code_saturne User's Forum

Hi,
    According to the latest CS 2.0rc2, pulverized coal combustion has two options. 
icp3pl is for modeling coal particles as Eulerien phase? 
icpl3c is for modeling coal particles as Lagrangien?
 
which one is better for coal burning modeling?
 
I am from cement industry with coal as fuel burning for making cement clinker. There are two kind combustion styles. In rotary kiln, the coal with high speed injection into kiln as big horizontal torch; the second one, in the calciner (a big duct flow drafted by fan), the pulverized coal and raw meal (limestone powder with 30 um average diameter) suspending and mixing in the calciner and burning, take place the reaction with caco3->cao +co2, the case maybe like desulpher process in furnace of power station.
now we want to know: as for the kiln burning, which option (icp3pl/icpl3c) is better?
as for the calciner suspending burning, Is the CS suitable for the case which calculation the coal combustion coupled with caco3 decarbonation? if it's ok, which option is better? and would you give some suggestions for it?
 
best regards
leo

Hi,
As commented in usppmo.f90 of Code_Saturne 2.0.0-rc2, it reads,
 

! --- cpl3c: Pulverized coal with Lagrangian reciprocal approach
! ==========
 
!        Not recently tested... at least outdated, may be obsolete

 
Maybe the cpl3c is not functional.
 
Would someone give suggestions about the coupling phenomenon of coal combustion and limestone decarbonation as in power station furnace. Is the cp3pl option suitable for the case?
 
Best regards,
Leo

Hi,
Generally, you should always use the icp3pl option (the Lagrangian one remains only for very particular purposes).

Dear Alexandre,
thanks your replying.
would you try "EBU" to model gas phase combustion with pulverized coal combustion model, whereas in icp3pl, the gas combustion model is Mixed-Is-Burn model.

In the kiln the standard simple (only one variance taken in account) model can be used. So you should use ICP3PL.  IPPMOD(ICP3PL)=0 or 1 if you want to take into account the coal moisture (drying). For the calciner, the capability of Code_Saturne to deal with some kinds of particles is tempting: ones can believe the decarbonation is close... but it releases CO2 (not CO) so the present model for gaz phase composition is not able to deal with. Some development are needed (at least introduce an extra mixture fraction). Some discussion and help is possible on this topic. In the calciner, the mass fraction of CO2 can be much larger than the O2 mass fraction; if reaction of CO2 with coal and char may be described, the use of the newest version (currently in progress for oxy-combustion modeling) is needed.
 
Regards

Hi Plion,
for the case in the calciner, the EBU model is suitable for the gas combustion model, maybe someone have experience for it.
 
best regards

Dear Plion,
thanks your reply. the scheme of case as following(the sheme should be rotated 90 degree clockwisely),
                                           r             c
__/ ---------------------| |------||---------\
                                                                            \__
outlet <--                                                                      <-- kiln gas 
                                                                            /--
``\---------------------| |-------||-|    |---/
                                           r'             c'  |    |
                                                                TA(tertiary air) ( hot air @ 900 c)
where, r and r' is raw meal (mainly limestone, 35um ) chutes to calciner, 
          c and c' is pulverised coal pneumatic transport pipe( pc+air @ 60 c )
          kiln gas is from kiln coal burning, (CO2-30%,O2-2%,N2,H2O,CO,NOx,...) @ 1100 c
For this case, would you give some help to introduce extra mixture fraction with mix-is-burn model?
best regards,