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PULVERIZED COAL-FIRED BOILER
Pulverized Coal-fired Boiler
A single-drum natural circulation type, inverse U-form, arranged and pulverized
coal-fired with dry bottom. It is of full steel structure, in-door or out-door
installation. The furnace is top supported and the back pass is bottom supported.
Membrane walls are used both in the furnace covering a cross section dimension, and
in the roof pass of superheater zone. The boiler is full gas tight.
There is a cyclone separator and feed water washing device inside the drum. Behind
the furnace outlet, a high-temperature superheater and lower-temperature superheater
are arranged in turn on the horizontal pass. The whole furnace, the horizontal pass
and the corning gas chamber are top supported, expanding from the top to the bottom
freely. The two-stage economizers and air preheaters are supported by steel structure.
The related discrepancy arising from the subsequent expansion is compensated by the
expand-joint.
Base on transferred technology, wide range pulverized-coal tangential firing burners
are arranged at the four corners of the furnace. These burners have good suitability
to great variety of coals and good stability for low-load burning. Additionally, the
burner is well protected by water-cooled sleeve structure.
The superheater steam temperature is adjusted by a water-spray-desuperheater.
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