Case Studies:
Mechanical Collectors


An economical method was needed for an ageing coffee site installation, in order to reduce high levels of coffee fines that were exhausting the stack in the final roasting process . The site had a compact assembly, minimal historical data or emissions testing and a simplified solution was needed.
A wet cyclone system was a suitable alternative to the fabric filter, as it could re-agglomerate the roasted coffee fines with water, and direct the slurry back into the process without disruptions. With its slim geometry and available head clearance, it was the optimum technology solution.
The low pressure drop across the cyclone meant no changes had to be made to the draft fan. Emissions out of the stack were significantly reduced with no visible remnants. Minimal moving parts meant minimal maintenance. This assisted in a quicker capital payback return, as the collected agglomerate coffee was re-roasted, packaged and sold, increasing revenue.


The kiln furnace at a waste treatment process facility was producing an excessive range of particulate dust size. It needed to be captured before proceeding through to the balance of the off-gas treatment facility. Finding a suitable material was also integral, due to the kiln’s elevated exhaust temperatures.
With the installation of the multi-cyclone system, both heavy and ultra-fine particulates were able to be collected, improving the particulate carry-over. Due to the elevated temperatures, no moving parts were introduced, which reduced the requirement for excessive maintenance or shutdowns.
Minimal carry over of ultra-fine particulates to the balance of the off-gas system resulted in a reduction of shutdown maintenance works, and a 98 percent cleaning efficiency. Due to the dry off-gas, a suitable hardness of cast iron material was selected for the cyclone units and operation.