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Chapter 10
Draft Systems
| Question | Answer |
|---|---|
| Draft is measured in ? a. pounds per square inch b. inches of water column c. tenths of an inch of mercury d. ounces per square inch | b. inches of water column |
| ? draft is created by a draft fan that pulls the gases of combustion through the furnace a. forced b. natural c. induced d. chimney | c. induced |
| Pressure at the discharge side of a forced draft fan is ? atmospheric pressure a. balanced at b. less than c. the same as d. greater than | d. greater than |
| ? compounds are classified as a pollutant because they react with water vapor to form sulfuric acid a. carbon b. ozone c. nitrogen d. sulfur | d. sulfur |
| An air heater employs a counterflow principle in which the gases of combustion ? a. and air move in opposite directions b. and air move in the same direction c. bypass the flowmeter d. and air mix together | a. and air move in opposite directions |
| If the temperature of air entering the heater get to low, it will cause ? a. condensation on the gas side of the air heater b. thermal shock to the heater c. incomplete combustion d. oxygen pitting | a. condensation on the gas side of the air heater |
| Air heaters can be cleaned by ? to ensure good heat transfer a. wire brushing monthly b. reversing air and gas flow c. using soot blowers d. using high pressure water on the gas side | c. using soot blowers |
| Air heaters can most successfully be used in plants that ? a. have a fluctuating steam load b. have a a fairly constant steam load c. have high chimneys d. burn only coal or fuel oil | b. have a fairly constant steam load |
| If air supplied for combustion mixes with the gases of combustion, it could lead to ? a. a loss of air for combustion and incomplete combustion b. an increase in chimney temperature c. an increase in excess oxygen d. higher boiler efficiency | a. a loss of air for combustion and incomplete combustion |
| Mechanical draft is produced by ? a. the height of the chimney b. the diameter of the chimney c. power driven fans d. steam jets | c. power driven fans |
| Mechanical draft can be classified as ? a. pressurized b. natural c. regenerative d. forced or induced | d. forced or induced |
| The ? is a law that was passed to allow for monitoring and controlling environmental air pollution a. ozone emissions act (OEA) b. particulate matter plan (PMP) c. new source performance standard (NSPS) d. clean air act (CAA) | d. clean air act (CAA) |
| The gases of combustion leaving a boiler that has as natural draft are controlled by ? a. dampers b. adding excess oxygen c. higher firing rates d. induced draft fan | a. dampers |
| The induced draft fan is located ? a. between the boiler and the chimney b. inside the air preheater c. at the burner d. in the first pass of the gases of combustion | a. between the boiler and the chimney |
| Mechanical draft is used when burning ? a. fuel oil b. coal c. gas d. all of the above | d. all of the above |
| Larger steam boilers that are equipped with air heaters or economizers typically use ? to overcome the associated flow resistance a. natural draft only b. balanced draft c. air heater diverters d. counterflow economizers | b. balanced draft |
| When using forced draft, the amount of draft is controlled by ? a. inlet dampers b. outlet dampers c. variable speed fans d. all of the above | d. all of the above |
| A ? draft system is used to overcome air and gas flow resistance a. secondary b. primary c. forced d. balanced | d. balanced |
| The oldest form of draft used in a boiler is ? draft a. mechanical b. natural c. forced d. combination | b. natural |
| Solid particles created in the combustion process are called ? a. gases of combustion b. pulverized coal c. induced carbon d. flyash | d. flyash |
| A ? can be used as part of a damper control system to adjust the speed of a fan a. variable speed drive b. damper linkage c. modulating motor d. jackshaft | a. variable speed drive |
| ? is the method of choice for removing sulfur oxides from emissions from coal fired plants a. flue gas re circulation b. a baghouse c. scrubbing d. electrostatic precipitator | c. scrubbing |
| The amount of draft produced in a natural draft system depends on the ? a. diameter of the chimney b. height of the chimney c. amount of flyash in the gases of combustion d. types of fans used | b. height of the chimney |
| Boilers can be equipped with ? to reduce the heat loss from the gases of combustion going to the chimney a. open feedwater heaters b. superheaters c. economizers and air heaters d. baffles in uptakes | c. economizers and air heaters |
| ? is produced from incomplete combustion due to poor burner design or firing conditions a. carbon monoxide b. nox c. sulfur d. mercury | a. carbon monoxide |
Created by:
zmos89