Spraying Urea solution in SCR
 

Hi

Can anybody help me regarding Spraying Urea in Catalyst. I putted all the parameters but unable to put injector in SCR Can you suggest how to put injector, because error says that I have not placed any injector.

Do we need to create injector in geometry itself or we can choose it after meshing. I want to put injector at different places in side the pipe. I know the other parameters of injector.

Thanks

From Lokesh

Re: Spraying Urea solution in SCR
 

Hi
you can put your injector where you want, just specify what type of numerical procedure you want to use (lagrangian I suppose). Then with the Star-Gui in Lagrangian Multiphase->Droplet Control you can specify if you are simulating a spray injection with atomization or a explicit defined parcel inj.
You don't need to model all the injector geometry: you must define a csys for your injector and place that csys where you want to put the orifice of your injector, in your model. Then in Star Gui->Spray Injection and Atomization (if you choose this option) you must use the csys that you have just defined above.
Hope that help!
Regards

Re: Spraying Urea solution in SCR
 

Hi Andrea

I got you, but could you please suggest me how to use csys I used the command says enter ic(1). mesh> then what to do with that

Thanks a lot

From Lokesh

Re: Spraying Urea solution in SCR
 

Hi Lokesh,

csys is available at the left-bottom corner of PROSTAR mail window, that will display all co-ordinate systems available in your model. there you can define your own location for coordinate system(ie point where you want to inject)as local co-orinate system. and directly specify this co-ordinate system number in defining parameters for injector in Lagrangian multiphase in star-guide. I am also working o similar problem, I want your help in this regard, can u please help in getting properties of urea and HNCO. And can you tell me if you have any data regarding urea decomposition and hydrolysis. thank you.

Re: Spraying Urea solution in SCR
 

Using the csys command it's simple:
you can use the GUI Panel on the left of the screen or the text command as (for example) loca,23,cyli,1,0.023,-0.6,0,0,106 where I define the csys23 as local, cylindrical, etc.(you can find info about that command in the help box).
For spray injection the liquid is injected following the z-axis of the csys you want to use, so keep it in mind when you define your coord. system.
For pullaiah, sorry but I have no info about Urea and HNCO...I think that you need to look at some special chem site or archive.
Regards,
Andrea

Re: Spraying Urea solution in SCR
 

Hi thanks for help

I am also searching for that. My source is tech papers. If I am able to find them I will post you as soon as possible

Thanks

Bye

Re: Spraying Urea solution in SCR
 

Hi

check this paper 2004-01-1944 SAE paper for urea solution properties.