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Oil Fired Steam Boiler

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Efficient and reliable oil-fired steam boilers and thermal oil heaters by Isotex Global. Discover advanced MACH-CFD…

MACH CFD TUBE TECHNOLOGY: Technology licenced proprietary tube systems. MACH-CFD advanced tube technology increases heat transfer and reduces fouling significantly in our boiler and heat exchanger applications.

Hot flue gases enter boiler tube in turbulent pattern but quickly change to a laminar, or straight, flow , Hot flue gases enter boiler tube in turbulent pattern and remain turbulent

Precisely designed ribs keep hot flue gases in turbulent flow throughout the tube profile. Boundary layer forms along tube walls, retarding heat transfer.

In a firetube boiler, the hot flue gases travel through the boiler tubes and transfer heat to the water though the surface of the tube. The greatest heat transfer occurs when the hottest gases come in contact with the surface of the tube for the greatest amount of time.

In a traditional bare tube used in the majority of boiler designs, the hot combustion gases enter the tubes in a turbulent flow pattern. This initial turbulent pattern produces good heat transfer initially, but the hot flue gas pattern quickly changes to a laminar flow, or a straight parallel flow of gases. With the gases traveling in this straight pattern, a boundary layer forms along the tube walls, increasing with the distance of the tube. This layer serves as a barrier, retarding heat transfer. As a result, a bare tube only utilizes a fraction of its diameter for heat transfer, which equates to a lot of wasted space.

Because 30% to 40% of the boiler’s heat transfer takes place in the tubes, it is important to generate as much heat transfer as possible within the tubes. Knowing that the laminar flow of the flue gases causes poor heat transfer, as described above, over the past 10+ years engineers have been looking at ways to create turbulence of the flue gases throughout the length of the tube to increase heat transfer and decrease the formation of boundary layers.

 

 

https://isotexglobal.com/technology/mach-cfd-tube-technology.html



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