Abstract: The working principle of a new separated type heat pipe using the gap of canular structure as the evaporation and condensation space was introduced in the paper. The heat transfer process and enhancement both in evaporator and condenser sections of the heat pipe were analyzed. This new type heat pipe was applied in a puddling process. The waste flue gas from the hot blast stove was used as the hot source to heat the cold mixture of compressed air and coal powder. The observed practical performance of the heat pipe showed a good agreement with the design expectation, which verified feasibility of using the separated type heat pipe for the heat transfer of the solid powder.