1. dry
2. wet
3. saturated
4. supersaturated
wet
1. induced draft fan and chimney
2. induced draft fan and forced draft fan
3. forced draft fan and chimney
4. any one of the above
induced draft fan and forced draft fan
1. remain unaffected
2. improve
3. worsen
4. may improve/worsen depending on size
worsen
1. unburnt carbon in ash
2. incomplete combustion
3. ash content
4. flue gases
flue gases
1. supply of excess, air
2. supply of excess coal
3. burning CO and unburnt in upper zone of furnace by supplying more air
4. fuel bed firing
burning CO and unburnt in upper zone of furnace by supplying more air
1. inherent moisture and surface moisture are different things
2. in some coals moisture may be present up to 40%
3. some moisture in coal helps in better burning which is not possible with completely dry coal
4. it increases thermal efficiency
it increases thermal efficiency
1. cavitation of .boiler feed pumps
2. corrosion caused by oxygen
3. heat transfer coefficient
4. pH value of water
corrosion caused by oxygen
1. increases
2. decreases
3. remains unaffected
4. first increases and then decreases
decreases
1. increases
2. decreases
3. remains unaffected
4. first increases and then decreases
decreases
1. increases
2. decreases
3. remains constant
4. may increase or decrease depending upon the method of storage
decreases