Unlike other products that focus on removing the pollutants from a poorly burning fire, Earth’s Flame addresses the source of the fireplace emission – the poorly burning fire. Earth’s Flame reduces emissions by promoting good combustion in the fireplace. The Earth’s Flame design primarily accomplishes good combustion by improving the time honored 3 T’s of good combustion – Time, Temperature, and Turbulence. Other combustion friendly and pollution reducing features are also incorporated in the design. Here’s how we did it:
Incomplete combustion is a problem in fireplaces that largely contributes to fireplace emission levels. The longer the time combustion gases spend in the higher temperatures of the combustion zone the more completely they will combust and subsequently the lower the emissions will be from the fire. Earth’s Flame has a refractory panel above the fire that makes the flames travel a longer distance before exiting the combustion chamber. This longer path increase the residence time of the gases thus promoting a better overall burn and a reduction in emissions.
A traditional fireplace has very little turbulence in the combustion gases once they leave the burning wood, the flame path is straight up the chimney. There are oxygen starved parts of these gases that have not completely combusted. The temperature of the flame path is also not uniform, very hot in spots and cooler in others. The more turbulence that is encountered in the combustion gas path the better these gases mix with the surrounding oxygen, the more uniform the gas temperature, and the more complete the burn. Earth’s Flame grooved refractory panel above the wood burning zone and the circuitous flame path promotes the necessary turbulence and mixing required for good combustion.
The tubular design allows oxygen rich room air to be induced into the hollow tubes of the grate. The air is preheated as it travels through the tubes under the wood fire, as it rises through vertical tubes, and ultimately exits through holes placed around the refractory panel. The exit point of this air is in direct contact with the split flame path of the combustion gases in an area where turbulence and mixing has been created. When oxygen deficient combustion gases enter this area they find an environment friendly to complete their combustion. Earth’s Flame design in essence creates a secondary combustion zone within a traditional fireplace.
Particulate normally entrained in the combustion gases with mechanically impinge on the refractory panel above the fire and fall out of the gas stream. This occurs while the flame path is making an abrupt turn from its intended path. The particle will drop back into the primary combustion zone and be re-entrained for additional burn time. A particle that would have been an emission in a traditional fireplace is more completely combusted by the Earth’s Flame design.