Air burner technology

Technology

Air curtain burners, also known as air curtain incinerators, hearths, trench burners, etc., were primarily designed as a pollution control device for open burning. principle of an air curtain machine is to reduce particulate matter (PM) or smoke resulting from the combustion of clean wood waste. Using a technology called an "air curtain", the smoke particles are trapped and re-burned, reducing them to an acceptable limit under US EPA guidelines.

Clean wood waste is loaded into the FireBox, and an accelerant such as diesel fuel is used to ignite the wood waste, just like you would start a campfire or open fire. The air curtain n 's not activated until the fire grows large, otherwise the air curtain may extinguish the fire. air is activated. The air curtain then operates at a steady state throughout the burn operation, and the wood chips are loaded at a rate consistent with the burn rate. Our smallest machine will burn at a rate of 1 to 2 tons per hour; our largest machine can burn more than 10 tons per hour.

The main purpose of the air curtain is to create a "secondary combustion chamber". The air curtain is like a lid covering the opening of a FireBox. The smoke particles rising on the hot gases from the fire are trapped under the air curtain. These smoke particles are then re-burned and their size is greatly reduced. With this reduced size, they can now escape through the air curtain and look more like waves of heat than smoke. The result is a very clean burn, with opacities well below 10% in EPA Method 9 testing (compared to open burning, which can typically operate at an opacity of 80 to 100%.

The image on the right shows two FireBox S-327 series air burner machines completely full and on fire, while in the background a pile of wood is being burned in the open. The same amount of wood , 20 tonnes, was used at each of the two sites. The FireBoxes disposed of all 20 tonnes of waste wood in one hour. The open pile burned for over 48 hours to process the same amount of waste wood.

The photo on the right is an aerial view of this site. It shows the environmental impact of open burning compared to air curtain burning. To eliminate 20 tons of waste wood, the FireBoxes took an hour, while the open burning took over 48 hours. The open burning filled the valley with black carbon smoke, while the air burners were almost undetectable.

Burning in place eliminates the need for crushers and trucks. Plus, it's much faster, saving money and protecting the environment.

The most concerning carbon black smoke particles are the ones you can't see. They are called PM2.5 and consist of particles with a size less than 2.5 microns. These are the particles that can hurt you. , as they are small enough to break through your body's defenses. No other machine used for wood waste disposal, including grinders and chippers, can control PM2.5 as well as a burner machine. air. Our air curtain works.

For proper operation, the air curtain machine must be designed to provide an air curtain over a fire that has a mass flow and velocity in balance with the potential mass flow and velocity of the burning woodwaste. If the air curtain velocity is too high, the FireBox may become too pressurized and overly agitated. The higher pressure will lift the curtain and render it ineffective. Over-agitation will cause embers and ashes to blow out of the FireBox at the past the inefficient air curtain at a significantly higher rate than normal. If the mass flow rate of the curtain is too low. Unburnt particles (smoke) will enter the curtain due to the high velocity of the hot gases generated by the wood burning. Air Burners machines have been thoroughly tested by some of the world's top environmental agencies, including the US EPA, EA UK, EPA Australia, and many more to prove our ability to control emissions. particulate matter and PM2.5 emissions.