Low-smoke carbon furnace

A low-smoke carbon furnace comprising:

• an outer casing;
• a removable liner disposed in the outer casing, wherein the removable liner is provided with a combustion chamber therewithin, and wherein the removable liner comprises a plurality of secondary air inlets disposed on an upper side wall of the removable liner;
• an annular interlayer disposed between the outer casing and the removable liner, wherein a bottom end of the outer casing is provided with interlayer air inlets configured to communicate with the annular interlayer, and wherein oxygen enters the annular interlayer via the interlayer air inlets, and thereafter enters the combustion chamber of the removable liner via the plurality of secondary air inlets to facilitate secondary combustion in the combustion chamber;
• a waterproof cover disposed on a top end of the outer casing;
• and
• a fire concentrating ring disposed between the top end of the outer casing and the waterproof cover, wherein an outer diameter of the fire concentrating ring is larger than an outer diameter of the outer casing, and wherein an inner diameter of the fire concentrating ring is smaller than an inner diameter of the removable liner.