By melisa elkins. fire pits design. Published at Friday, November 10th, 2017 - 10:24:11 AM.
By placing the fire pit away from the flow of traffic and raising the fire pit from the ground you will make it hard for anyone to accidentally walk or fall in. Choose a location for the fire pit that will reduce as much as possible the effect of smoke on neighbouring properties, or even you own or that matter. If this an issue then go with a gas burning fire pit as they do not emit smoke. If children are a factor, incorporate a barrier such as a low wall surrounding the pit that will ensure they are kept a safe distance from the flames. Some portable fire pits are designed with a protective glass or Pyrex shield. This also helps limit the wind’s affect on the flames.
The burning process can be illustrated by an examination of the flame of a candle. The wax does not burn directly, but, rather, gas given off by the heated wax travels up the wick and burns. Prove this by blowing out a candle that has been burning for some time. Then pass a lighted match through the trail of smoke rising from the wick. A flame will travel down the smoke to the wick and relight the candle. There are three areas in the flame produced by fire pits: (1) the dark inner area of no combustion and (2) an intermediate layer of incomplete combustion, composed of hydrogen and carbon monoxide that gradually work their way to (3) the outside cone of complete combustion.
FUEL: Given the right circumstances, most substances will burn or combine with oxygen in combustion, a chemical process that liberates heat. (Remember that fire is the heat and light resulting from combustion.) However, the temperature at which things will burn in fire pits, called the ignition point or kindling point, varies according to the substance. For example, the kindling point of film, nitrocellulose, is only 279 degrees Fahrenheit - not recommended for use in fire pits. For wool it is 401 degrees Fahrenheit - obviously making fire pits hard to light, and for newsprint 446 degrees Fahrenheit - perfect for fire pits. What Fuel should I use in my Fire Pit? Wood or charcoal can be used in most fire pits. Some fire pits run on gas, a great alternative. See Artistic Fire Pits for converting your fire pit to gas.
OXYGEN: Although there are other chemicals that can combine with fuels to produce heat, oxygen is the most common. The need for oxygen to sustain a fire in all fire pits is shown by the fact that fuels heated in a vacuum will not burn. Sorry there will be no outdoor fire pits in space! CHEMICAL REACTION: There are certain conditions under which fuels will not produce a flame, even though fuel, heat and oxygen are present. For example, if the percentage of natural gas in air is not between about 4 percent and 15 percent, no flame will be produced; your fire pit will not go!
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