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New type gypsum frying boiler:
The largest advantage of this machine is energy-saving. The reason lies in its feature "first grind and second bake". Large plaster stone will be grinded into less than 0.2mm size which increases the specific contact surface with heat media, improves calcination heat conducting exchange efficiency and lowers energy-consumption greatly.
Analysis on technique features:
I. Concept of technique
Crusher grinds large gypsum into small granules less than 25mm. After storage and measurement with weigh belt, transfer them
into Raymond mill for milling. Transfer qualified calcined gypsum powder to clinker bin for storage or to board-manufacturing workshop for usage.
II.Operating mode of ebullience calciner:
The bed state of gypsum ebullience calciner belongs to bubbling bed so this calciner is called “ebullience calciner”. The calcining
part of the ebullience calciner is a standing box-type container with a gas distribution board at the bottom for the purpose of supporting solid powder materials to avoid leakage when
stopping running and having the gas from the bottom into lathe evenly during running. Continuous feeding batch feeder is equipped
above the upper bound of the bed. There are overflow holes on the furnace wall of the upper bound of the bed, which is used for
discharging materials. Many heating pipes are equipped within the beds and the heating media within the pipes are saturated steam
or heat oil; the heat is transferred through pipe walls to fluidized gypsum powder outside of the pipe and makes the gypsum powder
dehydrate and decompose. One electrical precipitator is equipped on the upper calcination section and the dust brought by gas when
leaving fluidized bed shall be collected by the electrical precipitator and return to fluidized bed automatically. The dusted tail gas shall
be extracted by extract blower into the air. During normal operation, blast air from the bottom of ebullience calciner and enter into fluidized
bed through the gas distribution board. Then the heat pipe flooded within the fluidized bed shall transfer a large amount of heat to materials
and have the dehydrate gypsum powders reach the temperature of dehydration and decomposition. The dehydrate gypsum shall dehydrate c
rystal water in fluidized bed and become steam. The steam mixes with the blasted air at the bottom of ebullience calciner and they move
upward through bed. Since the steam is much more than air, the fluidization of the whole bubbling bed is realized by the steam formed from
gypsum dehydration. Due to violent tumbling and mixing of powder materials in the fluidized bed, the temperature and components of the
materials at all positions of the whole fluidized bed are almost the same. The raw gypsum powder added continuously, once entering the b
ed, shall immediately mix with the hot powder materials within the bed evenly and quickly dehydrate and decompose in the hot powder. In
order to avoid that the raw gypsum is extracted too early before finishing dehydration, the furnace is designed to add a separator to divide
the fluidized bed into a large and a small sections. The bottoms of two sections are connected. Raw gypsum enters into the large section
firstly and dehydrates most of crystal water; then comes to the small section through the lower part of the passage and completes the final
dehydration and overflow the furnace from upper bed automatically.
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