purging system of fired furncae

    • bwadoud31

      Hi all,
      I am trying to simulate an existing ejector used to purge an fired furnace, but the issue is how we must define the boundary conditions. I tried the boundary conditions below: Reference pressure: 1 atm
      Inlet of ejector: static pressure 7 bar and velocity 48 m/s
      In the bottom of the furnace I tried 2 options:
      1 inlet of furnace with a static pressure 0 atm
      2 as opening with a static pressure 0atm
      Out of the furnace I tried 2 options: 
      1 outlet of furnace with a static pressure 0 atm
      2 as opening with a static pressure 0atm
      The simulation did not converge.
      NB: the geometry and the conditions is like the site (real case).
      I need your help and your advice; after trying a lot of different setups, it seems that I need some help with the boundary conditions of my problem. I'm looking for a stable (steady state?) solution
      I am using ANSYS CFX 14.5.
      thanks, I am very grateful

    • Rob
      Ansys Employee

      Please can you post images in line: as staff we can't open attachments. Is the flow compressible? 

      Also, check the mesh and update to the current version. 

    • bwadoud31

      Hi dear rwoolhoo, how can I chek the mesh.

      thank you for the advice, about the choice of  boundary conditions, I try this simulation to know the mass flow rate of air at the bottom in the furnace, I used the knonw boundary conditions wich are:

      1 the speed, mass flow rate and the pressure at the inlet of the ejector.
      2 at the bottom of the furmace (atmospheric openning), we have only the atmospheric pressur, normaly is the inlet of atmospheric air.
      3 at th top (duct) of furnace is the same (atmospheric openning), normaly is the exit (out).

      at the end of this simulation we must confirm the mass flow rate at the bottom; 

    • bwadoud31

      hi all,

      any help

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