Combustion system and prediction device

A combustion system comprising:

• a fuel storage configured to store solid fuel;
• a supply device connected to the fuel storage;
• a combustion device configured to combust the solid fuel;
• and
• a prediction device configured to predict a switching time of a type of the solid fuel supplied from the fuel storage to the combustion device via the supply device,
• wherein the prediction device comprises at least one processor configured to:
• acquire a level of the solid fuel stored in the fuel storage;
• predict a future time as the switching time, the future time being a time when an extrapolated level for the switching time reaches a threshold value and the extrapolated level for the switching time being an extrapolated level of a time-dependent change in terms of a decrease in the level of the solid fuel when predicting the switching time;
• and
• display the switching time on a display device.