Bunsen burner, device
for combining a flammable gas with controlled amounts of air before ignition
; it produces a hotter flame than would be possible using the ambient air and gas alone.
What is the function of burner?
A burner is a device designed to
ensure that the flame is stabilized by establishing a suitable flow field to produce the initial temperature rise
. The flame is used as the source of heat to preheat the fuel/air mixture to the ignition temperature.
What happens in a Bunsen burner?
The Bunsen burner uses
the combustion of methane (also called natural gas) and oxygen
according to Equation 1 to produce heat. … Mixing air with the gas before combustion ensures that enough oxygen will be available and complete combustion will occur.
Why do gas furnace efficiencies jump from 80% to 90%?
80% furnaces use type B vent and 90% furnaces use PVC pipe for venting material. … Why do gas furnace efficiencies jump from 80% to 90%?
Efficiencies over 80% cause condensation but the flue gas is still too hot for PVC vent pipe until the efficiency reaches
90%.
What is a blue flame called?
The LPG (propane)
is a blue flame because complete combustion creates enough energy to excite and ionize the gas molecules in the flame.
What part of the flame is the hottest Bunsen burner?
The hottest part of the Bunsen flame, which is found
just above the tip of the primary flame
, reaches about 1,500 °C (2,700 °F). With too little air, the gas mixture will not burn completely and will form tiny carbon particles that are heated to glowing, making the flame luminous.
How will you prevent a burner from striking back?
Tie back your hair and take off scarves
in order to prevent them from catching fire by mistake. Close the gas supply immediately when the flame strikes back because of excess air supply. If the gas burner is not used for some time, set it to luminous flame and reduce the gas flow.
Why are blue flames hotter?
Blue flames have more oxygen and get hotter
because gases burn hotter than organic materials
, such as wood. When natural gas is ignited in a stove burner, the gases quickly burn at a very high temperature, yielding mainly blue flames.
Are 80 furnaces being phased out?
This is a big change coming in residential & light-commercial furnaces. Effective June 1, 2013, federal law requires that minimum furnace efficiency in the Northwest must be 90%. That means that
80 percent furnaces cannot be installed after that date
.
How does a 90 efficient furnace work?
Types of Gas Furnaces
Condensing Gas Furnace: A high-efficiency furnace (90% AFUE or higher)
utilizes a second heat exchanger to heat the air from condensed exhaust gases in
order to reach higher efficiencies. A high-efficiency condensing furnace requires specialized venting.
What is the difference between 80 and 90 furnace?
With an 80% furnace, the
lost 20% of heat energy
is exhausted through the furnace’s vent to the outside. A 90% furnace has a secondary heat exchanger to recover these lost gases which then diverts the gases into a condensing phase. This process retains more heat and lowers your energy bills.
What burns a blue flame?
For example,
copper
produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame. This picture illustrates the distinctive colors produced by burning particular elements.
Is blue the hottest flame color?
While blue represents cooler colors to most, it is the opposite in fires, meaning
they are the hottest flames
. When all flame colors combine, the color is white-blue which is the hottest. Most fires are the result of a chemical reaction between a fuel and oxygen called combustion.
What is the hottest flame on earth?
The hottest fires are from oxyacetylene torches (about 3000 degrees Centigrade) that combine oxygen and gas to create
pinpoint blue flames
. Color also tells us about the temperature of a candle flame. The inner core of the candle flame is light blue, with a temperature of around 1800 K (1500 °C).
What part of the flame is the coolest Why?
Actually, the hottest part of the candle flame is the blue part, at 2552 degrees F (1400 C.) That is where the flame has the most oxygen and you are getting complete combustion.
The reddish part
is the coolest part, about 1472 F (800C).
Which part of the flame is the coolest of all?
Where is the coolest part of the flame? The hottest part of the flame is at the tip of the outer blue cone (up to 1200°C). The coolest part of the flame is
inside the inner blue cone
, where combustion is incomplete.
