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Air flow balancing

 In many instances after RJM has completed a site survey, a follow-on recommendation is to carry out an Air Flow Balancing survey, also known as an Air Distribution Analysis (ADA) survey. This type of survey provides additional information about how air moves around the furnace and in turn, enables RJM to suggest impovements to further optimise overall combustion. Unsatisfied with the quality of data provided by off-the-shelf components, RJM developed its own air flow balancing analysis tool which is fast, accurate, repeatable and highly cost-effective.

Using a hot wire anemometer, measurements were taken at 24 points around the circumference of each burner throat.

RJM Data collection

The image above shows air flow balancing data being collected at a power plant on Sicily, using RJM's in-house developed software. More.

It allows for several different 2D & 3D graphical charts to be created, allowing for a clear, visual understanding of air flow distribution within the furnace. Some examples of the visual generated can be sen in the right hand column. Analysing data in this way also means valid comparisons can be made between different burners on the same generation unit.

Air flow balancing diagram

RJM's ADA tool measures actual airflow at the critical fuel-air mixing interface in each burner. The tool records data sets from over 2,400 readings per burner.

This in turn means that RJM's airflow balancing technology provides the most detailed profile of each burner's performance, whether oil, gas, coal or bio-fuel fired.

RJM's results are delivered in both numeric and 3-D graphic formats. Taken together, they give the most comprehensive picture to help define the extent of perimeter loading problems and other airflow imbalance issues.

caption: Typical results, pre and post ADA. The pre-test data is in green highlighting as high as 70% deviation in airflow between burners. The post in red shows the target of +/-5% deviation of flow between all burners.From this data, RJM will determine the need for windbox airflow baffles and turning vanes. This ensures good mass flow distribution between burners, peripheral distribution within each burner and destruction of any vortex flows, which may otherwise result in air starvation at critical air-fuel mixing zones within the flame envelope.