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CFD modelling

CFD ModellingCFD modelling (Computational Fluid Dynamics) is one of the main methodologies used by RJM to accurately measure and define the combustion process dynamics which take place within coal, oil, gas and biomass-fired boilers and furnaces.

CFD modelling is typically used in conjunction with a physical site survey to provide actual plant performance, so that a baseline model can be established within the CFD model that replicates existing unit performance as its starting point. The site survey also serves to verify baseline process data including NOx, CO, excess oxygen conditions as well as furnace exit gas temperatures and other key parameters.

CFD modellingOnce the baseline conditions have been  established and confirmed as representative of the field data, RJM will run the CFD model to analyse every aspect of the combustion process and to identify what combination of changes, modifications or upgrades might be applicable to deliver the emissions reductions or efficiency improvements required by the plant operators. This is complex and detailed work and RJM continues to invest heavily in refining and developing its own CFD modelling software to ensure greater accuracy and to be able to offer its customers a more detailed analysis of the combustion challenges and a more rigorous set of solutions to address them.

Typically, the difference between the baseline emissions and performance, compared to the proposed modifications to operating procedures and plant upgrades proposed by RJM, determines the performance improvements and emissions reductions that can be achieved. RJM follows a strict and logical iterative procedure until the upgrade performance falls in line with the project objectives. Once this is achieved, RJM will design, manufacture and install any new components that are required, make modifications to existing equipment and work with plant operators to ensure that new operating procedures deliver the results required.

RugeleyAs RJM's CFD modelling is so sophisticated, it enables all modifications to the combustion process to be tested for effectiveness off-line, before any physical hardware is fabricated. In this way, CFD modelling accelerates the design process, as it provides fast and reliable results. It is also used as a tool to shorten downtime, as settings for commissioning can be estimated before the equipment is installed. This often results in major cost savings to our clients.

CFD models are complex programmes and require substantial experience and expertise to give reliable results. RJM uses CFD modelling on all emission reduction projects and in fact, RJM was the first company to modify other manufacturers' burners to change them into low NOx performers.

Our reference list speaks for itself. With over 60,000MWe of installations to our name, encompassing all makes of burner and boiler, with all types of firing configurations deploying every commonly-fired fuel, RJM's modelling capability and historical success is second to none. More.

Visualised CFD data confirms how RJM’s Ultra-Low NOx Burner upgrade delivers greatly reduced levels of NOx and improved combustion characteristics, with the flame now located in the centre of the furnace, away from the furnace walls.