen 7 Aux Class
17/31
-
7/31/2019 Gen 7 Aux Class
18/31
VINDHYACHAL
-
7/31/2019 Gen 7 Aux Class
19/31
SEAL OIL SYSTEM
Both the seal oil pumps are 100% capacity screwtype pump
A vacuum pump is provided to maintain vacuum
in seal oil tank
There is a additional facility to supply seal oilfrom governing oil
The seal oil pressure to the seal is controlled byDPR which maintain specified DP between oiland hydrogen
-
7/31/2019 Gen 7 Aux Class
20/31
SEAL OIL SYSTEM
Thrust oil is there to hold the seal ring in position
against gas pressure
Two seal oil coolers having 100% capacity isprovided to cool the oil
Duplex filter is provided in the oil line
Vacuum pump evacuates gases from SOT
-
7/31/2019 Gen 7 Aux Class
21/31
H2DISTRIB
HYDROGEN
CO2VAPOURIZER
H2 DRIER
CO2
ANALYZER
DRAIN
AIR
FILTER
OP
DPI
GAS SYSTEM
-
7/31/2019 Gen 7 Aux Class
22/31
VINDHYACHAL
-
7/31/2019 Gen 7 Aux Class
23/31
-
7/31/2019 Gen 7 Aux Class
24/31
AXIAL FAN
-
7/31/2019 Gen 7 Aux Class
25/31
-
7/31/2019 Gen 7 Aux Class
26/31
ABOUT HYDROGEN
H2 and O2 combine slowly at 180C or inbright sunlight. Explosion occurs with moist
gases at 550 - 700C.
Ignition temp. of H2 in air is 538C.
Calorific value of H2 is 136 k Cal / gm.
For filling in TGs, 99.9% v/v purity gas is
used. Traces of SO2 and NH3 shall not bedetectable by analysis.
-
7/31/2019 Gen 7 Aux Class
27/31
ABOUT HYDROGEN
H2 is lightest gas with 0.09 gm / litre whileairs 1.3 i.e. 14.4 times.
Thermal capacity of H2 as gas is high.
Thermal conductivity of H2 is 5 times that ofair. Its specific heat is 3.42 at 0C, as compared
to 0.237 of air.
2 H2 + O2 mixture ignites on adiabaticcompression at 526C, 3H2 + O2 at 544C.
-
7/31/2019 Gen 7 Aux Class
28/31
H2 FILLING
Check availability of adequate no of Hydrogen
filling points and cylinders
Functionally check the LLD system
Check whether the relief valves in the high
pressure valves are alright
Check the generator is completely boxed up
Check the seal oil system is in service
-
7/31/2019 Gen 7 Aux Class
29/31
Check generator air tightness test is successfully
completed
Start purging air with CO2
till the purity of CO2
inside casing reaches above 95%
After CO2 purity reaches as desired start purging
CO2
with Hydrogen
Continue purging till hydrogen purity reaches
above 98%
-
7/31/2019 Gen 7 Aux Class
30/31
Pressurise generator casing with hydrogen up to
its design value
Recheck hydrogen leakages by detector
Take drier into service
Take gas coolers into service
Vent the coolers and establish flow
-
7/31/2019 Gen 7 Aux Class
31/31