4Th Class Power Engineering Chapter 62

Front 1

Two types of soot blower cleaning mediums?

Back 1

Compressed air and dry superheated steam

Front 2

Two types of soot blower systems used in solid fuel - fired boilers

Back 2

Retractable

Stationary

Front 3

Ash that builds up on furnace wall tube is referred to _______.

Back 3

Slag

Front 4

Retractable soot blowers penetrates the furnace wall _______mm to ________mm and cleans approximately a _________ m radius.

Back 4

25 mm to 51 mm

1.5 m

Front 5

Furnace pressure should be ________ atmospheric to prevent blowback through inspection doors and other openings.

Back 5

Below

Front 6

Shot cleaning pellets have a diameter of approximately

A. 1.0 mm

B. 025 mm

C. 6.0 mm

D. 125 mm

Back 6

C. 6.0 mm

Front 7

During a sootblowing operation the boiler firing rate should be at least:

1) 20%

2) 80%

3) 15%

4) 70%

5) 30%

Back 7

5) 30%

Front 8

A long retractable sootblower will:

1) Be used to clean furnace walls

2) Blow during extension and retraction as it rotates

3) Have nozzles throughout its full length

4) Not blow until fully extended

5) Require less exterior room than a furnace wall unit

Back 8

2) Blow during extension and retraction as it rotates

Front 9

In addition to reducing heat transfer, soot and ash on fireside tubes also:

1) Increases draft fan power requirements

2) Results in the formation of CO in the flue gases

3) Lessens the chance of furnace explosions

4) Raises superheater temperatures

5) Results in smoke emissions from the stack

Back 9

1) Increases draft fan power requirements

Front 10

Stationary sootblowers should not be used in the area of the:

1) Convection heating zone of the boiler

2) Air preheater

3) Reheater

4) Secondary air heater

5) Economizer

Back 10

3) Reheater