Hi, sorry for the delay. This thread slipped through the cracks...
I've looked at your file now...this seems to be an Arnold bug. It's not querying tyFlow particles with the proper interface flag so tyFlow is returning all particles regardless of whether or not they're supposed to be renderable. Because Arnold is forcibly retrieving the wrong interface from the tyFlow object, you can't even use a trick like putting a mesh modifier on top of the tyFlow in order to override its particles and convert it to an editable mesh for rendering.
Luckily there is a simple workaround in your case:
Create a tyMesher object, set mode to "Input Geometry", disable "force particle interface" and then select your tyFlow object. The tyFlow will pass only its actor meshes to the tyMesher, and Arnold won't override the tyMesher output with the particle data.
I've looked at your file now...this seems to be an Arnold bug. It's not querying tyFlow particles with the proper interface flag so tyFlow is returning all particles regardless of whether or not they're supposed to be renderable. Because Arnold is forcibly retrieving the wrong interface from the tyFlow object, you can't even use a trick like putting a mesh modifier on top of the tyFlow in order to override its particles and convert it to an editable mesh for rendering.
Luckily there is a simple workaround in your case:
Create a tyMesher object, set mode to "Input Geometry", disable "force particle interface" and then select your tyFlow object. The tyFlow will pass only its actor meshes to the tyMesher, and Arnold won't override the tyMesher output with the particle data.