I need to make kind of like engine glows but I cant use halos in yafrey.any alternatives
Well, particles would be perfect for this, but Yafray does not support them, yet.
I think you are SOL for now. Unless you can make a nice alpha texture.
BgDM
How about you just render the flames by themselved in blender, then use gimp of photoshop to overlay it with the rendered yafray image.