pa-fd-id fans

8/21/2019 PA-FD-ID Fans

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Tanjung Jati B Training

PA-FD-ID Fans


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Boiler Precipitator FGD Absorber

2 x 660MW (net)

P.T. Central Java PowerTanjung Jati B Units 1 & 2


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OPERATIONS

PA-FD-ID FANS


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PA-FD-ID FansLocation

PA FANS ID FANSFD FANS


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PA-FD-ID FansFunction

The fans serve to provide the following regarding

The operations of the Boiler, ESP & FGD Systems

FD FANS: Combustion Air for the Burners

ID FANS: Remove Flue Gas from the Boiler & ESP

and force the flue gas through the

FGD System to the Stack

PA FANS: Provide air for the operation of the

Pulverizers and transport of pulverized

coal to the Burners


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PA-FD-ID Fans

Forced Draft (FD)

Induced Draft (ID)

Primary Air (PA)


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FD Fans

Each FD Fan has a single inlet and provide

50% of the total airrequirement at Boiler

Maximum Continuous Rating firing Bengalon

Coal at 1% sulfur.

The FD Fans are theAxial type versus the

Centrifugal type PA and ID Fans.

Air flow through the fan is controlled by theVariable Pitch Blades.



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FD FansAxial Design

MOTOR

INLET BOX

AIR FLOW BLADES

DIFFUSER

LUBE AND/OR

HYDRAULIC UNIT

STRAIGHTENING

VANES

OUTLET AIR



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FD Fans

Secondary Air System

FD Fan

FD Fan

SCAH

SCAH

Air Heater

Air Heater

Air Foil B

Air Foil A

Burner Level

Windbox

(typical)

Inlet

Silencer

Screen

N


Hot Crossover

Duct


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ID FansFan 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 levelsite gauge. If the oil appears cloudy or frothy,

most likely cooling water has entered the oil

cavity and has contaminated.


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FD Fans

Some Components and Terms to remember

Variable Pitch Blades

Hydraulic-Lube Unit

Fan Stall



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FD FansVariable 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 thenecessary oil pressure to adjust the pitch of

the Blades.


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FD FansHydraulic Unit

The Hydraulic Unit serves two functions

Adjust the pitch of the Blades

Provide Lube Oil for the Fan Bearings


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The Hydraulic Oil Unit consists of the following

Local Control Cabinet

Two (2) motor-driven oil pumps

Oil HeaterOil Cooler

Oil Sump

Filters

Instrumentation (Flow switch, Level switch)


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The Control Cabinet has the following features

Indication Lamps

Oil Pump Status

Oil Heater StatusHigh/Low Oil Temperature

Low Oil Level

Low Oil Flow

Low Oil Pressure


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The Control Cabinet has the following features

Buttons & Switches

Oil Pump Select

Oil Pump StartOil Pump Stop

Oil Pump Hand/Off/Auto (x2)

Alarm Reset


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The Oil Pumps are interlocked such that a

significant drop in oil pressure from the

operating pump will start the stand-by

pump.


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CONTROL PANEL

OIL SUMP

OIL PUMPS


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FD FansStart-Up

Prior to starting an FD Fan, the Hydraulic Unitmust 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.


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FD FansAutomatic Operation

During automatic operation the FD Fan Inlet

Vanes will control air pressure in the Secondary Hot

Crossover Duct to the desired set point.


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FD FansTrip 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


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FD FansShutdown

Prior to stopping the FD Fan, the fans loading

should be reduced manually and slowly. This

wil l allow the other operating FD Fan to maintaincontrol of the Secondary Air Duct pressure.


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FD FansStall

Fan stall is a condition where there is a

sudden and significant drop in the differential

pressure (air f low) between the fan inlet and outlet.

A differential pressure transmitter is provided to

monitor air flow condit ions.


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FD FansStall

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.


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PA-FD-ID Fans

Forced Draft (FD)

Induced Draft (ID)

Primary Air (PA)


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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.


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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.


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PA-FD-ID FansLocation



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ID FansOperation

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 Damperwork in

unison to control the flow through the ID Fan.


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ID Fans

Flue Gas System


Man-Safe

Double Dampers

with Seal Air Tri-Sector

Air Heaters

Precipitators

Boiler

ID Fans

Start-Up

Control Damper

Guillotine Isolation

Damper with Seal Air

To FGD


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ID FansFan Bearings

The ID Fan have sleeve-type bearings which

require continuous water flow for cooling.Water is supplied by the Closed Circuit Cooling






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ID FansStart-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 anoperator should be present when the fan is started.


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ID FansStart-Up

When the ID Fan is commanded to start, the

fans Outlet Isolation Guillotine Damperwillclose. Once the dampers 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 f low and furnace

pressure prior to putting control in automatic.


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ID FansAutomatic Operation

The ID Fans inlet vanes modulate to controlFurnace Pressure only.

If two fans are running and one trips, the

remaining ID fan will control Furnace Draftwhile the unit runs back or reduces load

towards 50%.


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ID FansAutomatic Operation

How does an operator know both fans areoperating at the same load?...

The motor running amps wil l be the same!


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ID FansTrip Interlocks



High Fan Bearing Oil Temperature

Furnace Pressure High-HighLoss of Flow Path

Loss of Breaker (power failure)

High Motor Amps (time delay)


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ID FansShutdown

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.


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PA-FD-ID Fans

Forced Draft (FD)

Induced Draft (ID)

Primary Air (PA)


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PA-FD-ID Fans

Location



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Primary Air (PA) FansFunction

Two (2) 60% capacity, single-speed,

centrifugal-type primary air fans are neededfor 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



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Primary Air


MILL A

MILL B

MILL C

MILL D

MILL E

MILL F

PA Fans

Inlet Screen

and Silencer

Isolation

Dampers

Cold Air Duct

Hot Air

Duct

Tri-Sector

Air Heater

Control DampersGuillotine

Isolation Damper

To Seal

Air Fans

Air Measurement


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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






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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.


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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

GaugesJunction Box

PA F


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PA Fans

Start-Up

Prior to starting an PA Fan, an operator should

check the oil level in the bearing and be surethat 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 F


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PA Fans

Start-Up

Prior to starting an PA Fan, an operator should

also check to be sure that the Motor Lube OilSkid is started and functioning properly (no alarms).

PA F


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PA Fans

Start-Up

Prior to starting a pulverizer, a PA must be started

first. When the fan is commanded to start, the fansOutlet Isolations Damper will be commanded to close.

once the Dampers closed limit switch is activated,

the PA Fan starts. After a specified time delay, the

Outlet Isolation Damper opens.

PA F


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PA Fans

Automatic Operation

The loading of the PA Fans is controlled by variableInlet 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 F


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PA Fans

Trip Interlocks


Boiler MFT (pulverizers tripped)


High Fan Bearing Oil TemperatureLoss of Flow Path

Loss of Breaker (power failure)

High Motor Amps (time delay)

PA F


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PA FansShutdown


Similar to the other fans, the inlet vane controlsshould 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 F


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PA FansShutdown


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

PA FD ID Fans


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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)


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OPERATIONS

PA-FD-ID FANS

(END)

pa-fd-id fans

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