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 external walls of the entire 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,
• wherein the entire primary combustion chamber is arranged at an upper portion of inside the secondary combustion chamber,
• wherein the primary combustion chamber is configured to have at a distance from a bottom surface of the secondary combustion chamber and to expose an entire bottom external wall of the primary combustion chamber inside the secondary combustion chamber,
• wherein the combustion gas outlet of the primary combustion chamber is configured to face a first side wall of the secondary combustion chamber, and a combustion gas outlet of the secondary combustion chamber is formed on a second side wall of the secondary combustion chamber opposite to the first side wall so that the secondary combustion gas comes into contact with and flows along the external walls of the entire primary combustion chamber.