There are two methods used in silo demolition. The first one if space allows is to strategically remove the support of a silo on its one side so as to topple it in the desired direction.
The second method is to set up scaffolding inside and take it down from the top. This method is used for two reasons. One reason is when the materials will be salvaged and reused elsewhere. The other is when there are obstructions that prohibit it from being thrown down.