Combustor for various types of solid fuels

A solid fuel combustion device comprising:

• a fuel supply device including a firewood feed pipe or another fuel supplier;
• a primary combustion chamber coupled to the fuel supply device, wherein a combustion gas outlet formed in one side surface or at a lower side of the primary combustion chamber and the remaining surfaces thereof are blocked by a wall formed of a fireproof material so that primary combustion is performed;
• a secondary combustion chamber including a wall formed of a fireproof material and having a structure in which a space is formed at a side of the combustion gas outlet of the primary combustion chamber to induce primary combustion gas to be secondarily expanded and combusted, a flow direction of secondary combustion gas is switched after the expansion and combustion to form a path such that the secondary combustion gas comes into contact with and flows along at least one of a lower external wall and a side surface wall of the primary combustion chamber and intensively transfers secondary combustion heat to a fuel in a combustion region of the primary combustion chamber by conduction and radiation;
• and
• an air supply system including at least one air supply device in an entire combustion path formed in the primary combustion chamber and the secondary combustion chamber.