Supercritical Unit review
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What is a BE valve?
Boiler Extraction Valve, used to control water wall pressure during start up. close at about 7% maximum continuous rating and is located on the 14th floor.
What is a WD valve?
Controls the level in the separator at 40 inches during start up and drains to the hot well and is located in the pump room.
What is a SP valve?
Spillover valve, Maintains 950 lbs of pressure on the separator during start up or shut downs. located on the 13th or 13.5 floor
What is a FWV?
FeedWater Valve, non regulating valve located on the 7th floor it is either open or closed.Used when more feedwater flow is needed than the feed water by-pass can provide. The valve is either 100% open (after the feed water transfer) or closed.
What is a FWB?
Feedwater Bypass Valve, controls flow up to about 23% of MCR (maximum continuous rating) and is located on the 7th floor.
What is a SA valve?
- Steam Admission Valve, admits steam to the superheater section of the boiler during startup
- it is located above the penthouse or is on roof
What is a BT valve?
Boiler Throttle Valve (3), located on top of the boiler and it controls waterwall pressure from 80 to 100% MCR (maximum continuous rating) during startup
What is a BTB valve?
Boiler Throttle Bypass (3), located on the 14th floor, controls waterwall pressure up to 80% MCR (maximum continuous rating)
What is a ISPR?
Injection Superheat Pressure Regulator, located on the 13.5th floor and it controls the pressure to the IS valves, maintains 350 psi above superheater pressure.
What is an IS valve?
Injection Superheat Valve (4), located on the 14th floor, and it is used to help control superheater temps.
What is an IR valve?
Injection Reheat Valve (2), located on the 14th floor comes from the 2nd stage of the Boiler Feed pump and helps control reheat temps.
What is an IC valve?
Injection Condensate Valve, located on the B-Floor and sprays water from the condensate booster pumps into the SD (Steam Drain) line to decrease the steam temperature before it reaches the condenser, it works with the SD valve (Steam Drain Valve)
What does SCR stand for?
Selective Catalytic Reduction, reduces the NOx in the flue gas stream. uses trona and ammonia to reduce the NOx.
What is a SD Valve?
Steam Drain Valve, Controls flow through the superheater section when operating the turbine bypass system during boiler warm up.
What does JBR mean?
Jet Bubbling Reactor, another name for the scrubber. helps to remove sulfur dioxide from the flue gas.
Where does the PA fan get it's suction from?
The PA fan gets it's suction from the output of the Forced Draft Fan (FD).
Boiler Vent Valves
- Vents the boiler when being filled or drained.
- (8 vents)
Main Soot Blowing Supply Valve
Supplies steam to the soot blowing system. Located on the roof
Boiler Safety Valve (ERV):
Prevents over pressurization of the super heat section of the boiler.
6A and 6B Heater Flash Regulators:
- Removes the condensed heater extraction from the drain cooler section of the heater /
- maintains a normal heater level.
Deaerator Pegging Steam Regulator:
- Allows the deaerator to be sealed off from the separator when there is enough steam
- pressure to overcome the crossover steam. Located at the DA
Cross Over Steam Regulator to DA:
- Allows the deaerator to be sealed off from crossover steam until there is enough steam
- pressure for the deaerator to be pegged from the separator. Located at the DA
Pressurizes the penthouse. Located on the 14th Floor
Penthouse to Furnace Pressure Transmitter:
- Gives indication of penthouse to furnace
- pressure. ( .5" WC psid) Location on the 14th floor
Soot Blowing Tie Valve:
- Connects/ties the soot blowing header on unit 5, to any of the individual units 1-4 soot
- blowing headers. Located on the 14th floor
Soot Blowing Regulator:
Maintains 600 lbs of header pressure on soot blowing system and each soot blower regulates a preset pressure. located on the 14 th floor
Separator Warm-up Valves:
- (3 valves total) Supplies steam from the cold reheat line to keep the separator
- warm while not in use. located on the 14th floor
Water Wall Recirculation Valve:
Provides water wall tube protection during low load conditions.
Electromatic Relief Valve (ERV) Isolation
Opens and closes the ERV isolation valve. located on the 14th floor
ERV Air Receiving Tank:
Storage tank for air for the operation of the ERV isolation valves. located on the 14th floor
Prevents the over pressurization of the separator and is located on the 13th floor
C-60 Sludge Valve:
Used to blow down and remove deposits from the surge tank. Located on the 13th floor
Retractable soot blower:
- (Retract) cleans the slag from boiler tubes by blowing them with pressurized steam. Helps
- control boiler temperatures. locations start on the 13th floor
Fly Ash Hoppers for A and C Fly Ash System:
Collects fly ash from the boiler. location is on the 13th floor
Where saturated steam is collected and separated during start up. located on the 11th floor
- Provides a reading of furnace gas temperature during start up for protection of the
- reheat section of the boiler. located on the 10th floor
Boiler Leak Detectors:
An amplified system that helps detect leaks in the boiler.located on the 9th floor
Beck Drive Cooling Fans:
Supplies ambient air to the corners of the boiler to cool the beck drives. there are four sets of fans, one set is on the 9th floor
Separated Over Fire Air (Sofa) Dampers:
Provides over fired air to the boiler for more efficient combustion to help reduce NOx. located on the 8.5 floor
ISPR Root Valve:
- Isolation valve for ISPR valve.Closed to prevent admission of spraywater into the superheater
- section in unit trip or shutdown conditions.
Burner Line Isolation Valves:
Isolates individual burner lines from the boiler.located on the 8th floor
Auxiliary Air Damper:
- Maintains wind box to furnace differential pressure and provides secondary air above and
- below the burner nozzles.located on the 8th floor
Fuel Air Damper:
Provides fuel air to the burner in conjunction with feeder speed.located on the 8th floor
Provides a stabilized oil fire during low coal flow conditions i.e. startup and shut downs. located on the 8th floor
Provides boiler protection against flame out conditions. located on the 8th floor
Economizer Fly Ash Hoppers:
Collects fly ash from the economizer section of the boiler. located on the 8th floor
Fly Ash Hoppers for B and D Fly Ash System:
Collects fly ash from the boiler. located on the 8th floor
Dry Ash System:
Used in the removal of fly ash from the fly ash hopper to the silo area for disposal. located on the 8th floor
Boiler Circulating Pump By-Pass Valve:
Used to by-pass the boiler circulating pumps (when out of service) to provide a continuous flow of water to the center water wall tubes from the mixing chamber. located on the 6th floor
Scanner Air Fans:
Provide cooling / aspirating air to flame scanners. located on the 6th floor
Air Heater Guide Bearing:
The purpose is to hold the rotor in a vertical alignment while allowing for Air Preheater rotation. located on the 6th floor
Boiler Water Circulating Pumps:
Used to circulate water through the water wall tubes during low load conditions to prevent over heating and damage of the tubes.located on the 5th floor
Used to raise or lower the burner nozzles to help control boiler temperature.located on the 5th floor
Air Heater Soot Blower:
- Cleans the air heater baskets of fly ash during normal operation and to remove lighter
- oil carry over during start up or shut down. located on the 5th floor
- Preheats the secondary air which increases combustion efficiency and preheats primary
- air to help dry the coal and temperate the coal for more efficient combustion. located on the 5th floor
Air Heater Gear Box:
The gear box is what drives or turns the air heater. located on the 5th floor
Pre-boiler Valves 903A and 903B:
- Isolates the pre-boiler line during normal operations, which is used during start up to
- circulate water through the feed water system back to the hot well to help clean the water before entering the boiler.located on the 5th floor
Igniter Air Fan:
Maintains a slightly positive pressure (1.5") of differential between the igniter wind box and the boiler to ensure that the igniters do not get stopped up with ash if the boiler becomes pressurized.located on the 4.5 floor
Transformer Annunciator Cabinet:
Provides indication of alarms on the station and starting station transformer.located on the 4th floor right beside the control room
Heating Steam Pressurizing Valve:
- HSPV. Used to preheat the high pressure turbine with auxiliary/crossover steam being fed
- through the cold reheat line.
Pre-boiler Dump to The Ash Lake Valve:
- Used in Pre-boiler conditions. Water is circulated through the feed water system,
- and then this "dirty" water is dumped to the ash lake via this valve. located on the 4th floor
Forced Draft Fan Vapor Extractor:
- Used to remove any water vapor from the oil tank to help keep water from entering
- the oil system. one vapor extractor for both FDF's and is located on the 4th floor.
Forced Draft Fan Backpressure Damper:
- Holds a back pressure on the forced draft fan to keep the fan speed up and out of a
- critical vibration range. located on the 4th floor
Unit 5 Engine Generator:
Provides power to the plant in a black start condition.located behind unit 5 shop and oil house.
Heating Steam Feed Valve:
HSFV: Used to pre-warm the IP and LP turbines. located on turbine floor
Steam Seal Diverting Valve:
- Diverts steam from the steam seal unloading valve to the 17th stage heater extraction
- (#1 heater) or to the condenser depending on temperature. can be seen from turbine floor
- Opens to equalize the pressure across the reheat stop and intercept valves to
- allowing them to open. located at turbine
Gland Steam Exhauster:
- Maintains a vacuum across the gland packing seals to remove steam used to seal the
- turbine, (Main Turbine, FDF and BFP Turbines) which prevents water from
- collecting in the oil system due to steam packing leakage. located on 398 floor
Opens on a turbine trip to vent reheat steam which will prevent a possible over speeding of the turbine, and also provides a reverse flow through the high pressure turbine to cool it. located on the 398 floor
The condenser vacuum is dropping what could be the problem?
cooling towers: fans,basin nozzles,trash rack.Vacuum pumps,cooling water to pumps and seal water, heater dumps dumping or leaking to the condenser,BFP condensate return to the condenser, the DEA overflow to the condenser
What does the gas cooling pumps do?
sprays the slurry into the gas flow to cool the gas before it enters the vessel and is also used for the deck wash.
Name the oil pumps on the main Turbine oil tanks.
motor suction pump supplies oil to the main turbine shaft driven oil pump,Turning gear oil pump is for when the turbine is on gear, DC or emergency oil pump for when we have a loss of AC power
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