Why P1 U1 V1=0?

hello everyone
What’s wrong with the boundary conditions?

TTFmfx.f90 (28.8 KB)
usr_rates.f90 (4.1 KB)
precalciner.stl (119.0 KB)

Does it run without chemical reactions?

Thanks for your reply@jeff.dietiker, it can run without adding reaction, but the result of running is still P1=0 U1=0 V1=0

The residuals are zero because you start with no solids and it looks like your inlet BCs are not setup properly. Verify the mesh and region locations.