Chemical simulation in dwsim for Lng one-through steam boiler

[jiwon111121]

'm currently preparing to simulate a steam boiler process that produces around 2 to 4 tons of steam per hour.
As I include an air preheater and a feedwater preheating heat exchanger in the simulation, I keep encountering a circulation error.

Let me know if you'd like a more formal or technical tone depending on the audience (e.g., engineering forum vs. casual group chat).

https://www.youtube.com/watch?v=0gdRg7SBai4

I watch above video and study but there is no steam generating block.
So I added H/X between Conversion Reactor and economizer.
But it doesn't work cause of infinite loop problem.

##Below is error message

Infinite loop detected while obtaining flowsheet object calculation order. Please insert recycle blocks where needed.

System.Exception: Infinite loop detected while obtaining flowsheet object calculation order. Please insert recycle blocks where needed.

at DWSIM.FlowsheetSolver.FlowsheetSolver.GetSolvingList(Object fobj, Boolean frompgrid) in C:\Users\danie\source\repos\DanWBR\dwsim\DWSIM.FlowsheetSolver\FlowsheetSolver.vb:line 1085

at DWSIM.FlowsheetSolver.FlowsheetSolver.SolveFlowsheet(Object fobj, Int32 mode, CancellationTokenSource ts, Boolean frompgrid, Boolean Adjusting, Action FinishSuccess, Action FinishWithErrors, Action FinishAny, Boolean ChangeCalcOrder) in C:\Users\danie\source\repos\DanWBR\dwsim\DWSIM.FlowsheetSolver\FlowsheetSolver.vb:line 1206

[DanWBR]

@jiwon111121 you need to add a recycle block to the closed loop section of your flowsheet.

[jiwon111121]

I added recycle block from air preheater outlet air to air linked to conversion reactor.
But dwsim sent error message about infinite loop.