Those who are interested to set up a auto bricks the can get idea about this slide.

1. Hoffmann kiln
The Hoffmann kiln is a series of batch process kilns.
Hoffmann kilns are the most common kiln used in production of bricks and
some other ceramic products.
Patented by German Friedrich Hoffmann for brick making in 1858

2. Disadvantages of Hoffmann kilns
•They have a large mass that absorbs a lot of heat as the firing zone moves forward through the cold
kiln.This is compensated
by the fact that some of the residual heat in the kiln and fired bricks is used to pre-heat the air for
combustion.
•They are expensive to build and require regular maintenance. Some models are large and
complicated structures with
very intricate systems of flues and dampers.
•They occupy a lot of space; because of this they are often built in the clay pit after all the usable clay
has been extracted,
so as not to occupy large areas of clay reserves.
• Direct stoking affects the quality of the bricks directly beneath the stoke holes.These bricks can be
over-fired and are
usually discoloured.This can be avoided by incorporating firing trenches beneath the stoking holes,
along the sides
and in the centre of the firing chamber.These trenches contain burning fuel and prevent localised brick
spoilage in the kiln.
The fitting of firing trenches, however, means that the capacity of the kiln is reduced to produce a
higher quantity of evenly
fired bricks.

3. Advantages of Hoffmann kilns
•They are fuel efficient because of the direct stoking into the bricks and their use of waste heat to dry
and preheat the green
bricks before firing. Efficiency figures for Hoffmann kilns using coal as a fuel, in England and China,
range from 1,800
at best to 2,350 kJ per kg fired brick at worst.
•They have the capacity to fire very large quantities of bricks evenly and with minimal wastage.
•The use of the down or cross draught system, with the fuel being burnt at regular intervals amongst
the bricks, provides an
even firing throughout the kiln.
•The firing is controllable by the use of the dampers and careful stoking. A variety of biomass fuels
can be used successfully,
for example, sawdust and wood processing waste, rice and coffee husk.These fuels can be added
through the roof of the kiln
with the use of mechanised fuel charging hoppers that run on compressed air or electricity.This is
necessary when burning
the biomas fuels that have a higher mass and lower calorific value than other fuels, like coal or coke.

7. BOX FEEDER

8. ROLLER CRUSHER

9. Hammer Crusher

10. Mixer

11. Brick Making Machine

12. Brick Cutting Machine