A Zigzag Kiln (a Natural Draught Zigzag Kiln (NDZK) or an Induced Draught Zigzag Kiln (IDZK)) consists of:
The construction quality of these components has to be good for the efficient functioning of a kiln. In this Knowledge Brief, the good practices for the construction of the flue gas ducts and miyana of a Zigzag Kiln (NDZK or IDZK) are discussed. The good practices for the construction of a masonry chimney of an NDZK or an IDZK, and the outer wall and wicket gates are discussed in other Knowledge Briefs.
Flue ducts are used to convey hot gases from the kiln to the chimney. The walls of the ducts (and miyana) must be designed and constructed to minimise air leakage, and to withstand expansion and contraction of the brick walls (due to heating or cooling of brick walls).
The good practices for constructing the flue gas ducts are as given below.
The good practices for constructing the miyana are as given below.