A particular application of the once-through boiler design is the steam-flooding boiler. This is a boiler used for flooding oil wells with steam in order to increase the oil recovery.
a. True
b. False
b. True
Steam injection is a procedure for increasing the recovery of oil from wells, which have been _______ depleted.
C. partially
The reason for the use of steam is to allow the maximum quantity of heat to be put into the well with the ________ quantity of injected fluid.
C. minimum
In order to keep the salts in the boiler water dissolved, and to avoid deposits on the tubes, the steam produced contains _____ moisture.
D. 20%
Outputs from Steam Flooding Boilers range from ___ million kJ/h to ___ million kJ/h in standard sizes.
D. 5 , 50
One method of burning _____ is called fluidized bed combustion.
A. coal
Crushed coal from 1.6 mm to 6 mm is injected into the bed by means of an ________.
B. air-stream
Nitrogen oxides (NOx) are emissions which are formed at ____ temperatures.
(D) High
Fluidized bed boilers have the ability to burn ________ fuels in an environmentally acceptable manner.
A. low grade
Combustion can take place at temperatures ranging from ____°C to ____°C instead of normal combustion temperatures of 1600°C to 1900°C for pulverized coal and oil firing.
B. 800 , 900
Because of the low operating temperatures, an inexpensive material such as CaCO3 (lime) can be added to the bed. It acts as a absorbent to remove _____ from the flue gases.
A. SO2
Bubbling Fluid Bed Boilers (BFB) are subject to _____ erosion rates.
B. high
The concept of using waste energy to generate steam has been gaining in popularity. This is mainly because of ______ fuel costs.
C. higher
A simple combined cycle power generation system can consist of:
E. all of the above
The main application for ______ boilers is steam generation using gas turbine exhaust gas as a heat source.
B. HRSG
The main application for ______ boilers is steam generation using gas turbine exhaust gas as a heat source.
C. HRSG
Weak black liquor contains ____ to ____ concentration of solids.
(D) 13 to 17%
Combustion air is usually supplied at primary, secondary, and tertiary levels in a ____.
(D) Recovery Boiler Furnace
The liquor droplets must be ______ enough to minimize entrainment in the combustion gases.
A. large
Combustion air is fed at three elevations of the furnace: primary, secondary, and ________.
A. tertiary
The primary function of the recovery boiler is to process ______ liquor.
A. black
List the five functions of the auxiliary fuel burners:
1. Raise steam during startup
2. Sustain a stable ignition while establishing a char bed
3. Stabilize conditions during upsets in the black liquor feed
4. Produce extra steam as required by the process of for power production
5. Burn out the char bed when shutting down
6. Maintain furnace temperatures
D. 1, 2, 3, 4, 5
If water contacts molten smelt, a violent explosion will result. It is not a _______ reaction but a _________ reaction.
A. chemical, physical
If the black liquor is too ______, it too can result in an explosion.
C. weak
There are two main techniques of burning refuse mass burning and separated, classified, and sorted in various ways to separate out recyclable products.
(a) True
(b) False
(a) True
Heat recovery started to be added to the refuse incinerators, as did strict air pollution guidelines. The basic incinerators with waste heat recovery have evolved into _________ boilers with integral stokers.
D. water-wall
The combustion products from burning municipal waste are very ________.
A. corrosive
There is also corrosion caused by _________ in refuse-fired boilers.
B. chlorides
The higher the tube metal temperature, the ________ the degree of tube metal loss.
D. greater
Corrosion of the ______ furnace area of the boiler can be severe during refuse firing.
C. lower
Inconel™ is an alloy composed mostly of ______ and chromium.
C. nickel
Biomass is anything that is or recently was alive, such as leaves, grasses, bamboo, vine clippings, sugar cane, coffee grounds, and rice hulls.
a. True
b. False
a. True
Systems to burn wood and biomass usually involve a separate ________, called a dutch oven, or a traveling grate or vibrating grate arrangement.
D. furnace
The pinhole grates have __________ air holes to admit air to the burning material on the grate.
A. venture-type
The vibrating grate systems, have grate bars attached to a frame that _______ to remove the ash.
A. vibrate
The vibration also serves to aid combustion by _______ out the bed of burning biomass.
