How it works
Efficient Use of Fuel reduces energy consumption
- Significantly less masonry is heated during firing process.
- The zig-zag partitioned walls are themselves made of green bricks, which when fired, become saleable product.
- Higher fuel combustion means less fuel is consumed, almost entirely eliminating soot (black carbon) and CO2 emissions.
- The directional zig-zag controlled air turbulence, creates higher temperatures, which increases fuel combustion and decreases fuel consumption.
- Heat from fired bricks, is reclaimed from behind the fire zone and propelled forward ahead of the fire, accelerating the drying of green bricks and facilitating faster fire progress.
- Increasing the speed of firing zone, means the kiln requires a smaller footprint, although the footprint is smaller the kiln provides similar production outputs to that of comparable target replacement kilns i.e. the FCBTK or MCBTK.
Efficiency of the Firing Process
- The HZZK offers almost complete fuel combustion.
The fire moves through stationary bricks in a zig-zag fashion creating critical air turbulence allowing for;
- Even heat distribution
- Maximum heat generation
- Maximum energy extraction from fuel source
- The firing process is accelerated through creating air flow and turbulence (draught) through the use of a low horsepower axial fan.
- Control valves and dampers, are used in conjunction with the fan, resulting in increased directional air turbulence and highly efficient fuel combustion (minimal emissions).
Efficient use of generated heat
- Heat is moved ahead of the fire to pre-dry green bricks before full-firing, this allows for more rapid fire progression and increased brick production output.
- Pre-drying is achieved by extraction of heat from fired bricks behind the fire zone, with clean, dry heat.
Cutting CO2 emissions in brick-making
The successful conclusion of the in-depth research study is a significant achievement for the Energy Efficient Clay Brick (EECB) Project, a CBA initiative funded by the Swiss Agency for Development and Cooperation (SDC) and implemented in South Africa by Swisscontact.