Ergun Design Technologyfor Boilers

Pinch Technology

The "Pinch" technology especially adapted to the design of Boilers consist of studying diverse possible limitations of heat exchange procedure and the definition of the most advantageous design case.

As it can be seen on the diagrams presented beside, the heating media (mostly bed suspension and flue gas) cumulative enthalpy is compared to that of heated media (here air, water and steam). These two curves should be as near as possible to optimize the steam generation while a minimum temperature difference (Pinch temperature) is necessary between hot and cold medias to minimize heat exchangers surfaces.

The second diagram shows how the total heat (Bed, ash and flue gas) is divided into smaller portions for diverse uses. In the example beside, the main part of the bed heat (generated by combustionbed) is used to transform water to saturated steam. This is shown by a white circle in the BedWW yellow column connected simultaneously to the circles "Bed W" and "Steam" in the bleu columns. The remaining heat is moved out of the bed by the flue gas (second yellow column) and distributed over diverse heat exchangers in the backpass.

 Visual Approach

As we can see in the above example, the design technology is focused on a visual approche where not only the data is presented as a Text File (see Results section) but also in some explicative and interactive diagrams.

The visual approach is not only a fair way to present results. The major goal of this approach is to create a kind of communication between the user and the program so that the limiting steps, critical points and design procedure in general become clear also for those who are not experts in the "Combustion" and the "Steam Generation" domains.

Ergun Design Technology

Example of enthalpy diagram presented after the analysis of the fuel heating capacity.

Simple heat distribution diagrams helps the user in a better understanding of design limitations.

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