Hp Bypass System and Reheater Protection Logic
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Transcript of Hp Bypass System and Reheater Protection Logic
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INSTRUMENTATION
PRESSURE MEASUREMENT:
TWO Nos. PRESSURE TRANSMITTERS PROVIDED IN THE
UPSTREAM OF HP BYPASS PRESSURE CONTROL VALVES, IN
THE MAIN STEAM LINE.
RANGE : 0 TO 200 kgs!."#
TEMPERATURE MEASUREMENT:
TWO Nos. $%TYPE DUPLE& THERMOCOUPLES ARE PROVIDED
IN EACH LINE, LOCATED AT THE DOWNSTREAM OF EACH HPBYPASS PRESSURE CONTROL VALVES.
RANGE : '00 TO ()0*C.
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PROCESS MONITORING
PRESSURE TEMPERATURE MEASUREMENT:
T+ ( -o 20 #A /og s1g/s "134 5o# -+ Pss6
-/s#1--s /4 -+ #V s1g/s "134 5o# T+#o"o67s
41g1-8 7o"ss4 1/ -+ DCS. T+s s1g/s #o/1-o4
-o g/- 1/-/ /4 9-/ 41g1- s1g/s 5o 1/-o"ks
/4 # g/-1o/.
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ALARMS, INTERLOCKS and
PROTECTION
ALARMS:
T+ 5oo1/g -+ #1/ A#s g/-4 1/ -+ s8s-#:• Pss6T#7-6 -/s#1--s 516.• M1/ s-# 7ss6 -oo +1g+.•
Do/s-# -#7-6 +1g+38 +1g+.• T"k1/g Pss6 s- 7o1/- 516.• Pss6 "o/-o 33s o7/4 #o -+/ 2;.• Pss6 "o/-o 33s "os4 ss -+/ 2;.• H8461" O1 7ss6 -oo o.• A/8 5s- o7/1/g "1-1 o7-4.• A/8 "os1/g "1-1 o7-4.
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ALARMS, INTERLOCKS and
PROTECTION
INTERLOC$S:
T+ 5oo1/g -+ 1#7o-/- 1/-o"ks 7o3144 1/ -+
s8s-#:• W+/ -+ Pss6 "o/-o 33s "os4 ss -+/ 2; /4
1/ M/6 #o4, 5o"4 "os s1g/ 1s 7o3144 -o 73/--+ 33 5o# 415- o7/.
• W+/ -+ M1/ s-# 7ss6 1s -oo +1g+, -+/ -+ Fs-
o7/1/g 431" 1s "-13-4.• W+/3 -+ 7ss6 "o/-o 33 1s o7/4 #o -+/
2;, -+/ -+ sso"1-4 S78 "o/-o 33 1 s1-"+o3 -o A6-o #o4, 15 1- s 1/ M/6 #o4
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ALARMS, INTERLOCKS and
PROTECTION
PROTECTION:
T+ 5oo1/g -+ 1#7o-/- 1/-o"ks 7o3144 1/ -+
s8s-#:
•
W+/ -+ 4o/ s-# -#7-6 o5 Pss6 "o/-o 33s1s -oo +1g+ o +/ -+ "o/4/s 3"66# 1s o, -+/ -+
Pss6 "o/-o 33s "os4 o/ 71o1-8.
• W+/ -+ T6
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HP / LP BYPASS SYSTEMHRH
MSL
BOILER
BP
HPT MPT LPT
CRH
CRH NRV
LBP LPC CO
N
LBP
E
BFP
BPE
BD
LEGEND
BP : HP BYPASS VALVE BD : HP SPRAY ISOLATION VALVE CON : CONDENSOR
LBP: LP BYPASS VALVE BPE : HP SPRAY VALVE LBPE : LP SPRAY VALVE
BFP: BOILER FEED PUMP CRH : COLD REHEAT LINE LPC : LP COOLER
HPT: HIGH PRESSURE TURBINE HRH : HOT REHEAT LINE LPT : LOW PR. TURBINE
MSL: MAIN STEAM LINE MPT : MEDIUM PR. TURBINE
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HP BYPASS CONTROL SCHEME
=
P
T
=
MAIN STEAM LINE
BD
BPEMASTER
PRESSURE
CONTROLLER
TEMPERATURE
CONTROLLER
PRESSURE
SET POINT
STATION
TEMPERATURE
SET POINT
STATION
To CRH
To TURBINE
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Reheater Protection Logic