8/6/2019 Rotary Soot

1/8

Rotary Soot Blower

RotarySootBlower

General Description

Operation of RB1M

Operation of RB1E

Features

Advantages

8/6/2019 Rotary Soot

2/8

General Description

Rotary Soot Blower

Contd...

BHEL Model RB 1E and RB 1M Rotary Soot Blowers are

designed to clean convection surfaces of packaged or

field erected industrial boilers where the temperature does

not exceed 980C. Above this temperature, retractable

type soot blowers are usually recommended.

The blowing element of the Rotary Soot Blower remains in

the boiler at all times, supported by element bearings

usually attached to the boiler tubes. Specially designed

nozzles are located on the element (as required) for each

specific installation. Saturated or super-heated steam, or

compressed air, may be used as the blowing medium.

To prevent infiltration of corrosive furnace gases through

the element to the valve head, a scavenging air check

valve is furnished on all RB 1E and RB 1M heads for

pressurized furnace Boilers.

8/6/2019 Rotary Soot

3/8

Contd...

For pressurized furnaces a purging air line from a source

of higher pressure than the furnace is connected to this

scavenging air valve.

The Model RB 1E is an electric motor driven unit and

Model RB 1M is manually operated.

Operation of RB1M

An exclusive two-step gear train gives a 15:1 ratio

between the chain wheel and the valve. Operation

requires only pulling the chain on the wheel, which opens

the valve almost instantaneously with respect to element

rotation.

The valve can be adjusted to bring the blowing media to

the correct pressure through the set screw provided on thevalve lever even while blowing. All surfaces can therefore

be cleaned at optimum pressure and efficiency.

Rotary Soot Blower

8/6/2019 Rotary Soot

4/8

Rotary Soot Blower

Contd...

The element rotation is normally clockwise, facing the

boiler. Recommended speed is 2 rpm. The valve closes

automatically at the end of the preset blowing arc.

The blowing arc may be changed at any time by merely

changing the cams on the main gear.

The drive motor rotates the element, through the bull

and pinion gearing, in a full 360 degree arc about its

axial centerline. Rotation is normally clockwise at 1.25

rpm. Blowing medium admission is controlled

mechanically through a cam operated valve in the head.

It is shut off when the blowing sweep is completed. The

blowers are designed for either individual operation or

for use in a sequential system.

Operation of RB1E

8/6/2019 Rotary Soot

5/8

Operation of RB IE

Rotary Soot Blower

Contd...

12

3

4

56

The blowing sweeps are regulated by pre-

selected cams mounted on the bull gear. The

"Poppet" type valve is mechanically held openduring the blowing cycle. The valve automatically

closes after completion of the blowing sweep.

After initiation from a start signal, the model RB1E

Rotary Blowers are automatically self-controlled.

The proper stop point is determined by limit

switch, positively driven by the bull gear toeliminate the possibility of phase shifting between

the blowing arc and rotary blowers stop position.

All the blowers are suitable for sequential operation. The blowers cut in, blow, cut out and bring the

next blower in series. Only the first blower need be started.

Features

Blowing Pressure Easily Adjusted - Merely loosen lock nut (1) and turn set screw (2) in

clockwise direction to increase blowing pressure. A pressure tap on the head permits installation of

pressure gauge, so exact blowing pressure may be known.

8/6/2019 Rotary Soot

6/8

Blowing Arc Readily Changed -

Merely add or remove cam segments (3)on main gear. No need to remove head

or cut new cams.

Elements Easily Removed -Simple

three step procedure. Element is

attached by means of four studs (4) and

a flange (5). Remove bolts, lift head out,

slide element out for inspection and/or

replacement. No special tools required.

Main and Power Gears Covered - Final drive pinion is heat treated for maximum

service.

Head Construction - Valve heads and flanges are made of cast steel for maximum

2pressure of 54 kg/cm .

Features

Rotary Soot Blower

Contd...

1

2

3

4

56

8/6/2019 Rotary Soot

7/8

Features

Rotary Soot Blower

Contd...

Valve Seat and Plunger-

Valve stem and Plunger

are made of stainlesssteel for strength and

resistance to bending.

Valve disc is made flexible

to confirm to any

distortions in the seat and

achieve tight shut-off.

This line diagram demonstrates a Rotary Soot Blower installed in a boiler with

either staggered or in-line tubes. Note the arrangements of nozzles to properly

clean all tube banks. Pressurized wall box is shown.

Rotary Soot Blower Installed

8/6/2019 Rotary Soot

8/8

Advantages

Elements

1. Permits full blowing arc of 360.

2. Minimum number of moving parts for valve action

3. Adjustable pressure control is easily set for each blower

to meet optimum individual blowing pressure

requirements. Blower need not be stopped for this

adjustment.

4. All the working parts readily accessible for maintenance.

The element material is carefully selected to suit the

furnace temperature. The elements are to be supported by

welded or clamped bearings, inside the boiler (By the

Boiler maker).

Rotary Soot Blower