It combines water tube and fire tube designs for optimized steam generation, in addition to a conveyor grate.
The rotary grate is made of heat-resistant special alloy casting material.
When it comes to the chain links, they are designed to create thin air
outlets between them in order to provide combustion on the entire surface.
The combustion capacity can be kept at the desired level by supplying the
required amount of combustion air to the grate from below through numerous
air channels and adjustment valves.
The most suitable coal that the rotary grate should use is whose volatile
matter should account for at least 35% and has the size of a grain of rice
which is approximately between 3 to 10 mm.
From the moment the coal is poured into the grate from the loading bunker, it
moves into the furnace with the rotation speed of the grate. The coal layer laid
on the grate is adjusted by a manual mechanism depending on the quality
of the coal, the burning speed, etc. When it first enters the furnace, the coal
first begins to release its moisture under the influence of radiation heat and
then gasify as the temperature increases. From that, volatile-flammable
hydrocarbons are release, and the coal completes the combustion of fixed
carbon in the further parts of the grate.
