PA-FD-ID Fans

Tanj njun ung g Ja J ati B Tr Tr ain inii ng PA-F PA -FDD-ID ID Fa Fan ns

P.T. Ce Cen t r al J av a Po Po w er Tanju njung ng Ja J ati B Units 1 & 2

2 x 660MW 660MW (n (n et) et )

B o i l er

Pr ec i p i t at o r

FGD FGD Abso Ab sorb rber er Tanjung Jati B Training

P.T. Ce Cen t r al J av a Po Po w er Tanju njung ng Ja J ati B Units 1 & 2

2 x 660MW 660MW (n (n et) et )

B o i l er

Pr ec i p i t at o r

FGD FGD Abso Ab sorb rber er Tanjung Jati B Training

OPERATIONS PA-F PA -FDD-ID ID FA FA NS

Tanjung Jati B Training

PA-FD-ID Fans Location

PA FA NS

FD FANS

ID FA NS Tanjung Jati B Training

PA-FD-ID Fans Function

The fans serve serve to provid pro vide e the followi foll owing ng re r egarding The operation operati ons s of o f the t he Boiler, Boi ler, ES ESP & FGD FGD Sys ystems tems… … FD FANS:

Combus ombustion tion Air A ir for fo r the Burners

ID FANS:

Remo move ve Flu Flue e Ga Gas fro f rom m the t he Boiler Boi ler & ESP and force fo rce the fl flue ue ga gas s throu th rough gh the th e FGD Sys System tem to t o the t he Stack Stack

PA FANS:

Prov rovide ide air air for f or the t he opera operati tion on of the Pulv ulve eri riz zers and tr tra ansp nsport ort of pul pulveriz verize ed coal to the th e Bur Burne ners rs Tanjung Jati B Training

PA-FD-ID Fans

Forced Draft (FD) Induced Draft (ID) Primary Air (PA)


FD Fans Each FD Fan has a single inlet and provide 50% of the total air requirement at Boiler Maximum Continuous Rating firing Bengalon Coal at 1% sulfur. The FD Fans are the Axial type versus the Centrifugal type PA and ID Fans. Air flow through the fan is controlled by the Variable Pitch Blades.


FD Fans Axial Design

OUTLET AIR

AIR FL OW

BLADES STRAIGHTENING VANES

INLET BOX MOTOR

DIFFUSER

LUBE A ND/OR HYDRAULIC UNIT


FD Fans Secondary Air System Inlet Silencer FD Fan

Air Foil “ A”

Air Heater

SCAH Screen

Bur ner Level Windbox (typical)

Hot Crossover Duct

Air Heater

N Air Foil “ B”

SCAH

FD Fan


ID Fans Fan Bearings The ID Fans have sleeve-type bearings which require continuous water flow for cooling. Water is supplied by the Closed Circuit Cooling Water (CCCW) system. The bearing are also equipped with a oil level site gauge. If the oil appears cloudy or frothy, most likely cooling water has entered the oil cavity and has contaminated.


FD Fans Some Components and Terms to remember… Variable Pitch Blades Hydraulic-Lube Unit Fan Stall


FD Fans Variable Pitch Blades

Variable Pitch Blades, internal to the Fan Housing are used to control air flow through the fan. A stand alone Hydraulic Oil Unit provides the necessary oil pressure to adjust the pitch of the Blades.


FD Fans Hydraulic Unit

The Hydraulic Unit serves two functions… Adjust the pitch of the Blades Provide Lube Oil for the Fan Bearings



The Hydraulic Oil Unit consists of the following… Local Control Cabinet Two (2) motor-driven oil pumps Oil Heater Oil Cooler Oil Sump Filters Instrumentation (Flow switch, Level switch…)



The Control Cabinet has the following features… Indication Lamps Oil Pump Status Oil Heater Status High/Low Oil Temperature Low Oil Level Low Oil Flow Low Oil Pressure



…The Control Cabinet has the following features… Buttons & Switches Oil Pump Select Oil Pump Start Oil Pump Stop Oil Pump Hand/Off/Auto (x2) Alarm Reset



The Oil Pumps are interlocked such that a significant drop in oil pressure from the operating pump will start the stand-by pump.


FD Fans Hydraulic Unit CONTROL PANEL

OIL PUMPS

OIL SUMP


FD Fans Start-Up

Prior to starting an FD Fan, the Hydraulic Unit must be available and operating. If the Hydraulic Unit panel indicates any alarms, these should be investigated and cleared prior to starting the Fan. An Induced Draft Fan must be in service prior to starting an FD Fan.


FD Fans Automatic Operation

During automatic operation the FD Fan Inlet Vanes will control air pressure in the Secondary Hot Crossover Duct to the desired set point.


FD Fans Trip Interlocks

Fans will trip under the following conditions… Secondary Air Duct Pressure High-High High Fan Bearing Vibration High Fan Bearing Oil Temperature Furnace Pressure High-High Loss of Flow Path Loss of Breaker (power failure) High Motor Amps (time delay) Hydraulic Oil Unit Failure


FD Fans Shutdown

Prior to stopping the FD Fan, the fan’s loading should be reduced manually and slowly. This will allow the other operating FD Fan to maintain control of the Secondary Air Duct pressure.


FD Fans Stall

Fan stall is a condition where there is a sudden and significant drop in the differential pressure (air flow) between the fan inlet and outlet. A differential pressure transmitter is provided to monitor air flow conditions.


FD Fans Stall

Fan stall is a serious and potentially danger situation which is usually accompanied by vibration and increased noise. Fan blade failure can occur. When fan stall is suspected, the fan should be SHUT DOWN immediately.


PA-FD-ID Fans



ID Fans Description The Induced Draft (ID) Fans are single-speed, double-inlet, centrifugal-type fans. The ID Fans operate at a relatively low speed compared to the FD Fans and Primary Air Fans.


ID Fans Function The ID Fans remove flue gas from the Boiler and the Precipitator and force those flue gasses through the FGD System to the stack.



PA FANS

FD FANS

ID FANS Tanjung Jati B Training

ID Fans Operation

ID Fans, serve to control Furnace Draft Pressure during Unit operation. During start-up of the Boiler, the ID Fan Inlet vanes and Start-Up Damper work in unison to control the flow through the ID Fan.


ID Fans Flue Gas System Boiler Guillotine Isolation Damper with Seal Air Start-Up Control Damper

Man-Safe Double Dampers with Seal Air

Tri-Sector Ai r Heater s

Precipitators

ID Fans

To FGD


ID Fans Fan Bearings The ID Fan have sleeve-type bearings which require continuous water flow for cooling. Water is supplied by the Closed Circuit Cooling Water (CCCW) system. The bearing are also equipped with a oil level site gauge. If the oil appears cloudy or frothy, most likely cooling water has entered the oil cavity and has contaminated.


ID Fans Start-Up

Prior to starting an ID Fan, an operator should check the oil level in the bearing and be sure that the CCCW isolation valves are open. Be sure all housing doors are closed and an operator should be present when the fan is started.


ID Fans Start-Up When the ID Fan is commanded to start, the fan’s Outlet Isolation Guillotine Damper will close. Once the damper’s close limit switch is activated the fan will start. The isolation damper will open after a time delay. After the ID Fan is started, the operator will manually modulate both the FD & ID Fans to achieve the desired air flow and furnace pressure prior to putti ng control in automatic.


ID Fans Automatic Operation

The ID Fans inlet vanes modulate to control Furnace Pressure only. If two fans are running and one trips, the remaining ID fan will control Furnace Draft while the unit runs back or reduces load towards 50%.


ID Fans Automatic Operation

How does an operator know both fans are operating at the same load?... The motor running amps will be the same!


ID Fans Trip Interlocks

Fans will trip under the following conditions… High Fan Bearing Vibration High Fan Bearing Oil Temperature Furnace Pressure High-High Loss of Flow Path Loss of Breaker (power failure) High Motor Amps (time delay)


ID Fans Shutdown

Similar to the FD Fan, the inlet vane controls should be put into manual and the Inlet Vanes should be closed slowly. When the fan is at minimum loading, the fan can be stopped.


PA-FD-ID Fans




PA FANS

FD FANS

ID FANS Tanjung Jati B Training

Primary Air (PA) Fans Function Two (2) 60% capacity, single-speed, centrifugal-type primary air fans are needed for the following… Circulation of coal in the pulverizers Hot air to dry the coal Transport pulverized coal to the burners Primary air accounts for approximately 25% of the air flow required for combustions Tanjung Jati B Training

Primary Air Guillotine Isolation Damper

Air Measurement

Control Dampers

Cold Air Duct MILL A Hot Air Duct

Tri-Sector Air Heater Inlet Scr een and Silencer

MILL B

MILL C PA Fans MILL D

MILL E Isolation Dampers

MILL F To Seal Air Fans


PA Fans Fan Bearings The PA Fans have sleeve-type bearings which require continuous water flow for cooling. Water is supplied by the Closed Circuit Cooling Water (CCCW) system. The bearing are also equipped with a oil level site gauge. If the oil appears cloudy or frothy, most likely cooling water has entered the oil cavity and has contaminated.


PA Fans Fan Motors

The PA Fan Motors have oil-lubricated bearings which requires a stand alone lube oil skid. One lube oil skid supplies oil to both motors.


PA Fans Fan Motor Lube Oil Skid

The lube skid has very similar components to the FD Fan oil skid… Two (2) Oil Pumps Oil Sump Filters Air Cooler Oil Pressure & Temperature Switches Gauges Junction Box


PA Fans Start-Up

Prior to starting an PA Fan, an operator should check the oil level in the bearing and be sure that the CCCW isolation valves are open. Be sure all housing doors are closed and an operator should be present when the fan is started.


PA Fans Start-Up

Prior to starting an PA Fan, an operator should also check to be sure that the Motor Lube Oil Skid is started and functioning properly (no alarms

PA Fans Start-Up

Prior to starting a pulverizer, a PA must be started first. When the fan is commanded to start, the fan’s Outlet Isolations Damper will be commanded to close. once the Damper’s closed limit switch is activated, the PA Fan starts. After a specified time delay, the Outlet Isolation Damper opens.


PA Fans Automatic Operation

The loading of the PA Fans is controlled by variable Inlet Vanes. This is determined by the Primary Air Hot Crossover Duct Pressure Set Point. If two fans are in service and one trips, the Boiler load will runback to approximately 60% load.


PA Fans Trip Interlocks

Fans will trip under the following conditions… Boiler MFT (pulverizers tripped) High Fan Bearing Vibration High Fan Bearing Oil Temperature Loss of Flow Path Loss of Breaker (power failure) High Motor Amps (time delay)


PA Fans Shutdown

Similar to the other fans, the inlet vane controls should be put into manual and the Inlet Vanes should be closed slowly. When the fan is at minimum loading, the fan can be stopped.


PA Fans Shutdown

Once the last pulverizer has been shutdown, the Primary Air Fans can be stopped.


PA-FD-ID Fans General Start-Up Sequence

The start-up sequence for the fans is as follows. This assumes all fans are available… ID Fan A or ID Fan B FD Fan A FD Fan B ID Fan B ID Fan A FD Fan B FD Fan A PA Fans A/B (prior to starting a pulverizer)


PA-FD-ID Fans

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