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1st Year Low Pressure Boiler > Chapter 5- Fuel Systems > Flashcards

Chapter 5- Fuel Systems Flashcards

1
Q

What is natural gas?

A

Is a colorless and odorless fossil fuel

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2
Q

What is a therm?

A

Is the quantity of gas required to produce 100,00 Btu

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3
Q

Is gas heavier or lighter than air?

A

Gas is lighter than air and dissipates into the atmosphere if released

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4
Q

In a low pressure gas system gas pressures reduced to how much?

A

In a low pressure gas system gas pressure reducer from supplier gas pressure to approximately 0 pounds per square inch psi at the burner

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5
Q

What are fuel system accessories used for?

A

Fuel system accessories are used to store, supply, and control the fuel supplied to a boiler

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6
Q

What is a Venturi?

A

Is the narrative portion of a tube

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7
Q

Are gas burners high-pressure or low-pressure?

A

Gas burners can be high pressure gas burners or low pressure gas burners

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8
Q

What is a high-pressure gas burner?

A

In the high pressure gas burner gas is supplied and mix with air inside the burner

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9
Q

What is a low pressure gas burner?

A

In a low pressure gas burner, air passing through a mixing chamber outside the burner draws gas from the zero pressure gas chamber. Airflow speed increases as the air passes through the small orifice into the pressure conversion chamber

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10
Q

What does the heat content of natural gas varies

A

The heat content of natural gas varies from 950 BTU to 1050 BTU per cubic foot

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11
Q

What is fuel oil?

A

Is a liquid fossil fuel that consist primarily of carbon hydrogen and moisture

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12
Q

What is ultimate analysis?

A

Ultimate analysis is a chemical process used to measure quantities of elements that compose a substance

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13
Q

What are the fuel oil characteristics?

A

The fuel oil characteristics include viscosity, poor point, flashpoint, fire point, Volatility and heating value

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14
Q

What is viscosity?

A

Is the internal resistance of a fluid to flow

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15
Q

What is pour point?

A

Is the lowest temperature at which fuel oil flows as a liquid

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16
Q

What is flashpoint?

A

Is the temperature at which fuel oil emits vapor that flashes when exposed to an open flame

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17
Q

What is fire point?

A

Is the temperature to which a fuel oil must be heated to burn continuously when exposed to an open flame

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18
Q

What is Volatility?

A

Is the ability of the fuel to be vaporized

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19
Q

What is Viscosity Limits?

A

They are the specification of viscosity measurements requieres to properly transport and atomize the fuel

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20
Q

What is Atomization?

A

Is the process of reducing fuel oil into a fine spray of minute particles

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21
Q

What is Heating Value?

A

Is the amount of energy in a fuel, Btu per pound, therm, or a gallon of fuel

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22
Q

What is Btu?

A

Amount of heat needed to raise 1lb of water by 1 degree f

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23
Q

What is a Distillate fuel oil?

A

Is a fuel pile that has low viscosity and includes No. 1 fuel oil and No. 2 fuel oil

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24
Q

What is a Heavy (residual) fuel oil?

A

A fuel oil that has a high viscosity and includes No.4 fuel oil, No.5 fuel oil, and No.6 fuel oil.

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25
Q

What is API gravity?

A

Is the scale commonly used by the petroleum industry for indicating specific gravity of fuel oil

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26
Q

What is Specific Gravity?

A

The ratio of the weight of a given volume of a substance to the weight of the same volume of water at a standard temperature of 60 f

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27
Q

What do Fuel oil accessories do?

A

Clean, control the temperature, and regulate the pressure of fuel oil

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28
Q

What is a fuel oil strainer?

A

Is a fuel oil accessory that removes foreign matter from a fuel oil system

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29
Q

What is a fuel oil pump?

A

Is a fuel oil accessory that produces the pressure required to draw fuel oil from the fuel oil tank and deliver it to the burner at a controlled pressure

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30
Q

What is a fuel oil controller?

A

A group of fuel oil accessories used to prepare fuel oil for burning in the burner

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31
Q

What is a fuel oil pressure regulator?

A

A burner accessory that controls the amount of fuel oil pressure at the modulating cam

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32
Q

What is a Modulating cam?

A

A mechanical device used to regulate the flow of fuel oil to the burner for controlling the firing rate

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33
Q

What is the main fuel oil solenoid valve?

A

A burner accessory that opens when energized by contacts in the programmer to allow fuel oil to flow the burner nozzle

34
Q

What is a “Y” fuel oil strainer?

A

A fuel oil strainer with a cylindrical mesh screen in a cast iron body similar to a steam strainer

35
Q

What is a basket fuel oil strainer?

A

A fuel oil strainer with one basket and a basket housing

36
Q

What is a duplex fuel oil strainer?

A

A fuel oil strainer with two baskets and basket housings

37
Q

Are Fuel oil pumps direct drive or belt drive?

A

Either or

38
Q

What is an Internal gear pump?

A

is a pump that consist of a small drive gear mounted inside a large internal ring gear

39
Q

Where is the relief valve located?

A

Between the fuel oil pump and the discharge valve

40
Q

What is a fuel oil burner?

A

A burner component that provides atomized fuel oil to the burner

41
Q

What is an atomizing burner?

A

A fuel oil burner that uses air, steam, or fuel oil pressure to atomize fuel oil for maximum combustion efficiency

42
Q

What is a rotary cup burner?

A

Is a fuel oil burner that atomized fuel oil by discharging fuel oil off the outer surface of a spinning cup with high velocity air

43
Q

What is purging the fuel oil?

A

The process of using air to discharge residual fuel oil in the burner nozzle

44
Q

What is a burner gun?

A

Is the fuel oil mount and nozzle assembly that is inserted in the furnace

45
Q

What is a combination burner?

A

If your system that can use natural gas or fuel oil

46
Q

What is a combustion control?

A

A control that regulates fuel supply, air supply, air to fuel ratio and removal of gases of combustion in the boiler

47
Q

What does combustion controls regulate?

A

The amount and frequency of firing in the burner to maintain the required pressure in the boiler for maximum efficiency

48
Q

What is firing rate?

A

Is the amount of fuel the burner is capable of burning in a given unit of time

49
Q

What is air proving switch?

A

Is an air pressure-actuated switch that closes after proving sufficient pressure of combustion air from the forced draft fan

50
Q

What is the most common combustion control system on low pressure boilers?

A

The most common combustion control system is the ON/OFF Control System

51
Q

What is Perfect Combustion?

A

Perfect Combustion is when all the fuel is burned using only the theoretical amount of air

52
Q

What is Complete combustion?

A

Complete Combustion is combustion that occurs when all the fuel is burned with a minimum amount of excess air remaining

53
Q

What is a incomplete combustion?

A

Combustion that occurs when all the fuel is not burned

54
Q

What is an ON/OFF control system?

A

Is a combustion control system that starts and stops the burner to control the amount of steam provided

55
Q

What controls a burner firing frequency?

A

By a pressure control

56
Q

What is primary air controls?

A

The amount of fuel oil capable of being burned

57
Q

What is secondary air controls?

A

The combustion efficiency and is usually introduced into the friend is from below the burner

58
Q

What is a modulating control system?

A

Is a combustion control system that controls the mound Steen produced by changing the burner firing rate

59
Q

What is a modulating control set to do?

A

A modulating control is set to control low fire and high fire ranges

60
Q

What is the turn down ratio?

A

A modulating burner is the ratio of the maximum firing rate of the burner to the minimum firing rate

61
Q

What is flashback?

A

Is the condition where a flame travels up went and into the burner assembly

62
Q

What is a flame safegaurd system?

A

Is burner control equipment that monitors the burner start-up sequence and the main flame durning normal operation

63
Q

What is a programmer?

A

Is a control that functions as the mastermind of the burner control system to control the firing cycle

64
Q

What is the set order sequences for a flame safeguard programmer?

A

Prepurge,

ignition trials,

pilot flame-establishing period,

main burner flame-establishing period,

run period,

post purge

65
Q

What is pre-purge?

A

Is the period of time after start up (call for heat) during which the burner motor(blower) runs to change the air in the furnace

66
Q

What is an ignition trials?

A

Is the period of time during which the pilot and main burner must be ignited

67
Q

What is the pilot flame establishing period?

A

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

68
Q

What is the main burner flame-establishing period?

A

Is the period during which the programmer permits the main fuel valves to be open and the flame detector is required to detect the main burner flame

69
Q

What is the run period?

A

Is the period after the ignition trials and before the operating set point is reached during which the main burner is firing

70
Q

What is post purge?

A

Is the period of time after the run period during which the gas valves are shut off and the burner motor (blower) continues to run, discharging all unburned fuel and products of combustion from the furnace

71
Q

What is combustion efficiency?

A

A measure of how efficiently a boilers burns fuel without considering any losses

72
Q

What is a Direct Digital Control (DDC) system?

A

A solid-state control system in which a building automation systems controller is wired directly to control devices

73
Q

What are the types of flame scanners/sensors ?

A

A Flame sensor, flame rod sensor, photocell sensor, ultraviolet sensor, infrared sensor, and lead sulfide cell

74
Q

What is a Flame Scanner?

A

A safety device that senses if the pilot light and /or main flame are lit

75
Q

What is a flame failure?

A

A boiler condition that occurs when the flame in the boiler furnace has been unintentionally lost

76
Q

What is a Flame sensor?

A

Is the sensing device in a flame scanner used to sense the pilot and main flame in the burner

77
Q

What is a Flame rod sensor?

A

A flame sensor that uses the ability of a small amount of electrical current to be conducted by and through a flame

78
Q

What is a photocell sensor?

A

A flame sensor that senses visible light from the burner

79
Q

What is an ultraviolet sensor?

A

A flame sensor that senses light frequencies that are higher than those visible to the eye

80
Q

What is an Infrared sensor?

A

A flame sensor that senses light frequencies that are lower than those visible to the eye

81
Q

What is a lead sulfide cell?

A

A flame scanner sensing device that contains lead sulfide used to detect infrared light

1st Year Low Pressure Boiler (11 decks)

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