The invention relates to a top
combustion type hot air furnace arranging an annular flameless
combustion device below an arch roof of a
combustion chamber, which is used for solving the problems of low mixing rate of
coal gas and air and low combustion intensity. The structure is as follows: a wall body of the
combustion chamber is shaped like the spherical arch roof, a combustion-supporting
ceramic porous body is arranged in the wall body of the
combustion chamber, the wall body of the
combustion chamber and the wall body of a
combustor at the lower part are connected into a whole, a
coal gas inlet
pipe and an air inlet
pipe on the wall body of the
combustor are built on a
coal gas distribution ring path and an air distribution ring path, a pre-
mixed gas spout is arranged at the upper part of a
coal gas and air pre-mixing ring path, and a gas flow blocking ring is arranged above the pre-
mixed gas spout; and a hot air outlet
pipe is arranged on the wall body of the
combustor, the inner side of a lower cylindrical body and the outer side of an inner-layer cylindrical wall body at the upper part of the wall body of a heat accumulation chamber are mutually sheathed and connected in a slippage manner via a ladder joint type labyrinth hermetic connection structure, a porous heat accumulation body is arranged in the heat accumulation chamber, a
cold air chamber is constituted between the wall body of the heat accumulation chamber at the lower part of a furnace grate and the bottom of the furnace, and a
flue gas outlet pipe and a
cold air inlet pipe are arranged on the wall body of a
cold air chamber. The top combustion type hot air furnace provided by the invention can save fuel and reduce the temperature of
waste gas and the emission of harmful gas.