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Vertical shaft brick kiln firing services |
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Current
technologies for brick production such as clamps, down draught kilns and
Bull’s trench kilns consume large quantities of fuel such as coal,
firewood and other biomass. The devastating effect of the pollution caused
by huge amount of emissions from the brick industry has attracted the
attention of regulatory agencies who have issued deadlines after which the
polluting kilns are "to clean up or close down". Vertical Shaft
Brick kiln technology is an energy efficient, environment friendly and
economically viable means to produce quality bricks.
BRIEF
FIRING PROCESS
During operation, one batch of dried green bricks is loaded at the top at a
time. A weighed quantity of
specific size coal is spread on each layer
uniformly to fill the gaps. The brick unloading is done from the bottom
using a trolley which runs on rails along the length of the unloading
tunnel. Lifting and lowering of the trolley is done using single screw
unloading mechanism. For unloading, the trolley is lifted so that the whole
stack of bricks in the shaft rests on it. The stack is then lowered till the
layer with openings appears, through which the support bars are reinserted.
On further lowering, the load of the stack is taken by the support bars
except for the batch being unloaded which comes down along with the trolley
which finally rests on a pair of rails. The trolley is later pulled out
along the rails and the bricks subsequently unloaded. The frequency of
unloading – loading varies from 90 to 150 minutes.
FIRING PRINCIPLE
The skill in operation is to keep the firing zone in the middle of the
shaft. The draught of air moving up from the bottom cools the fired bricks
in the cooling zone and itself gets heated. Maximum temperatures of up to
10000C are attained in the central firing zone. The hot gasses
moving upwards dry and heat up the green bricks in the preheating zone. This
recovery of sensible heat, accounts for the high energy efficiency of the
VSBK technology.
AREAS OF
APPLICATION
Firing of regular and matrix size bricks and also brick tiles.
ADVANTAGES
| ● | High energy efficiency and less polluting emissions |
| ● | Better quality bricks compared to clamps |
| ● | Round the year operation, subject to availability of green bricks |
| ● | Flexibility in volume of production |
| ● | Highly suitable where part of fuel is traditionally mixed with clay |
| ● | Minimal maintenance requirements |
DEVELOPMENT
STATUS
Fully commercialized
TECHNICAL
DATA
Different shaft size can produce bricks ranging from 2500 to 5500 per day
per shaft
| Shaft size | Production/day/shaft |
| 1.0 m x 1.0 m | 2500 |
| 1.0 m x 1.5 m | 3500 |
| 1.0 m x 2.0 m | 5000 |
| 1.25 m x 1.75 m | 5500 |
External fuel consumption ranging between 5 to 8 tonnes per lakh bricks
ECONOMIC
DATA
Two shafts of any size can be operated by 8 – 12 workers easily. Firing
costs varies between Rs. 70 to Rs. 90 per thousand depending on the
expertise of firing team.
BUSINESS
VSBK Service Centre has a group of trained fire masters and engineers. They
are fully capable of handling any type of critical firing situations.
TRANSFER
FORM
Process and turn key basis.
VSBK firing initialization and stabilization charges are Rs. 5,000 per
shaft.
ADDRESS OF
CORRESPONDANCE
| Dr.
Soumen Maity / Rajesh
BajpaiTechnology System Branch Development Alternatives 1077, Civil Lines Jhansi – 284 001 Telefax : 91+ 517+
452340 |
Mr.
Subroto Roy Senior Business Development Executive Development Alternatives B-32, TARA Crescent Qutab Institutional Area New Delhi – 110016 Tel : 91+ 11+
696-7938, 685-1158 |