Nobody was injured as the 53m (170’) silo at Vordingborg Harbour fell, but it damaged a small section of an adjacent library.
The operation was witnessed by hundreds.
The blast had been prepared for six months and an investigation has begun into what went wrong.
Vordingborg’s mayor, Mikael Smed, told the Ritzau news agency that dust and glass would need to be cleared up from the damaged area.
In addition, a structural assessment of the damaged library building would be carried out.