Combustion furnace

A combustion furnace, comprising:

• an inner shell, defining a receiving cavity therein, the inner shell defining a plurality of first gas holes around the periphery of a top portion thereof, the inner shell defining a gas inlet hole at a bottom portion thereof;
• an outer shell, enclosing the inner shell such that a gas flowing space is defined between the inner shell and the outer shell;
• a gas inlet piping having an opening formed at one end thereof and the gas inlet piping communicating with the gas flowing space;
• a flame inhibiting cover including a conical portion and a cylindrical portion extending downwardly from the conical portion, a lower edge of the cylindrical portion being disposed below the first gas holes;
• and
• a combustion supporting device disposed in the receiving cavity and above the gas inlet hole, the combustion supporting device comprising:
• a tubular member;
• a cone-shaped member, defining an inserting groove therein, a bottom of the tubular member received in the inserting groove;
• and
• a base portion, connected to a bottom of the cone-shaped member,
• wherein a powdered ceramic material is placed into a space defined by an outer surface of the lower portion of the tubular member and an inner wall of the cone-shaped member to maintain the temperature of the combustion furnace;
• wherein a flame stopping plate encloses and is in direct contact with an outer surface of the cylindrical portion for preventing a flame coming out from the receiving cavity.