Method and apparatus for partial combustion of coal.

摘要

A first-stage furnace (10) for partial combustion of solid fuel and oxidizer gas to generate inflammable exhaust gases which are passed to a secondary-stage furnace (17) is shown. The first-stage furnace (10) comprises a vertical cylindrical pre-combustion chamber (1) and a cylindrical main combustion chamber (2) mounted in horizontal position. The air-fuel mixture introduced into the pre-combustion chamber (1) is given a swirling motion and burned at a temperature that converts the mixture to a mixture of incompletely burned fuel particles, exhaust gases and non-combustible products in molten state. The mixture flows through a tangential passage (2c) into the main combustion chamber (2) and develops into a high-velocity vortex, with the molten slag being centrifuged onto the inner wall (2b) of the main combustion chamber (2) to form a film which is removed through a tapping port (6). Thus, the generated inflammable gases are free from non-combustible products such as ash, and conveyed to the secondary-stage furnace (17), through a duct (12).