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HP BYPASS
SYSTEM
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Presentation outline
Introduction to HPBypass
Components of HPBypass SystemSystem Details
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Introduction
To improve flexible operation
Dumping of excess steam to
Bypass steam from boiler when turbine isnot in service.
To quickly match steam parameters with that
of turbine metal.
To protect reheat tubes
Minimize water loss(Sh vent to be open
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H.P. BYPASS SYSTEM
H.P. Bypass system bypassed steam from MS line to CRH linebypassing HPT.
Function of HP Bypass:-
1. Raising boiler parameter during start up.
2. To warm up steam pipe lines.3. To match live steam pressure & temp before entering into turbine.
4. Quick
5. start up of turbine.
6. Bypasses the steam to HPT & during sudden unloading of
machine, tripping of machine.7. Avoid starvation of boiler.
8. Reduce losses of steam to atmosphere.
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Over view of HP bypass
system Working of By pass system (Explain Fig)
Maintains pressure before Turbine i/L
2 BP1,BP2 Upstream ,Down stream CRH
Dump excess steam to cold RH
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System details and lay out
Capacity to bypass 70% HP steam at rated flow
HP ,BPE (spray ) are hydraulic actuator
Pressurized oil is supplied from separate oil Unit
Fast opening ( Bulk load ,generator Trip, Turbine
trip )
During normal operation (sliding pressure set point)
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InterlocksOpening-
Generator circuit breaker open. Turbine trip out.
Manual command for fast opening.
Protection- Condenser vacuum too low.
Temp. to high at down stream of H.P. Bypass.
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HP BYPASS SYSTEM and
Components
Oil supply unit
Two oil pumps.
Two tanks.
Signal alarm PRESSURE TO HIGH orPRESSURE TO LOW if pressure is not in order.
02 nos. of pressure control valves
02 nos. temperature control valves
01 no. of spray water pressure control valve
01 no. of spray water pressure isolating valve
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Hp bypass control
Hydraulically operated
Steam pressure control
Down steam temperature control
Spray water pressure control.
On -off control
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C I componenets
Oil supply units
Servo valves
Blocking units
Trip close/trip open units
Filters
Regulators.
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Interlocks of hp bypass
Spray water pressure auto switching
Auto opening of spray isolation valve
Trip closing of bypass valves
Trip opening of bypass valves.
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Stage-2 systems
Hp bypass system
02 nos of control valves
02 nos of temperature control valves
01 no. of spray water isolation valve
Trip closes on
-down steam temperature very high
-vacuum is low
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THANK YOU
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