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VSBK
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Kiln description
The design of the VSBK resembles of an intermittent
updraft kiln, yet represents new and unique method of continuous
firing brick. The VSBK kiln accomplishes a building like structure
with a life span of more than 15 years. Within a roofed and
buttressed (Optional) rectangular support building are two,
four or even six well insulated firing shafts, according to
the required production capacity needed. The shaft is rectangular
in cross-section with nominal size is 1 x 2m and approximately
5.5m in height. The inner side of the shaft is in refractory
bricks lining throughout the height. Accurate shape and size
of refractory bricks helps to maintain the verticality, of
the shaft, apart from being an excellent heat resistance material
that withstands fire. The gap between refractory shaft walls
and outer kiln walls is filled with insulating materials –
broken brickbats, rubbish, and burnt coal ash. The shafts
are open at top and bottom. At the base of each shaft is an
arched unloading tunnel, which runs through the center of
the kiln. It allows access to both sides of the base of the
firing shaft and contains unloading equipments. Provisions
for peep holes for thermocouples are provided along the shaft
height to monitor the position of the fire as well as the
temperature profile of the kiln.
The shaft is loaded from the top with the
total of 12 batches of green bricks plus coal for firing.
Each batch typically contains four layers of bricks, set in
a predetermined pattern. The stacks of bricks rest on I-bars
(which can be removed or inserted), supported in turn by a
pair of horizontal I-beams across the arches in the unloading
tunnel. For evacuation of exhaust gases, typically two circular
metal chimneys are provided at opposite corners of each shaft.
A lid cover is provided to cover the shaft top, which directs
the exhaust gases to the chimney through the flue duct system.
Principle
of the VSBK firing
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