Flame tube tubulation type direct heating furnace

The utility model relates to a combustion device using fluid fuels, and solves the problems of the existing heating furnace used for the gathering and transferring process of oil-gas in oilfields, such as low temperature corrosion, large consumption, not high enough heat efficiency, etc. A directly heating furnace of a fire cylinder and tube array type is composed of a chimney, a smoke pipe, a furnace casing, the fire cylinder, a burner, etc., and is characterized in that the fire cylinder in a radiation section is arranged inside with the tube array; a smoke tube serves as a convection section which is made of fine steel tubes and which is arranged inside with intubation tubes. The utility model can raise the radiation interchange intensity by 3-5 times, intensify the convection heat transfer, exceed a tube heating furnace, or a fire cylinder heating furnace or even a fire / water convection heating furnace, and be widely used for the oilfields.