Extras Flashcards
_______coal is a coal that is ground into a fine powder
Pulverized
_______coal is a hard coal with a high luster that yields a small amount of volatile matter when is burned
Anthracite
_______coal is a soft coal that yields a large amount of volatile when is burns
Bituminous
The_____is the full lengh of a coal stoker
Retort
A______draft fan is a fan located before the furnace that supplies the necessary air and air flow for the combustion proces
Forced
______is the burning of fuel on a grate at a rate that only sustain the ignition
Banking
The______is the location in a coal stoker where the coal is burned
Moving grate zone
The_____is the location in a coal stoker where any remaining coal is burned before discharging to the ash pit
Dumping grate zone
A_______control is a control that regulates fuel supply, air supply, air-to-fuel ratio and removal of gases of combustion in a boiler
Combustion control
_______is the amount of fuel the burner is capable of burning in a giving unit of time
Firing rate
An______is an air pressure-actuated switch that closes after proving sufficient pressure of combustion air from the forced draft
Air proving switch
_____is the condition where a flame teavels upwind and into the burner assambly
Flashback
A______is a control that functions as the mastermind of the burner control system to control the firing cycle
Programmer
_____is the period of time after startup
Prepurge
_______is the period of time during which the pilot and main burner must be ignited
Ignition trials
The pilot_______period is the period during which the programmer permits the pilot valve to be open and the flame detector is required to detect the pilot flame
Flame-establishing
A______is a safety device that senses if the pilot light and/or main flame are lit
Flame scanner
A_____is the sensing device in a flame scanner used to sense the pilot and main flame in the burner
Flame sensor
A_____is a flame sensor that senses visible light from the burner
Photocell sensor
_________is a flame sensor that senses light frequencies that are higher than those to the eye
Ultraviolet sensor
An______is a flame sensor that senses light frequencies that are lower than those visible to the eye
Infrared sensor
______ _____is the ability of a burner to burn fuel as indicated by the amount of unburned fuel and excess air in the gases of combustion
Combustion efficiency
