Preset at Ion on Boiler Auxiliaries

8/14/2019 Preset at Ion on Boiler Auxiliaries

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WelCome

ToPresentation

Boiler Auxiliaries

By Mustak Malek

Engineer-Mech


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Fans

Introduction

Working Principle / Fan Sizing

Classification of Fans / Application of Fans

Constructional Features

Controls

Accessories


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Introduction

Fan is one of the many types of turbo

machines used for energy transfer.

It can be defined as a rotating machine withbladed impeller which maintain continuous

flow of air or gas.


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Working Principle

It is possible that energy transfer can be

from machine to flowing fluid or vise-versa.

Fans, Blowers, Compressors, Pump etc.

falls under one category, where energytransfer occurs from the machine to fluid.

I.e. Mechanical energy is converted to Fluid

energy. Turbine falls under another category where

fluid transfer energy to machine.


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Fan Sizing

The basic information needed to select a

Fan are:

Air or Gas flow - in Kg/Hr or Cub M/Sec Density - in Kg/Cub.M

System Resistance (Losses)


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Classification of Fans

Radial Fan:

Backward Curve

Forward Curve

Straight Curve Single Suction

Double Suction

Axial Fan:

Impulse Type

Reaction Type


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TYPE OF FANS

Primary Air Fan - 02 Nos. per boiler.

Secondary Air Fan - 02 Nos. per boiler.

Induced Draft Fan- 02 Nos. per boiler.


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APPLICATION OF FAN

The Basic functions of Fans are

Supplying air for Combustion.

Circulation of bed material.

Maintaining the Draft.


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Application of Fan

Three Fans Application: Forced Draft Fans: Take air from

atmosphere at ambient temperature and

supply all the combustion air to boiler. Speedvaries between 600 to 1500 rpm.

Induced Draft Fans: Suck the flue gas from

furnace and throw out in to the stack. Handle

hot dirty gases at 125 to 200 degreecentigrade. Speed less than 1000 rpm.


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Application of Fan

Primary Air Fan: Take air from

atmosphere at ambient temperature and

supply to furnace for fluidization of Bed

material. Similar to FD Fan. Speed is more

than 1500 rpm.


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SECONDARY AIR FAN DATA

Type - SIBAB-24.

Location - Outdoor.

Medium handled - Air

Capacity - 41.11 NM3 / Sec.

Total Head developed - 151 mbar.

Temperature of Medium - 50o C.

Specific Weight of Medium- 1.1 Kg / M3.

Speed - 1490 rpm.

Motor rating - 1250 kW.

Fan bearing lubrication - Servoprime 68.

Motor bearing lubrication - Grease.

No. per Boiler - 02


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INDUCED DRAFT AIR FAN DATA

Type - NDZV28 SIDOR.

Location - Outdoor.

Medium handled - Flue gas

Capacity - 122.56 M3 / Sec.

Total Head developed - 406 mmwc.



Speed - 740 rpm.


Fan bearing lubrication - Sump oil VG68.

Motor bearing lubrication - Grease.

No. per Boiler - 02


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PRIMARY AIR FAN DATA

Type - HIIA-67-5-ALK.

Location - Outdoor.

Medium handled - Air

Capacity - 33.18 M3 / Sec.

Total Head developed - 265.47 mbar.



Speed - 2980 rpm.


Fan bearing lubrication - Servoprime 46. Motor bearing lubrication - Servoprime 46.

No. per Boiler - 02


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Spiral Casing: The casing is fully welded

structure with stiffened by rolled section

both inside & outside. The inlet cone which

forms the entrance to spiral casing help in

accelerating the flow. IGV is mounted on

the inlet flange of cone. Manhole is

provided in spiral casing. Spiral casing isrest on the foundation by four footings.


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Impeller: The impeller is welded structureconsisting of back plate, cover plate impeller ring,

blade & hub. Impeller fixed on shaft with taper

hub. Impeller is dynamically balanced.

IGV Assy.: It is one piece housing fixed at inletcone. Blades of IGV fixed with rivet on shaft. All

the shaft are connected to ring through angular

lever. The ring is externally operated through

power cylinder/servo motor.


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Shaft: It is dynamically balanced hollowtube at center & solid pin welded at both

end. The shaft ends are machined.

Bearings: The shaft & Impeller assy. ismounted on Journal Bearings. One is

locating bearing and other is free bearing.


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Controls Different types of Controls are:

Damper Control: This is the least effective of

all control.

IGV Control: This is used in both radial &

axial fans. This is more effective than dampercontrol.

Speed Control: This is achieved by either

hydraulic coupling or variable speed electricmotor.


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Accessories

Oil System: External forced oil system

given for axial & radial fans.

In axial fan oil system is used for control &

lubrication, while in radial fan it is used forlubrication.

The system as a whole is compact unit with

pump,motors, coolers,filters,instrumentation etc.


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Accessories

Silencer: Silencer are provided in PA & SAfan to reduce noise level.

Cooling System: Water cooling system is

provided for cooling of bearings andbearing oil.


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BLOWERS

Introduction

Working principle

Classification of blowers Application of Blowers


Accessories


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Introduction

Blower is one of the many types of turbo

machines used for energy transfer.

It can be defined as a rotating machine withlobes which maintain continuous flow of air

or gas.

Pressure develop is more than fan.


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Working Principle

It is possible that energy transfer can be

from machine to flowing fluid or vise-versa.

Fans, Blowers, Compressors, Pump etc.

falls under one category, where energy

transfer occurs from the machine to fluid. I.e.

Mechanical energy is converted to Fluid

energy.


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Classification Of Blower

Two lobe

Three lobe


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Application Of Blower

The Basic functions of Blowers are

Fluidization of Bed Material.

Circulation of Bed Material.

Sealing of various opening.

Conveying of Bed Material

INTRODUCTION:


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INTRODUCTION: The Basic functions of Blowers are

Fluidization of Bed Material.

Circulation of Bed Material.

Sealing of various opening.

Conveying of Bed Material.


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FBHE BUNDLE/ EMPTY CHAMBER


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FBHE BUNDLE/ EMPTY CHAMBER

BLOWER DATA Type - DN 300, Blower size GM130L.

Medium handled - Air. Location - Indoor.

Orientation - Vertical Suction / Discharge.

Capacity - 117 M3 / Min.

Intake Pressure - 0.987 mbar.

Discharge Pressure - 1.637 mbar.

Intake Temperature - 46O C.

Discharge Temperature - 115O C.

Speed Blower / Motor - 2240 rpm. / 1475 rpm.

Coupling Type - Belt driven.

Motor Rating - 190 kW.

SEAL AND PURGE AIR BLOWER


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SEAL AND PURGE AIR BLOWER

DATA Type - DN 300, Blower size GM150S.



Capacity - 100.2 M3 / Min.

Intake Pressure - 0.987 mbar. Discharge Pressure - 1.887 mbar.



Speed Blower / Motor - 1340 rpm. / 1488 rpm. Coupling Type - Belt driven.


SEAL POT BLOWER DATA


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SEAL POT BLOWER DATA

Type - DN 300, Blower size GM35S.



Capacity - 35.7 M3 / Min.






BED ASH BLOWER DATA


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BED ASH BLOWER DATA

Type - DN 300, Blower size GM25S.



Capacity - 20 M3 / Min.







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Cylinder: It is the main chamber of blower,

where lobes are fixed in close tolerance

with cylinder and with each other.

Gear Housing: It is located at NDE side.

Gears are placed in housing. One gear is

on drive shaft and the other is on driven

shaft. Shafts are mounted on bearings.Chamber is filled with lubrication.


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Housing Cover: It is located at DE side.

Bearings are placed in the housing cover.

Chamber is filled with oil for lubrication.

Intake Filter: It is provided on top of the blowercylinder. It prevent any foreign material coming

into the lobes & cylinder.

Belt Drive:


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Accessories

Relief valve: Release the pressure in case

of sudden increase in discharge pressure

NRV: Provided at discharge line to prevent

reverse rotation of blower

Hinged motor Support: Used for adjusting

belt tension.


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Soot Blower

Introduction

Type of Soot Blower

Selection of Soot Blower Constructional Features


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Introduction

All fossil fuels leaves a residue of combuston I.e. ash.

For continuous operation removal of ash is essential.

Ash particles are carried through the gas stream. This

ash may settle in the furnace walls, pressure parts coils,

APH tubes and gas passes. Some means must be provided to dispose of the ash.

This is achieved by Soot Blower.


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Type of Soot Blower

Long Retractable Soot Blower: Mainly

used for cleaning of SH, RH zone. Lance

tube of soot blower retracted completely

from heating surface.

Half Retractable Soot Blower: Mainly

used for cleaning of low temp. SH,

Economiser zone. Half lance tube of sootblower retracted from heating surface.


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Type of Soot Blower

Wall Deslagger: Mainly used for cleaning

of furnace walls.

Rotary Blowers: Mainly used for cleaning

of package boilers heating surface.


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No. of Soot Blower

No. of soot blowers per Boiler: Long retractable Soot Blower: 8 nos.

Half retractable soot blower: 24 nos.


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Selection of Soot Blower

Gas temperature at location

Type of ash deposit

Arrangement of heating surface


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Rotary motion Gear Box: It provides

rotary motion to lance tube.

Transverse motion Gear Box: It provides

transverse motion to lance tube.

Travelling Carriage Assy.: The lance is

attached to travelling carriage. Lance get its

rotary & transverse motion through TC


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Puppet Valve head Assy.: This controls

the flow of medium (Steam) to lance. It

operated through lever provided on TC.

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Preset at Ion on Boiler Auxiliaries