After my necro-conjurer ressurect any body, ash pile don't disapear in time. Creatures are respawn in that places and may be piecefull. May I click on the ash piles and type in console "disable"? Will leveled creatures broken after it?

Disabling an ash pile won't break anything.

I'd also recommend including this command:

MarkForDelete

after disabling the piles, as this will permanently remove that ash pile from the game (including from your save).

1. Click on pile
2. Type MarkForDelete in console
3. Repeat it for other piles
4. Disable in console

Am I right?

Shouldn't need the last step. MarkForDelete should do it nicely. If you markfordelete and immediately save and reload, the ash piles would be gone