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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
What is API gravity?
Is the scale commonly used by the petroleum industry for indicating specific gravity of fuel oil
26
What is Specific Gravity?
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
27
What do Fuel oil accessories do?
Clean, control the temperature, and regulate the pressure of fuel oil
28
What is a fuel oil strainer?
Is a fuel oil accessory that removes foreign matter from a fuel oil system
29
What is a fuel oil pump?
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
30
What is a fuel oil controller?
A group of fuel oil accessories used to prepare fuel oil for burning in the burner
31
What is a fuel oil pressure regulator?
A burner accessory that controls the amount of fuel oil pressure at the modulating cam
32
What is a Modulating cam?
A mechanical device used to regulate the flow of fuel oil to the burner for controlling the firing rate
33
What is the main fuel oil solenoid valve?
A burner accessory that opens when energized by contacts in the programmer to allow fuel oil to flow the burner nozzle
34
What is a “Y” fuel oil strainer?
A fuel oil strainer with a cylindrical mesh screen in a cast iron body similar to a steam strainer
35
What is a basket fuel oil strainer?
A fuel oil strainer with one basket and a basket housing
36
What is a duplex fuel oil strainer?
A fuel oil strainer with two baskets and basket housings
37
Are Fuel oil pumps direct drive or belt drive?
Either or
38
What is an Internal gear pump?
is a pump that consist of a small drive gear mounted inside a large internal ring gear
39
Where is the relief valve located?
Between the fuel oil pump and the discharge valve
40
What is a fuel oil burner?
A burner component that provides atomized fuel oil to the burner
41
What is an atomizing burner?
A fuel oil burner that uses air, steam, or fuel oil pressure to atomize fuel oil for maximum combustion efficiency
42
What is a rotary cup burner?
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
What is purging the fuel oil?
The process of using air to discharge residual fuel oil in the burner nozzle
44
What is a burner gun?
Is the fuel oil mount and nozzle assembly that is inserted in the furnace
45
What is a combination burner?
If your system that can use natural gas or fuel oil
46
What is a combustion control?
A control that regulates fuel supply, air supply, air to fuel ratio and removal of gases of combustion in the boiler
47
What does combustion controls regulate?
The amount and frequency of firing in the burner to maintain the required pressure in the boiler for maximum efficiency
48
What is firing rate?
Is the amount of fuel the burner is capable of burning in a given unit of time
49
What is air proving switch?
Is an air pressure-actuated switch that closes after proving sufficient pressure of combustion air from the forced draft fan
50
What is the most common combustion control system on low pressure boilers?
The most common combustion control system is the ON/OFF Control System
51
What is Perfect Combustion?
Perfect Combustion is when all the fuel is burned using only the theoretical amount of air
52
What is Complete combustion?
Complete Combustion is combustion that occurs when all the fuel is burned with a minimum amount of excess air remaining
53
What is a incomplete combustion?
Combustion that occurs when all the fuel is not burned
54
What is an ON/OFF control system?
Is a combustion control system that starts and stops the burner to control the amount of steam provided
55
What controls a burner firing frequency?
By a pressure control
56
What is primary air controls?
The amount of fuel oil capable of being burned
57
What is secondary air controls?
The combustion efficiency and is usually introduced into the friend is from below the burner
58
What is a modulating control system?
Is a combustion control system that controls the mound Steen produced by changing the burner firing rate
59
What is a modulating control set to do?
A modulating control is set to control low fire and high fire ranges
60
What is the turn down ratio?
A modulating burner is the ratio of the maximum firing rate of the burner to the minimum firing rate
61
What is flashback?
Is the condition where a flame travels up went and into the burner assembly
62
What is a flame safegaurd system?
Is burner control equipment that monitors the burner start-up sequence and the main flame durning normal operation
63
What is a programmer?
Is a control that functions as the mastermind of the burner control system to control the firing cycle
64
What is the set order sequences for a flame safeguard programmer?
Prepurge, ignition trials, pilot flame-establishing period, main burner flame-establishing period, run period, post purge
65
What is pre-purge?
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
What is an ignition trials?
Is the period of time during which the pilot and main burner must be ignited
67
What is the pilot flame establishing 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
68
What is the main burner flame-establishing period?
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
What is the run period?
Is the period after the ignition trials and before the operating set point is reached during which the main burner is firing
70
What is post purge?
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
What is combustion efficiency?
A measure of how efficiently a boilers burns fuel without considering any losses
72
What is a Direct Digital Control (DDC) system?
A solid-state control system in which a building automation systems controller is wired directly to control devices
73
What are the types of flame scanners/sensors ?
A Flame sensor, flame rod sensor, photocell sensor, ultraviolet sensor, infrared sensor, and lead sulfide cell
74
What is a Flame Scanner?
A safety device that senses if the pilot light and /or main flame are lit
75
What is a flame failure?
A boiler condition that occurs when the flame in the boiler furnace has been unintentionally lost
76
What is a Flame sensor?
Is the sensing device in a flame scanner used to sense the pilot and main flame in the burner
77
What is a Flame rod sensor?
A flame sensor that uses the ability of a small amount of electrical current to be conducted by and through a flame
78
What is a photocell sensor?
A flame sensor that senses visible light from the burner
79
What is an ultraviolet sensor?
A flame sensor that senses light frequencies that are higher than those visible to the eye
80
What is an Infrared sensor?
A flame sensor that senses light frequencies that are lower than those visible to the eye
81
What is a lead sulfide cell?
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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