Which one is NOT a disadvantage of the FBC system?

Which one is NOT a disadvantage of the FBC system?

A. Carryover
B. High power requirements for combustion air
C. Large space required for installation
D. Poor combustion control at low operating rates



Answer: C

Less maintenance is required on the FBC because?

Less maintenance is required on the FBC because?

A. Slag is eliminated
B. Clinkers is eliminated
C. Soot-blowers are not required
D. Dry combustion is easier to dispose of
E. All of the above





Answer: E

What is an advantage of the FBC?

What is an advantage of the FBC?

A. Flexibility of fuel choices
B. Less maintenance
C. Smaller plant size
D. Less fuel feed
E. All of the above

Answer: E

The steam turbine in the PFBC system, about what percentage of power is produced?

The steam turbine in the PFBC system, about what percentage of power is produced?

A. 50%
B. 30%
C. 60%
D. 40%
E. 70%





Answer: D

The gas turbine in the PFBC system, about what percentage of power is produced?

The gas turbine in the PFBC system, about what percentage of power is produced?

A. 50%
B. 30%
C. 60%
D. 20%
E. 70%





Answer: C

Velocities in the AFBC system through the bed of the fluidizing air are in a range of?

Velocities in the AFBC system through the bed of the fluidizing air are in a range of?

A. 1 - 2 m/s
B. 2 - 3 m/s
C. 3 - 4 m/s
D. 4 - 5 m/s
E. 6 - 7 m/s




Answer: B

AFBC has two sub classes which are?

AFBC has two sub classes which are?

A. Pressurized bed, circulating bed
B. Bubbling bed, fluidized bed
C. Fluidized bed, pressurized bed
D. Bubbling bed, circulating bed
E. None of the above




Answer: D

The AFBC can produce up to ___ kg/h of steam but it will soon increase to ___ kg/h.

The AFBC can produce up to ___ kg/h of steam but it will soon increase to ___ kg/h.

A. 300 000 to 500 000
B. 400 000 to 800 000
C. 500 000 to 1 000 000
D. 800 000 to 1 500 000
E. None of the above




Answer: C

Which one is NOT a disadvantage of the Flue Gas Desulphurization (FGD) system?

Which one is NOT a disadvantage of the Flue Gas Desulphurization (FGD) system?

A. Required a lot of space
B. Expensive to build
C. Troublesome to operate and maintain
D. Problems with disposal of wastewater and sludge products
E. All of the above




Answer: A

In a fluidized bed boiler, a gradual loss of the fluidized bed, including fuel (carbon) particles, is due to:

In a fluidized bed boiler, a gradual loss of the fluidized bed, including fuel (carbon) particles, is due to:

a. Carryover
b. Uplift
c. Priming
d. Sootblowing
e. Clinker formation





Answer: A

A design disadvantage of a pressurized fluidized bed furnace is:

A design disadvantage of a pressurized fluidized bed furnace is:

a. Erosion and/or corrosion/fouling of turbine blades may occur
b. A wide range of fuels cannot be used
c. A great deal of maintenance is required
d. Fuel preparation is very complex
e. The boiler is too compact for ease of cleaning



Answer: A

Fluidized bed boilers can successfully burn coal with ash contents as high as

Fluidized bed boilers can successfully burn coal with ash contents as high as

a. 10%
b. 30%
c. 55%
d. 60%
e. 70%



Answer: E

Large "clinkers" are not produced in fluidized bed furnaces because of:

Large "clinkers" are not produced in fluidized bed furnaces because of:

a. Lower furnace temperatures
b. Fast fluidization air movement
c. The kind of fuel being burned
d. FBC boilers can only burn fuel with low ash fusion temperatures
e. The very high furnace temperatures




Answer: A

In order to get maximum heat transfer in a bubbling bed furnace, it is necessary to:

In order to get maximum heat transfer in a bubbling bed furnace, it is necessary to:

a. Increase the fuel consumption per hour
b. Ensure that the boiler tubes are covered by the expanded bed
c. Line the floor and ceiling of the furnace with steel plates
d. Add fuel gas to the regular fuel being burned
e. Operate the sootblowers more frequently

Answer: B

To effectively remove fine dust from flue gas, the most common method in power plants uses:

To effectively remove fine dust from flue gas, the most common method in power plants uses:

a. Cyclone separators and filter beds
b. Oil wetted fiberglass filters
c. Cyclone separators
d. Dust collectors
e. Electrostatic precipitators and fabric filters



Answer: E

The efficiency of a combined cycle plant, using a pressurized fluidized bed boiler, is about _____ higher than that of a conventional pulverized coal plant.

The efficiency of a combined cycle plant, using a pressurized fluidized bed boiler, is about _____ higher than that of a conventional pulverized coal plant.

a. 25%
b. 20%
c. 15%
d. 10%
e. 5%




Answer: E

In an atmospheric fluidized bed boiler, the combustion air pressure is typically 25 cm of water at the FD fan, 16 cm of water at the base of the active bed and _____ at the top of the combustion mass:

In an atmospheric fluidized bed boiler, the combustion air pressure is typically 25 cm of water at the FD fan, 16 cm of water at the base of the active bed and _____ at the top of the combustion mass:

a. Boiler pressure
b. Negative 16 cm of water
c. Negative pressure
d. Atmospheric pressure
e. Absolute pressure





Answer: D

Due to the comparative size of FBC power plants, a significant saving is gained in:

Due to the comparative size of FBC power plants, a significant saving is gained in:

a. Fuel and waste costs
b. Material and construction costs
c. Heat and light costs
d. "Clinker" and soot blowing costs
e. Fuel storage costs



Answer: B

In fluidized bed combustion, the fuel content (by mass) in the turbulent material is usually:

In fluidized bed combustion, the fuel content (by mass) in the turbulent material is usually:

a. greater than 25%
b. extremely high in sulfur
c. less than 2%
d. 4 to 8%
e. around 10%



Answer: C

The inert bed material of a fluidized bed boiler must be heated to about __________ °C.

The inert bed material of a fluidized bed boiler must be heated to about __________ °C.

a. 350
b. 500
c. 600
d. 750
e. 900


Answer: C